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1 /* |
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2 * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package jdk.jfr.event.compiler; |
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27 |
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28 import static java.lang.Math.floor; |
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29 import static jdk.test.lib.Asserts.assertGreaterThanOrEqual; |
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30 import static jdk.test.lib.Asserts.assertLessThanOrEqual; |
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31 |
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32 import java.time.Duration; |
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33 |
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34 import jdk.jfr.Recording; |
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35 import jdk.jfr.consumer.RecordedEvent; |
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36 import jdk.test.lib.jfr.EventNames; |
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37 import jdk.test.lib.jfr.Events; |
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38 |
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39 /* |
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40 * @test |
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41 * @summary Test that event is triggered when an object is allocated in a new TLAB. |
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42 * @key jfr |
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43 * @library /test/lib |
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44 * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 jdk.jfr.event.compiler.TestAllocInNewTLAB |
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45 * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -XX:-FastTLABRefill jdk.jfr.event.compiler.TestAllocInNewTLAB |
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46 * @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -Xint jdk.jfr.event.compiler.TestAllocInNewTLAB |
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47 */ |
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48 |
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49 /** |
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50 * Test that when an object is allocated in a new Thread Local Allocation Buffer (TLAB) |
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51 * an event will be triggered. The test is done for C1-compiler, |
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52 * C2-compiler (-XX:-FastTLABRefill) and interpreted mode (-Xint). |
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53 * |
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54 * To force objects to be allocated in a new TLAB: |
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55 * the size of TLAB is set to 100k (-XX:TLABSize=100k); |
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56 * the size of allocated objects is set to 100k minus 16 bytes overhead; |
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57 * max TLAB waste at refill is set to minimum (-XX:TLABRefillWasteFraction=1), |
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58 * to provoke a new TLAB creation. |
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59 */ |
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60 public class TestAllocInNewTLAB { |
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61 private final static String EVENT_NAME = EventNames.ObjectAllocationInNewTLAB; |
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62 |
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63 private static final int BYTE_ARRAY_OVERHEAD = 16; // Extra bytes used by a byte array. |
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64 private static final int OBJECT_SIZE = 100 * 1024; |
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65 private static final int OBJECT_SIZE_ALT = OBJECT_SIZE + 8; // Object size in case of disabled CompressedOops |
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66 private static final int OBJECTS_TO_ALLOCATE = 100; |
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67 private static final String BYTE_ARRAY_CLASS_NAME = new byte[0].getClass().getName(); |
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68 private static final int INITIAL_TLAB_SIZE = 100 * 1024; |
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69 |
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70 // make sure allocation isn't dead code eliminated |
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71 public static byte[] tmp; |
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72 |
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73 public static void main(String[] args) throws Exception { |
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74 Recording recording = new Recording(); |
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75 recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0)); |
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76 |
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77 recording.start(); |
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78 System.gc(); |
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79 for (int i = 0; i < OBJECTS_TO_ALLOCATE; ++i) { |
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80 tmp = new byte[OBJECT_SIZE - BYTE_ARRAY_OVERHEAD]; |
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81 } |
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82 recording.stop(); |
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83 |
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84 int countAllTlabs = 0; // Count all matching tlab allocations. |
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85 int countFullTlabs = 0; // Count matching tlab allocations with full tlab size. |
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86 for (RecordedEvent event : Events.fromRecording(recording)) { |
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87 if (!EVENT_NAME.equals(event.getEventType().getName())) { |
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88 continue; |
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89 } |
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90 System.out.println("Event:" + event); |
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91 |
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92 long allocationSize = Events.assertField(event, "allocationSize").atLeast(1L).getValue(); |
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93 long tlabSize = Events.assertField(event, "tlabSize").atLeast(allocationSize).getValue(); |
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94 String className = Events.assertField(event, "objectClass.name").notEmpty().getValue(); |
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95 |
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96 boolean isMyEvent = Thread.currentThread().getId() == event.getThread().getJavaThreadId() |
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97 && className.equals(BYTE_ARRAY_CLASS_NAME) |
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98 && (allocationSize == OBJECT_SIZE || allocationSize == OBJECT_SIZE_ALT); |
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99 if (isMyEvent) { |
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100 countAllTlabs++; |
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101 if (tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE || tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE_ALT) { |
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102 countFullTlabs++; |
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103 } |
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104 } |
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105 } |
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106 |
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107 int minCount = (int) floor(OBJECTS_TO_ALLOCATE * 0.80); |
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108 assertGreaterThanOrEqual(countAllTlabs, minCount, "Too few tlab objects allocated"); |
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109 assertLessThanOrEqual(countAllTlabs, OBJECTS_TO_ALLOCATE, "Too many tlab objects allocated"); |
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110 |
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111 // For most GCs we expect the size of each tlab to be |
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112 // INITIAL_TLAB_SIZE + ALLOCATION_SIZE, but that is not always true for G1. |
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113 // G1 may use a smaller tlab size if the full tlab does not fit in the |
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114 // selected memory region. |
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115 // |
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116 // For example, if a G1 memory region has room for 4.7 tlabs, |
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117 // then the first 4 tlabs will have the expected size, |
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118 // but the fifth tlab would only have a size of 0.7*expected. |
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119 // |
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120 // It is only the last tlab in each region that has a smaller size. |
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121 // This means that at least 50% of the allocated tlabs should |
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122 // have the expected size (1 full tlab, and 1 fractional tlab). |
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123 assertGreaterThanOrEqual(2*countFullTlabs, countAllTlabs, "Too many fractional tlabs."); |
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124 } |
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125 |
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126 } |