1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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  * @library /testlibrary
  30  * @run driver TestHumongousAllocNearlyFullRegion
  31  */
  32 
  33 import jdk.test.lib.*;
  34 
  35 public class TestHumongousAllocNearlyFullRegion {
  36     // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to
  37     // fulfill alignment constraints.
  38     private static final int heapSize                       = 224; // MB
  39     private static final int heapRegionSize                 = 1;   // MB
  40 
  41     public static void main(String[] args) throws Exception {
  42         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  43             "-XX:+UseG1GC",
  44             "-Xms" + heapSize + "m",
  45             "-Xmx" + heapSize + "m",
  46             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
  47             "-XX:+PrintGC",
  48             HumongousObjectAllocator.class.getName());
  49 
  50         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  51         output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");
  52         output.shouldHaveExitValue(0);
  53     }
  54 
  55     static class HumongousObjectAllocator {
  56         public static void main(String [] args) {
  57             for (int i = 0; i < heapSize; i++) {
  58                 // 131069 is the number of longs it takes to fill a heapRegion except
  59                 // for 8 bytes on 64 bit.
  60                 long[] largeObect = new long[131069];
  61             }
  62         }
  63     }
  64 }
  65