1 /* 2 * Copyright (c) 2012, 2017, 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_SHARED_GCTIMER_HPP 26 #define SHARE_VM_GC_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 }; 43 44 class GCPhase { 45 public: 46 enum PhaseType { 47 PausePhaseType = 0, 48 ConcurrentPhaseType = 1 49 }; 50 51 private: 52 const char* _name; 53 int _level; 54 Ticks _start; 55 Ticks _end; 56 PhaseType _type; 57 58 public: 59 void set_name(const char* name) { _name = name; } 60 const char* name() const { return _name; } 61 62 int level() const { return _level; } 63 void set_level(int level) { _level = level; } 64 65 const Ticks start() const { return _start; } 66 void set_start(const Ticks& time) { _start = time; } 67 68 const Ticks end() const { return _end; } 69 void set_end(const Ticks& time) { _end = time; } 70 71 PhaseType type() const { return _type; } 72 void set_type(PhaseType type) { _type = type; } 73 74 void accept(PhaseVisitor* visitor) { 75 visitor->visit(this); 76 } 77 }; 78 79 class PhasesStack { 80 public: 81 // Set to 6, since Reference processing needs it. 82 static const int PHASE_LEVELS = 6; 83 84 private: 85 int _phase_indices[PHASE_LEVELS]; 86 int _next_phase_level; 87 88 public: 89 PhasesStack() { clear(); } 90 void clear(); 91 92 void push(int phase_index); 93 int pop(); 94 int count() const; 95 }; 96 97 class TimePartitions { 98 static const int INITIAL_CAPACITY = 10; 99 100 GrowableArray<GCPhase>* _phases; 101 PhasesStack _active_phases; 102 103 Tickspan _sum_of_pauses; 104 Tickspan _longest_pause; 105 106 public: 107 TimePartitions(); 108 ~TimePartitions(); 109 void clear(); 110 111 void report_gc_phase_start(const char* name, const Ticks& time, GCPhase::PhaseType type=GCPhase::PausePhaseType); 112 void report_gc_phase_end(const Ticks& time, GCPhase::PhaseType type=GCPhase::PausePhaseType); 113 114 int num_phases() const; 115 GCPhase* phase_at(int index) const; 116 117 const Tickspan sum_of_pauses() const { return _sum_of_pauses; } 118 const Tickspan longest_pause() const { return _longest_pause; } 119 120 bool has_active_phases(); 121 122 private: 123 void update_statistics(GCPhase* phase); 124 }; 125 126 class PhasesIterator { 127 public: 128 virtual bool has_next() = 0; 129 virtual GCPhase* next() = 0; 130 }; 131 132 class GCTimer : public ResourceObj { 133 NOT_PRODUCT(friend class GCTimerTest;) 134 protected: 135 Ticks _gc_start; 136 Ticks _gc_end; 137 TimePartitions _time_partitions; 138 139 public: 140 virtual void register_gc_start(const Ticks& time = Ticks::now()); 141 virtual void register_gc_end(const Ticks& time = Ticks::now()); 142 143 void register_gc_phase_start(const char* name, const Ticks& time); 144 void register_gc_phase_end(const Ticks& time); 145 146 const Ticks gc_start() const { return _gc_start; } 147 const Ticks gc_end() const { return _gc_end; } 148 149 TimePartitions* time_partitions() { return &_time_partitions; } 150 151 protected: 152 void register_gc_pause_start(const char* name, const Ticks& time = Ticks::now()); 153 void register_gc_pause_end(const Ticks& time = Ticks::now()); 154 }; 155 156 class STWGCTimer : public GCTimer { 157 public: 158 virtual void register_gc_start(const Ticks& time = Ticks::now()); 159 virtual void register_gc_end(const Ticks& time = Ticks::now()); 160 }; 161 162 class ConcurrentGCTimer : public GCTimer { 163 // ConcurrentGCTimer can't be used if there is an overlap between a pause phase and a concurrent phase. 164 // _is_concurrent_phase_active is used to find above case. 165 bool _is_concurrent_phase_active; 166 167 public: 168 ConcurrentGCTimer(): GCTimer(), _is_concurrent_phase_active(false) {}; 169 170 void register_gc_pause_start(const char* name); 171 void register_gc_pause_end(); 172 173 void register_gc_concurrent_start(const char* name, const Ticks& time = Ticks::now()); 174 void register_gc_concurrent_end(const Ticks& time = Ticks::now()); 175 }; 176 177 class TimePartitionPhasesIterator { 178 TimePartitions* _time_partitions; 179 int _next; 180 181 public: 182 TimePartitionPhasesIterator(TimePartitions* time_partitions) : _time_partitions(time_partitions), _next(0) { } 183 184 virtual bool has_next(); 185 virtual GCPhase* next(); 186 }; 187 188 #endif // SHARE_VM_GC_SHARED_GCTIMER_HPP