Mercurial > hg > graal-jvmci-8
annotate test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java @ 24066:9050d85e2960 jdk8u102-b33
Added tag jdk8u102-b32 for changeset c8988d2e4212
author | asaha |
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date | Tue, 02 Aug 2016 08:02:27 -0700 |
parents | f3f2f71d2dc8 |
children |
rev | line source |
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23569
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1 /* |
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2 * Copyright (c) 2015, 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 TestNoEagerReclaimOfHumongousRegions |
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26 * @bug 8139424 |
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27 * @summary Test to check that a live humongous object is not eagerly reclaimed. This is a regression test for |
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28 * 8139424 and the test will crash if an eager reclaim occur. The test is not 100% deterministic and |
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29 * might pass even if there are problems in the code, but it will never crash unless there is a problem. |
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30 * @requires vm.gc=="G1" | vm.gc=="null" |
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31 * @key gc |
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32 * @library /testlibrary /testlibrary/whitebox |
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33 * @modules java.base/sun.misc |
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34 * @build TestNoEagerReclaimOfHumongousRegions |
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35 * @run main ClassFileInstaller sun.hotspot.WhiteBox |
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36 * sun.hotspot.WhiteBox$WhiteBoxPermission |
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37 * @run main/othervm -Xbootclasspath/a:. -XX:+PrintGC -XX:+UseG1GC -XX:MaxTenuringThreshold=0 -XX:G1RSetSparseRegionEntries=32 -XX:G1HeapRegionSize=1m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UnlockExperimentalVMOptions -XX:+G1TraceEagerReclaimHumongousObjects TestNoEagerReclaimOfHumongousRegions |
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38 */ |
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39 |
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40 import java.util.LinkedList; |
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41 |
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42 import sun.hotspot.WhiteBox; |
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43 |
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44 public class TestNoEagerReclaimOfHumongousRegions { |
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45 // Helper class to keep reference to humongous byte[]. |
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46 static class LargeRef { |
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47 private byte[] _ref; |
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48 |
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49 LargeRef(byte[] ref) { |
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50 _ref = ref; |
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51 } |
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52 |
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53 byte[] ref() { return _ref; } |
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54 } |
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55 |
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56 static LargeRef humongous_reference_holder; |
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57 |
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58 public static void main(String[] args) throws InterruptedException{ |
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59 WhiteBox wb = WhiteBox.getWhiteBox(); |
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60 LinkedList<Object> garbageAndRefList = new LinkedList<Object>(); |
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61 // Creating a 1M large byte array. Since the test specifies the heap |
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62 // region size to be 1m this will be a humongous object. We then |
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63 // store a pointer to the array in the static object to keep it live |
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64 // during the whole test. |
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65 humongous_reference_holder = new LargeRef(new byte[1 * 1024 * 1024]); |
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66 |
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67 // Create some garbage and a reference to the humongous object each round. |
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68 for (int i = 0; i < 32; i++) { |
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69 garbageAndRefList.add(new byte[400*1000]); |
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70 garbageAndRefList.add(new LargeRef(humongous_reference_holder.ref())); |
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71 |
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72 // Promote to old, goal is to get rem-set entries for the humongous |
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73 // object from different regions. The test specifies MaxTenuringThreshold=0, |
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74 // this will make sure we get objects promoted to old at once. |
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75 wb.youngGC(); |
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76 } |
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77 // Clear the garbage and reference list. |
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78 garbageAndRefList.clear(); |
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79 |
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80 // Run a concurrent mark cycle to mark all references but the static one as dead. |
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81 wb.g1StartConcMarkCycle(); |
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82 while (wb.g1InConcurrentMark()) { |
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83 Thread.sleep(100); |
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84 } |
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85 |
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86 // Run a young collection to make sure humongous object still can't be eagerly reclaimed. |
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87 wb.youngGC(); |
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88 // Will crash/assert if humongous object has been reclaimed. |
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89 wb.fullGC(); |
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90 } |
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91 } |