--- old/src/share/vm/runtime/timer.hpp	2015-02-18 13:24:54.125923090 +0100
+++ new/src/share/vm/runtime/timer.hpp	2015-02-18 13:24:54.061921191 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2015, 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
@@ -103,6 +103,23 @@
   void resume()   { if (_active) _t.start(); }
 };
 
+class PhaseTimeData : public StackObj {
+public:
+  virtual bool active() const = 0;
+  virtual void set_value(uint phase, double value) = 0;
+};
+
+class TrackPhaseTime : public StackObj {
+ private:
+  PhaseTimeData* _data;
+  uint           _phase;
+  jlong          _last;
+ public:
+  // Constructors
+  TrackPhaseTime(PhaseTimeData *data, uint phase);
+  ~TrackPhaseTime();
+};
+
 class TraceCPUTime: public StackObj {
  private:
   bool _active;                 // true if times will be measured and printed