Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java
test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java
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| 1 /* | |
| 2 * Copyright (c) 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 TestNoEagerReclaimOfHumongousRegions | |
| 26 * @bug 8139424 | |
| 27 * @summary Test to check that a live humongous object is not eagerly reclaimed. This is a regression test for | |
| 28 * 8139424 and the test will crash if an eager reclaim occur. The test is not 100% deterministic and | |
| 29 * might pass even if there are problems in the code, but it will never crash unless there is a problem. | |
| 30 * @requires vm.gc=="G1" | vm.gc=="null" | |
| 31 * @key gc | |
| 32 * @library /testlibrary /testlibrary/whitebox | |
| 33 * @modules java.base/sun.misc | |
| 34 * @build TestNoEagerReclaimOfHumongousRegions | |
| 35 * @run main ClassFileInstaller sun.hotspot.WhiteBox | |
| 36 * sun.hotspot.WhiteBox$WhiteBoxPermission | |
| 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 | |
| 38 */ | |
| 39 | |
| 40 import java.util.LinkedList; | |
| 41 | |
| 42 import sun.hotspot.WhiteBox; | |
| 43 | |
| 44 public class TestNoEagerReclaimOfHumongousRegions { | |
| 45 // Helper class to keep reference to humongous byte[]. | |
| 46 static class LargeRef { | |
| 47 private byte[] _ref; | |
| 48 | |
| 49 LargeRef(byte[] ref) { | |
| 50 _ref = ref; | |
| 51 } | |
| 52 | |
| 53 byte[] ref() { return _ref; } | |
| 54 } | |
| 55 | |
| 56 static LargeRef humongous_reference_holder; | |
| 57 | |
| 58 public static void main(String[] args) throws InterruptedException{ | |
| 59 WhiteBox wb = WhiteBox.getWhiteBox(); | |
| 60 LinkedList<Object> garbageAndRefList = new LinkedList<Object>(); | |
| 61 // Creating a 1M large byte array. Since the test specifies the heap | |
| 62 // region size to be 1m this will be a humongous object. We then | |
| 63 // store a pointer to the array in the static object to keep it live | |
| 64 // during the whole test. | |
| 65 humongous_reference_holder = new LargeRef(new byte[1 * 1024 * 1024]); | |
| 66 | |
| 67 // Create some garbage and a reference to the humongous object each round. | |
| 68 for (int i = 0; i < 32; i++) { | |
| 69 garbageAndRefList.add(new byte[400*1000]); | |
| 70 garbageAndRefList.add(new LargeRef(humongous_reference_holder.ref())); | |
| 71 | |
| 72 // Promote to old, goal is to get rem-set entries for the humongous | |
| 73 // object from different regions. The test specifies MaxTenuringThreshold=0, | |
| 74 // this will make sure we get objects promoted to old at once. | |
| 75 wb.youngGC(); | |
| 76 } | |
| 77 // Clear the garbage and reference list. | |
| 78 garbageAndRefList.clear(); | |
| 79 | |
| 80 // Run a concurrent mark cycle to mark all references but the static one as dead. | |
| 81 wb.g1StartConcMarkCycle(); | |
| 82 while (wb.g1InConcurrentMark()) { | |
| 83 Thread.sleep(100); | |
| 84 } | |
| 85 | |
| 86 // Run a young collection to make sure humongous object still can't be eagerly reclaimed. | |
| 87 wb.youngGC(); | |
| 88 // Will crash/assert if humongous object has been reclaimed. | |
| 89 wb.fullGC(); | |
| 90 } | |
| 91 } |
