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6197
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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_SERVICES_MEM_TRACK_WORKER_HPP
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26 #define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "runtime/thread.hpp"
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30 #include "services/memRecorder.hpp"
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31
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32 // Maximum MAX_GENERATIONS generation data can be tracked.
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33 #define MAX_GENERATIONS 512
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34
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35
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36 class MemTrackWorker : public NamedThread {
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37 private:
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38 // circular buffer. This buffer contains recorders to be merged into global
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39 // snaphsot.
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40 // Each slot holds a linked list of memory recorders, that contains one
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41 // generation of memory data.
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42 MemRecorder* _gen[MAX_GENERATIONS];
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43 int _head, _tail; // head and tail pointers to above circular buffer
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44
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45 bool _has_error;
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46
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47 public:
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48 MemTrackWorker();
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49 ~MemTrackWorker();
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50 _NOINLINE_ void* operator new(size_t size);
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51 _NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant);
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52
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53 void start();
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54 void run();
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55
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56 inline bool has_error() const { return _has_error; }
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57
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58 // task at synchronization point
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59 void at_sync_point(MemRecorder* pending_recorders);
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60
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61 // for debugging purpose, they are not thread safe.
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62 NOT_PRODUCT(static int count_recorder(const MemRecorder* head);)
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63 NOT_PRODUCT(int count_pending_recorders() const;)
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64
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65 NOT_PRODUCT(int _sync_point_count;)
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66 NOT_PRODUCT(int _merge_count;)
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67 NOT_PRODUCT(int _last_gen_in_use;)
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68
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69 inline int generations_in_use() const {
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6231
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70 return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1));
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6197
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71 }
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72 };
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73
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74 #endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
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