From 728be28fae8c838d52c91dce4867133798146357 Mon Sep 17 00:00:00 2001 From: Kefeng Wang Date: Wed, 13 Sep 2023 17:51:25 +0800 Subject: [PATCH] mm: migrate: remove THP mapcount check in numamigrate_isolate_page() The check of THP mapped by multiple processes was introduced by commit 04fa5d6a6547 ("mm: migrate: check page_count of THP before migrating") and refactor by commit 340ef3902cf2 ("mm: numa: cleanup flow of transhuge page migration"), which is out of date, since migrate_misplaced_page() is now using the standard migrate_pages() for small pages and THPs, the reference count checking is in folio_migrate_mapping(), so let's remove the special check for THP. Link: https://lkml.kernel.org/r/20230913095131.2426871-3-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Suggested-by: Matthew Wilcox (Oracle) Reviewed-by: "Huang, Ying" Cc: David Hildenbrand Cc: Hugh Dickins Cc: Mike Kravetz Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/migrate.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index d1b8ab5a24171..0030703204d3e 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2486,10 +2486,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) int nr_pages = thp_nr_pages(page); int order = compound_order(page); - /* Do not migrate THP mapped by multiple processes */ - if (PageTransHuge(page) && total_mapcount(page) > 1) - return 0; - /* Avoid migrating to a node that is nearly full */ if (!migrate_balanced_pgdat(pgdat, nr_pages)) { int z; -- 2.49.0