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From: Ross Zwisler <ross.zwisler@linux.intel.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: 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>,
	Ross Zwisler <ross.zwisler@linux.intel.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: Mon, 18 Jun 2018 21:12:57 -0600	[thread overview]
Message-ID: <20180619031257.GA12527@linux.intel.com> (raw)
In-Reply-To: <20180617020052.4759-1-willy@infradead.org>

On Sat, Jun 16, 2018 at 06:59:38PM -0700, Matthew Wilcox wrote:
> The XArray is a replacement for the radix tree.  For the moment it uses
> the same data structures, enabling a gradual replacement.  This patch
> set implements the XArray and converts the page cache to use it.
> 
> A version of these patches has been running under xfstests for over
> 48 hours, so I have some confidence in them.  The DAX changes have now
> also had a reasonable test outing.  This is based on next-20180615 and
> is available as a git tree at
> git://git.infradead.org/users/willy/linux-dax.git xarray-20180615
> 
> I shall create a git branch from -rc1 and ask for that to be included in
> -next.  I'm a little concerned I still have no reviews on some of the
> later patches.
> 
> Changes since v13:
>  - Actually fixed bug in workingset conversion that led to exceptional
>    entries not being deleted from the XArray.  Not sure how I dropped
>    that patch for v13.  Thanks to David Sterba for noticing.
>  - Fixed bug in DAX writeback conversion that failed to wake up waiters.
>    Thanks to Ross for testing, and to Dan & Jeff for helping me get a
>    setup working to reproduce the problem.
>  - Converted the new dax_lock_page / dax_unlock_page functions.
>  - Moved XArray test suite entirely into the test_xarray kernel module
>    to match other test suites.  It can still be built in userspace as
>    part of the radix tree test suite.
>  - Changed email address.
>  - Moved a few functions into different patches to make the test-suite
>    additions more logical.
>  - Fixed a bug in XA_BUG_ON (oh the irony) where it evaluated the
>    condition twice.
>  - Constified xa_head() / xa_parent() / xa_entry() and their _locked
>    variants.
>  - Moved xa_parent() to xarray.h so it can be used from the workingset code.
>  - Call the xarray testsuite from the radix tree test suite to ensure
>    that I remember to run both test suites ;-)
>  - Added some more tests to the test suite.

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":

[   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
[   92.861235]  __xfs_filemap_fault+0x2de/0x310
[   92.861681]  xfs_filemap_fault+0x2c/0x30
[   92.862113]  __do_fault+0x26/0x160
[   92.862531]  __handle_mm_fault+0xc96/0x1320
[   92.863059]  handle_mm_fault+0x1ba/0x3c0
[   92.863534]  __do_page_fault+0x2b4/0x590
[   92.864029]  do_page_fault+0x38/0x2c0
[   92.864472]  do_async_page_fault+0x2c/0xb0
[   92.864985]  ? async_page_fault+0x8/0x30
[   92.865459]  async_page_fault+0x1e/0x30
[   92.865941] RIP: 0033:0x401442
[   92.866322] Code: Bad RIP value.
[   92.866739] RSP: 002b:00007fa29c9feec0 EFLAGS: 00010212
[   92.867366] RAX: 00007fa29ca00400 RBX: 0000000000001000 RCX: 0000000000008000
[   92.868219] RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000000
[   92.869082] RBP: 00007fa29c9ff700 R08: 00007fa29c9ff700 R09: 00007fa29c9ff700
[   92.869939] R10: 0000000000000070 R11: 00007fa29e571ba0 R12: 00007fa29ca00000
[   92.870804] R13: 00007fffd5f24160 R14: 0000000000000400 R15: 00007fffd5f240b0

This looks very similar to the one I reported last week with generic/269.

- Ross

  parent reply	other threads:[~2018-06-19  3:12 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-17  1:59 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 ` Ross Zwisler [this message]
2018-06-19  9:22   ` [PATCH v14 00/74] Convert page cache to XArray Matthew Wilcox
2018-06-19 16:40     ` Ross Zwisler
2018-06-19 17:16       ` Matthew Wilcox
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

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