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annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp @ 20197:ce8f6bb717c9

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8042195: Introduce umbrella header orderAccess.inline.hpp. Reviewed-by: dholmes, kvn, stefank, twisti
author goetz
date Tue, 29 Apr 2014 15:17:27 +0200
parents 78bbf4d43a14
children d7e2d5f2846b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2001, 2014, 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_G1COLLECTEDHEAP_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_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.hpp"
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30 #include "gc_implementation/g1/g1AllocRegion.inline.hpp"
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31 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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32 #include "gc_implementation/g1/g1RemSet.inline.hpp"
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33 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
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34 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
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35 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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36 #include "runtime/orderAccess.inline.hpp"
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37 #include "utilities/taskqueue.hpp"
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38
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39 // Inline functions for G1CollectedHeap
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40
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41 // Return the region with the given index. It assumes the index is valid.
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42 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); }
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43
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44 template <class T>
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45 inline HeapRegion*
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46 G1CollectedHeap::heap_region_containing(const T addr) const {
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47 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr);
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48 // hr can be null if addr in perm_gen
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49 if (hr != NULL && hr->continuesHumongous()) {
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50 hr = hr->humongous_start_region();
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51 }
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52 return hr;
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53 }
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54
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55 template <class T>
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56 inline HeapRegion*
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57 G1CollectedHeap::heap_region_containing_raw(const T addr) const {
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58 assert(_g1_reserved.contains((const void*) addr), "invariant");
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59 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr);
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60 return res;
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61 }
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62
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63 inline void G1CollectedHeap::reset_gc_time_stamp() {
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64 _gc_time_stamp = 0;
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65 OrderAccess::fence();
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66 // Clear the cached CSet starting regions and time stamps.
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67 // Their validity is dependent on the GC timestamp.
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68 clear_cset_start_regions();
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69 }
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70
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71 inline void G1CollectedHeap::increment_gc_time_stamp() {
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72 ++_gc_time_stamp;
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73 OrderAccess::fence();
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74 }
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75
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76 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
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77 _old_set.remove(hr);
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78 }
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79
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80 inline bool G1CollectedHeap::obj_in_cs(oop obj) {
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81 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);
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82 return r != NULL && r->in_collection_set();
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83 }
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84
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85 inline HeapWord*
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86 G1CollectedHeap::attempt_allocation(size_t word_size,
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87 unsigned int* gc_count_before_ret,
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88 int* gclocker_retry_count_ret) {
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89 assert_heap_not_locked_and_not_at_safepoint();
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90 assert(!isHumongous(word_size), "attempt_allocation() should not "
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91 "be called for humongous allocation requests");
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92
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93 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size,
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94 false /* bot_updates */);
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95 if (result == NULL) {
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96 result = attempt_allocation_slow(word_size,
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97 gc_count_before_ret,
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98 gclocker_retry_count_ret);
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99 }
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100 assert_heap_not_locked();
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101 if (result != NULL) {
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102 dirty_young_block(result, word_size);
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103 }
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104 return result;
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105 }
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106
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107 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t
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108 word_size) {
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109 assert(!isHumongous(word_size),
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110 "we should not be seeing humongous-size allocations in this path");
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111
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112 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size,
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113 false /* bot_updates */);
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114 if (result == NULL) {
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115 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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116 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size,
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117 false /* bot_updates */);
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118 }
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119 if (result != NULL) {
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120 dirty_young_block(result, word_size);
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121 }
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122 return result;
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123 }
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124
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125 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) {
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126 assert(!isHumongous(word_size),
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127 "we should not be seeing humongous-size allocations in this path");
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128
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129 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size,
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130 true /* bot_updates */);
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131 if (result == NULL) {
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132 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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133 result = _old_gc_alloc_region.attempt_allocation_locked(word_size,
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134 true /* bot_updates */);
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135 }
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136 return result;
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137 }
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138
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139 // It dirties the cards that cover the block so that so that the post
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140 // write barrier never queues anything when updating objects on this
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141 // block. It is assumed (and in fact we assert) that the block
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142 // belongs to a young region.
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143 inline void
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144 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
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145 assert_heap_not_locked();
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146
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147 // Assign the containing region to containing_hr so that we don't
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148 // have to keep calling heap_region_containing_raw() in the
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149 // asserts below.
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150 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)
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151 assert(containing_hr != NULL && start != NULL && word_size > 0,
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152 "pre-condition");
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153 assert(containing_hr->is_in(start), "it should contain start");
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154 assert(containing_hr->is_young(), "it should be young");
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155 assert(!containing_hr->isHumongous(), "it should not be humongous");
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156
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157 HeapWord* end = start + word_size;
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158 assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
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159
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160 MemRegion mr(start, end);
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161 g1_barrier_set()->g1_mark_as_young(mr);
342
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162 }
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163
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164 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {
342
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165 return _task_queues->queue(i);
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166 }
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167
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168 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {
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169 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);
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170 }
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171
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172 inline bool G1CollectedHeap::isMarkedNext(oop obj) const {
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173 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);
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174 }
1972
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175
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176
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177 // This is a fast test on whether a reference points into the
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178 // collection set or not. Assume that the reference
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179 // points into the heap.
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180 inline bool G1CollectedHeap::in_cset_fast_test(oop obj) {
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181 assert(_in_cset_fast_test != NULL, "sanity");
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182 assert(_g1_committed.contains((HeapWord*) obj), err_msg("Given reference outside of heap, is "PTR_FORMAT, p2i((HeapWord*)obj)));
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183 // no need to subtract the bottom of the heap from obj,
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184 // _in_cset_fast_test is biased
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185 uintx index = cast_from_oop<uintx>(obj) >> HeapRegion::LogOfHRGrainBytes;
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186 bool ret = _in_cset_fast_test[index];
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187 // let's make sure the result is consistent with what the slower
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188 // test returns
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189 assert( ret || !obj_in_cs(obj), "sanity");
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190 assert(!ret || obj_in_cs(obj), "sanity");
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191 return ret;
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192 }
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193
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194 #ifndef PRODUCT
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195 // Support for G1EvacuationFailureALot
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196
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197 inline bool
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198 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,
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199 bool during_initial_mark,
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200 bool during_marking) {
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201 bool res = false;
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202 if (during_marking) {
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203 res |= G1EvacuationFailureALotDuringConcMark;
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204 }
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205 if (during_initial_mark) {
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206 res |= G1EvacuationFailureALotDuringInitialMark;
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207 }
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208 if (gcs_are_young) {
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209 res |= G1EvacuationFailureALotDuringYoungGC;
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210 } else {
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211 // GCs are mixed
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212 res |= G1EvacuationFailureALotDuringMixedGC;
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213 }
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214 return res;
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215 }
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216
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217 inline void
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218 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
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219 if (G1EvacuationFailureALot) {
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220 // Note we can't assert that _evacuation_failure_alot_for_current_gc
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221 // is clear here. It may have been set during a previous GC but that GC
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222 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
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223 // trigger an evacuation failure and clear the flags and and counts.
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224
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225 // Check if we have gone over the interval.
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226 const size_t gc_num = total_collections();
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227 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
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228
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229 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
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230
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231 // Now check if G1EvacuationFailureALot is enabled for the current GC type.
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232 const bool gcs_are_young = g1_policy()->gcs_are_young();
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233 const bool during_im = g1_policy()->during_initial_mark_pause();
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234 const bool during_marking = mark_in_progress();
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235
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236 _evacuation_failure_alot_for_current_gc &=
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237 evacuation_failure_alot_for_gc_type(gcs_are_young,
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238 during_im,
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239 during_marking);
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240 }
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241 }
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242
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243 inline bool
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244 G1CollectedHeap::evacuation_should_fail() {
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245 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
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246 return false;
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247 }
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248 // G1EvacuationFailureALot is in effect for current GC
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249 // Access to _evacuation_failure_alot_count is not atomic;
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250 // the value does not have to be exact.
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251 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
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252 return false;
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253 }
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254 _evacuation_failure_alot_count = 0;
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255 return true;
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256 }
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257
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258 inline void G1CollectedHeap::reset_evacuation_should_fail() {
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259 if (G1EvacuationFailureALot) {
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260 _evacuation_failure_alot_gc_number = total_collections();
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261 _evacuation_failure_alot_count = 0;
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262 _evacuation_failure_alot_for_current_gc = false;
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263 }
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264 }
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265 #endif // #ifndef PRODUCT
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266
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267 inline bool G1CollectedHeap::is_in_young(const oop obj) {
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268 HeapRegion* hr = heap_region_containing(obj);
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269 return hr != NULL && hr->is_young();
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270 }
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271
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272 // We don't need barriers for initializing stores to objects
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273 // in the young gen: for the SATB pre-barrier, there is no
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274 // pre-value that needs to be remembered; for the remembered-set
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275 // update logging post-barrier, we don't maintain remembered set
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276 // information for young gen objects.
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277 inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
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278 return is_in_young(new_obj);
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279 }
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280
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281 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
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282 const HeapRegion* hr = heap_region_containing(obj);
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283 if (hr == NULL) {
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284 if (obj == NULL) return false;
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285 else return true;
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286 }
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287 else return is_obj_dead(obj, hr);
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288 }
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289
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290 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
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291 const HeapRegion* hr = heap_region_containing(obj);
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292 if (hr == NULL) {
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293 if (obj == NULL) return false;
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294 else return true;
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295 }
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296 else return is_obj_ill(obj, hr);
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297 }
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298
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299 template <class T> inline void G1ParScanThreadState::immediate_rs_update(HeapRegion* from, T* p, int tid) {
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300 if (!from->is_survivor()) {
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301 _g1_rem->par_write_ref(from, p, tid);
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302 }
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303 }
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304
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305 template <class T> void G1ParScanThreadState::update_rs(HeapRegion* from, T* p, int tid) {
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306 if (G1DeferredRSUpdate) {
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307 deferred_rs_update(from, p, tid);
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308 } else {
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309 immediate_rs_update(from, p, tid);
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310 }
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311 }
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312
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313
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314 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) {
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315 assert(has_partial_array_mask(p), "invariant");
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316 oop from_obj = clear_partial_array_mask(p);
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317
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318 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap.");
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319 assert(from_obj->is_objArray(), "must be obj array");
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320 objArrayOop from_obj_array = objArrayOop(from_obj);
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321 // The from-space object contains the real length.
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322 int length = from_obj_array->length();
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323
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324 assert(from_obj->is_forwarded(), "must be forwarded");
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325 oop to_obj = from_obj->forwardee();
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326 assert(from_obj != to_obj, "should not be chunking self-forwarded objects");
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327 objArrayOop to_obj_array = objArrayOop(to_obj);
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328 // We keep track of the next start index in the length field of the
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329 // to-space object.
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330 int next_index = to_obj_array->length();
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331 assert(0 <= next_index && next_index < length,
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332 err_msg("invariant, next index: %d, length: %d", next_index, length));
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333
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334 int start = next_index;
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335 int end = length;
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336 int remainder = end - start;
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337 // We'll try not to push a range that's smaller than ParGCArrayScanChunk.
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338 if (remainder > 2 * ParGCArrayScanChunk) {
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339 end = start + ParGCArrayScanChunk;
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340 to_obj_array->set_length(end);
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341 // Push the remainder before we process the range in case another
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342 // worker has run out of things to do and can steal it.
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343 oop* from_obj_p = set_partial_array_mask(from_obj);
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344 push_on_queue(from_obj_p);
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345 } else {
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346 assert(length == end, "sanity");
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347 // We'll process the final range for this object. Restore the length
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348 // so that the heap remains parsable in case of evacuation failure.
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349 to_obj_array->set_length(end);
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350 }
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351 _scanner.set_region(_g1h->heap_region_containing_raw(to_obj));
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352 // Process indexes [start,end). It will also process the header
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353 // along with the first chunk (i.e., the chunk with start == 0).
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354 // Note that at this point the length field of to_obj_array is not
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355 // correct given that we are using it to keep track of the next
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356 // start index. oop_iterate_range() (thankfully!) ignores the length
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357 // field and only relies on the start / end parameters. It does
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358 // however return the size of the object which will be incorrect. So
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359 // we have to ignore it even if we wanted to use it.
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360 to_obj_array->oop_iterate_range(&_scanner, start, end);
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361 }
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362
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363 template <class T> inline void G1ParScanThreadState::deal_with_reference(T* ref_to_scan) {
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364 if (!has_partial_array_mask(ref_to_scan)) {
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365 // Note: we can use "raw" versions of "region_containing" because
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366 // "obj_to_scan" is definitely in the heap, and is not in a
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367 // humongous region.
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368 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan);
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369 do_oop_evac(ref_to_scan, r);
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370 } else {
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371 do_oop_partial_array((oop*)ref_to_scan);
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372 }
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373 }
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374
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375 inline void G1ParScanThreadState::deal_with_reference(StarTask ref) {
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376 assert(verify_task(ref), "sanity");
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377 if (ref.is_narrow()) {
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378 deal_with_reference((narrowOop*)ref);
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379 } else {
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380 deal_with_reference((oop*)ref);
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381 }
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382 }
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383
1972
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384 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP