[patch for-3.7] mm, numa: avoid setting zone_reclaim_mode unless anode is sufficiently distant

From: David Rientjes
Date: Tue Oct 23 2012 - 21:55:45 EST

Commit 957f822a0ab9 ("mm, numa: reclaim from all nodes within reclaim
distance") caused zone_reclaim_mode to be set for all systems where two
nodes are within RECLAIM_DISTANCE of each other. This is the opposite of
what we actually want: zone_reclaim_mode should be set if two nodes are
sufficiently distant.

Reported-by: Julian Wollrath <jwollrath@xxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
mm/page_alloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1809,10 +1809,10 @@ static void __paginginit init_zone_allows_reclaim(int nid)
int i;

- if (node_distance(nid, i) <= RECLAIM_DISTANCE) {
+ if (node_distance(nid, i) <= RECLAIM_DISTANCE)
node_set(i, NODE_DATA(nid)->reclaim_nodes);
+ else
zone_reclaim_mode = 1;
- }

#else /* CONFIG_NUMA */
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