* [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Here's stabilized version of my patchset which intended to bring huge pages
to ext4.
The basics are the same as with tmpfs[1] which is in Linus' tree now and
ext4 built on top of it. The main difference is that we need to handle
read out from and write-back to backing storage.
Head page links buffers for whole huge page. Dirty/writeback tracking
happens on per-hugepage level.
We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
huge pagecache enabled.
On split_huge_page() we need to free buffers before splitting the page.
Page buffers takes additional pin on the page and can be a vector to mess
with the page during split. We want to avoid this.
If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
Readahead doesn't play with huge pages well: 128k max readahead window,
assumption on page size, PageReadahead() to track hit/miss. I've got it
to allocate huge pages, but it doesn't provide any readahead as such.
I don't know how to do this right. It's not clear at this point if we
really need readahead with huge pages. I guess it's good enough for now.
Shadow entries ignored on allocation -- recently evicted page is not
promoted to active list. Not sure if current workingset logic is adequate
for huge pages. On eviction, we split the huge page and setup 4k shadow
entries as usual.
Unlike tmpfs, ext4 makes use of tags in radix-tree. The approach I used
for tmpfs -- 512 entries in radix-tree per-hugepages -- doesn't work well
if we want to have coherent view on tags. So the first 8 patches of the
patchset converts tmpfs to use multi-order entries in radix-tree.
The same infrastructure used for ext4.
Encryption doesn't handle huge pages yet. To avoid regressions we just
disable huge pages for the inode if it has EXT4_INODE_ENCRYPT.
With this version I don't see any xfstests regressions with huge pages enabled.
Patch with new configurations for xfstests-bld is below.
Tested with 4k, 1k, encryption and bigalloc. All with and without
huge=always. I think it's reasonable coverage.
The patchset is also in git:
git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v2
Please review and consider applying.
[1] http://lkml.kernel.org/r/1465222029-45942-1-git-send-email-kirill.shutemov@linux.intel.com
TODO:
- readahead ?;
- wire up madvise()/fadvise();
- encryption with huge pages;
- reclaim of file huge pages can be optimized -- split_huge_page() is not
required for pages with backing storage;
Kirill A. Shutemov (34):
mm, shmem: swich huge tmpfs to multi-order radix-tree entries
Revert "radix-tree: implement radix_tree_maybe_preload_order()"
page-flags: relax page flag policy for few flags
mm, rmap: account file thp pages
thp: try to free page's buffers before attempt split
thp: handle write-protection faults for file THP
truncate: make sure invalidate_mapping_pages() can discard huge pages
filemap: allocate huge page in page_cache_read(), if allowed
filemap: handle huge pages in do_generic_file_read()
filemap: allocate huge page in pagecache_get_page(), if allowed
filemap: handle huge pages in filemap_fdatawait_range()
HACK: readahead: alloc huge pages, if allowed
block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
mm: make write_cache_pages() work on huge pages
thp: introduce hpage_size() and hpage_mask()
thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask}
fs: make block_read_full_page() be able to read huge page
fs: make block_write_{begin,end}() be able to handle huge pages
fs: make block_page_mkwrite() aware about huge pages
truncate: make truncate_inode_pages_range() aware about huge pages
truncate: make invalidate_inode_pages2_range() aware about huge pages
ext4: make ext4_mpage_readpages() hugepage-aware
ext4: make ext4_writepage() work on huge pages
ext4: handle huge pages in ext4_page_mkwrite()
ext4: handle huge pages in __ext4_block_zero_page_range()
ext4: make ext4_block_write_begin() aware about huge pages
ext4: handle huge pages in ext4_da_write_end()
ext4: make ext4_da_page_release_reservation() aware about huge pages
ext4: handle writeback with huge pages
ext4: make EXT4_IOC_MOVE_EXT work with huge pages
ext4: fix SEEK_DATA/SEEK_HOLE for huge pages
ext4: make fallocate() operations work with huge pages
mm, fs, ext4: expand use of page_mapping() and page_to_pgoff()
ext4, vfs: add huge= mount option
Matthew Wilcox (6):
tools: Add WARN_ON_ONCE
radix tree test suite: Allow GFP_ATOMIC allocations to fail
radix-tree: Add radix_tree_join
radix-tree: Add radix_tree_split
radix-tree: Add radix_tree_split_preload()
radix-tree: Handle multiorder entries being deleted by
replace_clear_tags
Naoya Horiguchi (1):
mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries
drivers/base/node.c | 6 +
fs/buffer.c | 89 +++---
fs/ext4/ext4.h | 5 +
fs/ext4/extents.c | 10 +-
fs/ext4/file.c | 18 +-
fs/ext4/inode.c | 159 ++++++----
fs/ext4/move_extent.c | 12 +-
fs/ext4/page-io.c | 11 +-
fs/ext4/readpage.c | 38 ++-
fs/ext4/super.c | 26 ++
fs/hugetlbfs/inode.c | 22 +-
fs/proc/meminfo.c | 4 +
fs/proc/task_mmu.c | 5 +-
include/linux/bio.h | 4 +
include/linux/buffer_head.h | 10 +-
include/linux/fs.h | 5 +
include/linux/huge_mm.h | 18 +-
include/linux/mm.h | 1 +
include/linux/mmzone.h | 2 +
include/linux/page-flags.h | 12 +-
include/linux/pagemap.h | 32 +-
include/linux/radix-tree.h | 10 +-
lib/radix-tree.c | 357 ++++++++++++++++-------
mm/filemap.c | 529 ++++++++++++++++++++++++----------
mm/huge_memory.c | 69 ++++-
mm/hugetlb.c | 19 +-
mm/khugepaged.c | 26 +-
mm/memory.c | 15 +-
mm/page-writeback.c | 19 +-
mm/page_alloc.c | 5 +
mm/readahead.c | 17 +-
mm/rmap.c | 12 +-
mm/shmem.c | 36 +--
mm/truncate.c | 138 +++++++--
mm/vmstat.c | 2 +
tools/include/asm/bug.h | 11 +
tools/testing/radix-tree/Makefile | 2 +-
tools/testing/radix-tree/linux.c | 7 +-
tools/testing/radix-tree/linux/bug.h | 2 +-
tools/testing/radix-tree/linux/gfp.h | 24 +-
tools/testing/radix-tree/linux/slab.h | 5 -
tools/testing/radix-tree/multiorder.c | 82 ++++++
tools/testing/radix-tree/test.h | 9 +
43 files changed, 1373 insertions(+), 512 deletions(-)
------8<------
>From f765119236c9963466cd39a1502653d8c1dde836 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Fri, 12 Aug 2016 19:44:30 +0300
Subject: [PATCH] Add few more configurations to test ext4 with huge pages
Four new configurations: huge_4k, huge_1k, huge_bigalloc, huge_encrypt.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
kvm-xfstests/config | 8 +++++---
kvm-xfstests/kvm-xfstests | 2 +-
.../test-appliance/files/root/fs/ext4/cfg/all.list | 4 ++++
.../test-appliance/files/root/fs/ext4/cfg/huge_1k | 6 ++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_4k | 6 ++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_bigalloc | 14 ++++++++++++++
.../files/root/fs/ext4/cfg/huge_bigalloc.exclude | 7 +++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_encrypt | 5 +++++
.../files/root/fs/ext4/cfg/huge_encrypt.exclude | 16 ++++++++++++++++
kvm-xfstests/test-appliance/gen-image | 4 ++--
kvm-xfstests/util/parse_cli | 1 +
11 files changed, 67 insertions(+), 6 deletions(-)
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
diff --git a/kvm-xfstests/config b/kvm-xfstests/config
index e135f08872cb..11d513b71fbc 100644
--- a/kvm-xfstests/config
+++ b/kvm-xfstests/config
@@ -2,10 +2,12 @@
# Customize these or put new values in ~/.config/kvm-xfstests or config.custom
#
#QEMU=/usr/local/bin/qemu-system-x86_64
-QEMU=/usr/bin/kvm
-KERNEL=/u1/ext4/arch/x86/boot/bzImage
+#QEMU=/usr/bin/kvm
+QEMU=/home/kas/opt/qemu/bin/qemu-system-x86_64
+KERNEL=/home/kas/var/linus/arch/x86/boot/bzImage
NR_CPU=2
-MEM=2048
+MEM=16384
+#MEM=2048
CONFIG_DIR=$HOME/.config
PRIMARY_FSTYPE="ext4"
diff --git a/kvm-xfstests/kvm-xfstests b/kvm-xfstests/kvm-xfstests
index c7ac2b40cfb6..25e2c04c67d1 100755
--- a/kvm-xfstests/kvm-xfstests
+++ b/kvm-xfstests/kvm-xfstests
@@ -79,7 +79,7 @@ fi
chmod 400 "$VDH"
$NO_ACTION $IONICE $QEMU -boot order=c $NET \
- -machine type=pc,accel=kvm:tcg \
+ -machine type=q35,accel=kvm:tcg \
-drive file=$ROOT_FS,if=virtio$SNAPSHOT \
-drive file=$VDB,cache=none,if=virtio,format=raw \
-drive file=$VDC,cache=none,if=virtio,format=raw \
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
index 7ec37f4bafaa..14a8e72d2e6e 100644
--- a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
@@ -9,3 +9,7 @@ dioread_nolock
data_journal
bigalloc
bigalloc_1k
+huge_4k
+huge_1k
+huge_bigalloc
+huge_encrypt
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
new file mode 100644
index 000000000000..209c76a8a6c1
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
@@ -0,0 +1,6 @@
+export FS=ext4
+export TEST_DEV=$SM_TST_DEV
+export TEST_DIR=$SM_TST_MNT
+export MKFS_OPTIONS="-q -b 1024"
+export EXT_MOUNT_OPTIONS="huge=always"
+TESTNAME="Ext4 1k block with huge pages"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
new file mode 100644
index 000000000000..bae901cb2bab
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
@@ -0,0 +1,6 @@
+export FS=ext4
+export TEST_DEV=$PRI_TST_DEV
+export TEST_DIR=$PRI_TST_MNT
+export MKFS_OPTIONS="-q"
+export EXT_MOUNT_OPTIONS="huge=always"
+TESTNAME="Ext4 4k block with huge pages"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
new file mode 100644
index 000000000000..b3d87562bce6
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
@@ -0,0 +1,14 @@
+SIZE=large
+export MKFS_OPTIONS="-O bigalloc"
+export EXT_MOUNT_OPTIONS="huge=always"
+
+# Until we can teach xfstests the difference between cluster size and
+# block size, avoid collapse_range, insert_range, and zero_range since
+# these will fail due the fact that these operations require
+# cluster-aligned ranges.
+export FSX_AVOID="-C -I -z"
+export FSSTRESS_AVOID="-f collapse=0 -f insert=0 -f zero=0"
+export XFS_IO_AVOID="fcollapse finsert zero"
+
+TESTNAME="Ext4 4k block w/bigalloc"
+
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
new file mode 100644
index 000000000000..bd779be99518
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
@@ -0,0 +1,7 @@
+# bigalloc does not support on-line defrag
+ext4/301
+ext4/302
+ext4/303
+ext4/304
+ext4/307
+ext4/308
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
new file mode 100644
index 000000000000..29f058ba937d
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
@@ -0,0 +1,5 @@
+SIZE=small
+export MKFS_OPTIONS=""
+export EXT_MOUNT_OPTIONS="test_dummy_encryption,huge=always"
+REQUIRE_FEATURE=encryption
+TESTNAME="Ext4 encryption"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
new file mode 100644
index 000000000000..b91cc58b5aa3
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
@@ -0,0 +1,16 @@
+ext4/004 # dump/restore doesn't handle quotas
+
+# encryption doesn't play well with quota
+generic/082
+generic/219
+generic/230
+generic/231
+generic/232
+generic/233
+generic/235
+generic/270
+
+# generic/204 tests ENOSPC handling; it doesn't correctly
+# anticipate the external extended attribute required when
+# using a 1k block size
+generic/204
diff --git a/kvm-xfstests/test-appliance/gen-image b/kvm-xfstests/test-appliance/gen-image
index 717166047cbf..62871af12e12 100755
--- a/kvm-xfstests/test-appliance/gen-image
+++ b/kvm-xfstests/test-appliance/gen-image
@@ -4,8 +4,8 @@
SAVE_ARGS=("$@")
-SUITE=jessie
-MIRROR=http://mirrors.kernel.org/debian
+SUITE=testing
+MIRROR="http://linux-ftp.fi.intel.com/pub/mirrors/debian"
DIR=$(pwd)
ROOTDIR=$DIR/rootdir
#ARCH="--arch=i386"
diff --git a/kvm-xfstests/util/parse_cli b/kvm-xfstests/util/parse_cli
index 83400ea71985..ba64ce5df016 100644
--- a/kvm-xfstests/util/parse_cli
+++ b/kvm-xfstests/util/parse_cli
@@ -36,6 +36,7 @@ print_help ()
echo "Common file system configurations are:"
echo " 4k 1k ext3 nojournal ext3conv metacsum dioread_nolock "
echo " data_journal bigalloc bigalloc_1k inline"
+ echo " huge_4k huge_1k huge_bigalloc huge_encrypt"
echo ""
echo "xfstest names have the form: ext4/NNN generic/NNN shared/NNN"
echo ""
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Here's stabilized version of my patchset which intended to bring huge pages
to ext4.
The basics are the same as with tmpfs[1] which is in Linus' tree now and
ext4 built on top of it. The main difference is that we need to handle
read out from and write-back to backing storage.
Head page links buffers for whole huge page. Dirty/writeback tracking
happens on per-hugepage level.
We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
huge pagecache enabled.
On split_huge_page() we need to free buffers before splitting the page.
Page buffers takes additional pin on the page and can be a vector to mess
with the page during split. We want to avoid this.
If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
Readahead doesn't play with huge pages well: 128k max readahead window,
assumption on page size, PageReadahead() to track hit/miss. I've got it
to allocate huge pages, but it doesn't provide any readahead as such.
I don't know how to do this right. It's not clear at this point if we
really need readahead with huge pages. I guess it's good enough for now.
Shadow entries ignored on allocation -- recently evicted page is not
promoted to active list. Not sure if current workingset logic is adequate
for huge pages. On eviction, we split the huge page and setup 4k shadow
entries as usual.
Unlike tmpfs, ext4 makes use of tags in radix-tree. The approach I used
for tmpfs -- 512 entries in radix-tree per-hugepages -- doesn't work well
if we want to have coherent view on tags. So the first 8 patches of the
patchset converts tmpfs to use multi-order entries in radix-tree.
The same infrastructure used for ext4.
Encryption doesn't handle huge pages yet. To avoid regressions we just
disable huge pages for the inode if it has EXT4_INODE_ENCRYPT.
With this version I don't see any xfstests regressions with huge pages enabled.
Patch with new configurations for xfstests-bld is below.
Tested with 4k, 1k, encryption and bigalloc. All with and without
huge=always. I think it's reasonable coverage.
The patchset is also in git:
git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v2
Please review and consider applying.
[1] http://lkml.kernel.org/r/1465222029-45942-1-git-send-email-kirill.shutemov@linux.intel.com
TODO:
- readahead ?;
- wire up madvise()/fadvise();
- encryption with huge pages;
- reclaim of file huge pages can be optimized -- split_huge_page() is not
required for pages with backing storage;
Kirill A. Shutemov (34):
mm, shmem: swich huge tmpfs to multi-order radix-tree entries
Revert "radix-tree: implement radix_tree_maybe_preload_order()"
page-flags: relax page flag policy for few flags
mm, rmap: account file thp pages
thp: try to free page's buffers before attempt split
thp: handle write-protection faults for file THP
truncate: make sure invalidate_mapping_pages() can discard huge pages
filemap: allocate huge page in page_cache_read(), if allowed
filemap: handle huge pages in do_generic_file_read()
filemap: allocate huge page in pagecache_get_page(), if allowed
filemap: handle huge pages in filemap_fdatawait_range()
HACK: readahead: alloc huge pages, if allowed
block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
mm: make write_cache_pages() work on huge pages
thp: introduce hpage_size() and hpage_mask()
thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask}
fs: make block_read_full_page() be able to read huge page
fs: make block_write_{begin,end}() be able to handle huge pages
fs: make block_page_mkwrite() aware about huge pages
truncate: make truncate_inode_pages_range() aware about huge pages
truncate: make invalidate_inode_pages2_range() aware about huge pages
ext4: make ext4_mpage_readpages() hugepage-aware
ext4: make ext4_writepage() work on huge pages
ext4: handle huge pages in ext4_page_mkwrite()
ext4: handle huge pages in __ext4_block_zero_page_range()
ext4: make ext4_block_write_begin() aware about huge pages
ext4: handle huge pages in ext4_da_write_end()
ext4: make ext4_da_page_release_reservation() aware about huge pages
ext4: handle writeback with huge pages
ext4: make EXT4_IOC_MOVE_EXT work with huge pages
ext4: fix SEEK_DATA/SEEK_HOLE for huge pages
ext4: make fallocate() operations work with huge pages
mm, fs, ext4: expand use of page_mapping() and page_to_pgoff()
ext4, vfs: add huge= mount option
Matthew Wilcox (6):
tools: Add WARN_ON_ONCE
radix tree test suite: Allow GFP_ATOMIC allocations to fail
radix-tree: Add radix_tree_join
radix-tree: Add radix_tree_split
radix-tree: Add radix_tree_split_preload()
radix-tree: Handle multiorder entries being deleted by
replace_clear_tags
Naoya Horiguchi (1):
mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries
drivers/base/node.c | 6 +
fs/buffer.c | 89 +++---
fs/ext4/ext4.h | 5 +
fs/ext4/extents.c | 10 +-
fs/ext4/file.c | 18 +-
fs/ext4/inode.c | 159 ++++++----
fs/ext4/move_extent.c | 12 +-
fs/ext4/page-io.c | 11 +-
fs/ext4/readpage.c | 38 ++-
fs/ext4/super.c | 26 ++
fs/hugetlbfs/inode.c | 22 +-
fs/proc/meminfo.c | 4 +
fs/proc/task_mmu.c | 5 +-
include/linux/bio.h | 4 +
include/linux/buffer_head.h | 10 +-
include/linux/fs.h | 5 +
include/linux/huge_mm.h | 18 +-
include/linux/mm.h | 1 +
include/linux/mmzone.h | 2 +
include/linux/page-flags.h | 12 +-
include/linux/pagemap.h | 32 +-
include/linux/radix-tree.h | 10 +-
lib/radix-tree.c | 357 ++++++++++++++++-------
mm/filemap.c | 529 ++++++++++++++++++++++++----------
mm/huge_memory.c | 69 ++++-
mm/hugetlb.c | 19 +-
mm/khugepaged.c | 26 +-
mm/memory.c | 15 +-
mm/page-writeback.c | 19 +-
mm/page_alloc.c | 5 +
mm/readahead.c | 17 +-
mm/rmap.c | 12 +-
mm/shmem.c | 36 +--
mm/truncate.c | 138 +++++++--
mm/vmstat.c | 2 +
tools/include/asm/bug.h | 11 +
tools/testing/radix-tree/Makefile | 2 +-
tools/testing/radix-tree/linux.c | 7 +-
tools/testing/radix-tree/linux/bug.h | 2 +-
tools/testing/radix-tree/linux/gfp.h | 24 +-
tools/testing/radix-tree/linux/slab.h | 5 -
tools/testing/radix-tree/multiorder.c | 82 ++++++
tools/testing/radix-tree/test.h | 9 +
43 files changed, 1373 insertions(+), 512 deletions(-)
------8<------
>From f765119236c9963466cd39a1502653d8c1dde836 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Fri, 12 Aug 2016 19:44:30 +0300
Subject: [PATCH] Add few more configurations to test ext4 with huge pages
Four new configurations: huge_4k, huge_1k, huge_bigalloc, huge_encrypt.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
kvm-xfstests/config | 8 +++++---
kvm-xfstests/kvm-xfstests | 2 +-
.../test-appliance/files/root/fs/ext4/cfg/all.list | 4 ++++
.../test-appliance/files/root/fs/ext4/cfg/huge_1k | 6 ++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_4k | 6 ++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_bigalloc | 14 ++++++++++++++
.../files/root/fs/ext4/cfg/huge_bigalloc.exclude | 7 +++++++
.../test-appliance/files/root/fs/ext4/cfg/huge_encrypt | 5 +++++
.../files/root/fs/ext4/cfg/huge_encrypt.exclude | 16 ++++++++++++++++
kvm-xfstests/test-appliance/gen-image | 4 ++--
kvm-xfstests/util/parse_cli | 1 +
11 files changed, 67 insertions(+), 6 deletions(-)
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
create mode 100644 kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
diff --git a/kvm-xfstests/config b/kvm-xfstests/config
index e135f08872cb..11d513b71fbc 100644
--- a/kvm-xfstests/config
+++ b/kvm-xfstests/config
@@ -2,10 +2,12 @@
# Customize these or put new values in ~/.config/kvm-xfstests or config.custom
#
#QEMU=/usr/local/bin/qemu-system-x86_64
-QEMU=/usr/bin/kvm
-KERNEL=/u1/ext4/arch/x86/boot/bzImage
+#QEMU=/usr/bin/kvm
+QEMU=/home/kas/opt/qemu/bin/qemu-system-x86_64
+KERNEL=/home/kas/var/linus/arch/x86/boot/bzImage
NR_CPU=2
-MEM=2048
+MEM=16384
+#MEM=2048
CONFIG_DIR=$HOME/.config
PRIMARY_FSTYPE="ext4"
diff --git a/kvm-xfstests/kvm-xfstests b/kvm-xfstests/kvm-xfstests
index c7ac2b40cfb6..25e2c04c67d1 100755
--- a/kvm-xfstests/kvm-xfstests
+++ b/kvm-xfstests/kvm-xfstests
@@ -79,7 +79,7 @@ fi
chmod 400 "$VDH"
$NO_ACTION $IONICE $QEMU -boot order=c $NET \
- -machine type=pc,accel=kvm:tcg \
+ -machine type=q35,accel=kvm:tcg \
-drive file=$ROOT_FS,if=virtio$SNAPSHOT \
-drive file=$VDB,cache=none,if=virtio,format=raw \
-drive file=$VDC,cache=none,if=virtio,format=raw \
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
index 7ec37f4bafaa..14a8e72d2e6e 100644
--- a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/all.list
@@ -9,3 +9,7 @@ dioread_nolock
data_journal
bigalloc
bigalloc_1k
+huge_4k
+huge_1k
+huge_bigalloc
+huge_encrypt
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
new file mode 100644
index 000000000000..209c76a8a6c1
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_1k
@@ -0,0 +1,6 @@
+export FS=ext4
+export TEST_DEV=$SM_TST_DEV
+export TEST_DIR=$SM_TST_MNT
+export MKFS_OPTIONS="-q -b 1024"
+export EXT_MOUNT_OPTIONS="huge=always"
+TESTNAME="Ext4 1k block with huge pages"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
new file mode 100644
index 000000000000..bae901cb2bab
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_4k
@@ -0,0 +1,6 @@
+export FS=ext4
+export TEST_DEV=$PRI_TST_DEV
+export TEST_DIR=$PRI_TST_MNT
+export MKFS_OPTIONS="-q"
+export EXT_MOUNT_OPTIONS="huge=always"
+TESTNAME="Ext4 4k block with huge pages"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
new file mode 100644
index 000000000000..b3d87562bce6
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc
@@ -0,0 +1,14 @@
+SIZE=large
+export MKFS_OPTIONS="-O bigalloc"
+export EXT_MOUNT_OPTIONS="huge=always"
+
+# Until we can teach xfstests the difference between cluster size and
+# block size, avoid collapse_range, insert_range, and zero_range since
+# these will fail due the fact that these operations require
+# cluster-aligned ranges.
+export FSX_AVOID="-C -I -z"
+export FSSTRESS_AVOID="-f collapse=0 -f insert=0 -f zero=0"
+export XFS_IO_AVOID="fcollapse finsert zero"
+
+TESTNAME="Ext4 4k block w/bigalloc"
+
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
new file mode 100644
index 000000000000..bd779be99518
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_bigalloc.exclude
@@ -0,0 +1,7 @@
+# bigalloc does not support on-line defrag
+ext4/301
+ext4/302
+ext4/303
+ext4/304
+ext4/307
+ext4/308
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
new file mode 100644
index 000000000000..29f058ba937d
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt
@@ -0,0 +1,5 @@
+SIZE=small
+export MKFS_OPTIONS=""
+export EXT_MOUNT_OPTIONS="test_dummy_encryption,huge=always"
+REQUIRE_FEATURE=encryption
+TESTNAME="Ext4 encryption"
diff --git a/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
new file mode 100644
index 000000000000..b91cc58b5aa3
--- /dev/null
+++ b/kvm-xfstests/test-appliance/files/root/fs/ext4/cfg/huge_encrypt.exclude
@@ -0,0 +1,16 @@
+ext4/004 # dump/restore doesn't handle quotas
+
+# encryption doesn't play well with quota
+generic/082
+generic/219
+generic/230
+generic/231
+generic/232
+generic/233
+generic/235
+generic/270
+
+# generic/204 tests ENOSPC handling; it doesn't correctly
+# anticipate the external extended attribute required when
+# using a 1k block size
+generic/204
diff --git a/kvm-xfstests/test-appliance/gen-image b/kvm-xfstests/test-appliance/gen-image
index 717166047cbf..62871af12e12 100755
--- a/kvm-xfstests/test-appliance/gen-image
+++ b/kvm-xfstests/test-appliance/gen-image
@@ -4,8 +4,8 @@
SAVE_ARGS=("$@")
-SUITE=jessie
-MIRROR=http://mirrors.kernel.org/debian
+SUITE=testing
+MIRROR="http://linux-ftp.fi.intel.com/pub/mirrors/debian"
DIR=$(pwd)
ROOTDIR=$DIR/rootdir
#ARCH="--arch=i386"
diff --git a/kvm-xfstests/util/parse_cli b/kvm-xfstests/util/parse_cli
index 83400ea71985..ba64ce5df016 100644
--- a/kvm-xfstests/util/parse_cli
+++ b/kvm-xfstests/util/parse_cli
@@ -36,6 +36,7 @@ print_help ()
echo "Common file system configurations are:"
echo " 4k 1k ext3 nojournal ext3conv metacsum dioread_nolock "
echo " data_journal bigalloc bigalloc_1k inline"
+ echo " huge_4k huge_1k huge_bigalloc huge_encrypt"
echo ""
echo "xfstest names have the form: ext4/NNN generic/NNN shared/NNN"
echo ""
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Here's stabilized version of my patchset which intended to bring huge pages
to ext4.
The basics are the same as with tmpfs[1] which is in Linus' tree now and
ext4 built on top of it. The main difference is that we need to handle
read out from and write-back to backing storage.
Head page links buffers for whole huge page. Dirty/writeback tracking
happens on per-hugepage level.
We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
huge pagecache enabled.
On split_huge_page() we need to free buffers before splitting the page.
Page buffers takes additional pin on the page and can be a vector to mess
with the page during split. We want to avoid this.
If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
Readahead doesn't play with huge pages well: 128k max readahead window,
assumption on page size, PageReadahead() to track hit/miss. I've got it
to allocate huge pages, but it doesn't provide any readahead as such.
I don't know how to do this right. It's not clear at this point if we
really need readahead with huge pages. I guess it's good enough for now.
Shadow entries ignored on allocation -- recently evicted page is not
promoted to active list. Not sure if current workingset logic is adequate
for huge pages. On eviction, we split the huge page and setup 4k shadow
entries as usual.
Unlike tmpfs, ext4 makes use of tags in radix-tree. The approach I used
for tmpfs -- 512 entries in radix-tree per-hugepages -- doesn't work well
if we want to have coherent view on tags. So the first 8 patches of the
patchset converts tmpfs to use multi-order entries in radix-tree.
The same infrastructure used for ext4.
Encryption doesn't handle huge pages yet. To avoid regressions we just
disable huge pages for the inode if it has EXT4_INODE_ENCRYPT.
With this version I don't see any xfstests regressions with huge pages enabled.
Patch with new configurations for xfstests-bld is below.
Tested with 4k, 1k, encryption and bigalloc. All with and without
huge=always. I think it's reasonable coverage.
The patchset is also in git:
git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v2
Please review and consider applying.
[1] http://lkml.kernel.org/r/1465222029-45942-1-git-send-email-kirill.shutemov@linux.intel.com
TODO:
- readahead ?;
- wire up madvise()/fadvise();
- encryption with huge pages;
- reclaim of file huge pages can be optimized -- split_huge_page() is not
required for pages with backing storage;
Kirill A. Shutemov (34):
mm, shmem: swich huge tmpfs to multi-order radix-tree entries
Revert "radix-tree: implement radix_tree_maybe_preload_order()"
page-flags: relax page flag policy for few flags
mm, rmap: account file thp pages
thp: try to free page's buffers before attempt split
thp: handle write-protection faults for file THP
truncate: make sure invalidate_mapping_pages() can discard huge pages
filemap: allocate huge page in page_cache_read(), if allowed
filemap: handle huge pages in do_generic_file_read()
filemap: allocate huge page in pagecache_get_page(), if allowed
filemap: handle huge pages in filemap_fdatawait_range()
HACK: readahead: alloc huge pages, if allowed
block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
mm: make write_cache_pages() work on huge pages
thp: introduce hpage_size() and hpage_mask()
thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask}
fs: make block_read_full_page() be able to read huge page
fs: make block_write_{begin,end}() be able to handle huge pages
fs: make block_page_mkwrite() aware about huge pages
truncate: make truncate_inode_pages_range() aware about huge pages
truncate: make invalidate_inode_pages2_range() aware about huge pages
ext4: make ext4_mpage_readpages() hugepage-aware
ext4: make ext4_writepage() work on huge pages
ext4: handle huge pages in ext4_page_mkwrite()
ext4: handle huge pages in __ext4_block_zero_page_range()
ext4: make ext4_block_write_begin() aware about huge pages
ext4: handle huge pages in ext4_da_write_end()
ext4: make ext4_da_page_release_reservation() aware about huge pages
ext4: handle writeback with huge pages
ext4: make EXT4_IOC_MOVE_EXT work with huge pages
ext4: fix SEEK_DATA/SEEK_HOLE for huge pages
ext4: make fallocate() operations work with huge pages
mm, fs, ext4: expand use of page_mapping() and page_to_pgoff()
ext4, vfs: add huge= mount option
Matthew Wilcox (6):
tools: Add WARN_ON_ONCE
radix tree test suite: Allow GFP_ATOMIC allocations to fail
radix-tree: Add radix_tree_join
radix-tree: Add radix_tree_split
radix-tree: Add radix_tree_split_preload()
radix-tree: Handle multiorder entries being deleted by
replace_clear_tags
Naoya Horiguchi (1):
mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries
drivers/base/node.c | 6 +
fs/buffer.c | 89 +++---
fs/ext4/ext4.h | 5 +
fs/ext4/extents.c | 10 +-
fs/ext4/file.c | 18 +-
fs/ext4/inode.c | 159 ++++++----
fs/ext4/move_extent.c | 12 +-
fs/ext4/page-io.c | 11 +-
fs/ext4/readpage.c | 38 ++-
fs/ext4/super.c | 26 ++
fs/hugetlbfs/inode.c | 22 +-
fs/proc/meminfo.c | 4 +
fs/proc/task_mmu.c | 5 +-
include/linux/bio.h | 4 +
include/linux/buffer_head.h | 10 +-
include/linux/fs.h | 5 +
include/linux/huge_mm.h | 18 +-
include/linux/mm.h | 1 +
include/linux/mmzone.h | 2 +
include/linux/page-flags.h | 12 +-
include/linux/pagemap.h | 32 +-
include/linux/radix-tree.h | 10 +-
lib/radix-tree.c | 357 ++++++++++++++++-------
mm/filemap.c | 529 ++++++++++++++++++++++++----------
mm/huge_memory.c | 69 ++++-
mm/hugetlb.c | 19 +-
mm/khugepaged.c | 26 +-
mm/memory.c | 15 +-
mm/page-writeback.c | 19 +-
mm/page_alloc.c | 5 +
mm/readahead.c | 17 +-
mm/rmap.c | 12 +-
mm/shmem.c | 36 +--
mm/truncate.c | 138 +++++++--
mm/vmstat.c | 2 +
tools/include/asm/bug.h | 11 +
tools/testing/radix-tree/Makefile | 2 +-
tools/testing/radix-tree/linux.c | 7 +-
tools/testing/radix-tree/linux/bug.h | 2 +-
tools/testing/radix-tree/linux/gfp.h | 24 +-
tools/testing/radix-tree/linux/slab.h | 5 -
tools/testing/radix-tree/multiorder.c | 82 ++++++
tools/testing/radix-tree/test.h | 9 +
43 files changed, 1373 insertions(+), 512 deletions(-)
------8<------
^ permalink raw reply [flat|nested] 92+ messages in thread
* [PATCHv2 01/41] tools: Add WARN_ON_ONCE
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
The radix tree uses its own buggy WARN_ON_ONCE. Replace it with the
definition from asm-generic/bug.h
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
tools/include/asm/bug.h | 11 +++++++++++
tools/testing/radix-tree/Makefile | 2 +-
tools/testing/radix-tree/linux/bug.h | 2 +-
3 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/tools/include/asm/bug.h b/tools/include/asm/bug.h
index 9e5f4846967f..beda1a884b50 100644
--- a/tools/include/asm/bug.h
+++ b/tools/include/asm/bug.h
@@ -12,6 +12,17 @@
unlikely(__ret_warn_on); \
})
+#define WARN_ON_ONCE(condition) ({ \
+ static int __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ __warned = true; \
+ WARN_ON(1); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#define WARN_ONCE(condition, format...) ({ \
static int __warned; \
int __ret_warn_once = !!(condition); \
diff --git a/tools/testing/radix-tree/Makefile b/tools/testing/radix-tree/Makefile
index 3b530467148e..20d8bb37017a 100644
--- a/tools/testing/radix-tree/Makefile
+++ b/tools/testing/radix-tree/Makefile
@@ -1,5 +1,5 @@
-CFLAGS += -I. -g -Wall -D_LGPL_SOURCE
+CFLAGS += -I. -I../../include -g -Wall -D_LGPL_SOURCE
LDFLAGS += -lpthread -lurcu
TARGETS = main
OFILES = main.o radix-tree.o linux.o test.o tag_check.o find_next_bit.o \
diff --git a/tools/testing/radix-tree/linux/bug.h b/tools/testing/radix-tree/linux/bug.h
index ccbe444977df..23b8ed52f8c8 100644
--- a/tools/testing/radix-tree/linux/bug.h
+++ b/tools/testing/radix-tree/linux/bug.h
@@ -1 +1 @@
-#define WARN_ON_ONCE(x) assert(x)
+#include "asm/bug.h"
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 01/41] tools: Add WARN_ON_ONCE
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
The radix tree uses its own buggy WARN_ON_ONCE. Replace it with the
definition from asm-generic/bug.h
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
tools/include/asm/bug.h | 11 +++++++++++
tools/testing/radix-tree/Makefile | 2 +-
tools/testing/radix-tree/linux/bug.h | 2 +-
3 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/tools/include/asm/bug.h b/tools/include/asm/bug.h
index 9e5f4846967f..beda1a884b50 100644
--- a/tools/include/asm/bug.h
+++ b/tools/include/asm/bug.h
@@ -12,6 +12,17 @@
unlikely(__ret_warn_on); \
})
+#define WARN_ON_ONCE(condition) ({ \
+ static int __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ __warned = true; \
+ WARN_ON(1); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#define WARN_ONCE(condition, format...) ({ \
static int __warned; \
int __ret_warn_once = !!(condition); \
diff --git a/tools/testing/radix-tree/Makefile b/tools/testing/radix-tree/Makefile
index 3b530467148e..20d8bb37017a 100644
--- a/tools/testing/radix-tree/Makefile
+++ b/tools/testing/radix-tree/Makefile
@@ -1,5 +1,5 @@
-CFLAGS += -I. -g -Wall -D_LGPL_SOURCE
+CFLAGS += -I. -I../../include -g -Wall -D_LGPL_SOURCE
LDFLAGS += -lpthread -lurcu
TARGETS = main
OFILES = main.o radix-tree.o linux.o test.o tag_check.o find_next_bit.o \
diff --git a/tools/testing/radix-tree/linux/bug.h b/tools/testing/radix-tree/linux/bug.h
index ccbe444977df..23b8ed52f8c8 100644
--- a/tools/testing/radix-tree/linux/bug.h
+++ b/tools/testing/radix-tree/linux/bug.h
@@ -1 +1 @@
-#define WARN_ON_ONCE(x) assert(x)
+#include "asm/bug.h"
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 02/41] radix tree test suite: Allow GFP_ATOMIC allocations to fail
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
In order to test the preload code, it is necessary to fail GFP_ATOMIC
allocations, which requires defining GFP_KERNEL and GFP_ATOMIC properly.
Remove the obsolete __GFP_WAIT and copy the definitions of the __GFP
flags which are used from the kernel include files. We also need the
real definition of gfpflags_allow_blocking() to persuade the radix tree
to actually use its preallocated nodes.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
tools/testing/radix-tree/linux.c | 7 ++++++-
tools/testing/radix-tree/linux/gfp.h | 24 ++++++++++++++++++++----
tools/testing/radix-tree/linux/slab.h | 5 -----
3 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 154823737b20..3cfb04e98e2f 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -33,7 +33,12 @@ mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
void *kmem_cache_alloc(struct kmem_cache *cachep, int flags)
{
- void *ret = malloc(cachep->size);
+ void *ret;
+
+ if (flags & __GFP_NOWARN)
+ return NULL;
+
+ ret = malloc(cachep->size);
if (cachep->ctor)
cachep->ctor(ret);
uatomic_inc(&nr_allocated);
diff --git a/tools/testing/radix-tree/linux/gfp.h b/tools/testing/radix-tree/linux/gfp.h
index 0e37f7a760eb..5b09b2ce6c33 100644
--- a/tools/testing/radix-tree/linux/gfp.h
+++ b/tools/testing/radix-tree/linux/gfp.h
@@ -1,10 +1,26 @@
#ifndef _GFP_H
#define _GFP_H
-#define __GFP_BITS_SHIFT 22
+#define __GFP_BITS_SHIFT 26
#define __GFP_BITS_MASK ((gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
-#define __GFP_WAIT 1
-#define __GFP_ACCOUNT 0
-#define __GFP_NOWARN 0
+
+#define __GFP_HIGH 0x20u
+#define __GFP_IO 0x40u
+#define __GFP_FS 0x80u
+#define __GFP_NOWARN 0x200u
+#define __GFP_ATOMIC 0x80000u
+#define __GFP_ACCOUNT 0x100000u
+#define __GFP_DIRECT_RECLAIM 0x400000u
+#define __GFP_KSWAPD_RECLAIM 0x2000000u
+
+#define __GFP_RECLAIM (__GFP_DIRECT_RECLAIM|__GFP_KSWAPD_RECLAIM)
+
+#define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)
+#define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS)
+
+static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
+{
+ return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
+}
#endif
diff --git a/tools/testing/radix-tree/linux/slab.h b/tools/testing/radix-tree/linux/slab.h
index 6d5a34770fd4..452e2bf502e3 100644
--- a/tools/testing/radix-tree/linux/slab.h
+++ b/tools/testing/radix-tree/linux/slab.h
@@ -7,11 +7,6 @@
#define SLAB_PANIC 2
#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
-static inline int gfpflags_allow_blocking(gfp_t mask)
-{
- return 1;
-}
-
struct kmem_cache {
int size;
void (*ctor)(void *);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 02/41] radix tree test suite: Allow GFP_ATOMIC allocations to fail
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
In order to test the preload code, it is necessary to fail GFP_ATOMIC
allocations, which requires defining GFP_KERNEL and GFP_ATOMIC properly.
Remove the obsolete __GFP_WAIT and copy the definitions of the __GFP
flags which are used from the kernel include files. We also need the
real definition of gfpflags_allow_blocking() to persuade the radix tree
to actually use its preallocated nodes.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
tools/testing/radix-tree/linux.c | 7 ++++++-
tools/testing/radix-tree/linux/gfp.h | 24 ++++++++++++++++++++----
tools/testing/radix-tree/linux/slab.h | 5 -----
3 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 154823737b20..3cfb04e98e2f 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -33,7 +33,12 @@ mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
void *kmem_cache_alloc(struct kmem_cache *cachep, int flags)
{
- void *ret = malloc(cachep->size);
+ void *ret;
+
+ if (flags & __GFP_NOWARN)
+ return NULL;
+
+ ret = malloc(cachep->size);
if (cachep->ctor)
cachep->ctor(ret);
uatomic_inc(&nr_allocated);
diff --git a/tools/testing/radix-tree/linux/gfp.h b/tools/testing/radix-tree/linux/gfp.h
index 0e37f7a760eb..5b09b2ce6c33 100644
--- a/tools/testing/radix-tree/linux/gfp.h
+++ b/tools/testing/radix-tree/linux/gfp.h
@@ -1,10 +1,26 @@
#ifndef _GFP_H
#define _GFP_H
-#define __GFP_BITS_SHIFT 22
+#define __GFP_BITS_SHIFT 26
#define __GFP_BITS_MASK ((gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
-#define __GFP_WAIT 1
-#define __GFP_ACCOUNT 0
-#define __GFP_NOWARN 0
+
+#define __GFP_HIGH 0x20u
+#define __GFP_IO 0x40u
+#define __GFP_FS 0x80u
+#define __GFP_NOWARN 0x200u
+#define __GFP_ATOMIC 0x80000u
+#define __GFP_ACCOUNT 0x100000u
+#define __GFP_DIRECT_RECLAIM 0x400000u
+#define __GFP_KSWAPD_RECLAIM 0x2000000u
+
+#define __GFP_RECLAIM (__GFP_DIRECT_RECLAIM|__GFP_KSWAPD_RECLAIM)
+
+#define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)
+#define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS)
+
+static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
+{
+ return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
+}
#endif
diff --git a/tools/testing/radix-tree/linux/slab.h b/tools/testing/radix-tree/linux/slab.h
index 6d5a34770fd4..452e2bf502e3 100644
--- a/tools/testing/radix-tree/linux/slab.h
+++ b/tools/testing/radix-tree/linux/slab.h
@@ -7,11 +7,6 @@
#define SLAB_PANIC 2
#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
-static inline int gfpflags_allow_blocking(gfp_t mask)
-{
- return 1;
-}
-
struct kmem_cache {
int size;
void (*ctor)(void *);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 03/41] radix-tree: Add radix_tree_join
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
This new function allows for the replacement of many smaller entries in
the radix tree with one larger multiorder entry. From the point of view
of an RCU walker, they may see a mixture of the smaller entries and the
large entry during the same walk, but they will never see NULL for an
index which was populated before the join.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 2 +
lib/radix-tree.c | 159 +++++++++++++++++++++++++++-------
tools/testing/radix-tree/multiorder.c | 32 +++++++
3 files changed, 163 insertions(+), 30 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 4c45105dece3..75ae4648d13d 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -319,6 +319,8 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_join(struct radix_tree_root *, unsigned long index,
+ unsigned new_order, void *);
/**
* struct radix_tree_iter - radix tree iterator state
*
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 61b8fb529cef..00830dd77086 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -314,18 +314,14 @@ static void radix_tree_node_rcu_free(struct rcu_head *head)
{
struct radix_tree_node *node =
container_of(head, struct radix_tree_node, rcu_head);
- int i;
/*
- * must only free zeroed nodes into the slab. radix_tree_shrink
- * can leave us with a non-NULL entry in the first slot, so clear
- * that here to make sure.
+ * Must only free zeroed nodes into the slab. We can be left with
+ * non-NULL entries by radix_tree_free_nodes, so clear the entries
+ * and tags here.
*/
- for (i = 0; i < RADIX_TREE_MAX_TAGS; i++)
- tag_clear(node, i, 0);
-
- node->slots[0] = NULL;
- node->count = 0;
+ memset(node->slots, 0, sizeof(node->slots));
+ memset(node->tags, 0, sizeof(node->tags));
kmem_cache_free(radix_tree_node_cachep, node);
}
@@ -557,14 +553,14 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
shift = radix_tree_load_root(root, &child, &maxindex);
/* Make sure the tree is high enough. */
+ if (order > 0 && max == ((1UL << order) - 1))
+ max++;
if (max > maxindex) {
int error = radix_tree_extend(root, max, shift);
if (error < 0)
return error;
shift = error;
child = root->rnode;
- if (order == shift)
- shift += RADIX_TREE_MAP_SHIFT;
}
while (shift > order) {
@@ -576,6 +572,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
return -ENOMEM;
child->shift = shift;
child->offset = offset;
+ child->count = 0;
child->parent = node;
rcu_assign_pointer(*slot, node_to_entry(child));
if (node)
@@ -589,31 +586,113 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
slot = &node->slots[offset];
}
+ if (nodep)
+ *nodep = node;
+ if (slotp)
+ *slotp = slot;
+ return 0;
+}
+
#ifdef CONFIG_RADIX_TREE_MULTIORDER
- /* Insert pointers to the canonical entry */
- if (order > shift) {
- unsigned i, n = 1 << (order - shift);
+/*
+ * Free any nodes below this node. The tree is presumed to not need
+ * shrinking, and any user data in the tree is presumed to not need a
+ * destructor called on it. If we need to add a destructor, we can
+ * add that functionality later. Note that we may not clear tags or
+ * slots from the tree as an RCU walker may still have a pointer into
+ * this subtree. We could replace the entries with RADIX_TREE_RETRY,
+ * but we'll still have to clear those in rcu_free.
+ */
+static void radix_tree_free_nodes(struct radix_tree_node *node)
+{
+ unsigned offset = 0;
+ struct radix_tree_node *child = entry_to_node(node);
+
+ for (;;) {
+ void *entry = child->slots[offset];
+ if (radix_tree_is_internal_node(entry) &&
+ !is_sibling_entry(child, entry)) {
+ child = entry_to_node(entry);
+ offset = 0;
+ continue;
+ }
+ offset++;
+ while (offset == RADIX_TREE_MAP_SIZE) {
+ struct radix_tree_node *old = child;
+ offset = child->offset + 1;
+ child = child->parent;
+ radix_tree_node_free(old);
+ if (old == entry_to_node(node))
+ return;
+ }
+ }
+}
+
+static inline int insert_entries(struct radix_tree_node *node, void **slot,
+ void *ptr, unsigned order, bool replace)
+{
+ struct radix_tree_node *child;
+ unsigned i, n, tag, offset, tags = 0;
+
+ if (node) {
+ n = 1 << (order - node->shift);
+ offset = get_slot_offset(node, slot);
+ } else {
+ n = 1;
+ offset = 0;
+ }
+
+ if (n > 1) {
offset = offset & ~(n - 1);
slot = &node->slots[offset];
- child = node_to_entry(slot);
- for (i = 0; i < n; i++) {
- if (slot[i])
+ }
+ child = node_to_entry(slot);
+
+ for (i = 0; i < n; i++) {
+ if (slot[i]) {
+ if (replace) {
+ node->count--;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tag_get(node, tag, offset + i))
+ tags |= 1 << tag;
+ } else
return -EEXIST;
}
+ }
- for (i = 1; i < n; i++) {
+ for (i = 0; i < n; i++) {
+ struct radix_tree_node *old = slot[i];
+ if (i) {
rcu_assign_pointer(slot[i], child);
- node->count++;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_clear(node, tag, offset + i);
+ } else {
+ rcu_assign_pointer(slot[i], ptr);
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
}
+ if (radix_tree_is_internal_node(old) &&
+ !is_sibling_entry(node, old))
+ radix_tree_free_nodes(old);
}
-#endif
-
- if (nodep)
- *nodep = node;
- if (slotp)
- *slotp = slot;
- return 0;
+ if (node)
+ node->count += n;
+ return n;
+}
+#else
+static inline int insert_entries(struct radix_tree_node *node, void **slot,
+ void *ptr, unsigned order, bool replace)
+{
+ if (*slot)
+ return -EEXIST;
+ rcu_assign_pointer(*slot, ptr);
+ if (node)
+ node->count++;
+ return 1;
}
+#endif
/**
* __radix_tree_insert - insert into a radix tree
@@ -636,13 +715,13 @@ int __radix_tree_insert(struct radix_tree_root *root, unsigned long index,
error = __radix_tree_create(root, index, order, &node, &slot);
if (error)
return error;
- if (*slot != NULL)
- return -EEXIST;
- rcu_assign_pointer(*slot, item);
+
+ error = insert_entries(node, slot, item, order, false);
+ if (error < 0)
+ return error;
if (node) {
unsigned offset = get_slot_offset(node, slot);
- node->count++;
BUG_ON(tag_get(node, 0, offset));
BUG_ON(tag_get(node, 1, offset));
BUG_ON(tag_get(node, 2, offset));
@@ -740,6 +819,26 @@ void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_lookup);
+#ifdef CONFIG_RADIX_TREE_MULTIORDER
+int radix_tree_join(struct radix_tree_root *root, unsigned long index,
+ unsigned order, void *item)
+{
+ struct radix_tree_node *node;
+ void **slot;
+ int error;
+
+ BUG_ON(radix_tree_is_internal_node(item));
+
+ error = __radix_tree_create(root, index, order, &node, &slot);
+ if (!error)
+ error = insert_entries(node, slot, item, order, true);
+ if (error > 0)
+ error = 0;
+
+ return error;
+}
+#endif
+
/**
* radix_tree_tag_set - set a tag on a radix tree node
* @root: radix tree root
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index 39d9b9568fe2..f917da164b00 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -317,6 +317,37 @@ void multiorder_tagged_iteration(void)
item_kill_tree(&tree);
}
+static void __multiorder_join(unsigned long index,
+ unsigned order1, unsigned order2)
+{
+ unsigned long loc;
+ void *item, *item2 = item_create(index + 1);
+ RADIX_TREE(tree, GFP_KERNEL);
+
+ item_insert_order(&tree, index, order2);
+ item = radix_tree_lookup(&tree, index);
+ radix_tree_join(&tree, index + 1, order1, item2);
+ loc = radix_tree_locate_item(&tree, item);
+ if (loc == -1)
+ free(item);
+ item = radix_tree_lookup(&tree, index + 1);
+ assert(item == item2);
+ item_kill_tree(&tree);
+}
+
+static void multiorder_join(void)
+{
+ int i, j, idx;
+
+ for (idx = 0; idx < 1024; idx = idx * 2 + 3) {
+ for (i = 1; i < 15; i++) {
+ for (j = 0; j < i; j++) {
+ __multiorder_join(idx, i, j);
+ }
+ }
+ }
+}
+
void multiorder_checks(void)
{
int i;
@@ -334,4 +365,5 @@ void multiorder_checks(void)
multiorder_tag_tests();
multiorder_iteration();
multiorder_tagged_iteration();
+ multiorder_join();
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 03/41] radix-tree: Add radix_tree_join
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
This new function allows for the replacement of many smaller entries in
the radix tree with one larger multiorder entry. From the point of view
of an RCU walker, they may see a mixture of the smaller entries and the
large entry during the same walk, but they will never see NULL for an
index which was populated before the join.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 2 +
lib/radix-tree.c | 159 +++++++++++++++++++++++++++-------
tools/testing/radix-tree/multiorder.c | 32 +++++++
3 files changed, 163 insertions(+), 30 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 4c45105dece3..75ae4648d13d 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -319,6 +319,8 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_join(struct radix_tree_root *, unsigned long index,
+ unsigned new_order, void *);
/**
* struct radix_tree_iter - radix tree iterator state
*
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 61b8fb529cef..00830dd77086 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -314,18 +314,14 @@ static void radix_tree_node_rcu_free(struct rcu_head *head)
{
struct radix_tree_node *node =
container_of(head, struct radix_tree_node, rcu_head);
- int i;
/*
- * must only free zeroed nodes into the slab. radix_tree_shrink
- * can leave us with a non-NULL entry in the first slot, so clear
- * that here to make sure.
+ * Must only free zeroed nodes into the slab. We can be left with
+ * non-NULL entries by radix_tree_free_nodes, so clear the entries
+ * and tags here.
*/
- for (i = 0; i < RADIX_TREE_MAX_TAGS; i++)
- tag_clear(node, i, 0);
-
- node->slots[0] = NULL;
- node->count = 0;
+ memset(node->slots, 0, sizeof(node->slots));
+ memset(node->tags, 0, sizeof(node->tags));
kmem_cache_free(radix_tree_node_cachep, node);
}
@@ -557,14 +553,14 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
shift = radix_tree_load_root(root, &child, &maxindex);
/* Make sure the tree is high enough. */
+ if (order > 0 && max == ((1UL << order) - 1))
+ max++;
if (max > maxindex) {
int error = radix_tree_extend(root, max, shift);
if (error < 0)
return error;
shift = error;
child = root->rnode;
- if (order == shift)
- shift += RADIX_TREE_MAP_SHIFT;
}
while (shift > order) {
@@ -576,6 +572,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
return -ENOMEM;
child->shift = shift;
child->offset = offset;
+ child->count = 0;
child->parent = node;
rcu_assign_pointer(*slot, node_to_entry(child));
if (node)
@@ -589,31 +586,113 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
slot = &node->slots[offset];
}
+ if (nodep)
+ *nodep = node;
+ if (slotp)
+ *slotp = slot;
+ return 0;
+}
+
#ifdef CONFIG_RADIX_TREE_MULTIORDER
- /* Insert pointers to the canonical entry */
- if (order > shift) {
- unsigned i, n = 1 << (order - shift);
+/*
+ * Free any nodes below this node. The tree is presumed to not need
+ * shrinking, and any user data in the tree is presumed to not need a
+ * destructor called on it. If we need to add a destructor, we can
+ * add that functionality later. Note that we may not clear tags or
+ * slots from the tree as an RCU walker may still have a pointer into
+ * this subtree. We could replace the entries with RADIX_TREE_RETRY,
+ * but we'll still have to clear those in rcu_free.
+ */
+static void radix_tree_free_nodes(struct radix_tree_node *node)
+{
+ unsigned offset = 0;
+ struct radix_tree_node *child = entry_to_node(node);
+
+ for (;;) {
+ void *entry = child->slots[offset];
+ if (radix_tree_is_internal_node(entry) &&
+ !is_sibling_entry(child, entry)) {
+ child = entry_to_node(entry);
+ offset = 0;
+ continue;
+ }
+ offset++;
+ while (offset == RADIX_TREE_MAP_SIZE) {
+ struct radix_tree_node *old = child;
+ offset = child->offset + 1;
+ child = child->parent;
+ radix_tree_node_free(old);
+ if (old == entry_to_node(node))
+ return;
+ }
+ }
+}
+
+static inline int insert_entries(struct radix_tree_node *node, void **slot,
+ void *ptr, unsigned order, bool replace)
+{
+ struct radix_tree_node *child;
+ unsigned i, n, tag, offset, tags = 0;
+
+ if (node) {
+ n = 1 << (order - node->shift);
+ offset = get_slot_offset(node, slot);
+ } else {
+ n = 1;
+ offset = 0;
+ }
+
+ if (n > 1) {
offset = offset & ~(n - 1);
slot = &node->slots[offset];
- child = node_to_entry(slot);
- for (i = 0; i < n; i++) {
- if (slot[i])
+ }
+ child = node_to_entry(slot);
+
+ for (i = 0; i < n; i++) {
+ if (slot[i]) {
+ if (replace) {
+ node->count--;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tag_get(node, tag, offset + i))
+ tags |= 1 << tag;
+ } else
return -EEXIST;
}
+ }
- for (i = 1; i < n; i++) {
+ for (i = 0; i < n; i++) {
+ struct radix_tree_node *old = slot[i];
+ if (i) {
rcu_assign_pointer(slot[i], child);
- node->count++;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_clear(node, tag, offset + i);
+ } else {
+ rcu_assign_pointer(slot[i], ptr);
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
}
+ if (radix_tree_is_internal_node(old) &&
+ !is_sibling_entry(node, old))
+ radix_tree_free_nodes(old);
}
-#endif
-
- if (nodep)
- *nodep = node;
- if (slotp)
- *slotp = slot;
- return 0;
+ if (node)
+ node->count += n;
+ return n;
+}
+#else
+static inline int insert_entries(struct radix_tree_node *node, void **slot,
+ void *ptr, unsigned order, bool replace)
+{
+ if (*slot)
+ return -EEXIST;
+ rcu_assign_pointer(*slot, ptr);
+ if (node)
+ node->count++;
+ return 1;
}
+#endif
/**
* __radix_tree_insert - insert into a radix tree
@@ -636,13 +715,13 @@ int __radix_tree_insert(struct radix_tree_root *root, unsigned long index,
error = __radix_tree_create(root, index, order, &node, &slot);
if (error)
return error;
- if (*slot != NULL)
- return -EEXIST;
- rcu_assign_pointer(*slot, item);
+
+ error = insert_entries(node, slot, item, order, false);
+ if (error < 0)
+ return error;
if (node) {
unsigned offset = get_slot_offset(node, slot);
- node->count++;
BUG_ON(tag_get(node, 0, offset));
BUG_ON(tag_get(node, 1, offset));
BUG_ON(tag_get(node, 2, offset));
@@ -740,6 +819,26 @@ void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_lookup);
+#ifdef CONFIG_RADIX_TREE_MULTIORDER
+int radix_tree_join(struct radix_tree_root *root, unsigned long index,
+ unsigned order, void *item)
+{
+ struct radix_tree_node *node;
+ void **slot;
+ int error;
+
+ BUG_ON(radix_tree_is_internal_node(item));
+
+ error = __radix_tree_create(root, index, order, &node, &slot);
+ if (!error)
+ error = insert_entries(node, slot, item, order, true);
+ if (error > 0)
+ error = 0;
+
+ return error;
+}
+#endif
+
/**
* radix_tree_tag_set - set a tag on a radix tree node
* @root: radix tree root
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index 39d9b9568fe2..f917da164b00 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -317,6 +317,37 @@ void multiorder_tagged_iteration(void)
item_kill_tree(&tree);
}
+static void __multiorder_join(unsigned long index,
+ unsigned order1, unsigned order2)
+{
+ unsigned long loc;
+ void *item, *item2 = item_create(index + 1);
+ RADIX_TREE(tree, GFP_KERNEL);
+
+ item_insert_order(&tree, index, order2);
+ item = radix_tree_lookup(&tree, index);
+ radix_tree_join(&tree, index + 1, order1, item2);
+ loc = radix_tree_locate_item(&tree, item);
+ if (loc == -1)
+ free(item);
+ item = radix_tree_lookup(&tree, index + 1);
+ assert(item == item2);
+ item_kill_tree(&tree);
+}
+
+static void multiorder_join(void)
+{
+ int i, j, idx;
+
+ for (idx = 0; idx < 1024; idx = idx * 2 + 3) {
+ for (i = 1; i < 15; i++) {
+ for (j = 0; j < i; j++) {
+ __multiorder_join(idx, i, j);
+ }
+ }
+ }
+}
+
void multiorder_checks(void)
{
int i;
@@ -334,4 +365,5 @@ void multiorder_checks(void)
multiorder_tag_tests();
multiorder_iteration();
multiorder_tagged_iteration();
+ multiorder_join();
}
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 04/41] radix-tree: Add radix_tree_split
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
This new function splits a larger multiorder entry into smaller entries
(potentially multi-order entries). These entries are initialised to
RADIX_TREE_RETRY to ensure that RCU walkers who see this state aren't
confused. The caller should then call radix_tree_for_each_slot() and
radix_tree_replace_slot() in order to turn these retry entries into the
intended new entries. Tags are replicated from the original multiorder
entry into each new entry.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 6 +-
lib/radix-tree.c | 109 ++++++++++++++++++++++++++++++++--
tools/testing/radix-tree/multiorder.c | 26 ++++++++
3 files changed, 135 insertions(+), 6 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 75ae4648d13d..459e8a152c8a 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -280,8 +280,7 @@ bool __radix_tree_delete_node(struct radix_tree_root *root,
struct radix_tree_node *node);
void *radix_tree_delete_item(struct radix_tree_root *, unsigned long, void *);
void *radix_tree_delete(struct radix_tree_root *, unsigned long);
-struct radix_tree_node *radix_tree_replace_clear_tags(
- struct radix_tree_root *root,
+struct radix_tree_node *radix_tree_replace_clear_tags(struct radix_tree_root *,
unsigned long index, void *entry);
unsigned int radix_tree_gang_lookup(struct radix_tree_root *root,
void **results, unsigned long first_index,
@@ -319,8 +318,11 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_split(struct radix_tree_root *, unsigned long index,
+ unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,
unsigned new_order, void *);
+
/**
* struct radix_tree_iter - radix tree iterator state
*
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 00830dd77086..e69f1053cd78 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -231,7 +231,10 @@ static void dump_node(struct radix_tree_node *node, unsigned long index)
void *entry = node->slots[i];
if (!entry)
continue;
- if (is_sibling_entry(node, entry)) {
+ if (entry == RADIX_TREE_RETRY) {
+ pr_debug("radix retry offset %ld indices %ld-%ld\n",
+ i, first, last);
+ } else if (is_sibling_entry(node, entry)) {
pr_debug("radix sblng %p offset %ld val %p indices %ld-%ld\n",
entry, i,
*(void **)entry_to_node(entry),
@@ -635,7 +638,10 @@ static inline int insert_entries(struct radix_tree_node *node, void **slot,
unsigned i, n, tag, offset, tags = 0;
if (node) {
- n = 1 << (order - node->shift);
+ if (order > node->shift)
+ n = 1 << (order - node->shift);
+ else
+ n = 1;
offset = get_slot_offset(node, slot);
} else {
n = 1;
@@ -674,7 +680,8 @@ static inline int insert_entries(struct radix_tree_node *node, void **slot,
tag_set(node, tag, offset);
}
if (radix_tree_is_internal_node(old) &&
- !is_sibling_entry(node, old))
+ !is_sibling_entry(node, old) &&
+ (old != RADIX_TREE_RETRY))
radix_tree_free_nodes(old);
}
if (node)
@@ -837,6 +844,98 @@ int radix_tree_join(struct radix_tree_root *root, unsigned long index,
return error;
}
+
+int radix_tree_split(struct radix_tree_root *root, unsigned long index,
+ unsigned order)
+{
+ struct radix_tree_node *parent, *node, *child;
+ void **slot;
+ unsigned int offset, end;
+ unsigned n, tag, tags = 0;
+
+ if (!__radix_tree_lookup(root, index, &parent, &slot))
+ return -ENOENT;
+ if (!parent)
+ return -ENOENT;
+
+ offset = get_slot_offset(parent, slot);
+
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tag_get(parent, tag, offset))
+ tags |= 1 << tag;
+
+ for (end = offset + 1; end < RADIX_TREE_MAP_SIZE; end++) {
+ if (!is_sibling_entry(parent, parent->slots[end]))
+ break;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(parent, tag, end);
+ /* tags must be set before RETRY is set */
+ rcu_assign_pointer(parent->slots[end], RADIX_TREE_RETRY);
+ }
+
+ if (order == parent->shift)
+ return 0;
+ if (order > parent->shift) {
+ while (offset < end)
+ offset += insert_entries(parent, &parent->slots[offset],
+ RADIX_TREE_RETRY, order, true);
+ return 0;
+ }
+
+ node = parent;
+
+ for (;;) {
+ if (node->shift > order) {
+ child = radix_tree_node_alloc(root);
+ if (!child)
+ goto nomem;
+ child->shift = node->shift - RADIX_TREE_MAP_SHIFT;
+ child->offset = offset;
+ child->count = 0;
+ child->parent = node;
+ if (node != parent) {
+ node->count++;
+ node->slots[offset] = node_to_entry(child);
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
+ }
+
+ node = child;
+ offset = 0;
+ continue;
+ }
+
+ n = insert_entries(node, &node->slots[offset],
+ RADIX_TREE_RETRY, order, false);
+ BUG_ON(n > RADIX_TREE_MAP_SIZE);
+
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
+ offset += n;
+
+ while (offset == RADIX_TREE_MAP_SIZE) {
+ if (node == parent)
+ break;
+ offset = node->offset;
+ child = node;
+ node = node->parent;
+ rcu_assign_pointer(node->slots[offset],
+ node_to_entry(child));
+ offset++;
+ }
+ if ((node == parent) && (offset == end))
+ return 0;
+ }
+
+ nomem:
+ /* Shouldn't happen; did user forget to preload? */
+ /* TODO: free all the allocated nodes */
+ WARN_ON(1);
+ return -ENOMEM;
+}
#endif
/**
@@ -1075,8 +1174,10 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
child = rcu_dereference_raw(node->slots[offset]);
}
- if ((child == NULL) || (child == RADIX_TREE_RETRY))
+ if (!child)
goto restart;
+ if (child == RADIX_TREE_RETRY)
+ break;
} while (radix_tree_is_internal_node(child));
/* Update the iterator state */
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index f917da164b00..9d27a4dd7b2a 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -348,6 +348,31 @@ static void multiorder_join(void)
}
}
+static void __multiorder_split(int old_order, int new_order)
+{
+ RADIX_TREE(tree, GFP_KERNEL);
+ void **slot;
+ struct radix_tree_iter iter;
+
+ item_insert_order(&tree, 0, old_order);
+ radix_tree_tag_set(&tree, 0, 2);
+ radix_tree_split(&tree, 0, new_order);
+ radix_tree_for_each_slot(slot, &tree, &iter, 0) {
+ radix_tree_replace_slot(slot, item_create(iter.index));
+ }
+
+ item_kill_tree(&tree);
+}
+
+static void multiorder_split(void)
+{
+ int i, j;
+
+ for (i = 9; i < 19; i++)
+ for (j = 0; j < i; j++)
+ __multiorder_split(i, j);
+}
+
void multiorder_checks(void)
{
int i;
@@ -366,4 +391,5 @@ void multiorder_checks(void)
multiorder_iteration();
multiorder_tagged_iteration();
multiorder_join();
+ multiorder_split();
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 04/41] radix-tree: Add radix_tree_split
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
This new function splits a larger multiorder entry into smaller entries
(potentially multi-order entries). These entries are initialised to
RADIX_TREE_RETRY to ensure that RCU walkers who see this state aren't
confused. The caller should then call radix_tree_for_each_slot() and
radix_tree_replace_slot() in order to turn these retry entries into the
intended new entries. Tags are replicated from the original multiorder
entry into each new entry.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 6 +-
lib/radix-tree.c | 109 ++++++++++++++++++++++++++++++++--
tools/testing/radix-tree/multiorder.c | 26 ++++++++
3 files changed, 135 insertions(+), 6 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 75ae4648d13d..459e8a152c8a 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -280,8 +280,7 @@ bool __radix_tree_delete_node(struct radix_tree_root *root,
struct radix_tree_node *node);
void *radix_tree_delete_item(struct radix_tree_root *, unsigned long, void *);
void *radix_tree_delete(struct radix_tree_root *, unsigned long);
-struct radix_tree_node *radix_tree_replace_clear_tags(
- struct radix_tree_root *root,
+struct radix_tree_node *radix_tree_replace_clear_tags(struct radix_tree_root *,
unsigned long index, void *entry);
unsigned int radix_tree_gang_lookup(struct radix_tree_root *root,
void **results, unsigned long first_index,
@@ -319,8 +318,11 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_split(struct radix_tree_root *, unsigned long index,
+ unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,
unsigned new_order, void *);
+
/**
* struct radix_tree_iter - radix tree iterator state
*
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 00830dd77086..e69f1053cd78 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -231,7 +231,10 @@ static void dump_node(struct radix_tree_node *node, unsigned long index)
void *entry = node->slots[i];
if (!entry)
continue;
- if (is_sibling_entry(node, entry)) {
+ if (entry == RADIX_TREE_RETRY) {
+ pr_debug("radix retry offset %ld indices %ld-%ld\n",
+ i, first, last);
+ } else if (is_sibling_entry(node, entry)) {
pr_debug("radix sblng %p offset %ld val %p indices %ld-%ld\n",
entry, i,
*(void **)entry_to_node(entry),
@@ -635,7 +638,10 @@ static inline int insert_entries(struct radix_tree_node *node, void **slot,
unsigned i, n, tag, offset, tags = 0;
if (node) {
- n = 1 << (order - node->shift);
+ if (order > node->shift)
+ n = 1 << (order - node->shift);
+ else
+ n = 1;
offset = get_slot_offset(node, slot);
} else {
n = 1;
@@ -674,7 +680,8 @@ static inline int insert_entries(struct radix_tree_node *node, void **slot,
tag_set(node, tag, offset);
}
if (radix_tree_is_internal_node(old) &&
- !is_sibling_entry(node, old))
+ !is_sibling_entry(node, old) &&
+ (old != RADIX_TREE_RETRY))
radix_tree_free_nodes(old);
}
if (node)
@@ -837,6 +844,98 @@ int radix_tree_join(struct radix_tree_root *root, unsigned long index,
return error;
}
+
+int radix_tree_split(struct radix_tree_root *root, unsigned long index,
+ unsigned order)
+{
+ struct radix_tree_node *parent, *node, *child;
+ void **slot;
+ unsigned int offset, end;
+ unsigned n, tag, tags = 0;
+
+ if (!__radix_tree_lookup(root, index, &parent, &slot))
+ return -ENOENT;
+ if (!parent)
+ return -ENOENT;
+
+ offset = get_slot_offset(parent, slot);
+
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tag_get(parent, tag, offset))
+ tags |= 1 << tag;
+
+ for (end = offset + 1; end < RADIX_TREE_MAP_SIZE; end++) {
+ if (!is_sibling_entry(parent, parent->slots[end]))
+ break;
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(parent, tag, end);
+ /* tags must be set before RETRY is set */
+ rcu_assign_pointer(parent->slots[end], RADIX_TREE_RETRY);
+ }
+
+ if (order == parent->shift)
+ return 0;
+ if (order > parent->shift) {
+ while (offset < end)
+ offset += insert_entries(parent, &parent->slots[offset],
+ RADIX_TREE_RETRY, order, true);
+ return 0;
+ }
+
+ node = parent;
+
+ for (;;) {
+ if (node->shift > order) {
+ child = radix_tree_node_alloc(root);
+ if (!child)
+ goto nomem;
+ child->shift = node->shift - RADIX_TREE_MAP_SHIFT;
+ child->offset = offset;
+ child->count = 0;
+ child->parent = node;
+ if (node != parent) {
+ node->count++;
+ node->slots[offset] = node_to_entry(child);
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
+ }
+
+ node = child;
+ offset = 0;
+ continue;
+ }
+
+ n = insert_entries(node, &node->slots[offset],
+ RADIX_TREE_RETRY, order, false);
+ BUG_ON(n > RADIX_TREE_MAP_SIZE);
+
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
+ if (tags & (1 << tag))
+ tag_set(node, tag, offset);
+ offset += n;
+
+ while (offset == RADIX_TREE_MAP_SIZE) {
+ if (node == parent)
+ break;
+ offset = node->offset;
+ child = node;
+ node = node->parent;
+ rcu_assign_pointer(node->slots[offset],
+ node_to_entry(child));
+ offset++;
+ }
+ if ((node == parent) && (offset == end))
+ return 0;
+ }
+
+ nomem:
+ /* Shouldn't happen; did user forget to preload? */
+ /* TODO: free all the allocated nodes */
+ WARN_ON(1);
+ return -ENOMEM;
+}
#endif
/**
@@ -1075,8 +1174,10 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
child = rcu_dereference_raw(node->slots[offset]);
}
- if ((child == NULL) || (child == RADIX_TREE_RETRY))
+ if (!child)
goto restart;
+ if (child == RADIX_TREE_RETRY)
+ break;
} while (radix_tree_is_internal_node(child));
/* Update the iterator state */
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index f917da164b00..9d27a4dd7b2a 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -348,6 +348,31 @@ static void multiorder_join(void)
}
}
+static void __multiorder_split(int old_order, int new_order)
+{
+ RADIX_TREE(tree, GFP_KERNEL);
+ void **slot;
+ struct radix_tree_iter iter;
+
+ item_insert_order(&tree, 0, old_order);
+ radix_tree_tag_set(&tree, 0, 2);
+ radix_tree_split(&tree, 0, new_order);
+ radix_tree_for_each_slot(slot, &tree, &iter, 0) {
+ radix_tree_replace_slot(slot, item_create(iter.index));
+ }
+
+ item_kill_tree(&tree);
+}
+
+static void multiorder_split(void)
+{
+ int i, j;
+
+ for (i = 9; i < 19; i++)
+ for (j = 0; j < i; j++)
+ __multiorder_split(i, j);
+}
+
void multiorder_checks(void)
{
int i;
@@ -366,4 +391,5 @@ void multiorder_checks(void)
multiorder_iteration();
multiorder_tagged_iteration();
multiorder_join();
+ multiorder_split();
}
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 05/41] radix-tree: Add radix_tree_split_preload()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
Calculate how many nodes we need to allocate to split an old_order entry
into multiple entries, each of size new_order. The test suite checks that
we allocated exactly the right number of nodes; neither too many (checked
by rtp->nr == 0), nor too few (checked by comparing nr_allocated before
and after the call to radix_tree_split()).
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 1 +
lib/radix-tree.c | 22 ++++++++++++++++++++++
tools/testing/radix-tree/multiorder.c | 28 ++++++++++++++++++++++++++--
tools/testing/radix-tree/test.h | 9 +++++++++
4 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 459e8a152c8a..c4cea311d901 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -318,6 +318,7 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_split_preload(unsigned old_order, unsigned new_order, gfp_t);
int radix_tree_split(struct radix_tree_root *, unsigned long index,
unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e69f1053cd78..e49f32f7c537 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -404,6 +404,28 @@ int radix_tree_maybe_preload(gfp_t gfp_mask)
}
EXPORT_SYMBOL(radix_tree_maybe_preload);
+#ifdef CONFIG_RADIX_TREE_MULTIORDER
+/*
+ * Preload with enough objects to ensure that we can split a single entry
+ * of order @old_order into many entries of size @new_order
+ */
+int radix_tree_split_preload(unsigned int old_order, unsigned int new_order,
+ gfp_t gfp_mask)
+{
+ unsigned top = 1 << (old_order % RADIX_TREE_MAP_SHIFT);
+ unsigned layers = (old_order / RADIX_TREE_MAP_SHIFT) -
+ (new_order / RADIX_TREE_MAP_SHIFT);
+ unsigned nr = 0;
+
+ WARN_ON_ONCE(!gfpflags_allow_blocking(gfp_mask));
+ BUG_ON(new_order >= old_order);
+
+ while (layers--)
+ nr = nr * RADIX_TREE_MAP_SIZE + 1;
+ return __radix_tree_preload(gfp_mask, top * nr);
+}
+#endif
+
/*
* The same as function above, but preload number of nodes required to insert
* (1 << order) continuous naturally-aligned elements.
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index 9d27a4dd7b2a..5eda47dfe818 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -348,18 +348,42 @@ static void multiorder_join(void)
}
}
+static void check_mem(unsigned old_order, unsigned new_order, unsigned alloc)
+{
+ struct radix_tree_preload *rtp = &radix_tree_preloads;
+ if (rtp->nr != 0)
+ printf("split(%u %u) remaining %u\n", old_order, new_order,
+ rtp->nr);
+ /*
+ * Can't check for equality here as some nodes may have been
+ * RCU-freed while we ran. But we should never finish with more
+ * nodes allocated since they should have all been preloaded.
+ */
+ if (nr_allocated > alloc)
+ printf("split(%u %u) allocated %u %u\n", old_order, new_order,
+ alloc, nr_allocated);
+}
+
static void __multiorder_split(int old_order, int new_order)
{
- RADIX_TREE(tree, GFP_KERNEL);
+ RADIX_TREE(tree, GFP_ATOMIC);
void **slot;
struct radix_tree_iter iter;
+ unsigned alloc;
- item_insert_order(&tree, 0, old_order);
+ radix_tree_preload(GFP_KERNEL);
+ assert(item_insert_order(&tree, 0, old_order) == 0);
+ radix_tree_callback(NULL, CPU_DEAD, NULL);
radix_tree_tag_set(&tree, 0, 2);
+
+ radix_tree_split_preload(old_order, new_order, GFP_KERNEL);
+ alloc = nr_allocated;
radix_tree_split(&tree, 0, new_order);
+ check_mem(old_order, new_order, alloc);
radix_tree_for_each_slot(slot, &tree, &iter, 0) {
radix_tree_replace_slot(slot, item_create(iter.index));
}
+ radix_tree_preload_end();
item_kill_tree(&tree);
}
diff --git a/tools/testing/radix-tree/test.h b/tools/testing/radix-tree/test.h
index e85131369723..55e6d095047b 100644
--- a/tools/testing/radix-tree/test.h
+++ b/tools/testing/radix-tree/test.h
@@ -2,6 +2,8 @@
#include <linux/types.h>
#include <linux/radix-tree.h>
#include <linux/rcupdate.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
struct item {
unsigned long index;
@@ -43,3 +45,10 @@ void radix_tree_dump(struct radix_tree_root *root);
int root_tag_get(struct radix_tree_root *root, unsigned int tag);
unsigned long node_maxindex(struct radix_tree_node *);
unsigned long shift_maxindex(unsigned int shift);
+int radix_tree_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu);
+struct radix_tree_preload {
+ unsigned nr;
+ struct radix_tree_node *nodes;
+};
+extern struct radix_tree_preload radix_tree_preloads;
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 05/41] radix-tree: Add radix_tree_split_preload()
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Matthew Wilcox, Kirill A . Shutemov
From: Matthew Wilcox <willy@linux.intel.com>
Calculate how many nodes we need to allocate to split an old_order entry
into multiple entries, each of size new_order. The test suite checks that
we allocated exactly the right number of nodes; neither too many (checked
by rtp->nr == 0), nor too few (checked by comparing nr_allocated before
and after the call to radix_tree_split()).
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 1 +
lib/radix-tree.c | 22 ++++++++++++++++++++++
tools/testing/radix-tree/multiorder.c | 28 ++++++++++++++++++++++++++--
tools/testing/radix-tree/test.h | 9 +++++++++
4 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 459e8a152c8a..c4cea311d901 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -318,6 +318,7 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_split_preload(unsigned old_order, unsigned new_order, gfp_t);
int radix_tree_split(struct radix_tree_root *, unsigned long index,
unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e69f1053cd78..e49f32f7c537 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -404,6 +404,28 @@ int radix_tree_maybe_preload(gfp_t gfp_mask)
}
EXPORT_SYMBOL(radix_tree_maybe_preload);
+#ifdef CONFIG_RADIX_TREE_MULTIORDER
+/*
+ * Preload with enough objects to ensure that we can split a single entry
+ * of order @old_order into many entries of size @new_order
+ */
+int radix_tree_split_preload(unsigned int old_order, unsigned int new_order,
+ gfp_t gfp_mask)
+{
+ unsigned top = 1 << (old_order % RADIX_TREE_MAP_SHIFT);
+ unsigned layers = (old_order / RADIX_TREE_MAP_SHIFT) -
+ (new_order / RADIX_TREE_MAP_SHIFT);
+ unsigned nr = 0;
+
+ WARN_ON_ONCE(!gfpflags_allow_blocking(gfp_mask));
+ BUG_ON(new_order >= old_order);
+
+ while (layers--)
+ nr = nr * RADIX_TREE_MAP_SIZE + 1;
+ return __radix_tree_preload(gfp_mask, top * nr);
+}
+#endif
+
/*
* The same as function above, but preload number of nodes required to insert
* (1 << order) continuous naturally-aligned elements.
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index 9d27a4dd7b2a..5eda47dfe818 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -348,18 +348,42 @@ static void multiorder_join(void)
}
}
+static void check_mem(unsigned old_order, unsigned new_order, unsigned alloc)
+{
+ struct radix_tree_preload *rtp = &radix_tree_preloads;
+ if (rtp->nr != 0)
+ printf("split(%u %u) remaining %u\n", old_order, new_order,
+ rtp->nr);
+ /*
+ * Can't check for equality here as some nodes may have been
+ * RCU-freed while we ran. But we should never finish with more
+ * nodes allocated since they should have all been preloaded.
+ */
+ if (nr_allocated > alloc)
+ printf("split(%u %u) allocated %u %u\n", old_order, new_order,
+ alloc, nr_allocated);
+}
+
static void __multiorder_split(int old_order, int new_order)
{
- RADIX_TREE(tree, GFP_KERNEL);
+ RADIX_TREE(tree, GFP_ATOMIC);
void **slot;
struct radix_tree_iter iter;
+ unsigned alloc;
- item_insert_order(&tree, 0, old_order);
+ radix_tree_preload(GFP_KERNEL);
+ assert(item_insert_order(&tree, 0, old_order) == 0);
+ radix_tree_callback(NULL, CPU_DEAD, NULL);
radix_tree_tag_set(&tree, 0, 2);
+
+ radix_tree_split_preload(old_order, new_order, GFP_KERNEL);
+ alloc = nr_allocated;
radix_tree_split(&tree, 0, new_order);
+ check_mem(old_order, new_order, alloc);
radix_tree_for_each_slot(slot, &tree, &iter, 0) {
radix_tree_replace_slot(slot, item_create(iter.index));
}
+ radix_tree_preload_end();
item_kill_tree(&tree);
}
diff --git a/tools/testing/radix-tree/test.h b/tools/testing/radix-tree/test.h
index e85131369723..55e6d095047b 100644
--- a/tools/testing/radix-tree/test.h
+++ b/tools/testing/radix-tree/test.h
@@ -2,6 +2,8 @@
#include <linux/types.h>
#include <linux/radix-tree.h>
#include <linux/rcupdate.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
struct item {
unsigned long index;
@@ -43,3 +45,10 @@ void radix_tree_dump(struct radix_tree_root *root);
int root_tag_get(struct radix_tree_root *root, unsigned int tag);
unsigned long node_maxindex(struct radix_tree_node *);
unsigned long shift_maxindex(unsigned int shift);
+int radix_tree_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu);
+struct radix_tree_preload {
+ unsigned nr;
+ struct radix_tree_node *nodes;
+};
+extern struct radix_tree_preload radix_tree_preloads;
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 06/41] radix-tree: Handle multiorder entries being deleted by replace_clear_tags
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A . Shutemov
From: Matthew Wilcox <willy@infradead.org>
radix_tree_replace_clear_tags() can be called with NULL as the replacement
value; in this case we need to delete sibling entries which point to
the slot.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
lib/radix-tree.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e49f32f7c537..89092c4011b8 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1799,17 +1799,23 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_delete);
+/*
+ * If the caller passes NULL for @entry, it must take care to adjust
+ * node->count. See page_cache_tree_delete() for an example.
+ */
struct radix_tree_node *radix_tree_replace_clear_tags(
struct radix_tree_root *root,
unsigned long index, void *entry)
{
struct radix_tree_node *node;
void **slot;
+ unsigned int offset;
__radix_tree_lookup(root, index, &node, &slot);
if (node) {
- unsigned int tag, offset = get_slot_offset(node, slot);
+ unsigned int tag;
+ offset = get_slot_offset(node, slot);
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
node_tag_clear(root, node, tag, offset);
} else {
@@ -1818,6 +1824,9 @@ struct radix_tree_node *radix_tree_replace_clear_tags(
}
radix_tree_replace_slot(slot, entry);
+ if (!entry && node)
+ delete_sibling_entries(node, node_to_entry(slot), offset);
+
return node;
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 06/41] radix-tree: Handle multiorder entries being deleted by replace_clear_tags
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A . Shutemov
From: Matthew Wilcox <willy@infradead.org>
radix_tree_replace_clear_tags() can be called with NULL as the replacement
value; in this case we need to delete sibling entries which point to
the slot.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
lib/radix-tree.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e49f32f7c537..89092c4011b8 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1799,17 +1799,23 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_delete);
+/*
+ * If the caller passes NULL for @entry, it must take care to adjust
+ * node->count. See page_cache_tree_delete() for an example.
+ */
struct radix_tree_node *radix_tree_replace_clear_tags(
struct radix_tree_root *root,
unsigned long index, void *entry)
{
struct radix_tree_node *node;
void **slot;
+ unsigned int offset;
__radix_tree_lookup(root, index, &node, &slot);
if (node) {
- unsigned int tag, offset = get_slot_offset(node, slot);
+ unsigned int tag;
+ offset = get_slot_offset(node, slot);
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
node_tag_clear(root, node, tag, offset);
} else {
@@ -1818,6 +1824,9 @@ struct radix_tree_node *radix_tree_replace_clear_tags(
}
radix_tree_replace_slot(slot, entry);
+ if (!entry && node)
+ delete_sibling_entries(node, node_to_entry(slot), offset);
+
return node;
}
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 07/41] mm, shmem: swich huge tmpfs to multi-order radix-tree entries
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We would need to use multi-order radix-tree entires for ext4 and other
filesystems to have coherent view on tags (dirty/towrite) in the tree.
This patch converts huge tmpfs implementation to multi-order entries, so
we will be able to use the same code patch for all filesystems.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 320 +++++++++++++++++++++++++++++++++----------------------
mm/huge_memory.c | 47 +++++---
mm/khugepaged.c | 26 ++---
mm/shmem.c | 36 ++-----
4 files changed, 247 insertions(+), 182 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 3083ded98b15..eca8740d2d02 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -114,7 +114,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
struct page *page, void *shadow)
{
struct radix_tree_node *node;
- int i, nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
+ int nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageTail(page), page);
@@ -132,36 +132,32 @@ static void page_cache_tree_delete(struct address_space *mapping,
}
mapping->nrpages -= nr;
- for (i = 0; i < nr; i++) {
- node = radix_tree_replace_clear_tags(&mapping->page_tree,
- page->index + i, shadow);
- if (!node) {
- VM_BUG_ON_PAGE(nr != 1, page);
- return;
- }
+ node = radix_tree_replace_clear_tags(&mapping->page_tree,
+ page->index, shadow);
+ if (!node)
+ return;
- workingset_node_pages_dec(node);
- if (shadow)
- workingset_node_shadows_inc(node);
- else
- if (__radix_tree_delete_node(&mapping->page_tree, node))
- continue;
+ workingset_node_pages_dec(node);
+ if (shadow)
+ workingset_node_shadows_inc(node);
+ else
+ if (__radix_tree_delete_node(&mapping->page_tree, node))
+ return;
- /*
- * Track node that only contains shadow entries. DAX mappings
- * contain no shadow entries and may contain other exceptional
- * entries so skip those.
- *
- * Avoid acquiring the list_lru lock if already tracked.
- * The list_empty() test is safe as node->private_list is
- * protected by mapping->tree_lock.
- */
- if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
- list_empty(&node->private_list)) {
- node->private_data = mapping;
- list_lru_add(&workingset_shadow_nodes,
- &node->private_list);
- }
+ /*
+ * Track node that only contains shadow entries. DAX mappings
+ * contain no shadow entries and may contain other exceptional
+ * entries so skip those.
+ *
+ * Avoid acquiring the list_lru lock if already tracked.
+ * The list_empty() test is safe as node->private_list is
+ * protected by mapping->tree_lock.
+ */
+ if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
+ list_empty(&node->private_list)) {
+ node->private_data = mapping;
+ list_lru_add(&workingset_shadow_nodes,
+ &node->private_list);
}
}
@@ -264,12 +260,7 @@ void delete_from_page_cache(struct page *page)
if (freepage)
freepage(page);
- if (PageTransHuge(page) && !PageHuge(page)) {
- page_ref_sub(page, HPAGE_PMD_NR);
- VM_BUG_ON_PAGE(page_count(page) <= 0, page);
- } else {
- put_page(page);
- }
+ put_page(page);
}
EXPORT_SYMBOL(delete_from_page_cache);
@@ -1073,7 +1064,7 @@ EXPORT_SYMBOL(page_cache_prev_hole);
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset)
{
void **pagep;
- struct page *head, *page;
+ struct page *page;
rcu_read_lock();
repeat:
@@ -1094,25 +1085,25 @@ repeat:
goto out;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/*
* Has the page moved?
* This is part of the lockless pagecache protocol. See
* include/linux/pagemap.h for details.
*/
if (unlikely(page != *pagep)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(offset - page->index < 0);
+ VM_BUG_ON(offset - page->index >= HPAGE_PMD_NR);
+ page += offset - page->index;
+ }
}
out:
rcu_read_unlock();
@@ -1275,7 +1266,7 @@ unsigned find_get_entries(struct address_space *mapping,
struct page **entries, pgoff_t *indices)
{
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
struct radix_tree_iter iter;
if (!nr_entries)
@@ -1283,7 +1274,10 @@ unsigned find_get_entries(struct address_space *mapping,
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1301,26 +1295,38 @@ repeat:
goto export;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
export:
- indices[ret] = iter.index;
+ indices[ret] = index;
entries[ret] = page;
if (++ret == nr_entries)
break;
+ if (radix_tree_exception(page) || !PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_entries &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++) {
+ indices[ret] = ++index;
+ entries[ret] = ++page;
+ }
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_entries)
+ break;
}
rcu_read_unlock();
return ret;
@@ -1347,14 +1353,17 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
{
struct radix_tree_iter iter;
void **slot;
- unsigned ret = 0;
+ unsigned refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1373,25 +1382,35 @@ repeat:
continue;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
@@ -1410,19 +1429,22 @@ repeat:
*
* find_get_pages_contig() returns the number of pages which were found.
*/
-unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
+unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
unsigned int nr_pages, struct page **pages)
{
struct radix_tree_iter iter;
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
- radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, index) {
- struct page *head, *page;
+ radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, start) {
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
/* The hole, there no reason to continue */
@@ -1442,19 +1464,12 @@ repeat:
break;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
@@ -1463,14 +1478,31 @@ repeat:
* otherwise we can get both false positives and false
* negatives, which is just confusing to the caller.
*/
- if (page->mapping == NULL || page_to_pgoff(page) != iter.index) {
+ if (page->mapping == NULL || page_to_pgoff(page) != index) {
put_page(page);
break;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
return ret;
@@ -1488,20 +1520,23 @@ EXPORT_SYMBOL(find_get_pages_contig);
* Like find_get_pages, except we only return pages which are tagged with
* @tag. We update @index to index the next page for the traversal.
*/
-unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index,
+unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *indexp,
int tag, unsigned int nr_pages, struct page **pages)
{
struct radix_tree_iter iter;
void **slot;
- unsigned ret = 0;
+ unsigned refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
radix_tree_for_each_tagged(slot, &mapping->page_tree,
- &iter, *index, tag) {
- struct page *head, *page;
+ &iter, *indexp, tag) {
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < *indexp)
+ index = *indexp;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1526,31 +1561,41 @@ repeat:
continue;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
if (ret)
- *index = pages[ret - 1]->index + 1;
+ *indexp = page_to_pgoff(pages[ret - 1]) + 1;
return ret;
}
@@ -1573,7 +1618,7 @@ unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
struct page **entries, pgoff_t *indices)
{
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
struct radix_tree_iter iter;
if (!nr_entries)
@@ -1582,7 +1627,10 @@ unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
rcu_read_lock();
radix_tree_for_each_tagged(slot, &mapping->page_tree,
&iter, start, tag) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1601,26 +1649,38 @@ repeat:
goto export;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
export:
- indices[ret] = iter.index;
+ indices[ret] = index;
entries[ret] = page;
if (++ret == nr_entries)
break;
+ if (radix_tree_exception(page) || !PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_entries &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++) {
+ indices[ret] = ++index;
+ entries[ret] = ++page;
+ }
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_entries)
+ break;
}
rcu_read_unlock();
return ret;
@@ -2202,12 +2262,15 @@ void filemap_map_pages(struct fault_env *fe,
struct address_space *mapping = file->f_mapping;
pgoff_t last_pgoff = start_pgoff;
loff_t size;
- struct page *head, *page;
+ struct page *page;
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
start_pgoff) {
- if (iter.index > end_pgoff)
+ unsigned long index = iter.index;
+ if (index < start_pgoff)
+ index = start_pgoff;
+ if (index > end_pgoff)
break;
repeat:
page = radix_tree_deref_slot(slot);
@@ -2218,25 +2281,26 @@ repeat:
slot = radix_tree_iter_retry(&iter);
continue;
}
+ page = NULL;
goto next;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
if (!PageUptodate(page) ||
PageReadahead(page) ||
PageHWPoison(page))
@@ -2244,20 +2308,20 @@ repeat:
if (!trylock_page(page))
goto skip;
- if (page->mapping != mapping || !PageUptodate(page))
+ if (page_mapping(page) != mapping || !PageUptodate(page))
goto unlock;
size = round_up(i_size_read(mapping->host), PAGE_SIZE);
- if (page->index >= size >> PAGE_SHIFT)
+ if (compound_head(page)->index >= size >> PAGE_SHIFT)
goto unlock;
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
- fe->address += (iter.index - last_pgoff) << PAGE_SHIFT;
+ fe->address += (index - last_pgoff) << PAGE_SHIFT;
if (fe->pte)
- fe->pte += iter.index - last_pgoff;
- last_pgoff = iter.index;
+ fe->pte += index - last_pgoff;
+ last_pgoff = index;
if (alloc_set_pte(fe, NULL, page))
goto unlock;
unlock_page(page);
@@ -2270,8 +2334,14 @@ next:
/* Huge page is mapped? No need to proceed. */
if (pmd_trans_huge(*fe->pmd))
break;
- if (iter.index == end_pgoff)
+ if (index == end_pgoff)
break;
+ if (page && PageTransCompound(page) &&
+ (index & (HPAGE_PMD_NR - 1)) !=
+ HPAGE_PMD_NR - 1) {
+ index++;
+ goto repeat;
+ }
}
rcu_read_unlock();
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2373f0a7d340..7937f723c96e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1819,6 +1819,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
struct page *head = compound_head(page);
struct zone *zone = page_zone(head);
struct lruvec *lruvec;
+ struct page *subpage;
pgoff_t end = -1;
int i;
@@ -1827,8 +1828,26 @@ static void __split_huge_page(struct page *page, struct list_head *list,
/* complete memcg works before add pages to LRU */
mem_cgroup_split_huge_fixup(head);
- if (!PageAnon(page))
- end = DIV_ROUND_UP(i_size_read(head->mapping->host), PAGE_SIZE);
+ if (!PageAnon(head)) {
+ struct address_space *mapping = head->mapping;
+ struct radix_tree_iter iter;
+ void **slot;
+
+ __dec_node_page_state(head, NR_SHMEM_THPS);
+
+ radix_tree_split(&mapping->page_tree, head->index, 0);
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
+ head->index) {
+ if (iter.index >= head->index + HPAGE_PMD_NR)
+ break;
+ subpage = head + iter.index - head->index;
+ radix_tree_replace_slot(slot, subpage);
+ VM_BUG_ON_PAGE(compound_head(subpage) != head, subpage);
+ }
+ radix_tree_preload_end();
+
+ end = DIV_ROUND_UP(i_size_read(mapping->host), PAGE_SIZE);
+ }
for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
__split_huge_page_tail(head, i, lruvec, list);
@@ -1857,7 +1876,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
unfreeze_page(head);
for (i = 0; i < HPAGE_PMD_NR; i++) {
- struct page *subpage = head + i;
+ subpage = head + i;
if (subpage == page)
continue;
unlock_page(subpage);
@@ -2014,8 +2033,8 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out;
}
- /* Addidional pins from radix tree */
- extra_pins = HPAGE_PMD_NR;
+ /* Addidional pin from radix tree */
+ extra_pins = 1;
anon_vma = NULL;
i_mmap_lock_read(mapping);
}
@@ -2037,6 +2056,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
if (mlocked)
lru_add_drain();
+ if (mapping && radix_tree_split_preload(HPAGE_PMD_ORDER, 0,
+ GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto unfreeze;
+ }
+
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irqsave(zone_lru_lock(page_zone(head)), flags);
@@ -2046,10 +2071,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
spin_lock(&mapping->tree_lock);
pslot = radix_tree_lookup_slot(&mapping->page_tree,
page_index(head));
- /*
- * Check if the head page is present in radix tree.
- * We assume all tail are present too, if head is there.
- */
+ /* Check if the page is present in radix tree */
if (radix_tree_deref_slot_protected(pslot,
&mapping->tree_lock) != head)
goto fail;
@@ -2064,8 +2086,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
pgdata->split_queue_len--;
list_del(page_deferred_list(head));
}
- if (mapping)
- __dec_node_page_state(page, NR_SHMEM_THPS);
spin_unlock(&pgdata->split_queue_lock);
__split_huge_page(page, list, flags);
ret = 0;
@@ -2079,9 +2099,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
BUG();
}
spin_unlock(&pgdata->split_queue_lock);
-fail: if (mapping)
+fail: if (mapping) {
spin_unlock(&mapping->tree_lock);
+ radix_tree_preload_end();
+ }
spin_unlock_irqrestore(zone_lru_lock(page_zone(head)), flags);
+unfreeze:
unfreeze_page(head);
ret = -EBUSY;
}
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 79c52d0061af..9929414b170c 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1348,10 +1348,8 @@ static void collapse_shmem(struct mm_struct *mm,
break;
}
nr_none += n;
- for (; index < min(iter.index, end); index++) {
- radix_tree_insert(&mapping->page_tree, index,
- new_page + (index % HPAGE_PMD_NR));
- }
+ for (; index < min(iter.index, end); index++)
+ radix_tree_insert(&mapping->page_tree, index, new_page);
/* We are done. */
if (index >= end)
@@ -1420,8 +1418,7 @@ static void collapse_shmem(struct mm_struct *mm,
list_add_tail(&page->lru, &pagelist);
/* Finally, replace with the new page. */
- radix_tree_replace_slot(slot,
- new_page + (index % HPAGE_PMD_NR));
+ radix_tree_replace_slot(slot, new_page);
index++;
continue;
@@ -1438,24 +1435,17 @@ out_unlock:
break;
}
- /*
- * Handle hole in radix tree at the end of the range.
- * This code only triggers if there's nothing in radix tree
- * beyond 'end'.
- */
- if (result == SCAN_SUCCEED && index < end) {
+ if (result == SCAN_SUCCEED) {
int n = end - index;
- if (!shmem_charge(mapping->host, n)) {
+ if (n && !shmem_charge(mapping->host, n)) {
result = SCAN_FAIL;
goto tree_locked;
}
-
- for (; index < end; index++) {
- radix_tree_insert(&mapping->page_tree, index,
- new_page + (index % HPAGE_PMD_NR));
- }
nr_none += n;
+
+ radix_tree_join(&mapping->page_tree, start,
+ HPAGE_PMD_ORDER, new_page);
}
tree_locked:
diff --git a/mm/shmem.c b/mm/shmem.c
index 812a17c6621d..d7f92ac93263 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -540,33 +540,14 @@ static int shmem_add_to_page_cache(struct page *page,
VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
VM_BUG_ON(expected && PageTransHuge(page));
- page_ref_add(page, nr);
+ get_page(page);
page->mapping = mapping;
page->index = index;
spin_lock_irq(&mapping->tree_lock);
- if (PageTransHuge(page)) {
- void __rcu **results;
- pgoff_t idx;
- int i;
-
- error = 0;
- if (radix_tree_gang_lookup_slot(&mapping->page_tree,
- &results, &idx, index, 1) &&
- idx < index + HPAGE_PMD_NR) {
- error = -EEXIST;
- }
-
- if (!error) {
- for (i = 0; i < HPAGE_PMD_NR; i++) {
- error = radix_tree_insert(&mapping->page_tree,
- index + i, page + i);
- VM_BUG_ON(error);
- }
- count_vm_event(THP_FILE_ALLOC);
- }
- } else if (!expected) {
- error = radix_tree_insert(&mapping->page_tree, index, page);
+ if (!expected) {
+ error = __radix_tree_insert(&mapping->page_tree, index,
+ compound_order(page), page);
} else {
error = shmem_radix_tree_replace(mapping, index, expected,
page);
@@ -574,15 +555,17 @@ static int shmem_add_to_page_cache(struct page *page,
if (!error) {
mapping->nrpages += nr;
- if (PageTransHuge(page))
+ if (PageTransHuge(page)) {
+ count_vm_event(THP_FILE_ALLOC);
__inc_node_page_state(page, NR_SHMEM_THPS);
+ }
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr);
__mod_node_page_state(page_pgdat(page), NR_SHMEM, nr);
spin_unlock_irq(&mapping->tree_lock);
} else {
page->mapping = NULL;
spin_unlock_irq(&mapping->tree_lock);
- page_ref_sub(page, nr);
+ put_page(page);
}
return error;
}
@@ -1733,8 +1716,7 @@ alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, info, sbinfo,
PageTransHuge(page));
if (error)
goto unacct;
- error = radix_tree_maybe_preload_order(gfp & GFP_RECLAIM_MASK,
- compound_order(page));
+ error = radix_tree_maybe_preload(gfp & GFP_RECLAIM_MASK);
if (!error) {
error = shmem_add_to_page_cache(page, mapping, hindex,
NULL);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 07/41] mm, shmem: swich huge tmpfs to multi-order radix-tree entries
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We would need to use multi-order radix-tree entires for ext4 and other
filesystems to have coherent view on tags (dirty/towrite) in the tree.
This patch converts huge tmpfs implementation to multi-order entries, so
we will be able to use the same code patch for all filesystems.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 320 +++++++++++++++++++++++++++++++++----------------------
mm/huge_memory.c | 47 +++++---
mm/khugepaged.c | 26 ++---
mm/shmem.c | 36 ++-----
4 files changed, 247 insertions(+), 182 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 3083ded98b15..eca8740d2d02 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -114,7 +114,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
struct page *page, void *shadow)
{
struct radix_tree_node *node;
- int i, nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
+ int nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageTail(page), page);
@@ -132,36 +132,32 @@ static void page_cache_tree_delete(struct address_space *mapping,
}
mapping->nrpages -= nr;
- for (i = 0; i < nr; i++) {
- node = radix_tree_replace_clear_tags(&mapping->page_tree,
- page->index + i, shadow);
- if (!node) {
- VM_BUG_ON_PAGE(nr != 1, page);
- return;
- }
+ node = radix_tree_replace_clear_tags(&mapping->page_tree,
+ page->index, shadow);
+ if (!node)
+ return;
- workingset_node_pages_dec(node);
- if (shadow)
- workingset_node_shadows_inc(node);
- else
- if (__radix_tree_delete_node(&mapping->page_tree, node))
- continue;
+ workingset_node_pages_dec(node);
+ if (shadow)
+ workingset_node_shadows_inc(node);
+ else
+ if (__radix_tree_delete_node(&mapping->page_tree, node))
+ return;
- /*
- * Track node that only contains shadow entries. DAX mappings
- * contain no shadow entries and may contain other exceptional
- * entries so skip those.
- *
- * Avoid acquiring the list_lru lock if already tracked.
- * The list_empty() test is safe as node->private_list is
- * protected by mapping->tree_lock.
- */
- if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
- list_empty(&node->private_list)) {
- node->private_data = mapping;
- list_lru_add(&workingset_shadow_nodes,
- &node->private_list);
- }
+ /*
+ * Track node that only contains shadow entries. DAX mappings
+ * contain no shadow entries and may contain other exceptional
+ * entries so skip those.
+ *
+ * Avoid acquiring the list_lru lock if already tracked.
+ * The list_empty() test is safe as node->private_list is
+ * protected by mapping->tree_lock.
+ */
+ if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
+ list_empty(&node->private_list)) {
+ node->private_data = mapping;
+ list_lru_add(&workingset_shadow_nodes,
+ &node->private_list);
}
}
@@ -264,12 +260,7 @@ void delete_from_page_cache(struct page *page)
if (freepage)
freepage(page);
- if (PageTransHuge(page) && !PageHuge(page)) {
- page_ref_sub(page, HPAGE_PMD_NR);
- VM_BUG_ON_PAGE(page_count(page) <= 0, page);
- } else {
- put_page(page);
- }
+ put_page(page);
}
EXPORT_SYMBOL(delete_from_page_cache);
@@ -1073,7 +1064,7 @@ EXPORT_SYMBOL(page_cache_prev_hole);
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset)
{
void **pagep;
- struct page *head, *page;
+ struct page *page;
rcu_read_lock();
repeat:
@@ -1094,25 +1085,25 @@ repeat:
goto out;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/*
* Has the page moved?
* This is part of the lockless pagecache protocol. See
* include/linux/pagemap.h for details.
*/
if (unlikely(page != *pagep)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(offset - page->index < 0);
+ VM_BUG_ON(offset - page->index >= HPAGE_PMD_NR);
+ page += offset - page->index;
+ }
}
out:
rcu_read_unlock();
@@ -1275,7 +1266,7 @@ unsigned find_get_entries(struct address_space *mapping,
struct page **entries, pgoff_t *indices)
{
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
struct radix_tree_iter iter;
if (!nr_entries)
@@ -1283,7 +1274,10 @@ unsigned find_get_entries(struct address_space *mapping,
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1301,26 +1295,38 @@ repeat:
goto export;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
export:
- indices[ret] = iter.index;
+ indices[ret] = index;
entries[ret] = page;
if (++ret == nr_entries)
break;
+ if (radix_tree_exception(page) || !PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_entries &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++) {
+ indices[ret] = ++index;
+ entries[ret] = ++page;
+ }
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_entries)
+ break;
}
rcu_read_unlock();
return ret;
@@ -1347,14 +1353,17 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
{
struct radix_tree_iter iter;
void **slot;
- unsigned ret = 0;
+ unsigned refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1373,25 +1382,35 @@ repeat:
continue;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
@@ -1410,19 +1429,22 @@ repeat:
*
* find_get_pages_contig() returns the number of pages which were found.
*/
-unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
+unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
unsigned int nr_pages, struct page **pages)
{
struct radix_tree_iter iter;
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
- radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, index) {
- struct page *head, *page;
+ radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, start) {
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
/* The hole, there no reason to continue */
@@ -1442,19 +1464,12 @@ repeat:
break;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
@@ -1463,14 +1478,31 @@ repeat:
* otherwise we can get both false positives and false
* negatives, which is just confusing to the caller.
*/
- if (page->mapping == NULL || page_to_pgoff(page) != iter.index) {
+ if (page->mapping == NULL || page_to_pgoff(page) != index) {
put_page(page);
break;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
return ret;
@@ -1488,20 +1520,23 @@ EXPORT_SYMBOL(find_get_pages_contig);
* Like find_get_pages, except we only return pages which are tagged with
* @tag. We update @index to index the next page for the traversal.
*/
-unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index,
+unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *indexp,
int tag, unsigned int nr_pages, struct page **pages)
{
struct radix_tree_iter iter;
void **slot;
- unsigned ret = 0;
+ unsigned refs, ret = 0;
if (unlikely(!nr_pages))
return 0;
rcu_read_lock();
radix_tree_for_each_tagged(slot, &mapping->page_tree,
- &iter, *index, tag) {
- struct page *head, *page;
+ &iter, *indexp, tag) {
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < *indexp)
+ index = *indexp;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1526,31 +1561,41 @@ repeat:
continue;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
pages[ret] = page;
if (++ret == nr_pages)
break;
+ if (!PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_pages &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++, index++)
+ pages[ret] = ++page;
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_pages)
+ break;
}
rcu_read_unlock();
if (ret)
- *index = pages[ret - 1]->index + 1;
+ *indexp = page_to_pgoff(pages[ret - 1]) + 1;
return ret;
}
@@ -1573,7 +1618,7 @@ unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
struct page **entries, pgoff_t *indices)
{
void **slot;
- unsigned int ret = 0;
+ unsigned int refs, ret = 0;
struct radix_tree_iter iter;
if (!nr_entries)
@@ -1582,7 +1627,10 @@ unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
rcu_read_lock();
radix_tree_for_each_tagged(slot, &mapping->page_tree,
&iter, start, tag) {
- struct page *head, *page;
+ struct page *page;
+ unsigned long index = iter.index;
+ if (index < start)
+ index = start;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -1601,26 +1649,38 @@ repeat:
goto export;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
export:
- indices[ret] = iter.index;
+ indices[ret] = index;
entries[ret] = page;
if (++ret == nr_entries)
break;
+ if (radix_tree_exception(page) || !PageTransCompound(page))
+ continue;
+ for (refs = 0; ret < nr_entries &&
+ (index + 1) % HPAGE_PMD_NR;
+ ret++, refs++) {
+ indices[ret] = ++index;
+ entries[ret] = ++page;
+ }
+ if (refs)
+ page_ref_add(compound_head(page), refs);
+ if (ret == nr_entries)
+ break;
}
rcu_read_unlock();
return ret;
@@ -2202,12 +2262,15 @@ void filemap_map_pages(struct fault_env *fe,
struct address_space *mapping = file->f_mapping;
pgoff_t last_pgoff = start_pgoff;
loff_t size;
- struct page *head, *page;
+ struct page *page;
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
start_pgoff) {
- if (iter.index > end_pgoff)
+ unsigned long index = iter.index;
+ if (index < start_pgoff)
+ index = start_pgoff;
+ if (index > end_pgoff)
break;
repeat:
page = radix_tree_deref_slot(slot);
@@ -2218,25 +2281,26 @@ repeat:
slot = radix_tree_iter_retry(&iter);
continue;
}
+ page = NULL;
goto next;
}
- head = compound_head(page);
- if (!page_cache_get_speculative(head))
+ if (!page_cache_get_speculative(page))
goto repeat;
- /* The page was split under us? */
- if (compound_head(page) != head) {
- put_page(head);
- goto repeat;
- }
-
/* Has the page moved? */
if (unlikely(page != *slot)) {
- put_page(head);
+ put_page(page);
goto repeat;
}
+ /* For multi-order entries, find relevant subpage */
+ if (PageTransHuge(page)) {
+ VM_BUG_ON(index - page->index < 0);
+ VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ page += index - page->index;
+ }
+
if (!PageUptodate(page) ||
PageReadahead(page) ||
PageHWPoison(page))
@@ -2244,20 +2308,20 @@ repeat:
if (!trylock_page(page))
goto skip;
- if (page->mapping != mapping || !PageUptodate(page))
+ if (page_mapping(page) != mapping || !PageUptodate(page))
goto unlock;
size = round_up(i_size_read(mapping->host), PAGE_SIZE);
- if (page->index >= size >> PAGE_SHIFT)
+ if (compound_head(page)->index >= size >> PAGE_SHIFT)
goto unlock;
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
- fe->address += (iter.index - last_pgoff) << PAGE_SHIFT;
+ fe->address += (index - last_pgoff) << PAGE_SHIFT;
if (fe->pte)
- fe->pte += iter.index - last_pgoff;
- last_pgoff = iter.index;
+ fe->pte += index - last_pgoff;
+ last_pgoff = index;
if (alloc_set_pte(fe, NULL, page))
goto unlock;
unlock_page(page);
@@ -2270,8 +2334,14 @@ next:
/* Huge page is mapped? No need to proceed. */
if (pmd_trans_huge(*fe->pmd))
break;
- if (iter.index == end_pgoff)
+ if (index == end_pgoff)
break;
+ if (page && PageTransCompound(page) &&
+ (index & (HPAGE_PMD_NR - 1)) !=
+ HPAGE_PMD_NR - 1) {
+ index++;
+ goto repeat;
+ }
}
rcu_read_unlock();
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2373f0a7d340..7937f723c96e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1819,6 +1819,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
struct page *head = compound_head(page);
struct zone *zone = page_zone(head);
struct lruvec *lruvec;
+ struct page *subpage;
pgoff_t end = -1;
int i;
@@ -1827,8 +1828,26 @@ static void __split_huge_page(struct page *page, struct list_head *list,
/* complete memcg works before add pages to LRU */
mem_cgroup_split_huge_fixup(head);
- if (!PageAnon(page))
- end = DIV_ROUND_UP(i_size_read(head->mapping->host), PAGE_SIZE);
+ if (!PageAnon(head)) {
+ struct address_space *mapping = head->mapping;
+ struct radix_tree_iter iter;
+ void **slot;
+
+ __dec_node_page_state(head, NR_SHMEM_THPS);
+
+ radix_tree_split(&mapping->page_tree, head->index, 0);
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
+ head->index) {
+ if (iter.index >= head->index + HPAGE_PMD_NR)
+ break;
+ subpage = head + iter.index - head->index;
+ radix_tree_replace_slot(slot, subpage);
+ VM_BUG_ON_PAGE(compound_head(subpage) != head, subpage);
+ }
+ radix_tree_preload_end();
+
+ end = DIV_ROUND_UP(i_size_read(mapping->host), PAGE_SIZE);
+ }
for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
__split_huge_page_tail(head, i, lruvec, list);
@@ -1857,7 +1876,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
unfreeze_page(head);
for (i = 0; i < HPAGE_PMD_NR; i++) {
- struct page *subpage = head + i;
+ subpage = head + i;
if (subpage == page)
continue;
unlock_page(subpage);
@@ -2014,8 +2033,8 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out;
}
- /* Addidional pins from radix tree */
- extra_pins = HPAGE_PMD_NR;
+ /* Addidional pin from radix tree */
+ extra_pins = 1;
anon_vma = NULL;
i_mmap_lock_read(mapping);
}
@@ -2037,6 +2056,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
if (mlocked)
lru_add_drain();
+ if (mapping && radix_tree_split_preload(HPAGE_PMD_ORDER, 0,
+ GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto unfreeze;
+ }
+
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irqsave(zone_lru_lock(page_zone(head)), flags);
@@ -2046,10 +2071,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
spin_lock(&mapping->tree_lock);
pslot = radix_tree_lookup_slot(&mapping->page_tree,
page_index(head));
- /*
- * Check if the head page is present in radix tree.
- * We assume all tail are present too, if head is there.
- */
+ /* Check if the page is present in radix tree */
if (radix_tree_deref_slot_protected(pslot,
&mapping->tree_lock) != head)
goto fail;
@@ -2064,8 +2086,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
pgdata->split_queue_len--;
list_del(page_deferred_list(head));
}
- if (mapping)
- __dec_node_page_state(page, NR_SHMEM_THPS);
spin_unlock(&pgdata->split_queue_lock);
__split_huge_page(page, list, flags);
ret = 0;
@@ -2079,9 +2099,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
BUG();
}
spin_unlock(&pgdata->split_queue_lock);
-fail: if (mapping)
+fail: if (mapping) {
spin_unlock(&mapping->tree_lock);
+ radix_tree_preload_end();
+ }
spin_unlock_irqrestore(zone_lru_lock(page_zone(head)), flags);
+unfreeze:
unfreeze_page(head);
ret = -EBUSY;
}
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 79c52d0061af..9929414b170c 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1348,10 +1348,8 @@ static void collapse_shmem(struct mm_struct *mm,
break;
}
nr_none += n;
- for (; index < min(iter.index, end); index++) {
- radix_tree_insert(&mapping->page_tree, index,
- new_page + (index % HPAGE_PMD_NR));
- }
+ for (; index < min(iter.index, end); index++)
+ radix_tree_insert(&mapping->page_tree, index, new_page);
/* We are done. */
if (index >= end)
@@ -1420,8 +1418,7 @@ static void collapse_shmem(struct mm_struct *mm,
list_add_tail(&page->lru, &pagelist);
/* Finally, replace with the new page. */
- radix_tree_replace_slot(slot,
- new_page + (index % HPAGE_PMD_NR));
+ radix_tree_replace_slot(slot, new_page);
index++;
continue;
@@ -1438,24 +1435,17 @@ out_unlock:
break;
}
- /*
- * Handle hole in radix tree at the end of the range.
- * This code only triggers if there's nothing in radix tree
- * beyond 'end'.
- */
- if (result == SCAN_SUCCEED && index < end) {
+ if (result == SCAN_SUCCEED) {
int n = end - index;
- if (!shmem_charge(mapping->host, n)) {
+ if (n && !shmem_charge(mapping->host, n)) {
result = SCAN_FAIL;
goto tree_locked;
}
-
- for (; index < end; index++) {
- radix_tree_insert(&mapping->page_tree, index,
- new_page + (index % HPAGE_PMD_NR));
- }
nr_none += n;
+
+ radix_tree_join(&mapping->page_tree, start,
+ HPAGE_PMD_ORDER, new_page);
}
tree_locked:
diff --git a/mm/shmem.c b/mm/shmem.c
index 812a17c6621d..d7f92ac93263 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -540,33 +540,14 @@ static int shmem_add_to_page_cache(struct page *page,
VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
VM_BUG_ON(expected && PageTransHuge(page));
- page_ref_add(page, nr);
+ get_page(page);
page->mapping = mapping;
page->index = index;
spin_lock_irq(&mapping->tree_lock);
- if (PageTransHuge(page)) {
- void __rcu **results;
- pgoff_t idx;
- int i;
-
- error = 0;
- if (radix_tree_gang_lookup_slot(&mapping->page_tree,
- &results, &idx, index, 1) &&
- idx < index + HPAGE_PMD_NR) {
- error = -EEXIST;
- }
-
- if (!error) {
- for (i = 0; i < HPAGE_PMD_NR; i++) {
- error = radix_tree_insert(&mapping->page_tree,
- index + i, page + i);
- VM_BUG_ON(error);
- }
- count_vm_event(THP_FILE_ALLOC);
- }
- } else if (!expected) {
- error = radix_tree_insert(&mapping->page_tree, index, page);
+ if (!expected) {
+ error = __radix_tree_insert(&mapping->page_tree, index,
+ compound_order(page), page);
} else {
error = shmem_radix_tree_replace(mapping, index, expected,
page);
@@ -574,15 +555,17 @@ static int shmem_add_to_page_cache(struct page *page,
if (!error) {
mapping->nrpages += nr;
- if (PageTransHuge(page))
+ if (PageTransHuge(page)) {
+ count_vm_event(THP_FILE_ALLOC);
__inc_node_page_state(page, NR_SHMEM_THPS);
+ }
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr);
__mod_node_page_state(page_pgdat(page), NR_SHMEM, nr);
spin_unlock_irq(&mapping->tree_lock);
} else {
page->mapping = NULL;
spin_unlock_irq(&mapping->tree_lock);
- page_ref_sub(page, nr);
+ put_page(page);
}
return error;
}
@@ -1733,8 +1716,7 @@ alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, info, sbinfo,
PageTransHuge(page));
if (error)
goto unacct;
- error = radix_tree_maybe_preload_order(gfp & GFP_RECLAIM_MASK,
- compound_order(page));
+ error = radix_tree_maybe_preload(gfp & GFP_RECLAIM_MASK);
if (!error) {
error = shmem_add_to_page_cache(page, mapping, hindex,
NULL);
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 08/41] Revert "radix-tree: implement radix_tree_maybe_preload_order()"
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This reverts commit 356e1c23292a4f63cfdf1daf0e0ddada51f32de8.
After conversion of huge tmpfs to multi-order entries, we don't need
this anymore.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 1 -
lib/radix-tree.c | 74 ----------------------------------------------
2 files changed, 75 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index c4cea311d901..7a271f662320 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -290,7 +290,6 @@ unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root,
unsigned long first_index, unsigned int max_items);
int radix_tree_preload(gfp_t gfp_mask);
int radix_tree_maybe_preload(gfp_t gfp_mask);
-int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order);
void radix_tree_init(void);
void *radix_tree_tag_set(struct radix_tree_root *root,
unsigned long index, unsigned int tag);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 89092c4011b8..aa23643814a5 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -38,9 +38,6 @@
#include <linux/preempt.h> /* in_interrupt() */
-/* Number of nodes in fully populated tree of given height */
-static unsigned long height_to_maxnodes[RADIX_TREE_MAX_PATH + 1] __read_mostly;
-
/*
* Radix tree node cache.
*/
@@ -427,51 +424,6 @@ int radix_tree_split_preload(unsigned int old_order, unsigned int new_order,
#endif
/*
- * The same as function above, but preload number of nodes required to insert
- * (1 << order) continuous naturally-aligned elements.
- */
-int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order)
-{
- unsigned long nr_subtrees;
- int nr_nodes, subtree_height;
-
- /* Preloading doesn't help anything with this gfp mask, skip it */
- if (!gfpflags_allow_blocking(gfp_mask)) {
- preempt_disable();
- return 0;
- }
-
- /*
- * Calculate number and height of fully populated subtrees it takes to
- * store (1 << order) elements.
- */
- nr_subtrees = 1 << order;
- for (subtree_height = 0; nr_subtrees > RADIX_TREE_MAP_SIZE;
- subtree_height++)
- nr_subtrees >>= RADIX_TREE_MAP_SHIFT;
-
- /*
- * The worst case is zero height tree with a single item at index 0 and
- * then inserting items starting at ULONG_MAX - (1 << order).
- *
- * This requires RADIX_TREE_MAX_PATH nodes to build branch from root to
- * 0-index item.
- */
- nr_nodes = RADIX_TREE_MAX_PATH;
-
- /* Plus branch to fully populated subtrees. */
- nr_nodes += RADIX_TREE_MAX_PATH - subtree_height;
-
- /* Root node is shared. */
- nr_nodes--;
-
- /* Plus nodes required to build subtrees. */
- nr_nodes += nr_subtrees * height_to_maxnodes[subtree_height];
-
- return __radix_tree_preload(gfp_mask, nr_nodes);
-}
-
-/*
* The maximum index which can be stored in a radix tree
*/
static inline unsigned long shift_maxindex(unsigned int shift)
@@ -1850,31 +1802,6 @@ radix_tree_node_ctor(void *arg)
INIT_LIST_HEAD(&node->private_list);
}
-static __init unsigned long __maxindex(unsigned int height)
-{
- unsigned int width = height * RADIX_TREE_MAP_SHIFT;
- int shift = RADIX_TREE_INDEX_BITS - width;
-
- if (shift < 0)
- return ~0UL;
- if (shift >= BITS_PER_LONG)
- return 0UL;
- return ~0UL >> shift;
-}
-
-static __init void radix_tree_init_maxnodes(void)
-{
- unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH + 1];
- unsigned int i, j;
-
- for (i = 0; i < ARRAY_SIZE(height_to_maxindex); i++)
- height_to_maxindex[i] = __maxindex(i);
- for (i = 0; i < ARRAY_SIZE(height_to_maxnodes); i++) {
- for (j = i; j > 0; j--)
- height_to_maxnodes[i] += height_to_maxindex[j - 1] + 1;
- }
-}
-
static int radix_tree_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -1901,6 +1828,5 @@ void __init radix_tree_init(void)
sizeof(struct radix_tree_node), 0,
SLAB_PANIC | SLAB_RECLAIM_ACCOUNT,
radix_tree_node_ctor);
- radix_tree_init_maxnodes();
hotcpu_notifier(radix_tree_callback, 0);
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 08/41] Revert "radix-tree: implement radix_tree_maybe_preload_order()"
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This reverts commit 356e1c23292a4f63cfdf1daf0e0ddada51f32de8.
After conversion of huge tmpfs to multi-order entries, we don't need
this anymore.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/radix-tree.h | 1 -
lib/radix-tree.c | 74 ----------------------------------------------
2 files changed, 75 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index c4cea311d901..7a271f662320 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -290,7 +290,6 @@ unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root,
unsigned long first_index, unsigned int max_items);
int radix_tree_preload(gfp_t gfp_mask);
int radix_tree_maybe_preload(gfp_t gfp_mask);
-int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order);
void radix_tree_init(void);
void *radix_tree_tag_set(struct radix_tree_root *root,
unsigned long index, unsigned int tag);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 89092c4011b8..aa23643814a5 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -38,9 +38,6 @@
#include <linux/preempt.h> /* in_interrupt() */
-/* Number of nodes in fully populated tree of given height */
-static unsigned long height_to_maxnodes[RADIX_TREE_MAX_PATH + 1] __read_mostly;
-
/*
* Radix tree node cache.
*/
@@ -427,51 +424,6 @@ int radix_tree_split_preload(unsigned int old_order, unsigned int new_order,
#endif
/*
- * The same as function above, but preload number of nodes required to insert
- * (1 << order) continuous naturally-aligned elements.
- */
-int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order)
-{
- unsigned long nr_subtrees;
- int nr_nodes, subtree_height;
-
- /* Preloading doesn't help anything with this gfp mask, skip it */
- if (!gfpflags_allow_blocking(gfp_mask)) {
- preempt_disable();
- return 0;
- }
-
- /*
- * Calculate number and height of fully populated subtrees it takes to
- * store (1 << order) elements.
- */
- nr_subtrees = 1 << order;
- for (subtree_height = 0; nr_subtrees > RADIX_TREE_MAP_SIZE;
- subtree_height++)
- nr_subtrees >>= RADIX_TREE_MAP_SHIFT;
-
- /*
- * The worst case is zero height tree with a single item at index 0 and
- * then inserting items starting at ULONG_MAX - (1 << order).
- *
- * This requires RADIX_TREE_MAX_PATH nodes to build branch from root to
- * 0-index item.
- */
- nr_nodes = RADIX_TREE_MAX_PATH;
-
- /* Plus branch to fully populated subtrees. */
- nr_nodes += RADIX_TREE_MAX_PATH - subtree_height;
-
- /* Root node is shared. */
- nr_nodes--;
-
- /* Plus nodes required to build subtrees. */
- nr_nodes += nr_subtrees * height_to_maxnodes[subtree_height];
-
- return __radix_tree_preload(gfp_mask, nr_nodes);
-}
-
-/*
* The maximum index which can be stored in a radix tree
*/
static inline unsigned long shift_maxindex(unsigned int shift)
@@ -1850,31 +1802,6 @@ radix_tree_node_ctor(void *arg)
INIT_LIST_HEAD(&node->private_list);
}
-static __init unsigned long __maxindex(unsigned int height)
-{
- unsigned int width = height * RADIX_TREE_MAP_SHIFT;
- int shift = RADIX_TREE_INDEX_BITS - width;
-
- if (shift < 0)
- return ~0UL;
- if (shift >= BITS_PER_LONG)
- return 0UL;
- return ~0UL >> shift;
-}
-
-static __init void radix_tree_init_maxnodes(void)
-{
- unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH + 1];
- unsigned int i, j;
-
- for (i = 0; i < ARRAY_SIZE(height_to_maxindex); i++)
- height_to_maxindex[i] = __maxindex(i);
- for (i = 0; i < ARRAY_SIZE(height_to_maxnodes); i++) {
- for (j = i; j > 0; j--)
- height_to_maxnodes[i] += height_to_maxindex[j - 1] + 1;
- }
-}
-
static int radix_tree_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -1901,6 +1828,5 @@ void __init radix_tree_init(void)
sizeof(struct radix_tree_node), 0,
SLAB_PANIC | SLAB_RECLAIM_ACCOUNT,
radix_tree_node_ctor);
- radix_tree_init_maxnodes();
hotcpu_notifier(radix_tree_callback, 0);
}
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 09/41] page-flags: relax page flag policy for few flags
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
These flags are in use for filesystems with backing storage: PG_error,
PG_writeback and PG_readahead.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/page-flags.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 74e4dda91238..a2bef9a41bcf 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -253,7 +253,7 @@ static inline int TestClearPage##uname(struct page *page) { return 0; }
TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname)
__PAGEFLAG(Locked, locked, PF_NO_TAIL)
-PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND)
+PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL)
PAGEFLAG(Referenced, referenced, PF_HEAD)
TESTCLEARFLAG(Referenced, referenced, PF_HEAD)
__SETPAGEFLAG(Referenced, referenced, PF_HEAD)
@@ -293,15 +293,15 @@ PAGEFLAG(OwnerPriv1, owner_priv_1, PF_ANY)
* Only test-and-set exist for PG_writeback. The unconditional operators are
* risky: they bypass page accounting.
*/
-TESTPAGEFLAG(Writeback, writeback, PF_NO_COMPOUND)
- TESTSCFLAG(Writeback, writeback, PF_NO_COMPOUND)
+TESTPAGEFLAG(Writeback, writeback, PF_NO_TAIL)
+ TESTSCFLAG(Writeback, writeback, PF_NO_TAIL)
PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_TAIL)
/* PG_readahead is only used for reads; PG_reclaim is only for writes */
PAGEFLAG(Reclaim, reclaim, PF_NO_TAIL)
TESTCLEARFLAG(Reclaim, reclaim, PF_NO_TAIL)
-PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND)
- TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND)
+PAGEFLAG(Readahead, reclaim, PF_NO_TAIL)
+ TESTCLEARFLAG(Readahead, reclaim, PF_NO_TAIL)
#ifdef CONFIG_HIGHMEM
/*
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 09/41] page-flags: relax page flag policy for few flags
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
These flags are in use for filesystems with backing storage: PG_error,
PG_writeback and PG_readahead.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/page-flags.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 74e4dda91238..a2bef9a41bcf 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -253,7 +253,7 @@ static inline int TestClearPage##uname(struct page *page) { return 0; }
TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname)
__PAGEFLAG(Locked, locked, PF_NO_TAIL)
-PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND)
+PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL)
PAGEFLAG(Referenced, referenced, PF_HEAD)
TESTCLEARFLAG(Referenced, referenced, PF_HEAD)
__SETPAGEFLAG(Referenced, referenced, PF_HEAD)
@@ -293,15 +293,15 @@ PAGEFLAG(OwnerPriv1, owner_priv_1, PF_ANY)
* Only test-and-set exist for PG_writeback. The unconditional operators are
* risky: they bypass page accounting.
*/
-TESTPAGEFLAG(Writeback, writeback, PF_NO_COMPOUND)
- TESTSCFLAG(Writeback, writeback, PF_NO_COMPOUND)
+TESTPAGEFLAG(Writeback, writeback, PF_NO_TAIL)
+ TESTSCFLAG(Writeback, writeback, PF_NO_TAIL)
PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_TAIL)
/* PG_readahead is only used for reads; PG_reclaim is only for writes */
PAGEFLAG(Reclaim, reclaim, PF_NO_TAIL)
TESTCLEARFLAG(Reclaim, reclaim, PF_NO_TAIL)
-PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND)
- TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND)
+PAGEFLAG(Readahead, reclaim, PF_NO_TAIL)
+ TESTCLEARFLAG(Readahead, reclaim, PF_NO_TAIL)
#ifdef CONFIG_HIGHMEM
/*
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 10/41] mm, rmap: account file thp pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Let's add FileHugePages and FilePmdMapped fields into meminfo and smaps.
It indicates how many times we allocate and map file THP.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/base/node.c | 6 ++++++
fs/proc/meminfo.c | 4 ++++
fs/proc/task_mmu.c | 5 ++++-
include/linux/mmzone.h | 2 ++
mm/filemap.c | 3 ++-
mm/huge_memory.c | 5 ++++-
mm/page_alloc.c | 5 +++++
mm/rmap.c | 12 ++++++++----
mm/vmstat.c | 2 ++
9 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 5548f9686016..45be0ddb84ed 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -116,6 +116,8 @@ static ssize_t node_read_meminfo(struct device *dev,
"Node %d AnonHugePages: %8lu kB\n"
"Node %d ShmemHugePages: %8lu kB\n"
"Node %d ShmemPmdMapped: %8lu kB\n"
+ "Node %d FileHugePages: %8lu kB\n"
+ "Node %d FilePmdMapped: %8lu kB\n"
#endif
,
nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
@@ -139,6 +141,10 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
+ HPAGE_PMD_NR),
+ nid, K(node_page_state(pgdat, NR_FILE_THPS) *
+ HPAGE_PMD_NR),
+ nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
HPAGE_PMD_NR));
#else
nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 09e18fdf61e5..201a060f2c6c 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -107,6 +107,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
"AnonHugePages: %8lu kB\n"
"ShmemHugePages: %8lu kB\n"
"ShmemPmdMapped: %8lu kB\n"
+ "FileHugePages: %8lu kB\n"
+ "FilePmdMapped: %8lu kB\n"
#endif
#ifdef CONFIG_CMA
"CmaTotal: %8lu kB\n"
@@ -167,6 +169,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
, K(global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR)
, K(global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR)
, K(global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR)
+ , K(global_node_page_state(NR_FILE_THPS) * HPAGE_PMD_NR)
+ , K(global_node_page_state(NR_FILE_PMDMAPPED) * HPAGE_PMD_NR)
#endif
#ifdef CONFIG_CMA
, K(totalcma_pages)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 187d84ef9de9..de698238a451 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -449,6 +449,7 @@ struct mem_size_stats {
unsigned long anonymous;
unsigned long anonymous_thp;
unsigned long shmem_thp;
+ unsigned long file_thp;
unsigned long swap;
unsigned long shared_hugetlb;
unsigned long private_hugetlb;
@@ -582,7 +583,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
else if (PageSwapBacked(page))
mss->shmem_thp += HPAGE_PMD_SIZE;
else
- VM_BUG_ON_PAGE(1, page);
+ mss->file_thp += HPAGE_PMD_SIZE;
smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
}
#else
@@ -777,6 +778,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
"Anonymous: %8lu kB\n"
"AnonHugePages: %8lu kB\n"
"ShmemPmdMapped: %8lu kB\n"
+ "FilePmdMapped: %8lu kB\n"
"Shared_Hugetlb: %8lu kB\n"
"Private_Hugetlb: %7lu kB\n"
"Swap: %8lu kB\n"
@@ -795,6 +797,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
mss.anonymous >> 10,
mss.anonymous_thp >> 10,
mss.shmem_thp >> 10,
+ mss.file_thp >> 10,
mss.shared_hugetlb >> 10,
mss.private_hugetlb >> 10,
mss.swap >> 10,
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d572b78b65e1..181c94df965a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -163,6 +163,8 @@ enum node_stat_item {
NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */
NR_SHMEM_THPS,
NR_SHMEM_PMDMAPPED,
+ NR_FILE_THPS,
+ NR_FILE_PMDMAPPED,
NR_ANON_THPS,
NR_UNSTABLE_NFS, /* NFS unstable pages */
NR_VMSCAN_WRITE,
diff --git a/mm/filemap.c b/mm/filemap.c
index eca8740d2d02..f2640fe345dd 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -220,7 +220,8 @@ void __delete_from_page_cache(struct page *page, void *shadow)
if (PageTransHuge(page))
__dec_node_page_state(page, NR_SHMEM_THPS);
} else {
- VM_BUG_ON_PAGE(PageTransHuge(page) && !PageHuge(page), page);
+ if (PageTransHuge(page) && !PageHuge(page))
+ __dec_node_page_state(page, NR_FILE_THPS);
}
/*
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7937f723c96e..73e80d49c32e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1833,7 +1833,10 @@ static void __split_huge_page(struct page *page, struct list_head *list,
struct radix_tree_iter iter;
void **slot;
- __dec_node_page_state(head, NR_SHMEM_THPS);
+ if (PageSwapBacked(page))
+ __dec_node_page_state(page, NR_SHMEM_THPS);
+ else
+ __dec_node_page_state(page, NR_FILE_THPS);
radix_tree_split(&mapping->page_tree, head->index, 0);
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ee5a4b20daf4..af9b73563da9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4290,6 +4290,8 @@ void show_free_areas(unsigned int filter)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
" shmem_thp: %lukB"
" shmem_pmdmapped: %lukB"
+ " file_thp: %lukB"
+ " file_pmdmapped: %lukB"
" anon_thp: %lukB"
#endif
" writeback_tmp:%lukB"
@@ -4312,6 +4314,9 @@ void show_free_areas(unsigned int filter)
K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)
* HPAGE_PMD_NR),
+ K(node_page_state(pgdat, NR_FILE_THPS) * HPAGE_PMD_NR),
+ K(node_page_state(pgdat, NR_FILE_PMDMAPPED)
+ * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR),
#endif
K(node_page_state(pgdat, NR_SHMEM)),
diff --git a/mm/rmap.c b/mm/rmap.c
index d4f56060ba3f..f071d6f7a986 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1281,8 +1281,10 @@ void page_add_file_rmap(struct page *page, bool compound)
}
if (!atomic_inc_and_test(compound_mapcount_ptr(page)))
goto out;
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
- __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ if (PageSwapBacked(page))
+ __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ else
+ __inc_node_page_state(page, NR_FILE_PMDMAPPED);
} else {
if (PageTransCompound(page) && page_mapping(page)) {
VM_WARN_ON_ONCE(!PageLocked(page));
@@ -1322,8 +1324,10 @@ static void page_remove_file_rmap(struct page *page, bool compound)
}
if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
goto out;
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
- __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ if (PageSwapBacked(page))
+ __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ else
+ __dec_node_page_state(page, NR_FILE_PMDMAPPED);
} else {
if (!atomic_add_negative(-1, &page->_mapcount))
goto out;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 84397e8eca54..714c91728ddd 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -967,6 +967,8 @@ const char * const vmstat_text[] = {
"nr_shmem",
"nr_shmem_hugepages",
"nr_shmem_pmdmapped",
+ "nr_file_hugepaged",
+ "nr_file_pmdmapped",
"nr_anon_transparent_hugepages",
"nr_unstable",
"nr_vmscan_write",
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 10/41] mm, rmap: account file thp pages
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Let's add FileHugePages and FilePmdMapped fields into meminfo and smaps.
It indicates how many times we allocate and map file THP.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/base/node.c | 6 ++++++
fs/proc/meminfo.c | 4 ++++
fs/proc/task_mmu.c | 5 ++++-
include/linux/mmzone.h | 2 ++
mm/filemap.c | 3 ++-
mm/huge_memory.c | 5 ++++-
mm/page_alloc.c | 5 +++++
mm/rmap.c | 12 ++++++++----
mm/vmstat.c | 2 ++
9 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 5548f9686016..45be0ddb84ed 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -116,6 +116,8 @@ static ssize_t node_read_meminfo(struct device *dev,
"Node %d AnonHugePages: %8lu kB\n"
"Node %d ShmemHugePages: %8lu kB\n"
"Node %d ShmemPmdMapped: %8lu kB\n"
+ "Node %d FileHugePages: %8lu kB\n"
+ "Node %d FilePmdMapped: %8lu kB\n"
#endif
,
nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
@@ -139,6 +141,10 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
+ HPAGE_PMD_NR),
+ nid, K(node_page_state(pgdat, NR_FILE_THPS) *
+ HPAGE_PMD_NR),
+ nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
HPAGE_PMD_NR));
#else
nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 09e18fdf61e5..201a060f2c6c 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -107,6 +107,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
"AnonHugePages: %8lu kB\n"
"ShmemHugePages: %8lu kB\n"
"ShmemPmdMapped: %8lu kB\n"
+ "FileHugePages: %8lu kB\n"
+ "FilePmdMapped: %8lu kB\n"
#endif
#ifdef CONFIG_CMA
"CmaTotal: %8lu kB\n"
@@ -167,6 +169,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
, K(global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR)
, K(global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR)
, K(global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR)
+ , K(global_node_page_state(NR_FILE_THPS) * HPAGE_PMD_NR)
+ , K(global_node_page_state(NR_FILE_PMDMAPPED) * HPAGE_PMD_NR)
#endif
#ifdef CONFIG_CMA
, K(totalcma_pages)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 187d84ef9de9..de698238a451 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -449,6 +449,7 @@ struct mem_size_stats {
unsigned long anonymous;
unsigned long anonymous_thp;
unsigned long shmem_thp;
+ unsigned long file_thp;
unsigned long swap;
unsigned long shared_hugetlb;
unsigned long private_hugetlb;
@@ -582,7 +583,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
else if (PageSwapBacked(page))
mss->shmem_thp += HPAGE_PMD_SIZE;
else
- VM_BUG_ON_PAGE(1, page);
+ mss->file_thp += HPAGE_PMD_SIZE;
smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
}
#else
@@ -777,6 +778,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
"Anonymous: %8lu kB\n"
"AnonHugePages: %8lu kB\n"
"ShmemPmdMapped: %8lu kB\n"
+ "FilePmdMapped: %8lu kB\n"
"Shared_Hugetlb: %8lu kB\n"
"Private_Hugetlb: %7lu kB\n"
"Swap: %8lu kB\n"
@@ -795,6 +797,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
mss.anonymous >> 10,
mss.anonymous_thp >> 10,
mss.shmem_thp >> 10,
+ mss.file_thp >> 10,
mss.shared_hugetlb >> 10,
mss.private_hugetlb >> 10,
mss.swap >> 10,
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d572b78b65e1..181c94df965a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -163,6 +163,8 @@ enum node_stat_item {
NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */
NR_SHMEM_THPS,
NR_SHMEM_PMDMAPPED,
+ NR_FILE_THPS,
+ NR_FILE_PMDMAPPED,
NR_ANON_THPS,
NR_UNSTABLE_NFS, /* NFS unstable pages */
NR_VMSCAN_WRITE,
diff --git a/mm/filemap.c b/mm/filemap.c
index eca8740d2d02..f2640fe345dd 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -220,7 +220,8 @@ void __delete_from_page_cache(struct page *page, void *shadow)
if (PageTransHuge(page))
__dec_node_page_state(page, NR_SHMEM_THPS);
} else {
- VM_BUG_ON_PAGE(PageTransHuge(page) && !PageHuge(page), page);
+ if (PageTransHuge(page) && !PageHuge(page))
+ __dec_node_page_state(page, NR_FILE_THPS);
}
/*
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7937f723c96e..73e80d49c32e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1833,7 +1833,10 @@ static void __split_huge_page(struct page *page, struct list_head *list,
struct radix_tree_iter iter;
void **slot;
- __dec_node_page_state(head, NR_SHMEM_THPS);
+ if (PageSwapBacked(page))
+ __dec_node_page_state(page, NR_SHMEM_THPS);
+ else
+ __dec_node_page_state(page, NR_FILE_THPS);
radix_tree_split(&mapping->page_tree, head->index, 0);
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ee5a4b20daf4..af9b73563da9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4290,6 +4290,8 @@ void show_free_areas(unsigned int filter)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
" shmem_thp: %lukB"
" shmem_pmdmapped: %lukB"
+ " file_thp: %lukB"
+ " file_pmdmapped: %lukB"
" anon_thp: %lukB"
#endif
" writeback_tmp:%lukB"
@@ -4312,6 +4314,9 @@ void show_free_areas(unsigned int filter)
K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)
* HPAGE_PMD_NR),
+ K(node_page_state(pgdat, NR_FILE_THPS) * HPAGE_PMD_NR),
+ K(node_page_state(pgdat, NR_FILE_PMDMAPPED)
+ * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR),
#endif
K(node_page_state(pgdat, NR_SHMEM)),
diff --git a/mm/rmap.c b/mm/rmap.c
index d4f56060ba3f..f071d6f7a986 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1281,8 +1281,10 @@ void page_add_file_rmap(struct page *page, bool compound)
}
if (!atomic_inc_and_test(compound_mapcount_ptr(page)))
goto out;
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
- __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ if (PageSwapBacked(page))
+ __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ else
+ __inc_node_page_state(page, NR_FILE_PMDMAPPED);
} else {
if (PageTransCompound(page) && page_mapping(page)) {
VM_WARN_ON_ONCE(!PageLocked(page));
@@ -1322,8 +1324,10 @@ static void page_remove_file_rmap(struct page *page, bool compound)
}
if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
goto out;
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
- __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ if (PageSwapBacked(page))
+ __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+ else
+ __dec_node_page_state(page, NR_FILE_PMDMAPPED);
} else {
if (!atomic_add_negative(-1, &page->_mapcount))
goto out;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 84397e8eca54..714c91728ddd 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -967,6 +967,8 @@ const char * const vmstat_text[] = {
"nr_shmem",
"nr_shmem_hugepages",
"nr_shmem_pmdmapped",
+ "nr_file_hugepaged",
+ "nr_file_pmdmapped",
"nr_anon_transparent_hugepages",
"nr_unstable",
"nr_vmscan_write",
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 11/41] thp: try to free page's buffers before attempt split
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We want page to be isolated from the rest of the system before spliting
it. We rely on page count to be 2 for file pages to make sure nobody
uses the page: one pin to caller, one to radix-tree.
Filesystems with backing storage can have page count increased if it has
buffers.
Let's try to free them, before attempt split. And remove one guarding
VM_BUG_ON_PAGE().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/buffer_head.h | 1 +
mm/huge_memory.c | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index ebbacd14d450..006a8a42acfb 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -395,6 +395,7 @@ extern int __set_page_dirty_buffers(struct page *page);
#else /* CONFIG_BLOCK */
static inline void buffer_init(void) {}
+static inline int page_has_buffers(struct page *page) { return 0; }
static inline int try_to_free_buffers(struct page *page) { return 1; }
static inline int inode_has_buffers(struct inode *inode) { return 0; }
static inline void invalidate_inode_buffers(struct inode *inode) {}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 73e80d49c32e..a8fcfa3010c8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -30,6 +30,7 @@
#include <linux/userfaultfd_k.h>
#include <linux/page_idle.h>
#include <linux/shmem_fs.h>
+#include <linux/buffer_head.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
@@ -2007,7 +2008,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
VM_BUG_ON_PAGE(is_huge_zero_page(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
VM_BUG_ON_PAGE(!PageCompound(page), page);
if (PageAnon(head)) {
@@ -2036,6 +2036,23 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out;
}
+ /* Try to free buffers before attempt split */
+ if (!PageSwapBacked(head) && PagePrivate(page)) {
+ /*
+ * We cannot trigger writeback from here due possible
+ * recursion if triggered from vmscan, only wait.
+ *
+ * Caller can trigger writeback it on its own, if safe.
+ */
+ wait_on_page_writeback(head);
+
+ if (page_has_buffers(head) &&
+ !try_to_free_buffers(head)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ }
+
/* Addidional pin from radix tree */
extra_pins = 1;
anon_vma = NULL;
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 11/41] thp: try to free page's buffers before attempt split
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We want page to be isolated from the rest of the system before spliting
it. We rely on page count to be 2 for file pages to make sure nobody
uses the page: one pin to caller, one to radix-tree.
Filesystems with backing storage can have page count increased if it has
buffers.
Let's try to free them, before attempt split. And remove one guarding
VM_BUG_ON_PAGE().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/buffer_head.h | 1 +
mm/huge_memory.c | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index ebbacd14d450..006a8a42acfb 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -395,6 +395,7 @@ extern int __set_page_dirty_buffers(struct page *page);
#else /* CONFIG_BLOCK */
static inline void buffer_init(void) {}
+static inline int page_has_buffers(struct page *page) { return 0; }
static inline int try_to_free_buffers(struct page *page) { return 1; }
static inline int inode_has_buffers(struct inode *inode) { return 0; }
static inline void invalidate_inode_buffers(struct inode *inode) {}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 73e80d49c32e..a8fcfa3010c8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -30,6 +30,7 @@
#include <linux/userfaultfd_k.h>
#include <linux/page_idle.h>
#include <linux/shmem_fs.h>
+#include <linux/buffer_head.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
@@ -2007,7 +2008,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
VM_BUG_ON_PAGE(is_huge_zero_page(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
VM_BUG_ON_PAGE(!PageCompound(page), page);
if (PageAnon(head)) {
@@ -2036,6 +2036,23 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out;
}
+ /* Try to free buffers before attempt split */
+ if (!PageSwapBacked(head) && PagePrivate(page)) {
+ /*
+ * We cannot trigger writeback from here due possible
+ * recursion if triggered from vmscan, only wait.
+ *
+ * Caller can trigger writeback it on its own, if safe.
+ */
+ wait_on_page_writeback(head);
+
+ if (page_has_buffers(head) &&
+ !try_to_free_buffers(head)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ }
+
/* Addidional pin from radix tree */
extra_pins = 1;
anon_vma = NULL;
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 12/41] thp: handle write-protection faults for file THP
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For filesystems that wants to be write-notified (has mkwrite), we will
encount write-protection faults for huge PMDs in shared mappings.
The easiest way to handle them is to clear the PMD and let it refault as
wriable.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/memory.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c
index 4425b6059339..5b7f0ce44a27 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3448,8 +3448,17 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd,
fe->flags);
+ if (fe->vma->vm_flags & VM_SHARED) {
+ /* Clear PMD */
+ zap_page_range_single(fe->vma, fe->address,
+ HPAGE_PMD_SIZE, NULL);
+ VM_BUG_ON(!pmd_none(*fe->pmd));
+
+ /* Refault to establish writable PMD */
+ return 0;
+ }
+
/* COW handled on pte level: split pmd */
- VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma);
split_huge_pmd(fe->vma, fe->pmd, fe->address);
return VM_FAULT_FALLBACK;
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 12/41] thp: handle write-protection faults for file THP
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For filesystems that wants to be write-notified (has mkwrite), we will
encount write-protection faults for huge PMDs in shared mappings.
The easiest way to handle them is to clear the PMD and let it refault as
wriable.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/memory.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c
index 4425b6059339..5b7f0ce44a27 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3448,8 +3448,17 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd,
fe->flags);
+ if (fe->vma->vm_flags & VM_SHARED) {
+ /* Clear PMD */
+ zap_page_range_single(fe->vma, fe->address,
+ HPAGE_PMD_SIZE, NULL);
+ VM_BUG_ON(!pmd_none(*fe->pmd));
+
+ /* Refault to establish writable PMD */
+ return 0;
+ }
+
/* COW handled on pte level: split pmd */
- VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma);
split_huge_pmd(fe->vma, fe->pmd, fe->address);
return VM_FAULT_FALLBACK;
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 13/41] truncate: make sure invalidate_mapping_pages() can discard huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
invalidate_inode_page() has expectation about page_count() of the page
-- if it's not 2 (one to caller, one to radix-tree), it will not be
dropped. That condition almost never met for THPs -- tail pages are
pinned to the pagevec.
Let's drop them, before calling invalidate_inode_page().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/truncate.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/mm/truncate.c b/mm/truncate.c
index a01cce450a26..ce904e4b1708 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -504,10 +504,21 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
/* 'end' is in the middle of THP */
if (index == round_down(end, HPAGE_PMD_NR))
continue;
+ /*
+ * invalidate_inode_page() expects
+ * page_count(page) == 2 to drop page from page
+ * cache -- drop tail pages references.
+ */
+ get_page(page);
+ pagevec_release(&pvec);
}
ret = invalidate_inode_page(page);
unlock_page(page);
+
+ if (PageTransHuge(page))
+ put_page(page);
+
/*
* Invalidation is a hint that the page is no longer
* of interest and try to speed up its reclaim.
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 13/41] truncate: make sure invalidate_mapping_pages() can discard huge pages
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
invalidate_inode_page() has expectation about page_count() of the page
-- if it's not 2 (one to caller, one to radix-tree), it will not be
dropped. That condition almost never met for THPs -- tail pages are
pinned to the pagevec.
Let's drop them, before calling invalidate_inode_page().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/truncate.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/mm/truncate.c b/mm/truncate.c
index a01cce450a26..ce904e4b1708 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -504,10 +504,21 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
/* 'end' is in the middle of THP */
if (index == round_down(end, HPAGE_PMD_NR))
continue;
+ /*
+ * invalidate_inode_page() expects
+ * page_count(page) == 2 to drop page from page
+ * cache -- drop tail pages references.
+ */
+ get_page(page);
+ pagevec_release(&pvec);
}
ret = invalidate_inode_page(page);
unlock_page(page);
+
+ if (PageTransHuge(page))
+ put_page(page);
+
/*
* Invalidation is a hint that the page is no longer
* of interest and try to speed up its reclaim.
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 14/41] filemap: allocate huge page in page_cache_read(), if allowed
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This patch adds basic functionality to put huge page into page cache.
At the moment we only put huge pages into radix-tree if the range covered
by the huge page is empty.
We ignore shadow entires for now, just remove them from the tree before
inserting huge page.
Later we can add logic to accumulate information from shadow entires to
return to caller (average eviction time?).
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/fs.h | 5 ++
include/linux/pagemap.h | 21 ++++++-
mm/filemap.c | 148 +++++++++++++++++++++++++++++++++++++++++++-----
3 files changed, 157 insertions(+), 17 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 83253f34416d..a35a0ffbee66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1840,6 +1840,11 @@ struct super_operations {
#else
#define S_DAX 0 /* Make all the DAX code disappear */
#endif
+#define S_HUGE_MODE 0xc000
+#define S_HUGE_NEVER 0x0000
+#define S_HUGE_ALWAYS 0x4000
+#define S_HUGE_WITHIN_SIZE 0x8000
+#define S_HUGE_ADVISE 0xc000
/*
* Note that nosuid etc flags are inode-specific: setting some file-system
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 81363b834900..d9cf4e0f35dc 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -191,14 +191,20 @@ static inline int page_cache_add_speculative(struct page *page, int count)
}
#ifdef CONFIG_NUMA
-extern struct page *__page_cache_alloc(gfp_t gfp);
+extern struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order);
#else
-static inline struct page *__page_cache_alloc(gfp_t gfp)
+static inline struct page *__page_cache_alloc_order(gfp_t gfp,
+ unsigned int order)
{
- return alloc_pages(gfp, 0);
+ return alloc_pages(gfp, order);
}
#endif
+static inline struct page *__page_cache_alloc(gfp_t gfp)
+{
+ return __page_cache_alloc_order(gfp, 0);
+}
+
static inline struct page *page_cache_alloc(struct address_space *x)
{
return __page_cache_alloc(mapping_gfp_mask(x));
@@ -215,6 +221,15 @@ static inline gfp_t readahead_gfp_mask(struct address_space *x)
__GFP_COLD | __GFP_NORETRY | __GFP_NOWARN;
}
+extern bool __page_cache_allow_huge(struct address_space *x, pgoff_t offset);
+static inline bool page_cache_allow_huge(struct address_space *x,
+ pgoff_t offset)
+{
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
+ return false;
+ return __page_cache_allow_huge(x, offset);
+}
+
typedef int filler_t(void *, struct page *);
pgoff_t page_cache_next_hole(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index f2640fe345dd..ae1d996fa089 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -637,14 +637,14 @@ static int __add_to_page_cache_locked(struct page *page,
pgoff_t offset, gfp_t gfp_mask,
void **shadowp)
{
- int huge = PageHuge(page);
+ int hugetlb = PageHuge(page);
struct mem_cgroup *memcg;
int error;
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageSwapBacked(page), page);
- if (!huge) {
+ if (!hugetlb) {
error = mem_cgroup_try_charge(page, current->mm,
gfp_mask, &memcg, false);
if (error)
@@ -653,7 +653,7 @@ static int __add_to_page_cache_locked(struct page *page,
error = radix_tree_maybe_preload(gfp_mask & ~__GFP_HIGHMEM);
if (error) {
- if (!huge)
+ if (!hugetlb)
mem_cgroup_cancel_charge(page, memcg, false);
return error;
}
@@ -663,16 +663,55 @@ static int __add_to_page_cache_locked(struct page *page,
page->index = offset;
spin_lock_irq(&mapping->tree_lock);
- error = page_cache_tree_insert(mapping, page, shadowp);
+ if (PageTransHuge(page)) {
+ struct radix_tree_iter iter;
+ void **slot;
+ void *p;
+
+ error = 0;
+
+ /* Wipe shadow entires */
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+ if (iter.index >= offset + HPAGE_PMD_NR)
+ break;
+
+ p = radix_tree_deref_slot_protected(slot,
+ &mapping->tree_lock);
+ if (!p)
+ continue;
+
+ if (!radix_tree_exception(p)) {
+ error = -EEXIST;
+ break;
+ }
+
+ mapping->nrexceptional--;
+ rcu_assign_pointer(*slot, NULL);
+ }
+
+ if (!error)
+ error = __radix_tree_insert(&mapping->page_tree, offset,
+ compound_order(page), page);
+
+ if (!error) {
+ count_vm_event(THP_FILE_ALLOC);
+ mapping->nrpages += HPAGE_PMD_NR;
+ *shadowp = NULL;
+ __inc_node_page_state(page, NR_FILE_THPS);
+ }
+ } else {
+ error = page_cache_tree_insert(mapping, page, shadowp);
+ }
radix_tree_preload_end();
if (unlikely(error))
goto err_insert;
/* hugetlb pages do not participate in page cache accounting. */
- if (!huge)
- __inc_node_page_state(page, NR_FILE_PAGES);
+ if (!hugetlb)
+ __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES,
+ hpage_nr_pages(page));
spin_unlock_irq(&mapping->tree_lock);
- if (!huge)
+ if (!hugetlb)
mem_cgroup_commit_charge(page, memcg, false, false);
trace_mm_filemap_add_to_page_cache(page);
return 0;
@@ -680,7 +719,7 @@ err_insert:
page->mapping = NULL;
/* Leave page->index set: truncation relies upon it */
spin_unlock_irq(&mapping->tree_lock);
- if (!huge)
+ if (!hugetlb)
mem_cgroup_cancel_charge(page, memcg, false);
put_page(page);
return error;
@@ -737,7 +776,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
#ifdef CONFIG_NUMA
-struct page *__page_cache_alloc(gfp_t gfp)
+struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order)
{
int n;
struct page *page;
@@ -747,14 +786,14 @@ struct page *__page_cache_alloc(gfp_t gfp)
do {
cpuset_mems_cookie = read_mems_allowed_begin();
n = cpuset_mem_spread_node();
- page = __alloc_pages_node(n, gfp, 0);
+ page = __alloc_pages_node(n, gfp, order);
} while (!page && read_mems_allowed_retry(cpuset_mems_cookie));
return page;
}
- return alloc_pages(gfp, 0);
+ return alloc_pages(gfp, order);
}
-EXPORT_SYMBOL(__page_cache_alloc);
+EXPORT_SYMBOL(__page_cache_alloc_order);
#endif
/*
@@ -1149,6 +1188,69 @@ repeat:
}
EXPORT_SYMBOL(find_lock_entry);
+bool __page_cache_allow_huge(struct address_space *mapping, pgoff_t offset)
+{
+ struct inode *inode = mapping->host;
+ struct radix_tree_iter iter;
+ void **slot;
+ struct page *page;
+
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ return false;
+
+ offset = round_down(offset, HPAGE_PMD_NR);
+
+ switch (inode->i_flags & S_HUGE_MODE) {
+ case S_HUGE_NEVER:
+ return false;
+ case S_HUGE_ALWAYS:
+ break;
+ case S_HUGE_WITHIN_SIZE:
+ if (DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) <
+ offset + HPAGE_PMD_NR)
+ return false;
+ break;
+ case S_HUGE_ADVISE:
+ /* TODO */
+ return false;
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+ if (iter.index >= offset + HPAGE_PMD_NR)
+ break;
+
+ /* Shadow entires are fine */
+ page = radix_tree_deref_slot(slot);
+ if (page && !radix_tree_exception(page)) {
+ rcu_read_unlock();
+ return false;
+ }
+ }
+ rcu_read_unlock();
+
+ return true;
+
+}
+
+static struct page *page_cache_alloc_huge(struct address_space *mapping,
+ pgoff_t offset, gfp_t gfp_mask)
+{
+ struct page *page;
+
+ if (!page_cache_allow_huge(mapping, offset))
+ return NULL;
+
+ gfp_mask |= __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN;
+ page = __page_cache_alloc_order(gfp_mask, HPAGE_PMD_ORDER);
+ if (page)
+ prep_transhuge_page(page);
+ return page;
+}
+
/**
* pagecache_get_page - find and get a page reference
* @mapping: the address_space to search
@@ -2022,19 +2124,37 @@ static int page_cache_read(struct file *file, pgoff_t offset, gfp_t gfp_mask)
{
struct address_space *mapping = file->f_mapping;
struct page *page;
+ pgoff_t hoffset;
int ret;
do {
- page = __page_cache_alloc(gfp_mask|__GFP_COLD);
+ page = page_cache_alloc_huge(mapping, offset, gfp_mask);
+no_huge:
+ if (!page)
+ page = __page_cache_alloc(gfp_mask|__GFP_COLD);
if (!page)
return -ENOMEM;
- ret = add_to_page_cache_lru(page, mapping, offset, gfp_mask & GFP_KERNEL);
+ if (PageTransHuge(page))
+ hoffset = round_down(offset, HPAGE_PMD_NR);
+ else
+ hoffset = offset;
+
+ ret = add_to_page_cache_lru(page, mapping, hoffset,
+ gfp_mask & GFP_KERNEL);
if (ret == 0)
ret = mapping->a_ops->readpage(file, page);
else if (ret == -EEXIST)
ret = 0; /* losing race to add is OK */
+ if (ret && PageTransHuge(page)) {
+ delete_from_page_cache(page);
+ unlock_page(page);
+ put_page(page);
+ page = NULL;
+ goto no_huge;
+ }
+
put_page(page);
} while (ret == AOP_TRUNCATED_PAGE);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 14/41] filemap: allocate huge page in page_cache_read(), if allowed
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This patch adds basic functionality to put huge page into page cache.
At the moment we only put huge pages into radix-tree if the range covered
by the huge page is empty.
We ignore shadow entires for now, just remove them from the tree before
inserting huge page.
Later we can add logic to accumulate information from shadow entires to
return to caller (average eviction time?).
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/fs.h | 5 ++
include/linux/pagemap.h | 21 ++++++-
mm/filemap.c | 148 +++++++++++++++++++++++++++++++++++++++++++-----
3 files changed, 157 insertions(+), 17 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 83253f34416d..a35a0ffbee66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1840,6 +1840,11 @@ struct super_operations {
#else
#define S_DAX 0 /* Make all the DAX code disappear */
#endif
+#define S_HUGE_MODE 0xc000
+#define S_HUGE_NEVER 0x0000
+#define S_HUGE_ALWAYS 0x4000
+#define S_HUGE_WITHIN_SIZE 0x8000
+#define S_HUGE_ADVISE 0xc000
/*
* Note that nosuid etc flags are inode-specific: setting some file-system
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 81363b834900..d9cf4e0f35dc 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -191,14 +191,20 @@ static inline int page_cache_add_speculative(struct page *page, int count)
}
#ifdef CONFIG_NUMA
-extern struct page *__page_cache_alloc(gfp_t gfp);
+extern struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order);
#else
-static inline struct page *__page_cache_alloc(gfp_t gfp)
+static inline struct page *__page_cache_alloc_order(gfp_t gfp,
+ unsigned int order)
{
- return alloc_pages(gfp, 0);
+ return alloc_pages(gfp, order);
}
#endif
+static inline struct page *__page_cache_alloc(gfp_t gfp)
+{
+ return __page_cache_alloc_order(gfp, 0);
+}
+
static inline struct page *page_cache_alloc(struct address_space *x)
{
return __page_cache_alloc(mapping_gfp_mask(x));
@@ -215,6 +221,15 @@ static inline gfp_t readahead_gfp_mask(struct address_space *x)
__GFP_COLD | __GFP_NORETRY | __GFP_NOWARN;
}
+extern bool __page_cache_allow_huge(struct address_space *x, pgoff_t offset);
+static inline bool page_cache_allow_huge(struct address_space *x,
+ pgoff_t offset)
+{
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
+ return false;
+ return __page_cache_allow_huge(x, offset);
+}
+
typedef int filler_t(void *, struct page *);
pgoff_t page_cache_next_hole(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index f2640fe345dd..ae1d996fa089 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -637,14 +637,14 @@ static int __add_to_page_cache_locked(struct page *page,
pgoff_t offset, gfp_t gfp_mask,
void **shadowp)
{
- int huge = PageHuge(page);
+ int hugetlb = PageHuge(page);
struct mem_cgroup *memcg;
int error;
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageSwapBacked(page), page);
- if (!huge) {
+ if (!hugetlb) {
error = mem_cgroup_try_charge(page, current->mm,
gfp_mask, &memcg, false);
if (error)
@@ -653,7 +653,7 @@ static int __add_to_page_cache_locked(struct page *page,
error = radix_tree_maybe_preload(gfp_mask & ~__GFP_HIGHMEM);
if (error) {
- if (!huge)
+ if (!hugetlb)
mem_cgroup_cancel_charge(page, memcg, false);
return error;
}
@@ -663,16 +663,55 @@ static int __add_to_page_cache_locked(struct page *page,
page->index = offset;
spin_lock_irq(&mapping->tree_lock);
- error = page_cache_tree_insert(mapping, page, shadowp);
+ if (PageTransHuge(page)) {
+ struct radix_tree_iter iter;
+ void **slot;
+ void *p;
+
+ error = 0;
+
+ /* Wipe shadow entires */
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+ if (iter.index >= offset + HPAGE_PMD_NR)
+ break;
+
+ p = radix_tree_deref_slot_protected(slot,
+ &mapping->tree_lock);
+ if (!p)
+ continue;
+
+ if (!radix_tree_exception(p)) {
+ error = -EEXIST;
+ break;
+ }
+
+ mapping->nrexceptional--;
+ rcu_assign_pointer(*slot, NULL);
+ }
+
+ if (!error)
+ error = __radix_tree_insert(&mapping->page_tree, offset,
+ compound_order(page), page);
+
+ if (!error) {
+ count_vm_event(THP_FILE_ALLOC);
+ mapping->nrpages += HPAGE_PMD_NR;
+ *shadowp = NULL;
+ __inc_node_page_state(page, NR_FILE_THPS);
+ }
+ } else {
+ error = page_cache_tree_insert(mapping, page, shadowp);
+ }
radix_tree_preload_end();
if (unlikely(error))
goto err_insert;
/* hugetlb pages do not participate in page cache accounting. */
- if (!huge)
- __inc_node_page_state(page, NR_FILE_PAGES);
+ if (!hugetlb)
+ __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES,
+ hpage_nr_pages(page));
spin_unlock_irq(&mapping->tree_lock);
- if (!huge)
+ if (!hugetlb)
mem_cgroup_commit_charge(page, memcg, false, false);
trace_mm_filemap_add_to_page_cache(page);
return 0;
@@ -680,7 +719,7 @@ err_insert:
page->mapping = NULL;
/* Leave page->index set: truncation relies upon it */
spin_unlock_irq(&mapping->tree_lock);
- if (!huge)
+ if (!hugetlb)
mem_cgroup_cancel_charge(page, memcg, false);
put_page(page);
return error;
@@ -737,7 +776,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
#ifdef CONFIG_NUMA
-struct page *__page_cache_alloc(gfp_t gfp)
+struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order)
{
int n;
struct page *page;
@@ -747,14 +786,14 @@ struct page *__page_cache_alloc(gfp_t gfp)
do {
cpuset_mems_cookie = read_mems_allowed_begin();
n = cpuset_mem_spread_node();
- page = __alloc_pages_node(n, gfp, 0);
+ page = __alloc_pages_node(n, gfp, order);
} while (!page && read_mems_allowed_retry(cpuset_mems_cookie));
return page;
}
- return alloc_pages(gfp, 0);
+ return alloc_pages(gfp, order);
}
-EXPORT_SYMBOL(__page_cache_alloc);
+EXPORT_SYMBOL(__page_cache_alloc_order);
#endif
/*
@@ -1149,6 +1188,69 @@ repeat:
}
EXPORT_SYMBOL(find_lock_entry);
+bool __page_cache_allow_huge(struct address_space *mapping, pgoff_t offset)
+{
+ struct inode *inode = mapping->host;
+ struct radix_tree_iter iter;
+ void **slot;
+ struct page *page;
+
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ return false;
+
+ offset = round_down(offset, HPAGE_PMD_NR);
+
+ switch (inode->i_flags & S_HUGE_MODE) {
+ case S_HUGE_NEVER:
+ return false;
+ case S_HUGE_ALWAYS:
+ break;
+ case S_HUGE_WITHIN_SIZE:
+ if (DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) <
+ offset + HPAGE_PMD_NR)
+ return false;
+ break;
+ case S_HUGE_ADVISE:
+ /* TODO */
+ return false;
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+ if (iter.index >= offset + HPAGE_PMD_NR)
+ break;
+
+ /* Shadow entires are fine */
+ page = radix_tree_deref_slot(slot);
+ if (page && !radix_tree_exception(page)) {
+ rcu_read_unlock();
+ return false;
+ }
+ }
+ rcu_read_unlock();
+
+ return true;
+
+}
+
+static struct page *page_cache_alloc_huge(struct address_space *mapping,
+ pgoff_t offset, gfp_t gfp_mask)
+{
+ struct page *page;
+
+ if (!page_cache_allow_huge(mapping, offset))
+ return NULL;
+
+ gfp_mask |= __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN;
+ page = __page_cache_alloc_order(gfp_mask, HPAGE_PMD_ORDER);
+ if (page)
+ prep_transhuge_page(page);
+ return page;
+}
+
/**
* pagecache_get_page - find and get a page reference
* @mapping: the address_space to search
@@ -2022,19 +2124,37 @@ static int page_cache_read(struct file *file, pgoff_t offset, gfp_t gfp_mask)
{
struct address_space *mapping = file->f_mapping;
struct page *page;
+ pgoff_t hoffset;
int ret;
do {
- page = __page_cache_alloc(gfp_mask|__GFP_COLD);
+ page = page_cache_alloc_huge(mapping, offset, gfp_mask);
+no_huge:
+ if (!page)
+ page = __page_cache_alloc(gfp_mask|__GFP_COLD);
if (!page)
return -ENOMEM;
- ret = add_to_page_cache_lru(page, mapping, offset, gfp_mask & GFP_KERNEL);
+ if (PageTransHuge(page))
+ hoffset = round_down(offset, HPAGE_PMD_NR);
+ else
+ hoffset = offset;
+
+ ret = add_to_page_cache_lru(page, mapping, hoffset,
+ gfp_mask & GFP_KERNEL);
if (ret == 0)
ret = mapping->a_ops->readpage(file, page);
else if (ret == -EEXIST)
ret = 0; /* losing race to add is OK */
+ if (ret && PageTransHuge(page)) {
+ delete_from_page_cache(page);
+ unlock_page(page);
+ put_page(page);
+ page = NULL;
+ goto no_huge;
+ }
+
put_page(page);
} while (ret == AOP_TRUNCATED_PAGE);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 15/41] filemap: handle huge pages in do_generic_file_read()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Most of work happans on head page. Only when we need to do copy data to
userspace we find relevant subpage.
We are still limited by PAGE_SIZE per iteration. Lifting this limitation
would require some more work.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index ae1d996fa089..9d7d70b265d4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1860,6 +1860,7 @@ find_page:
if (unlikely(page == NULL))
goto no_cached_page;
}
+ page = compound_head(page);
if (PageReadahead(page)) {
page_cache_async_readahead(mapping,
ra, filp, page,
@@ -1936,7 +1937,8 @@ page_ok:
* now we can copy it to user space...
*/
- ret = copy_page_to_iter(page, offset, nr, iter);
+ ret = copy_page_to_iter(page + index - page->index, offset,
+ nr, iter);
offset += ret;
index += offset >> PAGE_SHIFT;
offset &= ~PAGE_MASK;
@@ -2356,6 +2358,7 @@ page_not_uptodate:
* because there really aren't any performance issues here
* and we need to check for errors.
*/
+ page = compound_head(page);
ClearPageError(page);
error = mapping->a_ops->readpage(file, page);
if (!error) {
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 15/41] filemap: handle huge pages in do_generic_file_read()
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Most of work happans on head page. Only when we need to do copy data to
userspace we find relevant subpage.
We are still limited by PAGE_SIZE per iteration. Lifting this limitation
would require some more work.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index ae1d996fa089..9d7d70b265d4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1860,6 +1860,7 @@ find_page:
if (unlikely(page == NULL))
goto no_cached_page;
}
+ page = compound_head(page);
if (PageReadahead(page)) {
page_cache_async_readahead(mapping,
ra, filp, page,
@@ -1936,7 +1937,8 @@ page_ok:
* now we can copy it to user space...
*/
- ret = copy_page_to_iter(page, offset, nr, iter);
+ ret = copy_page_to_iter(page + index - page->index, offset,
+ nr, iter);
offset += ret;
index += offset >> PAGE_SHIFT;
offset &= ~PAGE_MASK;
@@ -2356,6 +2358,7 @@ page_not_uptodate:
* because there really aren't any performance issues here
* and we need to check for errors.
*/
+ page = compound_head(page);
ClearPageError(page);
error = mapping->a_ops->readpage(file, page);
if (!error) {
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 16/41] filemap: allocate huge page in pagecache_get_page(), if allowed
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:37 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Write path allocate pages using pagecache_get_page(). We should be able
to allocate huge pages there, if it's allowed. As usually, fallback to
small pages, if failed.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 9d7d70b265d4..93fa97f143ab 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1310,13 +1310,16 @@ repeat:
no_page:
if (!page && (fgp_flags & FGP_CREAT)) {
+ pgoff_t hoffset;
int err;
if ((fgp_flags & FGP_WRITE) && mapping_cap_account_dirty(mapping))
gfp_mask |= __GFP_WRITE;
if (fgp_flags & FGP_NOFS)
gfp_mask &= ~__GFP_FS;
- page = __page_cache_alloc(gfp_mask);
+ page = page_cache_alloc_huge(mapping, offset, gfp_mask);
+no_huge: if (!page)
+ page = __page_cache_alloc(gfp_mask);
if (!page)
return NULL;
@@ -1327,14 +1330,25 @@ no_page:
if (fgp_flags & FGP_ACCESSED)
__SetPageReferenced(page);
- err = add_to_page_cache_lru(page, mapping, offset,
+ if (PageTransHuge(page))
+ hoffset = round_down(offset, HPAGE_PMD_NR);
+ else
+ hoffset = offset;
+
+ err = add_to_page_cache_lru(page, mapping, hoffset,
gfp_mask & GFP_RECLAIM_MASK);
if (unlikely(err)) {
+ if (PageTransHuge(page)) {
+ put_page(page);
+ page = NULL;
+ goto no_huge;
+ }
put_page(page);
page = NULL;
if (err == -EEXIST)
goto repeat;
}
+ page += offset - hoffset;
}
return page;
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 16/41] filemap: allocate huge page in pagecache_get_page(), if allowed
@ 2016-08-12 18:37 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:37 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Write path allocate pages using pagecache_get_page(). We should be able
to allocate huge pages there, if it's allowed. As usually, fallback to
small pages, if failed.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 9d7d70b265d4..93fa97f143ab 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1310,13 +1310,16 @@ repeat:
no_page:
if (!page && (fgp_flags & FGP_CREAT)) {
+ pgoff_t hoffset;
int err;
if ((fgp_flags & FGP_WRITE) && mapping_cap_account_dirty(mapping))
gfp_mask |= __GFP_WRITE;
if (fgp_flags & FGP_NOFS)
gfp_mask &= ~__GFP_FS;
- page = __page_cache_alloc(gfp_mask);
+ page = page_cache_alloc_huge(mapping, offset, gfp_mask);
+no_huge: if (!page)
+ page = __page_cache_alloc(gfp_mask);
if (!page)
return NULL;
@@ -1327,14 +1330,25 @@ no_page:
if (fgp_flags & FGP_ACCESSED)
__SetPageReferenced(page);
- err = add_to_page_cache_lru(page, mapping, offset,
+ if (PageTransHuge(page))
+ hoffset = round_down(offset, HPAGE_PMD_NR);
+ else
+ hoffset = offset;
+
+ err = add_to_page_cache_lru(page, mapping, hoffset,
gfp_mask & GFP_RECLAIM_MASK);
if (unlikely(err)) {
+ if (PageTransHuge(page)) {
+ put_page(page);
+ page = NULL;
+ goto no_huge;
+ }
put_page(page);
page = NULL;
if (err == -EEXIST)
goto repeat;
}
+ page += offset - hoffset;
}
return page;
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 17/41] filemap: handle huge pages in filemap_fdatawait_range()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We writeback whole huge page a time.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c
index 93fa97f143ab..429f9a0962b3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -372,9 +372,14 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
if (page->index > end)
continue;
+ page = compound_head(page);
wait_on_page_writeback(page);
if (TestClearPageError(page))
ret = -EIO;
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR;
+ i += index - pvec.pages[i]->index - 1;
+ }
}
pagevec_release(&pvec);
cond_resched();
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 17/41] filemap: handle huge pages in filemap_fdatawait_range()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We writeback whole huge page a time.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/filemap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c
index 93fa97f143ab..429f9a0962b3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -372,9 +372,14 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
if (page->index > end)
continue;
+ page = compound_head(page);
wait_on_page_writeback(page);
if (TestClearPageError(page))
ret = -EIO;
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR;
+ i += index - pvec.pages[i]->index - 1;
+ }
}
pagevec_release(&pvec);
cond_resched();
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 18/41] HACK: readahead: alloc huge pages, if allowed
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Most page cache allocation happens via readahead (sync or async), so if
we want to have significant number of huge pages in page cache we need
to find a ways to allocate them from readahead.
Unfortunately, huge pages doesn't fit into current readahead design:
128 max readahead window, assumption on page size, PageReadahead() to
track hit/miss.
I haven't found a ways to get it right yet.
This patch just allocates huge page if allowed, but doesn't really
provide any readahead if huge page is allocated. We read out 2M a time
and I would expect spikes in latancy without readahead.
Therefore HACK.
Having that said, I don't think it should prevent huge page support to
be applied. Future will show if lacking readahead is a big deal with
huge pages in page cache.
Any suggestions are welcome.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/readahead.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 65ec288dc057..3cea3e8f1d3f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -173,6 +173,21 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
if (page_offset > end_index)
break;
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) &&
+ (!page_idx || !(page_offset % HPAGE_PMD_NR)) &&
+ page_cache_allow_huge(mapping, page_offset)) {
+ page = __page_cache_alloc_order(gfp_mask | __GFP_COMP,
+ HPAGE_PMD_ORDER);
+ if (page) {
+ prep_transhuge_page(page);
+ page->index = round_down(page_offset,
+ HPAGE_PMD_NR);
+ list_add(&page->lru, &page_pool);
+ ret++;
+ goto start_io;
+ }
+ }
+
rcu_read_lock();
page = radix_tree_lookup(&mapping->page_tree, page_offset);
rcu_read_unlock();
@@ -188,7 +203,7 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
SetPageReadahead(page);
ret++;
}
-
+start_io:
/*
* Now start the IO. We ignore I/O errors - if the page is not
* uptodate then the caller will launch readpage again, and
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 18/41] HACK: readahead: alloc huge pages, if allowed
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Most page cache allocation happens via readahead (sync or async), so if
we want to have significant number of huge pages in page cache we need
to find a ways to allocate them from readahead.
Unfortunately, huge pages doesn't fit into current readahead design:
128 max readahead window, assumption on page size, PageReadahead() to
track hit/miss.
I haven't found a ways to get it right yet.
This patch just allocates huge page if allowed, but doesn't really
provide any readahead if huge page is allocated. We read out 2M a time
and I would expect spikes in latancy without readahead.
Therefore HACK.
Having that said, I don't think it should prevent huge page support to
be applied. Future will show if lacking readahead is a big deal with
huge pages in page cache.
Any suggestions are welcome.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/readahead.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 65ec288dc057..3cea3e8f1d3f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -173,6 +173,21 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
if (page_offset > end_index)
break;
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) &&
+ (!page_idx || !(page_offset % HPAGE_PMD_NR)) &&
+ page_cache_allow_huge(mapping, page_offset)) {
+ page = __page_cache_alloc_order(gfp_mask | __GFP_COMP,
+ HPAGE_PMD_ORDER);
+ if (page) {
+ prep_transhuge_page(page);
+ page->index = round_down(page_offset,
+ HPAGE_PMD_NR);
+ list_add(&page->lru, &page_pool);
+ ret++;
+ goto start_io;
+ }
+ }
+
rcu_read_lock();
page = radix_tree_lookup(&mapping->page_tree, page_offset);
rcu_read_unlock();
@@ -188,7 +203,7 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
SetPageReadahead(page);
ret++;
}
-
+start_io:
/*
* Now start the IO. We ignore I/O errors - if the page is not
* uptodate then the caller will launch readpage again, and
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 19/41] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We are going to do IO a huge page a time. So we need BIO_MAX_PAGES to be
at least HPAGE_PMD_NR. For x86-64, it's 512 pages.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/bio.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 583c10810e32..c7104a77e0db 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -40,7 +40,11 @@
#define BIO_BUG_ON
#endif
+#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
+#define BIO_MAX_PAGES (HPAGE_PMD_NR > 256 ? HPAGE_PMD_NR : 256)
+#else
#define BIO_MAX_PAGES 256
+#endif
#define bio_prio(bio) (bio)->bi_ioprio
#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 19/41] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We are going to do IO a huge page a time. So we need BIO_MAX_PAGES to be
at least HPAGE_PMD_NR. For x86-64, it's 512 pages.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/bio.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 583c10810e32..c7104a77e0db 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -40,7 +40,11 @@
#define BIO_BUG_ON
#endif
+#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
+#define BIO_MAX_PAGES (HPAGE_PMD_NR > 256 ? HPAGE_PMD_NR : 256)
+#else
#define BIO_MAX_PAGES 256
+#endif
#define bio_prio(bio) (bio)->bi_ioprio
#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 20/41] mm: make write_cache_pages() work on huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We writeback whole huge page a time. Let's adjust iteration this way.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/mm.h | 1 +
include/linux/pagemap.h | 1 +
mm/page-writeback.c | 17 ++++++++++++-----
3 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 08ed53eeedd5..b68d77912313 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1054,6 +1054,7 @@ struct address_space *page_file_mapping(struct page *page)
*/
static inline pgoff_t page_index(struct page *page)
{
+ page = compound_head(page);
if (unlikely(PageSwapCache(page)))
return page_private(page);
return page->index;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index d9cf4e0f35dc..24e14ef1cfe5 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -518,6 +518,7 @@ static inline void wait_on_page_locked(struct page *page)
*/
static inline void wait_on_page_writeback(struct page *page)
{
+ page = compound_head(page);
if (PageWriteback(page))
wait_on_page_bit(page, PG_writeback);
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index f4cd7d8005c9..6390c9488e29 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2242,7 +2242,7 @@ retry:
* mapping. However, page->index will not change
* because we have a reference on the page.
*/
- if (page->index > end) {
+ if (page_to_pgoff(page) > end) {
/*
* can't be range_cyclic (1st pass) because
* end == -1 in that case.
@@ -2251,7 +2251,12 @@ retry:
break;
}
- done_index = page->index;
+ done_index = page_to_pgoff(page);
+ if (PageTransCompound(page)) {
+ index = round_up(index + 1, HPAGE_PMD_NR);
+ i += HPAGE_PMD_NR -
+ done_index % HPAGE_PMD_NR - 1;
+ }
lock_page(page);
@@ -2263,7 +2268,7 @@ retry:
* even if there is now a new, dirty page at the same
* pagecache address.
*/
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
continue_unlock:
unlock_page(page);
continue;
@@ -2301,7 +2306,8 @@ continue_unlock:
* not be suitable for data integrity
* writeout).
*/
- done_index = page->index + 1;
+ done_index = compound_head(page)->index
+ + hpage_nr_pages(page);
done = 1;
break;
}
@@ -2313,7 +2319,8 @@ continue_unlock:
* keep going until we have written all the pages
* we tagged for writeback prior to entering this loop.
*/
- if (--wbc->nr_to_write <= 0 &&
+ wbc->nr_to_write -= hpage_nr_pages(page);
+ if (wbc->nr_to_write <= 0 &&
wbc->sync_mode == WB_SYNC_NONE) {
done = 1;
break;
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 20/41] mm: make write_cache_pages() work on huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
We writeback whole huge page a time. Let's adjust iteration this way.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/mm.h | 1 +
include/linux/pagemap.h | 1 +
mm/page-writeback.c | 17 ++++++++++++-----
3 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 08ed53eeedd5..b68d77912313 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1054,6 +1054,7 @@ struct address_space *page_file_mapping(struct page *page)
*/
static inline pgoff_t page_index(struct page *page)
{
+ page = compound_head(page);
if (unlikely(PageSwapCache(page)))
return page_private(page);
return page->index;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index d9cf4e0f35dc..24e14ef1cfe5 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -518,6 +518,7 @@ static inline void wait_on_page_locked(struct page *page)
*/
static inline void wait_on_page_writeback(struct page *page)
{
+ page = compound_head(page);
if (PageWriteback(page))
wait_on_page_bit(page, PG_writeback);
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index f4cd7d8005c9..6390c9488e29 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2242,7 +2242,7 @@ retry:
* mapping. However, page->index will not change
* because we have a reference on the page.
*/
- if (page->index > end) {
+ if (page_to_pgoff(page) > end) {
/*
* can't be range_cyclic (1st pass) because
* end == -1 in that case.
@@ -2251,7 +2251,12 @@ retry:
break;
}
- done_index = page->index;
+ done_index = page_to_pgoff(page);
+ if (PageTransCompound(page)) {
+ index = round_up(index + 1, HPAGE_PMD_NR);
+ i += HPAGE_PMD_NR -
+ done_index % HPAGE_PMD_NR - 1;
+ }
lock_page(page);
@@ -2263,7 +2268,7 @@ retry:
* even if there is now a new, dirty page at the same
* pagecache address.
*/
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
continue_unlock:
unlock_page(page);
continue;
@@ -2301,7 +2306,8 @@ continue_unlock:
* not be suitable for data integrity
* writeout).
*/
- done_index = page->index + 1;
+ done_index = compound_head(page)->index
+ + hpage_nr_pages(page);
done = 1;
break;
}
@@ -2313,7 +2319,8 @@ continue_unlock:
* keep going until we have written all the pages
* we tagged for writeback prior to entering this loop.
*/
- if (--wbc->nr_to_write <= 0 &&
+ wbc->nr_to_write -= hpage_nr_pages(page);
+ if (wbc->nr_to_write <= 0 &&
wbc->sync_mode == WB_SYNC_NONE) {
done = 1;
break;
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 21/41] thp: introduce hpage_size() and hpage_mask()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Introduce new helpers which return size/mask of the page:
HPAGE_PMD_SIZE/HPAGE_PMD_MASK if the page is PageTransHuge() and
PAGE_SIZE/PAGE_MASK otherwise.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/huge_mm.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 6f14de45b5ce..de2789b4402c 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -138,6 +138,20 @@ static inline int hpage_nr_pages(struct page *page)
return 1;
}
+static inline int hpage_size(struct page *page)
+{
+ if (unlikely(PageTransHuge(page)))
+ return HPAGE_PMD_SIZE;
+ return PAGE_SIZE;
+}
+
+static inline unsigned long hpage_mask(struct page *page)
+{
+ if (unlikely(PageTransHuge(page)))
+ return HPAGE_PMD_MASK;
+ return PAGE_MASK;
+}
+
extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
extern struct page *huge_zero_page;
@@ -163,6 +177,8 @@ void put_huge_zero_page(void);
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
#define hpage_nr_pages(x) 1
+#define hpage_size(x) PAGE_SIZE
+#define hpage_mask(x) PAGE_MASK
#define transparent_hugepage_enabled(__vma) 0
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 21/41] thp: introduce hpage_size() and hpage_mask()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Introduce new helpers which return size/mask of the page:
HPAGE_PMD_SIZE/HPAGE_PMD_MASK if the page is PageTransHuge() and
PAGE_SIZE/PAGE_MASK otherwise.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/huge_mm.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 6f14de45b5ce..de2789b4402c 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -138,6 +138,20 @@ static inline int hpage_nr_pages(struct page *page)
return 1;
}
+static inline int hpage_size(struct page *page)
+{
+ if (unlikely(PageTransHuge(page)))
+ return HPAGE_PMD_SIZE;
+ return PAGE_SIZE;
+}
+
+static inline unsigned long hpage_mask(struct page *page)
+{
+ if (unlikely(PageTransHuge(page)))
+ return HPAGE_PMD_MASK;
+ return PAGE_MASK;
+}
+
extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
extern struct page *huge_zero_page;
@@ -163,6 +177,8 @@ void put_huge_zero_page(void);
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
#define hpage_nr_pages(x) 1
+#define hpage_size(x) PAGE_SIZE
+#define hpage_mask(x) PAGE_MASK
#define transparent_hugepage_enabled(__vma) 0
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 22/41] thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask}
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Slab pages can be compound, but we shouldn't threat them as THP for
pupose of hpage_* helpers, otherwise it would lead to confusing results.
For instance, ext4 uses slab pages for journal pages and we shouldn't
confuse them with THPs. The easiest way is to exclude them in hpage_*
helpers.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/huge_mm.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index de2789b4402c..5c5466ba37df 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -133,21 +133,21 @@ static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
}
static inline int hpage_nr_pages(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_NR;
return 1;
}
static inline int hpage_size(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_SIZE;
return PAGE_SIZE;
}
static inline unsigned long hpage_mask(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_MASK;
return PAGE_MASK;
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 22/41] thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask}
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Slab pages can be compound, but we shouldn't threat them as THP for
pupose of hpage_* helpers, otherwise it would lead to confusing results.
For instance, ext4 uses slab pages for journal pages and we shouldn't
confuse them with THPs. The easiest way is to exclude them in hpage_*
helpers.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/huge_mm.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index de2789b4402c..5c5466ba37df 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -133,21 +133,21 @@ static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
}
static inline int hpage_nr_pages(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_NR;
return 1;
}
static inline int hpage_size(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_SIZE;
return PAGE_SIZE;
}
static inline unsigned long hpage_mask(struct page *page)
{
- if (unlikely(PageTransHuge(page)))
+ if (unlikely(!PageSlab(page) && PageTransHuge(page)))
return HPAGE_PMD_MASK;
return PAGE_MASK;
}
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 23/41] fs: make block_read_full_page() be able to read huge page
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
The approach is straight-forward: for compound pages we read out whole
huge page.
For huge page we cannot have array of buffer head pointers on stack --
it's 4096 pointers on x86-64 -- 'arr' is allocated with kmalloc() for
huge pages.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 22 +++++++++++++++++-----
include/linux/buffer_head.h | 9 +++++----
include/linux/page-flags.h | 2 +-
3 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 9c8eb9b6db6a..2739f5dae690 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -870,7 +870,7 @@ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
try_again:
head = NULL;
- offset = PAGE_SIZE;
+ offset = hpage_size(page);
while ((offset -= size) >= 0) {
bh = alloc_buffer_head(GFP_NOFS);
if (!bh)
@@ -1466,7 +1466,7 @@ void set_bh_page(struct buffer_head *bh,
struct page *page, unsigned long offset)
{
bh->b_page = page;
- BUG_ON(offset >= PAGE_SIZE);
+ BUG_ON(offset >= hpage_size(page));
if (PageHighMem(page))
/*
* This catches illegal uses and preserves the offset:
@@ -2239,11 +2239,13 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
{
struct inode *inode = page->mapping->host;
sector_t iblock, lblock;
- struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
+ struct buffer_head *arr_on_stack[MAX_BUF_PER_PAGE];
+ struct buffer_head *bh, *head, **arr = arr_on_stack;
unsigned int blocksize, bbits;
int nr, i;
int fully_mapped = 1;
+ VM_BUG_ON_PAGE(PageTail(page), page);
head = create_page_buffers(page, inode, 0);
blocksize = head->b_size;
bbits = block_size_bits(blocksize);
@@ -2254,6 +2256,11 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
nr = 0;
i = 0;
+ if (PageTransHuge(page)) {
+ arr = kmalloc(sizeof(struct buffer_head *) * HPAGE_PMD_NR *
+ MAX_BUF_PER_PAGE, GFP_NOFS);
+ }
+
do {
if (buffer_uptodate(bh))
continue;
@@ -2269,7 +2276,9 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
SetPageError(page);
}
if (!buffer_mapped(bh)) {
- zero_user(page, i * blocksize, blocksize);
+ zero_user(page + (i * blocksize / PAGE_SIZE),
+ i * blocksize % PAGE_SIZE,
+ blocksize);
if (!err)
set_buffer_uptodate(bh);
continue;
@@ -2295,7 +2304,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
if (!PageError(page))
SetPageUptodate(page);
unlock_page(page);
- return 0;
+ goto out;
}
/* Stage two: lock the buffers */
@@ -2317,6 +2326,9 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
else
submit_bh(REQ_OP_READ, 0, bh);
}
+out:
+ if (arr != arr_on_stack)
+ kfree(arr);
return 0;
}
EXPORT_SYMBOL(block_read_full_page);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 006a8a42acfb..194a85822d5f 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -131,13 +131,14 @@ BUFFER_FNS(Meta, meta)
BUFFER_FNS(Prio, prio)
BUFFER_FNS(Defer_Completion, defer_completion)
-#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
+#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~hpage_mask(bh->b_page))
/* If we *know* page->private refers to buffer_heads */
-#define page_buffers(page) \
+#define page_buffers(__page) \
({ \
- BUG_ON(!PagePrivate(page)); \
- ((struct buffer_head *)page_private(page)); \
+ struct page *p = compound_head(__page); \
+ BUG_ON(!PagePrivate(p)); \
+ ((struct buffer_head *)page_private(p)); \
})
#define page_has_buffers(page) PagePrivate(page)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index a2bef9a41bcf..20b7684e9298 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -730,7 +730,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
*/
static inline int page_has_private(struct page *page)
{
- return !!(page->flags & PAGE_FLAGS_PRIVATE);
+ return !!(compound_head(page)->flags & PAGE_FLAGS_PRIVATE);
}
#undef PF_ANY
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 23/41] fs: make block_read_full_page() be able to read huge page
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
The approach is straight-forward: for compound pages we read out whole
huge page.
For huge page we cannot have array of buffer head pointers on stack --
it's 4096 pointers on x86-64 -- 'arr' is allocated with kmalloc() for
huge pages.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 22 +++++++++++++++++-----
include/linux/buffer_head.h | 9 +++++----
include/linux/page-flags.h | 2 +-
3 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 9c8eb9b6db6a..2739f5dae690 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -870,7 +870,7 @@ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
try_again:
head = NULL;
- offset = PAGE_SIZE;
+ offset = hpage_size(page);
while ((offset -= size) >= 0) {
bh = alloc_buffer_head(GFP_NOFS);
if (!bh)
@@ -1466,7 +1466,7 @@ void set_bh_page(struct buffer_head *bh,
struct page *page, unsigned long offset)
{
bh->b_page = page;
- BUG_ON(offset >= PAGE_SIZE);
+ BUG_ON(offset >= hpage_size(page));
if (PageHighMem(page))
/*
* This catches illegal uses and preserves the offset:
@@ -2239,11 +2239,13 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
{
struct inode *inode = page->mapping->host;
sector_t iblock, lblock;
- struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
+ struct buffer_head *arr_on_stack[MAX_BUF_PER_PAGE];
+ struct buffer_head *bh, *head, **arr = arr_on_stack;
unsigned int blocksize, bbits;
int nr, i;
int fully_mapped = 1;
+ VM_BUG_ON_PAGE(PageTail(page), page);
head = create_page_buffers(page, inode, 0);
blocksize = head->b_size;
bbits = block_size_bits(blocksize);
@@ -2254,6 +2256,11 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
nr = 0;
i = 0;
+ if (PageTransHuge(page)) {
+ arr = kmalloc(sizeof(struct buffer_head *) * HPAGE_PMD_NR *
+ MAX_BUF_PER_PAGE, GFP_NOFS);
+ }
+
do {
if (buffer_uptodate(bh))
continue;
@@ -2269,7 +2276,9 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
SetPageError(page);
}
if (!buffer_mapped(bh)) {
- zero_user(page, i * blocksize, blocksize);
+ zero_user(page + (i * blocksize / PAGE_SIZE),
+ i * blocksize % PAGE_SIZE,
+ blocksize);
if (!err)
set_buffer_uptodate(bh);
continue;
@@ -2295,7 +2304,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
if (!PageError(page))
SetPageUptodate(page);
unlock_page(page);
- return 0;
+ goto out;
}
/* Stage two: lock the buffers */
@@ -2317,6 +2326,9 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
else
submit_bh(REQ_OP_READ, 0, bh);
}
+out:
+ if (arr != arr_on_stack)
+ kfree(arr);
return 0;
}
EXPORT_SYMBOL(block_read_full_page);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 006a8a42acfb..194a85822d5f 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -131,13 +131,14 @@ BUFFER_FNS(Meta, meta)
BUFFER_FNS(Prio, prio)
BUFFER_FNS(Defer_Completion, defer_completion)
-#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
+#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~hpage_mask(bh->b_page))
/* If we *know* page->private refers to buffer_heads */
-#define page_buffers(page) \
+#define page_buffers(__page) \
({ \
- BUG_ON(!PagePrivate(page)); \
- ((struct buffer_head *)page_private(page)); \
+ struct page *p = compound_head(__page); \
+ BUG_ON(!PagePrivate(p)); \
+ ((struct buffer_head *)page_private(p)); \
})
#define page_has_buffers(page) PagePrivate(page)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index a2bef9a41bcf..20b7684e9298 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -730,7 +730,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
*/
static inline int page_has_private(struct page *page)
{
- return !!(page->flags & PAGE_FLAGS_PRIVATE);
+ return !!(compound_head(page)->flags & PAGE_FLAGS_PRIVATE);
}
#undef PF_ANY
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 24/41] fs: make block_write_{begin,end}() be able to handle huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
It's more or less straight-forward.
Most changes are around getting offset/len withing page right and zero
out desired part of the page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 53 +++++++++++++++++++++++++++++++----------------------
1 file changed, 31 insertions(+), 22 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 2739f5dae690..7f50e5a63670 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1870,21 +1870,21 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
do {
block_end = block_start + bh->b_size;
- if (buffer_new(bh)) {
- if (block_end > from && block_start < to) {
- if (!PageUptodate(page)) {
- unsigned start, size;
+ if (buffer_new(bh) && block_end > from && block_start < to) {
+ if (!PageUptodate(page)) {
+ unsigned start, size;
- start = max(from, block_start);
- size = min(to, block_end) - start;
+ start = max(from, block_start);
+ size = min(to, block_end) - start;
- zero_user(page, start, size);
- set_buffer_uptodate(bh);
- }
-
- clear_buffer_new(bh);
- mark_buffer_dirty(bh);
+ zero_user(page + block_start / PAGE_SIZE,
+ start % PAGE_SIZE,
+ size);
+ set_buffer_uptodate(bh);
}
+
+ clear_buffer_new(bh);
+ mark_buffer_dirty(bh);
}
block_start = block_end;
@@ -1950,18 +1950,20 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block, struct iomap *iomap)
{
- unsigned from = pos & (PAGE_SIZE - 1);
- unsigned to = from + len;
- struct inode *inode = page->mapping->host;
+ unsigned from, to;
+ struct inode *inode = page_mapping(page)->host;
unsigned block_start, block_end;
sector_t block;
int err = 0;
unsigned blocksize, bbits;
struct buffer_head *bh, *head, *wait[2], **wait_bh=wait;
+ page = compound_head(page);
+ from = pos & ~hpage_mask(page);
+ to = from + len;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_SIZE);
- BUG_ON(to > PAGE_SIZE);
+ BUG_ON(from > hpage_size(page));
+ BUG_ON(to > hpage_size(page));
BUG_ON(from > to);
head = create_page_buffers(page, inode, 0);
@@ -2001,10 +2003,15 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from)
- zero_user_segments(page,
- to, block_end,
- block_start, from);
+ if (block_end > to || block_start < from) {
+ BUG_ON(to - from > PAGE_SIZE);
+ zero_user_segments(page +
+ block_start / PAGE_SIZE,
+ to % PAGE_SIZE,
+ (block_start % PAGE_SIZE) + blocksize,
+ block_start % PAGE_SIZE,
+ from % PAGE_SIZE);
+ }
continue;
}
}
@@ -2048,6 +2055,7 @@ static int __block_commit_write(struct inode *inode, struct page *page,
unsigned blocksize;
struct buffer_head *bh, *head;
+ VM_BUG_ON_PAGE(PageTail(page), page);
bh = head = page_buffers(page);
blocksize = bh->b_size;
@@ -2114,7 +2122,8 @@ int block_write_end(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
unsigned start;
- start = pos & (PAGE_SIZE - 1);
+ page = compound_head(page);
+ start = pos & ~hpage_mask(page);
if (unlikely(copied < len)) {
/*
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 24/41] fs: make block_write_{begin,end}() be able to handle huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
It's more or less straight-forward.
Most changes are around getting offset/len withing page right and zero
out desired part of the page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 53 +++++++++++++++++++++++++++++++----------------------
1 file changed, 31 insertions(+), 22 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 2739f5dae690..7f50e5a63670 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1870,21 +1870,21 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
do {
block_end = block_start + bh->b_size;
- if (buffer_new(bh)) {
- if (block_end > from && block_start < to) {
- if (!PageUptodate(page)) {
- unsigned start, size;
+ if (buffer_new(bh) && block_end > from && block_start < to) {
+ if (!PageUptodate(page)) {
+ unsigned start, size;
- start = max(from, block_start);
- size = min(to, block_end) - start;
+ start = max(from, block_start);
+ size = min(to, block_end) - start;
- zero_user(page, start, size);
- set_buffer_uptodate(bh);
- }
-
- clear_buffer_new(bh);
- mark_buffer_dirty(bh);
+ zero_user(page + block_start / PAGE_SIZE,
+ start % PAGE_SIZE,
+ size);
+ set_buffer_uptodate(bh);
}
+
+ clear_buffer_new(bh);
+ mark_buffer_dirty(bh);
}
block_start = block_end;
@@ -1950,18 +1950,20 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block, struct iomap *iomap)
{
- unsigned from = pos & (PAGE_SIZE - 1);
- unsigned to = from + len;
- struct inode *inode = page->mapping->host;
+ unsigned from, to;
+ struct inode *inode = page_mapping(page)->host;
unsigned block_start, block_end;
sector_t block;
int err = 0;
unsigned blocksize, bbits;
struct buffer_head *bh, *head, *wait[2], **wait_bh=wait;
+ page = compound_head(page);
+ from = pos & ~hpage_mask(page);
+ to = from + len;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_SIZE);
- BUG_ON(to > PAGE_SIZE);
+ BUG_ON(from > hpage_size(page));
+ BUG_ON(to > hpage_size(page));
BUG_ON(from > to);
head = create_page_buffers(page, inode, 0);
@@ -2001,10 +2003,15 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from)
- zero_user_segments(page,
- to, block_end,
- block_start, from);
+ if (block_end > to || block_start < from) {
+ BUG_ON(to - from > PAGE_SIZE);
+ zero_user_segments(page +
+ block_start / PAGE_SIZE,
+ to % PAGE_SIZE,
+ (block_start % PAGE_SIZE) + blocksize,
+ block_start % PAGE_SIZE,
+ from % PAGE_SIZE);
+ }
continue;
}
}
@@ -2048,6 +2055,7 @@ static int __block_commit_write(struct inode *inode, struct page *page,
unsigned blocksize;
struct buffer_head *bh, *head;
+ VM_BUG_ON_PAGE(PageTail(page), page);
bh = head = page_buffers(page);
blocksize = bh->b_size;
@@ -2114,7 +2122,8 @@ int block_write_end(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
unsigned start;
- start = pos & (PAGE_SIZE - 1);
+ page = compound_head(page);
+ start = pos & ~hpage_mask(page);
if (unlikely(copied < len)) {
/*
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 25/41] fs: make block_page_mkwrite() aware about huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Adjust check on whether part of the page beyond file size and apply
compound_head() and page_mapping() where appropriate.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 7f50e5a63670..e53808e790e2 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2502,7 +2502,7 @@ EXPORT_SYMBOL(block_commit_write);
int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
get_block_t get_block)
{
- struct page *page = vmf->page;
+ struct page *page = compound_head(vmf->page);
struct inode *inode = file_inode(vma->vm_file);
unsigned long end;
loff_t size;
@@ -2510,7 +2510,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
lock_page(page);
size = i_size_read(inode);
- if ((page->mapping != inode->i_mapping) ||
+ if ((page_mapping(page) != inode->i_mapping) ||
(page_offset(page) > size)) {
/* We overload EFAULT to mean page got truncated */
ret = -EFAULT;
@@ -2518,10 +2518,10 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
}
/* page is wholly or partially inside EOF */
- if (((page->index + 1) << PAGE_SHIFT) > size)
- end = size & ~PAGE_MASK;
+ if (((page->index + hpage_nr_pages(page)) << PAGE_SHIFT) > size)
+ end = size & ~hpage_mask(page);
else
- end = PAGE_SIZE;
+ end = hpage_size(page);
ret = __block_write_begin(page, 0, end, get_block);
if (!ret)
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 25/41] fs: make block_page_mkwrite() aware about huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Adjust check on whether part of the page beyond file size and apply
compound_head() and page_mapping() where appropriate.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 7f50e5a63670..e53808e790e2 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2502,7 +2502,7 @@ EXPORT_SYMBOL(block_commit_write);
int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
get_block_t get_block)
{
- struct page *page = vmf->page;
+ struct page *page = compound_head(vmf->page);
struct inode *inode = file_inode(vma->vm_file);
unsigned long end;
loff_t size;
@@ -2510,7 +2510,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
lock_page(page);
size = i_size_read(inode);
- if ((page->mapping != inode->i_mapping) ||
+ if ((page_mapping(page) != inode->i_mapping) ||
(page_offset(page) > size)) {
/* We overload EFAULT to mean page got truncated */
ret = -EFAULT;
@@ -2518,10 +2518,10 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
}
/* page is wholly or partially inside EOF */
- if (((page->index + 1) << PAGE_SHIFT) > size)
- end = size & ~PAGE_MASK;
+ if (((page->index + hpage_nr_pages(page)) << PAGE_SHIFT) > size)
+ end = size & ~hpage_mask(page);
else
- end = PAGE_SIZE;
+ end = hpage_size(page);
ret = __block_write_begin(page, 0, end, get_block);
if (!ret)
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 26/41] truncate: make truncate_inode_pages_range() aware about huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
As with shmem_undo_range(), truncate_inode_pages_range() removes huge
pages, if it fully within range.
Partial truncate of huge pages zero out this part of THP.
Unlike with shmem, it doesn't prevent us having holes in the middle of
huge page we still can skip writeback not touched buffers.
With memory-mapped IO we would loose holes in some cases when we have
THP in page cache, since we cannot track access on 4k level in this
case.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 2 +-
mm/truncate.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 88 insertions(+), 9 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index e53808e790e2..20898b051044 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1534,7 +1534,7 @@ void block_invalidatepage(struct page *page, unsigned int offset,
/*
* Check for overflow
*/
- BUG_ON(stop > PAGE_SIZE || stop < length);
+ BUG_ON(stop > hpage_size(page) || stop < length);
head = page_buffers(page);
bh = head;
diff --git a/mm/truncate.c b/mm/truncate.c
index ce904e4b1708..9c339e6255f2 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -90,7 +90,7 @@ void do_invalidatepage(struct page *page, unsigned int offset,
{
void (*invalidatepage)(struct page *, unsigned int, unsigned int);
- invalidatepage = page->mapping->a_ops->invalidatepage;
+ invalidatepage = page_mapping(page)->a_ops->invalidatepage;
#ifdef CONFIG_BLOCK
if (!invalidatepage)
invalidatepage = block_invalidatepage;
@@ -116,7 +116,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
return -EIO;
if (page_has_private(page))
- do_invalidatepage(page, 0, PAGE_SIZE);
+ do_invalidatepage(page, 0, hpage_size(page));
/*
* Some filesystems seem to re-dirty the page even after
@@ -288,6 +288,36 @@ void truncate_inode_pages_range(struct address_space *mapping,
unlock_page(page);
continue;
}
+
+ if (PageTransTail(page)) {
+ /* Middle of THP: zero out the page */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ continue;
+ } else if (PageTransHuge(page)) {
+ if (index == round_down(end, HPAGE_PMD_NR)) {
+ /*
+ * Range ends in the middle of THP:
+ * zero out the page
+ */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ do_invalidatepage(page, 0,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ continue;
+ }
+ index += HPAGE_PMD_NR - 1;
+ i += HPAGE_PMD_NR - 1;
+ }
+
truncate_inode_page(mapping, page);
unlock_page(page);
}
@@ -309,9 +339,12 @@ void truncate_inode_pages_range(struct address_space *mapping,
wait_on_page_writeback(page);
zero_user_segment(page, partial_start, top);
cleancache_invalidate_page(mapping, page);
- if (page_has_private(page))
- do_invalidatepage(page, partial_start,
- top - partial_start);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE + partial_start,
+ top - partial_start);
+ }
unlock_page(page);
put_page(page);
}
@@ -322,9 +355,12 @@ void truncate_inode_pages_range(struct address_space *mapping,
wait_on_page_writeback(page);
zero_user_segment(page, 0, partial_end);
cleancache_invalidate_page(mapping, page);
- if (page_has_private(page))
- do_invalidatepage(page, 0,
- partial_end);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ partial_end);
+ }
unlock_page(page);
put_page(page);
}
@@ -373,6 +409,49 @@ void truncate_inode_pages_range(struct address_space *mapping,
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
wait_on_page_writeback(page);
+
+ if (PageTransTail(page)) {
+ /* Middle of THP: zero out the page */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ /*
+ * Partial thp truncate due 'start' in middle
+ * of THP: don't need to look on these pages
+ * again on !pvec.nr restart.
+ */
+ if (index != round_down(end, HPAGE_PMD_NR))
+ start++;
+ continue;
+ } else if (PageTransHuge(page)) {
+ if (index == round_down(end, HPAGE_PMD_NR)) {
+ /*
+ * Range ends in the middle of THP:
+ * zero out the page
+ */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ do_invalidatepage(page, 0,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ /*
+ * Partial thp truncate due 'end' in
+ * middle of THP: don't need to look on
+ * these pages again restart.
+ */
+ start++;
+ continue;
+ }
+ index += HPAGE_PMD_NR - 1;
+ i += HPAGE_PMD_NR - 1;
+ }
+
truncate_inode_page(mapping, page);
unlock_page(page);
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 26/41] truncate: make truncate_inode_pages_range() aware about huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
As with shmem_undo_range(), truncate_inode_pages_range() removes huge
pages, if it fully within range.
Partial truncate of huge pages zero out this part of THP.
Unlike with shmem, it doesn't prevent us having holes in the middle of
huge page we still can skip writeback not touched buffers.
With memory-mapped IO we would loose holes in some cases when we have
THP in page cache, since we cannot track access on 4k level in this
case.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 2 +-
mm/truncate.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 88 insertions(+), 9 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index e53808e790e2..20898b051044 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1534,7 +1534,7 @@ void block_invalidatepage(struct page *page, unsigned int offset,
/*
* Check for overflow
*/
- BUG_ON(stop > PAGE_SIZE || stop < length);
+ BUG_ON(stop > hpage_size(page) || stop < length);
head = page_buffers(page);
bh = head;
diff --git a/mm/truncate.c b/mm/truncate.c
index ce904e4b1708..9c339e6255f2 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -90,7 +90,7 @@ void do_invalidatepage(struct page *page, unsigned int offset,
{
void (*invalidatepage)(struct page *, unsigned int, unsigned int);
- invalidatepage = page->mapping->a_ops->invalidatepage;
+ invalidatepage = page_mapping(page)->a_ops->invalidatepage;
#ifdef CONFIG_BLOCK
if (!invalidatepage)
invalidatepage = block_invalidatepage;
@@ -116,7 +116,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
return -EIO;
if (page_has_private(page))
- do_invalidatepage(page, 0, PAGE_SIZE);
+ do_invalidatepage(page, 0, hpage_size(page));
/*
* Some filesystems seem to re-dirty the page even after
@@ -288,6 +288,36 @@ void truncate_inode_pages_range(struct address_space *mapping,
unlock_page(page);
continue;
}
+
+ if (PageTransTail(page)) {
+ /* Middle of THP: zero out the page */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ continue;
+ } else if (PageTransHuge(page)) {
+ if (index == round_down(end, HPAGE_PMD_NR)) {
+ /*
+ * Range ends in the middle of THP:
+ * zero out the page
+ */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ do_invalidatepage(page, 0,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ continue;
+ }
+ index += HPAGE_PMD_NR - 1;
+ i += HPAGE_PMD_NR - 1;
+ }
+
truncate_inode_page(mapping, page);
unlock_page(page);
}
@@ -309,9 +339,12 @@ void truncate_inode_pages_range(struct address_space *mapping,
wait_on_page_writeback(page);
zero_user_segment(page, partial_start, top);
cleancache_invalidate_page(mapping, page);
- if (page_has_private(page))
- do_invalidatepage(page, partial_start,
- top - partial_start);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE + partial_start,
+ top - partial_start);
+ }
unlock_page(page);
put_page(page);
}
@@ -322,9 +355,12 @@ void truncate_inode_pages_range(struct address_space *mapping,
wait_on_page_writeback(page);
zero_user_segment(page, 0, partial_end);
cleancache_invalidate_page(mapping, page);
- if (page_has_private(page))
- do_invalidatepage(page, 0,
- partial_end);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ partial_end);
+ }
unlock_page(page);
put_page(page);
}
@@ -373,6 +409,49 @@ void truncate_inode_pages_range(struct address_space *mapping,
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
wait_on_page_writeback(page);
+
+ if (PageTransTail(page)) {
+ /* Middle of THP: zero out the page */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ int off = page - compound_head(page);
+ do_invalidatepage(compound_head(page),
+ off * PAGE_SIZE,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ /*
+ * Partial thp truncate due 'start' in middle
+ * of THP: don't need to look on these pages
+ * again on !pvec.nr restart.
+ */
+ if (index != round_down(end, HPAGE_PMD_NR))
+ start++;
+ continue;
+ } else if (PageTransHuge(page)) {
+ if (index == round_down(end, HPAGE_PMD_NR)) {
+ /*
+ * Range ends in the middle of THP:
+ * zero out the page
+ */
+ clear_highpage(page);
+ if (page_has_private(page)) {
+ do_invalidatepage(page, 0,
+ PAGE_SIZE);
+ }
+ unlock_page(page);
+ /*
+ * Partial thp truncate due 'end' in
+ * middle of THP: don't need to look on
+ * these pages again restart.
+ */
+ start++;
+ continue;
+ }
+ index += HPAGE_PMD_NR - 1;
+ i += HPAGE_PMD_NR - 1;
+ }
+
truncate_inode_page(mapping, page);
unlock_page(page);
}
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 27/41] truncate: make invalidate_inode_pages2_range() aware about huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For huge pages we need to unmap whole range covered by the huge page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/truncate.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index 9c339e6255f2..6a445278aaaf 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -708,27 +708,34 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
continue;
}
wait_on_page_writeback(page);
+ page = compound_head(page);
+
if (page_mapped(page)) {
+ loff_t begin, len;
+
+ begin = page->index << PAGE_SHIFT;
+
if (!did_range_unmap) {
/*
* Zap the rest of the file in one hit.
*/
+ len = (loff_t)(1 + end - page->index) <<
+ PAGE_SHIFT;
+ if (len < hpage_size(page))
+ len = hpage_size(page);
unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- (loff_t)(1 + end - index)
- << PAGE_SHIFT,
- 0);
+ begin, len, 0);
did_range_unmap = 1;
} else {
/*
* Just zap this page
*/
- unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ len = hpage_size(page);
+ unmap_mapping_range(mapping, begin,
+ len, 0 );
}
}
- BUG_ON(page_mapped(page));
+ VM_BUG_ON_PAGE(page_mapped(page), page);
ret2 = do_launder_page(mapping, page);
if (ret2 == 0) {
if (!invalidate_complete_page2(mapping, page))
@@ -737,6 +744,10 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
if (ret2 < 0)
ret = ret2;
unlock_page(page);
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR - 1;
+ break;
+ }
}
pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 27/41] truncate: make invalidate_inode_pages2_range() aware about huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For huge pages we need to unmap whole range covered by the huge page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/truncate.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index 9c339e6255f2..6a445278aaaf 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -708,27 +708,34 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
continue;
}
wait_on_page_writeback(page);
+ page = compound_head(page);
+
if (page_mapped(page)) {
+ loff_t begin, len;
+
+ begin = page->index << PAGE_SHIFT;
+
if (!did_range_unmap) {
/*
* Zap the rest of the file in one hit.
*/
+ len = (loff_t)(1 + end - page->index) <<
+ PAGE_SHIFT;
+ if (len < hpage_size(page))
+ len = hpage_size(page);
unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- (loff_t)(1 + end - index)
- << PAGE_SHIFT,
- 0);
+ begin, len, 0);
did_range_unmap = 1;
} else {
/*
* Just zap this page
*/
- unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ len = hpage_size(page);
+ unmap_mapping_range(mapping, begin,
+ len, 0 );
}
}
- BUG_ON(page_mapped(page));
+ VM_BUG_ON_PAGE(page_mapped(page), page);
ret2 = do_launder_page(mapping, page);
if (ret2 == 0) {
if (!invalidate_complete_page2(mapping, page))
@@ -737,6 +744,10 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
if (ret2 < 0)
ret = ret2;
unlock_page(page);
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR - 1;
+ break;
+ }
}
pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 28/41] mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Naoya Horiguchi, Kirill A . Shutemov
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Currently, hugetlb pages are linked to page cache on the basis of hugepage
offset (derived from vma_hugecache_offset()) for historical reason, which
doesn't match to the generic usage of page cache and requires some routines
to covert page offset <=> hugepage offset in common path. This patch
adjusts code for multi-order radix-tree to avoid the situation.
Main change is on the behavior of page->index for hugetlbfs. Before this
patch, it represented hugepage offset, but with this patch it represents
page offset. So index-related code have to be updated.
Note that hugetlb_fault_mutex_hash() and reservation region handling are
still working with hugepage offset.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
[kirill.shutemov@linux.intel.com: reject fixed]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/hugetlbfs/inode.c | 22 ++++++++++------------
include/linux/pagemap.h | 10 +---------
mm/filemap.c | 30 ++++++++++++++++++------------
mm/hugetlb.c | 19 ++++++-------------
4 files changed, 35 insertions(+), 46 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 4ea71eba40a5..fc918c0e33e9 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -388,8 +388,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
{
struct hstate *h = hstate_inode(inode);
struct address_space *mapping = &inode->i_data;
- const pgoff_t start = lstart >> huge_page_shift(h);
- const pgoff_t end = lend >> huge_page_shift(h);
+ const pgoff_t start = lstart >> PAGE_SHIFT;
+ const pgoff_t end = lend >> PAGE_SHIFT;
struct vm_area_struct pseudo_vma;
struct pagevec pvec;
pgoff_t next;
@@ -447,8 +447,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
i_mmap_lock_write(mapping);
hugetlb_vmdelete_list(&mapping->i_mmap,
- next * pages_per_huge_page(h),
- (next + 1) * pages_per_huge_page(h));
+ next, next + 1);
i_mmap_unlock_write(mapping);
}
@@ -467,7 +466,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
freed++;
if (!truncate_op) {
if (unlikely(hugetlb_unreserve_pages(inode,
- next, next + 1, 1)))
+ (next) << huge_page_order(h),
+ (next + 1) << huge_page_order(h), 1)))
hugetlb_fix_reserve_counts(inode,
rsv_on_error);
}
@@ -552,8 +552,6 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
struct hstate *h = hstate_inode(inode);
struct vm_area_struct pseudo_vma;
struct mm_struct *mm = current->mm;
- loff_t hpage_size = huge_page_size(h);
- unsigned long hpage_shift = huge_page_shift(h);
pgoff_t start, index, end;
int error;
u32 hash;
@@ -569,8 +567,8 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
* For this range, start is rounded down and end is rounded up
* as well as being converted to page offsets.
*/
- start = offset >> hpage_shift;
- end = (offset + len + hpage_size - 1) >> hpage_shift;
+ start = offset >> PAGE_SHIFT;
+ end = (offset + len + huge_page_size(h) - 1) >> PAGE_SHIFT;
inode_lock(inode);
@@ -588,7 +586,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED);
pseudo_vma.vm_file = file;
- for (index = start; index < end; index++) {
+ for (index = start; index < end; index += pages_per_huge_page(h)) {
/*
* This is supposed to be the vaddr where the page is being
* faulted in, but we have no vaddr here.
@@ -609,10 +607,10 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
}
/* Set numa allocation policy based on index */
- hugetlb_set_vma_policy(&pseudo_vma, inode, index);
+ hugetlb_set_vma_policy(&pseudo_vma, inode, index >> huge_page_order(h));
/* addr is the offset within the file (zero based) */
- addr = index * hpage_size;
+ addr = index << PAGE_SHIFT & ~huge_page_mask(h);
/* mutex taken here, fault path and hole punch */
hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 24e14ef1cfe5..de3f732528ea 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -380,15 +380,11 @@ static inline struct page *read_mapping_page(struct address_space *mapping,
/*
* Get the offset in PAGE_SIZE.
- * (TODO: hugepage should have ->index in PAGE_SIZE)
*/
static inline pgoff_t page_to_pgoff(struct page *page)
{
pgoff_t pgoff;
- if (unlikely(PageHeadHuge(page)))
- return page->index << compound_order(page);
-
if (likely(!PageTransTail(page)))
return page->index;
@@ -414,15 +410,11 @@ static inline loff_t page_file_offset(struct page *page)
return ((loff_t)page_file_index(page)) << PAGE_SHIFT;
}
-extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
- unsigned long address);
-
static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
unsigned long address)
{
pgoff_t pgoff;
- if (unlikely(is_vm_hugetlb_page(vma)))
- return linear_hugepage_index(vma, address);
+
pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
pgoff += vma->vm_pgoff;
return pgoff;
diff --git a/mm/filemap.c b/mm/filemap.c
index 429f9a0962b3..71c0bfdcab05 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -114,7 +114,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
struct page *page, void *shadow)
{
struct radix_tree_node *node;
- int nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
+ int nr = hpage_nr_pages(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageTail(page), page);
@@ -668,7 +668,7 @@ static int __add_to_page_cache_locked(struct page *page,
page->index = offset;
spin_lock_irq(&mapping->tree_lock);
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
struct radix_tree_iter iter;
void **slot;
void *p;
@@ -677,7 +677,7 @@ static int __add_to_page_cache_locked(struct page *page,
/* Wipe shadow entires */
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
- if (iter.index >= offset + HPAGE_PMD_NR)
+ if (iter.index >= offset + hpage_nr_pages(page))
break;
p = radix_tree_deref_slot_protected(slot,
@@ -699,10 +699,15 @@ static int __add_to_page_cache_locked(struct page *page,
compound_order(page), page);
if (!error) {
- count_vm_event(THP_FILE_ALLOC);
- mapping->nrpages += HPAGE_PMD_NR;
- *shadowp = NULL;
- __inc_node_page_state(page, NR_FILE_THPS);
+ if (hugetlb) {
+ mapping->nrpages += 1 << compound_order(page);
+ } else if (PageTransHuge(page)) {
+ count_vm_event(THP_FILE_ALLOC);
+ mapping->nrpages += HPAGE_PMD_NR;
+ *shadowp = NULL;
+ __inc_node_page_state(page, NR_FILE_THPS);
+ } else
+ BUG();
}
} else {
error = page_cache_tree_insert(mapping, page, shadowp);
@@ -1144,9 +1149,9 @@ repeat:
}
/* For multi-order entries, find relevant subpage */
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
VM_BUG_ON(offset - page->index < 0);
- VM_BUG_ON(offset - page->index >= HPAGE_PMD_NR);
+ VM_BUG_ON(offset - page->index >= 1 << compound_order(page));
page += offset - page->index;
}
}
@@ -1514,16 +1519,17 @@ repeat:
}
/* For multi-order entries, find relevant subpage */
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
VM_BUG_ON(index - page->index < 0);
- VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ VM_BUG_ON(index - page->index >=
+ 1 << compound_order(page));
page += index - page->index;
}
pages[ret] = page;
if (++ret == nr_pages)
break;
- if (!PageTransCompound(page))
+ if (PageHuge(page) || !PageTransCompound(page))
continue;
for (refs = 0; ret < nr_pages &&
(index + 1) % HPAGE_PMD_NR;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3b6dc790ce78..559cab109895 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -622,13 +622,6 @@ static pgoff_t vma_hugecache_offset(struct hstate *h,
(vma->vm_pgoff >> huge_page_order(h));
}
-pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
- unsigned long address)
-{
- return vma_hugecache_offset(hstate_vma(vma), vma, address);
-}
-EXPORT_SYMBOL_GPL(linear_hugepage_index);
-
/*
* Return the size of the pages allocated when backing a VMA. In the majority
* cases this will be same size as used by the page table entries.
@@ -3486,7 +3479,7 @@ static struct page *hugetlbfs_pagecache_page(struct hstate *h,
pgoff_t idx;
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
return find_lock_page(mapping, idx);
}
@@ -3503,7 +3496,7 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
struct page *page;
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
page = find_get_page(mapping, idx);
if (page)
@@ -3558,7 +3551,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
retry:
page = find_lock_page(mapping, idx);
if (!page) {
- size = i_size_read(mapping->host) >> huge_page_shift(h);
+ size = i_size_read(mapping->host) >> PAGE_SHIFT;
if (idx >= size)
goto out;
page = alloc_huge_page(vma, address, 0);
@@ -3620,7 +3613,7 @@ retry:
ptl = huge_pte_lockptr(h, mm, ptep);
spin_lock(ptl);
- size = i_size_read(mapping->host) >> huge_page_shift(h);
+ size = i_size_read(mapping->host) >> PAGE_SHIFT;
if (idx >= size)
goto backout;
@@ -3667,7 +3660,7 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
if (vma->vm_flags & VM_SHARED) {
key[0] = (unsigned long) mapping;
- key[1] = idx;
+ key[1] = idx >> huge_page_order(h);
} else {
key[0] = (unsigned long) mm;
key[1] = address >> huge_page_shift(h);
@@ -3723,7 +3716,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
}
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
/*
* Serialize hugepage allocation and instantiation, so that we don't
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 28/41] mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Naoya Horiguchi, Kirill A . Shutemov
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Currently, hugetlb pages are linked to page cache on the basis of hugepage
offset (derived from vma_hugecache_offset()) for historical reason, which
doesn't match to the generic usage of page cache and requires some routines
to covert page offset <=> hugepage offset in common path. This patch
adjusts code for multi-order radix-tree to avoid the situation.
Main change is on the behavior of page->index for hugetlbfs. Before this
patch, it represented hugepage offset, but with this patch it represents
page offset. So index-related code have to be updated.
Note that hugetlb_fault_mutex_hash() and reservation region handling are
still working with hugepage offset.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
[kirill.shutemov@linux.intel.com: reject fixed]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/hugetlbfs/inode.c | 22 ++++++++++------------
include/linux/pagemap.h | 10 +---------
mm/filemap.c | 30 ++++++++++++++++++------------
mm/hugetlb.c | 19 ++++++-------------
4 files changed, 35 insertions(+), 46 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 4ea71eba40a5..fc918c0e33e9 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -388,8 +388,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
{
struct hstate *h = hstate_inode(inode);
struct address_space *mapping = &inode->i_data;
- const pgoff_t start = lstart >> huge_page_shift(h);
- const pgoff_t end = lend >> huge_page_shift(h);
+ const pgoff_t start = lstart >> PAGE_SHIFT;
+ const pgoff_t end = lend >> PAGE_SHIFT;
struct vm_area_struct pseudo_vma;
struct pagevec pvec;
pgoff_t next;
@@ -447,8 +447,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
i_mmap_lock_write(mapping);
hugetlb_vmdelete_list(&mapping->i_mmap,
- next * pages_per_huge_page(h),
- (next + 1) * pages_per_huge_page(h));
+ next, next + 1);
i_mmap_unlock_write(mapping);
}
@@ -467,7 +466,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
freed++;
if (!truncate_op) {
if (unlikely(hugetlb_unreserve_pages(inode,
- next, next + 1, 1)))
+ (next) << huge_page_order(h),
+ (next + 1) << huge_page_order(h), 1)))
hugetlb_fix_reserve_counts(inode,
rsv_on_error);
}
@@ -552,8 +552,6 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
struct hstate *h = hstate_inode(inode);
struct vm_area_struct pseudo_vma;
struct mm_struct *mm = current->mm;
- loff_t hpage_size = huge_page_size(h);
- unsigned long hpage_shift = huge_page_shift(h);
pgoff_t start, index, end;
int error;
u32 hash;
@@ -569,8 +567,8 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
* For this range, start is rounded down and end is rounded up
* as well as being converted to page offsets.
*/
- start = offset >> hpage_shift;
- end = (offset + len + hpage_size - 1) >> hpage_shift;
+ start = offset >> PAGE_SHIFT;
+ end = (offset + len + huge_page_size(h) - 1) >> PAGE_SHIFT;
inode_lock(inode);
@@ -588,7 +586,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED);
pseudo_vma.vm_file = file;
- for (index = start; index < end; index++) {
+ for (index = start; index < end; index += pages_per_huge_page(h)) {
/*
* This is supposed to be the vaddr where the page is being
* faulted in, but we have no vaddr here.
@@ -609,10 +607,10 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
}
/* Set numa allocation policy based on index */
- hugetlb_set_vma_policy(&pseudo_vma, inode, index);
+ hugetlb_set_vma_policy(&pseudo_vma, inode, index >> huge_page_order(h));
/* addr is the offset within the file (zero based) */
- addr = index * hpage_size;
+ addr = index << PAGE_SHIFT & ~huge_page_mask(h);
/* mutex taken here, fault path and hole punch */
hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 24e14ef1cfe5..de3f732528ea 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -380,15 +380,11 @@ static inline struct page *read_mapping_page(struct address_space *mapping,
/*
* Get the offset in PAGE_SIZE.
- * (TODO: hugepage should have ->index in PAGE_SIZE)
*/
static inline pgoff_t page_to_pgoff(struct page *page)
{
pgoff_t pgoff;
- if (unlikely(PageHeadHuge(page)))
- return page->index << compound_order(page);
-
if (likely(!PageTransTail(page)))
return page->index;
@@ -414,15 +410,11 @@ static inline loff_t page_file_offset(struct page *page)
return ((loff_t)page_file_index(page)) << PAGE_SHIFT;
}
-extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
- unsigned long address);
-
static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
unsigned long address)
{
pgoff_t pgoff;
- if (unlikely(is_vm_hugetlb_page(vma)))
- return linear_hugepage_index(vma, address);
+
pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
pgoff += vma->vm_pgoff;
return pgoff;
diff --git a/mm/filemap.c b/mm/filemap.c
index 429f9a0962b3..71c0bfdcab05 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -114,7 +114,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
struct page *page, void *shadow)
{
struct radix_tree_node *node;
- int nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
+ int nr = hpage_nr_pages(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageTail(page), page);
@@ -668,7 +668,7 @@ static int __add_to_page_cache_locked(struct page *page,
page->index = offset;
spin_lock_irq(&mapping->tree_lock);
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
struct radix_tree_iter iter;
void **slot;
void *p;
@@ -677,7 +677,7 @@ static int __add_to_page_cache_locked(struct page *page,
/* Wipe shadow entires */
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
- if (iter.index >= offset + HPAGE_PMD_NR)
+ if (iter.index >= offset + hpage_nr_pages(page))
break;
p = radix_tree_deref_slot_protected(slot,
@@ -699,10 +699,15 @@ static int __add_to_page_cache_locked(struct page *page,
compound_order(page), page);
if (!error) {
- count_vm_event(THP_FILE_ALLOC);
- mapping->nrpages += HPAGE_PMD_NR;
- *shadowp = NULL;
- __inc_node_page_state(page, NR_FILE_THPS);
+ if (hugetlb) {
+ mapping->nrpages += 1 << compound_order(page);
+ } else if (PageTransHuge(page)) {
+ count_vm_event(THP_FILE_ALLOC);
+ mapping->nrpages += HPAGE_PMD_NR;
+ *shadowp = NULL;
+ __inc_node_page_state(page, NR_FILE_THPS);
+ } else
+ BUG();
}
} else {
error = page_cache_tree_insert(mapping, page, shadowp);
@@ -1144,9 +1149,9 @@ repeat:
}
/* For multi-order entries, find relevant subpage */
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
VM_BUG_ON(offset - page->index < 0);
- VM_BUG_ON(offset - page->index >= HPAGE_PMD_NR);
+ VM_BUG_ON(offset - page->index >= 1 << compound_order(page));
page += offset - page->index;
}
}
@@ -1514,16 +1519,17 @@ repeat:
}
/* For multi-order entries, find relevant subpage */
- if (PageTransHuge(page)) {
+ if (PageCompound(page)) {
VM_BUG_ON(index - page->index < 0);
- VM_BUG_ON(index - page->index >= HPAGE_PMD_NR);
+ VM_BUG_ON(index - page->index >=
+ 1 << compound_order(page));
page += index - page->index;
}
pages[ret] = page;
if (++ret == nr_pages)
break;
- if (!PageTransCompound(page))
+ if (PageHuge(page) || !PageTransCompound(page))
continue;
for (refs = 0; ret < nr_pages &&
(index + 1) % HPAGE_PMD_NR;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3b6dc790ce78..559cab109895 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -622,13 +622,6 @@ static pgoff_t vma_hugecache_offset(struct hstate *h,
(vma->vm_pgoff >> huge_page_order(h));
}
-pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
- unsigned long address)
-{
- return vma_hugecache_offset(hstate_vma(vma), vma, address);
-}
-EXPORT_SYMBOL_GPL(linear_hugepage_index);
-
/*
* Return the size of the pages allocated when backing a VMA. In the majority
* cases this will be same size as used by the page table entries.
@@ -3486,7 +3479,7 @@ static struct page *hugetlbfs_pagecache_page(struct hstate *h,
pgoff_t idx;
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
return find_lock_page(mapping, idx);
}
@@ -3503,7 +3496,7 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
struct page *page;
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
page = find_get_page(mapping, idx);
if (page)
@@ -3558,7 +3551,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
retry:
page = find_lock_page(mapping, idx);
if (!page) {
- size = i_size_read(mapping->host) >> huge_page_shift(h);
+ size = i_size_read(mapping->host) >> PAGE_SHIFT;
if (idx >= size)
goto out;
page = alloc_huge_page(vma, address, 0);
@@ -3620,7 +3613,7 @@ retry:
ptl = huge_pte_lockptr(h, mm, ptep);
spin_lock(ptl);
- size = i_size_read(mapping->host) >> huge_page_shift(h);
+ size = i_size_read(mapping->host) >> PAGE_SHIFT;
if (idx >= size)
goto backout;
@@ -3667,7 +3660,7 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
if (vma->vm_flags & VM_SHARED) {
key[0] = (unsigned long) mapping;
- key[1] = idx;
+ key[1] = idx >> huge_page_order(h);
} else {
key[0] = (unsigned long) mm;
key[1] = address >> huge_page_shift(h);
@@ -3723,7 +3716,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
}
mapping = vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, vma, address);
+ idx = linear_page_index(vma, address);
/*
* Serialize hugepage allocation and instantiation, so that we don't
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 29/41] ext4: make ext4_mpage_readpages() hugepage-aware
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This patch modifies ext4_mpage_readpages() to deal with huge pages.
We read out 2M at once, so we have to alloc (HPAGE_PMD_NR *
blocks_per_page) sector_t for that. I'm not entirely happy with kmalloc
in this codepath, but don't see any other option.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/readpage.c | 38 ++++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index a81b829d56de..6d7cbddceeb2 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -104,12 +104,12 @@ int ext4_mpage_readpages(struct address_space *mapping,
struct inode *inode = mapping->host;
const unsigned blkbits = inode->i_blkbits;
- const unsigned blocks_per_page = PAGE_SIZE >> blkbits;
const unsigned blocksize = 1 << blkbits;
sector_t block_in_file;
sector_t last_block;
sector_t last_block_in_file;
- sector_t blocks[MAX_BUF_PER_PAGE];
+ sector_t blocks_on_stack[MAX_BUF_PER_PAGE];
+ sector_t *blocks = blocks_on_stack;
unsigned page_block;
struct block_device *bdev = inode->i_sb->s_bdev;
int length;
@@ -122,8 +122,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
map.m_flags = 0;
for (; nr_pages; nr_pages--) {
- int fully_mapped = 1;
- unsigned first_hole = blocks_per_page;
+ int fully_mapped = 1, nr = nr_pages;
+ unsigned blocks_per_page = PAGE_SIZE >> blkbits;
+ unsigned first_hole;
prefetchw(&page->flags);
if (pages) {
@@ -138,10 +139,31 @@ int ext4_mpage_readpages(struct address_space *mapping,
goto confused;
block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits);
- last_block = block_in_file + nr_pages * blocks_per_page;
+
+ if (PageTransHuge(page)) {
+ BUILD_BUG_ON(BIO_MAX_PAGES < HPAGE_PMD_NR);
+ nr = HPAGE_PMD_NR * blocks_per_page;
+ /* XXX: need a better solution ? */
+ blocks = kmalloc(sizeof(sector_t) * nr, GFP_NOFS);
+ if (!blocks) {
+ if (pages) {
+ delete_from_page_cache(page);
+ goto next_page;
+ }
+ return -ENOMEM;
+ }
+
+ blocks_per_page *= HPAGE_PMD_NR;
+ last_block = block_in_file + blocks_per_page;
+ } else {
+ blocks = blocks_on_stack;
+ last_block = block_in_file + nr * blocks_per_page;
+ }
+
last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
if (last_block > last_block_in_file)
last_block = last_block_in_file;
+ first_hole = blocks_per_page;
page_block = 0;
/*
@@ -213,6 +235,8 @@ int ext4_mpage_readpages(struct address_space *mapping,
}
}
if (first_hole != blocks_per_page) {
+ if (PageTransHuge(page))
+ goto confused;
zero_user_segment(page, first_hole << blkbits,
PAGE_SIZE);
if (first_hole == 0) {
@@ -248,7 +272,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
goto set_error_page;
}
bio = bio_alloc(GFP_KERNEL,
- min_t(int, nr_pages, BIO_MAX_PAGES));
+ min_t(int, nr, BIO_MAX_PAGES));
if (!bio) {
if (ctx)
fscrypt_release_ctx(ctx);
@@ -289,5 +313,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
BUG_ON(pages && !list_empty(pages));
if (bio)
submit_bio(bio);
+ if (blocks != blocks_on_stack)
+ kfree(blocks);
return 0;
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 29/41] ext4: make ext4_mpage_readpages() hugepage-aware
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
This patch modifies ext4_mpage_readpages() to deal with huge pages.
We read out 2M at once, so we have to alloc (HPAGE_PMD_NR *
blocks_per_page) sector_t for that. I'm not entirely happy with kmalloc
in this codepath, but don't see any other option.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/readpage.c | 38 ++++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index a81b829d56de..6d7cbddceeb2 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -104,12 +104,12 @@ int ext4_mpage_readpages(struct address_space *mapping,
struct inode *inode = mapping->host;
const unsigned blkbits = inode->i_blkbits;
- const unsigned blocks_per_page = PAGE_SIZE >> blkbits;
const unsigned blocksize = 1 << blkbits;
sector_t block_in_file;
sector_t last_block;
sector_t last_block_in_file;
- sector_t blocks[MAX_BUF_PER_PAGE];
+ sector_t blocks_on_stack[MAX_BUF_PER_PAGE];
+ sector_t *blocks = blocks_on_stack;
unsigned page_block;
struct block_device *bdev = inode->i_sb->s_bdev;
int length;
@@ -122,8 +122,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
map.m_flags = 0;
for (; nr_pages; nr_pages--) {
- int fully_mapped = 1;
- unsigned first_hole = blocks_per_page;
+ int fully_mapped = 1, nr = nr_pages;
+ unsigned blocks_per_page = PAGE_SIZE >> blkbits;
+ unsigned first_hole;
prefetchw(&page->flags);
if (pages) {
@@ -138,10 +139,31 @@ int ext4_mpage_readpages(struct address_space *mapping,
goto confused;
block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits);
- last_block = block_in_file + nr_pages * blocks_per_page;
+
+ if (PageTransHuge(page)) {
+ BUILD_BUG_ON(BIO_MAX_PAGES < HPAGE_PMD_NR);
+ nr = HPAGE_PMD_NR * blocks_per_page;
+ /* XXX: need a better solution ? */
+ blocks = kmalloc(sizeof(sector_t) * nr, GFP_NOFS);
+ if (!blocks) {
+ if (pages) {
+ delete_from_page_cache(page);
+ goto next_page;
+ }
+ return -ENOMEM;
+ }
+
+ blocks_per_page *= HPAGE_PMD_NR;
+ last_block = block_in_file + blocks_per_page;
+ } else {
+ blocks = blocks_on_stack;
+ last_block = block_in_file + nr * blocks_per_page;
+ }
+
last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
if (last_block > last_block_in_file)
last_block = last_block_in_file;
+ first_hole = blocks_per_page;
page_block = 0;
/*
@@ -213,6 +235,8 @@ int ext4_mpage_readpages(struct address_space *mapping,
}
}
if (first_hole != blocks_per_page) {
+ if (PageTransHuge(page))
+ goto confused;
zero_user_segment(page, first_hole << blkbits,
PAGE_SIZE);
if (first_hole == 0) {
@@ -248,7 +272,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
goto set_error_page;
}
bio = bio_alloc(GFP_KERNEL,
- min_t(int, nr_pages, BIO_MAX_PAGES));
+ min_t(int, nr, BIO_MAX_PAGES));
if (!bio) {
if (ctx)
fscrypt_release_ctx(ctx);
@@ -289,5 +313,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
BUG_ON(pages && !list_empty(pages));
if (bio)
submit_bio(bio);
+ if (blocks != blocks_on_stack)
+ kfree(blocks);
return 0;
}
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 30/41] ext4: make ext4_writepage() work on huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Change ext4_writepage() and underlying ext4_bio_write_page().
It basically removes assumption on page size, infer it from struct page
instead.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 10 +++++-----
fs/ext4/page-io.c | 11 +++++++++--
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3131747199e1..f585f9160a96 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2020,10 +2020,10 @@ static int ext4_writepage(struct page *page,
trace_ext4_writepage(page);
size = i_size_read(inode);
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
page_bufs = page_buffers(page);
/*
@@ -2047,7 +2047,7 @@ static int ext4_writepage(struct page *page,
ext4_bh_delay_or_unwritten)) {
redirty_page_for_writepage(wbc, page);
if ((current->flags & PF_MEMALLOC) ||
- (inode->i_sb->s_blocksize == PAGE_SIZE)) {
+ (inode->i_sb->s_blocksize == hpage_size(page))) {
/*
* For memory cleaning there's no point in writing only
* some buffers. So just bail out. Warn if we came here
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index a6132a730967..952957ee48b7 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -415,6 +415,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
+ BUG_ON(PageTail(page));
if (keep_towrite)
set_page_writeback_keepwrite(page);
@@ -431,8 +432,14 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- if (len < PAGE_SIZE)
- zero_user_segment(page, len, PAGE_SIZE);
+ if (len < hpage_size(page)) {
+ page += len / PAGE_SIZE;
+ if (len % PAGE_SIZE)
+ zero_user_segment(page, len % PAGE_SIZE, PAGE_SIZE);
+ while (page + 1 == compound_head(page))
+ clear_highpage(++page);
+ page = compound_head(page);
+ }
/*
* In the first loop we prepare and mark buffers to submit. We have to
* mark all buffers in the page before submitting so that
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 30/41] ext4: make ext4_writepage() work on huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Change ext4_writepage() and underlying ext4_bio_write_page().
It basically removes assumption on page size, infer it from struct page
instead.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 10 +++++-----
fs/ext4/page-io.c | 11 +++++++++--
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3131747199e1..f585f9160a96 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2020,10 +2020,10 @@ static int ext4_writepage(struct page *page,
trace_ext4_writepage(page);
size = i_size_read(inode);
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
page_bufs = page_buffers(page);
/*
@@ -2047,7 +2047,7 @@ static int ext4_writepage(struct page *page,
ext4_bh_delay_or_unwritten)) {
redirty_page_for_writepage(wbc, page);
if ((current->flags & PF_MEMALLOC) ||
- (inode->i_sb->s_blocksize == PAGE_SIZE)) {
+ (inode->i_sb->s_blocksize == hpage_size(page))) {
/*
* For memory cleaning there's no point in writing only
* some buffers. So just bail out. Warn if we came here
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index a6132a730967..952957ee48b7 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -415,6 +415,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
+ BUG_ON(PageTail(page));
if (keep_towrite)
set_page_writeback_keepwrite(page);
@@ -431,8 +432,14 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- if (len < PAGE_SIZE)
- zero_user_segment(page, len, PAGE_SIZE);
+ if (len < hpage_size(page)) {
+ page += len / PAGE_SIZE;
+ if (len % PAGE_SIZE)
+ zero_user_segment(page, len % PAGE_SIZE, PAGE_SIZE);
+ while (page + 1 == compound_head(page))
+ clear_highpage(++page);
+ page = compound_head(page);
+ }
/*
* In the first loop we prepare and mark buffers to submit. We have to
* mark all buffers in the page before submitting so that
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 31/41] ext4: handle huge pages in ext4_page_mkwrite()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Trivial: remove assumption on page size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f585f9160a96..cd435d4a10f0 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5646,7 +5646,7 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh)
int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- struct page *page = vmf->page;
+ struct page *page = compound_head(vmf->page);
loff_t size;
unsigned long len;
int ret;
@@ -5682,10 +5682,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
goto out;
}
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
+
/*
* Return if we have all the buffers mapped. This avoids the need to do
* journal_start/journal_stop which can block and take a long time
@@ -5716,7 +5716,8 @@ retry_alloc:
ret = block_page_mkwrite(vma, vmf, get_block);
if (!ret && ext4_should_journal_data(inode)) {
if (ext4_walk_page_buffers(handle, page_buffers(page), 0,
- PAGE_SIZE, NULL, do_journal_get_write_access)) {
+ hpage_size(page), NULL,
+ do_journal_get_write_access)) {
unlock_page(page);
ret = VM_FAULT_SIGBUS;
ext4_journal_stop(handle);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 31/41] ext4: handle huge pages in ext4_page_mkwrite()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Trivial: remove assumption on page size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f585f9160a96..cd435d4a10f0 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5646,7 +5646,7 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh)
int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- struct page *page = vmf->page;
+ struct page *page = compound_head(vmf->page);
loff_t size;
unsigned long len;
int ret;
@@ -5682,10 +5682,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
goto out;
}
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
+
/*
* Return if we have all the buffers mapped. This avoids the need to do
* journal_start/journal_stop which can block and take a long time
@@ -5716,7 +5716,8 @@ retry_alloc:
ret = block_page_mkwrite(vma, vmf, get_block);
if (!ret && ext4_should_journal_data(inode)) {
if (ext4_walk_page_buffers(handle, page_buffers(page), 0,
- PAGE_SIZE, NULL, do_journal_get_write_access)) {
+ hpage_size(page), NULL,
+ do_journal_get_write_access)) {
unlock_page(page);
ret = VM_FAULT_SIGBUS;
ext4_journal_stop(handle);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 32/41] ext4: handle huge pages in __ext4_block_zero_page_range()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
As the function handles zeroing range only within one block, the
required changes are trivial, just remove assuption on page size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cd435d4a10f0..bee21fffbfb9 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3679,7 +3679,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
ext4_fsblk_t index = from >> PAGE_SHIFT;
- unsigned offset = from & (PAGE_SIZE-1);
+ unsigned offset;
unsigned blocksize, pos;
ext4_lblk_t iblock;
struct inode *inode = mapping->host;
@@ -3692,6 +3692,9 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (!page)
return -ENOMEM;
+ page = compound_head(page);
+ offset = from & ~hpage_mask(page);
+
blocksize = inode->i_sb->s_blocksize;
iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
@@ -3746,7 +3749,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (err)
goto unlock;
}
- zero_user(page, offset, length);
+ zero_user(page + offset / PAGE_SIZE, offset % PAGE_SIZE, length);
BUFFER_TRACE(bh, "zeroed end of block");
if (ext4_should_journal_data(inode)) {
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 32/41] ext4: handle huge pages in __ext4_block_zero_page_range()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
As the function handles zeroing range only within one block, the
required changes are trivial, just remove assuption on page size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cd435d4a10f0..bee21fffbfb9 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3679,7 +3679,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
ext4_fsblk_t index = from >> PAGE_SHIFT;
- unsigned offset = from & (PAGE_SIZE-1);
+ unsigned offset;
unsigned blocksize, pos;
ext4_lblk_t iblock;
struct inode *inode = mapping->host;
@@ -3692,6 +3692,9 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (!page)
return -ENOMEM;
+ page = compound_head(page);
+ offset = from & ~hpage_mask(page);
+
blocksize = inode->i_sb->s_blocksize;
iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
@@ -3746,7 +3749,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (err)
goto unlock;
}
- zero_user(page, offset, length);
+ zero_user(page + offset / PAGE_SIZE, offset % PAGE_SIZE, length);
BUFFER_TRACE(bh, "zeroed end of block");
if (ext4_should_journal_data(inode)) {
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 33/41] ext4: make ext4_block_write_begin() aware about huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
It simply matches changes to __block_write_begin_int().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bee21fffbfb9..1c325f62e766 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1079,9 +1079,8 @@ int do_journal_get_write_access(handle_t *handle,
static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block)
{
- unsigned from = pos & (PAGE_SIZE - 1);
- unsigned to = from + len;
- struct inode *inode = page->mapping->host;
+ unsigned from, to;
+ struct inode *inode = page_mapping(page)->host;
unsigned block_start, block_end;
sector_t block;
int err = 0;
@@ -1090,9 +1089,12 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
bool decrypt = false;
+ page = compound_head(page);
+ from = pos & ~hpage_mask(page);
+ to = from + len;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_SIZE);
- BUG_ON(to > PAGE_SIZE);
+ BUG_ON(from > hpage_size(page));
+ BUG_ON(to > hpage_size(page));
BUG_ON(from > to);
if (!page_has_buffers(page))
@@ -1127,9 +1129,15 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from)
- zero_user_segments(page, to, block_end,
- block_start, from);
+ if (block_end > to || block_start < from) {
+ BUG_ON(to - from > PAGE_SIZE);
+ zero_user_segments(page +
+ block_start / PAGE_SIZE,
+ to % PAGE_SIZE,
+ (block_start % PAGE_SIZE) + blocksize,
+ block_start % PAGE_SIZE,
+ from % PAGE_SIZE);
+ }
continue;
}
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 33/41] ext4: make ext4_block_write_begin() aware about huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
It simply matches changes to __block_write_begin_int().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bee21fffbfb9..1c325f62e766 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1079,9 +1079,8 @@ int do_journal_get_write_access(handle_t *handle,
static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block)
{
- unsigned from = pos & (PAGE_SIZE - 1);
- unsigned to = from + len;
- struct inode *inode = page->mapping->host;
+ unsigned from, to;
+ struct inode *inode = page_mapping(page)->host;
unsigned block_start, block_end;
sector_t block;
int err = 0;
@@ -1090,9 +1089,12 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
bool decrypt = false;
+ page = compound_head(page);
+ from = pos & ~hpage_mask(page);
+ to = from + len;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_SIZE);
- BUG_ON(to > PAGE_SIZE);
+ BUG_ON(from > hpage_size(page));
+ BUG_ON(to > hpage_size(page));
BUG_ON(from > to);
if (!page_has_buffers(page))
@@ -1127,9 +1129,15 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from)
- zero_user_segments(page, to, block_end,
- block_start, from);
+ if (block_end > to || block_start < from) {
+ BUG_ON(to - from > PAGE_SIZE);
+ zero_user_segments(page +
+ block_start / PAGE_SIZE,
+ to % PAGE_SIZE,
+ (block_start % PAGE_SIZE) + blocksize,
+ block_start % PAGE_SIZE,
+ from % PAGE_SIZE);
+ }
continue;
}
}
--
2.8.1
--
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the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 34/41] ext4: handle huge pages in ext4_da_write_end()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Call ext4_da_should_update_i_disksize() for head page with offset
relative to head page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1c325f62e766..0133f6fc4bb8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3006,7 +3006,6 @@ static int ext4_da_write_end(struct file *file,
int ret = 0, ret2;
handle_t *handle = ext4_journal_current_handle();
loff_t new_i_size;
- unsigned long start, end;
int write_mode = (int)(unsigned long)fsdata;
if (write_mode == FALL_BACK_TO_NONDELALLOC)
@@ -3014,8 +3013,6 @@ static int ext4_da_write_end(struct file *file,
len, copied, page, fsdata);
trace_ext4_da_write_end(inode, pos, len, copied);
- start = pos & (PAGE_SIZE - 1);
- end = start + copied - 1;
/*
* generic_write_end() will run mark_inode_dirty() if i_size
@@ -3024,8 +3021,10 @@ static int ext4_da_write_end(struct file *file,
*/
new_i_size = pos + copied;
if (copied && new_i_size > EXT4_I(inode)->i_disksize) {
+ struct page *head = compound_head(page);
+ unsigned long end = (pos & ~hpage_mask(head)) + copied - 1;
if (ext4_has_inline_data(inode) ||
- ext4_da_should_update_i_disksize(page, end)) {
+ ext4_da_should_update_i_disksize(head, end)) {
ext4_update_i_disksize(inode, new_i_size);
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 34/41] ext4: handle huge pages in ext4_da_write_end()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Call ext4_da_should_update_i_disksize() for head page with offset
relative to head page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1c325f62e766..0133f6fc4bb8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3006,7 +3006,6 @@ static int ext4_da_write_end(struct file *file,
int ret = 0, ret2;
handle_t *handle = ext4_journal_current_handle();
loff_t new_i_size;
- unsigned long start, end;
int write_mode = (int)(unsigned long)fsdata;
if (write_mode == FALL_BACK_TO_NONDELALLOC)
@@ -3014,8 +3013,6 @@ static int ext4_da_write_end(struct file *file,
len, copied, page, fsdata);
trace_ext4_da_write_end(inode, pos, len, copied);
- start = pos & (PAGE_SIZE - 1);
- end = start + copied - 1;
/*
* generic_write_end() will run mark_inode_dirty() if i_size
@@ -3024,8 +3021,10 @@ static int ext4_da_write_end(struct file *file,
*/
new_i_size = pos + copied;
if (copied && new_i_size > EXT4_I(inode)->i_disksize) {
+ struct page *head = compound_head(page);
+ unsigned long end = (pos & ~hpage_mask(head)) + copied - 1;
if (ext4_has_inline_data(inode) ||
- ext4_da_should_update_i_disksize(page, end)) {
+ ext4_da_should_update_i_disksize(head, end)) {
ext4_update_i_disksize(inode, new_i_size);
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 35/41] ext4: make ext4_da_page_release_reservation() aware about huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For huge pages 'stop' must be within HPAGE_PMD_SIZE.
Let's use hpage_size() in the BUG_ON().
We also need to change how we calculate lblk for cluster deallocation.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0133f6fc4bb8..84ccb4469e0b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1558,7 +1558,7 @@ static void ext4_da_page_release_reservation(struct page *page,
int num_clusters;
ext4_fsblk_t lblk;
- BUG_ON(stop > PAGE_SIZE || stop < length);
+ BUG_ON(stop > hpage_size(page) || stop < length);
head = page_buffers(page);
bh = head;
@@ -1593,7 +1593,8 @@ static void ext4_da_page_release_reservation(struct page *page,
* need to release the reserved space for that cluster. */
num_clusters = EXT4_NUM_B2C(sbi, to_release);
while (num_clusters > 0) {
- lblk = (page->index << (PAGE_SHIFT - inode->i_blkbits)) +
+ lblk = ((page->index + offset / PAGE_SIZE) <<
+ (PAGE_SHIFT - inode->i_blkbits)) +
((num_clusters - 1) << sbi->s_cluster_bits);
if (sbi->s_cluster_ratio == 1 ||
!ext4_find_delalloc_cluster(inode, lblk))
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 35/41] ext4: make ext4_da_page_release_reservation() aware about huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
For huge pages 'stop' must be within HPAGE_PMD_SIZE.
Let's use hpage_size() in the BUG_ON().
We also need to change how we calculate lblk for cluster deallocation.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0133f6fc4bb8..84ccb4469e0b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1558,7 +1558,7 @@ static void ext4_da_page_release_reservation(struct page *page,
int num_clusters;
ext4_fsblk_t lblk;
- BUG_ON(stop > PAGE_SIZE || stop < length);
+ BUG_ON(stop > hpage_size(page) || stop < length);
head = page_buffers(page);
bh = head;
@@ -1593,7 +1593,8 @@ static void ext4_da_page_release_reservation(struct page *page,
* need to release the reserved space for that cluster. */
num_clusters = EXT4_NUM_B2C(sbi, to_release);
while (num_clusters > 0) {
- lblk = (page->index << (PAGE_SHIFT - inode->i_blkbits)) +
+ lblk = ((page->index + offset / PAGE_SIZE) <<
+ (PAGE_SHIFT - inode->i_blkbits)) +
((num_clusters - 1) << sbi->s_cluster_bits);
if (sbi->s_cluster_ratio == 1 ||
!ext4_find_delalloc_cluster(inode, lblk))
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 36/41] ext4: handle writeback with huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Modify mpage_map_and_submit_buffers() and mpage_release_unused_pages()
to deal with huge pages.
Mostly result of try-and-error. Critical view would be appriciated.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 60 +++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 43 insertions(+), 17 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 84ccb4469e0b..0a3aee4a57f7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1652,18 +1652,31 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
+ struct page *page = compound_head(pvec.pages[i]);
+
if (page->index > end)
break;
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
if (invalidate) {
- block_invalidatepage(page, 0, PAGE_SIZE);
+ unsigned long offset, len;
+
+ offset = (index % hpage_nr_pages(page));
+ len = min_t(unsigned long, end - page->index,
+ hpage_nr_pages(page));
+
+ block_invalidatepage(page, offset << PAGE_SHIFT,
+ len << PAGE_SHIFT);
ClearPageUptodate(page);
}
unlock_page(page);
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR;
+ goto release;
+ }
}
index = pvec.pages[nr_pages - 1]->index + 1;
+release:
pagevec_release(&pvec);
}
}
@@ -2097,16 +2110,16 @@ static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
loff_t size = i_size_read(mpd->inode);
int err;
- BUG_ON(page->index != mpd->first_page);
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+ page = compound_head(page);
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
+
clear_page_dirty_for_io(page);
err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc, false);
if (!err)
- mpd->wbc->nr_to_write--;
- mpd->first_page++;
+ mpd->wbc->nr_to_write -= hpage_nr_pages(page);
+ mpd->first_page = round_up(mpd->first_page + 1, hpage_nr_pages(page));
return err;
}
@@ -2254,12 +2267,16 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
+ unsigned long diff;
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
break;
/* Up to 'end' pages must be contiguous */
- BUG_ON(page->index != start);
+ BUG_ON(page_to_pgoff(page) != start);
+ diff = (page - compound_head(page)) << bpp_bits;
bh = head = page_buffers(page);
+ while (diff--)
+ bh = bh->b_this_page;
do {
if (lblk < mpd->map.m_lblk)
continue;
@@ -2296,7 +2313,10 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
* supports blocksize < pagesize as we will try to
* convert potentially unmapped parts of inode.
*/
- mpd->io_submit.io_end->size += PAGE_SIZE;
+ if (PageTransCompound(page))
+ mpd->io_submit.io_end->size += HPAGE_PMD_SIZE;
+ else
+ mpd->io_submit.io_end->size += PAGE_SIZE;
/* Page fully mapped - let IO run! */
err = mpage_submit_page(mpd, page);
if (err < 0) {
@@ -2304,6 +2324,10 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
return err;
}
start++;
+ if (PageTransCompound(page)) {
+ start = round_up(start, HPAGE_PMD_NR);
+ break;
+ }
}
pagevec_release(&pvec);
}
@@ -2543,7 +2567,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
* mapping. However, page->index will not change
* because we have a reference on the page.
*/
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
goto out;
/*
@@ -2558,7 +2582,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
goto out;
/* If we can't merge this page, we are done. */
- if (mpd->map.m_len > 0 && mpd->next_page != page->index)
+ if (mpd->map.m_len > 0 && mpd->next_page != page_to_pgoff(page))
goto out;
lock_page(page);
@@ -2572,7 +2596,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
if (!PageDirty(page) ||
(PageWriteback(page) &&
(mpd->wbc->sync_mode == WB_SYNC_NONE)) ||
- unlikely(page->mapping != mapping)) {
+ unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
continue;
}
@@ -2581,8 +2605,10 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
BUG_ON(PageWriteback(page));
if (mpd->map.m_len == 0)
- mpd->first_page = page->index;
- mpd->next_page = page->index + 1;
+ mpd->first_page = page_to_pgoff(page);
+ page = compound_head(page);
+ mpd->next_page = round_up(page->index + 1,
+ hpage_nr_pages(page));
/* Add all dirty buffers to mpd */
lblk = ((ext4_lblk_t)page->index) <<
(PAGE_SHIFT - blkbits);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 36/41] ext4: handle writeback with huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Modify mpage_map_and_submit_buffers() and mpage_release_unused_pages()
to deal with huge pages.
Mostly result of try-and-error. Critical view would be appriciated.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/inode.c | 60 +++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 43 insertions(+), 17 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 84ccb4469e0b..0a3aee4a57f7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1652,18 +1652,31 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
+ struct page *page = compound_head(pvec.pages[i]);
+
if (page->index > end)
break;
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
if (invalidate) {
- block_invalidatepage(page, 0, PAGE_SIZE);
+ unsigned long offset, len;
+
+ offset = (index % hpage_nr_pages(page));
+ len = min_t(unsigned long, end - page->index,
+ hpage_nr_pages(page));
+
+ block_invalidatepage(page, offset << PAGE_SHIFT,
+ len << PAGE_SHIFT);
ClearPageUptodate(page);
}
unlock_page(page);
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR;
+ goto release;
+ }
}
index = pvec.pages[nr_pages - 1]->index + 1;
+release:
pagevec_release(&pvec);
}
}
@@ -2097,16 +2110,16 @@ static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
loff_t size = i_size_read(mpd->inode);
int err;
- BUG_ON(page->index != mpd->first_page);
- if (page->index == size >> PAGE_SHIFT)
- len = size & ~PAGE_MASK;
- else
- len = PAGE_SIZE;
+ page = compound_head(page);
+ len = hpage_size(page);
+ if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+ len = size & ~hpage_mask(page);
+
clear_page_dirty_for_io(page);
err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc, false);
if (!err)
- mpd->wbc->nr_to_write--;
- mpd->first_page++;
+ mpd->wbc->nr_to_write -= hpage_nr_pages(page);
+ mpd->first_page = round_up(mpd->first_page + 1, hpage_nr_pages(page));
return err;
}
@@ -2254,12 +2267,16 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
+ unsigned long diff;
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
break;
/* Up to 'end' pages must be contiguous */
- BUG_ON(page->index != start);
+ BUG_ON(page_to_pgoff(page) != start);
+ diff = (page - compound_head(page)) << bpp_bits;
bh = head = page_buffers(page);
+ while (diff--)
+ bh = bh->b_this_page;
do {
if (lblk < mpd->map.m_lblk)
continue;
@@ -2296,7 +2313,10 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
* supports blocksize < pagesize as we will try to
* convert potentially unmapped parts of inode.
*/
- mpd->io_submit.io_end->size += PAGE_SIZE;
+ if (PageTransCompound(page))
+ mpd->io_submit.io_end->size += HPAGE_PMD_SIZE;
+ else
+ mpd->io_submit.io_end->size += PAGE_SIZE;
/* Page fully mapped - let IO run! */
err = mpage_submit_page(mpd, page);
if (err < 0) {
@@ -2304,6 +2324,10 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
return err;
}
start++;
+ if (PageTransCompound(page)) {
+ start = round_up(start, HPAGE_PMD_NR);
+ break;
+ }
}
pagevec_release(&pvec);
}
@@ -2543,7 +2567,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
* mapping. However, page->index will not change
* because we have a reference on the page.
*/
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
goto out;
/*
@@ -2558,7 +2582,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
goto out;
/* If we can't merge this page, we are done. */
- if (mpd->map.m_len > 0 && mpd->next_page != page->index)
+ if (mpd->map.m_len > 0 && mpd->next_page != page_to_pgoff(page))
goto out;
lock_page(page);
@@ -2572,7 +2596,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
if (!PageDirty(page) ||
(PageWriteback(page) &&
(mpd->wbc->sync_mode == WB_SYNC_NONE)) ||
- unlikely(page->mapping != mapping)) {
+ unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
continue;
}
@@ -2581,8 +2605,10 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
BUG_ON(PageWriteback(page));
if (mpd->map.m_len == 0)
- mpd->first_page = page->index;
- mpd->next_page = page->index + 1;
+ mpd->first_page = page_to_pgoff(page);
+ page = compound_head(page);
+ mpd->next_page = round_up(page->index + 1,
+ hpage_nr_pages(page));
/* Add all dirty buffers to mpd */
lblk = ((ext4_lblk_t)page->index) <<
(PAGE_SHIFT - blkbits);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 37/41] ext4: make EXT4_IOC_MOVE_EXT work with huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Adjust how we find relevant block within page and how we clear the
required part of the page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/move_extent.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index a920c5d29fac..f3efdd0e0eaf 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -210,7 +210,9 @@ mext_page_mkuptodate(struct page *page, unsigned from, unsigned to)
return err;
}
if (!buffer_mapped(bh)) {
- zero_user(page, block_start, blocksize);
+ zero_user(page + block_start / PAGE_SIZE,
+ block_start % PAGE_SIZE,
+ blocksize);
set_buffer_uptodate(bh);
continue;
}
@@ -267,10 +269,11 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
unsigned int tmp_data_size, data_size, replaced_size;
int i, err2, jblocks, retries = 0;
int replaced_count = 0;
- int from = data_offset_in_page << orig_inode->i_blkbits;
+ int from;
int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits;
struct super_block *sb = orig_inode->i_sb;
struct buffer_head *bh = NULL;
+ int diff;
/*
* It needs twice the amount of ordinary journal buffers because
@@ -355,6 +358,9 @@ again:
goto unlock_pages;
}
data_copy:
+ diff = (pagep[0] - compound_head(pagep[0])) * blocks_per_page;
+ from = (data_offset_in_page + diff) << orig_inode->i_blkbits;
+ pagep[0] = compound_head(pagep[0]);
*err = mext_page_mkuptodate(pagep[0], from, from + replaced_size);
if (*err)
goto unlock_pages;
@@ -384,7 +390,7 @@ data_copy:
if (!page_has_buffers(pagep[0]))
create_empty_buffers(pagep[0], 1 << orig_inode->i_blkbits, 0);
bh = page_buffers(pagep[0]);
- for (i = 0; i < data_offset_in_page; i++)
+ for (i = 0; i < data_offset_in_page + diff; i++)
bh = bh->b_this_page;
for (i = 0; i < block_len_in_page; i++) {
*err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 37/41] ext4: make EXT4_IOC_MOVE_EXT work with huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
Adjust how we find relevant block within page and how we clear the
required part of the page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/move_extent.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index a920c5d29fac..f3efdd0e0eaf 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -210,7 +210,9 @@ mext_page_mkuptodate(struct page *page, unsigned from, unsigned to)
return err;
}
if (!buffer_mapped(bh)) {
- zero_user(page, block_start, blocksize);
+ zero_user(page + block_start / PAGE_SIZE,
+ block_start % PAGE_SIZE,
+ blocksize);
set_buffer_uptodate(bh);
continue;
}
@@ -267,10 +269,11 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
unsigned int tmp_data_size, data_size, replaced_size;
int i, err2, jblocks, retries = 0;
int replaced_count = 0;
- int from = data_offset_in_page << orig_inode->i_blkbits;
+ int from;
int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits;
struct super_block *sb = orig_inode->i_sb;
struct buffer_head *bh = NULL;
+ int diff;
/*
* It needs twice the amount of ordinary journal buffers because
@@ -355,6 +358,9 @@ again:
goto unlock_pages;
}
data_copy:
+ diff = (pagep[0] - compound_head(pagep[0])) * blocks_per_page;
+ from = (data_offset_in_page + diff) << orig_inode->i_blkbits;
+ pagep[0] = compound_head(pagep[0]);
*err = mext_page_mkuptodate(pagep[0], from, from + replaced_size);
if (*err)
goto unlock_pages;
@@ -384,7 +390,7 @@ data_copy:
if (!page_has_buffers(pagep[0]))
create_empty_buffers(pagep[0], 1 << orig_inode->i_blkbits, 0);
bh = page_buffers(pagep[0]);
- for (i = 0; i < data_offset_in_page; i++)
+ for (i = 0; i < data_offset_in_page + diff; i++)
bh = bh->b_this_page;
for (i = 0; i < block_len_in_page; i++) {
*err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0);
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 38/41] ext4: fix SEEK_DATA/SEEK_HOLE for huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
ext4_find_unwritten_pgoff() needs few tweaks to work with huge pages.
Mostly trivial page_mapping()/page_to_pgoff() and adjustment to how we
find relevant block.
Signe-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/file.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 261ac3734c58..2c3d6bb0edfe 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -473,7 +473,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
* range, it will be a hole.
*/
if (lastoff < endoff && whence == SEEK_HOLE &&
- page->index > end) {
+ page_to_pgoff(page) > end) {
found = 1;
*offset = lastoff;
goto out;
@@ -481,7 +481,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
lock_page(page);
- if (unlikely(page->mapping != inode->i_mapping)) {
+ if (unlikely(page_mapping(page) != inode->i_mapping)) {
unlock_page(page);
continue;
}
@@ -492,8 +492,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
}
if (page_has_buffers(page)) {
+ int diff;
lastoff = page_offset(page);
bh = head = page_buffers(page);
+ diff = (page - compound_head(page)) << inode->i_blkbits;
+ while (diff--)
+ bh = bh->b_this_page;
do {
if (buffer_uptodate(bh) ||
buffer_unwritten(bh)) {
@@ -514,8 +518,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
} while (bh != head);
}
- lastoff = page_offset(page) + PAGE_SIZE;
+ lastoff = page_offset(page) + hpage_size(page);
unlock_page(page);
+ if (PageTransCompound(page)) {
+ i++;
+ break;
+ }
}
/*
@@ -528,7 +536,9 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
break;
}
- index = pvec.pages[i - 1]->index + 1;
+ index = page_to_pgoff(pvec.pages[i - 1]) + 1;
+ if (PageTransCompound(pvec.pages[i - 1]))
+ index = round_up(index, HPAGE_PMD_NR);
pagevec_release(&pvec);
} while (index <= end);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 38/41] ext4: fix SEEK_DATA/SEEK_HOLE for huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
ext4_find_unwritten_pgoff() needs few tweaks to work with huge pages.
Mostly trivial page_mapping()/page_to_pgoff() and adjustment to how we
find relevant block.
Signe-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/file.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 261ac3734c58..2c3d6bb0edfe 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -473,7 +473,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
* range, it will be a hole.
*/
if (lastoff < endoff && whence == SEEK_HOLE &&
- page->index > end) {
+ page_to_pgoff(page) > end) {
found = 1;
*offset = lastoff;
goto out;
@@ -481,7 +481,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
lock_page(page);
- if (unlikely(page->mapping != inode->i_mapping)) {
+ if (unlikely(page_mapping(page) != inode->i_mapping)) {
unlock_page(page);
continue;
}
@@ -492,8 +492,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
}
if (page_has_buffers(page)) {
+ int diff;
lastoff = page_offset(page);
bh = head = page_buffers(page);
+ diff = (page - compound_head(page)) << inode->i_blkbits;
+ while (diff--)
+ bh = bh->b_this_page;
do {
if (buffer_uptodate(bh) ||
buffer_unwritten(bh)) {
@@ -514,8 +518,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
} while (bh != head);
}
- lastoff = page_offset(page) + PAGE_SIZE;
+ lastoff = page_offset(page) + hpage_size(page);
unlock_page(page);
+ if (PageTransCompound(page)) {
+ i++;
+ break;
+ }
}
/*
@@ -528,7 +536,9 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
break;
}
- index = pvec.pages[i - 1]->index + 1;
+ index = page_to_pgoff(pvec.pages[i - 1]) + 1;
+ if (PageTransCompound(pvec.pages[i - 1]))
+ index = round_up(index, HPAGE_PMD_NR);
pagevec_release(&pvec);
} while (index <= end);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 39/41] ext4: make fallocate() operations work with huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
__ext4_block_zero_page_range() adjusted to calculate starting iblock
correctry for huge pages.
ext4_{collapse,insert}_range() requires page cache invalidation. We need
the invalidation to be aligning to huge page border if huge pages are
possible in page cache.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/extents.c | 10 ++++++++--
fs/ext4/inode.c | 3 +--
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d7ccb7f51dfc..d46aeda70fb0 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5525,7 +5525,10 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
* Need to round down offset to be aligned with page size boundary
* for page size > block size.
*/
- ioffset = round_down(offset, PAGE_SIZE);
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ ioffset = round_down(offset, HPAGE_PMD_SIZE);
+ else
+ ioffset = round_down(offset, PAGE_SIZE);
/*
* Write tail of the last page before removed range since it will get
* removed from the page cache below.
@@ -5674,7 +5677,10 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
* Need to round down to align start offset to page size boundary
* for page size > block size.
*/
- ioffset = round_down(offset, PAGE_SIZE);
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ ioffset = round_down(offset, HPAGE_PMD_SIZE);
+ else
+ ioffset = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
LLONG_MAX);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0a3aee4a57f7..cd8d03559896 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3712,7 +3712,6 @@ void ext4_set_aops(struct inode *inode)
static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
- ext4_fsblk_t index = from >> PAGE_SHIFT;
unsigned offset;
unsigned blocksize, pos;
ext4_lblk_t iblock;
@@ -3731,7 +3730,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
blocksize = inode->i_sb->s_blocksize;
- iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
+ iblock = page->index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 39/41] ext4: make fallocate() operations work with huge pages
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
__ext4_block_zero_page_range() adjusted to calculate starting iblock
correctry for huge pages.
ext4_{collapse,insert}_range() requires page cache invalidation. We need
the invalidation to be aligning to huge page border if huge pages are
possible in page cache.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/extents.c | 10 ++++++++--
fs/ext4/inode.c | 3 +--
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d7ccb7f51dfc..d46aeda70fb0 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5525,7 +5525,10 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
* Need to round down offset to be aligned with page size boundary
* for page size > block size.
*/
- ioffset = round_down(offset, PAGE_SIZE);
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ ioffset = round_down(offset, HPAGE_PMD_SIZE);
+ else
+ ioffset = round_down(offset, PAGE_SIZE);
/*
* Write tail of the last page before removed range since it will get
* removed from the page cache below.
@@ -5674,7 +5677,10 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
* Need to round down to align start offset to page size boundary
* for page size > block size.
*/
- ioffset = round_down(offset, PAGE_SIZE);
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+ ioffset = round_down(offset, HPAGE_PMD_SIZE);
+ else
+ ioffset = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
LLONG_MAX);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0a3aee4a57f7..cd8d03559896 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3712,7 +3712,6 @@ void ext4_set_aops(struct inode *inode)
static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
- ext4_fsblk_t index = from >> PAGE_SHIFT;
unsigned offset;
unsigned blocksize, pos;
ext4_lblk_t iblock;
@@ -3731,7 +3730,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
blocksize = inode->i_sb->s_blocksize;
- iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
+ iblock = page->index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
--
2.8.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 40/41] mm, fs, ext4: expand use of page_mapping() and page_to_pgoff()
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
With huge pages in page cache we see tail pages in more code paths.
This patch replaces direct access to struct page fields with macros
which can handle tail pages properly.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 2 +-
fs/ext4/inode.c | 4 ++--
mm/filemap.c | 26 ++++++++++++++------------
mm/memory.c | 4 ++--
mm/page-writeback.c | 2 +-
mm/truncate.c | 5 +++--
6 files changed, 23 insertions(+), 20 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 20898b051044..56323862dad3 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -630,7 +630,7 @@ static void __set_page_dirty(struct page *page, struct address_space *mapping,
unsigned long flags;
spin_lock_irqsave(&mapping->tree_lock, flags);
- if (page->mapping) { /* Race with truncate? */
+ if (page_mapping(page)) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cd8d03559896..e9bfffbf22ed 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1223,7 +1223,7 @@ retry_journal:
}
lock_page(page);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
/* The page got truncated from under us */
unlock_page(page);
put_page(page);
@@ -2962,7 +2962,7 @@ retry_journal:
}
lock_page(page);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
/* The page got truncated from under us */
unlock_page(page);
put_page(page);
diff --git a/mm/filemap.c b/mm/filemap.c
index 71c0bfdcab05..1514192086c3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -369,7 +369,7 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
struct page *page = pvec.pages[i];
/* until radix tree lookup accepts end_index */
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
continue;
page = compound_head(page);
@@ -1307,12 +1307,12 @@ repeat:
}
/* Has the page been truncated? */
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
put_page(page);
goto repeat;
}
- VM_BUG_ON_PAGE(page->index != offset, page);
+ VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
}
if (page && (fgp_flags & FGP_ACCESSED))
@@ -1606,7 +1606,8 @@ repeat:
* otherwise we can get both false positives and false
* negatives, which is just confusing to the caller.
*/
- if (page->mapping == NULL || page_to_pgoff(page) != index) {
+ if (page_mapping(page) == NULL ||
+ page_to_pgoff(page) != index) {
put_page(page);
break;
}
@@ -1907,7 +1908,7 @@ find_page:
if (!trylock_page(page))
goto page_not_up_to_date;
/* Did it get truncated before we got the lock? */
- if (!page->mapping)
+ if (page_mapping(page))
goto page_not_up_to_date_locked;
if (!mapping->a_ops->is_partially_uptodate(page,
offset, iter->count))
@@ -1987,7 +1988,7 @@ page_not_up_to_date:
page_not_up_to_date_locked:
/* Did it get truncated before we got the lock? */
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
put_page(page);
continue;
@@ -2023,7 +2024,7 @@ readpage:
if (unlikely(error))
goto readpage_error;
if (!PageUptodate(page)) {
- if (page->mapping == NULL) {
+ if (page_mapping(page) == NULL) {
/*
* invalidate_mapping_pages got it
*/
@@ -2324,12 +2325,12 @@ retry_find:
}
/* Did it get truncated? */
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
put_page(page);
goto retry_find;
}
- VM_BUG_ON_PAGE(page->index != offset, page);
+ VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
/*
* We have a locked page in the page cache, now we need to check
@@ -2505,7 +2506,7 @@ int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
lock_page(page);
- if (page->mapping != inode->i_mapping) {
+ if (page_mapping(page) != inode->i_mapping) {
unlock_page(page);
ret = VM_FAULT_NOPAGE;
goto out;
@@ -2654,7 +2655,7 @@ filler:
lock_page(page);
/* Case c or d, restart the operation */
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
put_page(page);
goto repeat;
@@ -3110,12 +3111,13 @@ EXPORT_SYMBOL(generic_file_write_iter);
*/
int try_to_release_page(struct page *page, gfp_t gfp_mask)
{
- struct address_space * const mapping = page->mapping;
+ struct address_space * const mapping = page_mapping(page);
BUG_ON(!PageLocked(page));
if (PageWriteback(page))
return 0;
+ page = compound_head(page);
if (mapping && mapping->a_ops->releasepage)
return mapping->a_ops->releasepage(page, gfp_mask);
return try_to_free_buffers(page);
diff --git a/mm/memory.c b/mm/memory.c
index 5b7f0ce44a27..24d012571d32 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2052,7 +2052,7 @@ static int do_page_mkwrite(struct vm_area_struct *vma, struct page *page,
return ret;
if (unlikely(!(ret & VM_FAULT_LOCKED))) {
lock_page(page);
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
return 0; /* retry */
}
@@ -2100,7 +2100,7 @@ static inline int wp_page_reuse(struct fault_env *fe, pte_t orig_pte,
dirtied = set_page_dirty(page);
VM_BUG_ON_PAGE(PageAnon(page), page);
- mapping = page->mapping;
+ mapping = page_mapping(page);
unlock_page(page);
put_page(page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 6390c9488e29..3bfa158aa784 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2878,7 +2878,7 @@ EXPORT_SYMBOL(mapping_tagged);
*/
void wait_for_stable_page(struct page *page)
{
- if (bdi_cap_stable_pages_required(inode_to_bdi(page->mapping->host)))
+ if (bdi_cap_stable_pages_required(inode_to_bdi(page_mapping(page)->host)))
wait_on_page_writeback(page);
}
EXPORT_SYMBOL_GPL(wait_for_stable_page);
diff --git a/mm/truncate.c b/mm/truncate.c
index 6a445278aaaf..87b47de58b50 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -627,6 +627,7 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
{
unsigned long flags;
+ page = compound_head(page);
if (page->mapping != mapping)
return 0;
@@ -655,7 +656,7 @@ static int do_launder_page(struct address_space *mapping, struct page *page)
{
if (!PageDirty(page))
return 0;
- if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
+ if (page_mapping(page) != mapping || mapping->a_ops->launder_page == NULL)
return 0;
return mapping->a_ops->launder_page(page);
}
@@ -703,7 +704,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
unlock_page(page);
continue;
}
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 40/41] mm, fs, ext4: expand use of page_mapping() and page_to_pgoff()
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
With huge pages in page cache we see tail pages in more code paths.
This patch replaces direct access to struct page fields with macros
which can handle tail pages properly.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/buffer.c | 2 +-
fs/ext4/inode.c | 4 ++--
mm/filemap.c | 26 ++++++++++++++------------
mm/memory.c | 4 ++--
mm/page-writeback.c | 2 +-
mm/truncate.c | 5 +++--
6 files changed, 23 insertions(+), 20 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 20898b051044..56323862dad3 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -630,7 +630,7 @@ static void __set_page_dirty(struct page *page, struct address_space *mapping,
unsigned long flags;
spin_lock_irqsave(&mapping->tree_lock, flags);
- if (page->mapping) { /* Race with truncate? */
+ if (page_mapping(page)) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cd8d03559896..e9bfffbf22ed 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1223,7 +1223,7 @@ retry_journal:
}
lock_page(page);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
/* The page got truncated from under us */
unlock_page(page);
put_page(page);
@@ -2962,7 +2962,7 @@ retry_journal:
}
lock_page(page);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
/* The page got truncated from under us */
unlock_page(page);
put_page(page);
diff --git a/mm/filemap.c b/mm/filemap.c
index 71c0bfdcab05..1514192086c3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -369,7 +369,7 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
struct page *page = pvec.pages[i];
/* until radix tree lookup accepts end_index */
- if (page->index > end)
+ if (page_to_pgoff(page) > end)
continue;
page = compound_head(page);
@@ -1307,12 +1307,12 @@ repeat:
}
/* Has the page been truncated? */
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
put_page(page);
goto repeat;
}
- VM_BUG_ON_PAGE(page->index != offset, page);
+ VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
}
if (page && (fgp_flags & FGP_ACCESSED))
@@ -1606,7 +1606,8 @@ repeat:
* otherwise we can get both false positives and false
* negatives, which is just confusing to the caller.
*/
- if (page->mapping == NULL || page_to_pgoff(page) != index) {
+ if (page_mapping(page) == NULL ||
+ page_to_pgoff(page) != index) {
put_page(page);
break;
}
@@ -1907,7 +1908,7 @@ find_page:
if (!trylock_page(page))
goto page_not_up_to_date;
/* Did it get truncated before we got the lock? */
- if (!page->mapping)
+ if (page_mapping(page))
goto page_not_up_to_date_locked;
if (!mapping->a_ops->is_partially_uptodate(page,
offset, iter->count))
@@ -1987,7 +1988,7 @@ page_not_up_to_date:
page_not_up_to_date_locked:
/* Did it get truncated before we got the lock? */
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
put_page(page);
continue;
@@ -2023,7 +2024,7 @@ readpage:
if (unlikely(error))
goto readpage_error;
if (!PageUptodate(page)) {
- if (page->mapping == NULL) {
+ if (page_mapping(page) == NULL) {
/*
* invalidate_mapping_pages got it
*/
@@ -2324,12 +2325,12 @@ retry_find:
}
/* Did it get truncated? */
- if (unlikely(page->mapping != mapping)) {
+ if (unlikely(page_mapping(page) != mapping)) {
unlock_page(page);
put_page(page);
goto retry_find;
}
- VM_BUG_ON_PAGE(page->index != offset, page);
+ VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
/*
* We have a locked page in the page cache, now we need to check
@@ -2505,7 +2506,7 @@ int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
lock_page(page);
- if (page->mapping != inode->i_mapping) {
+ if (page_mapping(page) != inode->i_mapping) {
unlock_page(page);
ret = VM_FAULT_NOPAGE;
goto out;
@@ -2654,7 +2655,7 @@ filler:
lock_page(page);
/* Case c or d, restart the operation */
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
put_page(page);
goto repeat;
@@ -3110,12 +3111,13 @@ EXPORT_SYMBOL(generic_file_write_iter);
*/
int try_to_release_page(struct page *page, gfp_t gfp_mask)
{
- struct address_space * const mapping = page->mapping;
+ struct address_space * const mapping = page_mapping(page);
BUG_ON(!PageLocked(page));
if (PageWriteback(page))
return 0;
+ page = compound_head(page);
if (mapping && mapping->a_ops->releasepage)
return mapping->a_ops->releasepage(page, gfp_mask);
return try_to_free_buffers(page);
diff --git a/mm/memory.c b/mm/memory.c
index 5b7f0ce44a27..24d012571d32 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2052,7 +2052,7 @@ static int do_page_mkwrite(struct vm_area_struct *vma, struct page *page,
return ret;
if (unlikely(!(ret & VM_FAULT_LOCKED))) {
lock_page(page);
- if (!page->mapping) {
+ if (!page_mapping(page)) {
unlock_page(page);
return 0; /* retry */
}
@@ -2100,7 +2100,7 @@ static inline int wp_page_reuse(struct fault_env *fe, pte_t orig_pte,
dirtied = set_page_dirty(page);
VM_BUG_ON_PAGE(PageAnon(page), page);
- mapping = page->mapping;
+ mapping = page_mapping(page);
unlock_page(page);
put_page(page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 6390c9488e29..3bfa158aa784 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2878,7 +2878,7 @@ EXPORT_SYMBOL(mapping_tagged);
*/
void wait_for_stable_page(struct page *page)
{
- if (bdi_cap_stable_pages_required(inode_to_bdi(page->mapping->host)))
+ if (bdi_cap_stable_pages_required(inode_to_bdi(page_mapping(page)->host)))
wait_on_page_writeback(page);
}
EXPORT_SYMBOL_GPL(wait_for_stable_page);
diff --git a/mm/truncate.c b/mm/truncate.c
index 6a445278aaaf..87b47de58b50 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -627,6 +627,7 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
{
unsigned long flags;
+ page = compound_head(page);
if (page->mapping != mapping)
return 0;
@@ -655,7 +656,7 @@ static int do_launder_page(struct address_space *mapping, struct page *page)
{
if (!PageDirty(page))
return 0;
- if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
+ if (page_mapping(page) != mapping || mapping->a_ops->launder_page == NULL)
return 0;
return mapping->a_ops->launder_page(page);
}
@@ -703,7 +704,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
- if (page->mapping != mapping) {
+ if (page_mapping(page) != mapping) {
unlock_page(page);
continue;
}
--
2.8.1
--
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the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 41/41] ext4, vfs: add huge= mount option
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 18:38 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
The same four values as in tmpfs case.
Encyption code is not yet ready to handle huge page, so we disable huge
pages support if the inode has EXT4_INODE_ENCRYPT.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/ext4.h | 5 +++++
fs/ext4/inode.c | 26 +++++++++++++++++++++-----
fs/ext4/super.c | 26 ++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ea31931386ec..feece2d1f646 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1123,6 +1123,11 @@ struct ext4_inode_info {
#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
+#define EXT4_MOUNT_HUGE_MODE 0x6000000 /* Huge support mode: */
+#define EXT4_MOUNT_HUGE_NEVER 0x0000000
+#define EXT4_MOUNT_HUGE_ALWAYS 0x2000000
+#define EXT4_MOUNT_HUGE_WITHIN_SIZE 0x4000000
+#define EXT4_MOUNT_HUGE_ADVISE 0x6000000
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e9bfffbf22ed..828b882521ca 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4370,7 +4370,7 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
void ext4_set_inode_flags(struct inode *inode)
{
unsigned int flags = EXT4_I(inode)->i_flags;
- unsigned int new_fl = 0;
+ unsigned int mask, new_fl = 0;
if (flags & EXT4_SYNC_FL)
new_fl |= S_SYNC;
@@ -4382,10 +4382,26 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_NOATIME;
if (flags & EXT4_DIRSYNC_FL)
new_fl |= S_DIRSYNC;
- if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode))
- new_fl |= S_DAX;
- inode_set_flags(inode, new_fl,
- S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
+ if (S_ISREG(inode->i_mode) && !ext4_encrypted_inode(inode)) {
+ if (test_opt(inode->i_sb, DAX))
+ new_fl |= S_DAX;
+ switch (test_opt(inode->i_sb, HUGE_MODE)) {
+ case EXT4_MOUNT_HUGE_NEVER:
+ break;
+ case EXT4_MOUNT_HUGE_ALWAYS:
+ new_fl |= S_HUGE_ALWAYS;
+ break;
+ case EXT4_MOUNT_HUGE_WITHIN_SIZE:
+ new_fl |= S_HUGE_WITHIN_SIZE;
+ break;
+ case EXT4_MOUNT_HUGE_ADVISE:
+ new_fl |= S_HUGE_ADVISE;
+ break;
+ }
+ }
+ mask = S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
+ S_DIRSYNC | S_DAX | S_HUGE_MODE;
+ inode_set_flags(inode, new_fl, mask);
}
/* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1c593aa0218e..7140e28f95ec 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1123,6 +1123,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
ext4_clear_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA);
+ ext4_set_inode_flags(inode);
}
return res;
}
@@ -1137,6 +1138,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
len, 0);
if (!res) {
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
+ ext4_set_inode_flags(inode);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
@@ -1275,6 +1277,7 @@ enum {
Opt_dioread_nolock, Opt_dioread_lock,
Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Opt_max_dir_size_kb, Opt_nojournal_checksum,
+ Opt_huge_never, Opt_huge_always, Opt_huge_within_size, Opt_huge_advise,
};
static const match_table_t tokens = {
@@ -1354,6 +1357,10 @@ static const match_table_t tokens = {
{Opt_init_itable, "init_itable"},
{Opt_noinit_itable, "noinit_itable"},
{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
+ {Opt_huge_never, "huge=never"},
+ {Opt_huge_always, "huge=always"},
+ {Opt_huge_within_size, "huge=within_size"},
+ {Opt_huge_advise, "huge=advise"},
{Opt_test_dummy_encryption, "test_dummy_encryption"},
{Opt_removed, "check=none"}, /* mount option from ext2/3 */
{Opt_removed, "nocheck"}, /* mount option from ext2/3 */
@@ -1472,6 +1479,11 @@ static int clear_qf_name(struct super_block *sb, int qtype)
#define MOPT_NO_EXT3 0x0200
#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
#define MOPT_STRING 0x0400
+#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
+#define MOPT_HUGE 0x1000
+#else
+#define MOPT_HUGE MOPT_NOSUPPORT
+#endif
static const struct mount_opts {
int token;
@@ -1556,6 +1568,10 @@ static const struct mount_opts {
{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
{Opt_max_dir_size_kb, 0, MOPT_GTE0},
+ {Opt_huge_never, EXT4_MOUNT_HUGE_NEVER, MOPT_HUGE},
+ {Opt_huge_always, EXT4_MOUNT_HUGE_ALWAYS, MOPT_HUGE},
+ {Opt_huge_within_size, EXT4_MOUNT_HUGE_WITHIN_SIZE, MOPT_HUGE},
+ {Opt_huge_advise, EXT4_MOUNT_HUGE_ADVISE, MOPT_HUGE},
{Opt_test_dummy_encryption, 0, MOPT_GTE0},
{Opt_err, 0, 0}
};
@@ -1637,6 +1653,16 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
} else
return -1;
}
+ if (MOPT_HUGE != MOPT_NOSUPPORT && m->flags & MOPT_HUGE) {
+ sbi->s_mount_opt &= ~EXT4_MOUNT_HUGE_MODE;
+ sbi->s_mount_opt |= m->mount_opt;
+ if (m->mount_opt) {
+ ext4_msg(sb, KERN_WARNING, "Warning: "
+ "Support of huge pages is EXPERIMENTAL,"
+ " use at your own risk");
+ }
+ return 1;
+ }
if (m->flags & MOPT_CLEAR_ERR)
clear_opt(sb, ERRORS_MASK);
if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
--
2.8.1
^ permalink raw reply related [flat|nested] 92+ messages in thread
* [PATCHv2 41/41] ext4, vfs: add huge= mount option
@ 2016-08-12 18:38 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 18:38 UTC (permalink / raw)
To: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton
Cc: Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block,
Kirill A. Shutemov
The same four values as in tmpfs case.
Encyption code is not yet ready to handle huge page, so we disable huge
pages support if the inode has EXT4_INODE_ENCRYPT.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ext4/ext4.h | 5 +++++
fs/ext4/inode.c | 26 +++++++++++++++++++++-----
fs/ext4/super.c | 26 ++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ea31931386ec..feece2d1f646 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1123,6 +1123,11 @@ struct ext4_inode_info {
#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
+#define EXT4_MOUNT_HUGE_MODE 0x6000000 /* Huge support mode: */
+#define EXT4_MOUNT_HUGE_NEVER 0x0000000
+#define EXT4_MOUNT_HUGE_ALWAYS 0x2000000
+#define EXT4_MOUNT_HUGE_WITHIN_SIZE 0x4000000
+#define EXT4_MOUNT_HUGE_ADVISE 0x6000000
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e9bfffbf22ed..828b882521ca 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4370,7 +4370,7 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
void ext4_set_inode_flags(struct inode *inode)
{
unsigned int flags = EXT4_I(inode)->i_flags;
- unsigned int new_fl = 0;
+ unsigned int mask, new_fl = 0;
if (flags & EXT4_SYNC_FL)
new_fl |= S_SYNC;
@@ -4382,10 +4382,26 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_NOATIME;
if (flags & EXT4_DIRSYNC_FL)
new_fl |= S_DIRSYNC;
- if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode))
- new_fl |= S_DAX;
- inode_set_flags(inode, new_fl,
- S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
+ if (S_ISREG(inode->i_mode) && !ext4_encrypted_inode(inode)) {
+ if (test_opt(inode->i_sb, DAX))
+ new_fl |= S_DAX;
+ switch (test_opt(inode->i_sb, HUGE_MODE)) {
+ case EXT4_MOUNT_HUGE_NEVER:
+ break;
+ case EXT4_MOUNT_HUGE_ALWAYS:
+ new_fl |= S_HUGE_ALWAYS;
+ break;
+ case EXT4_MOUNT_HUGE_WITHIN_SIZE:
+ new_fl |= S_HUGE_WITHIN_SIZE;
+ break;
+ case EXT4_MOUNT_HUGE_ADVISE:
+ new_fl |= S_HUGE_ADVISE;
+ break;
+ }
+ }
+ mask = S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
+ S_DIRSYNC | S_DAX | S_HUGE_MODE;
+ inode_set_flags(inode, new_fl, mask);
}
/* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1c593aa0218e..7140e28f95ec 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1123,6 +1123,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
ext4_clear_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA);
+ ext4_set_inode_flags(inode);
}
return res;
}
@@ -1137,6 +1138,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
len, 0);
if (!res) {
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
+ ext4_set_inode_flags(inode);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
@@ -1275,6 +1277,7 @@ enum {
Opt_dioread_nolock, Opt_dioread_lock,
Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Opt_max_dir_size_kb, Opt_nojournal_checksum,
+ Opt_huge_never, Opt_huge_always, Opt_huge_within_size, Opt_huge_advise,
};
static const match_table_t tokens = {
@@ -1354,6 +1357,10 @@ static const match_table_t tokens = {
{Opt_init_itable, "init_itable"},
{Opt_noinit_itable, "noinit_itable"},
{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
+ {Opt_huge_never, "huge=never"},
+ {Opt_huge_always, "huge=always"},
+ {Opt_huge_within_size, "huge=within_size"},
+ {Opt_huge_advise, "huge=advise"},
{Opt_test_dummy_encryption, "test_dummy_encryption"},
{Opt_removed, "check=none"}, /* mount option from ext2/3 */
{Opt_removed, "nocheck"}, /* mount option from ext2/3 */
@@ -1472,6 +1479,11 @@ static int clear_qf_name(struct super_block *sb, int qtype)
#define MOPT_NO_EXT3 0x0200
#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
#define MOPT_STRING 0x0400
+#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
+#define MOPT_HUGE 0x1000
+#else
+#define MOPT_HUGE MOPT_NOSUPPORT
+#endif
static const struct mount_opts {
int token;
@@ -1556,6 +1568,10 @@ static const struct mount_opts {
{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
{Opt_max_dir_size_kb, 0, MOPT_GTE0},
+ {Opt_huge_never, EXT4_MOUNT_HUGE_NEVER, MOPT_HUGE},
+ {Opt_huge_always, EXT4_MOUNT_HUGE_ALWAYS, MOPT_HUGE},
+ {Opt_huge_within_size, EXT4_MOUNT_HUGE_WITHIN_SIZE, MOPT_HUGE},
+ {Opt_huge_advise, EXT4_MOUNT_HUGE_ADVISE, MOPT_HUGE},
{Opt_test_dummy_encryption, 0, MOPT_GTE0},
{Opt_err, 0, 0}
};
@@ -1637,6 +1653,16 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
} else
return -1;
}
+ if (MOPT_HUGE != MOPT_NOSUPPORT && m->flags & MOPT_HUGE) {
+ sbi->s_mount_opt &= ~EXT4_MOUNT_HUGE_MODE;
+ sbi->s_mount_opt |= m->mount_opt;
+ if (m->mount_opt) {
+ ext4_msg(sb, KERN_WARNING, "Warning: "
+ "Support of huge pages is EXPERIMENTAL,"
+ " use at your own risk");
+ }
+ return 1;
+ }
if (m->flags & MOPT_CLEAR_ERR)
clear_opt(sb, ERRORS_MASK);
if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
--
2.8.1
--
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^ permalink raw reply related [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
@ 2016-08-12 20:34 ` Theodore Ts'o
-1 siblings, 0 replies; 92+ messages in thread
From: Theodore Ts'o @ 2016-08-12 20:34 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Andreas Dilger, Jan Kara, Andrew Morton, Alexander Viro,
Hugh Dickins, Andrea Arcangeli, Dave Hansen, Vlastimil Babka,
Matthew Wilcox, Ross Zwisler, linux-ext4, linux-fsdevel,
linux-kernel, linux-mm, linux-block
On Fri, Aug 12, 2016 at 09:37:43PM +0300, Kirill A. Shutemov wrote:
> Here's stabilized version of my patchset which intended to bring huge pages
> to ext4.
So this patch is more about mm level changes than it is about the file
system, and I didn't see any comments from the linux-mm peanut gallery
(unless the linux-ext4 list got removed from the cc list, or some such).
I haven't had time to take a close look at the ext4 changes, and I'll
try to carve out some time to do that --- but has anyone from the mm
side of the world taken a look at these patches?
Thanks,
- Ted
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-12 20:34 ` Theodore Ts'o
0 siblings, 0 replies; 92+ messages in thread
From: Theodore Ts'o @ 2016-08-12 20:34 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Andreas Dilger, Jan Kara, Andrew Morton, Alexander Viro,
Hugh Dickins, Andrea Arcangeli, Dave Hansen, Vlastimil Babka,
Matthew Wilcox, Ross Zwisler, linux-ext4, linux-fsdevel,
linux-kernel, linux-mm, linux-block
On Fri, Aug 12, 2016 at 09:37:43PM +0300, Kirill A. Shutemov wrote:
> Here's stabilized version of my patchset which intended to bring huge pages
> to ext4.
So this patch is more about mm level changes than it is about the file
system, and I didn't see any comments from the linux-mm peanut gallery
(unless the linux-ext4 list got removed from the cc list, or some such).
I haven't had time to take a close look at the ext4 changes, and I'll
try to carve out some time to do that --- but has anyone from the mm
side of the world taken a look at these patches?
Thanks,
- Ted
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
2016-08-12 20:34 ` Theodore Ts'o
@ 2016-08-12 23:19 ` Kirill A. Shutemov
-1 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 23:19 UTC (permalink / raw)
To: Theodore Ts'o, Kirill A. Shutemov, Andreas Dilger, Jan Kara,
Andrew Morton, Alexander Viro, Hugh Dickins, Andrea Arcangeli,
Dave Hansen, Vlastimil Babka, Matthew Wilcox, Ross Zwisler,
linux-ext4, linux-fsdevel, linux-kernel, linux-mm, linux-block
On Fri, Aug 12, 2016 at 04:34:40PM -0400, Theodore Ts'o wrote:
> On Fri, Aug 12, 2016 at 09:37:43PM +0300, Kirill A. Shutemov wrote:
> > Here's stabilized version of my patchset which intended to bring huge pages
> > to ext4.
>
> So this patch is more about mm level changes than it is about the file
> system, and I didn't see any comments from the linux-mm peanut gallery
> (unless the linux-ext4 list got removed from the cc list, or some such).
>
> I haven't had time to take a close look at the ext4 changes, and I'll
> try to carve out some time to do that
I would appreciate it.
> --- but has anyone from the mm
> side of the world taken a look at these patches?
Not yet. I had hard time obtaining review on similar-sized patchsets
before :-/
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-12 23:19 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-12 23:19 UTC (permalink / raw)
To: Theodore Ts'o, Kirill A. Shutemov, Andreas Dilger, Jan Kara,
Andrew Morton, Alexander Viro, Hugh Dickins, Andrea Arcangeli,
Dave Hansen, Vlastimil Babka, Matthew Wilcox, Ross Zwisler,
linux-ext4, linux-fsdevel, linux-kernel, linux-mm, linux-block
On Fri, Aug 12, 2016 at 04:34:40PM -0400, Theodore Ts'o wrote:
> On Fri, Aug 12, 2016 at 09:37:43PM +0300, Kirill A. Shutemov wrote:
> > Here's stabilized version of my patchset which intended to bring huge pages
> > to ext4.
>
> So this patch is more about mm level changes than it is about the file
> system, and I didn't see any comments from the linux-mm peanut gallery
> (unless the linux-ext4 list got removed from the cc list, or some such).
>
> I haven't had time to take a close look at the ext4 changes, and I'll
> try to carve out some time to do that
I would appreciate it.
> --- but has anyone from the mm
> side of the world taken a look at these patches?
Not yet. I had hard time obtaining review on similar-sized patchsets
before :-/
--
Kirill A. Shutemov
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
2016-08-12 18:37 ` Kirill A. Shutemov
` (43 preceding siblings ...)
(?)
@ 2016-08-14 7:20 ` Andreas Dilger
2016-08-14 12:40 ` Kirill A. Shutemov
-1 siblings, 1 reply; 92+ messages in thread
From: Andreas Dilger @ 2016-08-14 7:20 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Theodore Ts'o, Andreas Dilger, Jan Kara, Andrew Morton,
Alexander Viro, Hugh Dickins, Andrea Arcangeli, Dave Hansen,
Vlastimil Babka, Matthew Wilcox, Ross Zwisler, linux-ext4,
linux-fsdevel, linux-kernel, linux-mm, linux-block
[-- Attachment #1: Type: text/plain, Size: 2963 bytes --]
On Aug 12, 2016, at 12:37 PM, Kirill A. Shutemov <kirill.shutemov@linux.intel.com> wrote:
>
> Here's stabilized version of my patchset which intended to bring huge pages
> to ext4.
>
> The basics are the same as with tmpfs[1] which is in Linus' tree now and
> ext4 built on top of it. The main difference is that we need to handle
> read out from and write-back to backing storage.
>
> Head page links buffers for whole huge page. Dirty/writeback tracking
> happens on per-hugepage level.
>
> We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
> not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
> huge pagecache enabled.
>
> On split_huge_page() we need to free buffers before splitting the page.
> Page buffers takes additional pin on the page and can be a vector to mess
> with the page during split. We want to avoid this.
> If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
>
> Readahead doesn't play with huge pages well: 128k max readahead window,
> assumption on page size, PageReadahead() to track hit/miss. I've got it
> to allocate huge pages, but it doesn't provide any readahead as such.
> I don't know how to do this right. It's not clear at this point if we
> really need readahead with huge pages. I guess it's good enough for now.
Typically read-ahead is a loss if you are able to get large allocations on
disk, since you can get at least seek_rate * chunk_size throughput from the
disks even with random IO at that size. With 1MB allocations and 7200 RPM drives this works out to be about 150MB/s, which is close to the throughput
of these drive already.
Cheers, Andreas
> Shadow entries ignored on allocation -- recently evicted page is not
> promoted to active list. Not sure if current workingset logic is adequate
> for huge pages. On eviction, we split the huge page and setup 4k shadow
> entries as usual.
>
> Unlike tmpfs, ext4 makes use of tags in radix-tree. The approach I used
> for tmpfs -- 512 entries in radix-tree per-hugepages -- doesn't work well
> if we want to have coherent view on tags. So the first 8 patches of the
> patchset converts tmpfs to use multi-order entries in radix-tree.
> The same infrastructure used for ext4.
>
> Encryption doesn't handle huge pages yet. To avoid regressions we just
> disable huge pages for the inode if it has EXT4_INODE_ENCRYPT.
>
> With this version I don't see any xfstests regressions with huge pages enabled.
> Patch with new configurations for xfstests-bld is below.
>
> Tested with 4k, 1k, encryption and bigalloc. All with and without
> huge=always. I think it's reasonable coverage.
>
> The patchset is also in git:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v2
>
> Please review and consider applying.
>
> [1] http://lkml.kernel.org/r/1465222029-45942-1-git-send-email-kirill.shutemov@linux.intel.com
[-- Attachment #2: Message signed with OpenPGP using GPGMail --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
2016-08-14 7:20 ` Andreas Dilger
@ 2016-08-14 12:40 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-14 12:40 UTC (permalink / raw)
To: Andreas Dilger
Cc: Kirill A. Shutemov, Theodore Ts'o, Andreas Dilger, Jan Kara,
Andrew Morton, Alexander Viro, Hugh Dickins, Andrea Arcangeli,
Dave Hansen, Vlastimil Babka, Matthew Wilcox, Ross Zwisler,
linux-ext4, linux-fsdevel, linux-kernel, linux-mm, linux-block
On Sun, Aug 14, 2016 at 01:20:12AM -0600, Andreas Dilger wrote:
> On Aug 12, 2016, at 12:37 PM, Kirill A. Shutemov <kirill.shutemov@linux.intel.com> wrote:
> >
> > Here's stabilized version of my patchset which intended to bring huge pages
> > to ext4.
> >
> > The basics are the same as with tmpfs[1] which is in Linus' tree now and
> > ext4 built on top of it. The main difference is that we need to handle
> > read out from and write-back to backing storage.
> >
> > Head page links buffers for whole huge page. Dirty/writeback tracking
> > happens on per-hugepage level.
> >
> > We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
> > not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
> > huge pagecache enabled.
> >
> > On split_huge_page() we need to free buffers before splitting the page.
> > Page buffers takes additional pin on the page and can be a vector to mess
> > with the page during split. We want to avoid this.
> > If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
> >
> > Readahead doesn't play with huge pages well: 128k max readahead window,
> > assumption on page size, PageReadahead() to track hit/miss. I've got it
> > to allocate huge pages, but it doesn't provide any readahead as such.
> > I don't know how to do this right. It's not clear at this point if we
> > really need readahead with huge pages. I guess it's good enough for now.
>
> Typically read-ahead is a loss if you are able to get large allocations on
> disk, since you can get at least seek_rate * chunk_size throughput from the
> disks even with random IO at that size. With 1MB allocations and 7200
> RPM drives this works out to be about 150MB/s, which is close to the
> throughput of these drive already.
I'm more worried about not about throughput, but latancy spikes once we
cross huge page boundaries. We can get cache miss where we had hit with
small pages.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 92+ messages in thread
* Re: [PATCHv2, 00/41] ext4: support of huge pages
@ 2016-08-14 12:40 ` Kirill A. Shutemov
0 siblings, 0 replies; 92+ messages in thread
From: Kirill A. Shutemov @ 2016-08-14 12:40 UTC (permalink / raw)
To: Andreas Dilger
Cc: Kirill A. Shutemov, Theodore Ts'o, Andreas Dilger, Jan Kara,
Andrew Morton, Alexander Viro, Hugh Dickins, Andrea Arcangeli,
Dave Hansen, Vlastimil Babka, Matthew Wilcox, Ross Zwisler,
linux-ext4, linux-fsdevel, linux-kernel, linux-mm, linux-block
On Sun, Aug 14, 2016 at 01:20:12AM -0600, Andreas Dilger wrote:
> On Aug 12, 2016, at 12:37 PM, Kirill A. Shutemov <kirill.shutemov@linux.intel.com> wrote:
> >
> > Here's stabilized version of my patchset which intended to bring huge pages
> > to ext4.
> >
> > The basics are the same as with tmpfs[1] which is in Linus' tree now and
> > ext4 built on top of it. The main difference is that we need to handle
> > read out from and write-back to backing storage.
> >
> > Head page links buffers for whole huge page. Dirty/writeback tracking
> > happens on per-hugepage level.
> >
> > We read out whole huge page at once. It required bumping BIO_MAX_PAGES to
> > not less than HPAGE_PMD_NR. I defined BIO_MAX_PAGES to HPAGE_PMD_NR if
> > huge pagecache enabled.
> >
> > On split_huge_page() we need to free buffers before splitting the page.
> > Page buffers takes additional pin on the page and can be a vector to mess
> > with the page during split. We want to avoid this.
> > If try_to_free_buffers() fails, split_huge_page() would return -EBUSY.
> >
> > Readahead doesn't play with huge pages well: 128k max readahead window,
> > assumption on page size, PageReadahead() to track hit/miss. I've got it
> > to allocate huge pages, but it doesn't provide any readahead as such.
> > I don't know how to do this right. It's not clear at this point if we
> > really need readahead with huge pages. I guess it's good enough for now.
>
> Typically read-ahead is a loss if you are able to get large allocations on
> disk, since you can get at least seek_rate * chunk_size throughput from the
> disks even with random IO at that size. With 1MB allocations and 7200
> RPM drives this works out to be about 150MB/s, which is close to the
> throughput of these drive already.
I'm more worried about not about throughput, but latancy spikes once we
cross huge page boundaries. We can get cache miss where we had hit with
small pages.
--
Kirill A. Shutemov
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply [flat|nested] 92+ messages in thread
end of thread, other threads:[~2016-08-14 12:40 UTC | newest]
Thread overview: 92+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-08-12 18:37 [PATCHv2, 00/41] ext4: support of huge pages Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 01/41] tools: Add WARN_ON_ONCE Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 02/41] radix tree test suite: Allow GFP_ATOMIC allocations to fail Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 03/41] radix-tree: Add radix_tree_join Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 04/41] radix-tree: Add radix_tree_split Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 05/41] radix-tree: Add radix_tree_split_preload() Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 06/41] radix-tree: Handle multiorder entries being deleted by replace_clear_tags Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 07/41] mm, shmem: swich huge tmpfs to multi-order radix-tree entries Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 08/41] Revert "radix-tree: implement radix_tree_maybe_preload_order()" Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 09/41] page-flags: relax page flag policy for few flags Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 10/41] mm, rmap: account file thp pages Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 11/41] thp: try to free page's buffers before attempt split Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 12/41] thp: handle write-protection faults for file THP Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 13/41] truncate: make sure invalidate_mapping_pages() can discard huge pages Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 14/41] filemap: allocate huge page in page_cache_read(), if allowed Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 15/41] filemap: handle huge pages in do_generic_file_read() Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:37 ` [PATCHv2 16/41] filemap: allocate huge page in pagecache_get_page(), if allowed Kirill A. Shutemov
2016-08-12 18:37 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 17/41] filemap: handle huge pages in filemap_fdatawait_range() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 18/41] HACK: readahead: alloc huge pages, if allowed Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 19/41] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 20/41] mm: make write_cache_pages() work on huge pages Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 21/41] thp: introduce hpage_size() and hpage_mask() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 22/41] thp: do not threat slab pages as huge in hpage_{nr_pages,size,mask} Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 23/41] fs: make block_read_full_page() be able to read huge page Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 24/41] fs: make block_write_{begin,end}() be able to handle huge pages Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 25/41] fs: make block_page_mkwrite() aware about " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 26/41] truncate: make truncate_inode_pages_range() " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 27/41] truncate: make invalidate_inode_pages2_range() " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 28/41] mm, hugetlb: switch hugetlbfs to multi-order radix-tree entries Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 29/41] ext4: make ext4_mpage_readpages() hugepage-aware Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 30/41] ext4: make ext4_writepage() work on huge pages Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 31/41] ext4: handle huge pages in ext4_page_mkwrite() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 32/41] ext4: handle huge pages in __ext4_block_zero_page_range() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 33/41] ext4: make ext4_block_write_begin() aware about huge pages Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 34/41] ext4: handle huge pages in ext4_da_write_end() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 35/41] ext4: make ext4_da_page_release_reservation() aware about huge pages Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 36/41] ext4: handle writeback with " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 37/41] ext4: make EXT4_IOC_MOVE_EXT work " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 38/41] ext4: fix SEEK_DATA/SEEK_HOLE for " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 39/41] ext4: make fallocate() operations work with " Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 40/41] mm, fs, ext4: expand use of page_mapping() and page_to_pgoff() Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 18:38 ` [PATCHv2 41/41] ext4, vfs: add huge= mount option Kirill A. Shutemov
2016-08-12 18:38 ` Kirill A. Shutemov
2016-08-12 20:34 ` [PATCHv2, 00/41] ext4: support of huge pages Theodore Ts'o
2016-08-12 20:34 ` Theodore Ts'o
2016-08-12 23:19 ` Kirill A. Shutemov
2016-08-12 23:19 ` Kirill A. Shutemov
2016-08-14 7:20 ` Andreas Dilger
2016-08-14 12:40 ` Kirill A. Shutemov
2016-08-14 12:40 ` Kirill A. Shutemov
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