[PATCH] scheduler: NUMA aware placement of sched_group_allnodes

[PATCH] scheduler: NUMA aware placement of sched_group_allnodes

[Christoph Lameter]

When the per cpu sched domains are build then they also need to be placed
on the node where the cpu resides otherwise we will have frequent off
node accesses which will slow down the system.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-rc6-mm2/kernel/sched.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/kernel/sched.c	2006-09-13 20:00:48.000000000 -0500
+++ linux-2.6.18-rc6-mm2/kernel/sched.c	2006-09-15 13:05:32.269416181 -0500
@@ -6449,9 +6449,10 @@ static int build_sched_domains(const cpu
 				> SD_NODES_PER_DOMAIN*cpus_weight(nodemask)) {
 			if (!sched_group_allnodes) {
 				sched_group_allnodes
-					= kmalloc(sizeof(struct sched_group)
-							* MAX_NUMNODES,
-						  GFP_KERNEL);
+					= kmalloc_node(sizeof(struct sched_group)
+						  	* MAX_NUMNODES,
+						  GFP_KERNEL,
+						  cpu_to_node(i));
 				if (!sched_group_allnodes) {
 					printk(KERN_WARNING
 					"Can not alloc allnodes sched group\n");

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