SLUB: rename defrag to remote_node_defrag_ratio

The NUMA defrag works by allocating objects from partial slabs on remote
nodes.  Rename it to

	remote_node_defrag_ratio

to be clear about this.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 40801e7..a06ee26 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -59,7 +59,10 @@
 #endif
 
 #ifdef CONFIG_NUMA
-	int defrag_ratio;
+	/*
+	 * Defragmentation by allocating from a remote node.
+	 */
+	int remote_node_defrag_ratio;
 	struct kmem_cache_node *node[MAX_NUMNODES];
 #endif
 #ifdef CONFIG_SMP