1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test TestPLABOutput 26 * @bug 8140585 27 * @summary Check that G1 does not report empty PLAB statistics in the first evacuation. 28 * @requires vm.gc.G1 29 * @key gc 30 * @modules java.base/jdk.internal.misc 31 * @library /test/lib 32 * @build sun.hotspot.WhiteBox 33 * @run main ClassFileInstaller sun.hotspot.WhiteBox 34 * @run driver TestPLABOutput 35 */ 36 37 import sun.hotspot.WhiteBox; 38 39 import java.util.regex.Matcher; 40 import java.util.regex.Pattern; 41 42 import jdk.test.lib.Platform; 43 import jdk.test.lib.process.OutputAnalyzer; 44 import jdk.test.lib.process.ProcessTools; 45 46 import static jdk.test.lib.Asserts.*; 47 48 public class TestPLABOutput { 49 50 public static void runTest() throws Exception { 51 final String[] arguments = { 52 "-Xbootclasspath/a:.", 53 "-XX:+UnlockExperimentalVMOptions", 54 "-XX:+UnlockDiagnosticVMOptions", 55 "-XX:+WhiteBoxAPI", 56 "-XX:+UseG1GC", 57 "-Xmx10M", 58 "-Xlog:gc+plab=debug", 59 GCTest.class.getName() 60 }; 61 62 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments); 63 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 64 65 output.shouldHaveExitValue(0); 66 67 System.out.println(output.getStdout()); 68 69 String pattern = ".*GC\\(0\\) .*allocated: (\\d+).*"; 70 Pattern r = Pattern.compile(pattern); 71 Matcher m = r.matcher(output.getStdout()); 72 73 if (!m.find()) { 74 throw new RuntimeException("Could not find any PLAB statistics output"); 75 } 76 int allocated = Integer.parseInt(m.group(1)); 77 assertGT(allocated, 0, "Did not allocate any memory during test"); 78 } 79 80 public static void main(String[] args) throws Exception { 81 runTest(); 82 } 83 84 static class GCTest { 85 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 86 87 public static Object holder; 88 89 public static void main(String [] args) { 90 holder = new byte[100]; 91 WB.youngGC(); 92 System.out.println(holder); 93 } 94 } 95 } 96