[PATCH 6/6] mm: migrate: remove redundant page count check for THP
From: Yang Shi <hidden>
Date: 2021-03-29 18:34:32
Also in:
linux-s390, lkml
Subsystem:
memory management, memory management - memory policy and migration, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Don't have to keep the redundant page count check for THP anymore after switching to use generic migration code. Signed-off-by: Yang Shi <redacted> --- mm/migrate.c | 12 ------------ 1 file changed, 12 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 1c0c873375ab..328f76848d6c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c@@ -2097,18 +2097,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) if (isolate_lru_page(page)) return 0; - /* - * migrate_misplaced_transhuge_page() skips page migration's usual - * check on page_count(), so we must do it here, now that the page - * has been isolated: a GUP pin, or any other pin, prevents migration. - * The expected page count is 3: 1 for page's mapcount and 1 for the - * caller's pin and 1 for the reference taken by isolate_lru_page(). - */ - if (PageTransHuge(page) && page_count(page) != 3) { - putback_lru_page(page); - return 0; - } - page_lru = page_is_file_lru(page); mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru, thp_nr_pages(page));
--
2.26.2