linux-kernel - Re: [PATCH v3 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

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Message-ID: <alpine.DEB.2.21.2005022304190.28355@www.lameter.com>
Date:   Sat, 2 May 2020 23:05:28 +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>
Subject: Re: [PATCH v3 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline

On Fri, 1 May 2020, Srikar Dronamraju wrote:

> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -116,8 +116,10 @@ EXPORT_SYMBOL(latent_entropy);
>   */
>  nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
>  	[N_POSSIBLE] = NODE_MASK_ALL,
> +#ifdef CONFIG_NUMA
> +	[N_ONLINE] = NODE_MASK_NONE,

Hmmm.... I would have expected that you would have added something early
in boot that would mark the current node (whatever is is) online instead?