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

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Message-ID: <20250731111324.vv6vsh35enk3gg4h@vireshk-i7>
Date: Thu, 31 Jul 2025 16:43:24 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Beata Michalska <beata.michalska@....com>
Cc: Prashant Malani <pmalani@...gle.com>,
	"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

On 31-07-25, 10:27, Beata Michalska wrote:
> I am still wondering whether cpufreq core is not a better suited place for
> checking whether the CPU is idle. We could potentially try on anther CPU within
> the policy and if there is none, just provide the last known freq ?
> 
> @Viresh: What are your thoughts on that ?

For other platforms (that' don't have counters to read), I think a call to
->get() to get the currently configured frequency is perfectly fine. Isn't it ?

-- 
viresh