| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test TestG1TraceEagerReclaimHumongousObjects |
| * @bug 8058801 8048179 |
| * @summary Ensure that the output for a G1TraceEagerReclaimHumongousObjects |
| * includes the expected necessary messages. |
| * @key gc |
| * @requires vm.gc.G1 |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| */ |
| |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| import java.util.LinkedList; |
| |
| public class TestG1TraceEagerReclaimHumongousObjects { |
| public static void main(String[] args) throws Exception { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", |
| "-Xms128M", |
| "-Xmx128M", |
| "-Xmn16M", |
| "-XX:G1HeapRegionSize=1M", |
| "-Xlog:gc+phases=trace,gc+humongous=trace", |
| "-XX:+UnlockExperimentalVMOptions", |
| GCWithHumongousObjectTest.class.getName()); |
| |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| |
| // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed. |
| output.shouldContain("Humongous Reclaim"); |
| output.shouldContain("Humongous Total"); |
| output.shouldContain("Humongous Candidate"); |
| output.shouldContain("Humongous Reclaimed"); |
| |
| // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects, |
| // these logs should be displayed. |
| output.shouldContain("Live humongous"); |
| output.shouldContain("Dead humongous region"); |
| output.shouldHaveExitValue(0); |
| } |
| |
| static class GCWithHumongousObjectTest { |
| |
| public static final int M = 1024*1024; |
| public static LinkedList<Object> garbageList = new LinkedList<Object>(); |
| // A large object referenced by a static. |
| static int[] filler = new int[10 * M]; |
| |
| public static void genGarbage() { |
| for (int i = 0; i < 32*1024; i++) { |
| garbageList.add(new int[100]); |
| } |
| garbageList.clear(); |
| } |
| |
| public static void main(String[] args) { |
| |
| int[] large = new int[M]; |
| Object ref = large; |
| |
| System.out.println("Creating garbage"); |
| for (int i = 0; i < 100; i++) { |
| // A large object that will be reclaimed eagerly. |
| large = new int[6*M]; |
| genGarbage(); |
| // Make sure that the compiler cannot completely remove |
| // the allocation of the large object until here. |
| System.out.println(large); |
| } |
| |
| // Keep the reference to the first object alive. |
| System.out.println(ref); |
| System.out.println("Done"); |
| } |
| } |
| } |