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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html