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

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Message-ID: <20201117105337.vjwtig3qxpc6owmw@vireshk-i7>
Date:   Tue, 17 Nov 2020 16:23:37 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Nicola Mazzucato <nicola.mazzucato@....com>
Cc:     Lukasz Luba <lukasz.luba@....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 17-11-20, 10:47, Nicola Mazzucato wrote:
> Freq-invariance has been mentioned. I suppose the fix will depend on which
> strategy we prefer to solve this.

I am not sure how FIE will use this information, as I thought the
problem is about knowing the current frequency on a CPU instead of
which CPUs are related. Anyway, EM is good enough to get this stuff
going.

> As a reminder, two solutions:
> 1) dependent_cpus cpumask in cpufreq and involved entities pick this info

Yeah, this one. And it will be called freqdomain_cpus. Add support for
freqdomain_cpus in core, update acpi-cpufreq to reuse it instead of
adding its own and you can have it in other drivers then.

-- 
viresh