| /* |
| * Copyright (c) 2015, 2018, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 jdk.jfr.event.gc.stacktrace; |
| |
| import javax.management.MBeanServer; |
| import java.lang.management.ManagementFactory; |
| import com.sun.management.GarbageCollectorMXBean; |
| |
| import jdk.jfr.Recording; |
| import jdk.jfr.consumer.RecordedEvent; |
| import jdk.jfr.consumer.RecordedStackTrace; |
| import jdk.jfr.consumer.RecordedFrame; |
| import jdk.jfr.consumer.RecordedMethod; |
| import jdk.jfr.consumer.RecordedThread; |
| import jdk.test.lib.jfr.EventNames; |
| import jdk.test.lib.jfr.Events; |
| |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| |
| abstract class MemoryAllocator { |
| |
| public static final int KB = 1024; |
| public static final int MB = 1024 * KB; |
| |
| public static Object garbage = null; |
| |
| abstract public void allocate(); |
| public void clear() { |
| garbage = null; |
| } |
| } |
| |
| class EdenMemoryAllocator extends MemoryAllocator { |
| |
| @Override |
| public void allocate() { |
| garbage = new byte[10 * KB]; |
| } |
| } |
| |
| class HumongousMemoryAllocator extends MemoryAllocator { |
| |
| @Override |
| public void allocate() { |
| garbage = new byte[5 * MB]; |
| } |
| } |
| |
| /** |
| * Attempts to fill up young gen and allocate in old gen |
| */ |
| class OldGenMemoryAllocator extends MemoryAllocator { |
| |
| private List<byte[]> list = new ArrayList<byte[]>(); |
| private int counter = 6000; |
| |
| @Override |
| public void allocate() { |
| if (counter-- > 0) { |
| list.add(new byte[10 * KB]); |
| } else { |
| list = new ArrayList<byte[]>(); |
| counter = 6000; |
| } |
| |
| garbage = list; |
| } |
| |
| @Override |
| public void clear(){ |
| list = null; |
| super.clear(); |
| } |
| } |
| |
| class MetaspaceMemoryAllocator extends MemoryAllocator { |
| |
| private static int counter = 0; |
| |
| /** |
| * 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. |
| */ |
| static protected void loadNewClass() { |
| try { |
| String jarUrl = "file:" + (counter++) + ".jar"; |
| URL[] urls = new URL[]{new URL(jarUrl)}; |
| URLClassLoader cl = new URLClassLoader(urls); |
| Proxy.newProxyInstance( |
| cl, |
| new Class[]{Foo.class}, |
| new FooInvocationHandler(new FooBar())); |
| } catch (java.net.MalformedURLException badThing) { |
| // should never occur |
| System.err.println("Unexpected error: " + badThing); |
| throw new RuntimeException(badThing); |
| } |
| } |
| |
| @Override |
| public void allocate() { |
| try { |
| loadNewClass(); |
| } catch (OutOfMemoryError e) { |
| /* empty */ |
| } |
| } |
| |
| public static interface Foo { |
| } |
| |
| public static class FooBar implements Foo { |
| } |
| |
| static class FooInvocationHandler implements InvocationHandler { |
| |
| private final Foo foo; |
| |
| FooInvocationHandler(Foo foo) { |
| this.foo = foo; |
| } |
| |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| return method.invoke(foo, args); |
| } |
| } |
| } |
| |
| /** |
| * Utility class to peform JFR recording, GC provocation/detection and |
| * stacktrace verification for related JFR events |
| */ |
| public class AllocationStackTrace { |
| |
| /** |
| * Tests event stacktrace for young GC if -XX:+UseSerialGC is used |
| */ |
| public static void testDefNewAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("Copy"); |
| MemoryAllocator memory = new EdenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testDefNewAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for old GC if -XX:+UseSerialGC is used |
| */ |
| public static void testMarkSweepCompactAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("MarkSweepCompact"); |
| MemoryAllocator memory = new OldGenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testMarkSweepCompactAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace during metaspace GC threshold if -XX:+UseSerialGC |
| * is used |
| */ |
| public static void testMetaspaceSerialGCAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("MarkSweepCompact"); |
| MemoryAllocator memory = new MetaspaceMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testMetaspaceSerialGCAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for young GC if -XX:+UseConcMarkSweepGC is used |
| */ |
| public static void testParNewAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("ParNew"); |
| MemoryAllocator memory = new EdenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testParNewAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for old GC if -XX:+UseConcMarkSweepGC is used |
| */ |
| public static void testConcMarkSweepAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("ConcurrentMarkSweep"); |
| MemoryAllocator memory = new OldGenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testConcMarkSweepAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace during metaspace GC threshold if |
| * -XX:+UseConcMarkSweepGC is used |
| */ |
| public static void testMetaspaceConcMarkSweepGCAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("ConcurrentMarkSweep"); |
| MemoryAllocator memory = new MetaspaceMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testMetaspaceConcMarkSweepGCAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for young GC if -XX:+UseParallelGC is used |
| */ |
| public static void testParallelScavengeAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("PS Scavenge"); |
| MemoryAllocator memory = new EdenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testParallelScavengeAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for old GC if -XX:+UseParallelGC is used |
| */ |
| public static void testParallelMarkSweepAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("PS MarkSweep"); |
| MemoryAllocator memory = new OldGenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testParallelMarkSweepAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace during metaspace GC threshold if |
| * -XX:+UseParallelGC is used |
| */ |
| public static void testMetaspaceParallelGCAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("PS MarkSweep"); |
| MemoryAllocator memory = new MetaspaceMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testMetaspaceParallelGCAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for young GC if -XX:+UseG1GC is used |
| */ |
| public static void testG1YoungAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("G1 Young Generation"); |
| MemoryAllocator memory = new EdenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testG1YoungAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for old GC if -XX:+UseG1GC is used |
| */ |
| public static void testG1OldAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("G1 Old Generation"); |
| MemoryAllocator memory = new OldGenMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testG1OldAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace during metaspace GC threshold if -XX:+UseG1GC is |
| * used |
| */ |
| public static void testMetaspaceG1GCAllocEvent() throws Exception { |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("G1 Young Generation"); |
| MemoryAllocator memory = new MetaspaceMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testMetaspaceG1GCAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| /** |
| * Tests event stacktrace for GC caused by humongous allocations if |
| * -XX:+UseG1GC is used |
| */ |
| public static void testG1HumonAllocEvent() throws Exception { |
| // G1 tries to reclaim humongous objects at every young collection |
| // after doing a conservative estimate of its liveness |
| GarbageCollectorMXBean bean = garbageCollectorMXBean("G1 Young Generation"); |
| MemoryAllocator memory = new HumongousMemoryAllocator(); |
| |
| String[] expectedStack = new String[]{ |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testAllocEvent", |
| "jdk.jfr.event.gc.stacktrace.AllocationStackTrace.testG1HumonAllocEvent" |
| }; |
| |
| testAllocEvent(bean, memory, expectedStack); |
| } |
| |
| private static GarbageCollectorMXBean garbageCollectorMXBean(String name) throws Exception { |
| MBeanServer server = ManagementFactory.getPlatformMBeanServer(); |
| GarbageCollectorMXBean bean = ManagementFactory.newPlatformMXBeanProxy( |
| server, "java.lang:type=GarbageCollector,name=" + name, GarbageCollectorMXBean.class); |
| return bean; |
| } |
| |
| /** |
| * Performs JFR recording, GC provocation/detection and stacktrace |
| * verification for JFR event. In case of verification failure |
| * repeats several times. |
| * |
| * @param bean MX bean for desired GC |
| * @param memory allocator for desired type of allocations |
| * @param expectedStack array of expected frames |
| */ |
| private static void testAllocEvent(GarbageCollectorMXBean bean, MemoryAllocator memory, String[] expectedStack) throws Exception { |
| // The test checks the stacktrace of events and expects all the events are fired |
| // in the current thread. But compilation may also trigger GC. |
| // So to filter out such cases the test performs several iterations and expects |
| // that the memory allocations made by the test will produce the desired JFR event. |
| final int iterations = 5; |
| for (int i = 0; i < iterations; i++) { |
| if (allocAndCheck(bean, memory, expectedStack)) { |
| return; |
| } else { |
| System.out.println("Attempt: " + i + " out of " + iterations+": no matching stack trace found."); |
| } |
| memory.clear(); |
| } |
| throw new AssertionError("No matching stack trace found"); |
| } |
| |
| /** |
| * Performs JFR recording, GC provocation/detection and stacktrace |
| * verification for JFR event. |
| * |
| * @param bean MX bean for desired GC |
| * @param memory allocator for desired type of allocations |
| * @param expectedStack array of expected frames |
| * @throws Exception |
| */ |
| private static boolean allocAndCheck(GarbageCollectorMXBean bean, MemoryAllocator memory, |
| String[] expectedStack) throws Exception { |
| String threadName = Thread.currentThread().getName(); |
| String event = EventNames.AllocationRequiringGC; |
| |
| Recording r = new Recording(); |
| r.enable(event).withStackTrace(); |
| r.start(); |
| |
| long prevCollectionCount = bean.getCollectionCount(); |
| long collectionCount = -1; |
| |
| long iterationCount = 0; |
| |
| do { |
| memory.allocate(); |
| collectionCount = bean.getCollectionCount(); |
| iterationCount++; |
| } while (collectionCount == prevCollectionCount); |
| |
| System.out.println("Allocation num: " + iterationCount); |
| System.out.println("GC detected: " + collectionCount); |
| |
| r.stop(); |
| List<RecordedEvent> events = Events.fromRecording(r); |
| |
| System.out.println("JFR GC events found: " + events.size()); |
| |
| // Find any event that matched the expected stack trace |
| for (RecordedEvent e : events) { |
| System.out.println("Event: " + e); |
| RecordedThread thread = e.getThread(); |
| String eventThreadName = thread.getJavaName(); |
| if (!threadName.equals(eventThreadName)) { |
| continue; |
| } |
| if (matchingStackTrace(e.getStackTrace(), expectedStack)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private static boolean matchingStackTrace(RecordedStackTrace stack, String[] expectedStack) { |
| if (stack == null) { |
| return false; |
| } |
| |
| List<RecordedFrame> frames = stack.getFrames(); |
| int pos = findFramePos(frames, expectedStack[0]); |
| |
| if (pos == -1) { |
| return false; |
| } |
| |
| for (String expectedFrame : expectedStack) { |
| RecordedFrame f = frames.get(pos++); |
| String frame = frameToString(f); |
| |
| if (!frame.equals(expectedFrame)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| private static int findFramePos(List<RecordedFrame> frames, String frame) { |
| int pos = 0; |
| |
| for (RecordedFrame f : frames) { |
| if (frame.equals(frameToString(f))) { |
| return pos; |
| } |
| pos++; |
| } |
| |
| return -1; |
| } |
| |
| private static String frameToString(RecordedFrame f) { |
| RecordedMethod m = f.getMethod(); |
| String methodName = m.getName(); |
| String className = m.getType().getName(); |
| return className + "." + methodName; |
| } |
| |
| } |