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

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Message-ID: <502C8798.8060807@intel.com>
Date:	Thu, 16 Aug 2012 13:39:36 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.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>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On 08/16/2012 01:31 PM, Matthew Garrett wrote:

> On Thu, Aug 16, 2012 at 01:03:32PM +0800, Alex Shi wrote:
>> On 08/16/2012 12:19 AM, Matthew Garrett wrote:
>>> Are there workloads in which "power" might provide more performance than 
>>> "performance"? If so, don't use these terms.
>>
>> Power scheme should no chance has better performance in design.
> 
> Power will tend to concentrate processes on packages, 


yes.

while performance 
> will tend to split them across packages?


No, there is still has balance idea in this rough proposal. If a domain
is not overload, it is better to left old tasks unchanged. I should say,
current scheduler is the 'performance' trend scheme.

 What if two cooperating 
> processes gain from being on the same package and sharing cache 
> locality?
> 

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