1 /* 2 * Copyright (c) 2010, 2020, 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 * This test stress RememberetSet procerssing in the G1 by creation of references 25 * between different 1MB blocks. 26 * Test is specific for G1, for other GCs it should just pass. 27 */ 28 29 30 /* 31 * @test 32 * @modules java.base/jdk.internal.misc:+open java.base/jdk.internal.vm.annotation:+open java.base/sun.reflect.annotation:+open 33 * @key stress 34 * 35 * @summary converted from VM Testbase gc/gctests/RememberedSet. 36 * VM Testbase keywords: [gc, stress, stressopt, feature_g1, nonconcurrent] 37 * 38 * @library /vmTestbase 39 * /test/lib 40 * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.RememberedSet.RememberedSet 41 */ 42 43 package gc.gctests.RememberedSet; 44 45 import java.lang.reflect.Field; 46 import java.util.ArrayList; 47 import java.util.List; 48 import nsk.share.gc.GC; 49 import nsk.share.gc.MemoryObject; 50 import nsk.share.gc.ThreadedGCTest; 51 import nsk.share.test.ExecutionController; 52 import jdk.internal.misc.Unsafe; 53 54 public class RememberedSet extends ThreadedGCTest { 55 56 static class PointerUtils { 57 private static Unsafe unsafe; 58 private static long fieldOffset; 59 private static PointerUtils instance = new PointerUtils(); 60 private static boolean compressedRef = false; 61 62 static { 63 try { 64 unsafe = Unsafe.getUnsafe(); 65 fieldOffset = unsafe.objectFieldOffset(PointerUtils.class.getDeclaredField("obj")); 66 long fieldOffset0 = unsafe.objectFieldOffset(PointerUtils.class.getDeclaredField("obj0")); 67 int oopSize = (int)Math.abs(fieldOffset - fieldOffset0); 68 69 if (oopSize != unsafe.addressSize()) { 70 System.out.println("Compressed oops detected"); 71 compressedRef = true; 72 } 73 } catch (Exception ex) { 74 throw new RuntimeException(ex); 75 } 76 } 77 78 private Object obj; 79 private Object obj0; 80 toAddress(Object o)81 public synchronized static long toAddress(Object o) { 82 long address; 83 instance.obj = o; 84 85 if (compressedRef || unsafe.addressSize() == 4) { 86 address = unsafe.getInt(instance, fieldOffset); 87 } 88 else { 89 address = unsafe.getLong(instance, fieldOffset); 90 } 91 92 return address; 93 } 94 95 } 96 private ExecutionController stresser; 97 98 @Override createRunnable(int i)99 protected Runnable createRunnable(int i) { 100 return new Worker(); 101 } 102 103 class Worker implements Runnable { 104 105 static final long BLOCK_SIZE = 1024 * 1024; 106 107 108 // this method tries to allocate a new MemoryObject 109 // which is in another 1MB block getOutOfTheBlockObject(int size, Object obj)110 MemoryObject getOutOfTheBlockObject(int size, Object obj) { 111 long address = PointerUtils.toAddress(obj); 112 MemoryObject ref = new MemoryObject(size); 113 int attempt = (int) (BLOCK_SIZE / size); 114 while (attempt != 0 && Math.abs(address - PointerUtils.toAddress(ref)) < BLOCK_SIZE) { 115 ref = new MemoryObject(size); 116 attempt--; 117 } 118 return ref; 119 } 120 121 @Override run()122 public void run() { 123 124 int size = (int) Math.sqrt(BLOCK_SIZE); 125 int refsCount = (int) (runParams.getTestMemory() / BLOCK_SIZE); 126 int count = (int) (runParams.getTestMemory() / runParams.getNumberOfThreads() / (refsCount * size)); 127 // Each cycle 10% of references and 10% of arrays are reallocated 128 int step = 10; 129 130 List<List<MemoryObject>> objs = new ArrayList<List<MemoryObject>>(count); 131 for (int i = 0; i < count; i++) { 132 List<MemoryObject> obj = new ArrayList<MemoryObject>(); 133 objs.add(obj); 134 for (int j = 0; j < refsCount; j++) { 135 obj.add(getOutOfTheBlockObject(size, obj)); 136 } 137 } 138 if (stresser == null) { 139 stresser = getExecutionController(); 140 } 141 int shift = 0; 142 while (stresser.continueExecution()) { 143 for (int j = shift; j < refsCount; j += step) { 144 for (int i = 0; i < count; i ++) { 145 // update each 10th reference to allow GC previous one 146 List<MemoryObject> obj = objs.get(i); 147 obj.set(j, getOutOfTheBlockObject(size, obj)); 148 } 149 } 150 for (int i = step - shift; i < count; i += step) { 151 // update each 10th array of references 152 // to allocate it in the another 1MB block (as new young object) 153 List<MemoryObject> obj = new ArrayList<MemoryObject>(); 154 objs.set(i, obj); 155 for (int j = 0; j < refsCount; j++) { 156 obj.add(getOutOfTheBlockObject(size, obj)); 157 } 158 } 159 // shift is changed from 0 to step - 1 160 log.debug("shift = " + shift); 161 shift = (shift + 1) % step; 162 } 163 } 164 } 165 main(String[] args)166 public static void main(String[] args) { 167 GC.runTest(new RememberedSet(), args); 168 } 169 } 170