+ epoll-optimize-setting-task-running-after-blocking.patch added to -mm tree

+ epoll-optimize-setting-task-running-after-blocking.patch added to -mm tree

[akpm]

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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------------------------------------------------------
From: Davidlohr Bueso <dave@stgolabs.net>
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@suse.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@stgolabs.net are

epoll-optimize-setting-task-running-after-blocking.patch
signal-use-current-state-helpers.patch
ipcsem-use-current-state-helpers.patch
linux-next.patch