linux-kernel - Re: [PATCH v2 02/11] sched: remove a wake

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Message-ID: <CAKfTPtAGX2_=z5EHAqn7Tz7vVEeK673TONSwQ-4JUwURsn=ueA@mail.gmail.com>
Date:	Tue, 27 May 2014 17:20:10 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 02/11] sched: remove a wake_affine condition

On 27 May 2014 15:45, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, May 23, 2014 at 05:52:56PM +0200, Vincent Guittot wrote:
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index 9587ed1..30240ab 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -4238,7 +4238,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
>>  {
>>       s64 this_load, load;
>>       int idx, this_cpu, prev_cpu;
>> -     unsigned long tl_per_task;
>>       struct task_group *tg;
>>       unsigned long weight;
>>       int balanced;
>> @@ -4296,32 +4295,22 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
>>               balanced = this_eff_load <= prev_eff_load;
>>       } else
>>               balanced = true;
>> +     schedstat_inc(p, se.statistics.nr_wakeups_affine_attempts);
>>
>> +     if (!balanced)
>> +             return 0;
>>       /*
>>        * If the currently running task will sleep within
>>        * a reasonable amount of time then attract this newly
>>        * woken task:
>>        */
>> +     if (sync)
>>               return 1;
>>
>> +     schedstat_inc(sd, ttwu_move_affine);
>> +     schedstat_inc(p, se.statistics.nr_wakeups_affine);
>>
>> +     return 1;
>>  }
>
> So I'm not usually one for schedstat nitpicking, but should we fix it in
> the sync case? That is, for sync we return 1 but do no inc
> nr_wakeups_affine, even though its going to be an affine wakeup.

ok, i'm going to move schedstat update at the right place

>
>
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