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annotate src/share/vm/gc_implementation/g1/satbQueue.cpp @ 1840:4e0094bc41fa

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6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent Summary: Clear the concurrent marking "in progress" flag while the FullGCCount_lock is held. This avoids a race that can cause back to back System.gc() calls, when ExplicitGCInvokesConcurrent is enabled, to fail to initiate a marking cycle causing the requesting thread to hang. Reviewed-by: tonyp, ysr
author johnc
date Fri, 01 Oct 2010 18:23:16 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2001, 2007, 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 "incls/_precompiled.incl"
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26 # include "incls/_satbQueue.cpp.incl"
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27
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28 void ObjPtrQueue::apply_closure(ObjectClosure* cl) {
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29 if (_buf != NULL) {
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30 apply_closure_to_buffer(cl, _buf, _index, _sz);
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31 _index = _sz;
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32 }
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33 }
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34
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35 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl,
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36 void** buf, size_t index, size_t sz) {
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37 if (cl == NULL) return;
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38 for (size_t i = index; i < sz; i += oopSize) {
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39 oop obj = (oop)buf[byte_index_to_index((int)i)];
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40 // There can be NULL entries because of destructors.
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41 if (obj != NULL) {
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42 cl->do_object(obj);
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43 }
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44 }
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45 }
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46
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47 #ifdef ASSERT
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48 void ObjPtrQueue::verify_oops_in_buffer() {
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49 if (_buf == NULL) return;
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50 for (size_t i = _index; i < _sz; i += oopSize) {
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51 oop obj = (oop)_buf[byte_index_to_index((int)i)];
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52 assert(obj != NULL && obj->is_oop(true /* ignore mark word */),
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53 "Not an oop");
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54 }
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55 }
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56 #endif
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57
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58 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
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59 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
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60 #endif // _MSC_VER
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61
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62
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63 SATBMarkQueueSet::SATBMarkQueueSet() :
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64 PtrQueueSet(),
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65 _closure(NULL), _par_closures(NULL),
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66 _shared_satb_queue(this, true /*perm*/)
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67 {}
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68
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69 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
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70 int process_completed_threshold,
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71 Mutex* lock) {
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72 PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1);
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73 _shared_satb_queue.set_lock(lock);
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74 if (ParallelGCThreads > 0) {
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75 _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads);
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76 }
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77 }
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78
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79
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80 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {
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81 DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();)
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82 t->satb_mark_queue().handle_zero_index();
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83 }
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84
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85 #ifdef ASSERT
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86 void SATBMarkQueueSet::dump_active_values(JavaThread* first,
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87 bool expected_active) {
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88 gclog_or_tty->print_cr("SATB queue active values for Java Threads");
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89 gclog_or_tty->print_cr(" SATB queue set: active is %s",
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90 (is_active()) ? "TRUE" : "FALSE");
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91 gclog_or_tty->print_cr(" expected_active is %s",
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92 (expected_active) ? "TRUE" : "FALSE");
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93 for (JavaThread* t = first; t; t = t->next()) {
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94 bool active = t->satb_mark_queue().is_active();
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95 gclog_or_tty->print_cr(" thread %s, active is %s",
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96 t->name(), (active) ? "TRUE" : "FALSE");
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97 }
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98 }
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99 #endif // ASSERT
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100
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101 void SATBMarkQueueSet::set_active_all_threads(bool b,
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102 bool expected_active) {
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103 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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104 JavaThread* first = Threads::first();
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105
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106 #ifdef ASSERT
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107 if (_all_active != expected_active) {
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108 dump_active_values(first, expected_active);
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109
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110 // I leave this here as a guarantee, instead of an assert, so
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111 // that it will still be compiled in if we choose to uncomment
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112 // the #ifdef ASSERT in a product build. The whole block is
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113 // within an #ifdef ASSERT so the guarantee will not be compiled
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114 // in a product build anyway.
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115 guarantee(false,
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116 "SATB queue set has an unexpected active value");
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117 }
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118 #endif // ASSERT
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119 _all_active = b;
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120
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121 for (JavaThread* t = first; t; t = t->next()) {
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122 #ifdef ASSERT
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123 bool active = t->satb_mark_queue().is_active();
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124 if (active != expected_active) {
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125 dump_active_values(first, expected_active);
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126
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127 // I leave this here as a guarantee, instead of an assert, so
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128 // that it will still be compiled in if we choose to uncomment
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129 // the #ifdef ASSERT in a product build. The whole block is
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130 // within an #ifdef ASSERT so the guarantee will not be compiled
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131 // in a product build anyway.
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132 guarantee(false,
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133 "thread has an unexpected active value in its SATB queue");
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134 }
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135 #endif // ASSERT
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136 t->satb_mark_queue().set_active(b);
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137 }
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138 }
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139
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140 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) {
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141 _closure = closure;
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142 }
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143
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144 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) {
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145 assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition");
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146 _par_closures[i] = par_closure;
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147 }
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148
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149 void SATBMarkQueueSet::iterate_closure_all_threads() {
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150 for(JavaThread* t = Threads::first(); t; t = t->next()) {
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151 t->satb_mark_queue().apply_closure(_closure);
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152 }
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153 shared_satb_queue()->apply_closure(_closure);
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154 }
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155
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156 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) {
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157 SharedHeap* sh = SharedHeap::heap();
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158 int parity = sh->strong_roots_parity();
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159
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160 for(JavaThread* t = Threads::first(); t; t = t->next()) {
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161 if (t->claim_oops_do(true, parity)) {
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162 t->satb_mark_queue().apply_closure(_par_closures[worker]);
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163 }
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164 }
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165 // We'll have worker 0 do this one.
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166 if (worker == 0) {
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167 shared_satb_queue()->apply_closure(_par_closures[0]);
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168 }
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169 }
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170
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171 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par,
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172 int worker) {
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173 BufferNode* nd = NULL;
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174 {
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175 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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176 if (_completed_buffers_head != NULL) {
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177 nd = _completed_buffers_head;
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178 _completed_buffers_head = nd->next();
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179 if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL;
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180 _n_completed_buffers--;
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181 if (_n_completed_buffers == 0) _process_completed = false;
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182 }
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183 }
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184 ObjectClosure* cl = (par ? _par_closures[worker] : _closure);
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185 if (nd != NULL) {
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186 void **buf = BufferNode::make_buffer_from_node(nd);
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187 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz);
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188 deallocate_buffer(buf);
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189 return true;
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190 } else {
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191 return false;
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192 }
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193 }
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194
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195 void SATBMarkQueueSet::abandon_partial_marking() {
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196 BufferNode* buffers_to_delete = NULL;
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197 {
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198 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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199 while (_completed_buffers_head != NULL) {
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200 BufferNode* nd = _completed_buffers_head;
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201 _completed_buffers_head = nd->next();
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202 nd->set_next(buffers_to_delete);
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203 buffers_to_delete = nd;
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204 }
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205 _completed_buffers_tail = NULL;
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206 _n_completed_buffers = 0;
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207 DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked());
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208 }
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209 while (buffers_to_delete != NULL) {
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210 BufferNode* nd = buffers_to_delete;
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211 buffers_to_delete = nd->next();
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212 deallocate_buffer(BufferNode::make_buffer_from_node(nd));
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213 }
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214 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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215 // So we can safely manipulate these queues.
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216 for (JavaThread* t = Threads::first(); t; t = t->next()) {
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217 t->satb_mark_queue().reset();
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218 }
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219 shared_satb_queue()->reset();
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220 }