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| author | Eric Paris <eparis@redhat.com> | 2009-07-15 15:49:52 -0400 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2009-07-21 15:26:27 -0400 |
| commit | f44aebcc566d1d6275f7191867b9633dc11de2ee (patch) | |
| tree | a5faaf5ca8e1360f359ee22ad29582992596c3e6 /fs/notify/fsnotify.c | |
| parent | c05594b62125c528d93af3a78229793aae36df7f (diff) | |
| download | linux-f44aebcc566d1d6275f7191867b9633dc11de2ee.tar.gz linux-f44aebcc566d1d6275f7191867b9633dc11de2ee.tar.bz2 linux-f44aebcc566d1d6275f7191867b9633dc11de2ee.zip | |
inotify: use GFP_NOFS under potential memory pressure
inotify can have a watchs removed under filesystem reclaim.
=================================
[ INFO: inconsistent lock state ]
2.6.31-rc2 #16
---------------------------------
inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
khubd/217 [HC0[0]:SC0[0]:HE1:SE1] takes:
(iprune_mutex){+.+.?.}, at: [<c10ba899>] invalidate_inodes+0x20/0xe3
{IN-RECLAIM_FS-W} state was registered at:
[<c10536ab>] __lock_acquire+0x2c9/0xac4
[<c1053f45>] lock_acquire+0x9f/0xc2
[<c1308872>] __mutex_lock_common+0x2d/0x323
[<c1308c00>] mutex_lock_nested+0x2e/0x36
[<c10ba6ff>] shrink_icache_memory+0x38/0x1b2
[<c108bfb6>] shrink_slab+0xe2/0x13c
[<c108c3e1>] kswapd+0x3d1/0x55d
[<c10449b5>] kthread+0x66/0x6b
[<c1003fdf>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
Two things are needed to fix this. First we need a method to tell
fsnotify_create_event() to use GFP_NOFS and second we need to stop using
one global IN_IGNORED event and allocate them one at a time. This solves
current issues with multiple IN_IGNORED on a queue having tail drop
problems and simplifies the allocations since we don't have to worry about
two tasks opperating on the IGNORED event concurrently.
Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/notify/fsnotify.c')
| -rw-r--r-- | fs/notify/fsnotify.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index ec2f7bd76818..037e878e03fc 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -159,7 +159,9 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const if (!group->ops->should_send_event(group, to_tell, mask)) continue; if (!event) { - event = fsnotify_create_event(to_tell, mask, data, data_is, file_name, cookie); + event = fsnotify_create_event(to_tell, mask, data, + data_is, file_name, cookie, + GFP_KERNEL); /* shit, we OOM'd and now we can't tell, maybe * someday someone else will want to do something * here */ |