diff --git a/ChangeLog b/ChangeLog
index 08eca2c2d7..dead81a448 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jun 30 22:38:58 2011  Koichi Sasada  <ko1@atdot.net>
+
+	* benchmark/bm_vm2_defined_method.rb: added to measure performance of
+	  bmethod (method defined by define_method()).
+
 Thu Jun 30 22:17:04 2011  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_insnhelper.c (vm_call_bmethod): fix to hook call/return event
diff --git a/benchmark/bm_vm2_defined_method.rb b/benchmark/bm_vm2_defined_method.rb
new file mode 100644
index 0000000000..ad7555b379
--- /dev/null
+++ b/benchmark/bm_vm2_defined_method.rb
@@ -0,0 +1,9 @@
+class Object
+  define_method(:m){}
+end
+
+i=0
+while i<6000000 # benchmark loop 2
+  i+=1
+  m; m; m; m; m; m; m; m;
+end