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annotate test/gc/g1/TestEagerReclaimHumongousRegions2.java @ 20307:04d77ac27223

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8051973: Eager reclaim leaves marks of marked but reclaimed objects on the next bitmap Summary: Eager reclaim also needs to clear marks of eagerly reclaimed regions if they have already been marked during concurrent mark. Reviewed-by: jmasa
author tschatzl
date Thu, 31 Jul 2014 09:23:24 +0200
parents
children 2d1534aa7131
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20307
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test TestEagerReclaimHumongousRegions2
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26 * @bug 8051973
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27 * @summary Test to make sure that eager reclaim of humongous objects correctly clears
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28 * mark bitmaps at reclaim.
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29 * @key gc
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30 * @library /testlibrary
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31 */
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32
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33 import java.util.ArrayList;
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34 import java.util.LinkedList;
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35 import java.util.Random;
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36
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37 import com.oracle.java.testlibrary.OutputAnalyzer;
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38 import com.oracle.java.testlibrary.ProcessTools;
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39
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40 // An object that has a few references to other instances to slow down marking.
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41 class ObjectWithSomeRefs {
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42 public ObjectWithSomeRefs other1;
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43 public ObjectWithSomeRefs other2;
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44 public ObjectWithSomeRefs other3;
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45 public ObjectWithSomeRefs other4;
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46 }
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47
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48 class ReclaimRegionFast {
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49 public static final int M = 1024*1024;
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50
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51 public static LinkedList<Object> garbageList = new LinkedList<Object>();
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52
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53 public static void genGarbage(Object large) {
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54 for (int i = 0; i < 64*1024; i++) {
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55 Object[] garbage = new Object[50];
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56 garbage[0] = large;
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57 garbageList.add(garbage);
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58 }
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59 garbageList.clear();
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60 }
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61
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62 public static ArrayList<ObjectWithSomeRefs> longList = new ArrayList<ObjectWithSomeRefs>();
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63
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64 public static void main(String[] args) {
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65
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66 for (int i = 0; i < 16*1024; i++) {
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67 longList.add(new ObjectWithSomeRefs());
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68 }
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69
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70 Random rnd = new Random();
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71 for (int i = 0; i < longList.size(); i++) {
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72 int len = longList.size();
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73 longList.get(i).other1 = longList.get(rnd.nextInt(len));
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74 longList.get(i).other2 = longList.get(rnd.nextInt(len));
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75 longList.get(i).other3 = longList.get(rnd.nextInt(len));
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76 longList.get(i).other4 = longList.get(rnd.nextInt(len));
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77 }
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78
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79 int[] large1 = new int[M];
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80 int[] large2 = null;
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81 int[] large3 = null;
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82 int[] large4 = null;
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83
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84 Object ref_from_stack = large1;
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85
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86 for (int i = 0; i < 20; i++) {
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87 // A set of large objects that will be reclaimed eagerly - and hopefully marked.
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88 large1 = new int[M - 20];
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89 large2 = new int[M - 20];
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90 large3 = new int[M - 20];
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91 large4 = new int[M - 20];
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92 genGarbage(large1);
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93 // Make sure that the compiler cannot completely remove
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94 // the allocation of the large object until here.
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95 System.out.println(large1 + " " + large2 + " " + large3 + " " + large4);
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96 }
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97
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98 // Keep the reference to the first object alive.
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99 System.out.println(ref_from_stack);
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100 }
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101 }
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102
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103 public class TestEagerReclaimHumongousRegions2 {
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104 public static void main(String[] args) throws Exception {
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105 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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106 "-XX:+UseG1GC",
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107 "-Xms128M",
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108 "-Xmx128M",
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109 "-Xmn2M",
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110 "-XX:G1HeapRegionSize=1M",
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111 "-XX:InitiatingHeapOccupancyPercent=0", // Want to have as much as possible initial marks.
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112 "-XX:+PrintGC",
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113 "-XX:+VerifyAfterGC",
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114 "-XX:ConcGCThreads=1", // Want to make marking as slow as possible.
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115 "-XX:+IgnoreUnrecognizedVMOptions", // G1VerifyBitmaps is develop only.
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116 "-XX:+G1VerifyBitmaps",
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117 ReclaimRegionFast.class.getName());
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118 OutputAnalyzer output = new OutputAnalyzer(pb.start());
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119 output.shouldHaveExitValue(0);
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120 }
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121 }
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122