linux-kernel - Re: [PATCH v2 13/14] provide a version of cpuusage statistics inside cpu cgroup

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Message-ID: <4EBAAFAC.90205@parallels.com>
Date:	Wed, 9 Nov 2011 14:51:56 -0200
From:	Glauber Costa <glommer@...allels.com>
To:	Andrew Wagin <avagin@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <daniel.lezcano@...e.fr>,
	<a.p.zijlstra@...llo.nl>, <jbottomley@...allels.com>,
	<pjt@...gle.com>, <fweisbec@...il.com>,
	Balbir Singh <bsingharora@...il.com>
Subject: Re: [PATCH v2 13/14] provide a version of cpuusage statistics inside
 cpu cgroup

On 11/09/2011 12:18 PM, Andrew Wagin wrote:
> And look at cfs_rq->prev_sum_exec_runtime, probably it is not used too.
> Usage of cfs_rq->sum_exec_runtime looks strange.

No, it is not.
se->sum_exec_runtime is a per-se measure. It follows the task group as 
it moves from rq to rq. cfs->rq->sum_exec_runtime (and it's rt 
counterpart) is a measurement of accumulated runtime of all tasks that 
ever passed through this rq.
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