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20337
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1 /*
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2 * Copyright (c) 2001, 2013, 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/g1BiasedArray.hpp"
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27 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
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28 #include "runtime/virtualspace.hpp"
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29 #include "services/memTracker.hpp"
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30 #include "utilities/bitMap.inline.hpp"
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31
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32 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
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33 size_t commit_granularity,
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34 size_t region_granularity,
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35 MemoryType type) :
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36 _storage(),
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37 _commit_granularity(commit_granularity),
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38 _region_granularity(region_granularity),
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39 _listener(NULL),
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40 _commit_map() {
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41 guarantee(is_power_of_2(commit_granularity), "must be");
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42 guarantee(is_power_of_2(region_granularity), "must be");
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43 _storage.initialize_with_granularity(rs, commit_granularity);
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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 os_commit_granularity,
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58 size_t alloc_granularity,
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59 size_t commit_factor,
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60 MemoryType type) :
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61 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
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62 _pages_per_region(alloc_granularity / (os_commit_granularity * commit_factor)) {
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63
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64 guarantee(alloc_granularity >= os_commit_granularity, "allocation granularity smaller than commit granularity");
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65 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
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66 }
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67
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68 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
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69 _storage.commit(start_idx * _pages_per_region, num_regions * _pages_per_region);
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70 _commit_map.set_range(start_idx, start_idx + num_regions);
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71 fire_on_commit(start_idx, num_regions);
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72 }
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73
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74 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
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75 _storage.uncommit(start_idx * _pages_per_region, num_regions * _pages_per_region);
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76 _commit_map.clear_range(start_idx, start_idx + num_regions);
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77 }
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78 };
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79
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80 // G1RegionToSpaceMapper implementation where the region granularity is smaller
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81 // than the commit granularity.
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82 // Basically, the contents of one OS page span several regions.
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83 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
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84 private:
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85 class CommitRefcountArray : public G1BiasedMappedArray<uint> {
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86 protected:
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87 virtual uint default_value() const { return 0; }
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88 };
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89
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90 size_t _regions_per_page;
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91
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92 CommitRefcountArray _refcounts;
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93
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94 uintptr_t region_idx_to_page_idx(uint region) const {
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95 return region / _regions_per_page;
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96 }
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97
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98 public:
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99 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
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100 size_t os_commit_granularity,
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101 size_t alloc_granularity,
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102 size_t commit_factor,
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103 MemoryType type) :
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104 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
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105 _regions_per_page((os_commit_granularity * commit_factor) / alloc_granularity), _refcounts() {
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106
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107 guarantee((os_commit_granularity * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
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108 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + rs.size()), os_commit_granularity);
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109 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
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110 }
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111
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112 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
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113 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
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114 assert(!_commit_map.at(i), err_msg("Trying to commit storage at region "INTPTR_FORMAT" that is already committed", i));
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115 uintptr_t idx = region_idx_to_page_idx(i);
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116 uint old_refcount = _refcounts.get_by_index(idx);
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117 if (old_refcount == 0) {
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118 _storage.commit(idx, 1);
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119 }
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120 _refcounts.set_by_index(idx, old_refcount + 1);
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121 _commit_map.set_bit(i);
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122 fire_on_commit(i, 1);
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123 }
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124 }
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125
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126 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
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127 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
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128 assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region "INTPTR_FORMAT" that is not committed", i));
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129 uintptr_t idx = region_idx_to_page_idx(i);
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130 uint old_refcount = _refcounts.get_by_index(idx);
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131 assert(old_refcount > 0, "must be");
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132 if (old_refcount == 1) {
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133 _storage.uncommit(idx, 1);
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134 }
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135 _refcounts.set_by_index(idx, old_refcount - 1);
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136 _commit_map.clear_bit(i);
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137 }
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138 }
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139 };
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140
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141 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions) {
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142 if (_listener != NULL) {
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143 _listener->on_commit(start_idx, num_regions);
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144 }
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145 }
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146
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147 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs,
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148 size_t os_commit_granularity,
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149 size_t region_granularity,
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150 size_t commit_factor,
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151 MemoryType type) {
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152
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153 if (region_granularity >= (os_commit_granularity * commit_factor)) {
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154 return new G1RegionsLargerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
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155 } else {
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156 return new G1RegionsSmallerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
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157 }
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158 }
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