linux-kernel - Re: [PATCH v3] page_alloc: allow migration of smaller hugepages during contig

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Message-ID: <2de17512-3df3-4ee4-9912-8a8f7ca5b648@redhat.com>
Date: Mon, 27 Oct 2025 16:43:25 +0100
From: David Hildenbrand <david@...hat.com>
To: Gregory Price <gourry@...rry.net>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
 akpm@...ux-foundation.org, vbabka@...e.cz, surenb@...gle.com,
 mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com,
 Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH v3] page_alloc: allow migration of smaller hugepages
 during contig_alloc.

On 24.10.25 21:28, Gregory Price wrote:
> We presently skip regions with hugepages entirely when trying to do
> contiguous page allocation.  Instead, if hugepage migration is enabled,
> consider regions with hugepages smaller than the target contiguous
> allocation request as valid targets for allocation.
> 
> isolate_migrate_pages_block() already expects requests with hugepages
> to originate from alloc_contig, and hugetlb code also does a migratable
> check when isolating in folio_isolate_hugetlb().
> 
> Suggested-by: David Hildenbrand <david@...hat.com>
> Signed-off-by: Gregory Price <gourry@...rry.net>
> Reviewed-by: Zi Yan <ziy@...dia.com>
> Reviewed-by: Wei Yang <richard.weiyang@...il.com>
> ---

Nit: trailing "." in subject

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb