linux-kernel - Re: [PATCH V9] powercap/drivers/idle_injection: Add an idle injection framework

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Date:   Mon, 25 Jun 2018 00:40:15 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rjw@...ysocki.net
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        linux-kernel@...r.kernel.org,
        Eduardo Valentin <edubezval@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Kevin Wangtao <kevin.wangtao@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rui Zhang <rui.zhang@...el.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        "open list:POWER MANAGEMENT CORE" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH V9] powercap/drivers/idle_injection: Add an idle injection
 framework


Hi Rafael,

do you think this patch is acceptable for merging ?



On 20/06/2018 06:34, Viresh Kumar wrote:
> On 19-06-18, 15:23, Daniel Lezcano wrote:
>> Initially, the cpu_cooling device for ARM was changed by adding a new
>> policy inserting idle cycles. The intel_powerclamp driver does a
>> similar action.
>>
>> Instead of implementing idle injections privately in the cpu_cooling
>> device, move the idle injection code in a dedicated framework and give
>> the opportunity to other frameworks to make use of it.
>>
>> The framework relies on the smpboot kthreads which handles via its
>> main loop the common code for hotplugging and [un]parking.
>>
>> This code was previously tested with the cpu cooling device and went
>> through several iterations. It results now in split code and API
>> exported in the header file. It was tested with the cpu cooling device
>> with success.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> Cc: Viresh Kumar <viresh.kumar@...aro.org>
>> Cc: Eduardo Valentin <edubezval@...il.com>
>> Cc: Javi Merino <javi.merino@...nel.org>
>> Cc: Leo Yan <leo.yan@...aro.org>
>> Cc: Kevin Wangtao <kevin.wangtao@...aro.org>
>> Cc: Vincent Guittot <vincent.guittot@...aro.org>
>> Cc: Rui Zhang <rui.zhang@...el.com>
>> Cc: Daniel Thompson <daniel.thompson@...aro.org>
>> Cc: Peter Zijlstra <peterz@...radead.org>
>> Cc: Andrea Parri <andrea.parri@...rulasolutions.com>
>> ---
>>
>> V9:
>>    - Unconditionnally reset the should_run flag for all kthreads
>>      belonging to the cpumask and remove the park() callback (Viresh Kumar)
>>    - Fix up the typos in the comments (Viresh Kumar)
> 
> Looks great now. Can't think of any more races :)
> 
> Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>
> 


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