linux-kernel - Re: [PATCH v2 1/2] cpufreq_stats: Adds sysfs file /sys/devices/system/cpu/cpufreq/current_in

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Message-ID: <20150515024843.GE6348@linux>
Date:	Fri, 15 May 2015 08:18:43 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Ruchi Kandoi <kandoiruchi@...gle.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Heinrich Schuchardt <xypron.glpk@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Kees Cook <keescook@...omium.org>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Davidlohr Bueso <dave@...olabs.net>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] cpufreq_stats: Adds sysfs file
 /sys/devices/system/cpu/cpufreq/current_in_state

I am not replying for concept here, as sched maintainers are in a
better position for that, but a nit below..

On 14-05-15, 17:12, Ruchi Kandoi wrote:
> Adds the sysfs file for userspace to initialize the active current
> values for all the cores at each of the frequencies.
> 
> The format for storing the values is as follows:
> echo "CPU<cpu#>:<freq1>=<current in uA> <freq2>=<current>,CPU<cpu#>:
> ..." > /sys/devices/system/cpu/cpufreq/current_in_state

Why this file? And not
/sys/devices/system/cpu/cpuX/cpufreq/stats/current_in_state ? That way
you don't have to replicate the same information for all CPUs, as the
stats folder can be shared by multiple CPUs (which share their
clock/voltage rails)..

-- 
viresh
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