page_alloc: break early in check_for_regular_memory()

If there is a zone below ZONE_NORMAL has present_pages, we can set node state to N_NORMAL_MEMORY, no need to loop to end. Signed-off-by: Bob Liu <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Johannes Weiner <[email protected]> Acked-by: KAMEZAWA Hiroyuki <[email protected]> Cc: KOSAKI Motohiro <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kishon · Jan 13, 2012 · d0048b0 · d0048b0
1 parent 3ed28fa
commit d0048b0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
@@ -4642,8 +4642,10 @@ static void check_for_regular_memory(pg_data_t *pgdat)
 
 	for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) {
 		struct zone *zone = &pgdat->node_zones[zone_type];
-		if (zone->present_pages)
+		if (zone->present_pages) {
 			node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY);
+			break;
+		}
 	}
 #endif
 }