linux-kernel - Re: [GIT PULL] scheduler changes for v5.5

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Message-ID: <CAHk-=wip1A+9X9+ceLFb8y9g=206GsAEB0Sx-H2inzxF1dkFGg@mail.gmail.com>
Date:   Tue, 26 Nov 2019 15:25:16 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mel Gorman <mgorman@...e.de>, Ben Segall <bsegall@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [GIT PULL] scheduler changes for v5.5

On Mon, Nov 25, 2019 at 4:59 AM Ingo Molnar <mingo@...nel.org> wrote:
>
> As such it's not really an iterative series, but replaces the old
> load-balancing logic with the new one. We hope there are no performance
> regressions left - but statistically it's highly probable that there *is*
> going to be some workload that is hurting from these chnages. If so then
> we'd prefer to have a look at that workload and fix its scheduling,
> instead of reverting the changes.

We may not have that opportunity. A lot of loads are various private
loads and you'll just get "this regressed by a huge amount".

So please do keep in mind that reverting this may be the only
reasonable model if it turns out to have bad effects.

               Linus