137 lines
5.3 KiB
Java
137 lines
5.3 KiB
Java
/*
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* Copyright (c) 2015, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.g1.humongousObjects;
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import gc.testlibrary.Helpers;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.Utils;
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import jdk.test.whitebox.WhiteBox;
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import java.io.PrintStream;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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import java.util.stream.Collectors;
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/**
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* @test TestHumongousMovement
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* @key randomness
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* @summary Checks that Humongous objects are not moved during GC
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* @requires vm.gc.G1
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* @library /test/lib /
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* @modules java.base/jdk.internal.misc
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* @modules java.management
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
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* -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:InitiatingHeapOccupancyPercent=100
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* -Xlog:gc=info:file=TestHumongousMovement.log
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* gc.g1.humongousObjects.TestHumongousMovement
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*/
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public class TestHumongousMovement {
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private static class AllocationData {
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private final byte[] allocation;
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public final BigInteger objectAddress;
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public AllocationData(byte[] byteArray) {
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allocation = byteArray;
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objectAddress = new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation))));
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}
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public boolean isAddressChanged() {
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return !new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation)))).equals(objectAddress);
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}
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public void printDetails(PrintStream out) {
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BigInteger objectAddressAfterGC =
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new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation))));
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out.println(String.format("Object stored address = %d\nObject address after GC = %d\n"
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+ "They are %sequals", objectAddress,
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objectAddressAfterGC, !objectAddress.equals(objectAddressAfterGC) ? "not " : ""));
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}
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}
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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// How many allocated humongous objects should be deleted
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private static final double HUMONGOUS_OBJECTS_DELETED_FACTOR = 0.5D;
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// How many of free g1 regions should be used for humongous allocations
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private static final double ALLOCATED_HUMONGOUS_REGIONS_FACTOR = 0.25D;
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public static void main(String[] args) {
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int g1RegionSize = WB.g1RegionSize();
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int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead();
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System.out.println("Total " + WB.g1NumMaxRegions() + " regions");
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System.out.println("Total " + WB.g1NumFreeRegions() + " free regions");
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int regionsToAllocate = (int) (WB.g1NumFreeRegions() * ALLOCATED_HUMONGOUS_REGIONS_FACTOR);
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// Sanity check
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Asserts.assertGreaterThan(regionsToAllocate, 0, "Test Bug: no regions to allocate");
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System.out.println("Allocating " + regionsToAllocate + " humongous objects, each 90% of g1 region size");
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List<AllocationData> allocations = new ArrayList<>();
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// 90 % of maximum byte[] that takes one region
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int hSize = (int) ((g1RegionSize - byteArrayMemoryOverhead) * 0.9);
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// Sanity check
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Asserts.assertGreaterThan(hSize, g1RegionSize / 2, "Test Bug: allocation size is not humongous");
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for (int i = 0; i < regionsToAllocate; ++i) {
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allocations.add(new AllocationData(new byte[hSize]));
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}
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Random rnd = Utils.getRandomInstance();
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int toDelete = (int) (allocations.size() * HUMONGOUS_OBJECTS_DELETED_FACTOR);
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for (int i = 0; i < toDelete; ++i) {
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allocations.remove(rnd.nextInt(allocations.size()));
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}
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WB.fullGC();
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List<AllocationData> movedObjects = allocations.stream()
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.filter(AllocationData::isAddressChanged)
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.collect(Collectors.toList());
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if (movedObjects.size() > 0) {
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System.out.println("Test failed - some humongous objects moved after Full GC");
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movedObjects.stream().forEach(a -> a.printDetails(System.out));
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throw new Error("Test failed - some humongous objects moved after Full GC");
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} else {
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System.out.println("Passed");
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}
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}
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}
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