linux-kernel - Re: [PATCH V3 1/2] topology: Allow multiple entities to provide sched_freq

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Message-ID: <20210218072346.5lvymba35ezuz2do@vireshk-i7>
Date:   Thu, 18 Feb 2021 12:53:46 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     Rafael Wysocki <rjw@...ysocki.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH V3 1/2] topology: Allow multiple entities to provide
 sched_freq_tick() callback

On 17-02-21, 11:57, Ionela Voinescu wrote:
> See a very useful comment someone added recently :) :
> 
> """
> +	/*
> +	 * We don't need to handle CPUFREQ_REMOVE_POLICY event as the AMU
> +	 * counters don't have any dependency on cpufreq driver once we have
> +	 * initialized AMU support and enabled invariance. The AMU counters will
> +	 * keep on working just fine in the absence of the cpufreq driver, and
> +	 * for the CPUs for which there are no counters available, the last set
> +	 * value of freq_scale will remain valid as that is the frequency those
> +	 * CPUs are running at.
> +	 */
> """

Lol... 

-- 
viresh