linux-kernel - Re: [PATCH v2 2/2] cpufreq: CPPC: Dont read counters for idle CPUs

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Message-ID: <CAFivqm+kbRbJsJ_Obb4bV6fgxbqAwOndLUCDwHvWWnpMYoNoNw@mail.gmail.com>
Date: Thu, 31 Jul 2025 09:51:51 -0700
From: Prashant Malani <pmalani@...gle.com>
To: Beata Michalska <beata.michalska@....com>
Cc: Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Jie Zhan <zhanjie9@...ilicon.com>, Ionela Voinescu <ionela.voinescu@....com>, 
	Ben Segall <bsegall@...gle.com>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>, 
	open list <linux-kernel@...r.kernel.org>, 
	"open list:CPU FREQUENCY SCALING FRAMEWORK" <linux-pm@...r.kernel.org>, Mel Gorman <mgorman@...e.de>, 
	Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Valentin Schneider <vschneid@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	z00813676 <zhenglifeng1@...wei.com>, sudeep.holla@....com
Subject: Re: [PATCH v2 2/2] cpufreq: CPPC: Dont read counters for idle CPUs

HI Beata,

On Thu, 31 Jul 2025 at 01:27, Beata Michalska <beata.michalska@....com> wrote:
> In the meantime I'm still trying to figure out smht to mitigate the issues with
> the numbers we get from counters after waking up the CPU.

My attempt at that is here: [1]
It's been proposed before, but it's increasing the delay between samples.

[1] https://lore.kernel.org/linux-pm/20250730220812.53098-1-pmalani@google.com/

BR,

-Prashant