From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, darrick.wong@oracle.com,
dchinner@redhat.com, ebiggers@google.com, gaoxiang25@huawei.com,
hch@lst.de, jaegeuk@kernel.org, jhubbard@nvidia.com,
johannes.thumshirn@wdc.com, joseph.qi@linux.alibaba.com,
junxiao.bi@oracle.com, linux-mm@kvack.org, mhocko@suse.com,
mm-commits@vger.kernel.org, mszeredi@redhat.com,
torvalds@linux-foundation.org, william.kucharski@oracle.com,
willy@infradead.org, xiyou.wangcong@gmail.com,
yuchao0@huawei.com, ziy@nvidia.com
Subject: [patch 030/128] btrfs: convert from readpages to readahead
Date: Mon, 01 Jun 2020 21:47:05 -0700 [thread overview]
Message-ID: <20200602044705.AcJ9d8Z8n%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org>
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: btrfs: convert from readpages to readahead
Implement the new readahead method in btrfs using the new
readahead_page_batch() function.
Link: http://lkml.kernel.org/r/20200414150233.24495-18-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Cc: Chao Yu <yuchao0@huawei.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Gao Xiang <gaoxiang25@huawei.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/btrfs/extent_io.c | 43 +++++++++++------------------------------
fs/btrfs/extent_io.h | 3 --
fs/btrfs/inode.c | 16 ++++++---------
3 files changed, 20 insertions(+), 42 deletions(-)
--- a/fs/btrfs/extent_io.c~btrfs-convert-from-readpages-to-readahead
+++ a/fs/btrfs/extent_io.c
@@ -4367,51 +4367,32 @@ int extent_writepages(struct address_spa
return ret;
}
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages)
+void extent_readahead(struct readahead_control *rac)
{
struct bio *bio = NULL;
unsigned long bio_flags = 0;
struct page *pagepool[16];
struct extent_map *em_cached = NULL;
- int nr = 0;
u64 prev_em_start = (u64)-1;
+ int nr;
- while (!list_empty(pages)) {
- u64 contig_end = 0;
+ while ((nr = readahead_page_batch(rac, pagepool))) {
+ u64 contig_start = page_offset(pagepool[0]);
+ u64 contig_end = page_offset(pagepool[nr - 1]) + PAGE_SIZE - 1;
- for (nr = 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) {
- struct page *page = lru_to_page(pages);
+ ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
- prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping, page->index,
- readahead_gfp_mask(mapping))) {
- put_page(page);
- break;
- }
-
- pagepool[nr++] = page;
- contig_end = page_offset(page) + PAGE_SIZE - 1;
- }
-
- if (nr) {
- u64 contig_start = page_offset(pagepool[0]);
-
- ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
-
- contiguous_readpages(pagepool, nr, contig_start,
- contig_end, &em_cached, &bio, &bio_flags,
- &prev_em_start);
- }
+ contiguous_readpages(pagepool, nr, contig_start, contig_end,
+ &em_cached, &bio, &bio_flags, &prev_em_start);
}
if (em_cached)
free_extent_map(em_cached);
- if (bio)
- return submit_one_bio(bio, 0, bio_flags);
- return 0;
+ if (bio) {
+ if (submit_one_bio(bio, 0, bio_flags))
+ return;
+ }
}
/*
--- a/fs/btrfs/extent_io.h~btrfs-convert-from-readpages-to-readahead
+++ a/fs/btrfs/extent_io.h
@@ -198,8 +198,7 @@ int extent_writepages(struct address_spa
struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc);
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages);
+void extent_readahead(struct readahead_control *rac);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
void set_page_extent_mapped(struct page *page);
--- a/fs/btrfs/inode.c~btrfs-convert-from-readpages-to-readahead
+++ a/fs/btrfs/inode.c
@@ -4856,8 +4856,8 @@ static void evict_inode_truncate_pages(s
/*
* Keep looping until we have no more ranges in the io tree.
- * We can have ongoing bios started by readpages (called from readahead)
- * that have their endio callback (extent_io.c:end_bio_extent_readpage)
+ * We can have ongoing bios started by readahead that have
+ * their endio callback (extent_io.c:end_bio_extent_readpage)
* still in progress (unlocked the pages in the bio but did not yet
* unlocked the ranges in the io tree). Therefore this means some
* ranges can still be locked and eviction started because before
@@ -7050,11 +7050,11 @@ static int lock_extent_direct(struct ino
* for it to complete) and then invalidate the pages for
* this range (through invalidate_inode_pages2_range()),
* but that can lead us to a deadlock with a concurrent
- * call to readpages() (a buffered read or a defrag call
+ * call to readahead (a buffered read or a defrag call
* triggered a readahead) on a page lock due to an
* ordered dio extent we created before but did not have
* yet a corresponding bio submitted (whence it can not
- * complete), which makes readpages() wait for that
+ * complete), which makes readahead wait for that
* ordered extent to complete while holding a lock on
* that page.
*/
@@ -8293,11 +8293,9 @@ static int btrfs_writepages(struct addre
return extent_writepages(mapping, wbc);
}
-static int
-btrfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void btrfs_readahead(struct readahead_control *rac)
{
- return extent_readpages(mapping, pages, nr_pages);
+ extent_readahead(rac);
}
static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
@@ -10553,7 +10551,7 @@ static const struct address_space_operat
.readpage = btrfs_readpage,
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
- .readpages = btrfs_readpages,
+ .readahead = btrfs_readahead,
.direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
_
next prev parent reply other threads:[~2020-06-02 4:47 UTC|newest]
Thread overview: 137+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 4:44 incoming Andrew Morton
2020-06-02 4:45 ` [patch 001/128] squashfs: migrate from ll_rw_block usage to BIO Andrew Morton
2020-06-02 4:45 ` [patch 002/128] ocfs2: add missing annotation for dlm_empty_lockres() Andrew Morton
2020-06-02 4:45 ` [patch 003/128] ocfs2: mount shared volume without ha stack Andrew Morton
2020-06-02 4:45 ` [patch 004/128] arch/parisc/include/asm/pgtable.h: remove unused `old_pte' Andrew Morton
2020-06-02 4:45 ` [patch 005/128] vfs: track per-sb writeback errors and report them to syncfs Andrew Morton
2020-06-02 4:45 ` [patch 006/128] fs/buffer.c: record blockdev write errors in super_block that it backs Andrew Morton
2020-06-02 4:45 ` [patch 007/128] usercopy: mark dma-kmalloc caches as usercopy caches Andrew Morton
2020-06-02 4:45 ` [patch 008/128] mm/slub.c: fix corrupted freechain in deactivate_slab() Andrew Morton
2020-06-02 4:45 ` [patch 009/128] slub: Remove userspace notifier for cache add/remove Andrew Morton
2020-06-02 4:45 ` [patch 010/128] slub: remove kmalloc under list_lock from list_slab_objects() V2 Andrew Morton
2020-06-02 4:45 ` [patch 011/128] mm/slub: fix stack overruns with SLUB_STATS Andrew Morton
2020-06-02 4:46 ` [patch 012/128] Documentation/vm/slub.rst: s/Toggle/Enable/ Andrew Morton
2020-06-02 13:10 ` Rafael Aquini
2020-06-02 4:46 ` [patch 013/128] mm, dump_page(): do not crash with invalid mapping pointer Andrew Morton
2020-06-02 4:46 ` [patch 014/128] mm: move readahead prototypes from mm.h Andrew Morton
2020-06-02 4:46 ` [patch 015/128] mm: return void from various readahead functions Andrew Morton
2020-06-02 4:46 ` [patch 016/128] mm: ignore return value of ->readpages Andrew Morton
2020-06-02 4:46 ` [patch 017/128] mm: move readahead nr_pages check into read_pages Andrew Morton
2020-06-02 4:46 ` [patch 018/128] mm: add new readahead_control API Andrew Morton
2020-06-02 4:46 ` [patch 019/128] mm: use readahead_control to pass arguments Andrew Morton
2020-06-02 4:46 ` [patch 020/128] mm: rename various 'offset' parameters to 'index' Andrew Morton
2020-06-02 4:46 ` [patch 021/128] mm: rename readahead loop variable to 'i' Andrew Morton
2020-06-02 4:46 ` [patch 022/128] mm: remove 'page_offset' from readahead loop Andrew Morton
2020-06-02 4:46 ` [patch 023/128] mm: put readahead pages in cache earlier Andrew Morton
2020-06-02 4:46 ` [patch 024/128] mm: add readahead address space operation Andrew Morton
2020-06-02 4:46 ` [patch 025/128] mm: move end_index check out of readahead loop Andrew Morton
2020-06-02 4:46 ` [patch 026/128] mm: add page_cache_readahead_unbounded Andrew Morton
2020-06-02 4:46 ` [patch 027/128] mm: document why we don't set PageReadahead Andrew Morton
2020-06-02 4:46 ` [patch 028/128] mm: use memalloc_nofs_save in readahead path Andrew Morton
2020-06-02 4:47 ` [patch 029/128] fs: convert mpage_readpages to mpage_readahead Andrew Morton
2020-06-02 4:47 ` Andrew Morton [this message]
2020-06-02 4:47 ` [patch 031/128] erofs: convert uncompressed files from readpages to readahead Andrew Morton
2020-06-02 4:47 ` [patch 032/128] erofs: convert compressed " Andrew Morton
2020-06-02 4:47 ` [patch 033/128] ext4: convert " Andrew Morton
2020-06-02 4:47 ` [patch 034/128] ext4: pass the inode to ext4_mpage_readpages Andrew Morton
2020-06-02 4:47 ` [patch 035/128] f2fs: convert from readpages to readahead Andrew Morton
2020-06-02 4:47 ` [patch 036/128] f2fs: pass the inode to f2fs_mpage_readpages Andrew Morton
2020-06-02 4:47 ` [patch 037/128] fuse: convert from readpages to readahead Andrew Morton
2020-06-02 4:47 ` [patch 038/128] iomap: " Andrew Morton
2020-06-02 4:47 ` [patch 039/128] include/linux/pagemap.h: introduce attach/detach_page_private Andrew Morton
2020-06-02 4:47 ` [patch 040/128] md: remove __clear_page_buffers and use attach/detach_page_private Andrew Morton
2020-06-02 4:47 ` [patch 041/128] btrfs: " Andrew Morton
2020-06-02 14:19 ` David Sterba
2020-06-02 4:47 ` [patch 042/128] fs/buffer.c: " Andrew Morton
2020-06-02 4:47 ` [patch 043/128] f2fs: " Andrew Morton
2020-06-02 4:47 ` [patch 044/128] iomap: " Andrew Morton
2020-06-02 16:23 ` Darrick J. Wong
2020-06-02 4:47 ` [patch 045/128] ntfs: replace attach_page_buffers with attach_page_private Andrew Morton
2020-06-02 4:48 ` [patch 046/128] orangefs: use attach/detach_page_private Andrew Morton
2020-06-02 4:48 ` [patch 047/128] buffer_head.h: remove attach_page_buffers Andrew Morton
2020-06-02 4:48 ` [patch 048/128] mm/migrate.c: call detach_page_private to cleanup code Andrew Morton
2020-06-02 4:48 ` [patch 049/128] mm_types.h: change set_page_private to inline function Andrew Morton
2020-06-02 4:48 ` [patch 050/128] mm/filemap.c: remove misleading comment Andrew Morton
2020-06-02 4:48 ` [patch 051/128] mm/page-writeback.c: remove unused variable Andrew Morton
2020-06-02 4:48 ` [patch 052/128] mm/writeback: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE Andrew Morton
2020-06-02 4:48 ` [patch 053/128] mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead Andrew Morton
2020-06-02 4:48 ` [patch 054/128] mm/gup.c: update the documentation Andrew Morton
2020-06-02 4:48 ` [patch 055/128] mm/gup: introduce pin_user_pages_unlocked Andrew Morton
2020-06-02 4:48 ` [patch 056/128] ivtv: convert get_user_pages() --> pin_user_pages() Andrew Morton
2020-06-02 4:48 ` [patch 057/128] mm/gup.c: further document vma_permits_fault() Andrew Morton
2020-06-02 4:48 ` [patch 058/128] mm/swapfile: use list_{prev,next}_entry() instead of open-coding Andrew Morton
2020-06-02 4:48 ` [patch 059/128] mm/swap_state: fix a data race in swapin_nr_pages Andrew Morton
2020-06-02 4:48 ` [patch 060/128] mm: swap: properly update readahead statistics in unuse_pte_range() Andrew Morton
2020-06-02 4:48 ` [patch 061/128] mm/swapfile.c: offset is only used when there is more slots Andrew Morton
2020-06-02 4:48 ` [patch 062/128] mm/swapfile.c: explicitly show ssd/non-ssd is handled mutually exclusive Andrew Morton
2020-06-02 4:48 ` [patch 063/128] mm/swapfile.c: remove the unnecessary goto for SSD case Andrew Morton
2020-06-02 4:48 ` [patch 064/128] mm/swapfile.c: simplify the calculation of n_goal Andrew Morton
2020-06-02 4:48 ` [patch 065/128] mm/swapfile.c: remove the extra check in scan_swap_map_slots() Andrew Morton
2020-06-02 4:49 ` [patch 066/128] mm/swapfile.c: found_free could be represented by (tmp < max) Andrew Morton
2020-06-02 4:49 ` [patch 067/128] mm/swapfile.c: tmp is always smaller than max Andrew Morton
2020-06-02 4:49 ` [patch 068/128] mm/swapfile.c: omit a duplicate code by compare tmp and max first Andrew Morton
2020-06-02 4:49 ` [patch 069/128] swap: try to scan more free slots even when fragmented Andrew Morton
2020-06-02 4:49 ` [patch 070/128] mm/swapfile.c: classify SWAP_MAP_XXX to make it more readable Andrew Morton
2020-06-02 4:49 ` [patch 071/128] mm/swapfile.c: __swap_entry_free() always free 1 entry Andrew Morton
2020-06-02 4:49 ` [patch 072/128] mm/swapfile.c: use prandom_u32_max() Andrew Morton
2020-06-02 4:49 ` [patch 073/128] swap: reduce lock contention on swap cache from swap slots allocation Andrew Morton
2020-06-02 4:49 ` [patch 074/128] mm: swapfile: fix /proc/swaps heading and Size/Used/Priority alignment Andrew Morton
2020-06-02 4:49 ` [patch 075/128] include/linux/swap.h: delete meaningless __add_to_swap_cache() declaration Andrew Morton
2020-06-02 4:49 ` [patch 076/128] mm, memcg: add workingset_restore in memory.stat Andrew Morton
2020-06-02 4:49 ` [patch 077/128] mm: memcontrol: simplify value comparison between count and limit Andrew Morton
2020-06-02 4:49 ` [patch 078/128] memcg: expose root cgroup's memory.stat Andrew Morton
2020-06-02 4:49 ` [patch 079/128] mm/memcg: prepare for swap over-high accounting and penalty calculation Andrew Morton
2020-06-02 4:49 ` [patch 080/128] mm/memcg: move penalty delay clamping out of calculate_high_delay() Andrew Morton
2020-06-02 4:49 ` [patch 081/128] mm/memcg: move cgroup high memory limit setting into struct page_counter Andrew Morton
2020-06-02 4:49 ` [patch 082/128] mm/memcg: automatically penalize tasks with high swap use Andrew Morton
2020-06-02 4:49 ` [patch 083/128] memcg: fix memcg_kmem_bypass() for remote memcg charging Andrew Morton
2020-06-02 4:49 ` [patch 084/128] x86: mm: ptdump: calculate effective permissions correctly Andrew Morton
2020-06-02 4:50 ` [patch 085/128] mm: ptdump: expand type of 'val' in note_page() Andrew Morton
2020-06-02 4:50 ` [patch 086/128] /proc/PID/smaps: Add PMD migration entry parsing Andrew Morton
2020-06-02 4:50 ` [patch 087/128] mm/memory: remove unnecessary pte_devmap case in copy_one_pte() Andrew Morton
2020-06-02 4:50 ` [patch 088/128] mm, memory_failure: don't send BUS_MCEERR_AO for action required error Andrew Morton
2020-06-02 4:50 ` [patch 089/128] x86/hyperv: use vmalloc_exec for the hypercall page Andrew Morton
2020-06-02 4:50 ` [patch 090/128] x86: fix vmap arguments in map_irq_stack Andrew Morton
2020-06-02 4:50 ` [patch 091/128] staging: android: ion: use vmap instead of vm_map_ram Andrew Morton
2020-06-02 4:50 ` [patch 092/128] staging: media: ipu3: use vmap instead of reimplementing it Andrew Morton
2020-06-02 4:50 ` [patch 093/128] dma-mapping: use vmap insted " Andrew Morton
2020-06-02 4:50 ` [patch 094/128] powerpc: add an ioremap_phb helper Andrew Morton
2020-06-02 4:50 ` [patch 095/128] powerpc: remove __ioremap_at and __iounmap_at Andrew Morton
2020-06-02 4:50 ` [patch 096/128] mm: remove __get_vm_area Andrew Morton
2020-06-02 4:50 ` [patch 097/128] mm: unexport unmap_kernel_range_noflush Andrew Morton
2020-06-02 4:50 ` [patch 098/128] mm: rename CONFIG_PGTABLE_MAPPING to CONFIG_ZSMALLOC_PGTABLE_MAPPING Andrew Morton
2020-06-02 4:50 ` [patch 099/128] mm: only allow page table mappings for built-in zsmalloc Andrew Morton
2020-06-02 4:51 ` [patch 100/128] mm: pass addr as unsigned long to vb_free Andrew Morton
2020-06-02 4:51 ` [patch 101/128] mm: remove vmap_page_range_noflush and vunmap_page_range Andrew Morton
2020-06-02 4:51 ` [patch 102/128] mm: rename vmap_page_range to map_kernel_range Andrew Morton
2020-06-02 4:51 ` [patch 103/128] mm: don't return the number of pages from map_kernel_range{,_noflush} Andrew Morton
2020-06-02 4:51 ` [patch 104/128] mm: remove map_vm_range Andrew Morton
2020-06-02 4:51 ` [patch 105/128] mm: remove unmap_vmap_area Andrew Morton
2020-06-02 4:51 ` [patch 106/128] mm: remove the prot argument from vm_map_ram Andrew Morton
2020-06-02 4:51 ` [patch 107/128] mm: enforce that vmap can't map pages executable Andrew Morton
2020-06-02 4:51 ` [patch 108/128] gpu/drm: remove the powerpc hack in drm_legacy_sg_alloc Andrew Morton
2020-06-02 4:51 ` [patch 109/128] mm: remove the pgprot argument to __vmalloc Andrew Morton
2020-06-02 4:51 ` [patch 110/128] mm: remove the prot argument to __vmalloc_node Andrew Morton
2020-06-02 4:51 ` [patch 111/128] mm: remove both instances of __vmalloc_node_flags Andrew Morton
2020-06-02 4:51 ` [patch 112/128] mm: remove __vmalloc_node_flags_caller Andrew Morton
2020-06-02 4:51 ` [patch 113/128] mm: switch the test_vmalloc module to use __vmalloc_node Andrew Morton
2020-06-02 4:52 ` [patch 114/128] mm: remove vmalloc_user_node_flags Andrew Morton
2020-06-02 4:52 ` [patch 115/128] arm64: use __vmalloc_node in arch_alloc_vmap_stack Andrew Morton
2020-06-02 4:52 ` [patch 116/128] powerpc: use __vmalloc_node in alloc_vm_stack Andrew Morton
2020-06-02 4:52 ` [patch 117/128] s390: use __vmalloc_node in stack_alloc Andrew Morton
2020-06-02 4:52 ` [patch 118/128] mm: add functions to track page directory modifications Andrew Morton
2020-06-02 4:52 ` [patch 119/128] mm/vmalloc: track which page-table levels were modified Andrew Morton
2020-06-02 4:52 ` [patch 120/128] mm/ioremap: " Andrew Morton
2020-06-02 4:52 ` [patch 121/128] x86/mm/64: implement arch_sync_kernel_mappings() Andrew Morton
2020-06-02 4:52 ` [patch 122/128] x86/mm/32: " Andrew Morton
2020-06-02 4:52 ` [patch 123/128] mm: remove vmalloc_sync_(un)mappings() Andrew Morton
2020-06-02 4:52 ` [patch 124/128] x86/mm: remove vmalloc faulting Andrew Morton
2020-06-02 4:52 ` [patch 125/128] kasan: fix clang compilation warning due to stack protector Andrew Morton
2020-06-02 4:52 ` [patch 126/128] ubsan: entirely disable alignment checks under UBSAN_TRAP Andrew Morton
2020-06-02 4:52 ` [patch 127/128] mm/mm_init.c: report kasan-tag information stored in page->flags Andrew Morton
2020-06-02 4:52 ` [patch 128/128] kasan: move kasan_report() into report.c Andrew Morton
2020-06-02 20:08 ` incoming Andrew Morton
2020-06-02 20:45 ` incoming Linus Torvalds
2020-06-02 21:38 ` incoming Andrew Morton
2020-06-02 22:18 ` incoming Linus Torvalds
2020-06-02 20:09 incoming Andrew Morton
2020-06-02 20:11 ` [patch 030/128] btrfs: convert from readpages to readahead Andrew Morton
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