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annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp @ 20296:a3953c777565

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8027959: Early reclamation of large objects in G1 Summary: Try to reclaim humongous objects at every young collection after doing a conservative estimate of its liveness. Reviewed-by: brutisso, mgerdin
author tschatzl
date Wed, 23 Jul 2014 09:03:32 +0200
parents b0c374311c4e
children eec72fa4b108
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/g1SATBCardTableModRefBS.hpp"
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33 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
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34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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35 #include "runtime/orderAccess.inline.hpp"
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36 #include "utilities/taskqueue.hpp"
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37
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38 // Inline functions for G1CollectedHeap
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39
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40 // Return the region with the given index. It assumes the index is valid.
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41 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); }
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42
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43 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
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44 assert(is_in_reserved(addr),
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45 err_msg("Cannot calculate region index for address "PTR_FORMAT" that is outside of the heap ["PTR_FORMAT", "PTR_FORMAT")",
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46 p2i(addr), p2i(_reserved.start()), p2i(_reserved.end())));
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47 return (uint)(pointer_delta(addr, _reserved.start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);
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48 }
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49
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50 template <class T>
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51 inline HeapRegion*
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52 G1CollectedHeap::heap_region_containing(const T addr) const {
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53 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr);
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54 // hr can be null if addr in perm_gen
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55 if (hr != NULL && hr->continuesHumongous()) {
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56 hr = hr->humongous_start_region();
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57 }
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58 return hr;
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59 }
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60
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61 template <class T>
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62 inline HeapRegion*
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63 G1CollectedHeap::heap_region_containing_raw(const T addr) const {
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64 assert(_g1_reserved.contains((const void*) addr), "invariant");
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65 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr);
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66 return res;
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67 }
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68
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69 inline void G1CollectedHeap::reset_gc_time_stamp() {
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70 _gc_time_stamp = 0;
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71 OrderAccess::fence();
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72 // Clear the cached CSet starting regions and time stamps.
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73 // Their validity is dependent on the GC timestamp.
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74 clear_cset_start_regions();
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75 }
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76
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77 inline void G1CollectedHeap::increment_gc_time_stamp() {
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78 ++_gc_time_stamp;
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79 OrderAccess::fence();
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80 }
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81
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82 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
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83 _old_set.remove(hr);
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84 }
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85
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86 inline bool G1CollectedHeap::obj_in_cs(oop obj) {
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87 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);
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88 return r != NULL && r->in_collection_set();
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89 }
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90
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91 inline HeapWord*
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92 G1CollectedHeap::attempt_allocation(size_t word_size,
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93 unsigned int* gc_count_before_ret,
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94 int* gclocker_retry_count_ret) {
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95 assert_heap_not_locked_and_not_at_safepoint();
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96 assert(!isHumongous(word_size), "attempt_allocation() should not "
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97 "be called for humongous allocation requests");
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98
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99 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size,
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100 false /* bot_updates */);
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101 if (result == NULL) {
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102 result = attempt_allocation_slow(word_size,
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103 gc_count_before_ret,
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104 gclocker_retry_count_ret);
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105 }
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106 assert_heap_not_locked();
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107 if (result != NULL) {
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108 dirty_young_block(result, word_size);
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109 }
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110 return result;
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111 }
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112
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113 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t
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114 word_size) {
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115 assert(!isHumongous(word_size),
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116 "we should not be seeing humongous-size allocations in this path");
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117
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118 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size,
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119 false /* bot_updates */);
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120 if (result == NULL) {
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121 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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122 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size,
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123 false /* bot_updates */);
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124 }
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125 if (result != NULL) {
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126 dirty_young_block(result, word_size);
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127 }
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128 return result;
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129 }
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130
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131 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) {
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132 assert(!isHumongous(word_size),
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133 "we should not be seeing humongous-size allocations in this path");
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134
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135 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size,
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136 true /* bot_updates */);
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137 if (result == NULL) {
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138 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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139 result = _old_gc_alloc_region.attempt_allocation_locked(word_size,
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140 true /* bot_updates */);
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141 }
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142 return result;
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143 }
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144
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145 // It dirties the cards that cover the block so that so that the post
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146 // write barrier never queues anything when updating objects on this
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147 // block. It is assumed (and in fact we assert) that the block
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148 // belongs to a young region.
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149 inline void
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150 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
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151 assert_heap_not_locked();
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152
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153 // Assign the containing region to containing_hr so that we don't
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154 // have to keep calling heap_region_containing_raw() in the
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155 // asserts below.
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156 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)
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157 assert(containing_hr != NULL && start != NULL && word_size > 0,
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158 "pre-condition");
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159 assert(containing_hr->is_in(start), "it should contain start");
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160 assert(containing_hr->is_young(), "it should be young");
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161 assert(!containing_hr->isHumongous(), "it should not be humongous");
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162
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163 HeapWord* end = start + word_size;
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164 assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
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165
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166 MemRegion mr(start, end);
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167 g1_barrier_set()->g1_mark_as_young(mr);
342
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168 }
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169
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170 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {
342
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171 return _task_queues->queue(i);
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172 }
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173
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174 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {
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175 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);
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176 }
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177
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178 inline bool G1CollectedHeap::isMarkedNext(oop obj) const {
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179 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);
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180 }
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181
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182 // This is a fast test on whether a reference points into the
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183 // collection set or not. Assume that the reference
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184 // points into the heap.
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185 inline bool G1CollectedHeap::is_in_cset(oop obj) {
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186 bool ret = _in_cset_fast_test.is_in_cset((HeapWord*)obj);
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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 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {
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195 return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj);
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196 }
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197
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198 G1CollectedHeap::in_cset_state_t G1CollectedHeap::in_cset_state(const oop obj) {
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199 return _in_cset_fast_test.at((HeapWord*)obj);
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200 }
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201
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202 void G1CollectedHeap::register_humongous_region_with_in_cset_fast_test(uint index) {
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203 _in_cset_fast_test.set_humongous(index);
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204 }
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205
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206 #ifndef PRODUCT
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207 // Support for G1EvacuationFailureALot
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208
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209 inline bool
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210 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,
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211 bool during_initial_mark,
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212 bool during_marking) {
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213 bool res = false;
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214 if (during_marking) {
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215 res |= G1EvacuationFailureALotDuringConcMark;
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216 }
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217 if (during_initial_mark) {
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218 res |= G1EvacuationFailureALotDuringInitialMark;
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219 }
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220 if (gcs_are_young) {
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221 res |= G1EvacuationFailureALotDuringYoungGC;
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222 } else {
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223 // GCs are mixed
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224 res |= G1EvacuationFailureALotDuringMixedGC;
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225 }
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226 return res;
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227 }
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228
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229 inline void
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230 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
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231 if (G1EvacuationFailureALot) {
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232 // Note we can't assert that _evacuation_failure_alot_for_current_gc
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233 // is clear here. It may have been set during a previous GC but that GC
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234 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
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235 // trigger an evacuation failure and clear the flags and and counts.
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236
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237 // Check if we have gone over the interval.
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238 const size_t gc_num = total_collections();
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239 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
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240
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241 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
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242
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243 // Now check if G1EvacuationFailureALot is enabled for the current GC type.
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244 const bool gcs_are_young = g1_policy()->gcs_are_young();
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245 const bool during_im = g1_policy()->during_initial_mark_pause();
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246 const bool during_marking = mark_in_progress();
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247
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248 _evacuation_failure_alot_for_current_gc &=
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249 evacuation_failure_alot_for_gc_type(gcs_are_young,
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250 during_im,
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251 during_marking);
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252 }
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253 }
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254
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255 inline bool
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256 G1CollectedHeap::evacuation_should_fail() {
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257 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
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258 return false;
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259 }
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260 // G1EvacuationFailureALot is in effect for current GC
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261 // Access to _evacuation_failure_alot_count is not atomic;
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262 // the value does not have to be exact.
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263 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
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264 return false;
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265 }
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266 _evacuation_failure_alot_count = 0;
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267 return true;
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268 }
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269
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270 inline void G1CollectedHeap::reset_evacuation_should_fail() {
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271 if (G1EvacuationFailureALot) {
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272 _evacuation_failure_alot_gc_number = total_collections();
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273 _evacuation_failure_alot_count = 0;
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274 _evacuation_failure_alot_for_current_gc = false;
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275 }
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276 }
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277 #endif // #ifndef PRODUCT
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278
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279 inline bool G1CollectedHeap::is_in_young(const oop obj) {
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280 HeapRegion* hr = heap_region_containing(obj);
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281 return hr != NULL && hr->is_young();
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282 }
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283
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284 // We don't need barriers for initializing stores to objects
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285 // in the young gen: for the SATB pre-barrier, there is no
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286 // pre-value that needs to be remembered; for the remembered-set
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287 // update logging post-barrier, we don't maintain remembered set
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288 // information for young gen objects.
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289 inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
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290 return is_in_young(new_obj);
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291 }
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292
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293 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
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294 const HeapRegion* hr = heap_region_containing(obj);
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295 if (hr == NULL) {
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296 if (obj == NULL) return false;
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297 else return true;
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298 }
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299 else return is_obj_dead(obj, hr);
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300 }
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301
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302 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
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303 const HeapRegion* hr = heap_region_containing(obj);
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304 if (hr == NULL) {
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305 if (obj == NULL) return false;
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306 else return true;
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307 }
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308 else return is_obj_ill(obj, hr);
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309 }
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310
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311 inline void G1CollectedHeap::set_humongous_is_live(oop obj) {
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312 uint region = addr_to_region((HeapWord*)obj);
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313 // We not only set the "live" flag in the humongous_is_live table, but also
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314 // reset the entry in the _in_cset_fast_test table so that subsequent references
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315 // to the same humongous object do not go into the slow path again.
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316 // This is racy, as multiple threads may at the same time enter here, but this
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317 // is benign.
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318 // During collection we only ever set the "live" flag, and only ever clear the
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319 // entry in the in_cset_fast_table.
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320 // We only ever evaluate the contents of these tables (in the VM thread) after
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321 // having synchronized the worker threads with the VM thread, or in the same
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322 // thread (i.e. within the VM thread).
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323 if (!_humongous_is_live.is_live(region)) {
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324 _humongous_is_live.set_live(region);
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325 _in_cset_fast_test.clear_humongous(region);
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326 }
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327 }
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328
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329 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP