linux-kernel - Re: [PATCH v4 1/3] sched: Reduce overestimating rq->avg

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Message-ID: <20130902063605.GU1720@linux.vnet.ibm.com>
Date:	Mon, 2 Sep 2013 12:06:05 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Jason Low <jason.low2@...com>
Cc:	mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, efault@....de, pjt@...gle.com,
	preeti@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	mgorman@...e.de, riel@...hat.com, aswin@...com, scott.norton@...com
Subject: Re: [PATCH v4 1/3] sched: Reduce overestimating rq->avg_idle

* Jason Low <jason.low2@...com> [2013-08-29 13:05:34]:

> When updating avg_idle, if the delta exceeds some max value, then avg_idle
> gets set to the max, regardless of what the previous avg was. This can cause
> avg_idle to often be overestimated.
> 
> This patch modifies the way we update avg_idle by always updating it with the
> function call to update_avg() first. Then, if avg_idle exceeds the max, we set
> it to the max.
> 
> Signed-off-by: Jason Low <jason.low2@...com>
> Reviewed-by: Rik van Riel <riel@...hat.com>

Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---

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