linux-kernel - Re: [PATCH] PM / EM: Inefficient OPPs detection

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Message-ID: <YHhfCr+7KztYpIkD@google.com>
Date:   Thu, 15 Apr 2021 15:43:06 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Vincent Donnefort <vincent.donnefort@....com>,
        peterz@...radead.org, rjw@...ysocki.net, viresh.kumar@...aro.org,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        ionela.voinescu@....com, dietmar.eggemann@....com
Subject: Re: [PATCH] PM / EM: Inefficient OPPs detection

On Thursday 15 Apr 2021 at 16:32:31 (+0100), Lukasz Luba wrote:
> Are you sure that the 'policy' can be accessed from compute_energy()?
> It can be from schedutil freq switch path, but I'm not use about our
> feec()..

Right, I was just looking at cpufreq_cpu_get() and we'll have locking
issue in the wake-up path :/ So maybe making feec() aware of policy caps
is for later ...

> For me this cpufreq_driver_resolve_freq sounds a bit out of this patch
> subject.

Not sure I agree -- if we're going to index the EM table from schedutil
it should be integrated nicely if possible.

Thanks