linux-kernel - Re: [PATCH v5 08/12] sched: move cfs task on a CPU with higher capacity

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Date:	Thu, 11 Sep 2014 13:20:54 +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>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.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>,
	Dietmar Eggemann <dietmar.eggemann@....com>
Subject: Re: [PATCH v5 08/12] sched: move cfs task on a CPU with higher capacity

On 11 September 2014 12:07, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Aug 26, 2014 at 01:06:51PM +0200, Vincent Guittot wrote:
>
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index 18db43e..60ae1ce 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -6049,6 +6049,14 @@ static bool update_sd_pick_busiest(struct lb_env *env,
>>                       return true;
>>       }
>>
>> +     /*
>> +      * The group capacity is reduced probably because of activity from other
>> +      * sched class or interrupts which use part of the available capacity
>> +      */
>> +     if ((sg->sgc->capacity_orig * 100) > (sgs->group_capacity *
>> +                             env->sd->imbalance_pct))
>> +             return true;
>> +
>>       return false;
>>  }
>
> This is unlikely to have worked as intended. You will never reach this,
> except on PowerPC >= 7. All other machines will have bailed at the
> !ASYM_PACKING check above this.

Ah yes, i miss that change while rebasing on rik patches. My use case
fall in this wider test now that we always select a busiest group
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