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authorVincent Guittot <vincent.guittot@linaro.org>2011-12-12 20:21:08 +0100
committerIngo Molnar <mingo@elte.hu>2012-01-27 13:28:49 +0100
commit4ec4412e1e91f44a3dcb97b6c9172a13fc78bac9 (patch)
treea98f635907975c2f14c01c24418e102337250b8d /kernel/sched/stats.c
parent39be350127ec60a078edffe5b4915dafba4ba514 (diff)
downloadlinaro-lsk-4ec4412e1e91f44a3dcb97b6c9172a13fc78bac9.tar.gz
sched: Ensure cpu_power periodic update
With a lot of small tasks, the softirq sched is nearly never called when no_hz is enabled. In this case load_balance() is mainly called with the newly_idle mode which doesn't update the cpu_power. Add a next_update field which ensure a maximum update period when there is short activity. Having stale cpu_power information can skew the load-balancing decisions, this is cured by the guaranteed update. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1323717668-2143-1-git-send-email-vincent.guittot@linaro.org
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