1 /* 2 * Copyright (c) 2019, 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 26 * @bug 8139551 27 * @summary Scalability problem with redefinition - multiple code cache walks 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * @modules java.compiler 31 * java.instrument 32 * jdk.jartool/sun.tools.jar 33 * @run main RedefineClassHelper 34 * @run main/othervm/timeout=180 -javaagent:redefineagent.jar -XX:CompileThreshold=100 -Xlog:redefine+class+nmethod=debug TestMultipleClasses 35 */ 36 37 import java.lang.instrument.*; 38 import java.lang.reflect.*; 39 import jdk.test.lib.compiler.InMemoryJavaCompiler; 40 41 public class TestMultipleClasses extends ClassLoader { 42 43 public static String B(int count) { 44 return new String("public class B" + count + " {" + 45 " public static void compiledMethod() { " + 46 " try{" + 47 " Thread.sleep(1); " + 48 " } catch(InterruptedException ie) {" + 49 " }" + 50 " }" + 51 "}"); 52 } 53 54 static String newB(int count) { 55 return new String("public class B" + count + " {" + 56 " public static void compiledMethod() { " + 57 " System.out.println(\"compiledMethod called " + count + "\");" + 58 " }" + 59 "}"); 60 } 61 62 static int index = 0; 63 64 @Override 65 protected Class<?> findClass(String name) throws ClassNotFoundException { 66 if (name.equals("B" + index)) { 67 byte[] b = InMemoryJavaCompiler.compile(name, B(index)); 68 return defineClass(name, b, 0, b.length); 69 } else { 70 return super.findClass(name); 71 } 72 } 73 74 static void runCompiledMethodMethods(Class c, int count) throws Exception { 75 // Run for a while so they compile. 76 Object o = c.newInstance(); 77 Method m = c.getMethod("compiledMethod"); 78 for (int i = 0; i < count; i++) { 79 m.invoke(o); 80 } 81 } 82 83 public static void main(String[] args) throws Exception { 84 85 final int numberOfClasses = 20; 86 Class[] classes = new Class[numberOfClasses]; 87 byte[][] newClass = new byte[numberOfClasses][]; 88 ClassDefinition[] defs = new ClassDefinition[numberOfClasses]; 89 90 TestMultipleClasses loader = new TestMultipleClasses(); 91 92 // Load and start all the classes. 93 for (index = 0; index < numberOfClasses; index++) { 94 String name = new String("B" + index); 95 Class c = loader.findClass(name); 96 97 runCompiledMethodMethods(c, 500); 98 // Make class definition for redefinition 99 classes[index] = c; 100 newClass[index] = InMemoryJavaCompiler.compile(c.getName(), newB(index)); 101 defs[index] = new ClassDefinition(c, newClass[index]); 102 } 103 104 long startTime = System.currentTimeMillis(); 105 106 // Redefine all classes. 107 RedefineClassHelper.instrumentation.redefineClasses(defs); 108 109 long endTime = System.currentTimeMillis(); 110 111 System.out.println("Redefinition took " + (endTime - startTime) + " milliseconds"); 112 113 System.gc(); 114 115 // Run all new classes. 116 for (index = 0; index < numberOfClasses; index++) { 117 runCompiledMethodMethods(classes[index], 1); 118 } 119 } 120 }