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. 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 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