linux-kernel - Re: [PATCH] sched: avoid unnecessary overflow in sched

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Message-ID: <1321433782.1421.71.camel@twins>
Date:	Wed, 16 Nov 2011 09:56:22 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	Mike Galbraith <efault@....de>, john stultz <johnstul@...ibm.com>,
	Salman Qazi <sqazi@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: avoid unnecessary overflow in sched_clock

On Tue, 2011-11-15 at 23:08 -0800, Paul Turner wrote:
> Probably a good idea -- This especially sucks rocks in the sched_clock_stable==1 
> case; resulting in it coming straight back out of sched_clock_cpu() and trashing 
> rq->clock. 

There's another problem there in that TSC will wrap too soon and things
will blow up in your face that way.


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