--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/class_unloading/TestG1ClassUnloadingHWM.java	Wed Aug 06 09:55:16 2014 +0200
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/*
+ * @test
+ * @key gc
+ * @bug 8049831
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestG1ClassUnloadingHWM AllocateBeyondMetaspaceSize
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * @run driver TestG1ClassUnloadingHWM
+ * @summary Test that -XX:-ClassUnloadingWithConcurrentMark will trigger a Full GC when more than MetaspaceSize metadata is allocated.
+ */
+
+import com.oracle.java.testlibrary.OutputAnalyzer;
+import com.oracle.java.testlibrary.ProcessTools;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class TestG1ClassUnloadingHWM {
+  private static long MetaspaceSize = 32 * 1024 * 1024;
+  private static long YoungGenSize  = 32 * 1024 * 1024;
+
+  private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+      "-Xbootclasspath/a:.",
+      "-XX:+WhiteBoxAPI",
+      "-XX:MetaspaceSize=" + MetaspaceSize,
+      "-Xmn" + YoungGenSize,
+      "-XX:+UseG1GC",
+      "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark",
+      "-XX:+PrintHeapAtGC",
+      "-XX:+PrintGCDetails",
+      "AllocateBeyondMetaspaceSize",
+      "" + MetaspaceSize,
+      "" + YoungGenSize);
+    return new OutputAnalyzer(pb.start());
+  }
+
+  public static OutputAnalyzer runWithG1ClassUnloading() throws Exception {
+    return run(true);
+  }
+
+  public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {
+    return run(false);
+  }
+
+  public static void testWithoutG1ClassUnloading() throws Exception {
+    // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle.
+    OutputAnalyzer out = runWithoutG1ClassUnloading();
+
+    out.shouldMatch(".*Full GC.*");
+    out.shouldNotMatch(".*initial-mark.*");
+  }
+
+  public static void testWithG1ClassUnloading() throws Exception {
+    // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC.
+    OutputAnalyzer out = runWithG1ClassUnloading();
+
+    out.shouldMatch(".*initial-mark.*");
+    out.shouldNotMatch(".*Full GC.*");
+  }
+
+  public static void main(String args[]) throws Exception {
+    testWithG1ClassUnloading();
+    testWithoutG1ClassUnloading();
+  }
+}
+