1 /* 2 * Copyright (c) 2014, 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 26 * @key gc 27 * @bug 8049831 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @build sun.hotspot.WhiteBox 32 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 33 * sun.hotspot.WhiteBox$WhiteBoxPermission 34 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:safepoint+stats=debug:gc.log TestCapacityUntilGCWrapAround 35 */ 36 37 import sun.hotspot.WhiteBox; 38 39 import jdk.test.lib.Asserts; 40 import jdk.test.lib.Platform; 41 42 public class TestCapacityUntilGCWrapAround { 43 private static long MB = 1024 * 1024; 44 private static long GB = 1024 * MB; 45 private static long MAX_UINT = 4 * GB - 1; // On 32-bit platforms 46 47 public static void main(String[] args) { 48 if (Platform.is32bit()) { 49 WhiteBox wb = WhiteBox.getWhiteBox(); 50 51 long before = wb.metaspaceCapacityUntilGC(); 52 // Now force possible overflow of capacity_until_GC. 53 long after = wb.incMetaspaceCapacityUntilGC(MAX_UINT); 54 55 Asserts.assertGTE(after, before, 56 "Increasing with MAX_UINT should not cause wrap around: " + after + " < " + before); 57 Asserts.assertLTE(after, MAX_UINT, 58 "Increasing with MAX_UINT should not cause value larger than MAX_UINT:" + after); 59 } 60 } 61 }