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

commit f7b5d64794 upstream.

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>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mel Gorman 2014-08-28 19:35:44 +01:00 committed by Greg Kroah-Hartman
parent 442ae03a52
commit a54cf1b321
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -1980,7 +1980,7 @@ zonelist_scan:
*/
if (alloc_flags & ALLOC_FAIR) {
if (!zone_local(preferred_zone, zone))
continue;
break;
if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0)
continue;
}