linux-kernel - Re: [PATCH v2] cpufreq: allow powersave governor as the default without expert mode

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Message-ID: <1463060.7rHn3OIKry@vostro.rjw.lan>
Date:	Thu, 30 Oct 2014 22:18:33 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	James Geboski <jgeboski@...il.com>,
	'Dirk Brandewie' <dirk.j.brandewie@...el.com>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	'Dirk Brandewie' <dirk.brandewie@...il.com>
Subject: Re: [PATCH v2] cpufreq: allow powersave governor as the default without expert mode

On Thursday, October 16, 2014 07:37:11 AM James Geboski wrote:
> The intel_pstate driver only supports the performance and the powersave
> governors. With the performance governor ensuring the highest possible
> performance settings, userspace tools fail to make any lasting changes.
> In order to allow userspace tools to make modifications to the settings,
> the powersave governor must be in use. This makes having the powersave
> governor as the default convenient for systems where the intel_pstate
> driver is being employed. Having to enable expert mode in the kernel
> configuration is just a headache for such a trivial task.
> 
> This patch applies to all kernel versions 2.6.38 or greater after the
> migration from CONFIG_EMBEDDED to CONFIG_EXPERT (6a108a14fa35). Most
> importantly, this applies to kernel versions 3.9 or greater when the
> intel_pstate driver was introduced.
> 
> Signed-off-by: James Geboski <jgeboski@...il.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

Dirk, any objections?

> ---
> ChangeLog v2:
>   - Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/cpufreq/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index 3489f8f..73df7db 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -63,7 +63,6 @@ config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
>  
>  config CPU_FREQ_DEFAULT_GOV_POWERSAVE
>  	bool "powersave"
> -	depends on EXPERT
>  	select CPU_FREQ_GOV_POWERSAVE
>  	help
>  	  Use the CPUFreq governor 'powersave' as default. This sets
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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