1 /*
   2  * Copyright (c) 2014, 2015, 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 /test/lib
  29  * @modules java.base/sun.misc
  30  *          java.management
  31  * @build TestCMSClassUnloadingEnabledHWM
  32  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  33  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  34  * @run driver TestCMSClassUnloadingEnabledHWM
  35  * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
  36  */
  37 
  38 import jdk.test.lib.OutputAnalyzer;
  39 import jdk.test.lib.ProcessTools;
  40 import java.lang.management.GarbageCollectorMXBean;
  41 import java.lang.management.ManagementFactory;
  42 import java.util.ArrayList;
  43 import java.util.Arrays;
  44 import sun.hotspot.WhiteBox;
  45 
  46 public class TestCMSClassUnloadingEnabledHWM {
  47   private static long MetaspaceSize = 32 * 1024 * 1024;
  48   private static long YoungGenSize  = 32 * 1024 * 1024;
  49 
  50   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
  51     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  52       "-Xbootclasspath/a:.",
  53       "-XX:+UnlockDiagnosticVMOptions",
  54       "-XX:+WhiteBoxAPI",
  55       "-Xmx128m",
  56       "-XX:CMSMaxAbortablePrecleanTime=1",
  57       "-XX:CMSWaitDuration=50",
  58       "-XX:MetaspaceSize=" + MetaspaceSize,
  59       "-Xmn" + YoungGenSize,
  60       "-XX:+UseConcMarkSweepGC",
  61       "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",
  62       "-XX:+PrintHeapAtGC",
  63       "-XX:+PrintGCDetails",
  64       "-XX:+PrintGCTimeStamps",
  65       TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),
  66       "" + MetaspaceSize);
  67     return new OutputAnalyzer(pb.start());
  68   }
  69 
  70   public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {
  71     return run(true);
  72   }
  73 
  74   public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {
  75     return run(false);
  76   }
  77 
  78   public static void testWithoutCMSClassUnloading() throws Exception {
  79     // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
  80     OutputAnalyzer out = runWithoutCMSClassUnloading();
  81 
  82     out.shouldMatch(".*Full GC.*");
  83     out.shouldNotMatch(".*CMS Initial Mark.*");
  84   }
  85 
  86   public static void testWithCMSClassUnloading() throws Exception {
  87     // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
  88     OutputAnalyzer out = runWithCMSClassUnloading();
  89 
  90     out.shouldMatch(".*CMS Initial Mark.*");
  91     out.shouldNotMatch(".*Full GC.*");
  92   }
  93 
  94   public static void main(String args[]) throws Exception {
  95     testWithCMSClassUnloading();
  96     testWithoutCMSClassUnloading();
  97   }
  98 
  99   public static class AllocateBeyondMetaspaceSize {
 100     public static void main(String [] args) throws Exception {
 101       if (args.length != 1) {
 102         throw new IllegalArgumentException("Usage: <MetaspaceSize>");
 103       }
 104 
 105       WhiteBox wb = WhiteBox.getWhiteBox();
 106 
 107       // Allocate past the MetaspaceSize limit.
 108       long metaspaceSize = Long.parseLong(args[0]);
 109       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;
 110       long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
 111 
 112       // Wait for at least one GC to occur. The caller will parse the log files produced.
 113       GarbageCollectorMXBean cmsGCBean = getCMSGCBean();
 114       while (cmsGCBean.getCollectionCount() == 0) {
 115         Thread.sleep(100);
 116       }
 117 
 118       wb.freeMetaspace(null, metaspace, metaspace);
 119     }
 120 
 121     private static GarbageCollectorMXBean getCMSGCBean() {
 122       for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
 123         if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {
 124           return gcBean;
 125         }
 126       }
 127       return null;
 128     }
 129   }
 130 }
 131