Mercurial > hg > graal-jvmci-8
view test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java @ 23891:34429bad9986 jdk8u101-b02
Merge
author | asaha |
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date | Mon, 04 Apr 2016 12:18:28 -0700 |
parents | f3f2f71d2dc8 |
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/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test TestNoEagerReclaimOfHumongousRegions * @bug 8139424 * @summary Test to check that a live humongous object is not eagerly reclaimed. This is a regression test for * 8139424 and the test will crash if an eager reclaim occur. The test is not 100% deterministic and * might pass even if there are problems in the code, but it will never crash unless there is a problem. * @requires vm.gc=="G1" | vm.gc=="null" * @key gc * @library /testlibrary /testlibrary/whitebox * @modules java.base/sun.misc * @build TestNoEagerReclaimOfHumongousRegions * @run main ClassFileInstaller sun.hotspot.WhiteBox * sun.hotspot.WhiteBox$WhiteBoxPermission * @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 */ import java.util.LinkedList; import sun.hotspot.WhiteBox; public class TestNoEagerReclaimOfHumongousRegions { // Helper class to keep reference to humongous byte[]. static class LargeRef { private byte[] _ref; LargeRef(byte[] ref) { _ref = ref; } byte[] ref() { return _ref; } } static LargeRef humongous_reference_holder; public static void main(String[] args) throws InterruptedException{ WhiteBox wb = WhiteBox.getWhiteBox(); LinkedList<Object> garbageAndRefList = new LinkedList<Object>(); // Creating a 1M large byte array. Since the test specifies the heap // region size to be 1m this will be a humongous object. We then // store a pointer to the array in the static object to keep it live // during the whole test. humongous_reference_holder = new LargeRef(new byte[1 * 1024 * 1024]); // Create some garbage and a reference to the humongous object each round. for (int i = 0; i < 32; i++) { garbageAndRefList.add(new byte[400*1000]); garbageAndRefList.add(new LargeRef(humongous_reference_holder.ref())); // Promote to old, goal is to get rem-set entries for the humongous // object from different regions. The test specifies MaxTenuringThreshold=0, // this will make sure we get objects promoted to old at once. wb.youngGC(); } // Clear the garbage and reference list. garbageAndRefList.clear(); // Run a concurrent mark cycle to mark all references but the static one as dead. wb.g1StartConcMarkCycle(); while (wb.g1InConcurrentMark()) { Thread.sleep(100); } // Run a young collection to make sure humongous object still can't be eagerly reclaimed. wb.youngGC(); // Will crash/assert if humongous object has been reclaimed. wb.fullGC(); } }