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

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Date:	Fri, 17 Aug 2012 09:29:28 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
CC:	preeti <preeti@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 08/16/2012 10:01 PM, Arjan van de Ven wrote:

>> *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).


It's a very important and valuable info!
Just want to know how you get this? From CS cost or cache/TLB refill cost?

> 
> 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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