linux-kernel - Re: [patch v8 4/9] sched: fix slept time double counting in enqueue entity

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Date:	Fri, 21 Jun 2013 16:56:14 +0800
From:	Alex Shi <seakeel@...il.com>
To:	Lei Wen <adrian.wenl@...il.com>
CC:	Paul Turner <pjt@...gle.com>, 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>,
	Jason Low <jason.low2@...com>,
	Changlong Xie <changlongx.xie@...el.com>, sgruszka@...hat.com,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [patch v8 4/9] sched: fix slept time double counting in enqueue
 entity

On 06/21/2013 10:50 AM, Lei Wen wrote:
> I see your point... I made the mistake that update the wrong patch...
> Please help check this one.
> 
> commit 5fc3d5c74f8359ef382d9a20ffe657ffc237c109
> Author: Lei Wen <leiwen@...vell.com>
> Date:   Thu Jun 20 10:43:59 2013 +0800
> 
>     sched: fix potential twice decay issue
> 
>     Signed-off-by: Lei Wen <leiwen@...vell.com>
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index c61a614..9640c66 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -5856,7 +5856,8 @@ static void switched_from_fair(struct rq *rq,
> struct task_struct *p)
>         */
>         if (p->se.avg.decay_count) {
>                 struct cfs_rq *cfs_rq = cfs_rq_of(&p->se);
> -               __synchronize_entity_decay(&p->se);
> +               p->se.avg.last_runnable_update +=
> +                               __synchronize_entity_decay(&p->se);

it is not needed, since the last_runnable_update will be reset if it
will be switched to fair.

-- 
Thanks
    Alex
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