diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/runtime/timer.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/timer.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 1997, 2016, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_RUNTIME_TIMER_HPP
+#define SHARE_VM_RUNTIME_TIMER_HPP
+
+#include "utilities/globalDefinitions.hpp"
+
+// Timers for simple measurement.
+
+class elapsedTimer VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+ private:
+  jlong _counter;
+  jlong _start_counter;
+  bool  _active;
+ public:
+  elapsedTimer()             { _active = false; reset(); }
+  elapsedTimer(jlong time, jlong timeUnitsPerSecond);
+  void add(elapsedTimer t);
+  void start();
+  void stop();
+  void reset()               { _counter = 0; }
+  double seconds() const;
+  jlong milliseconds() const;
+  jlong ticks() const        { return _counter; }
+  jlong active_ticks() const;
+  bool  is_active() const { return _active; }
+};
+
+// TimeStamp is used for recording when an event took place.
+class TimeStamp VALUE_OBJ_CLASS_SPEC {
+ private:
+  jlong _counter;
+ public:
+  TimeStamp()  { _counter = 0; }
+  void clear() { _counter = 0; }
+  // has the timestamp been updated since being created or cleared?
+  bool is_updated() const { return _counter != 0; }
+  // update to current elapsed time
+  void update();
+  // update to given elapsed time
+  void update_to(jlong ticks);
+  // returns seconds since updated
+  // (must not be in a cleared state:  must have been previously updated)
+  double seconds() const;
+  jlong milliseconds() const;
+  // ticks elapsed between VM start and last update
+  jlong ticks() const { return _counter; }
+  // ticks elapsed since last update
+  jlong ticks_since_update() const;
+};
+
+class TraceCPUTime: public StackObj {
+ private:
+  bool _active;                 // true if times will be measured and printed
+  bool _print_cr;               // if true print carriage return at end
+  double _starting_user_time;   // user time at start of measurement
+  double _starting_system_time; // system time at start of measurement
+  double _starting_real_time;   // real time at start of measurement
+  outputStream* _logfile;       // output is printed to this stream
+  bool _error;                  // true if an error occurred, turns off output
+
+ public:
+  TraceCPUTime(bool doit = true,
+               bool print_cr = true,
+               outputStream *logfile = NULL);
+  ~TraceCPUTime();
+};
+
+class TimeHelper {
+ public:
+  static double counter_to_seconds(jlong counter);
+  static double counter_to_millis(jlong counter);
+};
+
+#endif // SHARE_VM_RUNTIME_TIMER_HPP