linux-kernel - Re: [patch v5 06/15] sched: log the cpu utilization at rq

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Message-ID: <5124BF47.7070500@linux.vnet.ibm.com>
Date:	Wed, 20 Feb 2013 17:49:19 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	torvalds@...ux-foundation.org, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	morten.rasmussen@....com
Subject: Re: [patch v5 06/15] sched: log the cpu utilization at rq

Hi everyone,

On 02/18/2013 10:37 AM, Alex Shi wrote:
> The cpu's utilization is to measure how busy is the cpu.
>         util = cpu_rq(cpu)->avg.runnable_avg_sum
>                 / cpu_rq(cpu)->avg.runnable_avg_period;

Why not cfs_rq->runnable_load_avg? I am concerned with what is the right
metric to use here.
Refer to this discussion:https://lkml.org/lkml/2012/10/29/448

Regards
Preeti U Murthy

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