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Message-ID: <47480F2D.3030408@suse.de> Date: Sat, 24 Nov 2007 17:16:53 +0530 From: Nikanth Karthikesan <knikanth@...e.de> To: mingo@...e.hu Cc: dmitry.adamushko@...il.com, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com Subject: [PATCH] sched: minor optimization As an optimization, if all tasks are in the fair class, the next task is directly picked from fair_sched_class. But, if it returns no task we go through again from sched_class_highest which could be avoided and instead return the idle task directly. Signed-off-by : Nikanth Karthikesan <knikanth@...e.de> --- kernel/sched.c | 2 ++ 1 file changed, 2 insertions(+) Index: b/kernel/sched.c =================================================================== --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3449,6 +3449,8 @@ pick_next_task(struct rq *rq, struct tas p = fair_sched_class.pick_next_task(rq); if (likely(p)) return p; + else /* rq->nr_running is zero */ + return idle_sched_class.pick_next_task(rq); } class = sched_class_highest; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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