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23 import jdk.test.lib.process.ProcessTools;
24 import jdk.test.lib.process.OutputAnalyzer;
25 import jdk.test.lib.Asserts;
26 import sun.hotspot.WhiteBox;
27 
28 /* @test TestMetaspaceCMSCancel
29  * @bug 8026752
30  * @summary Tests cancel of CMS concurrent cycle for Metaspace after a full GC
31  * @requires !vm.graal.enabled
32  * @library /test/lib
33  * @modules java.base/jdk.internal.misc
34  * @build sun.hotspot.WhiteBox
35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
36  * @run main/othervm TestMetaspaceCMSCancel
37  */
38 
39 
40 public class TestMetaspaceCMSCancel {
41 
main(String[] args)42     public static void main(String[] args) throws Exception {
43         // Set a small MetaspaceSize so that a CMS concurrent collection will be
44         // scheduled.  Set CMSWaitDuration to 5s so that the concurrent collection
45         // start may be delayed.  It does not guarantee 5s before the start of the
46         // concurrent collection but does increase the probability that it will
47         // be started later.  System.gc() is used to invoke a full collection.  Set
48         // ExplicitGCInvokesConcurrent to off so it is a STW collection.
49         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:.",
50                                                                   "-XX:+UnlockDiagnosticVMOptions",
51                                                                   "-XX:+WhiteBoxAPI",
52                                                                   "-XX:+UseConcMarkSweepGC",
53                                                                   "-XX:MetaspaceSize=2m",
54                                                                   "-XX:CMSWaitDuration=5000",
55                                                                   "-XX:-ExplicitGCInvokesConcurrent",
56                                                                   "-Xlog:gc*=debug",
57                                                                   MetaspaceGCTest.class.getName());
58 
59         OutputAnalyzer output = new OutputAnalyzer(pb.start());
60         output.shouldNotContain("Concurrent Reset");
61         output.shouldHaveExitValue(0);
62     }
63 
64     static class MetaspaceGCTest {
main(String [] args)65         public static void main(String [] args) {
66             WhiteBox wb = WhiteBox.getWhiteBox();
67             System.gc();
68             Asserts.assertFalse(wb.metaspaceShouldConcurrentCollect());
69         }
70     }
71 }
72