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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20201117141603.GM3121392@hirez.programming.kicks-ass.net>
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?