linux-kernel - Re: [PATCH v4 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

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Date:   Tue, 12 May 2020 16:31:26 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v4 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline

On Tue, 12 May 2020, Srikar Dronamraju wrote:

> +#ifdef CONFIG_NUMA
> +	[N_ONLINE] = NODE_MASK_NONE,

Again. Same issue as before. If you do this then you do a global change
for all architectures. You need to put something in the early boot
sequence (in a non architecture specific way) that sets the first node
online by default.

You have fixed the issue in your earlier patches for the powerpc
archicture. What about the other architectures?

Or did I miss something?