Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 20336:6701abbc4441
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 |
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date | Tue, 19 Aug 2014 10:50:27 +0200 |
parents | eec72fa4b108 |
children | 1f1d373cd044 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP | |
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 |
342 | 31 class HeapRegion; |
32 class HeapRegionClosure; | |
3766 | 33 class FreeRegionList; |
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 |
3766 | 40 // This class keeps track of the region metadata (i.e., HeapRegion |
41 // instances). They are kept in the _regions array in address | |
42 // order. A region's index in the array corresponds to its index in | |
43 // the heap (i.e., 0 is the region at the bottom of the heap, 1 is | |
44 // the one after it, etc.). Two regions that are consecutive in the | |
45 // array should also be adjacent in the address space (i.e., | |
46 // region(i).end() == region(i+1).bottom(). | |
47 // | |
48 // We create a HeapRegion when we commit the region's address space | |
49 // for the first time. When we uncommit the address space of a | |
50 // region we retain the HeapRegion to be able to re-use it in the | |
51 // future (in case we recommit it). | |
52 // | |
53 // We keep track of three lengths: | |
54 // | |
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55 // * _committed_length (returned by length()) is the number of currently |
3766 | 56 // committed regions. |
57 // * _allocated_length (not exposed outside this class) is the | |
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. |
3766 | 60 // |
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61 // and maintain that: _committed_length <= _allocated_length <= max_length() |
342 | 62 |
6197 | 63 class HeapRegionSeq: public CHeapObj<mtGC> { |
3972 | 64 friend class VMStructs; |
342 | 65 |
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66 G1HeapRegionTable _regions; |
3766 | 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; |
3766 | 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; |
342 | 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); |
3766 | 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); |
342 | 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; |
3766 | 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 { } |
342 | 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); } |
342 | 126 |
3766 | 127 // Return the HeapRegion at the given index. Assume that the index |
128 // is valid. | |
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129 inline HeapRegion* at(uint index) const; |
3766 | 130 |
131 // If addr is within the committed space return its corresponding | |
132 // HeapRegion, otherwise return NULL. | |
133 inline HeapRegion* addr_to_region(HeapWord* addr) const; | |
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 |
3766 | 172 // Return the number of regions that have been committed in the heap. |
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173 uint length() const { return _num_committed; } |
3766 | 174 |
175 // Return the maximum number of regions in the heap. | |
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176 uint max_length() const { return (uint)_regions.length(); } |
342 | 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); |
342 | 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); |
342 | 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; |
342 | 200 |
3766 | 201 // Apply blk->doHeapRegion() on all committed regions in address order, |
202 // terminating the iteration early if doHeapRegion() returns true. | |
203 void iterate(HeapRegionClosure* blk) const; | |
342 | 204 |
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205 void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const; |
342 | 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); |
342 | 210 |
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211 void verify(); |
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212 |
3766 | 213 // Do some sanity checking. |
214 void verify_optional() PRODUCT_RETURN; | |
342 | 215 }; |
1972 | 216 |
217 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |