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annotate src/share/vm/memory/metaspaceCounters.hpp @ 12301:2c022e432e10

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8024974: Incorrect use of GC_locker::is_active() Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint. Reviewed-by: brutisso, dcubed Contributed-by: per.liden@oracle.com
author stefank
date Fri, 20 Sep 2013 10:53:28 +0200
parents 73d0d0218068
children de6a9e811145
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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 #ifndef SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
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26 #define SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
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27
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28 #include "memory/allocation.hpp"
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29
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30 class MetaspacePerfCounters;
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31
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32 class MetaspaceCounters: public AllStatic {
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33 static MetaspacePerfCounters* _perf_counters;
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34 static size_t used();
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35 static size_t capacity();
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36 static size_t max_capacity();
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37
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38 public:
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39 static void initialize_performance_counters();
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40 static void update_performance_counters();
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41 };
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42
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43 class CompressedClassSpaceCounters: public AllStatic {
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44 static MetaspacePerfCounters* _perf_counters;
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45 static size_t used();
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46 static size_t capacity();
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47 static size_t max_capacity();
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48
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49 public:
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50 static void initialize_performance_counters();
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51 static void update_performance_counters();
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52 };
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53
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54 #endif // SHARE_VM_MEMORY_METASPACECOUNTERS_HPP