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/*
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* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.event.compiler;
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import static java.lang.Math.floor;
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import static jdk.test.lib.Asserts.assertGreaterThanOrEqual;
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import static jdk.test.lib.Asserts.assertLessThanOrEqual;
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import java.time.Duration;
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import jdk.jfr.Recording;
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import jdk.jfr.consumer.RecordedEvent;
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import jdk.test.lib.jfr.EventNames;
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import jdk.test.lib.jfr.Events;
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51214
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/**
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50113
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* @test
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* @summary Test that event is triggered when an object is allocated in a new TLAB.
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* @key jfr
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51214
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* @requires vm.hasJFR
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50113
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* @library /test/lib
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* @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 jdk.jfr.event.compiler.TestAllocInNewTLAB
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* @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -XX:-FastTLABRefill jdk.jfr.event.compiler.TestAllocInNewTLAB
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* @run main/othervm -XX:+UseTLAB -XX:TLABSize=100k -XX:-ResizeTLAB -XX:TLABRefillWasteFraction=1 -Xint jdk.jfr.event.compiler.TestAllocInNewTLAB
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*/
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/**
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* Test that when an object is allocated in a new Thread Local Allocation Buffer (TLAB)
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* an event will be triggered. The test is done for C1-compiler,
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* C2-compiler (-XX:-FastTLABRefill) and interpreted mode (-Xint).
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*
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* To force objects to be allocated in a new TLAB:
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* the size of TLAB is set to 100k (-XX:TLABSize=100k);
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* the size of allocated objects is set to 100k minus 16 bytes overhead;
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* max TLAB waste at refill is set to minimum (-XX:TLABRefillWasteFraction=1),
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* to provoke a new TLAB creation.
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*/
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public class TestAllocInNewTLAB {
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private final static String EVENT_NAME = EventNames.ObjectAllocationInNewTLAB;
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private static final int BYTE_ARRAY_OVERHEAD = 16; // Extra bytes used by a byte array.
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private static final int OBJECT_SIZE = 100 * 1024;
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private static final int OBJECT_SIZE_ALT = OBJECT_SIZE + 8; // Object size in case of disabled CompressedOops
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private static final int OBJECTS_TO_ALLOCATE = 100;
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private static final String BYTE_ARRAY_CLASS_NAME = new byte[0].getClass().getName();
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private static final int INITIAL_TLAB_SIZE = 100 * 1024;
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// make sure allocation isn't dead code eliminated
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public static byte[] tmp;
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public static void main(String[] args) throws Exception {
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Recording recording = new Recording();
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recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
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recording.start();
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System.gc();
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for (int i = 0; i < OBJECTS_TO_ALLOCATE; ++i) {
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tmp = new byte[OBJECT_SIZE - BYTE_ARRAY_OVERHEAD];
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}
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recording.stop();
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int countAllTlabs = 0; // Count all matching tlab allocations.
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int countFullTlabs = 0; // Count matching tlab allocations with full tlab size.
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for (RecordedEvent event : Events.fromRecording(recording)) {
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if (!EVENT_NAME.equals(event.getEventType().getName())) {
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continue;
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}
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System.out.println("Event:" + event);
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long allocationSize = Events.assertField(event, "allocationSize").atLeast(1L).getValue();
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long tlabSize = Events.assertField(event, "tlabSize").atLeast(allocationSize).getValue();
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String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();
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boolean isMyEvent = Thread.currentThread().getId() == event.getThread().getJavaThreadId()
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&& className.equals(BYTE_ARRAY_CLASS_NAME)
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&& (allocationSize == OBJECT_SIZE || allocationSize == OBJECT_SIZE_ALT);
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if (isMyEvent) {
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countAllTlabs++;
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if (tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE || tlabSize == INITIAL_TLAB_SIZE + OBJECT_SIZE_ALT) {
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countFullTlabs++;
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}
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}
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}
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int minCount = (int) floor(OBJECTS_TO_ALLOCATE * 0.80);
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assertGreaterThanOrEqual(countAllTlabs, minCount, "Too few tlab objects allocated");
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assertLessThanOrEqual(countAllTlabs, OBJECTS_TO_ALLOCATE, "Too many tlab objects allocated");
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// For most GCs we expect the size of each tlab to be
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// INITIAL_TLAB_SIZE + ALLOCATION_SIZE, but that is not always true for G1.
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// G1 may use a smaller tlab size if the full tlab does not fit in the
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// selected memory region.
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//
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// For example, if a G1 memory region has room for 4.7 tlabs,
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// then the first 4 tlabs will have the expected size,
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// but the fifth tlab would only have a size of 0.7*expected.
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//
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// It is only the last tlab in each region that has a smaller size.
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// This means that at least 50% of the allocated tlabs should
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// have the expected size (1 full tlab, and 1 fractional tlab).
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assertGreaterThanOrEqual(2*countFullTlabs, countAllTlabs, "Too many fractional tlabs.");
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}
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}
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