From: Mike Galbraith <efault@gmx.de>
Date: Fri, 9 Oct 2009 06:35:03 +0000 (+0200)
Subject: sched: Update the clock of runqueue select_task_rq() selected
X-Git-Tag: v2.6.32-rc5~23^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5dc37530ba8a35aae0f7f4f13781d1904f71e94;p=pandora-kernel.git

sched: Update the clock of runqueue select_task_rq() selected

In try_to_wake_up(), we update the runqueue clock, but
select_task_rq() may select a different runqueue than the one we
updated, leaving the new runqueue's clock stale for a bit.

This patch cures occasional huge latencies reported by latencytop
when coming out of idle on a mostly idle NO_HZ box.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1255070103.7639.30.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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