linux-kernel - Re: [PATCH] sched: Remove WAKEUP_PREEMPT feature check in entity

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Date:	Fri, 29 Jul 2011 10:20:50 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Lin Ming <ming.m.lin@...el.com>, "mingo@...e.hu" <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: Remove WAKEUP_PREEMPT feature check in
 entity_tick

On Fri, 2011-07-29 at 16:18 +0800, Yong Zhang wrote:
> > Nah, if there is 1 runnable task it will always run, preemption simply
> > doesn't matter. There's nothing to preempt it with.
> 
> Hmmm, so the newly waked task could be scheduled a little later.
> That means schedule tick judge everything. 

Oh, are you referring to the case where a task gets woken on an idle
remote cpu?
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