The purpose of numa_zonelist_order=zone is to preserve lower zones
for use with 32-bit devices. If locality is preferred then the
numa_zonelist_order=node policy should be used. Unfortunately, the fair
zone allocation policy overrides this by skipping zones on remote nodes
until the lower one is found. While this makes sense from a page aging
and performance perspective, it breaks the expected zonelist policy. This
patch restores the expected behaviour for zone-list ordering.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aa46f00..0bf384a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1957,7 +1957,7 @@ zonelist_scan:
*/
if (alloc_flags & ALLOC_FAIR) {
if (!zone_local(preferred_zone, zone))
- continue;
+ break;
if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0)
continue;
}
--
1.8.4.5
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