[PATCH 20/36] autonuma: default mempolicy follow AutoNUMA

[Andrea Arcangeli <aarcange@redhat.com>]

If an task_selected_nid has already been selected for the task, try to
allocate memory from it even if it's temporarily not the local
node. Chances are it's where most of its memory is already located and
where it will run in the future.

Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
 mm/mempolicy.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index bd92431..19a8f72 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1951,10 +1951,18 @@ retry_cpuset:
 	 */
 	if (pol->mode == MPOL_INTERLEAVE)
 		page = alloc_page_interleave(gfp, order, interleave_nodes(pol));
-	else
+	else {
+		int nid = -1;
+#ifdef CONFIG_AUTONUMA
+		if (current->task_autonuma)
+			nid = current->task_autonuma->task_selected_nid;
+#endif
+		if (nid < 0)
+			nid = numa_node_id();
 		page = __alloc_pages_nodemask(gfp, order,
-				policy_zonelist(gfp, pol, numa_node_id()),
+				policy_zonelist(gfp, pol, nid),
 				policy_nodemask(gfp, pol));
+	}
 
 	if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
 		goto retry_cpuset;

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