342
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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/_concurrentMarkThread.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 SurrogateLockerThread*
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33 ConcurrentMarkThread::_slt = NULL;
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34
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35 ConcurrentMarkThread::ConcurrentMarkThread(ConcurrentMark* cm) :
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36 ConcurrentGCThread(),
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37 _cm(cm),
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38 _started(false),
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39 _in_progress(false),
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40 _vtime_accum(0.0),
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41 _vtime_mark_accum(0.0),
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42 _vtime_count_accum(0.0)
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43 {
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44 create_and_start();
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45 }
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46
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47 class CMCheckpointRootsInitialClosure: public VoidClosure {
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48
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49 ConcurrentMark* _cm;
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50 public:
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51
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52 CMCheckpointRootsInitialClosure(ConcurrentMark* cm) :
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53 _cm(cm) {}
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54
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55 void do_void(){
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56 _cm->checkpointRootsInitial();
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57 }
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58 };
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59
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60 class CMCheckpointRootsFinalClosure: public VoidClosure {
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61
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62 ConcurrentMark* _cm;
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63 public:
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64
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65 CMCheckpointRootsFinalClosure(ConcurrentMark* cm) :
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66 _cm(cm) {}
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67
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68 void do_void(){
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69 _cm->checkpointRootsFinal(false); // !clear_all_soft_refs
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70 }
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71 };
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72
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73 class CMCleanUp: public VoidClosure {
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74 ConcurrentMark* _cm;
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75 public:
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76
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77 CMCleanUp(ConcurrentMark* cm) :
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78 _cm(cm) {}
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79
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80 void do_void(){
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81 _cm->cleanup();
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82 }
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83 };
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84
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85
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86
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87 void ConcurrentMarkThread::run() {
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88 initialize_in_thread();
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89 _vtime_start = os::elapsedVTime();
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90 wait_for_universe_init();
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91
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92 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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93 G1CollectorPolicy* g1_policy = g1->g1_policy();
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94 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker();
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95 Thread *current_thread = Thread::current();
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96
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97 while (!_should_terminate) {
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98 // wait until started is set.
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99 sleepBeforeNextCycle();
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100 {
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101 ResourceMark rm;
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102 HandleMark hm;
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103 double cycle_start = os::elapsedVTime();
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104 double mark_start_sec = os::elapsedTime();
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105 char verbose_str[128];
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106
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107 if (PrintGC) {
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108 gclog_or_tty->date_stamp(PrintGCDateStamps);
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109 gclog_or_tty->stamp(PrintGCTimeStamps);
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110 tty->print_cr("[GC concurrent-mark-start]");
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111 }
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112
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113 if (!g1_policy->in_young_gc_mode()) {
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114 // this ensures the flag is not set if we bail out of the marking
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115 // cycle; normally the flag is cleared immediately after cleanup
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116 g1->set_marking_complete();
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117
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118 if (g1_policy->adaptive_young_list_length()) {
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119 double now = os::elapsedTime();
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120 double init_prediction_ms = g1_policy->predict_init_time_ms();
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121 jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms);
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122 os::sleep(current_thread, sleep_time_ms, false);
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123 }
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124
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125 // We don't have to skip here if we've been asked to restart, because
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126 // in the worst case we just enqueue a new VM operation to start a
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127 // marking. Note that the init operation resets has_aborted()
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128 CMCheckpointRootsInitialClosure init_cl(_cm);
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129 strcpy(verbose_str, "GC initial-mark");
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130 VM_CGC_Operation op(&init_cl, verbose_str);
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131 VMThread::execute(&op);
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132 }
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133
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134 int iter = 0;
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135 do {
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136 iter++;
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137 if (!cm()->has_aborted()) {
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138 _cm->markFromRoots();
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139 } else {
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140 if (TraceConcurrentMark)
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141 gclog_or_tty->print_cr("CM-skip-mark-from-roots");
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142 }
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143
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144 double mark_end_time = os::elapsedVTime();
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145 double mark_end_sec = os::elapsedTime();
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146 _vtime_mark_accum += (mark_end_time - cycle_start);
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147 if (!cm()->has_aborted()) {
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148 if (g1_policy->adaptive_young_list_length()) {
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149 double now = os::elapsedTime();
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150 double remark_prediction_ms = g1_policy->predict_remark_time_ms();
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151 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms);
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152 os::sleep(current_thread, sleep_time_ms, false);
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153 }
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154
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155 if (PrintGC) {
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156 gclog_or_tty->date_stamp(PrintGCDateStamps);
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157 gclog_or_tty->stamp(PrintGCTimeStamps);
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158 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]",
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159 mark_end_sec - mark_start_sec);
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160 }
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161
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162 CMCheckpointRootsFinalClosure final_cl(_cm);
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163 sprintf(verbose_str, "GC remark");
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164 VM_CGC_Operation op(&final_cl, verbose_str);
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165 VMThread::execute(&op);
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166 } else {
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167 if (TraceConcurrentMark)
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168 gclog_or_tty->print_cr("CM-skip-remark");
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169 }
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170 if (cm()->restart_for_overflow() &&
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171 G1TraceMarkStackOverflow) {
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172 gclog_or_tty->print_cr("Restarting conc marking because of MS overflow "
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173 "in remark (restart #%d).", iter);
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174 }
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175
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176 if (cm()->restart_for_overflow()) {
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177 if (PrintGC) {
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178 gclog_or_tty->date_stamp(PrintGCDateStamps);
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179 gclog_or_tty->stamp(PrintGCTimeStamps);
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180 gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]");
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181 }
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182 }
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183 } while (cm()->restart_for_overflow());
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184 double counting_start_time = os::elapsedVTime();
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185
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186 // YSR: These look dubious (i.e. redundant) !!! FIX ME
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187 slt()->manipulatePLL(SurrogateLockerThread::acquirePLL);
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188 slt()->manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL);
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189
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190 if (!cm()->has_aborted()) {
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191 double count_start_sec = os::elapsedTime();
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192 if (PrintGC) {
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193 gclog_or_tty->date_stamp(PrintGCDateStamps);
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194 gclog_or_tty->stamp(PrintGCTimeStamps);
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195 gclog_or_tty->print_cr("[GC concurrent-count-start]");
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196 }
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197
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198 _sts.join();
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199 _cm->calcDesiredRegions();
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200 _sts.leave();
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201
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202 if (!cm()->has_aborted()) {
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203 double count_end_sec = os::elapsedTime();
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204 if (PrintGC) {
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205 gclog_or_tty->date_stamp(PrintGCDateStamps);
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206 gclog_or_tty->stamp(PrintGCTimeStamps);
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207 gclog_or_tty->print_cr("[GC concurrent-count-end, %1.7lf]",
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208 count_end_sec - count_start_sec);
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209 }
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210 }
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211 } else {
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212 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-end-game");
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213 }
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214 double end_time = os::elapsedVTime();
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215 _vtime_count_accum += (end_time - counting_start_time);
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216 // Update the total virtual time before doing this, since it will try
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217 // to measure it to get the vtime for this marking. We purposely
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218 // neglect the presumably-short "completeCleanup" phase here.
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219 _vtime_accum = (end_time - _vtime_start);
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220 if (!cm()->has_aborted()) {
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221 if (g1_policy->adaptive_young_list_length()) {
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222 double now = os::elapsedTime();
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223 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms();
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224 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms);
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225 os::sleep(current_thread, sleep_time_ms, false);
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226 }
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227
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228 CMCleanUp cl_cl(_cm);
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229 sprintf(verbose_str, "GC cleanup");
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230 VM_CGC_Operation op(&cl_cl, verbose_str);
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231 VMThread::execute(&op);
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232 } else {
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233 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-cleanup");
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234 G1CollectedHeap::heap()->set_marking_complete();
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235 }
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236
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237 if (!cm()->has_aborted()) {
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238 double cleanup_start_sec = os::elapsedTime();
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239 if (PrintGC) {
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240 gclog_or_tty->date_stamp(PrintGCDateStamps);
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241 gclog_or_tty->stamp(PrintGCTimeStamps);
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242 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]");
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243 }
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244
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245 // Now do the remainder of the cleanup operation.
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246 _sts.join();
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247 _cm->completeCleanup();
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248 if (!cm()->has_aborted()) {
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249 g1_policy->record_concurrent_mark_cleanup_completed();
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250
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251 double cleanup_end_sec = os::elapsedTime();
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252 if (PrintGC) {
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253 gclog_or_tty->date_stamp(PrintGCDateStamps);
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254 gclog_or_tty->stamp(PrintGCTimeStamps);
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255 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]",
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256 cleanup_end_sec - cleanup_start_sec);
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257 }
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258 }
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259 _sts.leave();
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260 }
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261 // We're done: no more unclean regions coming.
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262 G1CollectedHeap::heap()->set_unclean_regions_coming(false);
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263
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264 if (cm()->has_aborted()) {
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265 if (PrintGC) {
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266 gclog_or_tty->date_stamp(PrintGCDateStamps);
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267 gclog_or_tty->stamp(PrintGCTimeStamps);
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268 gclog_or_tty->print_cr("[GC concurrent-mark-abort]");
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269 }
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270 }
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271
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272 _sts.join();
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273 _cm->disable_co_trackers();
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274 _sts.leave();
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275
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276 // we now want to allow clearing of the marking bitmap to be
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277 // suspended by a collection pause.
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278 _sts.join();
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279 _cm->clearNextBitmap();
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280 _sts.leave();
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281 }
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282 }
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283 assert(_should_terminate, "just checking");
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284
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285 terminate();
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286 }
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287
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288
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289 void ConcurrentMarkThread::yield() {
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290 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield");
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291 _sts.yield("Concurrent Mark");
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292 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield-end");
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293 }
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294
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295 void ConcurrentMarkThread::stop() {
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296 // it is ok to take late safepoints here, if needed
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297 MutexLockerEx mu(Terminator_lock);
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298 _should_terminate = true;
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299 while (!_has_terminated) {
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300 Terminator_lock->wait();
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301 }
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302 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-stop");
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303 }
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304
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305 void ConcurrentMarkThread::print() {
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306 gclog_or_tty->print("\"Concurrent Mark GC Thread\" ");
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307 Thread::print();
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308 gclog_or_tty->cr();
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309 }
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310
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311 void ConcurrentMarkThread::sleepBeforeNextCycle() {
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312 clear_in_progress();
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313 // We join here because we don't want to do the "shouldConcurrentMark()"
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314 // below while the world is otherwise stopped.
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315 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
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316 while (!started()) {
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317 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-sleeping");
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318 CGC_lock->wait(Mutex::_no_safepoint_check_flag);
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319 }
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320 set_in_progress();
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321 clear_started();
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322 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-starting");
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323
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324 return;
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325 }
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326
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327 // Note: this method, although exported by the ConcurrentMarkSweepThread,
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328 // which is a non-JavaThread, can only be called by a JavaThread.
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329 // Currently this is done at vm creation time (post-vm-init) by the
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330 // main/Primordial (Java)Thread.
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331 // XXX Consider changing this in the future to allow the CMS thread
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332 // itself to create this thread?
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333 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) {
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334 assert(_slt == NULL, "SLT already created");
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335 _slt = SurrogateLockerThread::make(THREAD);
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336 }
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