linux-kernel - Re: [patch v5 09/15] sched: add power aware scheduling in fork/exec/wake

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Message-ID: <1361762585.4555.28.camel@marge.simpson.net>
Date:	Mon, 25 Feb 2013 04:23:05 +0100
From:	Mike Galbraith <efault@....de>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, morten.rasmussen@....com
Subject: Re: [patch v5 09/15] sched: add power aware scheduling in
 fork/exec/wake

On Mon, 2013-02-25 at 10:23 +0800, Alex Shi wrote:

> One of problem is the how to decide the criteria of the burst? If we set
> 5 waking up/ms is burst, we will lose 4 waking up/ms.
> another problem is the burst detection cost, we need tracking a period
> history info of the waking up, better on whole group. but that give the
> extra cost in burst.
> 
> solution candidates:
> https://lkml.org/lkml/2013/1/21/316
> After talk with MikeG, I remove the runnable load avg in performance
> load balance.

One thing you could try is to make criteria depend on avg_idle.  It will
slam to 2*migration_cost when a wakeup arrives after an ~extended idle.
You could perhaps extend it to cover new task wakeup as well, and use
that transition to invalidate history, switch to instantaneous until
fresh history can accumulate.

-Mike

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