linux-kernel - Re: [PATCH v3 3/3] [RFC] CPUFreq: Add support for cpu-perf-dependencies

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Message-ID: <20201109065742.22czfgyjhsjmkytf@vireshk-i7>
Date:   Mon, 9 Nov 2020 12:27:42 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Nicola Mazzucato <nicola.mazzucato@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        sudeep.holla@....com, rjw@...ysocki.net, vireshk@...nel.org,
        robh+dt@...nel.org, sboyd@...nel.org, nm@...com,
        daniel.lezcano@...aro.org, morten.rasmussen@....com,
        chris.redpath@....com
Subject: Re: [PATCH v3 3/3] [RFC] CPUFreq: Add support for
 cpu-perf-dependencies

On 06-11-20, 11:14, Lukasz Luba wrote:
> I also had similar doubts, because if we make frequency requests
> independently for each CPU, why not having N cooling devs, which
> will set independently QoS max freq for them...
> 
> What convinced me:
> EAS and FIE would know the 'real' frequency of the cluster, IPA
> can use it also and have only one cooling device per cluster.
> 
> We would like to keep this old style 'one cooling device per cpuset'.
> I don't have strong opinion and if it would appear that there are
> some errors in freq estimation for cluster, then maybe it does make
> more sense to have cdev per CPU...

Let me rephrase my question. What is it that doesn't work _correctly_
with cdev per cpufreq policy in your case? What doesn't work well if
the thermal stuff keeps looking at only the related_cpus thing and not
the cpu-perf-dependencies thing?

-- 
viresh