1 /*
   2  * Copyright (c) 2013, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.event.compiler;
  27 
  28 import static java.lang.Math.floor;
  29 import static jdk.testlibrary.Asserts.assertGreaterThanOrEqual;
  30 import static jdk.testlibrary.Asserts.assertLessThanOrEqual;
  31 
  32 import java.time.Duration;
  33 
  34 import jdk.jfr.Recording;
  35 import jdk.jfr.consumer.RecordedEvent;
  36 import jdk.testlibrary.jfr.EventNames;
  37 import jdk.testlibrary.jfr.Events;
  38 
  39 /*
  40  * @test
  41  * @summary Test that when an object is allocated outside a TLAB an event will be triggered.
  42  * @key jfr
  43  * @library /lib/testlibrary
  44  * @run main/othervm -XX:+UseTLAB -XX:-FastTLABRefill -XX:TLABSize=90k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=256 jdk.jfr.event.compiler.TestAllocOutsideTLAB
  45  * @run main/othervm -XX:+UseTLAB -XX:-FastTLABRefill -XX:TLABSize=90k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=256 jdk.jfr.event.compiler.TestAllocOutsideTLAB
  46  * @run main/othervm -XX:+UseTLAB -XX:-FastTLABRefill -XX:TLABSize=90k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=256 -Xint jdk.jfr.event.compiler.TestAllocOutsideTLAB
  47  */
  48 
  49 /**
  50  * Test that an event is triggered when an object is allocated outside a
  51  * Thread Local Allocation Buffer (TLAB). The test is done for C1-compiler,
  52  * C2-compiler (-XX:-FastTLABRefill) and interpreted mode (-Xint).
  53  *
  54  * To force objects to be allocated outside TLAB:
  55  *      the size of TLAB is set to 90k (-XX:TLABSize=90k);
  56  *      the size of allocated objects is set to 100k.
  57  *      max TLAB waste at refill is set to 256 (-XX:TLABRefillWasteFraction=256),
  58  *          to prevent a new TLAB creation.
  59 */
  60 public class TestAllocOutsideTLAB {
  61     private static final String EVENT_NAME = EventNames.ObjectAllocationOutsideTLAB;
  62 
  63     private static final int BYTE_ARRAY_OVERHEAD = 16; // Extra bytes used by a byte array
  64     private static final int OBJECT_SIZE = 100 * 1024;
  65     private static final int OBJECT_SIZE_ALT = OBJECT_SIZE + 8; // Object size in case of disabled CompressedOops
  66     private static final int OBJECTS_TO_ALLOCATE = 100;
  67     private static final String BYTE_ARRAY_CLASS_NAME = new byte[0].getClass().getName();
  68 
  69     public static byte[] tmp; // Used to prevent optimizer from removing code.
  70 
  71     public static void main(String[] args) throws Exception {
  72         Recording recording = new Recording();
  73         recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
  74         recording.start();
  75         for (int i = 0; i < OBJECTS_TO_ALLOCATE; ++i) {
  76             tmp = new byte[OBJECT_SIZE - BYTE_ARRAY_OVERHEAD];
  77         }
  78         recording.stop();
  79 
  80         int countEvents = 0;
  81         for (RecordedEvent event : Events.fromRecording(recording)) {
  82             if (!EVENT_NAME.equals(event.getEventType().getName())) {
  83                 continue;
  84             }
  85             System.out.println("Event:" + event);
  86 
  87             long allocationSize = Events.assertField(event, "allocationSize").atLeast(1L).getValue();
  88             String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();
  89 
  90             boolean isMyEvent = Thread.currentThread().getId() == event.getThread().getJavaThreadId()
  91                 && className.equals(BYTE_ARRAY_CLASS_NAME)
  92                  && (allocationSize == OBJECT_SIZE || allocationSize == OBJECT_SIZE_ALT);
  93             if (isMyEvent) {
  94                 ++countEvents;
  95             }
  96         }
  97 
  98         int minCount = (int) floor(OBJECTS_TO_ALLOCATE * 0.80);
  99         assertGreaterThanOrEqual(countEvents, minCount, "Too few tlab objects allocated");
 100         assertLessThanOrEqual(countEvents, OBJECTS_TO_ALLOCATE, "Too many tlab objects allocated");
 101     }
 102 
 103 }