1 /*
   2  * Copyright (c) 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
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test TestRegionLivenessPrint.java
  26  * @bug 8151920
  27  * @requires vm.gc=="G1" | vm.gc=="null"
  28  * @summary Make sure that G1 does not assert when printing region liveness data on a humongous continues region.
  29  * @key gc
  30  * @library /testlibrary /test/lib
  31  * @modules java.base/jdk.internal.misc
  32  * @build TestRegionLivenessPrint
  33  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  34  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+WhiteBoxAPI -XX:+UseG1GC -Xmx128M -XX:G1HeapRegionSize=1m -Xlog:gc+liveness=trace TestRegionLivenessPrint
  36  */
  37 
  38 import sun.hotspot.WhiteBox;
  39 
  40 public class TestRegionLivenessPrint {
  41 
  42   static byte[] bigobj = new byte[1024* 1024 * 2];
  43 
  44   public static void main(String[] args) throws InterruptedException {
  45       WhiteBox wb = WhiteBox.getWhiteBox();
  46       // Run a concurrent mark cycle to trigger the liveness accounting log messages.
  47       wb.g1StartConcMarkCycle();
  48       while (wb.g1InConcurrentMark()) {
  49           Thread.sleep(100);
  50       }
  51   }
  52 
  53 }