Messages in this thread Patch in this message | | | Date | Tue, 16 Dec 2008 08:45:31 +0100 | From | Peter Zijlstra <> | Subject | [PATCH 2/3] sched: optimize update_curr() |
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Skip the hard work when there is none.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> --- kernel/sched_fair.c | 2 ++ 1 file changed, 2 insertions(+)
Index: linux-2.6/kernel/sched_fair.c =================================================================== --- linux-2.6.orig/kernel/sched_fair.c +++ linux-2.6/kernel/sched_fair.c @@ -492,6 +492,8 @@ static void update_curr(struct cfs_rq *c * overflow on 32 bits): */ delta_exec = (unsigned long)(now - curr->exec_start); + if (!delta_exec) + return; __update_curr(cfs_rq, curr, delta_exec); curr->exec_start = now; --
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