1 /* 2 * Copyright (c) 2013, 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 SystemGCOnForegroundCollector 26 * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null" 27 * @summary CMS: Call reset_after_compaction() only if a compaction has been done 28 * @bug 8013184 29 * @key gc 30 * @key regression 31 * @library /testlibrary 32 * @run main/othervm SystemGCOnForegroundCollector 33 * @author jon.masamitsu@oracle.com 34 */ 35 36 import com.oracle.java.testlibrary.*; 37 38 public class SystemGCOnForegroundCollector { 39 public static void main(String args[]) throws Exception { 40 41 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 42 "-showversion", 43 "-XX:+UseConcMarkSweepGC", 44 "-XX:MaxTenuringThreshold=1", 45 "-XX:-UseCMSCompactAtFullCollection", 46 ThreePlusMSSystemGC.class.getName() 47 ); 48 49 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 50 51 output.shouldNotContain("error"); 52 53 output.shouldHaveExitValue(0); 54 } 55 56 static class ThreePlusMSSystemGC { 57 public static void main(String [] args) { 58 // From running this test 3 System.gc() were always 59 // enough to see the failure but the cause of the failure 60 // depends on how objects are allocated in the CMS generation 61 // which is non-deterministic. Use 30 iterations for a more 62 // reliable test. 63 for (int i = 0; i < 30; i++) { 64 System.gc(); 65 } 66 } 67 } 68 }