linux-kernel - Re: [PATCH v5 2/7] sched: remove SMP cover for runnable variables in cfs

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Message-ID: <5187708A.20103@intel.com>
Date:	Mon, 06 May 2013 16:57:46 +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 v5 2/7] sched: remove SMP cover for runnable variables
 in cfs_rq

On 05/06/2013 04:01 PM, Paul Turner wrote:
> On Sun, May 5, 2013 at 6:45 PM, Alex Shi <alex.shi@...el.com> wrote:
>> The following variables were covered under CONFIG_SMP in struct cfs_rq.
>> but similar runnable variables work for UP in struct rq and task_group.
>> like rq->avg, task_group->load_avg.
>> So move them out, they also can work with UP.
> 
> Is there a proposed use-case for UP?  My apologies if I missed it in
> an alternate patch.

> It would seem the only possibly useful thing there would the the
> per-rq average for p-state selection; but we can get that without the
> per-entity values already.


Do you mean to move the rq->avg and task_group->load_avg into CONFIG_SMP?

-- 
Thanks
    Alex
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