linux-kernel - Re: [patch v8 6/9] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Date:	Mon, 17 Jun 2013 22:57:45 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Paul Turner <pjt@...gle.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	Jason Low <jason.low2@...com>,
	Changlong Xie <changlongx.xie@...el.com>, sgruszka@...hat.com,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [patch v8 6/9] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task

On 06/17/2013 06:51 PM, Paul Turner wrote:
> This looks fine.
> 
> Did you try including blocked_load_avg in only get_rq_runnable_load()
> [ and not weighted_cpuload() which is called by new-idle ]?
> 

No, but blocked_load_avg also impact periodic balance much. The ideal
scenario is a sleeping task will be waken up on same cpu. But like
kbuild benchmark, the quick cc/ld task are forked, and then finished and
disappeared quickly. blocked_load_avg cause trouble in kbuild.

-- 
Thanks
    Alex
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