linux-kernel - Re: [PATCH 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

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Date:   Sun, 15 Mar 2020 14:20:05 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline

On Wed, 11 Mar 2020, Srikar Dronamraju wrote:

> Currently Linux kernel with CONFIG_NUMA on a system with multiple
> possible nodes, marks node 0 as online at boot.  However in practice,
> there are systems which have node 0 as memoryless and cpuless.

Would it not be better and simpler to require that node 0 always has
memory (and processors)? A  mininum operational set?

We can dynamically number the nodes right? So just make sure that the
firmware properly creates memory on node 0?