linux-kernel - Re: [RFC PATCH 1/2] sched/update

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Message-ID: <52DE0CB7.3040803@linaro.org>
Date:	Tue, 21 Jan 2014 13:59:19 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	mingo@...hat.com, peterz@...radead.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	efault@....de
CC:	wangyun@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Alex Shi <alex.shi@...aro.org>
Subject: Re: [RFC PATCH 1/2] sched/update_avg: avoid negative time

On 01/21/2014 01:33 PM, Alex Shi wrote:
> rq->avg_idle try to reflect the average idle time between the cpu idle
> and first wakeup. But in the function, it maybe get a negative value
> if old avg_idle is too small. Then this negative value will be double
> counted in next time calculation. Guess that is not the original purpose,
> so recalibrate it to zero.

Forget this patch, the avg_idle is impossible to get negative.
Sorry for noise!


-- 
Thanks
    Alex
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