linux-kernel - Re: [patch v4 07/18] sched: set initial load avg of new forked task

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Date:	Wed, 13 Feb 2013 23:14:43 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	torvalds@...ux-foundation.org, mingo@...hat.com,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v4 07/18] sched: set initial load avg of new forked task

On 02/12/2013 06:26 PM, Peter Zijlstra wrote:
> On Thu, 2013-01-24 at 11:06 +0800, Alex Shi wrote:
>> +       /*
>> +        * set the initial load avg of new task same as its load
>> +        * in order to avoid brust fork make few cpu too heavier
>> +        */
>> +       if (flags & ENQUEUE_NEWTASK)
>> +               se->avg.load_avg_contrib = se->load.weight; 
> 
> I seem to have vague recollections of a discussion with pjt where we
> talk about the initial behaviour of tasks; from this haze I had the
> impression that new tasks should behave like full weight..
> 

Here just make the new task has full weight..

> PJT is something more fundamental screwy?
> 


-- 
Thanks
    Alex
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