linux-kernel - Re: [PATCH v2] cpufreq: stats: Add 'load_table' debugfs file to show accumulated data of CPUs

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Date:	Mon, 24 Jun 2013 20:18:50 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>
Subject: Re: [PATCH v2] cpufreq: stats: Add 'load_table' debugfs file to show
 accumulated data of CPUs

On 06/24/2013 08:00 PM, Rafael J. Wysocki wrote:
> On Monday, June 24, 2013 04:03:15 PM Viresh Kumar wrote:
>> On 24 June 2013 15:50, Rafael J. Wysocki <rjw@...k.pl> wrote:
>>> My impression was that that new interface wouldn't be useful on all platforms
>>> supported by cpufreq.  If that's the case, I'd rather not make changes in the
>>> core code that are needed only to implement that new interface, at least to
>>> start with.
>>
>> Every platform might not have userspace software that would do some
>> actions based on this. But, these are nice and useful stats to have.
>>
>> They tell you a lot about how the hardware/governor/policies are
>> behaving with load. And so will eventually help getting performance based
>> on governor tunables for your platform. That's why I asked to put this in
>> core as this should be pretty much useful.
> 
> OK, let's see how the code will look like.
> 
> Chanwoo, please prepare a v4 with the changes suggested by Viresh.
> 

@Viresh,
I implement v3 patch for load_table debugfs file. As you suggested, v3 pach include
old/new frequency data. But, I don't add additional function to minimize dependency
among cpufreq core functions. And then I use CPUFREQ_LOADCHECK and CPUFREQ_POSTCHANGE
notification to collect cpu data(time, old/new frequency, CPUs load).

Please review v3 patch for load_table debugfs file. Thanks.

Best Regards,
Chanwoo Choi

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