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annotate src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 12343:d55c004e1d4d

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8025305: Cleanup CardTableModRefBS usage in G1 Summary: Move some G1 specific code from CardTableModRefBS to G1SATBCardTableModRefBS. Reviewed-by: brutisso, tschatzl, ehelin
author mgerdin
date Tue, 24 Sep 2013 14:46:29 +0200
parents 9def4075da6d
children 63a4eb8bcd23 78bbf4d43a14
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2001, 2013, 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 // Utility routine to set an exclusive range of cards on the given
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32 // card liveness bitmap
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33 inline void ConcurrentMark::set_card_bitmap_range(BitMap* card_bm,
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34 BitMap::idx_t start_idx,
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35 BitMap::idx_t end_idx,
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36 bool is_par) {
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37
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38 // Set the exclusive bit range [start_idx, end_idx).
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39 assert((end_idx - start_idx) > 0, "at least one card");
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40 assert(end_idx <= card_bm->size(), "sanity");
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41
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42 // Silently clip the end index
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43 end_idx = MIN2(end_idx, card_bm->size());
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44
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45 // For small ranges use a simple loop; otherwise use set_range or
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46 // use par_at_put_range (if parallel). The range is made up of the
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47 // cards that are spanned by an object/mem region so 8 cards will
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48 // allow up to object sizes up to 4K to be handled using the loop.
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49 if ((end_idx - start_idx) <= 8) {
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50 for (BitMap::idx_t i = start_idx; i < end_idx; i += 1) {
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51 if (is_par) {
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52 card_bm->par_set_bit(i);
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53 } else {
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54 card_bm->set_bit(i);
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55 }
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56 }
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57 } else {
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58 // Note BitMap::par_at_put_range() and BitMap::set_range() are exclusive.
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59 if (is_par) {
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60 card_bm->par_at_put_range(start_idx, end_idx, true);
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61 } else {
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62 card_bm->set_range(start_idx, end_idx);
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63 }
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64 }
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65 }
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66
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67 // Returns the index in the liveness accounting card bitmap
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68 // for the given address
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69 inline BitMap::idx_t ConcurrentMark::card_bitmap_index_for(HeapWord* addr) {
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70 // Below, the term "card num" means the result of shifting an address
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71 // by the card shift -- address 0 corresponds to card number 0. One
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72 // must subtract the card num of the bottom of the heap to obtain a
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73 // card table index.
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74 intptr_t card_num = intptr_t(uintptr_t(addr) >> CardTableModRefBS::card_shift);
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75 return card_num - heap_bottom_card_num();
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76 }
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77
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78 // Counts the given memory region in the given task/worker
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79 // counting data structures.
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80 inline void ConcurrentMark::count_region(MemRegion mr, HeapRegion* hr,
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81 size_t* marked_bytes_array,
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82 BitMap* task_card_bm) {
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83 G1CollectedHeap* g1h = _g1h;
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84 CardTableModRefBS* ct_bs = g1h->g1_barrier_set();
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85
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86 HeapWord* start = mr.start();
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87 HeapWord* end = mr.end();
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88 size_t region_size_bytes = mr.byte_size();
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89 uint index = hr->hrs_index();
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90
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91 assert(!hr->continuesHumongous(), "should not be HC region");
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92 assert(hr == g1h->heap_region_containing(start), "sanity");
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93 assert(hr == g1h->heap_region_containing(mr.last()), "sanity");
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94 assert(marked_bytes_array != NULL, "pre-condition");
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95 assert(task_card_bm != NULL, "pre-condition");
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96
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97 // Add to the task local marked bytes for this region.
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98 marked_bytes_array[index] += region_size_bytes;
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99
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100 BitMap::idx_t start_idx = card_bitmap_index_for(start);
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101 BitMap::idx_t end_idx = card_bitmap_index_for(end);
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102
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103 // Note: if we're looking at the last region in heap - end
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104 // could be actually just beyond the end of the heap; end_idx
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105 // will then correspond to a (non-existent) card that is also
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106 // just beyond the heap.
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107 if (g1h->is_in_g1_reserved(end) && !ct_bs->is_card_aligned(end)) {
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108 // end of region is not card aligned - incremement to cover
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109 // all the cards spanned by the region.
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110 end_idx += 1;
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111 }
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112 // The card bitmap is task/worker specific => no need to use
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113 // the 'par' BitMap routines.
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114 // Set bits in the exclusive bit range [start_idx, end_idx).
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115 set_card_bitmap_range(task_card_bm, start_idx, end_idx, false /* is_par */);
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116 }
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117
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118 // Counts the given memory region in the task/worker counting
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119 // data structures for the given worker id.
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120 inline void ConcurrentMark::count_region(MemRegion mr,
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121 HeapRegion* hr,
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122 uint worker_id) {
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123 size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id);
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124 BitMap* task_card_bm = count_card_bitmap_for(worker_id);
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125 count_region(mr, hr, marked_bytes_array, task_card_bm);
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126 }
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127
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128 // Counts the given memory region, which may be a single object, in the
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129 // task/worker counting data structures for the given worker id.
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130 inline void ConcurrentMark::count_region(MemRegion mr, uint worker_id) {
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131 HeapWord* addr = mr.start();
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132 HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
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133 count_region(mr, hr, worker_id);
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134 }
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135
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136 // Counts the given object in the given task/worker counting data structures.
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137 inline void ConcurrentMark::count_object(oop obj,
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138 HeapRegion* hr,
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139 size_t* marked_bytes_array,
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140 BitMap* task_card_bm) {
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141 MemRegion mr((HeapWord*)obj, obj->size());
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142 count_region(mr, hr, marked_bytes_array, task_card_bm);
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143 }
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144
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145 // Counts the given object in the task/worker counting data
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146 // structures for the given worker id.
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147 inline void ConcurrentMark::count_object(oop obj,
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148 HeapRegion* hr,
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149 uint worker_id) {
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150 size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id);
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151 BitMap* task_card_bm = count_card_bitmap_for(worker_id);
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152 HeapWord* addr = (HeapWord*) obj;
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153 count_object(obj, hr, marked_bytes_array, task_card_bm);
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154 }
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155
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156 // Attempts to mark the given object and, if successful, counts
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157 // the object in the given task/worker counting structures.
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158 inline bool ConcurrentMark::par_mark_and_count(oop obj,
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159 HeapRegion* hr,
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160 size_t* marked_bytes_array,
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161 BitMap* task_card_bm) {
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162 HeapWord* addr = (HeapWord*)obj;
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163 if (_nextMarkBitMap->parMark(addr)) {
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164 // Update the task specific count data for the object.
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165 count_object(obj, hr, marked_bytes_array, task_card_bm);
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166 return true;
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167 }
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168 return false;
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169 }
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170
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171 // Attempts to mark the given object and, if successful, counts
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172 // the object in the task/worker counting structures for the
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173 // given worker id.
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174 inline bool ConcurrentMark::par_mark_and_count(oop obj,
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175 size_t word_size,
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176 HeapRegion* hr,
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177 uint worker_id) {
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178 HeapWord* addr = (HeapWord*)obj;
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179 if (_nextMarkBitMap->parMark(addr)) {
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180 MemRegion mr(addr, word_size);
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181 count_region(mr, hr, worker_id);
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182 return true;
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183 }
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184 return false;
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185 }
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186
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187 // Attempts to mark the given object and, if successful, counts
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188 // the object in the task/worker counting structures for the
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189 // given worker id.
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190 inline bool ConcurrentMark::par_mark_and_count(oop obj,
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191 HeapRegion* hr,
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192 uint worker_id) {
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193 HeapWord* addr = (HeapWord*)obj;
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194 if (_nextMarkBitMap->parMark(addr)) {
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195 // Update the task specific count data for the object.
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196 count_object(obj, hr, worker_id);
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197 return true;
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198 }
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199 return false;
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200 }
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201
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202 // As above - but we don't know the heap region containing the
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203 // object and so have to supply it.
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204 inline bool ConcurrentMark::par_mark_and_count(oop obj, uint worker_id) {
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205 HeapWord* addr = (HeapWord*)obj;
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206 HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
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207 return par_mark_and_count(obj, hr, worker_id);
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208 }
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209
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210 // Similar to the above routine but we already know the size, in words, of
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211 // the object that we wish to mark/count
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212 inline bool ConcurrentMark::par_mark_and_count(oop obj,
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213 size_t word_size,
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214 uint worker_id) {
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215 HeapWord* addr = (HeapWord*)obj;
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216 if (_nextMarkBitMap->parMark(addr)) {
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217 // Update the task specific count data for the object.
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218 MemRegion mr(addr, word_size);
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219 count_region(mr, worker_id);
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220 return true;
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221 }
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222 return false;
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223 }
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224
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225 // Unconditionally mark the given object, and unconditinally count
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226 // the object in the counting structures for worker id 0.
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227 // Should *not* be called from parallel code.
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228 inline bool ConcurrentMark::mark_and_count(oop obj, HeapRegion* hr) {
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229 HeapWord* addr = (HeapWord*)obj;
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230 _nextMarkBitMap->mark(addr);
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231 // Update the task specific count data for the object.
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232 count_object(obj, hr, 0 /* worker_id */);
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233 return true;
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234 }
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235
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236 // As above - but we don't have the heap region containing the
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237 // object, so we have to supply it.
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238 inline bool ConcurrentMark::mark_and_count(oop obj) {
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239 HeapWord* addr = (HeapWord*)obj;
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240 HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
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241 return mark_and_count(obj, hr);
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242 }
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243
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244 inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) {
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245 HeapWord* start_addr = MAX2(startWord(), mr.start());
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246 HeapWord* end_addr = MIN2(endWord(), mr.end());
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247
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248 if (end_addr > start_addr) {
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249 // Right-open interval [start-offset, end-offset).
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250 BitMap::idx_t start_offset = heapWordToOffset(start_addr);
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251 BitMap::idx_t end_offset = heapWordToOffset(end_addr);
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252
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253 start_offset = _bm.get_next_one_offset(start_offset, end_offset);
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254 while (start_offset < end_offset) {
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255 if (!cl->do_bit(start_offset)) {
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256 return false;
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257 }
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258 HeapWord* next_addr = MIN2(nextObject(offsetToHeapWord(start_offset)), end_addr);
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259 BitMap::idx_t next_offset = heapWordToOffset(next_addr);
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260 start_offset = _bm.get_next_one_offset(next_offset, end_offset);
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261 }
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262 }
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263 return true;
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264 }
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265
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266 inline bool CMBitMapRO::iterate(BitMapClosure* cl) {
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267 MemRegion mr(startWord(), sizeInWords());
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268 return iterate(cl, mr);
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269 }
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270
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271 inline void CMTask::push(oop obj) {
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272 HeapWord* objAddr = (HeapWord*) obj;
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273 assert(_g1h->is_in_g1_reserved(objAddr), "invariant");
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274 assert(!_g1h->is_on_master_free_list(
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275 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant");
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276 assert(!_g1h->is_obj_ill(obj), "invariant");
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277 assert(_nextMarkBitMap->isMarked(objAddr), "invariant");
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278
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279 if (_cm->verbose_high()) {
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280 gclog_or_tty->print_cr("[%u] pushing "PTR_FORMAT, _worker_id, (void*) obj);
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281 }
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282
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283 if (!_task_queue->push(obj)) {
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284 // The local task queue looks full. We need to push some entries
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285 // to the global stack.
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286
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287 if (_cm->verbose_medium()) {
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288 gclog_or_tty->print_cr("[%u] task queue overflow, "
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289 "moving entries to the global stack",
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290 _worker_id);
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291 }
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292 move_entries_to_global_stack();
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293
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294 // this should succeed since, even if we overflow the global
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295 // stack, we should have definitely removed some entries from the
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296 // local queue. So, there must be space on it.
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297 bool success = _task_queue->push(obj);
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298 assert(success, "invariant");
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299 }
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300
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301 statsOnly( int tmp_size = _task_queue->size();
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302 if (tmp_size > _local_max_size) {
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303 _local_max_size = tmp_size;
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304 }
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305 ++_local_pushes );
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306 }
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307
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308 // This determines whether the method below will check both the local
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309 // and global fingers when determining whether to push on the stack a
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310 // gray object (value 1) or whether it will only check the global one
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311 // (value 0). The tradeoffs are that the former will be a bit more
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312 // accurate and possibly push less on the stack, but it might also be
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313 // a little bit slower.
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314
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315 #define _CHECK_BOTH_FINGERS_ 1
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316
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317 inline void CMTask::deal_with_reference(oop obj) {
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318 if (_cm->verbose_high()) {
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319 gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT,
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320 _worker_id, (void*) obj);
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321 }
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322
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323 ++_refs_reached;
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324
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325 HeapWord* objAddr = (HeapWord*) obj;
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326 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error");
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327 if (_g1h->is_in_g1_reserved(objAddr)) {
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328 assert(obj != NULL, "null check is implicit");
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329 if (!_nextMarkBitMap->isMarked(objAddr)) {
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330 // Only get the containing region if the object is not marked on the
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331 // bitmap (otherwise, it's a waste of time since we won't do
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332 // anything with it).
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333 HeapRegion* hr = _g1h->heap_region_containing_raw(obj);
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334 if (!hr->obj_allocated_since_next_marking(obj)) {
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335 if (_cm->verbose_high()) {
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336 gclog_or_tty->print_cr("[%u] "PTR_FORMAT" is not considered marked",
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337 _worker_id, (void*) obj);
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338 }
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339
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340 // we need to mark it first
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341 if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) {
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342 // No OrderAccess:store_load() is needed. It is implicit in the
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343 // CAS done in CMBitMap::parMark() call in the routine above.
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344 HeapWord* global_finger = _cm->finger();
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345
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346 #if _CHECK_BOTH_FINGERS_
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347 // we will check both the local and global fingers
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348
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349 if (_finger != NULL && objAddr < _finger) {
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350 if (_cm->verbose_high()) {
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351 gclog_or_tty->print_cr("[%u] below the local finger ("PTR_FORMAT"), "
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352 "pushing it", _worker_id, _finger);
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353 }
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354 push(obj);
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355 } else if (_curr_region != NULL && objAddr < _region_limit) {
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356 // do nothing
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357 } else if (objAddr < global_finger) {
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358 // Notice that the global finger might be moving forward
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359 // concurrently. This is not a problem. In the worst case, we
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360 // mark the object while it is above the global finger and, by
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361 // the time we read the global finger, it has moved forward
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362 // passed this object. In this case, the object will probably
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363 // be visited when a task is scanning the region and will also
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364 // be pushed on the stack. So, some duplicate work, but no
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365 // correctness problems.
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366
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367 if (_cm->verbose_high()) {
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368 gclog_or_tty->print_cr("[%u] below the global finger "
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369 "("PTR_FORMAT"), pushing it",
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370 _worker_id, global_finger);
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371 }
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372 push(obj);
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373 } else {
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374 // do nothing
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375 }
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376 #else // _CHECK_BOTH_FINGERS_
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377 // we will only check the global finger
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378
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379 if (objAddr < global_finger) {
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380 // see long comment above
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381
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382 if (_cm->verbose_high()) {
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383 gclog_or_tty->print_cr("[%u] below the global finger "
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384 "("PTR_FORMAT"), pushing it",
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385 _worker_id, global_finger);
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386 }
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387 push(obj);
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388 }
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389 #endif // _CHECK_BOTH_FINGERS_
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390 }
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391 }
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392 }
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393 }
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394 }
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395
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396 inline void ConcurrentMark::markPrev(oop p) {
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397 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity");
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398 // Note we are overriding the read-only view of the prev map here, via
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399 // the cast.
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400 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p);
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401 }
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402
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403 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size,
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404 uint worker_id, HeapRegion* hr) {
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405 assert(obj != NULL, "pre-condition");
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406 HeapWord* addr = (HeapWord*) obj;
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407 if (hr == NULL) {
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408 hr = _g1h->heap_region_containing_raw(addr);
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409 } else {
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410 assert(hr->is_in(addr), "pre-condition");
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411 }
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412 assert(hr != NULL, "sanity");
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413 // Given that we're looking for a region that contains an object
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414 // header it's impossible to get back a HC region.
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415 assert(!hr->continuesHumongous(), "sanity");
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416
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417 // We cannot assert that word_size == obj->size() given that obj
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418 // might not be in a consistent state (another thread might be in
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419 // the process of copying it). So the best thing we can do is to
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420 // assert that word_size is under an upper bound which is its
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421 // containing region's capacity.
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422 assert(word_size * HeapWordSize <= hr->capacity(),
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423 err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT,
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424 word_size * HeapWordSize, hr->capacity(),
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425 HR_FORMAT_PARAMS(hr)));
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426
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427 if (addr < hr->next_top_at_mark_start()) {
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428 if (!_nextMarkBitMap->isMarked(addr)) {
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429 par_mark_and_count(obj, word_size, hr, worker_id);
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430 }
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431 }
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432 }
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433
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434 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP