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: <CAL8qYTO3uurrxQBjfPDNL2hamxh4+GCuzX0mxsEw=+go5CPWcQ@mail.gmail.com>
Date:	Fri, 15 May 2015 17:55:13 -0700
From:	Ruchi Kandoi <kandoiruchi@...gle.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
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

On Thu, May 14, 2015 at 7:48 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> 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)..

Some of the hand-held devices support hot-plugging of the cpus and
when the core is hot-plugged out the
/sys/devices/system/cpu/cpuX/cpufreq directory is removed too. So it
won't be possible to share folders by multiple CPUs.

>
> --
> viresh
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