Commit f7b5d647 authored Aug 06, 2014 by Mel Gorman Committed by Linus Torvalds Aug 06, 2014

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: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus 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 @@ 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;
		}

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