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1 /*
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2 * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_concurrentG1RefineThread.cpp.incl"
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27
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28 // ======= Concurrent Mark Thread ========
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29
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30 // The CM thread is created when the G1 garbage collector is used
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31
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32 ConcurrentG1RefineThread::
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794
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33 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next, int worker_id) :
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342
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34 ConcurrentGCThread(),
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794
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35 _worker_id(worker_id),
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36 _active(false),
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37 _next(next),
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342
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38 _cg1r(cg1r),
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39 _vtime_accum(0.0),
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40 _co_tracker(G1CRGroup),
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41 _interval_ms(5.0)
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42 {
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43 create_and_start();
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44 }
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45
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46 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() {
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47 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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48 G1CollectorPolicy* g1p = g1h->g1_policy();
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49 if (g1p->adaptive_young_list_length()) {
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50 int regions_visited = 0;
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51
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52 g1h->young_list_rs_length_sampling_init();
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53 while (g1h->young_list_rs_length_sampling_more()) {
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54 g1h->young_list_rs_length_sampling_next();
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55 ++regions_visited;
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56
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57 // we try to yield every time we visit 10 regions
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58 if (regions_visited == 10) {
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59 if (_sts.should_yield()) {
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60 _sts.yield("G1 refine");
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61 // we just abandon the iteration
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62 break;
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63 }
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64 regions_visited = 0;
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65 }
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66 }
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67
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68 g1p->check_prediction_validity();
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69 }
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70 }
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71
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72 void ConcurrentG1RefineThread::run() {
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73 initialize_in_thread();
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74 _vtime_start = os::elapsedVTime();
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75 wait_for_universe_init();
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76
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77 _co_tracker.enable();
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78 _co_tracker.start();
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79
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80 while (!_should_terminate) {
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794
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81 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
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82 // Wait for completed log buffers to exist.
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83 {
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84 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
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85 while (((_worker_id == 0 && !dcqs.process_completed_buffers()) ||
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86 (_worker_id > 0 && !is_active())) &&
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87 !_should_terminate) {
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88 DirtyCardQ_CBL_mon->wait(Mutex::_no_safepoint_check_flag);
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89 }
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90 }
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91
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92 if (_should_terminate) {
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93 return;
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94 }
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95
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96 // Now we take them off (this doesn't hold locks while it applies
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97 // closures.) (If we did a full collection, then we'll do a full
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98 // traversal.
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99 _sts.join();
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100 int n_logs = 0;
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101 int lower_limit = 0;
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102 double start_vtime_sec; // only used when G1SmoothConcRefine is on
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103 int prev_buffer_num; // only used when G1SmoothConcRefine is on
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104 // This thread activation threshold
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105 int threshold = DCQBarrierProcessCompletedThreshold * _worker_id;
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106 // Next thread activation threshold
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107 int next_threshold = threshold + DCQBarrierProcessCompletedThreshold;
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108 int deactivation_threshold = MAX2<int>(threshold - DCQBarrierProcessCompletedThreshold / 2, 0);
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109
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110 if (G1SmoothConcRefine) {
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111 lower_limit = 0;
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112 start_vtime_sec = os::elapsedVTime();
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113 prev_buffer_num = (int) dcqs.completed_buffers_num();
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342
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114 } else {
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794
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115 lower_limit = DCQBarrierProcessCompletedThreshold / 4; // For now.
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342
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116 }
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794
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117 while (dcqs.apply_closure_to_completed_buffer(_worker_id, lower_limit)) {
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118 double end_vtime_sec;
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119 double elapsed_vtime_sec;
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120 int elapsed_vtime_ms;
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121 int curr_buffer_num = (int) dcqs.completed_buffers_num();
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122
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123 if (G1SmoothConcRefine) {
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124 end_vtime_sec = os::elapsedVTime();
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125 elapsed_vtime_sec = end_vtime_sec - start_vtime_sec;
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126 elapsed_vtime_ms = (int) (elapsed_vtime_sec * 1000.0);
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127
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128 if (curr_buffer_num > prev_buffer_num ||
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129 curr_buffer_num > next_threshold) {
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130 decreaseInterval(elapsed_vtime_ms);
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131 } else if (curr_buffer_num < prev_buffer_num) {
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132 increaseInterval(elapsed_vtime_ms);
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133 }
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134 }
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135 if (_worker_id == 0) {
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136 sample_young_list_rs_lengths();
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137 } else if (curr_buffer_num < deactivation_threshold) {
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138 // If the number of the buffer has fallen below our threshold
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139 // we should deactivate. The predecessor will reactivate this
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140 // thread should the number of the buffers cross the threshold again.
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141 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
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142 deactivate();
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143 if (G1TraceConcurrentRefinement) {
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144 gclog_or_tty->print_cr("G1-Refine-deactivated worker %d", _worker_id);
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145 }
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146 break;
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147 }
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148 _co_tracker.update(false);
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149
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150 // Check if we need to activate the next thread.
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151 if (curr_buffer_num > next_threshold && _next != NULL && !_next->is_active()) {
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152 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
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153 _next->activate();
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154 DirtyCardQ_CBL_mon->notify_all();
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155 if (G1TraceConcurrentRefinement) {
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156 gclog_or_tty->print_cr("G1-Refine-activated worker %d", _next->_worker_id);
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157 }
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158 }
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159
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160 if (G1SmoothConcRefine) {
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161 prev_buffer_num = curr_buffer_num;
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162 _sts.leave();
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163 os::sleep(Thread::current(), (jlong) _interval_ms, false);
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164 _sts.join();
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165 start_vtime_sec = os::elapsedVTime();
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166 }
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167 n_logs++;
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168 }
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169 _co_tracker.update(false);
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342
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170 _sts.leave();
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794
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171
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342
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172 if (os::supports_vtime()) {
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173 _vtime_accum = (os::elapsedVTime() - _vtime_start);
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174 } else {
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175 _vtime_accum = 0.0;
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176 }
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177 }
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178 _sts.join();
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179 _co_tracker.update(true);
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180 _sts.leave();
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181 assert(_should_terminate, "just checking");
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182
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183 terminate();
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184 }
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185
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186
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187 void ConcurrentG1RefineThread::yield() {
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751
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188 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield");
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342
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189 _sts.yield("G1 refine");
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751
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190 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield-end");
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342
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191 }
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192
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193 void ConcurrentG1RefineThread::stop() {
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194 // it is ok to take late safepoints here, if needed
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195 {
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196 MutexLockerEx mu(Terminator_lock);
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197 _should_terminate = true;
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198 }
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199
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200 {
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201 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
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202 DirtyCardQ_CBL_mon->notify_all();
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203 }
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204
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205 {
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206 MutexLockerEx mu(Terminator_lock);
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207 while (!_has_terminated) {
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208 Terminator_lock->wait();
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209 }
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210 }
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751
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211 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-stop");
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342
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212 }
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213
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214 void ConcurrentG1RefineThread::print() {
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215 gclog_or_tty->print("\"Concurrent G1 Refinement Thread\" ");
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216 Thread::print();
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217 gclog_or_tty->cr();
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218 }
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