linux-kernel - Re: [patch v8 8/9] sched: consider runnable load average in move

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Date:	Mon, 17 Jun 2013 22:15:26 +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 8/9] sched: consider runnable load average in move_tasks

On 06/17/2013 10:01 PM, Alex Shi wrote:
> On 06/17/2013 06:58 PM, Paul Turner wrote:
>>>> +               unsigned long tmp_rla;
>>>> +               tmp_rla = tg->parent->cfs_rq[cpu]->runnable_load_avg + 1;
>>>> +
>>>>                 load = tg->parent->cfs_rq[cpu]->h_load;
>>>> -               load *= tg->se[cpu]->load.weight;
>>>> -               load /= tg->parent->cfs_rq[cpu]->load.weight + 1;
>>>> +               load *= tg->se[cpu]->avg.load_avg_contrib;
>>>> +               load /= tmp_rla;
>> Why do we need the temporary here?
>>
> 
> you'r right. tmp_rla is not necessary here.
> 

Sorry, not, tmp_rla is a imply type casting. otherwise long /= u64; has
building issue on 32 bit according to Morten.
and a clear type casting cross 2 lines.

-- 
Thanks
    Alex
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