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

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Message-ID: <20120619090110.GA1692@zhy>
Date:	Tue, 19 Jun 2012 17:01:11 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
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, a.p.zijlstra@...llo.nl,
	grant.likely@...retlab.ca, rob.herring@...xeda.com
Subject: Re: [PATCH v2 5/5] sched: cpu_power: enable ARCH_POWER

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.

__weak arch_scale_smt_power() is doing all the trick.

Thanks,
Yong
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