When a batch of pages have been freed to the buddy allocator, it is possible that it is enough to push a zone above its watermarks. This patch puts a check in the free path for zone pressure. It's in a common path but for the most part, it should only be checking if a linked list is empty and have minimal performance impact. Signed-off-by: Mel Gorman <mel@xxxxxxxxx> --- mm/page_alloc.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 1383ff9..3c8e8b7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -562,6 +562,9 @@ static void free_pcppages_bulk(struct zone *zone, int count, } while (--count && --batch_free && !list_empty(list)); } spin_unlock(&zone->lock); + + /* A batch of pages have been freed so check zone pressure */ + check_zone_pressure(zone); } static void free_one_page(struct zone *zone, struct page *page, int order, -- 1.6.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>