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annotate test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents f3f2f71d2dc8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 }
f3f2f71d2dc8 8139424: SIGSEGV, Problematic frame: # V [libjvm.so+0xd0c0cc] void InstanceKlass::oop_oop_iterate_oop_maps_specialized<true,oopDesc*,MarkAndPushClosure>
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91 }