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

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Message-ID: <502C8479.1090704@intel.com>
Date:	Thu, 16 Aug 2012 13:26:17 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Rakib Mullick <rakib.mullick@...il.com>,
	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 08/15/2012 10:55 PM, Peter Zijlstra wrote:

> On Wed, 2012-08-15 at 20:24 +0600, Rakib Mullick wrote:
>> How do you plan to test this power saving scheme? Using powertop? Or,
>> is there any other tools? 
> 
> We should start out simple enough that we can validate it by looking at
> task placement by hand, eg. 4 tasks on a dual socket quad-core, should
> only keep one socket awake.
> 
> We can also add an power aware evaluator to Linsched (another one of
> those things that needs getting sorted).
> 
> And yeah, someone running with a power meter is of course king.
> 
> _BUT_ we shouldn't go off the wall with power meters as that very
> quickly gets very specific to the system being measured.
> 
> We should really keep this thing as simple as possible while still
> providing some benefit for all various architectures without tons of per
> arch knobs and knowhow.


Definitely agree all!
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