--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.debug/src/org/graalvm/compiler/debug/TimeSource.java	2017-02-15 16:58:23.547050654 -0800
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+package org.graalvm.compiler.debug;
+
+import java.lang.management.ThreadMXBean;
+
+/**
+ * A consistent source of timing data that should be used by all facilities in the debug package.
+ */
+public class TimeSource {
+    private static final boolean USING_BEAN;
+    private static final ThreadMXBean threadMXBean;
+
+    static {
+        threadMXBean = Management.getThreadMXBean();
+        if (threadMXBean.isThreadCpuTimeSupported()) {
+            USING_BEAN = true;
+        } else {
+            USING_BEAN = false;
+        }
+    }
+
+    /**
+     * Gets the current time of this thread in nanoseconds from the most accurate timer available on
+     * the system. The returned value will be the current time in nanoseconds precision but not
+     * necessarily nanoseconds accuracy.
+     * <p>
+     * The intended use case of this method is to measure the time a certain action takes by making
+     * successive calls to it. It should not be used to measure total times in the sense of a time
+     * stamp.
+     *
+     * @return the current thread's time in nanoseconds
+     */
+    public static long getTimeNS() {
+        return USING_BEAN ? threadMXBean.getCurrentThreadCpuTime() : System.nanoTime();
+    }
+
+}