linux-kernel - Re: [PATCH] sched/topology: fix the issue groups don't span domain->span for NUMA diameter

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Date:   Tue, 02 Feb 2021 16:48:23 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     Barry Song <song.bao.hua@...ilicon.com>,
        vincent.guittot@...aro.org, mgorman@...e.de, mingo@...nel.org,
        peterz@...radead.org, dietmar.eggemann@....com,
        morten.rasmussen@....com, linux-kernel@...r.kernel.org
Cc:     linuxarm@...neuler.org, xuwei5@...wei.com, liguozhu@...ilicon.com,
        tiantao6@...ilicon.com, wanghuiqiang@...wei.com,
        prime.zeng@...ilicon.com, jonathan.cameron@...wei.com,
        guodong.xu@...aro.org, Barry Song <song.bao.hua@...ilicon.com>,
        Meelis Roos <mroos@...ux.ee>
Subject: Re: [PATCH] sched/topology: fix the issue groups don't span domain->span for NUMA diameter > 2

On 02/02/21 15:17, Valentin Schneider wrote:
> That is, rather than building overlapping groups and fixing them whenever
> that breaks (distance > 2), we could have:
> - the local group being the child domain's span (as always)
> - all non-local NUMA groups spanning a single node each, with the right sgc
>   cross-referencing.
>
> Thoughts?
>

Hmph I'm thinking this can be broken by domain degeneration, as nothing
will come fix up the ->sgc link and we'd be back to having a reference to a
group that doesn't get updated...