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

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Message-ID: <51BF297B.7090409@intel.com>
Date:	Mon, 17 Jun 2013 23:21:31 +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 10:57 PM, Alex Shi wrote:
>> > 
>> > 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

a bit more explain, cc/ld finished cpu task then wait IO to write object
files into disk.
> disappeared quickly. blocked_load_avg cause trouble in kbuild.


-- 
Thanks
    Alex
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