mm: numa: avoid unnecessary disruption of NUMA hinting during migration

[karo-tx-linux.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index a987525810ae3da6aec4b358944b33da80d33366..cfb419085261ce4eba3ab7bb6f55ad9b1ff230f8 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1655,6 +1655,18 @@ int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
        return 1;
 }
 
+bool pmd_trans_migrating(pmd_t pmd)
+{
+       struct page *page = pmd_page(pmd);
+       return PageLocked(page);
+}
+
+void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd)
+{
+       struct page *page = pmd_page(*pmd);
+       wait_on_page_locked(page);
+}
+
 /*
  * Attempt to migrate a misplaced page to the specified destination
  * node. Caller is expected to have an elevated reference count on