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

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Message-ID: <alpine.LFD.2.02.1208151646430.32033@ionos>
Date:	Wed, 15 Aug 2012 16:47:15 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	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>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On Wed, 15 Aug 2012, Peter Zijlstra wrote:

> On Wed, 2012-08-15 at 07:19 -0700, Arjan van de Ven wrote:
> > Ideally the scheduler builds up some history of the typical run
> > duration of the task (with a bias to more recent runs).
> > But... even then, the past is only a poor predictor for the future. 
> 
> PJTs patches do this. But yes, a crystal-ball instruction which
> completes in a single cycle would be most appreciated :-)

You could ask the S390 folks whether they could whip one up for proof
of concept. :)

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