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 TestG1ClassUnloadingEnabledHWM AllocateBeyondMetaspaceSize
  30  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  31  * @run driver TestG1ClassUnloadingEnabledHWM
  32  * @summary Test that -XX:-G1ClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
  33  */
  34 
  35 import com.oracle.java.testlibrary.OutputAnalyzer;
  36 import com.oracle.java.testlibrary.ProcessTools;
  37 
  38 import java.util.ArrayList;
  39 import java.util.Arrays;
  40 
  41 public class TestG1ClassUnloadingEnabledHWM {
  42   private static long MetaspaceSize = 32 * 1024 * 1024;
  43   private static long YoungGenSize  = 32 * 1024 * 1024;
  44 
  45   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
  46     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  47       "-Xbootclasspath/a:.",
  48       "-XX:+WhiteBoxAPI",
  49       "-XX:MetaspaceSize=" + MetaspaceSize,
  50       "-Xmn" + YoungGenSize,
  51       "-XX:+UseG1GC",
  52       "-XX:" + (enableUnloading ? "+" : "-") + "G1ClassUnloadingEnabled",
  53       "-XX:+PrintHeapAtGC",
  54       "-XX:+PrintGCDetails",
  55       "AllocateBeyondMetaspaceSize",
  56       "" + MetaspaceSize,
  57       "" + YoungGenSize);
  58     return new OutputAnalyzer(pb.start());
  59   }
  60 
  61   public static OutputAnalyzer runWithG1ClassUnloading() throws Exception {
  62     return run(true);
  63   }
  64 
  65   public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {
  66     return run(false);
  67   }
  68 
  69   public static void testWithoutG1ClassUnloading() throws Exception {
  70     // -XX:-G1ClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
  71     OutputAnalyzer out = runWithoutG1ClassUnloading();
  72 
  73     out.shouldMatch(".*Full GC.*");
  74     out.shouldNotMatch(".*initial-mark.*");
  75   }
  76 
  77   public static void testWithG1ClassUnloading() throws Exception {
  78     // -XX:+G1ClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
  79     OutputAnalyzer out = runWithG1ClassUnloading();
  80 
  81     out.shouldMatch(".*initial-mark.*");
  82     out.shouldNotMatch(".*Full GC.*");
  83   }
  84 
  85   public static void main(String args[]) throws Exception {
  86     testWithG1ClassUnloading();
  87     testWithoutG1ClassUnloading();
  88   }
  89 }
  90