1 /*
   2  * Copyright (c) 2014, 2016, 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
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  23 
  24 /*
  25  * @test TestWBGC
  26  * @bug 8055098
  27  * @summary Test verify that WB methods isObjectInOldGen and youngGC works correctly.
  28  * @requires vm.gc != "Z" & vm.gc != "Shenandoah"
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @build sun.hotspot.WhiteBox
  33  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  34  * @run driver TestWBGC
  35  */
  36 import jdk.test.lib.Asserts;
  37 import jdk.test.lib.process.ProcessTools;
  38 import jdk.test.lib.process.OutputAnalyzer;
  39 import sun.hotspot.WhiteBox;
  40 
  41 public class TestWBGC {
  42 
  43     public static void main(String args[]) throws Exception {
  44         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  45                 true,
  46                 "-Xbootclasspath/a:.",
  47                 "-XX:+UnlockDiagnosticVMOptions",
  48                 "-XX:+WhiteBoxAPI",
  49                 "-XX:MaxTenuringThreshold=1",
  50                 "-Xlog:gc",
  51                 GCYoungTest.class.getName());
  52 
  53         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  54         System.out.println(output.getStdout());
  55         output.shouldHaveExitValue(0);
  56         output.shouldContain("WhiteBox Initiated Young GC");
  57         output.shouldNotContain("Full");
  58         // To be sure that we don't provoke Full GC additionaly to young
  59     }
  60 
  61     public static class GCYoungTest {
  62         static WhiteBox wb = WhiteBox.getWhiteBox();
  63         public static Object obj;
  64 
  65         public static void main(String args[]) {
  66             obj = new Object();
  67             Asserts.assertFalse(wb.isObjectInOldGen(obj));
  68             wb.youngGC();
  69             wb.youngGC();
  70             // 2 young GC is needed to promote object into OldGen
  71             Asserts.assertTrue(wb.isObjectInOldGen(obj));
  72         }
  73     }
  74 }