1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @key gc
  27  * @bug 8049831
  28  * @library /testlibrary /testlibrary/whitebox
  29  * @build TestCMSClassUnloadingEnabledHWM AllocateBeyondMetaspaceSize
  30  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  31  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  32  * @run driver TestCMSClassUnloadingEnabledHWM
  33  * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
  34  */
  35 
  36 import com.oracle.java.testlibrary.OutputAnalyzer;
  37 import com.oracle.java.testlibrary.ProcessTools;
  38 
  39 import java.util.ArrayList;
  40 import java.util.Arrays;
  41 
  42 public class TestCMSClassUnloadingEnabledHWM {
  43   private static long MetaspaceSize = 32 * 1024 * 1024;
  44   private static long YoungGenSize  = 32 * 1024 * 1024;
  45 
  46   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
  47     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  48       "-Xbootclasspath/a:.",
  49       "-XX:+UnlockDiagnosticVMOptions",
  50       "-XX:+WhiteBoxAPI",
  51       "-XX:MetaspaceSize=" + MetaspaceSize,
  52       "-Xmn" + YoungGenSize,
  53       "-XX:+UseConcMarkSweepGC",
  54       "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",
  55       "-XX:+PrintHeapAtGC",
  56       "-XX:+PrintGCDetails",
  57       "AllocateBeyondMetaspaceSize",
  58       "" + MetaspaceSize,
  59       "" + YoungGenSize);
  60     return new OutputAnalyzer(pb.start());
  61   }
  62 
  63   public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {
  64     return run(true);
  65   }
  66 
  67   public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {
  68     return run(false);
  69   }
  70 
  71   public static void testWithoutCMSClassUnloading() throws Exception {
  72     // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
  73     OutputAnalyzer out = runWithoutCMSClassUnloading();
  74 
  75     out.shouldMatch(".*Full GC.*");
  76     out.shouldNotMatch(".*CMS Initial Mark.*");
  77   }
  78 
  79   public static void testWithCMSClassUnloading() throws Exception {
  80     // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
  81     OutputAnalyzer out = runWithCMSClassUnloading();
  82 
  83     out.shouldMatch(".*CMS Initial Mark.*");
  84     out.shouldNotMatch(".*Full GC.*");
  85   }
  86 
  87   public static void main(String args[]) throws Exception {
  88     testWithCMSClassUnloading();
  89     testWithoutCMSClassUnloading();
  90   }
  91 }
  92