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1 /* |
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2 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @key gc |
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27 * @bug 8049831 |
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28 * @library /test/lib |
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29 * @modules java.base/jdk.internal.misc |
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30 * java.management |
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31 * @build sun.hotspot.WhiteBox |
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32 * @run main ClassFileInstaller sun.hotspot.WhiteBox |
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33 * sun.hotspot.WhiteBox$WhiteBoxPermission |
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34 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestCapacityUntilGCWrapAround |
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35 */ |
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36 |
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37 import sun.hotspot.WhiteBox; |
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38 |
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39 import jdk.test.lib.Asserts; |
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40 import jdk.test.lib.Platform; |
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41 |
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42 public class TestCapacityUntilGCWrapAround { |
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43 private static long MB = 1024 * 1024; |
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44 private static long GB = 1024 * MB; |
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45 private static long MAX_UINT = 4 * GB - 1; // On 32-bit platforms |
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46 |
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47 public static void main(String[] args) { |
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48 if (Platform.is32bit()) { |
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49 WhiteBox wb = WhiteBox.getWhiteBox(); |
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50 |
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51 long before = wb.metaspaceCapacityUntilGC(); |
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52 // Now force possible overflow of capacity_until_GC. |
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53 long after = wb.incMetaspaceCapacityUntilGC(MAX_UINT); |
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54 |
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55 Asserts.assertGTE(after, before, |
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56 "Increasing with MAX_UINT should not cause wrap around: " + after + " < " + before); |
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57 Asserts.assertLTE(after, MAX_UINT, |
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58 "Increasing with MAX_UINT should not cause value larger than MAX_UINT:" + after); |
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59 } |
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60 } |
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61 } |