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Commit f7b5d647 authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
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mm: page_alloc: abort fair zone allocation policy when remotes nodes are encountered 



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: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bb0b6dff

mm/page_alloc.c

+1 −1
Original line number Diff line number Diff line
@@ -1965,7 +1965,7 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order, 
		 */

		if (alloc_flags & ALLOC_FAIR) {

			if (!zone_local(preferred_zone, zone))

				continue;

				break;

			if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0)

				continue;

		}