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