linux-kernel - Re: [PATCH v3 09/22] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Message-ID: <1358905643.5752.8.camel@marge.simpson.net>
Date:	Wed, 23 Jan 2013 02:47:23 +0100
From:	Mike Galbraith <efault@....de>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Paul Turner <pjt@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>, namhyung@...nel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	preeti@...ux.vnet.ibm.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 09/22] sched: compute runnable load avg in cpu_load
 and cpu_avg_load_per_task

On Wed, 2013-01-23 at 08:36 +0800, Alex Shi wrote: 
> On 01/22/2013 05:52 PM, Mike Galbraith wrote:
> > On Tue, 2013-01-22 at 15:50 +0800, Alex Shi wrote:
> > 
> >> Thanks for your suggestions and example, Mike!
> >> I just can't understand the your last words here, Sorry. what the
> >> detailed concern of you on 'both performance profiles with either
> >> metric'? Could you like to give your preferred solutions?
> > 
> > Hm.. I'll try rephrasing.  Any power saving gain will of necessity be
> > paid for in latency currency.  I don't have a solution other than make a
> > button, let the user decide whether history influences fast path task
> > placement or not.  Any other decision maker will get it wrong.
> 
> Um, if no other objection, I'd like to move the runnable load only used
> for power friendly policy -- for this patchset, they are 'powersaving'
> and 'balance', Can I?

Yeah, that should work be fine.

-Mike

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