If we have to avoid migrating to a node that is nearly full, put page
and return zero.
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
mm/migrate.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index a2c4567..49878d7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1489,18 +1489,21 @@ int migrate_misplaced_page(struct page *page, int node)
}
isolated = 1;
- /*
- * Page is isolated which takes a reference count so now the
- * callers reference can be safely dropped without the page
- * disappearing underneath us during migration
- */
- put_page(page);
-
page_lru = page_is_file_cache(page);
inc_zone_page_state(page, NR_ISOLATED_ANON + page_lru);
list_add(&page->lru, &migratepages);
}
+ /*
+ * Page is either isolated or there is not enough space on the target
+ * node. If isolated, then it has taken a reference count and the
+ * callers reference can be safely dropped without the page
+ * disappearing underneath us during migration. Otherwise the page is
+ * not to be migrated but the callers reference should still be
+ * dropped so it does not leak.
+ */
+ put_page(page);
+
if (isolated) {
int nr_remaining;
--
1.7.9.2
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