1 /* 2 * Copyright (c) 2018, 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 TestConcurrentSystemGC 26 * @bug 8195158 27 * @summary Test that a System.gc() with -XX:+ExplicitGCInvokesConcurrent 28 * is *not* upgraded to STW full GC 29 * @key gc 30 * @requires vm.gc.G1 31 * @library /test/lib 32 * @modules java.base/jdk.internal.misc 33 * java.management 34 * @run main/othervm -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -Xmx8m -Xms8m -XX:G1HeapRegionSize=1m TestConcurrentSystemGC 35 */ 36 37 import java.util.ArrayList; 38 import java.util.List; 39 40 public class TestConcurrentSystemGC { 41 public static List<char[]> memory; 42 public static void main(String[] args) throws Exception { 43 memory = new ArrayList<>(); 44 try { 45 while (true) { 46 memory.add(new char[1024 * 128]); 47 System.gc(); // should not trigger any assertions 48 } 49 } catch (OutOfMemoryError e) { 50 memory = null; 51 System.gc(); 52 } 53 } 54 }