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

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Message-ID: <502C4B09.6070406@linux.intel.com>
Date:	Wed, 15 Aug 2012 18:21:13 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Rik van Riel <riel@...hat.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

On 8/15/2012 6:14 PM, Rik van Riel wrote:
> 
> The idea Matthew and I have is simply planning for a shorter
> sleep period (discarding the outliers to the high end in the
> function once known as detect_repeating_patterns), and going
> to a deeper C state if we have significantly overslept.
> 
> The new estimation code is easy, but for the past days I have
> been looking through the timer code to figure out how such a
> timer could fire, and how we could recognize it without it
> looking like a normal wakeup, if we do not end up accidentally
> waking up another CPU, etc...

this sort of code we recently developed already in house;
i'm surprised it hasn't been pasted to lkml yet


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