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Date: Tue, 1 Mar 2016 14:26:47 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Steve Muckle <steve.muckle@...aro.org> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Ingo Molnar <mingo@...hat.com>, "Rafael J. Wysocki" <rafael@...nel.org>, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, Vincent Guittot <vincent.guittot@...aro.org>, Morten Rasmussen <morten.rasmussen@....com>, Dietmar Eggemann <dietmar.eggemann@....com>, Juri Lelli <Juri.Lelli@....com>, Patrick Bellasi <patrick.bellasi@....com>, Michael Turquette <mturquette@...libre.com>, Ricky Liang <jcliang@...omium.org> Subject: Re: [RFCv7 PATCH 03/10] sched: scheduler-driven cpu frequency selection On Fri, Feb 26, 2016 at 08:17:46PM -0800, Steve Muckle wrote: > > But then it would only make a difference if cpufreq_update_util() was not > > used at all (ie. no callbacks installed for any policies by anyone). The > > only reason why it may matter is that the total number of systems using > > the performance governor is quite large AFAICS and they would benefit from > > that. > > I'd think that's a benefit worth preserving, but I guess that's Peter > and Ingo's call. Probably worth it, most of this is on rather fast paths. See commit 1cde2930e154 ("sched/preempt: Add static_key() to preempt_notifiers") for example.
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