1 /*
   2  * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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.
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  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 TestHumongousAllocNearlyFullRegion
  26  * @bug 8143587
  27  * @summary G1: humongous object allocations should work even when there is
  28  *              not enough space in the heapRegion to fit a filler object.
  29  * @modules java.base/jdk.internal.misc
  30  * @library /test/lib
  31  * @run driver TestHumongousAllocNearlyFullRegion
  32  */
  33 
  34 import jdk.test.lib.process.OutputAnalyzer;
  35 import jdk.test.lib.process.ProcessTools;
  36 
  37 public class TestHumongousAllocNearlyFullRegion {
  38     // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to
  39     // fulfill alignment constraints.
  40     private static final int heapSize                       = 224; // MB
  41     private static final int heapRegionSize                 = 1;   // MB
  42 
  43     public static void main(String[] args) throws Exception {
  44         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  45             "-XX:+UseG1GC",
  46             "-Xms" + heapSize + "m",
  47             "-Xmx" + heapSize + "m",
  48             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
  49             "-Xlog:gc",
  50             HumongousObjectAllocator.class.getName());
  51 
  52         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  53         output.shouldContain("Pause Initial Mark (G1 Humongous Allocation)");
  54         output.shouldHaveExitValue(0);
  55     }
  56 
  57     static class HumongousObjectAllocator {
  58         public static void main(String [] args) {
  59             for (int i = 0; i < heapSize; i++) {
  60                 // 131069 is the number of longs it takes to fill a heapRegion except
  61                 // for 8 bytes on 64 bit.
  62                 long[] largeObect = new long[131069];
  63             }
  64         }
  65     }
  66 }
  67