linux-kernel - Re: [discussion]sched: a rough proposal to enable power saving in scheduler

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Message-ID: <502CFD35.5000801@linux.intel.com>
Date:	Thu, 16 Aug 2012 07:01:25 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	preeti <preeti@...ux.vnet.ibm.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alex Shi <alex.shi@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	vincent.guittot@...aro.org, svaidy@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

> *Power policy*:
> 
> So how is power policy different? As Peter says,'pack more than spread
> more'.

this is ... a dubiously general statement.

for good power, at least on Intel cpus, you want to spread. Parallelism is efficient.

the only thing you do not want to do, is wake cpus up for
tasks that only run extremely briefly (think "100 usec" or less).

so maybe the balance interval is slightly different, or more, you don't balance tasks that
historically ran only for brief periods


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