Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 4836:d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
Summary: Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Thu, 12 Jan 2012 00:06:47 -0800 |
parents | 2e966d967c5c |
children | eff609af17d7 |
rev | line source |
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3771 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 // Returns the index in the liveness accounting card bitmap |
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32 // for the given address |
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33 inline BitMap::idx_t ConcurrentMark::card_bitmap_index_for(HeapWord* addr) { |
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34 // Below, the term "card num" means the result of shifting an address |
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35 // by the card shift -- address 0 corresponds to card number 0. One |
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36 // must subtract the card num of the bottom of the heap to obtain a |
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37 // card table index. |
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38 |
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39 intptr_t card_num = intptr_t(uintptr_t(addr) >> CardTableModRefBS::card_shift); |
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40 return card_num - heap_bottom_card_num(); |
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41 } |
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42 |
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43 // Counts the given memory region in the given task/worker |
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44 // counting data structures. |
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45 inline void ConcurrentMark::count_region(MemRegion mr, HeapRegion* hr, |
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46 size_t* marked_bytes_array, |
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47 BitMap* task_card_bm) { |
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48 G1CollectedHeap* g1h = _g1h; |
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49 HeapWord* start = mr.start(); |
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50 HeapWord* last = mr.last(); |
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51 size_t region_size_bytes = mr.byte_size(); |
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52 size_t index = hr->hrs_index(); |
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53 |
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54 assert(!hr->continuesHumongous(), "should not be HC region"); |
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55 assert(hr == g1h->heap_region_containing(start), "sanity"); |
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56 assert(hr == g1h->heap_region_containing(mr.last()), "sanity"); |
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57 assert(marked_bytes_array != NULL, "pre-condition"); |
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58 assert(task_card_bm != NULL, "pre-condition"); |
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59 |
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60 // Add to the task local marked bytes for this region. |
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61 marked_bytes_array[index] += region_size_bytes; |
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62 |
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63 BitMap::idx_t start_idx = card_bitmap_index_for(start); |
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64 BitMap::idx_t last_idx = card_bitmap_index_for(last); |
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65 |
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66 // The card bitmap is task/worker specific => no need to use 'par' routines. |
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67 // Set bits in the inclusive bit range [start_idx, last_idx]. |
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68 // |
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69 // For small ranges use a simple loop; otherwise use set_range |
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70 // The range are the cards that are spanned by the object/region |
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71 // so 8 cards will allow objects/regions up to 4K to be handled |
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72 // using the loop. |
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73 if ((last_idx - start_idx) <= 8) { |
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74 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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75 task_card_bm->set_bit(i); |
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76 } |
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77 } else { |
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78 assert(last_idx < task_card_bm->size(), "sanity"); |
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79 // Note: BitMap::set_range() is exclusive. |
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80 task_card_bm->set_range(start_idx, last_idx+1); |
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81 } |
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82 } |
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83 |
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84 // Counts the given memory region, which may be a single object, in the |
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85 // task/worker counting data structures for the given worker id. |
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86 inline void ConcurrentMark::count_region(MemRegion mr, uint worker_id) { |
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87 size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id); |
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88 BitMap* task_card_bm = count_card_bitmap_for(worker_id); |
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89 HeapWord* addr = mr.start(); |
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90 HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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91 count_region(mr, hr, marked_bytes_array, task_card_bm); |
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92 } |
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93 |
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94 // Counts the given object in the given task/worker counting data structures. |
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95 inline void ConcurrentMark::count_object(oop obj, |
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96 HeapRegion* hr, |
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97 size_t* marked_bytes_array, |
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98 BitMap* task_card_bm) { |
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99 MemRegion mr((HeapWord*)obj, obj->size()); |
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100 count_region(mr, hr, marked_bytes_array, task_card_bm); |
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101 } |
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102 |
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103 // Counts the given object in the task/worker counting data |
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104 // structures for the given worker id. |
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105 inline void ConcurrentMark::count_object(oop obj, HeapRegion* hr, uint worker_id) { |
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106 size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id); |
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107 BitMap* task_card_bm = count_card_bitmap_for(worker_id); |
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108 HeapWord* addr = (HeapWord*) obj; |
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109 count_object(obj, hr, marked_bytes_array, task_card_bm); |
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110 } |
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111 |
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112 // Attempts to mark the given object and, if successful, counts |
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113 // the object in the given task/worker counting structures. |
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114 inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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115 HeapRegion* hr, |
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116 size_t* marked_bytes_array, |
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117 BitMap* task_card_bm) { |
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118 HeapWord* addr = (HeapWord*)obj; |
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119 if (_nextMarkBitMap->parMark(addr)) { |
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120 // Update the task specific count data for the object. |
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121 count_object(obj, hr, marked_bytes_array, task_card_bm); |
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122 return true; |
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123 } |
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124 return false; |
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125 } |
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126 |
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127 // Attempts to mark the given object and, if successful, counts |
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128 // the object in the task/worker counting structures for the |
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129 // given worker id. |
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130 inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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131 HeapRegion* hr, |
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132 uint worker_id) { |
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133 HeapWord* addr = (HeapWord*)obj; |
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134 if (_nextMarkBitMap->parMark(addr)) { |
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135 // Update the task specific count data for the object. |
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136 count_object(obj, hr, worker_id); |
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137 return true; |
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138 } |
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139 return false; |
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140 } |
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141 |
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142 // As above - but we don't know the heap region containing the |
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143 // object and so have to supply it. |
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144 inline bool ConcurrentMark::par_mark_and_count(oop obj, uint worker_id) { |
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145 HeapWord* addr = (HeapWord*)obj; |
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146 HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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147 return par_mark_and_count(obj, hr, worker_id); |
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148 } |
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149 |
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150 // Similar to the above routine but we already know the size, in words, of |
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151 // the object that we wish to mark/count |
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152 inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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153 size_t word_size, |
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154 uint worker_id) { |
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155 HeapWord* addr = (HeapWord*)obj; |
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156 if (_nextMarkBitMap->parMark(addr)) { |
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157 // Update the task specific count data for the object. |
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158 MemRegion mr(addr, word_size); |
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159 count_region(mr, worker_id); |
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160 return true; |
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161 } |
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162 return false; |
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163 } |
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164 |
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165 // Unconditionally mark the given object, and unconditinally count |
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166 // the object in the counting structures for worker id 0. |
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167 // Should *not* be called from parallel code. |
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168 inline bool ConcurrentMark::mark_and_count(oop obj, HeapRegion* hr) { |
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169 HeapWord* addr = (HeapWord*)obj; |
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170 _nextMarkBitMap->mark(addr); |
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171 // Update the task specific count data for the object. |
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172 count_object(obj, hr, 0 /* worker_id */); |
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173 return true; |
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174 } |
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175 |
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176 // As above - but we don't have the heap region containing the |
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177 // object, so we have to supply it. |
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178 inline bool ConcurrentMark::mark_and_count(oop obj) { |
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179 HeapWord* addr = (HeapWord*)obj; |
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180 HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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181 return mark_and_count(obj, hr); |
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182 } |
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183 |
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184 inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { |
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185 HeapWord* start_addr = MAX2(startWord(), mr.start()); |
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186 HeapWord* end_addr = MIN2(endWord(), mr.end()); |
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187 |
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188 if (end_addr > start_addr) { |
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189 // Right-open interval [start-offset, end-offset). |
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190 BitMap::idx_t start_offset = heapWordToOffset(start_addr); |
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191 BitMap::idx_t end_offset = heapWordToOffset(end_addr); |
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192 |
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193 start_offset = _bm.get_next_one_offset(start_offset, end_offset); |
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194 while (start_offset < end_offset) { |
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195 HeapWord* obj_addr = offsetToHeapWord(start_offset); |
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196 oop obj = (oop) obj_addr; |
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197 if (!cl->do_bit(start_offset)) { |
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198 return false; |
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199 } |
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200 HeapWord* next_addr = MIN2(obj_addr + obj->size(), end_addr); |
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201 BitMap::idx_t next_offset = heapWordToOffset(next_addr); |
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202 start_offset = _bm.get_next_one_offset(next_offset, end_offset); |
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203 } |
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204 } |
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205 return true; |
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206 } |
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207 |
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208 inline bool CMBitMapRO::iterate(BitMapClosure* cl) { |
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209 MemRegion mr(startWord(), sizeInWords()); |
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210 return iterate(cl, mr); |
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211 } |
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212 |
3771 | 213 inline void CMTask::push(oop obj) { |
214 HeapWord* objAddr = (HeapWord*) obj; | |
215 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); | |
216 assert(!_g1h->is_on_master_free_list( | |
217 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); | |
218 assert(!_g1h->is_obj_ill(obj), "invariant"); | |
219 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); | |
220 | |
221 if (_cm->verbose_high()) { | |
222 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj); | |
223 } | |
224 | |
225 if (!_task_queue->push(obj)) { | |
226 // The local task queue looks full. We need to push some entries | |
227 // to the global stack. | |
228 | |
229 if (_cm->verbose_medium()) { | |
230 gclog_or_tty->print_cr("[%d] task queue overflow, " | |
231 "moving entries to the global stack", | |
232 _task_id); | |
233 } | |
234 move_entries_to_global_stack(); | |
235 | |
236 // this should succeed since, even if we overflow the global | |
237 // stack, we should have definitely removed some entries from the | |
238 // local queue. So, there must be space on it. | |
239 bool success = _task_queue->push(obj); | |
240 assert(success, "invariant"); | |
241 } | |
242 | |
243 statsOnly( int tmp_size = _task_queue->size(); | |
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244 if (tmp_size > _local_max_size) { |
3771 | 245 _local_max_size = tmp_size; |
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246 } |
3771 | 247 ++_local_pushes ); |
248 } | |
249 | |
250 // This determines whether the method below will check both the local | |
251 // and global fingers when determining whether to push on the stack a | |
252 // gray object (value 1) or whether it will only check the global one | |
253 // (value 0). The tradeoffs are that the former will be a bit more | |
254 // accurate and possibly push less on the stack, but it might also be | |
255 // a little bit slower. | |
256 | |
257 #define _CHECK_BOTH_FINGERS_ 1 | |
258 | |
259 inline void CMTask::deal_with_reference(oop obj) { | |
260 if (_cm->verbose_high()) { | |
261 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT, | |
262 _task_id, (void*) obj); | |
263 } | |
264 | |
265 ++_refs_reached; | |
266 | |
267 HeapWord* objAddr = (HeapWord*) obj; | |
268 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); | |
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269 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 270 assert(obj != NULL, "null check is implicit"); |
271 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
272 // Only get the containing region if the object is not marked on the | |
273 // bitmap (otherwise, it's a waste of time since we won't do | |
274 // anything with it). | |
275 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
276 if (!hr->obj_allocated_since_next_marking(obj)) { | |
277 if (_cm->verbose_high()) { | |
278 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked", | |
279 _task_id, (void*) obj); | |
280 } | |
281 | |
282 // we need to mark it first | |
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283 if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) { |
3771 | 284 // No OrderAccess:store_load() is needed. It is implicit in the |
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285 // CAS done in CMBitMap::parMark() call in the routine above. |
3771 | 286 HeapWord* global_finger = _cm->finger(); |
287 | |
288 #if _CHECK_BOTH_FINGERS_ | |
289 // we will check both the local and global fingers | |
290 | |
291 if (_finger != NULL && objAddr < _finger) { | |
292 if (_cm->verbose_high()) { | |
293 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), " | |
294 "pushing it", _task_id, _finger); | |
295 } | |
296 push(obj); | |
297 } else if (_curr_region != NULL && objAddr < _region_limit) { | |
298 // do nothing | |
299 } else if (objAddr < global_finger) { | |
300 // Notice that the global finger might be moving forward | |
301 // concurrently. This is not a problem. In the worst case, we | |
302 // mark the object while it is above the global finger and, by | |
303 // the time we read the global finger, it has moved forward | |
304 // passed this object. In this case, the object will probably | |
305 // be visited when a task is scanning the region and will also | |
306 // be pushed on the stack. So, some duplicate work, but no | |
307 // correctness problems. | |
308 | |
309 if (_cm->verbose_high()) { | |
310 gclog_or_tty->print_cr("[%d] below the global finger " | |
311 "("PTR_FORMAT"), pushing it", | |
312 _task_id, global_finger); | |
313 } | |
314 push(obj); | |
315 } else { | |
316 // do nothing | |
317 } | |
318 #else // _CHECK_BOTH_FINGERS_ | |
319 // we will only check the global finger | |
320 | |
321 if (objAddr < global_finger) { | |
322 // see long comment above | |
323 | |
324 if (_cm->verbose_high()) { | |
325 gclog_or_tty->print_cr("[%d] below the global finger " | |
326 "("PTR_FORMAT"), pushing it", | |
327 _task_id, global_finger); | |
328 } | |
329 push(obj); | |
330 } | |
331 #endif // _CHECK_BOTH_FINGERS_ | |
332 } | |
333 } | |
334 } | |
335 } | |
336 } | |
337 | |
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338 inline void ConcurrentMark::markPrev(oop p) { |
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339 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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340 // Note we are overriding the read-only view of the prev map here, via |
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341 // the cast. |
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342 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p); |
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343 } |
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344 |
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345 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size, uint worker_id) { |
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346 HeapWord* addr = (HeapWord*) obj; |
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347 |
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348 // Currently we don't do anything with word_size but we will use it |
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349 // in the very near future in the liveness calculation piggy-backing |
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350 // changes. |
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351 |
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352 #ifdef ASSERT |
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353 HeapRegion* hr = _g1h->heap_region_containing(addr); |
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354 assert(hr != NULL, "sanity"); |
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355 assert(!hr->is_survivor(), "should not allocate survivors during IM"); |
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356 assert(addr < hr->next_top_at_mark_start(), |
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357 err_msg("addr: "PTR_FORMAT" hr: "HR_FORMAT" NTAMS: "PTR_FORMAT, |
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358 addr, HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start())); |
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359 // We cannot assert that word_size == obj->size() given that obj |
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360 // might not be in a consistent state (another thread might be in |
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361 // the process of copying it). So the best thing we can do is to |
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362 // assert that word_size is under an upper bound which is its |
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363 // containing region's capacity. |
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364 assert(word_size * HeapWordSize <= hr->capacity(), |
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365 err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT, |
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366 word_size * HeapWordSize, hr->capacity(), |
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367 HR_FORMAT_PARAMS(hr))); |
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368 #endif // ASSERT |
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369 |
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370 if (!_nextMarkBitMap->isMarked(addr)) { |
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371 par_mark_and_count(obj, word_size, worker_id); |
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372 } |
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373 } |
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374 |
3771 | 375 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |