--- old/src/share/vm/runtime/timer.hpp	2019-01-28 17:44:42.000000000 +0800
+++ new/src/share/vm/runtime/timer.hpp	2019-01-28 17:44:42.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, 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
@@ -123,6 +123,7 @@
 class TimeHelper {
  public:
   static double counter_to_seconds(jlong counter);
+  static double counter_to_milliseconds(jlong counter);
 };
 
 #endif // SHARE_VM_RUNTIME_TIMER_HPP