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annotate src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 4836:d30fa85f9994

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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
date Thu, 12 Jan 2012 00:06:47 -0800
parents 2e966d967c5c
children eff609af17d7
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1 /*
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2 * Copyright (c) 2001, 2012, 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 // 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
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213 inline void CMTask::push(oop obj) {
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214 HeapWord* objAddr = (HeapWord*) obj;
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215 assert(_g1h->is_in_g1_reserved(objAddr), "invariant");
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216 assert(!_g1h->is_on_master_free_list(
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217 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant");
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218 assert(!_g1h->is_obj_ill(obj), "invariant");
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219 assert(_nextMarkBitMap->isMarked(objAddr), "invariant");
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220
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221 if (_cm->verbose_high()) {
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222 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj);
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223 }
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224
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225 if (!_task_queue->push(obj)) {
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226 // The local task queue looks full. We need to push some entries
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227 // to the global stack.
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228
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229 if (_cm->verbose_medium()) {
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230 gclog_or_tty->print_cr("[%d] task queue overflow, "
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231 "moving entries to the global stack",
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232 _task_id);
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233 }
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234 move_entries_to_global_stack();
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235
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236 // this should succeed since, even if we overflow the global
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237 // stack, we should have definitely removed some entries from the
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238 // local queue. So, there must be space on it.
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239 bool success = _task_queue->push(obj);
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240 assert(success, "invariant");
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241 }
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242
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243 statsOnly( int tmp_size = _task_queue->size();
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244 if (tmp_size > _local_max_size) {
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245 _local_max_size = tmp_size;
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246 }
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247 ++_local_pushes );
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248 }
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249
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250 // This determines whether the method below will check both the local
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251 // and global fingers when determining whether to push on the stack a
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252 // gray object (value 1) or whether it will only check the global one
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253 // (value 0). The tradeoffs are that the former will be a bit more
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254 // accurate and possibly push less on the stack, but it might also be
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255 // a little bit slower.
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256
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257 #define _CHECK_BOTH_FINGERS_ 1
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258
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259 inline void CMTask::deal_with_reference(oop obj) {
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260 if (_cm->verbose_high()) {
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261 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT,
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262 _task_id, (void*) obj);
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263 }
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264
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265 ++_refs_reached;
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266
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267 HeapWord* objAddr = (HeapWord*) obj;
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268 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error");
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269 if (_g1h->is_in_g1_reserved(objAddr)) {
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270 assert(obj != NULL, "null check is implicit");
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271 if (!_nextMarkBitMap->isMarked(objAddr)) {
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272 // Only get the containing region if the object is not marked on the
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273 // bitmap (otherwise, it's a waste of time since we won't do
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274 // anything with it).
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275 HeapRegion* hr = _g1h->heap_region_containing_raw(obj);
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276 if (!hr->obj_allocated_since_next_marking(obj)) {
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277 if (_cm->verbose_high()) {
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278 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked",
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279 _task_id, (void*) obj);
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280 }
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281
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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)) {
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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.
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286 HeapWord* global_finger = _cm->finger();
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287
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288 #if _CHECK_BOTH_FINGERS_
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289 // we will check both the local and global fingers
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290
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291 if (_finger != NULL && objAddr < _finger) {
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292 if (_cm->verbose_high()) {
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293 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), "
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294 "pushing it", _task_id, _finger);
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295 }
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296 push(obj);
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297 } else if (_curr_region != NULL && objAddr < _region_limit) {
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298 // do nothing
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299 } else if (objAddr < global_finger) {
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300 // Notice that the global finger might be moving forward
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301 // concurrently. This is not a problem. In the worst case, we
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302 // mark the object while it is above the global finger and, by
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303 // the time we read the global finger, it has moved forward
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304 // passed this object. In this case, the object will probably
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305 // be visited when a task is scanning the region and will also
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306 // be pushed on the stack. So, some duplicate work, but no
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307 // correctness problems.
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308
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309 if (_cm->verbose_high()) {
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310 gclog_or_tty->print_cr("[%d] below the global finger "
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311 "("PTR_FORMAT"), pushing it",
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312 _task_id, global_finger);
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313 }
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314 push(obj);
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315 } else {
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316 // do nothing
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317 }
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318 #else // _CHECK_BOTH_FINGERS_
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319 // we will only check the global finger
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320
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321 if (objAddr < global_finger) {
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322 // see long comment above
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323
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324 if (_cm->verbose_high()) {
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325 gclog_or_tty->print_cr("[%d] below the global finger "
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326 "("PTR_FORMAT"), pushing it",
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327 _task_id, global_finger);
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328 }
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329 push(obj);
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330 }
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331 #endif // _CHECK_BOTH_FINGERS_
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332 }
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333 }
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334 }
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335 }
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336 }
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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
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375 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP