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

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Message-ID: <6dad209a-5dd5-546e-a8ad-e8b720955e77@google.com>
Date: Sat, 25 Oct 2025 21:46:44 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: Gregory Price <gourry@...rry.net>
cc: linux-mm@...ck.org, 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, 
    David Hildenbrand <david@...hat.com>, Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH v3] page_alloc: allow migration of smaller hugepages
 during contig_alloc.

On Fri, 24 Oct 2025, 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>

Acked-by: David Rientjes <rientjes@...gle.com>