--- /dev/null	2017-07-07 09:32:06.000000000 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.debug/src/org/graalvm/compiler/debug/GlobalMetrics.java	2017-07-07 09:32:06.000000000 -0700
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2017, 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.io.IOException;
+import java.io.PrintStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Collections;
+import java.util.List;
+
+import org.graalvm.compiler.options.OptionValues;
+import org.graalvm.util.EconomicMap;
+import org.graalvm.util.MapCursor;
+import org.graalvm.util.Pair;
+
+/**
+ * Metric values that can be {@linkplain #add(DebugContext) updated} by multiple threads.
+ */
+public class GlobalMetrics {
+    long[] values;
+
+    /**
+     * Adds the values in {@code debug} to the values in this object.
+     */
+    public synchronized void add(DebugContext debug) {
+        values = debug.addValuesTo(values);
+    }
+
+    /**
+     * Clears all values in this object.
+     */
+    public void clear() {
+        values = null;
+    }
+
+    /**
+     * Creates and returns a sorted map from metric names to their values in this object.
+     */
+    public EconomicMap<MetricKey, Long> asKeyValueMap() {
+        List<MetricKey> keys = KeyRegistry.getKeys();
+        Collections.sort(keys, MetricKey.NAME_COMPARATOR);
+        EconomicMap<MetricKey, Long> res = EconomicMap.create(keys.size());
+        long[] vals = values;
+        for (MetricKey key : keys) {
+            int index = ((AbstractKey) key).getIndex();
+            if (vals == null || index >= vals.length) {
+                res.put(key, 0L);
+            } else {
+                res.put(key, vals[index]);
+            }
+        }
+        return res;
+    }
+
+    /**
+     * Prints the values in the object to the file specified by
+     * {@link DebugOptions#AggregatedMetricsFile} if present otherwise to
+     * {@link DebugContext#DEFAULT_LOG_STREAM}.
+     */
+    public void print(OptionValues options) {
+        long[] vals = values;
+        if (vals != null) {
+            EconomicMap<MetricKey, Long> map = asKeyValueMap();
+            String metricsFile = DebugOptions.AggregatedMetricsFile.getValue(options);
+            boolean csv = metricsFile != null && (metricsFile.endsWith(".csv") || metricsFile.endsWith(".CSV"));
+            try (PrintStream p = metricsFile == null ? DebugContext.DEFAULT_LOG_STREAM : new PrintStream(Files.newOutputStream(Paths.get(metricsFile)))) {
+                if (!csv) {
+                    if (!map.isEmpty()) {
+                        p.println("++ Aggregated Metrics ++");
+                    }
+                }
+                String csvFormat = CSVUtil.buildFormatString("%s", "%s", "%s");
+                MapCursor<MetricKey, Long> e = map.getEntries();
+                while (e.advance()) {
+                    MetricKey key = e.getKey();
+                    if (csv) {
+                        Pair<String, String> valueAndUnit = key.toCSVFormat(e.getValue());
+                        CSVUtil.Escape.println(p, csvFormat, key.getName(), valueAndUnit.getLeft(), valueAndUnit.getRight());
+                    } else {
+                        p.println(key.getName() + "=" + key.toHumanReadableFormat(e.getValue()));
+                    }
+                }
+                if (!csv) {
+                    if (!map.isEmpty()) {
+                        p.println("-- Aggregated Metrics --");
+                    }
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+        if (DebugOptions.ListMetrics.getValue(options)) {
+            PrintStream p = System.out;
+            p.println("++ Metric Keys ++");
+            List<MetricKey> keys = KeyRegistry.getKeys();
+            Collections.sort(keys, MetricKey.NAME_COMPARATOR);
+            for (MetricKey key : keys) {
+                String name = key.getDocName();
+                if (name != null) {
+                    String doc = key.getDoc();
+                    if (doc != null) {
+                        p.println(name + ": " + doc);
+                    } else {
+                        p.println(name);
+                    }
+                }
+            }
+            p.println("-- Metric Keys --");
+        }
+    }
+}