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

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Date:	Mon, 06 May 2013 23:07:44 +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>
Subject: Re: [PATCH v5 6/7] sched: consider runnable load average in move_tasks

On 05/06/2013 04:53 PM, Paul Turner wrote:
>> > +static unsigned long task_h_load_avg(struct task_struct *p)
>> > +{
>> > +       return div_u64(task_h_load(p) * (u64)p->se.avg.runnable_avg_sum,
>> > +                       p->se.avg.runnable_avg_period + 1);
> Similarly, I think you also want to at least include blocked_load_avg here.
> 
> More fundamentally:
> I suspect the instability from comparing these to an average taken on
> them will not give a representative imbalance weight.  While we should
> be no worse off than the present situation; we could be doing much
> better.
> 
> Consider that by not consuming {runnable, blocked}_load_avg directly
> you are "hiding" the movement from one load-balancer to the next.

Sure, sounds reasonable, I will try it.

-- 
Thanks
    Alex
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