| /* |
| * Copyright (c) 2017, 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 TestEagerReclaimHumongousRegionsLog |
| * @summary Check that G1 reports humongous eager reclaim statistics correctly. |
| * @requires vm.gc.G1 |
| * @key gc |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @build sun.hotspot.WhiteBox |
| * @run driver ClassFileInstaller sun.hotspot.WhiteBox |
| * @run driver TestEagerReclaimHumongousRegionsLog |
| */ |
| |
| import sun.hotspot.WhiteBox; |
| |
| import java.util.Arrays; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import jdk.test.lib.Asserts; |
| |
| import jdk.test.lib.Platform; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| |
| public class TestEagerReclaimHumongousRegionsLog { |
| |
| private static final String LogSeparator = ": "; |
| |
| public static void runTest() throws Exception { |
| final String[] arguments = { |
| "-Xbootclasspath/a:.", |
| "-XX:+UnlockExperimentalVMOptions", |
| "-XX:+UnlockDiagnosticVMOptions", |
| "-XX:+WhiteBoxAPI", |
| "-XX:+UseG1GC", |
| "-XX:G1HeapRegionSize=1M", |
| "-Xms128M", |
| "-Xmx128M", |
| "-Xlog:gc+phases=trace,gc+heap=info", |
| GCTest.class.getName() |
| }; |
| |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments); |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| |
| output.shouldHaveExitValue(0); |
| |
| System.out.println(output.getStdout()); |
| |
| // This gives an array of lines containing eager reclaim of humongous regions |
| // log messages contents after the ":" in the following order for every GC: |
| // Humongous Register: a.ams |
| // Humongous Total: b |
| // Humongous Candidate: c |
| // Humongous Reclaim: d.dms |
| // Humongous Reclaimed: e |
| // Humongous Regions: f->g |
| |
| String[] lines = Arrays.stream(output.getStdout().split("\\R")) |
| .filter(s -> s.contains("Humongous")).map(s -> s.substring(s.indexOf(LogSeparator) + LogSeparator.length())) |
| .toArray(String[]::new); |
| |
| Asserts.assertTrue(lines.length % 6 == 0, "There seems to be an unexpected amount of log messages (total: " + lines.length + ") per GC"); |
| |
| for (int i = 0; i < lines.length; i += 6) { |
| int total = Integer.parseInt(lines[i + 1]); |
| int candidate = Integer.parseInt(lines[i + 2]); |
| int reclaimed = Integer.parseInt(lines[i + 4]); |
| |
| int before = Integer.parseInt(lines[i + 5].substring(0, 1)); |
| int after = Integer.parseInt(lines[i + 5].substring(3, 4)); |
| System.out.println("total " + total + " candidate " + candidate + " reclaimed " + reclaimed + " before " + before + " after " + after); |
| |
| Asserts.assertEQ(total, candidate, "Not all humonguous objects are candidates"); |
| Asserts.assertLTE(reclaimed, candidate, "The number of reclaimed objects must be less or equal than the number of candidates"); |
| |
| if (reclaimed > 0) { |
| Asserts.assertLT(after, before, "Number of regions after must be smaller than before."); |
| Asserts.assertEQ(reclaimed, candidate, "Must have reclaimed all candidates."); |
| Asserts.assertGT((before - after), reclaimed, "Number of regions reclaimed (" + (before - after) + |
| ") must be larger than number of objects reclaimed (" + reclaimed + ")"); |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| runTest(); |
| } |
| |
| static class GCTest { |
| private static final WhiteBox WB = WhiteBox.getWhiteBox(); |
| |
| public static Object holder; |
| |
| public static void main(String [] args) { |
| // Create a humongous objects spanning multiple regions so that the difference |
| // between number of humongous objects reclaimed and number of regions reclaimed |
| // is apparent. |
| holder = new byte[4 * 1024 * 1024]; |
| WB.youngGC(); |
| System.out.println(holder); |
| holder = null; |
| WB.youngGC(); |
| } |
| } |
| } |
| |