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

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Message-ID: <CALZhoSQgO-V-vkOy+urL_H4cjcCE8YY3w+K=mS8hptWteKGcFw@mail.gmail.com>
Date:	Fri, 21 Jun 2013 10:30:37 +0800
From:	Lei Wen <adrian.wenl@...il.com>
To:	Alex Shi <seakeel@...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

Hi Alex,

On Thu, Jun 20, 2013 at 10:59 PM, Alex Shi <seakeel@...il.com> wrote:
> On 06/20/2013 10:46 AM, Lei Wen wrote:
>>
>>
>> But here I have a question, there is another usage of __synchronzie_entity_decay
>> in current kernel, in the switched_from_fair function.
>>
>> If task being frequently switched between rt and fair class, would it
>> also bring the
>> redundant issue? Do we need patch like below?
>>
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index b5408e1..9640c66 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -5856,7 +5856,7 @@ 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);
>> -               se->avg.last_runnable_update +=
>> +               p->se.avg.last_runnable_update +=
>
> what tree does this patch base on?

I create the patch based on v3.9 kernel.
If it is ok, I could create a formal one based on latest kernel.

Thanks,
Lei

>>                                 __synchronize_entity_decay(&p->se);
>>                 subtract_blocked_load_contrib(cfs_rq,
>>                                 p->se.avg.load_avg_contrib);
>
>
> --
> Thanks
>     Alex
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