--- old/src/share/vm/runtime/timer.cpp	2019-01-28 17:44:41.000000000 +0800
+++ new/src/share/vm/runtime/timer.cpp	2019-01-28 17:44:40.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -48,6 +48,12 @@
   return counter/freq;
 }
 
+double TimeHelper::counter_to_milliseconds(jlong counter) {
+  double count = (double) counter;
+  double freq  = (double) os::elapsed_frequency() / (double) 1000;
+  return counter/freq;
+}
+
 void elapsedTimer::add(elapsedTimer t) {
   _counter += t._counter;
 }