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

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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: David Hildenbrand <david@redhat.com>
Reviewed-by: Sidhartha 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2025-01-13 14:16:11 +01:00 committed by Andrew Morton
parent 3f982b9b18
commit 89a41a0263
1 changed files with 5 additions and 3 deletions
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8
mm/hugetlb.c
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@ -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);
}
}