On 04/24/2012 02:17 PM, Christoph Lameter wrote:
On Tue, 24 Apr 2012, Larry Woodman wrote:
How does this look:
Could you please send the patches inline? Its difficult to quote the
attachment.
Sorry all of these email clients are different.
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index f563fa3..b76b49a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1012,6 +1012,24 @@ int do_migrate_pages(struct mm_struct *mm,
int dest = 0;
for_each_node_mask(s, tmp) {
+
+ /*
+ * IFF there is an equal number of source and
+ * destination nodes, maintain relative node
distance
+ * even when source and destination nodes overlap.
+ * However, when the node weight is
unequal/there are
+ * a different number of source and destination
nodes,
+ * never move memory out of a source node that
is also
+ * a destination node.
+ *
+ * Example: [2,3,4] -> [3,4,5] moves everything.
+ * [0-7] - > [3,4,5] moves only 0,1,2,6,7.
+ */
+
+ if ((nodes_weight(*from_nodes) !=
nodes_weight(*to_nodes)) &&
+ (node_isset(s, *to_nodes)))
+ continue;
+
d = node_remap(s, *from_nodes, *to_nodes);
if (s == d)
continue;
--
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