linux-kernel - Re: [PATCH 2/2] mm, slab: support NUMA policy for large kmalloc

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Message-ID: <e391fe8a-6bef-4067-86d8-b75ece441b75@gentwo.org>
Date: Thu, 29 May 2025 07:57:24 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Vlastimil Babka <vbabka@...e.cz>
cc: David Rientjes <rientjes@...gle.com>, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    Roman Gushchin <roman.gushchin@...ux.dev>, 
    Harry Yoo <harry.yoo@...cle.com>, Matthew Wilcox <willy@...radead.org>, 
    linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm, slab: support NUMA policy for large kmalloc

On Thu, 29 May 2025, Vlastimil Babka wrote:

> The slab allocator observes the task's numa policy in various places
> such as allocating slab pages. Large kmalloc allocations currently do
> not, which seems to be an unintended omission. It is simple to correct
> that, so make ___kmalloc_large_node() behave the same way as
> alloc_slab_page().

Large kmalloc allocation lead to the use of the page allocator which
implements the NUMA policies for the allocations.

This patch is not necessary.