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1 /* |
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2 * Copyright (c) 2001, 2017, 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/g1ConcurrentRefine.hpp" |
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27 #include "gc/g1/g1ConcurrentRefineThread.hpp" |
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28 #include "gc/g1/g1CollectedHeap.inline.hpp" |
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29 #include "gc/g1/g1RemSet.hpp" |
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30 #include "gc/shared/suspendibleThreadSet.hpp" |
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31 #include "logging/log.hpp" |
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32 #include "memory/resourceArea.hpp" |
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33 #include "runtime/handles.inline.hpp" |
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34 #include "runtime/mutexLocker.hpp" |
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35 |
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36 G1ConcurrentRefineThread::G1ConcurrentRefineThread(G1ConcurrentRefine* cr, |
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37 G1ConcurrentRefineThread *next, |
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38 uint worker_id_offset, |
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39 uint worker_id, |
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40 size_t activate, |
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41 size_t deactivate) : |
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42 ConcurrentGCThread(), |
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43 _worker_id_offset(worker_id_offset), |
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44 _worker_id(worker_id), |
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45 _active(false), |
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46 _next(next), |
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47 _monitor(NULL), |
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48 _cr(cr), |
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49 _vtime_accum(0.0), |
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50 _activation_threshold(activate), |
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51 _deactivation_threshold(deactivate) |
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52 { |
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53 |
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54 // Each thread has its own monitor. The i-th thread is responsible for signaling |
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55 // to thread i+1 if the number of buffers in the queue exceeds a threshold for this |
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56 // thread. Monitors are also used to wake up the threads during termination. |
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57 // The 0th (primary) worker is notified by mutator threads and has a special monitor. |
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58 if (!is_primary()) { |
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59 _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true, |
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60 Monitor::_safepoint_check_never); |
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61 } else { |
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62 _monitor = DirtyCardQ_CBL_mon; |
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63 } |
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64 |
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65 // set name |
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66 set_name("G1 Refine#%d", worker_id); |
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67 create_and_start(); |
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68 } |
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69 |
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70 void G1ConcurrentRefineThread::update_thresholds(size_t activate, |
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71 size_t deactivate) { |
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72 assert(deactivate < activate, "precondition"); |
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73 _activation_threshold = activate; |
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74 _deactivation_threshold = deactivate; |
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75 } |
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76 |
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77 void G1ConcurrentRefineThread::wait_for_completed_buffers() { |
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78 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
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79 while (!should_terminate() && !is_active()) { |
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80 _monitor->wait(Mutex::_no_safepoint_check_flag); |
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81 } |
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82 } |
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83 |
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84 bool G1ConcurrentRefineThread::is_active() { |
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85 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
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86 return is_primary() ? dcqs.process_completed_buffers() : _active; |
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87 } |
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88 |
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89 void G1ConcurrentRefineThread::activate() { |
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90 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
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91 if (!is_primary()) { |
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92 set_active(true); |
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93 } else { |
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94 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
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95 dcqs.set_process_completed(true); |
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96 } |
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97 _monitor->notify(); |
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98 } |
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99 |
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100 void G1ConcurrentRefineThread::deactivate() { |
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101 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
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102 if (!is_primary()) { |
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103 set_active(false); |
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104 } else { |
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105 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
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106 dcqs.set_process_completed(false); |
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107 } |
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108 } |
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109 |
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110 void G1ConcurrentRefineThread::run_service() { |
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111 _vtime_start = os::elapsedVTime(); |
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112 |
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113 while (!should_terminate()) { |
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114 // Wait for work |
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115 wait_for_completed_buffers(); |
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116 if (should_terminate()) { |
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117 break; |
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118 } |
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119 |
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120 size_t buffers_processed = 0; |
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121 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
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122 log_debug(gc, refine)("Activated %d, on threshold: " SIZE_FORMAT ", current: " SIZE_FORMAT, |
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123 _worker_id, _activation_threshold, dcqs.completed_buffers_num()); |
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124 |
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125 { |
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126 SuspendibleThreadSetJoiner sts_join; |
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127 |
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128 while (!should_terminate()) { |
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129 if (sts_join.should_yield()) { |
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130 sts_join.yield(); |
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131 continue; // Re-check for termination after yield delay. |
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132 } |
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133 |
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134 size_t curr_buffer_num = dcqs.completed_buffers_num(); |
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135 // If the number of the buffers falls down into the yellow zone, |
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136 // that means that the transition period after the evacuation pause has ended. |
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137 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cr()->yellow_zone()) { |
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138 dcqs.set_completed_queue_padding(0); |
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139 } |
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140 |
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141 // Check if we need to activate the next thread. |
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142 if ((_next != NULL) && |
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143 !_next->is_active() && |
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144 (curr_buffer_num > _next->_activation_threshold)) { |
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145 _next->activate(); |
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146 } |
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147 |
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148 // Process the next buffer, if there are enough left. |
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149 if (!dcqs.refine_completed_buffer_concurrently(_worker_id + _worker_id_offset, _deactivation_threshold)) { |
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150 break; // Deactivate, number of buffers fell below threshold. |
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151 } |
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152 ++buffers_processed; |
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153 } |
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154 } |
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155 |
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156 deactivate(); |
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157 log_debug(gc, refine)("Deactivated %d, off threshold: " SIZE_FORMAT |
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158 ", current: " SIZE_FORMAT ", processed: " SIZE_FORMAT, |
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159 _worker_id, _deactivation_threshold, |
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160 dcqs.completed_buffers_num(), |
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161 buffers_processed); |
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162 |
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163 if (os::supports_vtime()) { |
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164 _vtime_accum = (os::elapsedVTime() - _vtime_start); |
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165 } else { |
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166 _vtime_accum = 0.0; |
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167 } |
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168 } |
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169 |
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170 log_debug(gc, refine)("Stopping %d", _worker_id); |
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171 } |
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172 |
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173 void G1ConcurrentRefineThread::stop_service() { |
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174 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
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175 _monitor->notify(); |
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176 } |