linux-kernel - Re: [PATCH 2/2] sched/topology: Expose numa

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Message-ID: <20180831120820.GN24124@hirez.programming.kicks-ass.net>
Date:   Fri, 31 Aug 2018 14:08:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Benjamin Herrenschmidt <benh@....ibm.com>
Subject: Re: [PATCH 2/2] sched/topology: Expose numa_mask set/clear functions
 to arch

On Fri, Aug 31, 2018 at 04:53:50AM -0700, Srikar Dronamraju wrote:

> The topology events are suppose to be very rare.
> From whatever small experiments I have done till now, unless tasks are
> bound to both cpu and memory, they seem to be coping well with topology
> updates.

IOW, if you're not using NUMA, it works if you change the NUMA setup.

You don't see anything wrong with that?!

Those programs would work as well if you didn't expose the NUMA stuff,
because they're not using it anyway.