1 /* 2 * Copyright (c) 2012, 2018, 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 #include "precompiled.hpp" 26 #include "gc/shared/gcTimer.hpp" 27 #include "utilities/growableArray.hpp" 28 29 // the "time" parameter for most functions 30 // has a default value set by Ticks::now() 31 32 void GCTimer::register_gc_start(const Ticks& time) { 33 _time_partitions.clear(); 34 _gc_start = time; 35 } 36 37 void GCTimer::register_gc_end(const Ticks& time) { 38 assert(!_time_partitions.has_active_phases(), 39 "We should have ended all started phases, before ending the GC"); 40 41 _gc_end = time; 42 } 43 44 void GCTimer::register_gc_pause_start(const char* name, const Ticks& time) { 45 _time_partitions.report_gc_phase_start(name, time); 46 } 47 48 void GCTimer::register_gc_pause_end(const Ticks& time) { 49 _time_partitions.report_gc_phase_end(time); 50 } 51 52 void GCTimer::register_gc_phase_start(const char* name, const Ticks& time) { 53 _time_partitions.report_gc_phase_start(name, time); 54 } 55 56 void GCTimer::register_gc_phase_end(const Ticks& time) { 57 _time_partitions.report_gc_phase_end(time); 58 } 59 60 void STWGCTimer::register_gc_start(const Ticks& time) { 61 GCTimer::register_gc_start(time); 62 register_gc_pause_start("GC Pause", time); 63 } 64 65 void STWGCTimer::register_gc_end(const Ticks& time) { 66 register_gc_pause_end(time); 67 GCTimer::register_gc_end(time); 68 } 69 70 void ConcurrentGCTimer::register_gc_pause_start(const char* name, const Ticks& time) { 71 assert(!_is_concurrent_phase_active, "A pause phase can't be started while a concurrent phase is active."); 72 GCTimer::register_gc_pause_start(name, time); 73 } 74 75 void ConcurrentGCTimer::register_gc_pause_end(const Ticks& time) { 76 assert(!_is_concurrent_phase_active, "A pause phase can't be ended while a concurrent phase is active."); 77 GCTimer::register_gc_pause_end(time); 78 } 79 80 void ConcurrentGCTimer::register_gc_concurrent_start(const char* name, const Ticks& time) { 81 assert(!_is_concurrent_phase_active, "A concurrent phase is already active."); 82 _time_partitions.report_gc_phase_start(name, time, GCPhase::ConcurrentPhaseType); 83 _is_concurrent_phase_active = true; 84 } 85 86 void ConcurrentGCTimer::register_gc_concurrent_end(const Ticks& time) { 87 assert(_is_concurrent_phase_active, "A concurrent phase is not active."); 88 _time_partitions.report_gc_phase_end(time, GCPhase::ConcurrentPhaseType); 89 _is_concurrent_phase_active = false; 90 } 91 92 void PhasesStack::clear() { 93 _next_phase_level = 0; 94 } 95 96 void PhasesStack::push(int phase_index) { 97 assert(_next_phase_level < PHASE_LEVELS, "Overflow"); 98 99 _phase_indices[_next_phase_level] = phase_index; 100 _next_phase_level++; 101 } 102 103 int PhasesStack::pop() { 104 assert(_next_phase_level > 0, "Underflow"); 105 106 _next_phase_level--; 107 return _phase_indices[_next_phase_level]; 108 } 109 110 int PhasesStack::count() const { 111 return _next_phase_level; 112 } 113 114 TimePartitions::TimePartitions() { 115 _phases = new (ResourceObj::C_HEAP, mtGC) GrowableArray<GCPhase>(INITIAL_CAPACITY, true, mtGC); 116 clear(); 117 } 118 119 TimePartitions::~TimePartitions() { 120 delete _phases; 121 _phases = NULL; 122 } 123 124 void TimePartitions::clear() { 125 _phases->clear(); 126 _active_phases.clear(); 127 _sum_of_pauses = Tickspan(); 128 _longest_pause = Tickspan(); 129 } 130 131 void TimePartitions::report_gc_phase_start(const char* name, const Ticks& time, GCPhase::PhaseType type) { 132 assert(_phases->length() <= 1000, "Too many recored phases?"); 133 134 int level = _active_phases.count(); 135 136 GCPhase phase; 137 phase.set_type(type); 138 phase.set_level(level); 139 phase.set_name(name); 140 phase.set_start(time); 141 142 int index = _phases->append(phase); 143 144 _active_phases.push(index); 145 } 146 147 void TimePartitions::update_statistics(GCPhase* phase) { 148 if ((phase->type() == GCPhase::PausePhaseType) && (phase->level() == 0)) { 149 const Tickspan pause = phase->end() - phase->start(); 150 _sum_of_pauses += pause; 151 _longest_pause = MAX2(pause, _longest_pause); 152 } 153 } 154 155 void TimePartitions::report_gc_phase_end(const Ticks& time, GCPhase::PhaseType type) { 156 int phase_index = _active_phases.pop(); 157 GCPhase* phase = _phases->adr_at(phase_index); 158 phase->set_end(time); 159 update_statistics(phase); 160 } 161 162 int TimePartitions::num_phases() const { 163 return _phases->length(); 164 } 165 166 GCPhase* TimePartitions::phase_at(int index) const { 167 assert(index >= 0, "Out of bounds"); 168 assert(index < _phases->length(), "Out of bounds"); 169 170 return _phases->adr_at(index); 171 } 172 173 bool TimePartitions::has_active_phases() { 174 return _active_phases.count() > 0; 175 } 176 177 bool TimePartitionPhasesIterator::has_next() { 178 return _next < _time_partitions->num_phases(); 179 } 180 181 GCPhase* TimePartitionPhasesIterator::next() { 182 assert(has_next(), "Must have phases left"); 183 return _time_partitions->phase_at(_next++); 184 } 185 186