linux-kernel - Re: [PATCH 2/3] sched/fair: Correct obsolete comment about cpufreq_update

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Date:   Tue, 19 Dec 2017 19:02:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@....com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Chris Redpath <Chris.Redpath@....com>,
        Steve Muckle <smuckle@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Ramussen <morten.rasmussen@....com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Saravana Kannan <skannan@...cinc.com>,
        Vikram Mulukutla <markivx@...eaurora.org>,
        Rohit Jain <rohit.k.jain@...cle.com>,
        Atish Patra <atish.patra@...cle.com>,
        Josef Bacik <jbacik@...com>,
        EAS Dev <eas-dev@...ts.linaro.org>,
        Android Kernel <kernel-team@...roid.com>
Subject: Re: [PATCH 2/3] sched/fair: Correct obsolete comment about
 cpufreq_update_util

On Fri, Dec 15, 2017 at 07:39:43AM -0800, Joel Fernandes wrote:
> Since the remote cpufreq callback work, the cpufreq_update_util call can happen
> from remote CPUs. The comment about local CPUs is thus obsolete. Update it
> accordingly.
> 
> Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Joel Fernandes <joelaf@...gle.com>

Sure, ACK

> ---
>  kernel/sched/fair.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 2fe3aa853e4d..1b10821d8380 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3020,9 +3020,7 @@ static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
>  		/*
>  		 * There are a few boundary cases this might miss but it should
>  		 * get called often enough that that should (hopefully) not be
> -		 * a real problem -- added to that it only calls on the local
> -		 * CPU, so if we enqueue remotely we'll miss an update, but
> -		 * the next tick/schedule should update.
> +		 * a real problem.
>  		 *
>  		 * It will not get called when we go idle, because the idle
>  		 * thread is a different class (!fair), nor will the utilization
> -- 
> 2.15.1.504.g5279b80103-goog
>