| /* |
| * Copyright (c) 2013, 2019, 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 |
| * |
| * @bug 8217432 |
| * @summary converted from VM Testbase metaspace/shrink_grow/ShrinkGrowTest. |
| * |
| * @requires vm.opt.final.ClassUnloading |
| * @library /vmTestbase /test/lib |
| * @run driver jdk.test.lib.FileInstaller . . |
| * @run main/othervm |
| * -XX:MetaspaceSize=10m |
| * -XX:MaxMetaspaceSize=20m |
| * -Xlog:gc*:gc.log |
| * metaspace.shrink_grow.ShrinkGrowTest.ShrinkGrowTest |
| */ |
| |
| package metaspace.shrink_grow.ShrinkGrowTest; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryPoolMXBean; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * This is the main test in the metaspace shrink/grow series. |
| * |
| * It tries to allocate all available metespace (loads new classes and keeps |
| * them in map), then checks that loading new classes causes OOM. |
| * After that it does cleanup loaded classes and then expect the new classes |
| * could be loaded again. |
| * |
| * <b>Note</b>: Don't forget to limit the metaspace size by giving |
| * -XX:MaxMetaspaceSize=100k vm option. |
| */ |
| public class ShrinkGrowTest { |
| |
| /** |
| * Dead classes storage. |
| */ |
| private final Map<String, ShrinkGrowTest.Foo> loadedClasses = new HashMap<>(); |
| |
| private static int counter = 0; |
| |
| private String errorMessage = "not completed"; |
| |
| // thread id to distinguish threads in output |
| private final String whoAmI; |
| |
| // the limit of classes to load expecting OOM |
| private final int maxClassesToLoad; |
| |
| public static void main(String[] args) { |
| String name = args.length > 0 ? args[0] : "singleTest" ; |
| new ShrinkGrowTest(name, 20000).run(); |
| } |
| |
| /** |
| * @param name - thread id used in logging |
| * @param classesToLoad - the limit of classes to load expecting OOM |
| */ |
| public ShrinkGrowTest(String name, int classesToLoad) { |
| whoAmI = name; |
| maxClassesToLoad = classesToLoad; |
| |
| } |
| |
| /** |
| * Just outputs given message preceeded with the thread identifier |
| * |
| * @param message text to print out |
| */ |
| void log(String message) { |
| System.out.println("%" + whoAmI + "% " + message); |
| } |
| |
| void throwFault(String message) { |
| throw new TestFault("%" + whoAmI + "% " + message); |
| } |
| |
| void throwFault(String message, Throwable t) { |
| throw new TestFault("%" + whoAmI + "% " + message, t); |
| } |
| |
| /** |
| * Entry to the test. |
| * Just exits if passes or throws an Error if failed. |
| */ |
| public void run() { |
| if (System.getProperty("requiresCompressedClassSpace") != null && |
| !isCompressedClassSpaceAvailable()) { |
| System.out.println("Not applicalbe, Compressed Class Space is required"); |
| return; |
| } |
| |
| try { |
| log("Bootstrapping string concatenation for " + whoAmI ); |
| go(); |
| // The quest completed! Yahoo! |
| setErrorMessage(null); |
| log("passed"); |
| } catch (TestFault failure) { |
| failure.printStackTrace(System.err); |
| setErrorMessage(failure.getMessage()); |
| log("failed :" + errorMessage); |
| throw failure; |
| } catch (Throwable badThing) { |
| setErrorMessage(badThing.toString()); |
| throw new TestFault(badThing); |
| } |
| } |
| |
| private void go() { |
| // step 1: eat all metaspace |
| log("eating metaspace"); |
| runOutOfMetaspace(maxClassesToLoad); |
| |
| // step 2: try to load one more class |
| // it should be impossible |
| try { |
| eatALittleMemory(); |
| throwFault("We haven't cleaned metaspace yet!"); |
| } catch (OutOfMemoryError error) { |
| if (!isMetaspaceError(error)) { |
| throwFault("Hmm, we ran out metaspace. Metaspace error is still excpected here " + error, error); |
| } |
| } |
| |
| // step 3: clean up metaspace and try loading a class again. |
| log("washing hands before meal"); |
| loadedClasses.clear(); |
| System.gc(); |
| try { |
| log("one more try to eat"); |
| eatALittleMemory(); |
| } catch (OutOfMemoryError error) { |
| throwFault("we already should be able to consume metaspace " + error, error); |
| } |
| } |
| |
| /** |
| * @return true if the test has successfully passed. |
| */ |
| public boolean isPassed() { |
| return errorMessage == null; |
| } |
| |
| /** |
| * @return message describing the reason of failure, or null if passes |
| */ |
| public String getErrorMessage() { |
| return errorMessage; |
| } |
| |
| /** |
| * Sets the message describing why test failed, or null if test passed |
| */ |
| void setErrorMessage(String msg) { |
| errorMessage = msg; |
| } |
| |
| /** |
| * Loads new classes until OOM. |
| * Checks that OOM is caused by metaspace and throws an Error if not. |
| * |
| * @param times - maximum limit of classes to load. |
| */ |
| private void runOutOfMetaspace(int times) { |
| try { |
| for (int i = 0; i < times; i++) { |
| eatALittleMemory(); |
| } |
| } catch (OutOfMemoryError error) { |
| if (isMetaspaceError(error)) { |
| return; |
| } |
| throwFault("We ran out of another space, not metaspace: " + error, error); |
| } |
| throwFault("OOM hasn't happened after " + times + " iterations. Might be too much space?.."); |
| } |
| |
| /** |
| * Imitates class loading. |
| * Each invocation of this method causes a new class loader object is created |
| * and a new class is loaded by this class loader. |
| * Method throws OOM when run out of memory. |
| */ |
| private void eatALittleMemory() { |
| try { |
| String jarUrl = "file:" + counter + ".jar"; |
| counter++; |
| URL[] urls = new URL[]{new URL(jarUrl)}; |
| URLClassLoader cl = new URLClassLoader(urls); |
| ShrinkGrowTest.Foo foo = (ShrinkGrowTest.Foo) Proxy.newProxyInstance(cl, |
| new Class[]{ShrinkGrowTest.Foo.class}, |
| new ShrinkGrowTest.FooInvocationHandler(new ShrinkGrowTest.FooBar())); |
| loadedClasses.put(jarUrl, foo); |
| } catch (java.net.MalformedURLException badThing) { |
| // should never occur |
| throwFault("Unexpeted error: " + badThing, badThing); |
| } |
| |
| } |
| |
| /** |
| * Checks if given OOM is about metaspace |
| * @param error OOM |
| * @return true if message contains 'metaspace' word, false otherwise. |
| */ |
| boolean isMetaspaceError(OutOfMemoryError error) { |
| String message = error.getMessage(); |
| return message != null && (message.contains("Metaspace") || |
| message.contains("Compressed class space")); |
| } |
| |
| boolean isCompressedClassSpaceAvailable() { |
| for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) { |
| if (pool.getName().equalsIgnoreCase("Compressed class space")) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Runtime exception signaling test failure. |
| */ |
| public static class TestFault extends RuntimeException { |
| public TestFault(String message) { |
| super(message); |
| } |
| public TestFault(Throwable t) { |
| super(t); |
| } |
| public TestFault(String message, Throwable t) { |
| super(message, t); |
| } |
| } |
| |
| public static interface Foo { |
| } |
| |
| public static class FooBar implements ShrinkGrowTest.Foo { |
| } |
| |
| class FooInvocationHandler implements InvocationHandler { |
| private final ShrinkGrowTest.Foo foo; |
| |
| FooInvocationHandler(ShrinkGrowTest.Foo foo) { |
| this.foo = foo; |
| } |
| |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| return method.invoke(foo, args); |
| } |
| } |
| } |