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annotate src/share/vm/classfile/metadataOnStackMark.hpp @ 20619:b12a2a9b05ca

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8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse Reviewed-by: mgerdin, coleenp, bdelsart
author stefank
date Thu, 02 Oct 2014 10:55:36 +0200
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children
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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 #ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
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26 #define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/chunkedList.hpp"
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30
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31 class Metadata;
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32
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33 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
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34
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35 // Helper class to mark and unmark metadata used on the stack as either handles
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36 // or executing methods, so that it can't be deleted during class redefinition
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37 // and class unloading.
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38 // This is also used for other things that can be deallocated, like class
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39 // metadata during parsing, relocated methods, and methods in backtraces.
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40 class MetadataOnStackMark : public StackObj {
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41 NOT_PRODUCT(static bool _is_active;)
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42
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43 static volatile MetadataOnStackBuffer* _used_buffers;
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44 static volatile MetadataOnStackBuffer* _free_buffers;
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45
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46 static MetadataOnStackBuffer* allocate_buffer();
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47 static void retire_buffer(MetadataOnStackBuffer* buffer);
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48
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49 public:
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50 MetadataOnStackMark(bool visit_code_cache);
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51 ~MetadataOnStackMark();
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52
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53 static void record(Metadata* m, Thread* thread);
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54 static void retire_buffer_for_thread(Thread* thread);
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55 static bool has_buffer_for_thread(Thread* thread);
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56 };
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57
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58 #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP