linux-kernel - Re: [PATCH v2 4/4] sched/fair: Remove sysctl_sched_migration

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Message-ID: <CAKfTPtBoTnwuwekOSgZ3TTrcAb5UPzTMj+N3=1T8sAuUtsqZBA@mail.gmail.com>
Date:   Fri, 15 Oct 2021 19:57:08 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, 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>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [PATCH v2 4/4] sched/fair: Remove sysctl_sched_migration_cost condition

On Fri, 15 Oct 2021 at 19:42, Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Fri, Oct 15, 2021 at 02:46:54PM +0200, Vincent Guittot wrote:
> > With a default value of 500us, sysctl_sched_migration_cost is
> > significanlty higher than the cost of load_balance. Remove the
> > condition and rely on the sd->max_newidle_lb_cost to abort
> > newidle_balance.
> >
> > Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>
> This is separate and not folded in for ease of bisection?

yes ease bisect and ease revert if finally there is a regression