From: Kefeng Wang <wangkefeng.wang@huawei.com> mainline inclusion from mainline-v6.7-rc1 commit 728be28fae8c838d52c91dce4867133798146357 category: other bugzilla: https://gitee.com/openeuler/kernel/issues/I8JQWQ Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- 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before migrating") and refactor by commit 340ef3902cf2 ("mm: numa: cleanup flow of transhuge page migration"), which is out of date, since migrate_misplaced_page() is now using the standard migrate_pages() for small pages and THPs, the reference count checking is in folio_migrate_mapping(),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.co... Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: "Huang, Ying" <ying.huang@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: ZhangPeng <zhangpeng362@huawei.com> --- mm/migrate.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index d19885a0f908..43a780057999 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2496,10 +2496,6 @@ 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; -- 2.25.1