1 /*
2 * Copyright (c) 2014, 2021, 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 * @bug 8022865
27 * @summary Tests for the -XX:CompressedClassSpaceSize command line option
28 * @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
29 * @requires vm.flagless
30 * @library /test/lib
31 * @modules java.base/jdk.internal.misc
32 * java.management
33 * @run driver CompressedClassSpaceSize
34 */
35
36 import jdk.test.lib.process.ProcessTools;
37 import jdk.test.lib.process.OutputAnalyzer;
38
39 public class CompressedClassSpaceSize {
40
41 // Sizes beyond this will be rejected by hotspot arg parsing
42 // (Lilliput: see Metaspace::max_class_space_size() for details)
43 static final long max_class_space_size = 2013265920;
44
45 // Below this size class space will be silently enlarged to a multiple of this size
46 static final long min_class_space_size = 4194304;
47
48 public static void main(String[] args) throws Exception {
49 ProcessBuilder pb;
50 OutputAnalyzer output;
51
52 // Invalid size of -1 should be handled correctly
53 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1",
54 "-version");
55 output = new OutputAnalyzer(pb.start());
56 output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'")
57 .shouldHaveExitValue(1);
58
59 ///////////
60
61 // Going below the minimum size for class space (one root chunk size = atm 4M) should be transparently
62 // handled by the hotspot, which should round up class space size and not report an error.
63 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=1m",
64 "-Xlog:gc+metaspace=trace",
65 "-version");
66 output = new OutputAnalyzer(pb.start());
67 output.shouldMatch("Compressed class space.*" + min_class_space_size)
68 .shouldHaveExitValue(0);
69
70 ///////////
71
72 // Try 0. Same result expected.
73 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0",
74 "-Xlog:gc+metaspace=trace",
75 "-version");
76 output = new OutputAnalyzer(pb.start());
77 output.shouldMatch("Compressed class space.*" + min_class_space_size)
78 .shouldHaveExitValue(0);
79
80 ///////////
81
82 // Try max allowed size, which should be accepted
83 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
84 "-XX:CompressedClassSpaceSize=" + max_class_space_size,
85 "-Xlog:gc+metaspace=trace",
86 "-version");
87 output = new OutputAnalyzer(pb.start());
88 output.shouldMatch("Compressed class space.*" + max_class_space_size)
89 .shouldHaveExitValue(0);
90
91 ///////////
92
93 // Set max allowed size + 1, which should graciously fail
94 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
95 "-XX:CompressedClassSpaceSize=" + (max_class_space_size + 1),
96 "-Xlog:gc+metaspace=trace",
97 "-version");
98 output = new OutputAnalyzer(pb.start());
99 output.shouldContain("CompressedClassSpaceSize " + (max_class_space_size + 1) + " too large (max: " + max_class_space_size)
100 .shouldHaveExitValue(1);
101
102 }
103 }