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1 /* |
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2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "gc/g1/g1CollectedHeap.inline.hpp" |
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27 #include "gc/g1/g1IHOPControl.hpp" |
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28 #include "gc/g1/g1Predictions.hpp" |
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29 #include "gc/shared/gcTrace.hpp" |
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30 #include "logging/log.hpp" |
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31 |
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32 G1IHOPControl::G1IHOPControl(double initial_ihop_percent) : |
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33 _initial_ihop_percent(initial_ihop_percent), |
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34 _target_occupancy(0), |
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35 _last_allocated_bytes(0), |
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36 _last_allocation_time_s(0.0) |
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37 { |
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38 assert(_initial_ihop_percent >= 0.0 && _initial_ihop_percent <= 100.0, "Initial IHOP value must be between 0 and 100 but is %.3f", initial_ihop_percent); |
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39 } |
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40 |
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41 void G1IHOPControl::update_target_occupancy(size_t new_target_occupancy) { |
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42 log_debug(gc, ihop)("Target occupancy update: old: " SIZE_FORMAT "B, new: " SIZE_FORMAT "B", |
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43 _target_occupancy, new_target_occupancy); |
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44 _target_occupancy = new_target_occupancy; |
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45 } |
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46 |
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47 void G1IHOPControl::update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) { |
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48 assert(allocation_time_s >= 0.0, "Allocation time must be positive but is %.3f", allocation_time_s); |
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49 |
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50 _last_allocation_time_s = allocation_time_s; |
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51 _last_allocated_bytes = allocated_bytes; |
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52 } |
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53 |
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54 void G1IHOPControl::print() { |
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55 assert(_target_occupancy > 0, "Target occupancy still not updated yet."); |
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56 size_t cur_conc_mark_start_threshold = get_conc_mark_start_threshold(); |
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57 log_debug(gc, ihop)("Basic information (value update), threshold: " SIZE_FORMAT "B (%1.2f), target occupancy: " SIZE_FORMAT "B, current occupancy: " SIZE_FORMAT "B, " |
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58 "recent allocation size: " SIZE_FORMAT "B, recent allocation duration: %1.2fms, recent old gen allocation rate: %1.2fB/s, recent marking phase length: %1.2fms", |
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59 cur_conc_mark_start_threshold, |
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60 cur_conc_mark_start_threshold * 100.0 / _target_occupancy, |
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61 _target_occupancy, |
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62 G1CollectedHeap::heap()->used(), |
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63 _last_allocated_bytes, |
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64 _last_allocation_time_s * 1000.0, |
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65 _last_allocation_time_s > 0.0 ? _last_allocated_bytes / _last_allocation_time_s : 0.0, |
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66 last_marking_length_s() * 1000.0); |
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67 } |
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68 |
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69 void G1IHOPControl::send_trace_event(G1NewTracer* tracer) { |
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70 assert(_target_occupancy > 0, "Target occupancy still not updated yet."); |
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71 tracer->report_basic_ihop_statistics(get_conc_mark_start_threshold(), |
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72 _target_occupancy, |
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73 G1CollectedHeap::heap()->used(), |
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74 _last_allocated_bytes, |
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75 _last_allocation_time_s, |
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76 last_marking_length_s()); |
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77 } |
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78 |
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79 G1StaticIHOPControl::G1StaticIHOPControl(double ihop_percent) : |
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80 G1IHOPControl(ihop_percent), |
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81 _last_marking_length_s(0.0) { |
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82 } |
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83 |
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84 G1AdaptiveIHOPControl::G1AdaptiveIHOPControl(double ihop_percent, |
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85 G1Predictions const* predictor, |
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86 size_t heap_reserve_percent, |
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87 size_t heap_waste_percent) : |
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88 G1IHOPControl(ihop_percent), |
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89 _predictor(predictor), |
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90 _marking_times_s(10, 0.95), |
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91 _allocation_rate_s(10, 0.95), |
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92 _last_unrestrained_young_size(0), |
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93 _heap_reserve_percent(heap_reserve_percent), |
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94 _heap_waste_percent(heap_waste_percent) |
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95 { |
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96 } |
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97 |
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98 size_t G1AdaptiveIHOPControl::actual_target_threshold() const { |
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99 guarantee(_target_occupancy > 0, "Target occupancy still not updated yet."); |
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100 // The actual target threshold takes the heap reserve and the expected waste in |
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101 // free space into account. |
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102 // _heap_reserve is that part of the total heap capacity that is reserved for |
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103 // eventual promotion failure. |
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104 // _heap_waste is the amount of space will never be reclaimed in any |
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105 // heap, so can not be used for allocation during marking and must always be |
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106 // considered. |
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107 |
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108 double safe_total_heap_percentage = MIN2((double)(_heap_reserve_percent + _heap_waste_percent), 100.0); |
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109 |
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110 return (size_t)MIN2( |
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111 G1CollectedHeap::heap()->max_capacity() * (100.0 - safe_total_heap_percentage) / 100.0, |
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112 _target_occupancy * (100.0 - _heap_waste_percent) / 100.0 |
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113 ); |
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114 } |
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115 |
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116 bool G1AdaptiveIHOPControl::have_enough_data_for_prediction() const { |
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117 return ((size_t)_marking_times_s.num() >= G1AdaptiveIHOPNumInitialSamples) && |
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118 ((size_t)_allocation_rate_s.num() >= G1AdaptiveIHOPNumInitialSamples); |
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119 } |
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120 |
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121 size_t G1AdaptiveIHOPControl::get_conc_mark_start_threshold() { |
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122 if (have_enough_data_for_prediction()) { |
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123 double pred_marking_time = _predictor->get_new_prediction(&_marking_times_s); |
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124 double pred_promotion_rate = _predictor->get_new_prediction(&_allocation_rate_s); |
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125 size_t pred_promotion_size = (size_t)(pred_marking_time * pred_promotion_rate); |
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126 |
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127 size_t predicted_needed_bytes_during_marking = |
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128 pred_promotion_size + |
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129 // In reality we would need the maximum size of the young gen during |
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130 // marking. This is a conservative estimate. |
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131 _last_unrestrained_young_size; |
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132 |
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133 size_t internal_threshold = actual_target_threshold(); |
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134 size_t predicted_initiating_threshold = predicted_needed_bytes_during_marking < internal_threshold ? |
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135 internal_threshold - predicted_needed_bytes_during_marking : |
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136 0; |
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137 return predicted_initiating_threshold; |
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138 } else { |
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139 // Use the initial value. |
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140 return (size_t)(_initial_ihop_percent * _target_occupancy / 100.0); |
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141 } |
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142 } |
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143 |
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144 void G1AdaptiveIHOPControl::update_allocation_info(double allocation_time_s, |
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145 size_t allocated_bytes, |
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146 size_t additional_buffer_size) { |
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147 G1IHOPControl::update_allocation_info(allocation_time_s, allocated_bytes, additional_buffer_size); |
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148 |
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149 double allocation_rate = (double) allocated_bytes / allocation_time_s; |
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150 _allocation_rate_s.add(allocation_rate); |
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151 |
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152 _last_unrestrained_young_size = additional_buffer_size; |
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153 } |
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154 |
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155 void G1AdaptiveIHOPControl::update_marking_length(double marking_length_s) { |
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156 assert(marking_length_s >= 0.0, "Marking length must be larger than zero but is %.3f", marking_length_s); |
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157 _marking_times_s.add(marking_length_s); |
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158 } |
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159 |
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160 void G1AdaptiveIHOPControl::print() { |
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161 G1IHOPControl::print(); |
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162 size_t actual_target = actual_target_threshold(); |
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163 log_debug(gc, ihop)("Adaptive IHOP information (value update), threshold: " SIZE_FORMAT "B (%1.2f), internal target occupancy: " SIZE_FORMAT "B, " |
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164 "occupancy: " SIZE_FORMAT "B, additional buffer size: " SIZE_FORMAT "B, predicted old gen allocation rate: %1.2fB/s, " |
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165 "predicted marking phase length: %1.2fms, prediction active: %s", |
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166 get_conc_mark_start_threshold(), |
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167 percent_of(get_conc_mark_start_threshold(), actual_target), |
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168 actual_target, |
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169 G1CollectedHeap::heap()->used(), |
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170 _last_unrestrained_young_size, |
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171 _predictor->get_new_prediction(&_allocation_rate_s), |
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172 _predictor->get_new_prediction(&_marking_times_s) * 1000.0, |
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173 have_enough_data_for_prediction() ? "true" : "false"); |
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174 } |
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175 |
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176 void G1AdaptiveIHOPControl::send_trace_event(G1NewTracer* tracer) { |
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177 G1IHOPControl::send_trace_event(tracer); |
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178 tracer->report_adaptive_ihop_statistics(get_conc_mark_start_threshold(), |
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179 actual_target_threshold(), |
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180 G1CollectedHeap::heap()->used(), |
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181 _last_unrestrained_young_size, |
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182 _predictor->get_new_prediction(&_allocation_rate_s), |
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183 _predictor->get_new_prediction(&_marking_times_s), |
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184 have_enough_data_for_prediction()); |
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185 } |