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SubjectRe: [RFC/PATCH] sched: Honor sync wake up in select_idle_sibling
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Hi, Mike

On Fri, 10 Aug 2012 10:14:44 +0200, Mike Galbraith wrote:
> On Fri, 2012-08-10 at 16:25 +0900, Namhyung Kim wrote:
>> From: Namhyung Kim <namhyung.kim@lge.com>
>>
>> When sync wakeup happens and there's the waker task running alone,
>> select the target cpu as if it's already idle.
>
> Ouch. That defeats the purpose of select_idle_sibling(). Just because
> we're doing a sync wakeup does not mean there's no convertible overlap,
> nor that the waker is really really going to take a nap immediately. A
> lot of the places that benefit up to and including hugely from looking
> for an idle shared cache to wake to do sync wakeups.

Thanks for the explanation! I misunderstood the function ;)

Thanks,
Namhyung



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