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

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Message-ID: <aJ0Q2uEQ03P9Nuf1@google.com>
Date: Wed, 13 Aug 2025 22:25:30 +0000
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 Aug 13 12:15, Beata Michalska wrote:
> Ok, that's not really good.
> Any chances on sharing which platform are you using ?

Unfortunately I can't share that info ATM.
But it's the ARM standard counters in FFH, so it should be reproducible
on any platform that has that configuration for those AMU counters.

> Remote debugging tends to be rather painful.

Totally understand. I really appreciate your patience and help in
figuring this out!

Please LMK if there are any other experiments/patches you'd like me to
try.

BR,

-Prashant