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>

2 files changed, 13 insertions, 9 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 40801e754afb..a06ee26193c2 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -59,7 +59,10 @@ struct kmem_cache {
 #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
diff --git a/mm/slub.c b/mm/slub.c
index 9aa12b54ad1b..5146e2779c11 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1295,7 +1295,8 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
          * expensive if we do it every time we are trying to find a slab
          * with available objects.
          */
-        if (!s->defrag_ratio || get_cycles() % 1024 > s->defrag_ratio)
+        if (!s->remote_node_defrag_ratio ||
+                        get_cycles() % 1024 > s->remote_node_defrag_ratio)
                 return NULL;
 
         zonelist = &NODE_DATA(slab_node(current->mempolicy))
@@ -2209,7 +2210,7 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
 
         s->refcount = 1;
 #ifdef CONFIG_NUMA
-        s->defrag_ratio = 100;
+        s->remote_node_defrag_ratio = 100;
 #endif
         if (!init_kmem_cache_nodes(s, gfpflags & ~SLUB_DMA))
                 goto error;
@@ -3847,21 +3848,21 @@ static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
 SLAB_ATTR_RO(free_calls);
 
 #ifdef CONFIG_NUMA
-static ssize_t defrag_ratio_show(struct kmem_cache *s, char *buf)
+static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
 {
-        return sprintf(buf, "%d\n", s->defrag_ratio / 10);
+        return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10);
 }
 
-static ssize_t defrag_ratio_store(struct kmem_cache *s,
+static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
                                 const char *buf, size_t length)
 {
         int n = simple_strtoul(buf, NULL, 10);
 
         if (n < 100)
-                s->defrag_ratio = n * 10;
+                s->remote_node_defrag_ratio = n * 10;
         return length;
 }
-SLAB_ATTR(defrag_ratio);
+SLAB_ATTR(remote_node_defrag_ratio);
 #endif
 
 static struct attribute * slab_attrs[] = {
@@ -3892,7 +3893,7 @@ static struct attribute * slab_attrs[] = {
         &cache_dma_attr.attr,
 #endif
 #ifdef CONFIG_NUMA
-        &defrag_ratio_attr.attr,
+        &remote_node_defrag_ratio_attr.attr,
 #endif
         NULL
 };