--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/utilities/ticks.cpp	Sat Nov 23 12:25:13 2013 +0100
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "runtime/os.hpp"
+#include "utilities/ticks.inline.hpp"
+
+#ifdef ASSERT
+ const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE
+#endif
+
+void Ticks::stamp() {
+  _stamp_ticks = os::elapsed_counter();
+}
+
+const Ticks Ticks::now() {
+  Ticks t;
+  t.stamp();
+  return t;
+}
+
+Tickspan::Tickspan(const Ticks& end, const Ticks& start) {
+  assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!");
+  assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!");
+
+  assert(end >= start, "negative time!");
+
+  _span_ticks = end.value() - start.value();
+}
+
+template <typename ReturnType>
+static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) {
+  assert(TicksToTimeHelper::SECONDS == unit ||
+         TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!");
+
+  ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit;
+
+  return (ReturnType) ((ReturnType)span.value() / frequency_per_unit);
+}
+
+double TicksToTimeHelper::seconds(const Tickspan& span) {
+  return time_conversion<double>(span, SECONDS);
+}
+
+jlong TicksToTimeHelper::milliseconds(const Tickspan& span) {
+  return time_conversion<jlong>(span, MILLISECONDS);
+}