| /* |
| * Copyright (c) 2015, 2016, 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. |
| */ |
| |
| package gc.g1.humongousObjects; |
| |
| import gc.testlibrary.Helpers; |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.Utils; |
| import sun.hotspot.WhiteBox; |
| |
| import java.io.PrintStream; |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| import java.util.stream.Collectors; |
| |
| /** |
| * @test TestHumongousMovement |
| * @summary Checks that Humongous objects are not moved during GC |
| * @requires vm.gc.G1 |
| * @library /test/lib / |
| * @modules java.base/jdk.internal.misc |
| * @modules java.management |
| * @build sun.hotspot.WhiteBox |
| * @run driver ClassFileInstaller sun.hotspot.WhiteBox |
| * sun.hotspot.WhiteBox$WhiteBoxPermission |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:InitiatingHeapOccupancyPercent=100 |
| * -Xlog:gc=info:file=TestHumongousMovement.log |
| * gc.g1.humongousObjects.TestHumongousMovement |
| */ |
| |
| public class TestHumongousMovement { |
| |
| private static class AllocationData { |
| private final byte[] allocation; |
| public final BigInteger objectAddress; |
| |
| public AllocationData(byte[] byteArray) { |
| allocation = byteArray; |
| objectAddress = new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation)))); |
| } |
| |
| public boolean isAddressChanged() { |
| return !new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation)))).equals(objectAddress); |
| } |
| |
| public void printDetails(PrintStream out) { |
| BigInteger objectAddressAfterGC = |
| new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation)))); |
| |
| out.println(String.format("Object stored address = %d\nObject address after GC = %d\n" |
| + "They are %sequals", objectAddress, |
| objectAddressAfterGC, !objectAddress.equals(objectAddressAfterGC) ? "not " : "")); |
| } |
| |
| } |
| |
| private static final WhiteBox WB = WhiteBox.getWhiteBox(); |
| |
| // How many allocated humongous objects should be deleted |
| private static final double HUMONGOUS_OBJECTS_DELETED_FACTOR = 0.5D; |
| // How many of free g1 regions should be used for humongous allocations |
| private static final double ALLOCATED_HUMONGOUS_REGIONS_FACTOR = 0.25D; |
| |
| public static void main(String[] args) { |
| |
| int g1RegionSize = WB.g1RegionSize(); |
| int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead(); |
| |
| System.out.println("Total " + WB.g1NumMaxRegions() + " regions"); |
| System.out.println("Total " + WB.g1NumFreeRegions() + " free regions"); |
| |
| int regionsToAllocate = (int) (WB.g1NumFreeRegions() * ALLOCATED_HUMONGOUS_REGIONS_FACTOR); |
| |
| // Sanity check |
| Asserts.assertGreaterThan(regionsToAllocate, 0, "Test Bug: no regions to allocate"); |
| |
| System.out.println("Allocating " + regionsToAllocate + " humongous objects, each 90% of g1 region size"); |
| |
| List<AllocationData> allocations = new ArrayList<>(); |
| |
| // 90 % of maximum byte[] that takes one region |
| int hSize = (int) ((g1RegionSize - byteArrayMemoryOverhead) * 0.9); |
| |
| // Sanity check |
| Asserts.assertGreaterThan(hSize, g1RegionSize / 2, "Test Bug: allocation size is not humongous"); |
| |
| for (int i = 0; i < regionsToAllocate; ++i) { |
| allocations.add(new AllocationData(new byte[hSize])); |
| } |
| |
| Random rnd = Utils.getRandomInstance(); |
| |
| int toDelete = (int) (allocations.size() * HUMONGOUS_OBJECTS_DELETED_FACTOR); |
| |
| for (int i = 0; i < toDelete; ++i) { |
| allocations.remove(rnd.nextInt(allocations.size())); |
| } |
| |
| WB.fullGC(); |
| |
| List<AllocationData> movedObjects = allocations.stream() |
| .filter(AllocationData::isAddressChanged) |
| .collect(Collectors.toList()); |
| |
| if (movedObjects.size() > 0) { |
| System.out.println("Test failed - some humongous objects moved after Full GC"); |
| movedObjects.stream().forEach(a -> a.printDetails(System.out)); |
| throw new Error("Test failed - some humongous objects moved after Full GC"); |
| } else { |
| System.out.println("Passed"); |
| } |
| } |
| } |