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1 /* |
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2 * Copyright (c) 2001, 2011, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |
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27 |
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28 #include "gc_implementation/g1/concurrentMark.hpp" |
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29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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30 |
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31 inline void CMTask::push(oop obj) { |
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32 HeapWord* objAddr = (HeapWord*) obj; |
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33 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); |
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34 assert(!_g1h->is_on_master_free_list( |
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35 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); |
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36 assert(!_g1h->is_obj_ill(obj), "invariant"); |
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37 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); |
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38 |
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39 if (_cm->verbose_high()) { |
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40 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj); |
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41 } |
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42 |
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43 if (!_task_queue->push(obj)) { |
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44 // The local task queue looks full. We need to push some entries |
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45 // to the global stack. |
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46 |
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47 if (_cm->verbose_medium()) { |
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48 gclog_or_tty->print_cr("[%d] task queue overflow, " |
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49 "moving entries to the global stack", |
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50 _task_id); |
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51 } |
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52 move_entries_to_global_stack(); |
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53 |
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54 // this should succeed since, even if we overflow the global |
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55 // stack, we should have definitely removed some entries from the |
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56 // local queue. So, there must be space on it. |
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57 bool success = _task_queue->push(obj); |
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58 assert(success, "invariant"); |
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59 } |
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60 |
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61 statsOnly( int tmp_size = _task_queue->size(); |
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62 if (tmp_size > _local_max_size) |
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63 _local_max_size = tmp_size; |
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64 ++_local_pushes ); |
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65 } |
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66 |
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67 // This determines whether the method below will check both the local |
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68 // and global fingers when determining whether to push on the stack a |
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69 // gray object (value 1) or whether it will only check the global one |
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70 // (value 0). The tradeoffs are that the former will be a bit more |
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71 // accurate and possibly push less on the stack, but it might also be |
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72 // a little bit slower. |
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73 |
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74 #define _CHECK_BOTH_FINGERS_ 1 |
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75 |
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76 inline void CMTask::deal_with_reference(oop obj) { |
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77 if (_cm->verbose_high()) { |
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78 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT, |
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79 _task_id, (void*) obj); |
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80 } |
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81 |
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82 ++_refs_reached; |
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83 |
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84 HeapWord* objAddr = (HeapWord*) obj; |
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85 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
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86 if (_g1h->is_in_g1_reserved(objAddr)) { |
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87 assert(obj != NULL, "null check is implicit"); |
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88 if (!_nextMarkBitMap->isMarked(objAddr)) { |
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89 // Only get the containing region if the object is not marked on the |
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90 // bitmap (otherwise, it's a waste of time since we won't do |
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91 // anything with it). |
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92 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); |
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93 if (!hr->obj_allocated_since_next_marking(obj)) { |
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94 if (_cm->verbose_high()) { |
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95 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked", |
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96 _task_id, (void*) obj); |
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97 } |
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98 |
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99 // we need to mark it first |
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100 if (_nextMarkBitMap->parMark(objAddr)) { |
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101 // No OrderAccess:store_load() is needed. It is implicit in the |
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102 // CAS done in parMark(objAddr) above |
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103 HeapWord* global_finger = _cm->finger(); |
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104 |
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105 #if _CHECK_BOTH_FINGERS_ |
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106 // we will check both the local and global fingers |
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107 |
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108 if (_finger != NULL && objAddr < _finger) { |
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109 if (_cm->verbose_high()) { |
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110 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), " |
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111 "pushing it", _task_id, _finger); |
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112 } |
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113 push(obj); |
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114 } else if (_curr_region != NULL && objAddr < _region_limit) { |
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115 // do nothing |
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116 } else if (objAddr < global_finger) { |
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117 // Notice that the global finger might be moving forward |
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118 // concurrently. This is not a problem. In the worst case, we |
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119 // mark the object while it is above the global finger and, by |
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120 // the time we read the global finger, it has moved forward |
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121 // passed this object. In this case, the object will probably |
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122 // be visited when a task is scanning the region and will also |
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123 // be pushed on the stack. So, some duplicate work, but no |
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124 // correctness problems. |
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125 |
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126 if (_cm->verbose_high()) { |
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127 gclog_or_tty->print_cr("[%d] below the global finger " |
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128 "("PTR_FORMAT"), pushing it", |
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129 _task_id, global_finger); |
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130 } |
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131 push(obj); |
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132 } else { |
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133 // do nothing |
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134 } |
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135 #else // _CHECK_BOTH_FINGERS_ |
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136 // we will only check the global finger |
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137 |
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138 if (objAddr < global_finger) { |
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139 // see long comment above |
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140 |
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141 if (_cm->verbose_high()) { |
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142 gclog_or_tty->print_cr("[%d] below the global finger " |
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143 "("PTR_FORMAT"), pushing it", |
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144 _task_id, global_finger); |
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145 } |
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146 push(obj); |
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147 } |
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148 #endif // _CHECK_BOTH_FINGERS_ |
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149 } |
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150 } |
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151 } |
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152 } |
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153 } |
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154 |
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155 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |