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* [PATCH v10 0/4] xfs: avoid transaction reservation recursion
@ 2020-12-08  2:15 Yafang Shao
  2020-12-08  2:15 ` [PATCH v10 1/4] mm: Add become_kswapd and restore_kswapd Yafang Shao
                   ` (3 more replies)
  0 siblings, 4 replies; 11+ messages in thread
From: Yafang Shao @ 2020-12-08  2:15 UTC (permalink / raw)
  To: darrick.wong, willy, david, hch, mhocko, akpm, dhowells, jlayton
  Cc: linux-fsdevel, linux-cachefs, linux-xfs, linux-mm, Yafang Shao

PF_FSTRANS which is used to avoid transaction reservation recursion, is
dropped since commit 9070733b4efa ("xfs: abstract PF_FSTRANS to
PF_MEMALLOC_NOFS") and commit 7dea19f9ee63 ("mm: introduce
memalloc_nofs_{save,restore} API"), and replaced by PF_MEMALLOC_NOFS which
means to avoid filesystem reclaim recursion.

As these two flags have different meanings, we'd better reintroduce
PF_FSTRANS back. To avoid wasting the space of PF_* flags in task_struct,
we can reuse the current->journal_info to do that, per Willy. As the 
check of transaction reservation recursion is used by XFS only, we can 
move the check into xfs_vm_writepage(s), per Dave.

Patch #1 and #2 are to use the memalloc_nofs_{save,restore} API,
which is introduced in
commit 7dea19f9ee63 ("mm: introduce memalloc_nofs_{save,restore} API"),
instead of using PF_MEMALLOC_NOFS directly in XFS.
Patch #1 is picked form Willy's patchset "Overhaul memalloc_no*"[1]

Patch #3 is the refactor of xfs_trans context, which is activated when
xfs_trans is allocated and deactivated when xfs_trans is freed.

Patch #4 is the implementation of reussing current->journal_info to
avoid transaction reservation recursion.

No obvious error occurred after running xfstests.

[1]. https://lore.kernel.org/linux-mm/20200625113122.7540-1-willy@infradead.org

v10:
- refactor the code, per Dave.

v9:
- rebase it on xfs tree.
- Darrick fixed an error occurred in xfs/141
- run xfstests, and no obvious error occurred.

v8:
- check xfs_trans_context_active() in xfs_vm_writepage(s), per Dave.

v7:
- check fstrans recursion for XFS only, by introducing a new member in
  struct writeback_control.

v6:
- add Michal's ack and comment in patch #1.

v5:
- pick one of Willy's patch
- introduce four new helpers, per Dave

v4:
- retitle from "xfs: introduce task->in_fstrans for transaction reservation
  recursion protection"
- reuse current->journal_info, per Willy


Matthew Wilcox (Oracle) (1):
  mm: Add become_kswapd and restore_kswapd

Yafang Shao (3):
  xfs: use memalloc_nofs_{save,restore} in xfs transaction
  xfs: refactor the usage around xfs_trans_context_{set,clear}
  xfs: use current->journal_info to avoid transaction reservation
    recursion

 fs/iomap/buffered-io.c    |  7 -------
 fs/xfs/libxfs/xfs_btree.c | 14 ++++++++------
 fs/xfs/xfs_aops.c         | 21 +++++++++++++++++++--
 fs/xfs/xfs_linux.h        |  4 ----
 fs/xfs/xfs_trans.c        | 24 +++++++++++-------------
 fs/xfs/xfs_trans.h        | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/sched/mm.h  | 23 +++++++++++++++++++++++
 mm/vmscan.c               | 16 +---------------
 8 files changed, 99 insertions(+), 47 deletions(-)

-- 
2.18.4


^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2020-12-08  5:03 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-08  2:15 [PATCH v10 0/4] xfs: avoid transaction reservation recursion Yafang Shao
2020-12-08  2:15 ` [PATCH v10 1/4] mm: Add become_kswapd and restore_kswapd Yafang Shao
2020-12-08  2:15 ` [PATCH v10 2/4] xfs: use memalloc_nofs_{save,restore} in xfs transaction Yafang Shao
2020-12-08  2:46   ` Matthew Wilcox
2020-12-08  3:05     ` Yafang Shao
2020-12-08  2:15 ` [PATCH v10 3/4] xfs: refactor the usage around xfs_trans_context_{set,clear} Yafang Shao
2020-12-08  2:15 ` [PATCH v10 4/4] xfs: use current->journal_info to avoid transaction reservation recursion Yafang Shao
2020-12-08  2:41   ` Matthew Wilcox
2020-12-08  3:03     ` Yafang Shao
2020-12-08  4:20   ` Dave Chinner
2020-12-08  5:01     ` Yafang Shao

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