Commit 89a41a02 authored by David Hildenbrand's avatar David Hildenbrand Committed by Andrew Morton
Browse files

mm/hugetlb: use folio->lru int demote_free_hugetlb_folios() 

We are demoting hugetlb folios to smaller hugetlb folios; let's avoid
messing with pages where avoidable and handle it more similar to
__split_huge_page_tail().

Link: https://lkml.kernel.org/r/20250113131611.2554758-7-david@redhat.com


Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarSidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3f982b9b

mm/hugetlb.c

+5 −3
Original line number Diff line number Diff line
@@ -3826,13 +3826,15 @@ static long demote_free_hugetlb_folios(struct hstate *src, struct hstate *dst, 


		for (i = 0; i < pages_per_huge_page(src); i += pages_per_huge_page(dst)) {

			struct page *page = folio_page(folio, i);

			/* Careful: see __split_huge_page_tail() */

			struct folio *new_folio = (struct folio *)page;



			page->mapping = NULL;

			clear_compound_head(page);

			prep_compound_page(page, dst->order);



			init_new_hugetlb_folio(dst, page_folio(page));

			list_add(&page->lru, &dst_list);

			new_folio->mapping = NULL;

			init_new_hugetlb_folio(dst, new_folio);

			list_add(&new_folio->lru, &dst_list);

		}

	}