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authorChristoph Lameter <clameter@sgi.com>2007-10-16 01:25:30 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:58 -0700
commit6eaf806a223e61dc5f2de4ab591f11beb97a8f3b (patch)
treefd63b422c3cb357792d12f9170c354e25b94daa0 /mm/mempolicy.c
parent7ea1530ab3fdfa85441061909cc8040e84776fd4 (diff)
Memoryless nodes: Fix interleave behavior for memoryless nodes
MPOL_INTERLEAVE currently simply loops over all nodes. Allocations on memoryless nodes will be redirected to nodes with memory. This results in an imbalance because the neighboring nodes to memoryless nodes will get significantly more interleave hits that the rest of the nodes on the system. We can avoid this imbalance by clearing the nodes in the interleave node set that have no memory. If we use the node map of the memory nodes instead of the online nodes then we have only the nodes we want. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Tested-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: Bob Picco <bob.picco@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@skynet.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ccbdb22147bb..5daf63bd97e7 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -183,7 +183,9 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
switch (mode) {
case MPOL_INTERLEAVE:
policy->v.nodes = *nodes;
- if (nodes_weight(*nodes) == 0) {
+ nodes_and(policy->v.nodes, policy->v.nodes,
+ node_states[N_HIGH_MEMORY]);
+ if (nodes_weight(policy->v.nodes) == 0) {
kmem_cache_free(policy_cache, policy);
return ERR_PTR(-EINVAL);
}