1 /* 2 * Copyright (c) 2012, 2013, 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_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP 27 28 #include "memory/allocation.hpp" 29 #include "prims/jni_md.h" 30 #include "utilities/macros.hpp" 31 #include "utilities/ticks.hpp" 32 33 class ConcurrentPhase; 34 class GCPhase; 35 class PausePhase; 36 37 template <class E> class GrowableArray; 38 39 class PhaseVisitor { 40 public: 41 virtual void visit(GCPhase* phase) = 0; 42 virtual void visit(PausePhase* phase) { visit((GCPhase*)phase); } 43 virtual void visit(ConcurrentPhase* phase) { visit((GCPhase*)phase); } 44 }; 45 46 class GCPhase { 47 const char* _name; 48 int _level; 49 Ticks _start; 50 Ticks _end; 51 52 public: 53 void set_name(const char* name) { _name = name; } 54 const char* name() const { return _name; } 55 56 int level() const { return _level; } 57 void set_level(int level) { _level = level; } 58 59 const Ticks start() const { return _start; } 60 void set_start(const Ticks& time) { _start = time; } 61 62 const Ticks end() const { return _end; } 63 void set_end(const Ticks& time) { _end = time; } 64 65 virtual void accept(PhaseVisitor* visitor) = 0; 66 }; 67 68 class PausePhase : public GCPhase { 69 public: 70 void accept(PhaseVisitor* visitor) { 71 visitor->visit(this); 72 } 73 }; 74 75 class ConcurrentPhase : public GCPhase { 76 void accept(PhaseVisitor* visitor) { 77 visitor->visit(this); 78 } 79 }; 80 81 class PhasesStack { 82 public: 83 // FIXME: Temporary set to 5 (used to be 4), since Reference processing needs it. 84 static const int PHASE_LEVELS = 5; 85 86 private: 87 int _phase_indices[PHASE_LEVELS]; 88 int _next_phase_level; 89 90 public: 91 PhasesStack() { clear(); } 92 void clear(); 93 94 void push(int phase_index); 95 int pop(); 96 int count() const; 97 }; 98 99 class TimePartitions { 100 static const int INITIAL_CAPACITY = 10; 101 102 // Currently we only support pause phases. 103 GrowableArray<PausePhase>* _phases; 104 PhasesStack _active_phases; 105 106 Tickspan _sum_of_pauses; 107 Tickspan _longest_pause; 108 109 public: 110 TimePartitions(); 111 ~TimePartitions(); 112 void clear(); 113 114 void report_gc_phase_start(const char* name, const Ticks& time = Ticks::now()); 115 void report_gc_phase_end(const Ticks& time = Ticks::now()); 116 117 int num_phases() const; 118 GCPhase* phase_at(int index) const; 119 120 const Tickspan sum_of_pauses() const { return _sum_of_pauses; } 121 const Tickspan longest_pause() const { return _longest_pause; } 122 123 bool has_active_phases(); 124 private: 125 void update_statistics(GCPhase* phase); 126 }; 127 128 class PhasesIterator { 129 public: 130 virtual bool has_next() = 0; 131 virtual GCPhase* next() = 0; 132 }; 133 134 class GCTimer : public ResourceObj { 135 NOT_PRODUCT(friend class GCTimerTest;) 136 protected: 137 Ticks _gc_start; 138 Ticks _gc_end; 139 TimePartitions _time_partitions; 140 141 public: 142 virtual void register_gc_start(const Ticks& time = Ticks::now()); 143 virtual void register_gc_end(const Ticks& time = Ticks::now()); 144 145 void register_gc_phase_start(const char* name, const Ticks& time = Ticks::now()); 146 void register_gc_phase_end(const Ticks& time = Ticks::now()); 147 148 const Ticks gc_start() const { return _gc_start; } 149 const Ticks gc_end() const { return _gc_end; } 150 151 TimePartitions* time_partitions() { return &_time_partitions; } 152 153 protected: 154 void register_gc_pause_start(const char* name, const Ticks& time = Ticks::now()); 155 void register_gc_pause_end(const Ticks& time = Ticks::now()); 156 }; 157 158 class STWGCTimer : public GCTimer { 159 public: 160 virtual void register_gc_start(const Ticks& time = Ticks::now()); 161 virtual void register_gc_end(const Ticks& time = Ticks::now()); 162 }; 163 164 class ConcurrentGCTimer : public GCTimer { 165 public: 166 void register_gc_pause_start(const char* name); 167 void register_gc_pause_end(); 168 }; 169 170 class TimePartitionPhasesIterator { 171 TimePartitions* _time_partitions; 172 int _next; 173 174 public: 175 TimePartitionPhasesIterator(TimePartitions* time_partitions) : _time_partitions(time_partitions), _next(0) { } 176 177 virtual bool has_next(); 178 virtual GCPhase* next(); 179 }; 180 181 182 /////////////// Unit tests /////////////// 183 184 #ifndef PRODUCT 185 186 class GCTimerAllTest { 187 public: 188 static void all(); 189 }; 190 191 #endif 192 193 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP