linux-kernel - Re: [patch v8 9/9] sched/tg: remove blocked_load

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Message-ID: <51C17EA4.3030401@intel.com>
Date:	Wed, 19 Jun 2013 17:49:24 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Paul Turner <pjt@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	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>,
	Jason Low <jason.low2@...com>,
	Changlong Xie <changlongx.xie@...el.com>, sgruszka@...hat.com,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [patch v8 9/9] sched/tg: remove blocked_load_avg in balance

On 06/17/2013 10:01 PM, Peter Zijlstra wrote:
> On Mon, Jun 17, 2013 at 05:20:46AM -0700, Paul Turner wrote:
>> > On Fri, Jun 7, 2013 at 12:20 AM, Alex Shi <alex.shi@...el.com> wrote:
>>> > > blocked_load_avg sometime is too heavy and far bigger than runnable load
>>> > > avg, that make balance make wrong decision. So remove it.
>> > 
>> > Ok so this is  going to have terrible effects on the correctness of
>> > shares distribution; I'm fairly opposed to it in its present form.
> Should someone take a look at the LTP cgroup tests to make sure they
> cover this properly?

Seems I have no time on this in near future. :(

But I were you, I would picked up this patch, since
1, it is simple and easy revert.
2, it wins in testing.
3, it will motivate Paul to look into this problem. ;)

-- 
Thanks
    Alex
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