On 17.07.23 16:31, Ryan Roberts wrote:
In preparation for the introduction of large folios for anonymous memory, we would like to be able to split them when they have unmapped subpages, in order to free those unused pages under memory pressure. So remove the artificial requirement that the large folio needed to be at least PMD-sized. Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx> Reviewed-by: Yu Zhao <yuzhao@xxxxxxxxxx> Reviewed-by: Yin Fengwei <fengwei.yin@xxxxxxxxx> --- mm/rmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/rmap.c b/mm/rmap.c index 0c0d8857dfce..2baf57d65c23 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1430,7 +1430,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma, * page of the folio is unmapped and at least one page * is still mapped. */ - if (folio_test_pmd_mappable(folio) && folio_test_anon(folio)) + if (folio_test_large(folio) && folio_test_anon(folio)) if (!compound || nr < nr_pmdmapped) deferred_split_folio(folio);
!compound will always be true I guess, so nr_pmdmapped == 0 (which will always be the case) will be ignored.
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> -- Cheers, David / dhildenb
