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annotate src/share/vm/gc_implementation/g1/heapRegionManager.cpp @ 20382:b1266b08b994

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8056043: Heap does not shrink within the heap after JDK-8038423 Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too. Reviewed-by: jwilhelm, jmasa
author tschatzl
date Wed, 03 Sep 2014 09:24:07 +0200
parents a8ea2f110d87
children d35872270666
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1 /*
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/heapRegion.hpp"
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27 #include "gc_implementation/g1/heapRegionManager.inline.hpp"
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28 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
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29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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30 #include "gc_implementation/g1/concurrentG1Refine.hpp"
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31 #include "memory/allocation.hpp"
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32
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33 void HeapRegionManager::initialize(G1RegionToSpaceMapper* heap_storage,
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34 G1RegionToSpaceMapper* prev_bitmap,
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35 G1RegionToSpaceMapper* next_bitmap,
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36 G1RegionToSpaceMapper* bot,
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37 G1RegionToSpaceMapper* cardtable,
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38 G1RegionToSpaceMapper* card_counts) {
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39 _allocated_heapregions_length = 0;
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40
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41 _heap_mapper = heap_storage;
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42
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43 _prev_bitmap_mapper = prev_bitmap;
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44 _next_bitmap_mapper = next_bitmap;
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45
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46 _bot_mapper = bot;
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47 _cardtable_mapper = cardtable;
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48
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49 _card_counts_mapper = card_counts;
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50
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51 MemRegion reserved = heap_storage->reserved();
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52 _regions.initialize(reserved.start(), reserved.end(), HeapRegion::GrainBytes);
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53
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54 _available_map.resize(_regions.length(), false);
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55 _available_map.clear();
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56 }
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57
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58 bool HeapRegionManager::is_available(uint region) const {
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59 return _available_map.at(region);
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60 }
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61
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62 #ifdef ASSERT
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63 bool HeapRegionManager::is_free(HeapRegion* hr) const {
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64 return _free_list.contains(hr);
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65 }
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66 #endif
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67
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68 HeapRegion* HeapRegionManager::new_heap_region(uint hrm_index) {
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69 HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(hrm_index);
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70 MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
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71 assert(reserved().contains(mr), "invariant");
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72 return new HeapRegion(hrm_index, G1CollectedHeap::heap()->bot_shared(), mr);
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73 }
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74
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75 void HeapRegionManager::commit_regions(uint index, size_t num_regions) {
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76 guarantee(num_regions > 0, "Must commit more than zero regions");
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77 guarantee(_num_committed + num_regions <= max_length(), "Cannot commit more than the maximum amount of regions");
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78
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79 _num_committed += (uint)num_regions;
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80
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81 _heap_mapper->commit_regions(index, num_regions);
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82
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83 // Also commit auxiliary data
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84 _prev_bitmap_mapper->commit_regions(index, num_regions);
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85 _next_bitmap_mapper->commit_regions(index, num_regions);
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86
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87 _bot_mapper->commit_regions(index, num_regions);
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88 _cardtable_mapper->commit_regions(index, num_regions);
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89
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90 _card_counts_mapper->commit_regions(index, num_regions);
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91 }
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92
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93 void HeapRegionManager::uncommit_regions(uint start, size_t num_regions) {
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94 guarantee(num_regions >= 1, err_msg("Need to specify at least one region to uncommit, tried to uncommit zero regions at %u", start));
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95 guarantee(_num_committed >= num_regions, "pre-condition");
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96
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97 // Print before uncommitting.
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98 if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
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99 for (uint i = start; i < start + num_regions; i++) {
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100 HeapRegion* hr = at(i);
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101 G1CollectedHeap::heap()->hr_printer()->uncommit(hr->bottom(), hr->end());
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102 }
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103 }
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104
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105 _num_committed -= (uint)num_regions;
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106
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107 _available_map.par_clear_range(start, start + num_regions, BitMap::unknown_range);
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108 _heap_mapper->uncommit_regions(start, num_regions);
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109
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110 // Also uncommit auxiliary data
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111 _prev_bitmap_mapper->uncommit_regions(start, num_regions);
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112 _next_bitmap_mapper->uncommit_regions(start, num_regions);
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113
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114 _bot_mapper->uncommit_regions(start, num_regions);
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115 _cardtable_mapper->uncommit_regions(start, num_regions);
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116
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117 _card_counts_mapper->uncommit_regions(start, num_regions);
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118 }
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119
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120 void HeapRegionManager::make_regions_available(uint start, uint num_regions) {
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121 guarantee(num_regions > 0, "No point in calling this for zero regions");
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122 commit_regions(start, num_regions);
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123 for (uint i = start; i < start + num_regions; i++) {
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124 if (_regions.get_by_index(i) == NULL) {
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125 HeapRegion* new_hr = new_heap_region(i);
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126 _regions.set_by_index(i, new_hr);
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127 _allocated_heapregions_length = MAX2(_allocated_heapregions_length, i + 1);
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128 }
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129 }
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130
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131 _available_map.par_set_range(start, start + num_regions, BitMap::unknown_range);
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132
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133 for (uint i = start; i < start + num_regions; i++) {
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134 assert(is_available(i), err_msg("Just made region %u available but is apparently not.", i));
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135 HeapRegion* hr = at(i);
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136 if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
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137 G1CollectedHeap::heap()->hr_printer()->commit(hr->bottom(), hr->end());
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138 }
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139 HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(i);
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140 MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
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141
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142 hr->initialize(mr);
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143 insert_into_free_list(at(i));
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144 }
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145 }
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146
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147 uint HeapRegionManager::expand_by(uint num_regions) {
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148 return expand_at(0, num_regions);
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149 }
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150
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151 uint HeapRegionManager::expand_at(uint start, uint num_regions) {
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152 if (num_regions == 0) {
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153 return 0;
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154 }
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155
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156 uint cur = start;
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157 uint idx_last_found = 0;
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158 uint num_last_found = 0;
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159
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160 uint expanded = 0;
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161
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162 while (expanded < num_regions &&
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163 (num_last_found = find_unavailable_from_idx(cur, &idx_last_found)) > 0) {
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164 uint to_expand = MIN2(num_regions - expanded, num_last_found);
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165 make_regions_available(idx_last_found, to_expand);
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166 expanded += to_expand;
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167 cur = idx_last_found + num_last_found + 1;
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168 }
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169
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170 verify_optional();
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171 return expanded;
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172 }
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173
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174 uint HeapRegionManager::find_contiguous(size_t num, bool empty_only) {
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175 uint found = 0;
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176 size_t length_found = 0;
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177 uint cur = 0;
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178
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179 while (length_found < num && cur < max_length()) {
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180 HeapRegion* hr = _regions.get_by_index(cur);
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181 if ((!empty_only && !is_available(cur)) || (is_available(cur) && hr != NULL && hr->is_empty())) {
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182 // This region is a potential candidate for allocation into.
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183 length_found++;
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184 } else {
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185 // This region is not a candidate. The next region is the next possible one.
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186 found = cur + 1;
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187 length_found = 0;
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188 }
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189 cur++;
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190 }
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191
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192 if (length_found == num) {
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193 for (uint i = found; i < (found + num); i++) {
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194 HeapRegion* hr = _regions.get_by_index(i);
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195 // sanity check
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196 guarantee((!empty_only && !is_available(i)) || (is_available(i) && hr != NULL && hr->is_empty()),
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197 err_msg("Found region sequence starting at " UINT32_FORMAT ", length " SIZE_FORMAT
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198 " that is not empty at " UINT32_FORMAT ". Hr is " PTR_FORMAT, found, num, i, p2i(hr)));
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199 }
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200 return found;
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201 } else {
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202 return G1_NO_HRM_INDEX;
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203 }
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204 }
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205
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206 HeapRegion* HeapRegionManager::next_region_in_heap(const HeapRegion* r) const {
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207 guarantee(r != NULL, "Start region must be a valid region");
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208 guarantee(is_available(r->hrm_index()), err_msg("Trying to iterate starting from region %u which is not in the heap", r->hrm_index()));
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209 for (uint i = r->hrm_index() + 1; i < _allocated_heapregions_length; i++) {
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210 HeapRegion* hr = _regions.get_by_index(i);
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211 if (is_available(i)) {
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212 return hr;
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213 }
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214 }
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215 return NULL;
342
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216 }
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217
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218 void HeapRegionManager::iterate(HeapRegionClosure* blk) const {
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219 uint len = max_length();
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220
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221 for (uint i = 0; i < len; i++) {
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222 if (!is_available(i)) {
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223 continue;
342
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224 }
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225 guarantee(at(i) != NULL, err_msg("Tried to access region %u that has a NULL HeapRegion*", i));
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226 bool res = blk->doHeapRegion(at(i));
342
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227 if (res) {
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228 blk->incomplete();
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229 return;
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230 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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231 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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diff changeset
232 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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233
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234 uint HeapRegionManager::find_unavailable_from_idx(uint start_idx, uint* res_idx) const {
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235 guarantee(res_idx != NULL, "checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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236 guarantee(start_idx <= (max_length() + 1), "checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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237
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238 uint num_regions = 0;
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239
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240 uint cur = start_idx;
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241 while (cur < max_length() && is_available(cur)) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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242 cur++;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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243 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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244 if (cur == max_length()) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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245 return num_regions;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
246 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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247 *res_idx = cur;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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248 while (cur < max_length() && !is_available(cur)) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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249 cur++;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
250 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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251 num_regions = cur - *res_idx;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
252 #ifdef ASSERT
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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253 for (uint i = *res_idx; i < (*res_idx + num_regions); i++) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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254 assert(!is_available(i), "just checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
255 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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256 assert(cur == max_length() || num_regions == 0 || is_available(cur),
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257 err_msg("The region at the current position %u must be available or at the end of the heap.", cur));
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diff changeset
258 #endif
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259 return num_regions;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
260 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
261
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262 uint HeapRegionManager::start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const {
20336
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263 return num_regions * worker_i / num_workers;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
264 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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265
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266 void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, uint num_workers, jint claim_value) const {
20336
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267 const uint start_index = start_region_for_worker(worker_id, num_workers, _allocated_heapregions_length);
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268
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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269 // Every worker will actually look at all regions, skipping over regions that
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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270 // are currently not committed.
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271 // This also (potentially) iterates over regions newly allocated during GC. This
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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272 // is no problem except for some extra work.
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273 for (uint count = 0; count < _allocated_heapregions_length; count++) {
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274 const uint index = (start_index + count) % _allocated_heapregions_length;
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275 assert(0 <= index && index < _allocated_heapregions_length, "sanity");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
276 // Skip over unavailable regions
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
277 if (!is_available(index)) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
278 continue;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
279 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
280 HeapRegion* r = _regions.get_by_index(index);
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281 // We'll ignore "continues humongous" regions (we'll process them
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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282 // when we come across their corresponding "start humongous"
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
283 // region) and regions already claimed.
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
284 if (r->claim_value() == claim_value || r->continuesHumongous()) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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285 continue;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
286 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
287 // OK, try to claim it
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
288 if (!r->claimHeapRegion(claim_value)) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
289 continue;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
290 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
291 // Success!
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
292 if (r->startsHumongous()) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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293 // If the region is "starts humongous" we'll iterate over its
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294 // "continues humongous" first; in fact we'll do them
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295 // first. The order is important. In one case, calling the
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296 // closure on the "starts humongous" region might de-allocate
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297 // and clear all its "continues humongous" regions and, as a
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298 // result, we might end up processing them twice. So, we'll do
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299 // them first (note: most closures will ignore them anyway) and
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300 // then we'll do the "starts humongous" region.
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301 for (uint ch_index = index + 1; ch_index < index + r->region_num(); ch_index++) {
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302 HeapRegion* chr = _regions.get_by_index(ch_index);
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303
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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304 assert(chr->continuesHumongous(), "Must be humongous region");
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diff changeset
305 assert(chr->humongous_start_region() == r,
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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306 err_msg("Must work on humongous continuation of the original start region "
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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307 PTR_FORMAT ", but is " PTR_FORMAT, p2i(r), p2i(chr)));
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308 assert(chr->claim_value() != claim_value,
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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309 "Must not have been claimed yet because claiming of humongous continuation first claims the start region");
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310
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311 bool claim_result = chr->claimHeapRegion(claim_value);
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312 // We should always be able to claim it; no one else should
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313 // be trying to claim this region.
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314 guarantee(claim_result, "We should always be able to claim the continuesHumongous part of the humongous object");
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315
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316 bool res2 = blk->doHeapRegion(chr);
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317 if (res2) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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318 return;
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319 }
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320
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321 // Right now, this holds (i.e., no closure that actually
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322 // does something with "continues humongous" regions
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323 // clears them). We might have to weaken it in the future,
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324 // but let's leave these two asserts here for extra safety.
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325 assert(chr->continuesHumongous(), "should still be the case");
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326 assert(chr->humongous_start_region() == r, "sanity");
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327 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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328 }
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329
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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330 bool res = blk->doHeapRegion(r);
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331 if (res) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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332 return;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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333 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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334 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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335 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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336
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337 uint HeapRegionManager::shrink_by(uint num_regions_to_remove) {
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338 assert(length() > 0, "the region sequence should not be empty");
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339 assert(length() <= _allocated_heapregions_length, "invariant");
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340 assert(_allocated_heapregions_length > 0, "we should have at least one region committed");
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b0d20fa374b4 8013872: G1: HeapRegionSeq::shrink_by() has invalid assert
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341 assert(num_regions_to_remove < length(), "We should never remove all regions");
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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342
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343 if (num_regions_to_remove == 0) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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344 return 0;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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345 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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346
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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347 uint removed = 0;
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348 uint cur = _allocated_heapregions_length - 1;
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349 uint idx_last_found = 0;
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350 uint num_last_found = 0;
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351
20337
1f1d373cd044 8038423: G1: Decommit memory within heap
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352 while ((removed < num_regions_to_remove) &&
1f1d373cd044 8038423: G1: Decommit memory within heap
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353 (num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) {
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354 uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found);
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355
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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356 uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove);
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357
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358 cur -= num_last_found;
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359 removed += to_remove;
342
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360 }
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361
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362 verify_optional();
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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363
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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364 return removed;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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365 }
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diff changeset
366
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367 uint HeapRegionManager::find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const {
20336
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368 guarantee(start_idx < _allocated_heapregions_length, "checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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369 guarantee(res_idx != NULL, "checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
370
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371 uint num_regions_found = 0;
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diff changeset
372
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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373 jlong cur = start_idx;
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diff changeset
374 while (cur != -1 && !(is_available(cur) && at(cur)->is_empty())) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
375 cur--;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
376 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
377 if (cur == -1) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
378 return num_regions_found;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
379 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
380 jlong old_cur = cur;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
381 // cur indexes the first empty region
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
382 while (cur != -1 && is_available(cur) && at(cur)->is_empty()) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
383 cur--;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
384 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
385 *res_idx = cur + 1;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
386 num_regions_found = old_cur - cur;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
387
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
388 #ifdef ASSERT
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
389 for (uint i = *res_idx; i < (*res_idx + num_regions_found); i++) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
390 assert(at(i)->is_empty(), "just checking");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
391 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
392 #endif
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
393 return num_regions_found;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
394 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
395
20377
a8ea2f110d87 8054819: Rename HeapRegionSeq to HeapRegionManager
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diff changeset
396 void HeapRegionManager::verify() {
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
397 guarantee(length() <= _allocated_heapregions_length,
6010
720b6a76dd9d 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 3766
diff changeset
398 err_msg("invariant: _length: %u _allocated_length: %u",
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
399 length(), _allocated_heapregions_length));
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
400 guarantee(_allocated_heapregions_length <= max_length(),
6010
720b6a76dd9d 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 3766
diff changeset
401 err_msg("invariant: _allocated_length: %u _max_length: %u",
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
402 _allocated_heapregions_length, max_length()));
3766
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
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parents: 2361
diff changeset
403
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
404 bool prev_committed = true;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
405 uint num_committed = 0;
12305
a19bea467577 7163191: G1: introduce a "heap spanning table" abstraction
tschatzl
parents: 10242
diff changeset
406 HeapWord* prev_end = heap_bottom();
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
407 for (uint i = 0; i < _allocated_heapregions_length; i++) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
408 if (!is_available(i)) {
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
409 prev_committed = false;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
410 continue;
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
411 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
412 num_committed++;
12305
a19bea467577 7163191: G1: introduce a "heap spanning table" abstraction
tschatzl
parents: 10242
diff changeset
413 HeapRegion* hr = _regions.get_by_index(i);
6010
720b6a76dd9d 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 3766
diff changeset
414 guarantee(hr != NULL, err_msg("invariant: i: %u", i));
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
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diff changeset
415 guarantee(!prev_committed || hr->bottom() == prev_end,
6010
720b6a76dd9d 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 3766
diff changeset
416 err_msg("invariant i: %u "HR_FORMAT" prev_end: "PTR_FORMAT,
17937
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 17736
diff changeset
417 i, HR_FORMAT_PARAMS(hr), p2i(prev_end)));
20377
a8ea2f110d87 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 20337
diff changeset
418 guarantee(hr->hrm_index() == i,
a8ea2f110d87 8054819: Rename HeapRegionSeq to HeapRegionManager
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parents: 20337
diff changeset
419 err_msg("invariant: i: %u hrm_index(): %u", i, hr->hrm_index()));
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
420 // Asserts will fire if i is >= _length
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
421 HeapWord* addr = hr->bottom();
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
422 guarantee(addr_to_region(addr) == hr, "sanity");
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
423 // We cannot check whether the region is part of a particular set: at the time
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
424 // this method may be called, we have only completed allocation of the regions,
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
425 // but not put into a region set.
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
426 prev_committed = true;
3766
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
diff changeset
427 if (hr->startsHumongous()) {
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
diff changeset
428 prev_end = hr->orig_end();
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
diff changeset
429 } else {
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
diff changeset
430 prev_end = hr->end();
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
diff changeset
431 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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parents:
diff changeset
432 }
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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diff changeset
433 for (uint i = _allocated_heapregions_length; i < max_length(); i++) {
12305
a19bea467577 7163191: G1: introduce a "heap spanning table" abstraction
tschatzl
parents: 10242
diff changeset
434 guarantee(_regions.get_by_index(i) == NULL, err_msg("invariant i: %u", i));
3766
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
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diff changeset
435 }
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
436
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
437 guarantee(num_committed == _num_committed, err_msg("Found %u committed regions, but should be %u", num_committed, _num_committed));
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
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438 _free_list.verify();
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
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439 }
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
diff changeset
440
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
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441 #ifndef PRODUCT
20377
a8ea2f110d87 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
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442 void HeapRegionManager::verify_optional() {
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
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443 verify();
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
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444 }
3766
c3f1170908be 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 2361
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445 #endif // PRODUCT
20336
6701abbc4441 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 20335
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446