linux-kernel - Re: [PATCH v5 6/7] sched: consider runnable load average in move

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Date:	Fri, 10 May 2013 21:58:01 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Paul Turner <pjt@...gle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	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>
Subject: Re: [PATCH v5 6/7] sched: consider runnable load average in move_tasks

On 05/09/2013 09:24 AM, Alex Shi wrote:
> Paul,
> 
> I am wondering if the following patch needed.
> The wakeuped migrated task will __synchronize_entity_decay(se); in migrate_task_fair,
> then it needs to set `se->avg.last_runnable_update -= (-se->avg.decay_count) << 20'
> before update_entity_load_avg, in order to avoid slept time is updated twice for 
> se.avg.load_avg_contrib in both __syncchronize and update_entity_load_avg.
> 
> but if the slept task is waked up from self cpu, it miss the last_runnable_update before
>  update_entity_load_avg(se, 0, 1), so the slept time was used twice in both functions.
> Is that right?

Would you like to give some comments on this, Paul?

-- 
Thanks
    Alex
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