linux-kernel - Re: [PATCH V2 00/17] thermal: cpu_cooling: improve interaction with cpufreq core

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Date:   Mon, 17 Apr 2017 10:34:34 -0700
From:   Eduardo Valentin <edubezval@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        linaro-kernel@...ts.linaro.org,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Rafael Wysocki <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH V2 00/17] thermal: cpu_cooling: improve interaction with
 cpufreq core

Hey,

On Mon, Apr 17, 2017 at 11:31:45AM +0530, Viresh Kumar wrote:
> Hi Guys,
> 
> The cpu_cooling driver is designed to use CPU frequency scaling to avoid
> high thermal states for a platform. But it wasn't glued really well with
> cpufreq core.
> 
> This series tries to improve interactions between cpufreq core and
> cpu_cooling driver and does some fixes/cleanups to the cpu_cooling
> driver.

Can you please be more specific of what exactly is not gluing
properly/really well? I like refactoring, as long as well justified.

Do you see anything broken currently?

Or is it more of a optimization in terms of data structures and how
things are computed?

> 
> I have tested it on ARM 32 (exynos) and 64 bit (hikey) boards and have
> pushed them for 0-day build bot and kernel CI testing as well. We should
> know if something is broken with these.

Nice. What governors did you try? Have you checked "power_allocator" by
any chance?

> 
> @Javi: It would be good if you can give them a test, specially because
> of your work on the "power" specific bits in the driver.
> 

@Javi, are you still around? This needs to be validated in terms of how
the cdev states and power models are computed. Just to make sure we are
in one piece. Copying the ARM folks too, Punit?.

I will see if I have some time later this week to check if IPA is in one
piece after this series.

> Pushed here as well:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git thermal/cooling
> 
> V1->V2:
> - Name cpufreq cooling dev as cpufreq_cdev everywhere (Eduardo).

That was just very minor stuff. Overall, I do not see major issues, but
I want to spend some more time on this before acking on my side. 

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