linux-kernel - Re: [PATCH v6 6/6] sched: add SD_PREFER

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Message-ID: <CAKfTPtCcgzHtNoP3gdsH-AZwoUqp9pUq0EZMsdC0uHYa+w7b4Q@mail.gmail.com>
Date:	Thu, 25 Sep 2014 14:10:50 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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>,
	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>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>
Subject: Re: [PATCH v6 6/6] sched: add SD_PREFER_SIBLING for SMT level

On 24 September 2014 14:27, Preeti U Murthy <preeti@...ux.vnet.ibm.com> wrote:
> On 09/23/2014 09:38 PM, Vincent Guittot wrote:
>> add the SD_PREFER_SIBLING flag for SMT level in order to ensure that
>> the scheduler will put at least 1 task per core.
>>
>> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>> ---
>>  kernel/sched/core.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> index c7c8ac4..f72663e 100644
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -6134,6 +6134,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
>>        */
>>
>>       if (sd->flags & SD_SHARE_CPUCAPACITY) {
>> +             sd->flags |= SD_PREFER_SIBLING;
>>               sd->imbalance_pct = 110;
>>               sd->smt_gain = 1178; /* ~15% */
>>
> Reviewed-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com>

Thanks

>
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