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| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-02-13 14:39:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-13 21:21:40 -0800 |
| commit | 4d5755b147665912c938504033d958f1115b68ff (patch) | |
| tree | 61d7a0fb45a279b10439caaa323373ba6f5729a0 /fs/eventpoll.c | |
| parent | 0f3c5aab5e00527eb3167aa9d1725cca9320e01e (diff) | |
| download | linux-stable-4d5755b147665912c938504033d958f1115b68ff.tar.gz linux-stable-4d5755b147665912c938504033d958f1115b68ff.tar.bz2 linux-stable-4d5755b147665912c938504033d958f1115b68ff.zip | |
epoll: optimize setting task running after blocking
After waking up a task waiting for an event, we explicitly mark it as
TASK_RUNNING (which is necessary as we do the checks for wakeups as
TASK_INTERRUPTIBLE). Once running and dealing with actually delivering
the events, we're obviously not planning on calling schedule, thus we can
relax the implied barrier and simply update the state with
__set_current_state().
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index d77f94491352..1e009cad8d5c 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1639,9 +1639,9 @@ fetch_events: spin_lock_irqsave(&ep->lock, flags); } - __remove_wait_queue(&ep->wq, &wait); - set_current_state(TASK_RUNNING); + __remove_wait_queue(&ep->wq, &wait); + __set_current_state(TASK_RUNNING); } check_events: /* Is it worth to try to dig for events ? */ |