Re: [PATCH v2] cpufreq: stats: Add 'load_table' debugfs file to showaccumulated data of CPUs

From: Chanwoo Choi
Date: Fri Jun 21 2013 - 00:01:41 EST

On 06/21/2013 12:42 AM, Viresh Kumar wrote:
> On 20 June 2013 16:48, Chanwoo Choi <cw00.choi@xxxxxxxxxxx> wrote:
>> But,
>> To show old frequency/new frequency on load_table debugfs file,
>> governor function(dbs_check_cpu()) pass calculated CPUs load to specific governor(e.g., ondemand)
>> as below function flow.
>> dbs_check_cpu() (in cpufreq.c)
>> -> od_check_cpu() (in cpufreq_ondemand.c)
>> -> __cpufreq_driver_target() (in cpufreq.c)
>> -> cpufreq_driver->target(policy)
>> Also, The __cpufreq_driver_target() is external function which can be called on other file
>> so I must consider exception case.
>> If send CPUFREQ_LOADCHECK noti after changed cpu frequency,
>> I think it is complicated and has quite a little difficulty.
>> What is your opinion?
> What you can do is:
> - create another routine: cpufreq_governor_driver_target()
> - replace all __cpufreq_driver_target() from ondemand/conservative governors
> with this one
> - In cpufreq_governor_driver_target() call __cpufreq_driver_target() and
> take a note of new freq.
> Maybe you don't need to check the actual freq that is set (even
> that would be simple to implement), but what is requested.

OK, I understand and will try to implement it.

If possible, I want to know the your opinion about this.

Best Regards,
Chanwoo Choi

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