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mm: page_alloc: abort fair zone allocation policy when remotes nodes are encountered

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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>
This commit is contained in:
Mel Gorman 2014-08-06 16:07:20 -07:00 committed by Linus Torvalds
parent bb0b6dffa2
commit f7b5d64794
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -1965,7 +1965,7 @@ zonelist_scan:
*/ */
if (alloc_flags & ALLOC_FAIR) { if (alloc_flags & ALLOC_FAIR) {
if (!zone_local(preferred_zone, zone)) if (!zone_local(preferred_zone, zone))
continue; break;
if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0) if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0)
continue; continue;
} }