radix-tree: fix preload vector size
authorNick Piggin <npiggin@kernel.dk>
Tue, 29 May 2012 22:07:34 +0000 (15:07 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 29 May 2012 23:22:33 +0000 (16:22 -0700)
We are not preallocating a sufficient number of nodes.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/radix-tree.c

index 86516f5588e31782676087fd49fe45fd87538c03..d7c878cc006cf62ac2b0b0abb1a3a69fa62c64e2 100644 (file)
@@ -72,12 +72,25 @@ static unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH + 1] __read_mostly;
  */
 static struct kmem_cache *radix_tree_node_cachep;
 
+/*
+ * The radix tree is variable-height, so an insert operation not only has
+ * to build the branch to its corresponding item, it also has to build the
+ * branch to existing items if the size has to be increased (by
+ * radix_tree_extend).
+ *
+ * The worst case is a zero height tree with just a single item at index 0,
+ * and then inserting an item at index ULONG_MAX. This requires 2 new branches
+ * of RADIX_TREE_MAX_PATH size to be created, with only the root node shared.
+ * Hence:
+ */
+#define RADIX_TREE_PRELOAD_SIZE (RADIX_TREE_MAX_PATH * 2 - 1)
+
 /*
  * Per-cpu pool of preloaded nodes
  */
 struct radix_tree_preload {
        int nr;
-       struct radix_tree_node *nodes[RADIX_TREE_MAX_PATH];
+       struct radix_tree_node *nodes[RADIX_TREE_PRELOAD_SIZE];
 };
 static DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, };