linux-kernel - Re: [PATCH RFC 4/5] sched/fair: Correct obsolete comment about cpufreq_update

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Date:   Mon, 30 Oct 2017 14:52:48 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Cc: Srinivas Pandruvada" <srinivas.pandruvada@...ux.intel.com>,
        "Cc: Len Brown" <lenb@...nel.org>,
        "Cc: Juri Lelli" <juri.lelli@....com>,
        "Cc: Patrick Bellasi" <patrick.bellasi@....com>,
        "Cc: Steve Muckle" <smuckle@...gle.com>,
        "Cc: Brendan Jackman" <brendan.jackman@....com>,
        "Cc: Chris Redpath" <Chris.Redpath@....com>,
        "Cc: Atish Patra" <atish.patra@...cle.com>,
        "Cc: Dietmar Eggemann" <dietmar.eggemann@....com>,
        "Cc: Vincent Guittot" <vincent.guittot@...aro.org>,
        "Cc: Morten Ramussen" <morten.rasmussen@....com>,
        "Cc: Frederic Weisbecker" <fweisbec@...il.com>,
        "Cc: Thomas Gleixner" <tglx@...utronix.de>,
        "Cc: EAS Dev" <eas-dev@...ts.linaro.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH RFC 4/5] sched/fair: Correct obsolete comment about
 cpufreq_update_util

You have prefixed most of the Cc'd names with "Cc: " somehow :)

On 28-10-17, 02:59, 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.

We normally keep the column width as 72 in commit logs instead of 80,
as with 'git log' this is indented by a tab and then we would cross 80
columns.

> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Joel Fernandes <joelaf@...gle.com>
> ---
>  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 4c06e52935d3..5c49fdb4c508 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3018,9 +3018,7 @@ 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

Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh