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annotate src/share/vm/services/memPtr.cpp @ 6882:716c64bda5ba

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7199092: NMT: NMT needs to deal overlapped virtual memory ranges Summary: Enhanced virtual memory tracking to track committed regions as well as reserved regions, so NMT now can generate virtual memory map. Reviewed-by: acorn, coleenp
author zgu
date Fri, 19 Oct 2012 21:40:07 -0400
parents 33143ee07800
children 4102b59539ce
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1 /*
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2 * Copyright (c) 2012, 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 #include "precompiled.hpp"
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26 #include "services/memPtr.hpp"
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27 #include "services/memTracker.hpp"
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28
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29 volatile jint SequenceGenerator::_seq_number = 1;
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30 NOT_PRODUCT(jint SequenceGenerator::_max_seq_number = 1;)
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31 DEBUG_ONLY(volatile unsigned long SequenceGenerator::_generation = 0;)
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32
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33 jint SequenceGenerator::next() {
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34 jint seq = Atomic::add(1, &_seq_number);
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35 if (seq < 0) {
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36 MemTracker::shutdown(MemTracker::NMT_sequence_overflow);
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37 }
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38 assert(seq > 0, "counter overflow");
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39 NOT_PRODUCT(_max_seq_number = (seq > _max_seq_number) ? seq : _max_seq_number;)
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40 return seq;
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41 }
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42