1 /*
2 * Copyright (c) 2013, 2026, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package jdk.jfr.event.allocation;
25
26 import static java.lang.Math.floor;
27
28 import jdk.jfr.Recording;
29 import jdk.jfr.consumer.RecordedEvent;
30 import jdk.test.lib.jfr.EventNames;
31 import jdk.test.lib.jfr.Events;
32 import jdk.test.lib.Asserts;
33 import jdk.test.lib.Platform;
34 import jdk.test.whitebox.WhiteBox;
35
36 /**
37 * @test
38 * @summary Test that when an object is allocated outside a TLAB an event will be triggered.
39 * @requires vm.flagless
40 * @requires vm.hasJFR
41 * @library /test/lib
42 * @build jdk.test.whitebox.WhiteBox
43 *
44 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
45 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
46 * -XX:+UseTLAB -XX:TLABSize=90k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=256
47 * jdk.jfr.event.allocation.TestObjectAllocationOutsideTLABEvent
48 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
49 * -XX:+UseTLAB -XX:TLABSize=90k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=256
50 * -Xint
51 * jdk.jfr.event.allocation.TestObjectAllocationOutsideTLABEvent
52 */
53
54 /**
55 * Test that an event is triggered when an object is allocated outside a
56 * Thread Local Allocation Buffer (TLAB). The test is done for default interpreted mode (-Xint).
57 *
58 * To force objects to be allocated outside TLAB:
59 * the initial size of TLAB is set to 90k (-XX:TLABSize=90k);
60 * the size of allocated objects is set to 128k;
61 * max TLAB waste at refill is set to 256 (-XX:TLABRefillWasteFraction=256),
62 * to prevent a new TLAB creation.
63 */
64 public class TestObjectAllocationOutsideTLABEvent {
65 private static final String EVENT_NAME = EventNames.ObjectAllocationOutsideTLAB;
66
67 // 64-bit COH: MW8 + L4 + End Alignment = 16
68 // 64-bit -COH: MW8 + K4 + L4 = 16
69 // 32-bit : MW4 + K4 + L4 + End Alignment = 16
70 private static final Boolean COMPACT_HEADERS = WhiteBox.getWhiteBox().getBooleanVMFlag("UseCompactObjectHeaders");
71
72 private static final int BYTE_ARRAY_OVERHEAD = COMPACT_HEADERS ? 12 : 16;
73 private static final int OBJECT_SIZE = 128 * 1024;
74
75 private static final int OBJECTS_TO_ALLOCATE = 100;
76 private static final String BYTE_ARRAY_CLASS_NAME = new byte[0].getClass().getName();
77 private static int eventCount;
78
79 // Make sure allocation isn't dead code eliminated.
80 public static byte[] tmp;
81
82 public static void main(String[] args) throws Exception {
83 Recording recording = new Recording();
84 recording.enable(EVENT_NAME);
85 recording.start();
86 allocate();
87 recording.stop();
88 verifyRecording(recording);
89 int minCount = (int) floor(OBJECTS_TO_ALLOCATE * 0.80);
90 Asserts.assertGreaterThanOrEqual(eventCount, minCount, "Too few objects allocated");
91 Asserts.assertLessThanOrEqual(eventCount, OBJECTS_TO_ALLOCATE, "Too many objects allocated");
92 }
93
94 private static void allocate() {
95 for (int i = 0; i < OBJECTS_TO_ALLOCATE; ++i) {
96 tmp = new byte[OBJECT_SIZE - BYTE_ARRAY_OVERHEAD];
97 }
98 }
99
100 private static void verifyRecording(Recording recording) throws Exception {
101 for (RecordedEvent event : Events.fromRecording(recording)) {
102 verify(event);
103 }
104 }
105
106 private static void verify(RecordedEvent event) {
107 if (Thread.currentThread().getId() != event.getThread().getJavaThreadId()) {
108 return;
109 }
110 long allocationSize = Events.assertField(event, "allocationSize").atLeast(1L).getValue();
111 String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();
112 if (className.equals(BYTE_ARRAY_CLASS_NAME) && (allocationSize == OBJECT_SIZE)) {
113 ++eventCount;
114 }
115 }
116 }