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

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Date:	Tue, 22 Jan 2013 10:52:18 +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 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.

-Mike

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