Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
parents | dd9cc155639c |
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rev | line source |
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3771 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
3771 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
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; |
12343 | 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->hrm_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 object in the given task/worker counting data structures. |
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129 inline void ConcurrentMark::count_object(oop obj, |
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130 HeapRegion* hr, |
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131 size_t* marked_bytes_array, |
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132 BitMap* task_card_bm) { |
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133 MemRegion mr((HeapWord*)obj, obj->size()); |
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134 count_region(mr, hr, marked_bytes_array, task_card_bm); |
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135 } |
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136 |
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137 // Attempts to mark the given object and, if successful, counts |
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138 // the object in the given task/worker counting structures. |
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139 inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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140 HeapRegion* hr, |
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141 size_t* marked_bytes_array, |
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142 BitMap* task_card_bm) { |
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143 HeapWord* addr = (HeapWord*)obj; |
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144 if (_nextMarkBitMap->parMark(addr)) { |
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145 // Update the task specific count data for the object. |
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146 count_object(obj, hr, marked_bytes_array, task_card_bm); |
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147 return true; |
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148 } |
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149 return false; |
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150 } |
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151 |
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152 // Attempts to mark the given object and, if successful, counts |
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153 // the object in the task/worker counting structures for the |
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154 // given worker id. |
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155 inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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156 size_t word_size, |
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157 HeapRegion* hr, |
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158 uint worker_id) { |
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159 HeapWord* addr = (HeapWord*)obj; |
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160 if (_nextMarkBitMap->parMark(addr)) { |
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161 MemRegion mr(addr, word_size); |
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162 count_region(mr, hr, worker_id); |
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163 return true; |
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164 } |
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165 return false; |
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166 } |
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167 |
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168 inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { |
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169 HeapWord* start_addr = MAX2(startWord(), mr.start()); |
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170 HeapWord* end_addr = MIN2(endWord(), mr.end()); |
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171 |
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172 if (end_addr > start_addr) { |
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173 // Right-open interval [start-offset, end-offset). |
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174 BitMap::idx_t start_offset = heapWordToOffset(start_addr); |
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175 BitMap::idx_t end_offset = heapWordToOffset(end_addr); |
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176 |
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177 start_offset = _bm.get_next_one_offset(start_offset, end_offset); |
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178 while (start_offset < end_offset) { |
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179 if (!cl->do_bit(start_offset)) { |
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180 return false; |
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181 } |
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182 HeapWord* next_addr = MIN2(nextObject(offsetToHeapWord(start_offset)), end_addr); |
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183 BitMap::idx_t next_offset = heapWordToOffset(next_addr); |
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184 start_offset = _bm.get_next_one_offset(next_offset, end_offset); |
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185 } |
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186 } |
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187 return true; |
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188 } |
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189 |
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190 inline bool CMBitMapRO::iterate(BitMapClosure* cl) { |
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191 MemRegion mr(startWord(), sizeInWords()); |
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192 return iterate(cl, mr); |
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193 } |
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194 |
20337 | 195 #define check_mark(addr) \ |
196 assert(_bmStartWord <= (addr) && (addr) < (_bmStartWord + _bmWordSize), \ | |
197 "outside underlying space?"); \ | |
198 assert(G1CollectedHeap::heap()->is_in_exact(addr), \ | |
199 err_msg("Trying to access not available bitmap "PTR_FORMAT \ | |
200 " corresponding to "PTR_FORMAT" (%u)", \ | |
201 p2i(this), p2i(addr), G1CollectedHeap::heap()->addr_to_region(addr))); | |
202 | |
203 inline void CMBitMap::mark(HeapWord* addr) { | |
204 check_mark(addr); | |
205 _bm.set_bit(heapWordToOffset(addr)); | |
206 } | |
207 | |
208 inline void CMBitMap::clear(HeapWord* addr) { | |
209 check_mark(addr); | |
210 _bm.clear_bit(heapWordToOffset(addr)); | |
211 } | |
212 | |
213 inline bool CMBitMap::parMark(HeapWord* addr) { | |
214 check_mark(addr); | |
215 return _bm.par_set_bit(heapWordToOffset(addr)); | |
216 } | |
217 | |
218 inline bool CMBitMap::parClear(HeapWord* addr) { | |
219 check_mark(addr); | |
220 return _bm.par_clear_bit(heapWordToOffset(addr)); | |
221 } | |
222 | |
223 #undef check_mark | |
224 | |
3771 | 225 inline void CMTask::push(oop obj) { |
226 HeapWord* objAddr = (HeapWord*) obj; | |
227 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); | |
228 assert(!_g1h->is_on_master_free_list( | |
229 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); | |
230 assert(!_g1h->is_obj_ill(obj), "invariant"); | |
231 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); | |
232 | |
233 if (_cm->verbose_high()) { | |
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234 gclog_or_tty->print_cr("[%u] pushing " PTR_FORMAT, _worker_id, p2i((void*) obj)); |
3771 | 235 } |
236 | |
237 if (!_task_queue->push(obj)) { | |
238 // The local task queue looks full. We need to push some entries | |
239 // to the global stack. | |
240 | |
241 if (_cm->verbose_medium()) { | |
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242 gclog_or_tty->print_cr("[%u] task queue overflow, " |
3771 | 243 "moving entries to the global stack", |
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244 _worker_id); |
3771 | 245 } |
246 move_entries_to_global_stack(); | |
247 | |
248 // this should succeed since, even if we overflow the global | |
249 // stack, we should have definitely removed some entries from the | |
250 // local queue. So, there must be space on it. | |
251 bool success = _task_queue->push(obj); | |
252 assert(success, "invariant"); | |
253 } | |
254 | |
255 statsOnly( int tmp_size = _task_queue->size(); | |
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256 if (tmp_size > _local_max_size) { |
3771 | 257 _local_max_size = tmp_size; |
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258 } |
3771 | 259 ++_local_pushes ); |
260 } | |
261 | |
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262 inline bool CMTask::is_below_finger(oop obj, HeapWord* global_finger) const { |
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263 // If obj is above the global finger, then the mark bitmap scan |
23025 | 264 // will find it later, and no push is needed. Similarly, if we have |
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265 // a current region and obj is between the local finger and the |
23025 | 266 // end of the current region, then no push is needed. The tradeoff |
267 // of checking both vs only checking the global finger is that the | |
268 // local check will be more accurate and so result in fewer pushes, | |
269 // but may also be a little slower. | |
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270 HeapWord* objAddr = (HeapWord*)obj; |
23025 | 271 if (_finger != NULL) { |
272 // We have a current region. | |
3771 | 273 |
23025 | 274 // Finger and region values are all NULL or all non-NULL. We |
275 // use _finger to check since we immediately use its value. | |
276 assert(_curr_region != NULL, "invariant"); | |
277 assert(_region_limit != NULL, "invariant"); | |
278 assert(_region_limit <= global_finger, "invariant"); | |
279 | |
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280 // True if obj is less than the local finger, or is between |
23025 | 281 // the region limit and the global finger. |
282 if (objAddr < _finger) { | |
283 return true; | |
284 } else if (objAddr < _region_limit) { | |
285 return false; | |
286 } // Else check global finger. | |
287 } | |
288 // Check global finger. | |
289 return objAddr < global_finger; | |
290 } | |
3771 | 291 |
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292 inline void CMTask::make_reference_grey(oop obj, HeapRegion* hr) { |
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293 if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) { |
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294 |
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295 if (_cm->verbose_high()) { |
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296 gclog_or_tty->print_cr("[%u] marked object " PTR_FORMAT, |
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297 _worker_id, p2i(obj)); |
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298 } |
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299 |
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300 // No OrderAccess:store_load() is needed. It is implicit in the |
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301 // CAS done in CMBitMap::parMark() call in the routine above. |
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302 HeapWord* global_finger = _cm->finger(); |
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303 |
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304 // We only need to push a newly grey object on the mark |
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305 // stack if it is in a section of memory the mark bitmap |
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306 // scan has already examined. Mark bitmap scanning |
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307 // maintains progress "fingers" for determining that. |
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308 // |
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309 // Notice that the global finger might be moving forward |
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310 // concurrently. This is not a problem. In the worst case, we |
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311 // mark the object while it is above the global finger and, by |
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312 // the time we read the global finger, it has moved forward |
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313 // past this object. In this case, the object will probably |
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314 // be visited when a task is scanning the region and will also |
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315 // be pushed on the stack. So, some duplicate work, but no |
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316 // correctness problems. |
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317 if (is_below_finger(obj, global_finger)) { |
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318 if (obj->is_typeArray()) { |
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319 // Immediately process arrays of primitive types, rather |
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320 // than pushing on the mark stack. This keeps us from |
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321 // adding humongous objects to the mark stack that might |
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322 // be reclaimed before the entry is processed - see |
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323 // selection of candidates for eager reclaim of humongous |
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324 // objects. The cost of the additional type test is |
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325 // mitigated by avoiding a trip through the mark stack, |
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326 // by only doing a bookkeeping update and avoiding the |
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327 // actual scan of the object - a typeArray contains no |
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328 // references, and the metadata is built-in. |
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329 process_grey_object<false>(obj); |
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330 } else { |
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331 if (_cm->verbose_high()) { |
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332 gclog_or_tty->print_cr("[%u] below a finger (local: " PTR_FORMAT |
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333 ", global: " PTR_FORMAT ") pushing " |
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334 PTR_FORMAT " on mark stack", |
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335 _worker_id, p2i(_finger), |
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336 p2i(global_finger), p2i(obj)); |
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337 } |
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338 push(obj); |
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339 } |
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340 } |
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341 } |
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342 } |
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343 |
3771 | 344 inline void CMTask::deal_with_reference(oop obj) { |
345 if (_cm->verbose_high()) { | |
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346 gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT, |
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347 _worker_id, p2i((void*) obj)); |
3771 | 348 } |
349 | |
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350 increment_refs_reached(); |
3771 | 351 |
352 HeapWord* objAddr = (HeapWord*) obj; | |
353 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); | |
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354 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 355 assert(obj != NULL, "null check is implicit"); |
356 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
357 // Only get the containing region if the object is not marked on the | |
358 // bitmap (otherwise, it's a waste of time since we won't do | |
359 // anything with it). | |
360 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
361 if (!hr->obj_allocated_since_next_marking(obj)) { | |
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362 make_reference_grey(obj, hr); |
3771 | 363 } |
364 } | |
365 } | |
366 } | |
367 | |
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368 inline void ConcurrentMark::markPrev(oop p) { |
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369 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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370 // Note we are overriding the read-only view of the prev map here, via |
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371 // the cast. |
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372 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p); |
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373 } |
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374 |
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375 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size, |
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376 uint worker_id, HeapRegion* hr) { |
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377 assert(obj != NULL, "pre-condition"); |
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378 HeapWord* addr = (HeapWord*) obj; |
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379 if (hr == NULL) { |
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380 hr = _g1h->heap_region_containing_raw(addr); |
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381 } else { |
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382 assert(hr->is_in(addr), "pre-condition"); |
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383 } |
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384 assert(hr != NULL, "sanity"); |
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385 // Given that we're looking for a region that contains an object |
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386 // header it's impossible to get back a HC region. |
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387 assert(!hr->continuesHumongous(), "sanity"); |
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388 |
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389 // We cannot assert that word_size == obj->size() given that obj |
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390 // might not be in a consistent state (another thread might be in |
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391 // the process of copying it). So the best thing we can do is to |
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392 // assert that word_size is under an upper bound which is its |
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393 // containing region's capacity. |
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394 assert(word_size * HeapWordSize <= hr->capacity(), |
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395 err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT, |
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396 word_size * HeapWordSize, hr->capacity(), |
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397 HR_FORMAT_PARAMS(hr))); |
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398 |
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399 if (addr < hr->next_top_at_mark_start()) { |
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400 if (!_nextMarkBitMap->isMarked(addr)) { |
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401 par_mark_and_count(obj, word_size, hr, worker_id); |
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402 } |
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403 } |
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404 } |
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405 |
3771 | 406 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |