linux-kernel - Re: [RFC PATCH v2 5/5] sched/fair: Simplify ancestor enqueue loops

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Date:   Fri, 10 Sep 2021 13:43:39 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Phil Auld <pauld@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Odin Ugedal <odin@...d.al>, Rik van Riel <riel@...riel.com>,
        Giovanni Gherdovich <ggherdovich@...e.cz>
Subject: Re: [RFC PATCH v2 5/5] sched/fair: Simplify ancestor enqueue loops

On Fri, 10 Sept 2021 at 13:35, Michal Koutný <mkoutny@...e.com> wrote:
>
> On Thu, Sep 09, 2021 at 04:04:02PM +0200, Vincent Guittot <vincent.guittot@...aro.org> wrote:
> > These multiple break loops have been done to make unthrottle_cfs_rq,
> > throttle_cfs_rq, enqueue_task_fair and dequeue_task_fair to follow the
> > same pattern
>
> Ah, I watched only the unthrottle_cfs_rq and enqueue_task_fair pair and
> missed the consistency with the other two.
>
> > and I don't see any good reason to break this
>
> Isn't this a good reason
> >  21 insertions(+), 36 deletions(-)
> ?

Not if it make the code less readable and I prefer the current implementation

>
> (The stats are with a grain of salt, I'd need to recheck how these stats
> would hold if throttle_cfs_rq, dequeue_task_fair would be modified too +
> they look a bit better because of the loop from 1/5.)
>
> Michal