linux-kernel - Re: [PATCH] sched: Get rid of unnecessary checks from select_idle

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Date:	Wed, 09 Jan 2013 15:38:11 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Mike Galbraith <efault@....de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched: Get rid of unnecessary checks from select_idle_sibling


> 
> Uh, we don't know if the target is this_cpu or previous cpu, If we just
> check the target idle status, we may miss another idle cpu. So this
> patch change the logical in this function.

But, you can fold wake_affine into select_idle_sibling(). that will save
a complicate calculation whichever cpu idle. :)

-- 
Thanks Alex
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