The patch titled
Subject: epoll: optimize setting task running after blocking
has been added to the -mm tree. Its filename is
epoll-optimize-setting-task-running-after-blocking.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/epoll-optimize-setting-task-running-after-blocking.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/epoll-optimize-setting-task-running-after-blocking.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Subject: 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_INTERRUPTABLE). 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@xxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventpoll.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/eventpoll.c~epoll-optimize-setting-task-running-after-blocking fs/eventpoll.c
--- a/fs/eventpoll.c~epoll-optimize-setting-task-running-after-blocking
+++ a/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 ? */
_
Patches currently in -mm which might be from dave@xxxxxxxxxxxx are
epoll-optimize-setting-task-running-after-blocking.patch
signal-use-current-state-helpers.patch
ipcsem-use-current-state-helpers.patch
linux-next.patch
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