130 lines
5.4 KiB
Java
130 lines
5.4 KiB
Java
/*
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* Copyright (c) 2017, 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 TestEagerReclaimHumongousRegionsLog
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* @summary Check that G1 reports humongous eager reclaim statistics correctly.
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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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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run driver gc.g1.TestEagerReclaimHumongousRegionsLog
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*/
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import jdk.test.whitebox.WhiteBox;
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import java.util.Arrays;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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public class TestEagerReclaimHumongousRegionsLog {
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private static final String LogSeparator = ": ";
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static final String SumSeparator = "Sum: ";
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private static String getSumValue(String s) {
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return s.substring(s.indexOf(SumSeparator) + SumSeparator.length(), s.indexOf(", Workers"));
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}
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public static void runTest() throws Exception {
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(
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"-Xbootclasspath/a:.",
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"-XX:+UnlockExperimentalVMOptions",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"-XX:+UseG1GC",
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"-XX:G1HeapRegionSize=1M",
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"-Xms128M",
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"-Xmx128M",
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"-Xlog:gc+phases=trace,gc+heap=info",
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GCTest.class.getName());
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output.shouldHaveExitValue(0);
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System.out.println(output.getStdout());
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// This gives an array of lines containing eager reclaim of humongous regions
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// log messages contents after the ":" in the following order for every GC:
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// Region Register: a.ams
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// Eagerly Reclaim Humonguous Objects b.cms
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// Humongous Total: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: c, Workers: 1
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// Humongous Candidate: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: d, Workers: 1
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// Humongous Reclaimed: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: e, Workers: 1
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// Humongous Regions: f->g
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String[] lines = Arrays.stream(output.getStdout().split("\\R"))
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.filter(s -> (s.contains("Humongous") || s.contains("Region Register"))).map(s -> s.substring(s.indexOf(LogSeparator) + LogSeparator.length()))
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.toArray(String[]::new);
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Asserts.assertTrue(lines.length % 6 == 0, "There seems to be an unexpected amount of log messages (total: " + lines.length + ") per GC");
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for (int i = 0; i < lines.length; i += 6) {
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int total = Integer.parseInt(getSumValue(lines[i + 2]));
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int candidate = Integer.parseInt(getSumValue(lines[i + 3]));
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int reclaimed = Integer.parseInt(getSumValue(lines[i + 4]));
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int before = Integer.parseInt(lines[i + 5].substring(0, 1));
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int after = Integer.parseInt(lines[i + 5].substring(3, 4));
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System.out.println("total " + total + " candidate " + candidate + " reclaimed " + reclaimed + " before " + before + " after " + after);
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Asserts.assertEQ(total, candidate, "Not all humonguous objects are candidates");
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Asserts.assertLTE(reclaimed, candidate, "The number of reclaimed objects must be less or equal than the number of candidates");
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if (reclaimed > 0) {
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Asserts.assertLT(after, before, "Number of regions after must be smaller than before.");
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Asserts.assertEQ(reclaimed, candidate, "Must have reclaimed all candidates.");
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Asserts.assertGT((before - after), reclaimed, "Number of regions reclaimed (" + (before - after) +
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") must be larger than number of objects reclaimed (" + reclaimed + ")");
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}
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}
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}
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public static void main(String[] args) throws Exception {
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runTest();
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}
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static class GCTest {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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public static Object holder;
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public static void main(String [] args) {
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// Create a humongous objects spanning multiple regions so that the difference
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// between number of humongous objects reclaimed and number of regions reclaimed
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// is apparent.
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holder = new byte[4 * 1024 * 1024];
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WB.youngGC();
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System.out.println(holder);
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holder = null;
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WB.youngGC();
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}
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}
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}
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