linux-kernel - Re: [PATCH] sched, fair: Allow a small load imbalance between low utilisation SD

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Message-ID: <20200117151131.GG14879@hirez.programming.kicks-ass.net>
Date:   Fri, 17 Jan 2020 16:11:31 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Phil Auld <pauld@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Hillf Danton <hdanton@...a.com>,
        Parth Shah <parth@...ux.ibm.com>,
        Rik van Riel <riel@...riel.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched, fair: Allow a small load imbalance between low
 utilisation SD_NUMA domains v4

On Fri, Jan 17, 2020 at 04:09:33PM +0100, Vincent Guittot wrote:
> On Tue, 14 Jan 2020 at 11:13, Mel Gorman <mgorman@...hsingularity.net> wrote:

> > In general, the patch simply seeks to avoid unnecessary cross-node
> > migrations in the basic case where imbalances are very small.  For low
> > utilisation communicating workloads, this patch generally behaves better
> > with less NUMA balancing activity. For high utilisation, there is no
> > change in behaviour.
> >
> > Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> 
> Reviewed-by: Vincent Guittot <vincent.guittot@...aro.org>

Thanks all!