--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/metaspace/TestPerfCountersAndMemoryPools.java	Tue Sep 17 20:59:07 2013 +0200
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+import java.util.List;
+import java.lang.management.*;
+
+import com.oracle.java.testlibrary.*;
+import static com.oracle.java.testlibrary.Asserts.*;
+
+/* @test TestPerfCountersAndMemoryPools
+ * @bug 8023476
+ * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace
+ *          report the same data.
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData TestPerfCountersAndMemoryPools
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData TestPerfCountersAndMemoryPools
+ */
+public class TestPerfCountersAndMemoryPools {
+    public static void main(String[] args) throws Exception {
+        checkMemoryUsage("Metaspace", "sun.gc.metaspace");
+
+        if (InputArguments.contains("-XX:+UseCompressedKlassPointers") && Platform.is64bit()) {
+            checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace");
+        }
+    }
+
+    private static MemoryUsage getMemoryUsage(String memoryPoolName) {
+        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
+        for (MemoryPoolMXBean pool : pools) {
+            if (pool.getName().equals(memoryPoolName)) {
+                return pool.getUsage();
+            }
+        }
+
+        throw new RuntimeException("Excpted to find a memory pool with name " +
+                                   memoryPoolName);
+    }
+
+    private static void checkMemoryUsage(String memoryPoolName, String perfNS)
+        throws Exception {
+        // Need to do a gc before each comparison to update the perf counters
+
+        System.gc();
+        MemoryUsage mu = getMemoryUsage(memoryPoolName);
+        assertEQ(getMinCapacity(perfNS), mu.getInit());
+
+        System.gc();
+        mu = getMemoryUsage(memoryPoolName);
+        assertEQ(getUsed(perfNS), mu.getUsed());
+
+        System.gc();
+        mu = getMemoryUsage(memoryPoolName);
+        assertEQ(getCapacity(perfNS), mu.getCommitted());
+    }
+
+    private static long getMinCapacity(String ns) throws Exception {
+        return PerfCounters.findByName(ns + ".minCapacity").longValue();
+    }
+
+    private static long getCapacity(String ns) throws Exception {
+        return PerfCounters.findByName(ns + ".capacity").longValue();
+    }
+
+    private static long getUsed(String ns) throws Exception {
+        return PerfCounters.findByName(ns + ".used").longValue();
+    }
+}