[PATCH] slab: add transfer_objects() function

slabr_objects() can be used to transfer objects between various object
caches of the slab allocator.  It is currently only used during
__cache_alloc() to retrieve elements from the shared array.  We will be
using it soon to transfer elements from the alien caches to the remote
shared array.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/slab.c

@@ -898,6 +898,30 @@ static struct array_cache *alloc_arraycache(int node, int entries,
 	return nc;
 }
 
+/*
+ * Transfer objects in one arraycache to another.
+ * Locking must be handled by the caller.
+ *
+ * Return the number of entries transferred.
+ */
+static int transfer_objects(struct array_cache *to,
+		struct array_cache *from, unsigned int max)
+{
+	/* Figure out how many entries to transfer */
+	int nr = min(min(from->avail, max), to->limit - to->avail);
+
+	if (!nr)
+		return 0;
+
+	memcpy(to->entry + to->avail, from->entry + from->avail -nr,
+			sizeof(void *) *nr);
+
+	from->avail -= nr;
+	to->avail += nr;
+	to->touched = 1;
+	return nr;
+}
+
 #ifdef CONFIG_NUMA
 static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int);
 static void *alternate_node_alloc(struct kmem_cache *, gfp_t);
@@ -2680,20 +2704,10 @@ retry:
 	BUG_ON(ac->avail > 0 || !l3);
 	spin_lock(&l3->list_lock);
 
-	if (l3->shared) {
-		struct array_cache *shared_array = l3->shared;
-		if (shared_array->avail) {
-			if (batchcount > shared_array->avail)
-				batchcount = shared_array->avail;
-			shared_array->avail -= batchcount;
-			ac->avail = batchcount;
-			memcpy(ac->entry,
-			       &(shared_array->entry[shared_array->avail]),
-			       sizeof(void *) * batchcount);
-			shared_array->touched = 1;
-			goto alloc_done;
-		}
-	}
+	/* See if we can refill from the shared array */
+	if (l3->shared && transfer_objects(ac, l3->shared, batchcount))
+		goto alloc_done;
+
 	while (batchcount > 0) {
 		struct list_head *entry;
 		struct slab *slabp;