linux-kernel - Re: [PATCH v2 5/5] sched: cpu_power: enable ARCH

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Date:	Wed, 20 Jun 2012 11:11:04 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, devicetree-discuss@...ts.ozlabs.org,
	linux@....linux.org.uk, grant.likely@...retlab.ca,
	rob.herring@...xeda.com
Subject: Re: [PATCH v2 5/5] sched: cpu_power: enable ARCH_POWER

On 19 June 2012 11:01, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Tue, Jun 19, 2012 at 10:28:56AM +0200, Vincent Guittot wrote:
>> Heteregeneous ARM platform uses arch_scale_freq_power function
>> to reflect the relative capacity of each core
>>
>> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>> ---
>>  kernel/sched/features.h |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/sched/features.h b/kernel/sched/features.h
>> index de00a48..d98ae90 100644
>> --- a/kernel/sched/features.h
>> +++ b/kernel/sched/features.h
>> @@ -42,7 +42,7 @@ SCHED_FEAT(CACHE_HOT_BUDDY, true)
>>  /*
>>   * Use arch dependent cpu power functions
>>   */
>> -SCHED_FEAT(ARCH_POWER, false)
>> +SCHED_FEAT(ARCH_POWER, true)
>
> Hmmm...seems we can remove this knob completely.
>

Peter,

Do you prefer to keep it or remove it completely ?

Thanks

> __weak arch_scale_smt_power() is doing all the trick.
>
> Thanks,
> Yong
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