Re: [PATCH v3] page_alloc: allow migration of smaller hugepages during contig_alloc.

[David Rientjes]

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@xxxxxxxxxx>
> Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
> Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>