linux-kernel - [PATCH v2 0/2] cpufreq: CPPC: idle cpu perf handling

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Message-ID: <20250619000925.415528-1-pmalani@google.com>
Date: Thu, 19 Jun 2025 00:09:15 +0000
From: Prashant Malani <pmalani@...gle.com>
To: 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>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Valentin Schneider <vschneid@...hat.com>, 
	Vincent Guittot <vincent.guittot@...aro.org>, Viresh Kumar <viresh.kumar@...aro.org>
Cc: Prashant Malani <pmalani@...gle.com>
Subject: [PATCH v2 0/2] cpufreq: CPPC: idle cpu perf handling

This is a short series to address the unreliable feedback performance
counter values that are returned by the CPPC driver when the CPU is
idle.

The first patch exposes idle_cpu() to be accessible to modules, and the
second patch does the actual change of not reading the feedback counters
when we know that the CPU is idle.

v1(single patch): https://lore.kernel.org/all/20250614003601.1600784-1-pmalani@google.com/

Prashant Malani (2):
  sched: Expose idle_cpu() to modules
  cpufreq: CPPC: Dont read counters for idle CPUs

 drivers/cpufreq/cppc_cpufreq.c | 5 +++++
 kernel/sched/syscalls.c        | 1 +
 2 files changed, 6 insertions(+)

-- 
2.50.0.rc2.701.gf1e915cc24-goog