linux-kernel - Re: [tip:sched/urgent] Sched: fix skip_clock

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Message-ID: <1291997868.13513.15.camel@laptop>
Date:	Fri, 10 Dec 2010 17:17:48 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	efault@....de, bbb.lst@...il.com, tglx@...utronix.de,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/urgent] Sched: fix skip_clock_update optimization

On Fri, 2010-12-10 at 10:33 +0800, Yong Zhang wrote:
> 
> I don't see it on my side.
> Then just show some info(don't know if it's helpful):
> wake_up_idle_cpu() can set TIF_RESCHED locklessly.
> 
> So does
> WARN_ON_ONCE(next != rq->idle && test_tsk_need_resched(next));
> help?

Its a good possibility, sadly I haven't been able to reproduce so I
cannot confirm. I'll keep my machine running, maybe it will trigger in a
few hours.
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