1 /*
2  * Copyright (c) 2014, 2018, 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
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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
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22  */
23 
24 /*
25  * @test
26  * @key gc
27  * @bug 8049831
28  * @library /test/lib
29  * @modules java.base/jdk.internal.misc
30  *          java.management
31  * @build sun.hotspot.WhiteBox
32  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
33  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
34  * @run driver TestG1ClassUnloadingHWM
35  * @summary Test that -XX:-ClassUnloadingWithConcurrentMark will trigger a Full GC when more than MetaspaceSize metadata is allocated.
36  */
37 
38 import jdk.test.lib.process.OutputAnalyzer;
39 import jdk.test.lib.process.ProcessTools;
40 import java.util.ArrayList;
41 import java.util.Arrays;
42 import sun.hotspot.WhiteBox;
43 
44 public class TestG1ClassUnloadingHWM {
45   private static long MetaspaceSize = 32 * 1024 * 1024;
46   private static long YoungGenSize  = 32 * 1024 * 1024;
47 
run(boolean enableUnloading)48   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
49     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
50       "-Xbootclasspath/a:.",
51       "-XX:+UnlockDiagnosticVMOptions",
52       "-XX:+WhiteBoxAPI",
53       "-XX:MetaspaceSize=" + MetaspaceSize,
54       "-Xmn" + YoungGenSize,
55       "-XX:+UseG1GC",
56       "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark",
57       "-Xlog:gc",
58       TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(),
59       "" + MetaspaceSize,
60       "" + YoungGenSize);
61     return new OutputAnalyzer(pb.start());
62   }
63 
runWithG1ClassUnloading()64   public static OutputAnalyzer runWithG1ClassUnloading() throws Exception {
65     return run(true);
66   }
67 
runWithoutG1ClassUnloading()68   public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {
69     return run(false);
70   }
71 
testWithoutG1ClassUnloading()72   public static void testWithoutG1ClassUnloading() throws Exception {
73     // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle.
74     OutputAnalyzer out = runWithoutG1ClassUnloading();
75 
76     out.shouldMatch(".*Pause Full.*");
77     out.shouldNotMatch(".*Pause Young \\(Concurrent Start\\).*");
78   }
79 
testWithG1ClassUnloading()80   public static void testWithG1ClassUnloading() throws Exception {
81     // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC.
82     OutputAnalyzer out = runWithG1ClassUnloading();
83 
84     out.shouldMatch(".*Pause Young \\(Concurrent Start\\).*");
85     out.shouldNotMatch(".*Pause Full.*");
86   }
87 
main(String args[])88   public static void main(String args[]) throws Exception {
89     testWithG1ClassUnloading();
90     testWithoutG1ClassUnloading();
91   }
92 
93   public static class AllocateBeyondMetaspaceSize {
94     public static Object dummy;
95 
main(String [] args)96     public static void main(String [] args) throws Exception {
97       if (args.length != 2) {
98         throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>");
99       }
100 
101       WhiteBox wb = WhiteBox.getWhiteBox();
102 
103       // Allocate past the MetaspaceSize limit
104       long metaspaceSize = Long.parseLong(args[0]);
105       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;
106       long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
107 
108       long youngGenSize = Long.parseLong(args[1]);
109       triggerYoungGCs(youngGenSize);
110 
111       wb.freeMetaspace(null, metaspace, metaspace);
112     }
113 
triggerYoungGCs(long youngGenSize)114     public static void triggerYoungGCs(long youngGenSize) {
115       long approxAllocSize = 32 * 1024;
116       long numAllocations  = 2 * youngGenSize / approxAllocSize;
117 
118       for (long i = 0; i < numAllocations; i++) {
119         dummy = new byte[(int)approxAllocSize];
120       }
121     }
122   }
123 }
124 
125