sched: Update the clock of runqueue select_task_rq() selected

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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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Mike Galbraith 2009-10-09 08:35:03 +02:00 • committed by Ingo Molnar

parent 36a07902c2

commit f5dc37530b

1 changed files with 6 additions and 2 deletions

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kernel/sched.c

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