linux-kernel - Re: [RFC PATCH v2] page_alloc: allow migration of smaller hugepages during contig

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Message-ID: <8A6112F2-794C-4076-A6DB-F68FACCAAE93@nvidia.com>
Date: Mon, 20 Oct 2025 19:02:14 -0400
From: Zi Yan <ziy@...dia.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,
 David Hildenbrand <david@...hat.com>
Subject: Re: [RFC PATCH v2] page_alloc: allow migration of smaller hugepages
 during contig_alloc.

On 20 Oct 2025, at 17:08, 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 requested allocation.
>
> Compaction `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>
> ---
>  mm/page_alloc.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
>
LGTM. Reviewed-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan, Zi