--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/utilities/ticks.hpp	Sat Nov 23 12:25:13 2013 +0100
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2013, 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_UTILITIES_TICKS_HPP
+#define SHARE_VM_UTILITIES_TICKS_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class Ticks;
+
+class Tickspan VALUE_OBJ_CLASS_SPEC {
+  friend class Ticks;
+  friend Tickspan operator-(const Ticks& end, const Ticks& start);
+
+ private:
+  jlong _span_ticks;
+
+  Tickspan(const Ticks& end, const Ticks& start);
+
+ public:
+  Tickspan() : _span_ticks(0) {}
+
+  Tickspan& operator+=(const Tickspan& rhs) {
+    _span_ticks += rhs._span_ticks;
+    return *this;
+  }
+
+  jlong value() const {
+    return _span_ticks;
+  }
+
+};
+
+class Ticks VALUE_OBJ_CLASS_SPEC {
+ private:
+  jlong _stamp_ticks;
+
+ public:
+  Ticks() : _stamp_ticks(0) {
+    assert((_stamp_ticks = invalid_time_stamp) == invalid_time_stamp,
+      "initial unstamped time value assignment");
+  }
+
+  Ticks& operator+=(const Tickspan& span) {
+    _stamp_ticks += span.value();
+    return *this;
+  }
+
+  Ticks& operator-=(const Tickspan& span) {
+    _stamp_ticks -= span.value();
+    return *this;
+  }
+
+  void stamp();
+
+  jlong value() const {
+    return _stamp_ticks;
+  }
+
+  static const Ticks now();
+
+#ifdef ASSERT
+  static const jlong invalid_time_stamp;
+#endif
+
+#ifndef PRODUCT
+  // only for internal use by GC VM tests
+  friend class TimePartitionPhasesIteratorTest;
+  friend class GCTimerTest;
+
+ private:
+  // implicit type conversion
+  Ticks(int ticks) : _stamp_ticks(ticks) {}
+
+#endif // !PRODUCT
+
+};
+
+class TicksToTimeHelper : public AllStatic {
+ public:
+  enum Unit {
+    SECONDS = 1,
+    MILLISECONDS = 1000
+  };
+  static double seconds(const Tickspan& span);
+  static jlong milliseconds(const Tickspan& span);
+};
+
+#endif // SHARE_VM_UTILITIES_TICKS_HPP