linux-kernel - Re: [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test

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Message-ID: <aW-RDkr-KQ5pkFAX@localhost.localdomain>
Date: Tue, 20 Jan 2026 15:28:30 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	"Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Ben Segall <bsegall@...gle.com>, Boqun Feng <boqun.feng@...il.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Heiko Carstens <hca@...ux.ibm.com>, Ingo Molnar <mingo@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Kieran Bingham <kbingham@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Mel Gorman <mgorman@...e.de>, Michael Ellerman <mpe@...erman.id.au>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Nicholas Piggin <npiggin@...il.com>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven Schnelle <svens@...ux.ibm.com>,
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	Uladzislau Rezki <urezki@...il.com>,
	Valentin Schneider <vschneid@...hat.com>,
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	Vincent Guittot <vincent.guittot@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Xin Zhao <jackzxcui1989@....com>, linux-pm@...r.kernel.org,
	linux-s390@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime
 granularity test

Le Tue, Jan 20, 2026 at 01:32:50PM +0100, Rafael J. Wysocki a écrit :
> On Mon, Jan 19, 2026 at 11:07 PM Frederic Weisbecker
> <frederic@...nel.org> wrote:
> >
> > Le Mon, Jan 19, 2026 at 01:30:07PM +0100, Rafael J. Wysocki a écrit :
> > > On Fri, Jan 16, 2026 at 3:53 PM Frederic Weisbecker <frederic@...nel.org> wrote:
> > > >
> > > > cpufreq calls get_cpu_idle_time_us() just to know if idle cputime
> > > > accounting has a nanoseconds granularity.
> > > >
> > > > Use the appropriate indicator instead to make that deduction.
> > > >
> > > > Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> > >
> > > Acked-by: Rafael J. Wysocki (Intel) <rafael@...nel.org>
> > >
> > > or please let me know if you want me to take this patch.
> >
> > The patch is standalone but the rest of the patchset depends on it.
> > Now I don't target this patchset for v6.20-rc1.
> >
> > So if you manage to sneak this patch in for v6.20-rc1, it works because
> > I'll rebase on -rc1. Otherwise I'll need to keep it to avoid breaking
> > some code assumptions.
> >
> > What do you think?
> 
> It can go into -rc1.

Very nice, thanks for taking it!


-- 
Frederic Weisbecker
SUSE Labs