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

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Message-ID: <502BE38D.9030405@linux.intel.com>
Date:	Wed, 15 Aug 2012 10:59:41 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	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 8:04 AM, Peter Zijlstra wrote:
> This all sounds far too complicated.. we're talking about simple
> spreading and packing balancers without deep arch knowledge and knobs,
> we couldn't possibly evaluate anything like that.
> 
> I was really more thinking of something useful for the laptops out
> there, when they pull the power cord it makes sense to try and keep CPUs
> asleep until the one that's awake is saturated.

as long as you don't do that on machines with an Intel CPU.. since that'd be
the worst case behavior for tasks that run for more than 100 usec.
(e.g. not interrupts, but almost everything else)




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