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authorBo Liu <bo-liu@hotmail.com>2009-08-18 17:11:19 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-08-18 19:31:13 -0400
commit7f9cfb31030737a7fc9a1cbca3fd01bec184c849 (patch)
treea8db215579bc073fb2b1d6d9690dbb78c79aa52d /mm
parent503f7944fac68f4fdf71f8ebd06907f51eb64515 (diff)
mm: build_zonelists(): move clear node_load[] to __build_all_zonelists()
If node_load[] is cleared everytime build_zonelists() is called,node_load[] will have no help to find the next node that should appear in the given node's fallback list. Because of the bug, zonelist's node_order is not calculated as expected. This bug affects on big machine, which has asynmetric node distance. [synmetric NUMA's node distance] 0 1 2 0 10 12 12 1 12 10 12 2 12 12 10 [asynmetric NUMA's node distance] 0 1 2 0 10 12 20 1 12 10 14 2 20 14 10 This (my bug) is very old but no one has reported this for a long time. Maybe because the number of asynmetric NUMA is very small and they use cpuset for customizing node memory allocation fallback. [akpm@linux-foundation.org: fix CONFIG_NUMA=n build] Signed-off-by: Bo Liu <bo-liu@hotmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d052abbe3063..5cc986eb9f6f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2544,7 +2544,6 @@ static void build_zonelists(pg_data_t *pgdat)
2544 prev_node = local_node; 2544 prev_node = local_node;
2545 nodes_clear(used_mask); 2545 nodes_clear(used_mask);
2546 2546
2547 memset(node_load, 0, sizeof(node_load));
2548 memset(node_order, 0, sizeof(node_order)); 2547 memset(node_order, 0, sizeof(node_order));
2549 j = 0; 2548 j = 0;
2550 2549
@@ -2653,6 +2652,9 @@ static int __build_all_zonelists(void *dummy)
2653{ 2652{
2654 int nid; 2653 int nid;
2655 2654
2655#ifdef CONFIG_NUMA
2656 memset(node_load, 0, sizeof(node_load));
2657#endif
2656 for_each_online_node(nid) { 2658 for_each_online_node(nid) {
2657 pg_data_t *pgdat = NODE_DATA(nid); 2659 pg_data_t *pgdat = NODE_DATA(nid);
2658 2660