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annotate test/runtime/NMT/ReleaseCommittedMemory.java @ 12986:1b422ef5288a

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8025728: Missing volatile specifier for field G1AllocRegion::_alloc_region Summary: The field G1AllocRegion::_alloc_region needs to be declared volatile as it is used with that intention. Otherwise the compiler may generate the code that reloads the value which might have changed in the meantime, leading to spurious crashes. Reviewed-by: iveresov, simonis, tschatzl Contributed-by: Axel Siebenborn <axel.siebenborn@sap.com>
author tschatzl
date Wed, 23 Oct 2013 10:23:06 +0200
parents c18152e0554e
children ac12996df59b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2013, 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 * @bug 8013120
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27 * @summary Release committed memory and make sure NMT handles it correctly
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28 * @key nmt regression
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29 * @library /testlibrary /testlibrary/whitebox
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30 * @build ReleaseCommittedMemory
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31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail ReleaseCommittedMemory
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33 */
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34
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35 import sun.hotspot.WhiteBox;
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37 public class ReleaseCommittedMemory {
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39 public static void main(String args[]) throws Exception {
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40 WhiteBox wb = WhiteBox.getWhiteBox();
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41 long reserveSize = 256 * 1024;
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42 long addr;
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44 addr = wb.NMTReserveMemory(reserveSize);
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45 wb.NMTCommitMemory(addr, 128*1024);
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46 wb.NMTReleaseMemory(addr, reserveSize);
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47 wb.NMTWaitForDataMerge();
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48 }
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49 }
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