116 lines
3.8 KiB
Java
116 lines
3.8 KiB
Java
/*
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* Copyright (c) 2014, 2023, 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.g1;
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/*
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* @test TestEagerReclaimHumongousRegionsWithRefs
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* @bug 8048179
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* @summary Test to make sure that eager reclaim of humongous objects that have previously
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* been referenced by other old gen regions work. We simply try to fill
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* up the heap with humongous objects and create a remembered set entry from an object by
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* referencing that we know is in the old gen. After changing this reference, the object
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* should still be eagerly reclaimable to avoid Full GC.
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* @requires vm.gc.G1
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver gc.g1.TestEagerReclaimHumongousRegionsWithRefs
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*/
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import java.util.regex.Pattern;
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import java.util.regex.Matcher;
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import java.util.LinkedList;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import static jdk.test.lib.Asserts.*;
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class RefHolder {
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Object ref;
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}
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class TestEagerReclaimHumongousRegionsWithRefsReclaimRegionFast {
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public static final int M = 1024*1024;
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public static LinkedList<Object> garbageList = new LinkedList<Object>();
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public static void genGarbage() {
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for (int i = 0; i < 32*1024; i++) {
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garbageList.add(new int[100]);
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}
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garbageList.clear();
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}
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// A large object referenced by a static.
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static int[] filler = new int[10 * M];
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// Old gen object referencing the large object, generating remembered
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// set entries.
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static RefHolder fromOld = new RefHolder();
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public static void main(String[] args) {
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int[] large = new int[M];
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Object ref_from_stack = large;
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for (int i = 0; i < 100; i++) {
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// A large object that will be reclaimed eagerly.
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large = new int[6*M];
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fromOld.ref = large;
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genGarbage();
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}
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// Keep the reference to the first object alive.
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System.out.println(ref_from_stack);
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}
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}
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public class TestEagerReclaimHumongousRegionsWithRefs {
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public static void main(String[] args) throws Exception {
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(
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"-XX:+UseG1GC",
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"-Xms128M",
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"-Xmx128M",
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"-Xmn16M",
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"-Xlog:gc",
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TestEagerReclaimHumongousRegionsWithRefsReclaimRegionFast.class.getName());
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Pattern p = Pattern.compile("Full GC");
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int found = 0;
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Matcher m = p.matcher(output.getStdout());
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while (m.find()) {
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found++;
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}
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System.out.println("Issued " + found + " Full GCs");
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assertLessThan(found, 10, "Found that " + found + " Full GCs were issued. This is larger than the bound. Eager reclaim of objects once referenced from old gen seems to not work at all");
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output.shouldHaveExitValue(0);
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}
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}
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