102 lines
4.2 KiB
Java
102 lines
4.2 KiB
Java
/*
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* Copyright (c) 2020, 2022, 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.
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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 gc.testlibrary.g1;
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import static java.util.stream.IntStream.range;
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import static jdk.test.lib.Asserts.assertTrue;
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import static jdk.test.whitebox.WhiteBox.getWhiteBox;
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import java.util.ArrayList;
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import java.util.List;
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import gc.testlibrary.Helpers;
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import jdk.test.lib.Asserts;
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/**
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* Utility class to reliably provoke a mixed GC. The class allocates several arrays and
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* promotes them to the old generation. All GCs are triggered by Whitebox to ensure that they occur.
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* Must use G1.
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*/
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public class MixedGCProvoker {
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/**
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* Allocate a few objects that are supposed to end up in the old generation as they are held live by the
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* given array. Caller must make sure by running this test with e.g. -XX:+AlwaysTenure that the objects
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* to actually be tenured.
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* Mixes live and dead objects, allocating about two regions worth of objects.
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* @param liveOldObjects Array receiving the live objects after this method.
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* @param g1HeapRegionSize Size of a G1 heap region.
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* @param arraySize Size of the byte arrays to use.
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*/
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public static void allocateOldObjects(
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List<byte[]> liveOldObjects,
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int g1HeapRegionSize,
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int arraySize) {
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var toUnreachable = new ArrayList<byte[]>();
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// Allocates buffer and promotes it to the old gen. Mix live and dead old objects.
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// allocate about two regions of old memory. At least one full old region will guarantee
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// mixed collection in the future
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range(0, g1HeapRegionSize/arraySize).forEach(n -> {
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liveOldObjects.add(new byte[arraySize]);
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toUnreachable.add(new byte[arraySize]);
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});
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// Do one young collection, AlwaysTenure will force promotion.
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getWhiteBox().youngGC();
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// Check it is promoted & keep alive
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Asserts.assertTrue(getWhiteBox().isObjectInOldGen(liveOldObjects), "List of the objects is suppose to be in OldGen");
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Asserts.assertTrue(getWhiteBox().isObjectInOldGen(toUnreachable), "List of the objects is suppose to be in OldGen");
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}
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/**
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* Provoke at least one mixed gc by performing a concurrent collection
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* and triggering two GCs.
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* @param liveOldObjects The objects supposed to survive this marking cycle.
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*/
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public static void provokeMixedGC(List<byte[]> liveOldObjects) {
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getWhiteBox().g1RunConcurrentGC();
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getWhiteBox().youngGC(); // the "Prepare Mixed" gc
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getWhiteBox().youngGC(); // the "Mixed" gc
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// check that liveOldObjects still alive
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assertTrue(getWhiteBox().isObjectInOldGen(liveOldObjects), "List of the objects is suppose to be in OldGen");
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}
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/**
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* Provoke a mixed GC on a G1 heap with the given heap region size.
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* @param g1HeapRegionSize The size of your regions in bytes
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*/
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public static void allocateAndProvokeMixedGC(int g1HeapRegionSize) {
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final var arraySize = 20_000;
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var liveOldObjects = new ArrayList<byte[]>();
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getWhiteBox().fullGC(); // Make sure the heap is in a known state.
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allocateOldObjects(liveOldObjects, g1HeapRegionSize, arraySize);
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provokeMixedGC(liveOldObjects);
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}
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}
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