From: Matthew Wilcox <willy@infradead.org>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, Jan Kara <jack@suse.cz>,
Jeff Layton <jlayton@redhat.com>,
Lukas Czerner <lczerner@redhat.com>,
Christoph Hellwig <hch@lst.de>,
Goldwyn Rodrigues <rgoldwyn@suse.com>,
Nicholas Piggin <npiggin@gmail.com>,
Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
linux-nilfs@vger.kernel.org, Jaegeuk Kim <jaegeuk@kernel.org>,
Chao Yu <yuchao0@huawei.com>,
linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [PATCH v14 00/74] Convert page cache to XArray
Date: Tue, 19 Jun 2018 10:16:38 -0700 [thread overview]
Message-ID: <20180619171638.GE1438@bombadil.infradead.org> (raw)
In-Reply-To: <20180619164037.GA6679@linux.intel.com>
On Tue, Jun 19, 2018 at 10:40:37AM -0600, Ross Zwisler wrote:
> On Tue, Jun 19, 2018 at 02:22:30AM -0700, Matthew Wilcox wrote:
> > On Mon, Jun 18, 2018 at 09:12:57PM -0600, Ross Zwisler wrote:
> > > Hit another deadlock. This one reproduces 100% of the time in my setup with
> > > XFS + DAX + generic/340. It doesn't reproduce for me at all with
> > > next-20180615. Here's the output from "echo w > /proc/sysrq-trigger":
> >
> > *sigh*. I wonder what the differences are between our setups ...
> >
> > > [ 92.849119] sysrq: SysRq : Show Blocked State
> > > [ 92.850506] task PC stack pid father
> > > [ 92.852299] holetest D 0 1651 1466 0x00000000
> > > [ 92.853912] Call Trace:
> > > [ 92.854610] __schedule+0x2c5/0xad0
> > > [ 92.855612] schedule+0x36/0x90
> > > [ 92.856602] get_unlocked_entry+0xce/0x120
> > > [ 92.857756] ? dax_insert_entry+0x2b0/0x2b0
> > > [ 92.858931] grab_mapping_entry+0x19e/0x250
> > > [ 92.860119] dax_iomap_pte_fault+0x115/0x1140
> > > [ 92.860836] dax_iomap_fault+0x37/0x40
> > ...
> > > This looks very similar to the one I reported last week with generic/269.
> >
> > Yeah, another missing wakeup, no doubt. Can you bisect this? That was
> > how I found the last one; bisected it to a single patch and stared very
> > hard at the patch until I saw it. I'm not going to be in a position to
> > tinker with my DAX setup until the first week of July.
>
> It bisected to this commit:
>
> b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb is the first bad commit
> commit b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb
> Author: Matthew Wilcox <willy@infradead.org>
> Date: Thu Mar 29 22:58:27 2018 -0400
>
> dax: Convert page fault handlers to XArray
>
> This is the last part of DAX to be converted to the XArray so
> remove all the old helper functions.
>
> Signed-off-by: Matthew Wilcox <willy@infradead.org>
I think I see a bug. No idea if it's the one you're hitting ;-)
I had been intending to not use the 'entry' to decide whether we were
waiting on a 2MB or 4kB page, but rather the xas. I shelved that idea,
but not before dropping the DAX_PMD flag being passed from the PMD
pagefault caller. So if I put that back ...
diff --git a/fs/dax.c b/fs/dax.c
index 9919b6b545fb..75cc160d2f0b 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -367,13 +367,13 @@ static struct page *dax_busy_page(void *entry)
* a VM_FAULT code, encoded as an xarray internal entry. The ERR_PTR values
* overlap with xarray value entries.
*/
-static
-void *grab_mapping_entry(struct xa_state *xas, struct address_space *mapping)
+static void *grab_mapping_entry(struct xa_state *xas,
+ struct address_space *mapping, unsigned long size)
{
bool pmd_downgrade = false; /* splitting 2MiB entry into 4k entries? */
void *locked = dax_make_entry(pfn_to_pfn_t(0),
- DAX_EMPTY | DAX_LOCKED);
- void *unlocked = dax_make_entry(pfn_to_pfn_t(0), DAX_EMPTY);
+ size | DAX_EMPTY | DAX_LOCKED);
+ void *unlocked = dax_make_entry(pfn_to_pfn_t(0), size | DAX_EMPTY);
void *entry;
retry:
@@ -1163,7 +1163,7 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
if (write && !vmf->cow_page)
flags |= IOMAP_WRITE;
- entry = grab_mapping_entry(&xas, mapping);
+ entry = grab_mapping_entry(&xas, mapping, 0);
if (xa_is_internal(entry)) {
ret = xa_to_internal(entry);
goto out;
@@ -1396,7 +1396,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
* page is already in the tree, for instance), it will return
* VM_FAULT_FALLBACK.
*/
- entry = grab_mapping_entry(&xas, mapping);
+ entry = grab_mapping_entry(&xas, mapping, DAX_PMD);
if (xa_is_internal(entry)) {
result = xa_to_internal(entry);
goto fallback;
next prev parent reply other threads:[~2018-06-19 17:16 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-17 1:59 [PATCH v14 00/74] Convert page cache to XArray Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 01/74] Update email address Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 02/74] radix tree test suite: Enable ubsan Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 03/74] dax: Fix use of zero page Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 04/74] xarray: Replace exceptional entries Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 05/74] xarray: Change definition of sibling entries Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 06/74] xarray: Add definition of struct xarray Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 07/74] xarray: Define struct xa_node Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 08/74] xarray: Add documentation Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 09/74] xarray: Add XArray load operation Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 10/74] xarray: Add XArray tags Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 11/74] xarray: Add XArray unconditional store operations Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 12/74] xarray: Add XArray conditional " Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 13/74] xarray: Add XArray iterators Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 14/74] xarray: Extract entries from an XArray Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 15/74] xarray: Destroy " Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 16/74] xarray: Step through " Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 17/74] xarray: Add xas_for_each_conflict Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 18/74] xarray: Add xas_create_range Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 19/74] xarray: Add MAINTAINERS entry Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 20/74] page cache: Rearrange address_space Matthew Wilcox
2018-06-17 1:59 ` [PATCH v14 21/74] page cache: Convert hole search to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 22/74] page cache: Add and replace pages using the XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 23/74] page cache: Convert page deletion to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 24/74] page cache: Convert find_get_entry " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 25/74] page cache: Convert find_get_entries " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 26/74] page cache: Convert find_get_pages_range " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 27/74] page cache: Convert find_get_pages_contig " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 28/74] page cache; Convert find_get_pages_range_tag " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 29/74] page cache: Convert find_get_entries_tag " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 30/74] page cache: Convert filemap_map_pages " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 31/74] radix tree test suite: Convert regression1 " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 32/74] page cache: Convert delete_batch " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 33/74] page cache: Remove stray radix comment Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 34/74] page cache: Convert filemap_range_has_page to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 35/74] mm: Convert page-writeback " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 36/74] mm: Convert workingset " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 37/74] mm: Convert truncate " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 38/74] mm: Convert add_to_swap_cache " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 39/74] mm: Convert delete_from_swap_cache " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 40/74] mm: Convert __do_page_cache_readahead " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 41/74] mm: Convert page migration " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 42/74] mm: Convert huge_memory " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 43/74] mm: Convert collapse_shmem " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 44/74] mm: Convert khugepaged_scan_shmem " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 45/74] mm: Convert is_page_cache_freeable " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 46/74] pagevec: Use xa_tag_t Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 47/74] shmem: Convert shmem_radix_tree_replace to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 48/74] shmem: Convert shmem_confirm_swap " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 49/74] shmem: Convert find_swap_entry " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 50/74] shmem: Convert shmem_add_to_page_cache " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 51/74] shmem: Convert shmem_alloc_hugepage " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 52/74] shmem: Convert shmem_free_swap " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 53/74] shmem: Convert shmem_partial_swap_usage " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 54/74] memfd: Convert memfd_wait_for_pins " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 55/74] memfd: Convert memfd_tag_pins " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 56/74] shmem: Comment fixups Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 57/74] btrfs: Convert page cache to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 58/74] fs: Convert buffer " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 59/74] fs: Convert writeback " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 60/74] nilfs2: Convert " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 61/74] f2fs: " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 62/74] dax: Rename some functions Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 63/74] dax: Hash on XArray instead of mapping Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 64/74] dax: Convert dax_insert_pfn_mkwrite to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 65/74] dax: Convert dax_layout_busy_page " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 66/74] dax: Convert __dax_invalidate_entry " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 67/74] dax: Convert dax writeback " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 68/74] dax: Convert dax_lock_page " Matthew Wilcox
2018-06-29 17:30 ` Ross Zwisler
2018-07-06 11:54 ` [PATCH] fs/dax: remove unused function Anders Roxell
2018-07-06 13:04 ` [PATCH v14 68/74] dax: Convert dax_lock_page to XArray Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 69/74] dax: Convert page fault handlers " Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 70/74] page cache: Finish XArray conversion Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 71/74] radix tree: Remove radix_tree_update_node_t Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 72/74] radix tree: Remove split/join code Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 73/74] radix tree: Remove radix_tree_maybe_preload_order Matthew Wilcox
2018-06-17 2:00 ` [PATCH v14 74/74] radix tree: Remove radix_tree_clear_tags Matthew Wilcox
2018-06-19 3:12 ` [PATCH v14 00/74] Convert page cache to XArray Ross Zwisler
2018-06-19 9:22 ` Matthew Wilcox
2018-06-19 16:40 ` Ross Zwisler
2018-06-19 17:16 ` Matthew Wilcox [this message]
2018-06-27 11:05 ` Matthew Wilcox
2018-06-27 19:44 ` Ross Zwisler
2018-06-28 8:39 ` Matthew Wilcox
2018-06-28 16:30 ` Ross Zwisler
2018-07-25 21:03 ` Matthew Wilcox
2018-07-25 21:12 ` Ross Zwisler
2018-07-27 17:20 ` Ross Zwisler
2018-07-30 15:43 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180619171638.GE1438@bombadil.infradead.org \
--to=willy@infradead.org \
--cc=hch@lst.de \
--cc=jack@suse.cz \
--cc=jaegeuk@kernel.org \
--cc=jlayton@redhat.com \
--cc=konishi.ryusuke@lab.ntt.co.jp \
--cc=lczerner@redhat.com \
--cc=linux-f2fs-devel@lists.sourceforge.net \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nilfs@vger.kernel.org \
--cc=npiggin@gmail.com \
--cc=rgoldwyn@suse.com \
--cc=ross.zwisler@linux.intel.com \
--cc=yuchao0@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).