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1 /* |
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2 * Copyright (c) 2001, 2015, 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/g1/g1BiasedArray.hpp" |
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27 #include "gc/g1/g1RegionToSpaceMapper.hpp" |
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28 #include "memory/allocation.inline.hpp" |
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29 #include "memory/virtualspace.hpp" |
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30 #include "services/memTracker.hpp" |
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31 #include "utilities/bitMap.inline.hpp" |
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32 |
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33 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs, |
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34 size_t used_size, |
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35 size_t page_size, |
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36 size_t region_granularity, |
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37 MemoryType type) : |
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38 _storage(rs, used_size, page_size), |
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39 _region_granularity(region_granularity), |
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40 _listener(NULL), |
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41 _commit_map() { |
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42 guarantee(is_power_of_2(page_size), "must be"); |
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43 guarantee(is_power_of_2(region_granularity), "must be"); |
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44 |
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45 MemTracker::record_virtual_memory_type((address)rs.base(), type); |
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46 } |
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47 |
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48 // G1RegionToSpaceMapper implementation where the region granularity is larger than |
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49 // or the same as the commit granularity. |
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50 // Basically, the space corresponding to one region region spans several OS pages. |
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51 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper { |
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52 private: |
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53 size_t _pages_per_region; |
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54 |
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55 public: |
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56 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs, |
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57 size_t actual_size, |
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58 size_t page_size, |
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59 size_t alloc_granularity, |
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60 size_t commit_factor, |
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61 MemoryType type) : |
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62 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), |
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63 _pages_per_region(alloc_granularity / (page_size * commit_factor)) { |
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64 |
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65 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity"); |
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66 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); |
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67 } |
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68 |
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69 virtual void commit_regions(uint start_idx, size_t num_regions) { |
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70 bool zero_filled = _storage.commit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); |
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71 _commit_map.set_range(start_idx, start_idx + num_regions); |
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72 fire_on_commit(start_idx, num_regions, zero_filled); |
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73 } |
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74 |
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75 virtual void uncommit_regions(uint start_idx, size_t num_regions) { |
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76 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); |
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77 _commit_map.clear_range(start_idx, start_idx + num_regions); |
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78 } |
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79 }; |
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80 |
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81 // G1RegionToSpaceMapper implementation where the region granularity is smaller |
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82 // than the commit granularity. |
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83 // Basically, the contents of one OS page span several regions. |
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84 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper { |
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85 private: |
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86 class CommitRefcountArray : public G1BiasedMappedArray<uint> { |
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87 protected: |
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88 virtual uint default_value() const { return 0; } |
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89 }; |
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90 |
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91 size_t _regions_per_page; |
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92 |
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93 CommitRefcountArray _refcounts; |
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94 |
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95 uintptr_t region_idx_to_page_idx(uint region) const { |
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96 return region / _regions_per_page; |
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97 } |
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98 |
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99 public: |
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100 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, |
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101 size_t actual_size, |
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102 size_t page_size, |
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103 size_t alloc_granularity, |
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104 size_t commit_factor, |
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105 MemoryType type) : |
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106 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), |
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107 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { |
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108 |
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109 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); |
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110 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_size_up(rs.size(), page_size)), page_size); |
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111 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); |
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112 } |
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113 |
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114 virtual void commit_regions(uint start_idx, size_t num_regions) { |
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115 for (uint i = start_idx; i < start_idx + num_regions; i++) { |
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116 assert(!_commit_map.at(i), err_msg("Trying to commit storage at region %u that is already committed", i)); |
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117 size_t idx = region_idx_to_page_idx(i); |
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118 uint old_refcount = _refcounts.get_by_index(idx); |
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119 bool zero_filled = false; |
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120 if (old_refcount == 0) { |
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121 zero_filled = _storage.commit(idx, 1); |
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122 } |
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123 _refcounts.set_by_index(idx, old_refcount + 1); |
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124 _commit_map.set_bit(i); |
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125 fire_on_commit(i, 1, zero_filled); |
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126 } |
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127 } |
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128 |
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129 virtual void uncommit_regions(uint start_idx, size_t num_regions) { |
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130 for (uint i = start_idx; i < start_idx + num_regions; i++) { |
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131 assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region %u that is not committed", i)); |
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132 size_t idx = region_idx_to_page_idx(i); |
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133 uint old_refcount = _refcounts.get_by_index(idx); |
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134 assert(old_refcount > 0, "must be"); |
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135 if (old_refcount == 1) { |
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136 _storage.uncommit(idx, 1); |
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137 } |
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138 _refcounts.set_by_index(idx, old_refcount - 1); |
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139 _commit_map.clear_bit(i); |
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140 } |
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141 } |
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142 }; |
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143 |
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144 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) { |
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145 if (_listener != NULL) { |
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146 _listener->on_commit(start_idx, num_regions, zero_filled); |
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147 } |
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148 } |
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149 |
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150 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs, |
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151 size_t actual_size, |
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152 size_t page_size, |
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153 size_t region_granularity, |
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154 size_t commit_factor, |
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155 MemoryType type) { |
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156 |
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157 if (region_granularity >= (page_size * commit_factor)) { |
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158 return new G1RegionsLargerThanCommitSizeMapper(rs, actual_size, page_size, region_granularity, commit_factor, type); |
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159 } else { |
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160 return new G1RegionsSmallerThanCommitSizeMapper(rs, actual_size, page_size, region_granularity, commit_factor, type); |
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161 } |
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162 } |