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annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 20336:6701abbc4441

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8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data Summary: Let HeapRegionSeq manage the heap region and auxiliary data to decrease the amount of responsibilities of G1CollectedHeap, and encapsulate this work from other code. Reviewed-by: jwilhelm, jmasa, mgerdin, brutisso
author tschatzl
date Tue, 19 Aug 2014 10:50:27 +0200
parents eec72fa4b108
children 1f1d373cd044
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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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27
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28 #include "gc_implementation/g1/g1BiasedArray.hpp"
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29 #include "gc_implementation/g1/heapRegionSet.hpp"
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30
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31 class HeapRegion;
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32 class HeapRegionClosure;
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33 class FreeRegionList;
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34
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35 class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
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36 protected:
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37 virtual HeapRegion* default_value() const { return NULL; }
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38 };
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39
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40 // This class keeps track of the region metadata (i.e., HeapRegion
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41 // instances). They are kept in the _regions array in address
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42 // order. A region's index in the array corresponds to its index in
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43 // the heap (i.e., 0 is the region at the bottom of the heap, 1 is
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44 // the one after it, etc.). Two regions that are consecutive in the
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45 // array should also be adjacent in the address space (i.e.,
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46 // region(i).end() == region(i+1).bottom().
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47 //
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48 // We create a HeapRegion when we commit the region's address space
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49 // for the first time. When we uncommit the address space of a
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50 // region we retain the HeapRegion to be able to re-use it in the
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51 // future (in case we recommit it).
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52 //
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53 // We keep track of three lengths:
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54 //
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55 // * _committed_length (returned by length()) is the number of currently
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56 // committed regions.
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57 // * _allocated_length (not exposed outside this class) is the
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58 // number of regions for which we have HeapRegions.
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59 // * max_length() returns the maximum number of regions the heap can have.
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60 //
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61 // and maintain that: _committed_length <= _allocated_length <= max_length()
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62
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63 class HeapRegionSeq: public CHeapObj<mtGC> {
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64 friend class VMStructs;
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65
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66 G1HeapRegionTable _regions;
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67
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68 ReservedSpace _reserved;
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69 VirtualSpace _storage;
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70
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71 FreeRegionList _free_list;
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72
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73 // The number of regions committed in the heap.
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74 uint _num_committed;
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75
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76 // Internal only. The highest heap region +1 we allocated a HeapRegion instance for.
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77 uint _allocated_heapregions_length;
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78
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79 HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); }
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80 HeapWord* heap_top() const { return heap_bottom() + _num_committed * HeapRegion::GrainWords; }
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81 HeapWord* heap_end() const {return _regions.end_address_mapped(); }
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82
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83 void make_regions_available(uint index, uint num_regions = 1);
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84
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85 // Pass down commit calls to the VirtualSpace.
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86 void commit_regions(uint index, size_t num_regions = 1);
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87 void uncommit_regions(uint index, size_t num_regions = 1);
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88
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89 // Notify other data structures about change in the heap layout.
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90 void update_committed_space(HeapWord* old_end, HeapWord* new_end);
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91 // Calculate the starting region for each worker during parallel iteration so
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92 // that they do not all start from the same region.
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93 uint start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const;
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94
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95 // Finds the next sequence of unavailable regions starting from start_idx. Returns the
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96 // length of the sequence found. If this result is zero, no such sequence could be found,
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97 // otherwise res_idx indicates the start index of these regions.
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98 uint find_unavailable_from_idx(uint start_idx, uint* res_idx) const;
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99 // Finds the next sequence of empty regions starting from start_idx, going backwards in
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100 // the heap. Returns the length of the sequence found. If this value is zero, no
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101 // sequence could be found, otherwise res_idx contains the start index of this range.
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102 uint find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const;
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103 #ifdef ASSERT
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104 public:
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105 bool is_free(HeapRegion* hr) const;
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106 #endif
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107 // Returns whether the given region is available for allocation.
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108 bool is_available(uint region) const;
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109
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110 // Allocate a new HeapRegion for the given index.
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111 HeapRegion* new_heap_region(uint hrs_index);
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112 public:
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113 // Empty constructor, we'll initialize it with the initialize() method.
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114 HeapRegionSeq() : _regions(), _reserved(), _storage(), _num_committed(0),
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115 _free_list("Master Free List", new MasterFreeRegionListMtSafeChecker()),
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116 _allocated_heapregions_length(0)
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117 { }
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118
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119 void initialize(ReservedSpace reserved);
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120
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121 // Return the "dummy" region used for G1AllocRegion. This is currently a hardwired
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122 // new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit
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123 // the heap from the lowest address, this region (and its associated data
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124 // structures) are available and we do not need to check further.
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125 HeapRegion* get_dummy_region() { return new_heap_region(0); }
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126
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127 // Return the HeapRegion at the given index. Assume that the index
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128 // is valid.
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129 inline HeapRegion* at(uint index) const;
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130
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131 // If addr is within the committed space return its corresponding
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132 // HeapRegion, otherwise return NULL.
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133 inline HeapRegion* addr_to_region(HeapWord* addr) const;
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134
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135 // Insert the given region into the free region list.
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136 inline void insert_into_free_list(HeapRegion* hr);
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137
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138 // Insert the given region list into the global free region list.
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139 void insert_list_into_free_list(FreeRegionList* list) {
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140 _free_list.add_ordered(list);
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141 }
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142
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143 HeapRegion* allocate_free_region(bool is_old) {
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144 HeapRegion* hr = _free_list.remove_region(is_old);
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145
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146 if (hr != NULL) {
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147 assert(hr->next() == NULL, "Single region should not have next");
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148 assert(is_available(hr->hrs_index()), "Must be committed");
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149 }
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150 return hr;
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151 }
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152
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153 inline void allocate_free_regions_starting_at(uint first, uint num_regions);
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154
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155 // Remove all regions from the free list.
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156 void remove_all_free_regions() {
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157 _free_list.remove_all();
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158 }
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159
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160 // Return the number of committed free regions in the heap.
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161 uint num_free_regions() const {
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162 return _free_list.length();
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163 }
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164
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165 size_t total_capacity_bytes() const {
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166 return num_free_regions() * HeapRegion::GrainBytes;
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167 }
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168
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169 // Return the number of available (uncommitted) regions.
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170 uint available() const { return max_length() - length(); }
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171
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172 // Return the number of regions that have been committed in the heap.
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173 uint length() const { return _num_committed; }
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174
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175 // Return the maximum number of regions in the heap.
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176 uint max_length() const { return (uint)_regions.length(); }
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177
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178 MemRegion committed() const { return MemRegion(heap_bottom(), heap_top()); }
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179
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180 MemRegion reserved() const { return MemRegion(heap_bottom(), heap_end()); }
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181
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182 // Expand the sequence to reflect that the heap has grown. Either create new
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183 // HeapRegions, or re-use existing ones. Returns the number of regions the
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184 // sequence was expanded by. If a HeapRegion allocation fails, the resulting
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185 // number of regions might be smaller than what's desired.
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186 uint expand_by(uint num_regions);
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187
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188 // Makes sure that the regions from start to start+num_regions-1 are available
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189 // for allocation. Returns the number of regions that were committed to achieve
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190 // this.
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191 uint expand_at(uint start, uint num_regions);
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192
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193 // Find a contiguous set of empty or uncommitted regions of length num and return
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194 // the index of the first region or G1_NO_HRS_INDEX if the search was unsuccessful.
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195 // If only_empty is true, only empty regions are considered.
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196 // Searches from bottom to top of the heap, doing a first-fit.
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197 uint find_contiguous(size_t num, bool only_empty);
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198
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199 HeapRegion* next_region_in_heap(const HeapRegion* r) const;
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200
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201 // Apply blk->doHeapRegion() on all committed regions in address order,
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202 // terminating the iteration early if doHeapRegion() returns true.
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203 void iterate(HeapRegionClosure* blk) const;
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204
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205 void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const;
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206
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207 // Uncommit up to num_regions_to_remove regions that are completely free.
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208 // Return the actual number of uncommitted regions.
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209 uint shrink_by(uint num_regions_to_remove);
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210
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211 void verify();
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212
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213 // Do some sanity checking.
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214 void verify_optional() PRODUCT_RETURN;
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215 };
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216
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217 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP