linux-kernel - Re: [patch 0/8]: use runnable load avg in balance

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Date:	Tue, 14 May 2013 22:35:36 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Paul Turner <pjt@...gle.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>
Subject: Re: [patch 0/8]: use runnable load avg in balance

On 05/14/2013 05:34 PM, Paul Turner wrote:
>> >
>> > We also tried to include blocked load avg in balance. but find many benchmark
>> > performance dropping. Guess the too bigger cpu load drive task to be waken
>> > on remote CPU, and cause wrong decision in periodic balance.
> Fundamentally, I think we should be exploring this space.

I thought something of this. but can not figure out a direction or stand
by some theories.
> 
> While it's perhaps not surprising that it's not a drop-in, since the
> current code was tuned always considering the instaneous balance, it
> seems the likely path to increased balance stability.
> 
> Although, if the code is yielding substantive benefits in its current
> form we should consider merging it in the interim.

Sorry, I can not follow you here.
> 



-- 
Thanks
    Alex
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