--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/event/compiler/TestAllocInNewTLAB.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2013, 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.compiler;
+
+import static java.lang.Math.floor;
+import static jdk.test.lib.Asserts.assertGreaterThanOrEqual;
+import static jdk.test.lib.Asserts.assertLessThanOrEqual;
+
+import java.time.Duration;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.test.lib.jfr.EventNames;
+import jdk.test.lib.jfr.Events;
+
+/*
+ * @test
+ * @summary Test that event is triggered when an object is allocated in a new TLAB.
+ * @key jfr
+ * @library /test/lib
+ * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 jdk.jfr.event.compiler.TestAllocInNewTLAB
+ * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -XX:-FastTLABRefill jdk.jfr.event.compiler.TestAllocInNewTLAB
+ * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -Xint jdk.jfr.event.compiler.TestAllocInNewTLAB
+ */
+
+/**
+ * Test that when an object is allocated in a new Thread Local Allocation Buffer (TLAB)
+ * an event will be triggered. The test is done for C1-compiler,
+ * C2-compiler (-XX:-FastTLABRefill) and interpreted mode (-Xint).
+ *
+ * To force objects to be allocated in a new TLAB:
+ * the size of TLAB is set to 100k (-XX:TLABSize=100k);
+ * the size of allocated objects is set to 100k minus 16 bytes overhead;
+ * max TLAB waste at refill is set to minimum (-XX:TLABRefillWasteFraction=1),
+ * to provoke a new TLAB creation.
+ */
+public class TestAllocInNewTLAB {
+ private final static String EVENT_NAME = EventNames.ObjectAllocationInNewTLAB;
+
+ private static final int BYTE_ARRAY_OVERHEAD = 16; // Extra bytes used by a byte array.
+ private static final int OBJECT_SIZE = 100 * 1024;
+ private static final int OBJECT_SIZE_ALT = OBJECT_SIZE + 8; // Object size in case of disabled CompressedOops
+ private static final int OBJECTS_TO_ALLOCATE = 100;
+ private static final String BYTE_ARRAY_CLASS_NAME = new byte[0].getClass().getName();
+ private static final int INITIAL_TLAB_SIZE = 100 * 1024;
+
+ // make sure allocation isn't dead code eliminated
+ public static byte[] tmp;
+
+ public static void main(String[] args) throws Exception {
+ Recording recording = new Recording();
+ recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
+
+ recording.start();
+ System.gc();
+ for (int i = 0; i < OBJECTS_TO_ALLOCATE; ++i) {
+ tmp = new byte[OBJECT_SIZE - BYTE_ARRAY_OVERHEAD];
+ }
+ recording.stop();
+
+ int countAllTlabs = 0; // Count all matching tlab allocations.
+ int countFullTlabs = 0; // Count matching tlab allocations with full tlab size.
+ for (RecordedEvent event : Events.fromRecording(recording)) {
+ if (!EVENT_NAME.equals(event.getEventType().getName())) {
+ continue;
+ }
+ System.out.println("Event:" + event);
+
+ long allocationSize = Events.assertField(event, "allocationSize").atLeast(1L).getValue();
+ long tlabSize = Events.assertField(event, "tlabSize").atLeast(allocationSize).getValue();
+ String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();
+
+ boolean isMyEvent = Thread.currentThread().getId() == event.getThread().getJavaThreadId()
+ && className.equals(BYTE_ARRAY_CLASS_NAME)
+ && (allocationSize == OBJECT_SIZE || allocationSize == OBJECT_SIZE_ALT);
+ if (isMyEvent) {
+ countAllTlabs++;
+ if (tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE || tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE_ALT) {
+ countFullTlabs++;
+ }
+ }
+ }
+
+ int minCount = (int) floor(OBJECTS_TO_ALLOCATE * 0.80);
+ assertGreaterThanOrEqual(countAllTlabs, minCount, "Too few tlab objects allocated");
+ assertLessThanOrEqual(countAllTlabs, OBJECTS_TO_ALLOCATE, "Too many tlab objects allocated");
+
+ // For most GCs we expect the size of each tlab to be
+ // INITIAL_TLAB_SIZE + ALLOCATION_SIZE, but that is not always true for G1.
+ // G1 may use a smaller tlab size if the full tlab does not fit in the
+ // selected memory region.
+ //
+ // For example, if a G1 memory region has room for 4.7 tlabs,
+ // then the first 4 tlabs will have the expected size,
+ // but the fifth tlab would only have a size of 0.7*expected.
+ //
+ // It is only the last tlab in each region that has a smaller size.
+ // This means that at least 50% of the allocated tlabs should
+ // have the expected size (1 full tlab, and 1 fractional tlab).
+ assertGreaterThanOrEqual(2*countFullTlabs, countAllTlabs, "Too many fractional tlabs.");
+ }
+
+}