linux-kernel - Re: [PATCH 2/3] sched/numa: Allow a floating imbalance between NUMA nodes

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Date:   Tue, 17 Nov 2020 15:16:03 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH 2/3] sched/numa: Allow a floating imbalance between NUMA
 nodes

On Tue, Nov 17, 2020 at 01:42:21PM +0000, Mel Gorman wrote:
> This patch revisits the possibility that NUMA nodes can be imbalanced
> until 25% of the CPUs are occupied. The reasoning behind 25% is somewhat
> superficial -- it's half the cores when HT is enabled.  At higher
> utilisations, balancing should continue as normal and keep things even
> until scheduler domains are fully busy or over utilised.

Do we want to make that shift depend on the actual SMT factor?