1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP 26 #define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP 27 28 #include "memory/allocation.hpp" 29 #include "runtime/thread.hpp" 30 #include "services/memRecorder.hpp" 31 32 // Maximum MAX_GENERATIONS generation data can be tracked. 33 #define MAX_GENERATIONS 512 34 35 class GenerationData : public _ValueObj { 36 private: 37 int _number_of_classes; 38 MemRecorder* _recorder_list; 39 40 public: 41 GenerationData(): _number_of_classes(0), _recorder_list(NULL) { } 42 43 inline int number_of_classes() const { return _number_of_classes; } 44 inline void set_number_of_classes(long num) { _number_of_classes = num; } 45 46 inline MemRecorder* next_recorder() { 47 if (_recorder_list == NULL) { 48 return NULL; 49 } else { 50 MemRecorder* tmp = _recorder_list; 51 _recorder_list = _recorder_list->next(); 52 return tmp; 53 } 54 } 55 56 inline bool has_more_recorder() const { 57 return (_recorder_list != NULL); 58 } 59 60 // add recorders to this generation 61 void add_recorders(MemRecorder* head) { 62 if (head != NULL) { 63 if (_recorder_list == NULL) { 64 _recorder_list = head; 65 } else { 66 MemRecorder* tmp = _recorder_list; 67 for (; tmp->next() != NULL; tmp = tmp->next()); 68 tmp->set_next(head); 69 } 70 } 71 } 72 73 void reset(); 74 75 NOT_PRODUCT(MemRecorder* peek() const { return _recorder_list; }) 76 }; 77 78 class MemTrackWorker : public NamedThread { 79 private: 80 // circular buffer. This buffer contains generation data to be merged into global 81 // snaphsot. 82 // Each slot holds a generation 83 GenerationData _gen[MAX_GENERATIONS]; 84 int _head, _tail; // head and tail pointers to above circular buffer 85 86 bool _has_error; 87 88 public: 89 MemTrackWorker(); 90 ~MemTrackWorker(); 91 _NOINLINE_ void* operator new(size_t size); 92 _NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant); 93 94 void start(); 95 void run(); 96 97 inline bool has_error() const { return _has_error; } 98 99 // task at synchronization point 100 void at_sync_point(MemRecorder* pending_recorders, int number_of_classes); 101 102 // for debugging purpose, they are not thread safe. 103 NOT_PRODUCT(static int count_recorder(const MemRecorder* head);) 104 NOT_PRODUCT(int count_pending_recorders() const;) 105 106 NOT_PRODUCT(int _sync_point_count;) 107 NOT_PRODUCT(int _merge_count;) 108 NOT_PRODUCT(int _last_gen_in_use;) 109 110 inline int generations_in_use() const { 111 return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1)); 112 } 113 }; 114 115 #endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP