Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegionManager.hpp @ 24170:0b85ccd62409 jdk8u131-b01
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author | coleenp |
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date | Tue, 13 Dec 2016 14:37:04 -0500 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2015, 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 | |
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP |
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP |
1972 | 27 |
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28 #include "gc_implementation/g1/g1BiasedArray.hpp" |
20337 | 29 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
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30 #include "gc_implementation/g1/heapRegionSet.hpp" |
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31 #include "services/memoryUsage.hpp" |
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32 |
342 | 33 class HeapRegion; |
34 class HeapRegionClosure; | |
3766 | 35 class FreeRegionList; |
36 | |
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37 class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> { |
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38 protected: |
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39 virtual HeapRegion* default_value() const { return NULL; } |
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40 }; |
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41 |
20337 | 42 // This class keeps track of the actual heap memory, auxiliary data |
43 // and its metadata (i.e., HeapRegion instances) and the list of free regions. | |
44 // | |
45 // This allows maximum flexibility for deciding what to commit or uncommit given | |
46 // a request from outside. | |
47 // | |
48 // HeapRegions are kept in the _regions array in address order. A region's | |
49 // index in the array corresponds to its index in the heap (i.e., 0 is the | |
50 // region at the bottom of the heap, 1 is the one after it, etc.). Two | |
51 // regions that are consecutive in the array should also be adjacent in the | |
52 // address space (i.e., region(i).end() == region(i+1).bottom(). | |
3766 | 53 // |
54 // We create a HeapRegion when we commit the region's address space | |
55 // for the first time. When we uncommit the address space of a | |
56 // region we retain the HeapRegion to be able to re-use it in the | |
57 // future (in case we recommit it). | |
58 // | |
59 // We keep track of three lengths: | |
60 // | |
20337 | 61 // * _num_committed (returned by length()) is the number of currently |
62 // committed regions. These may not be contiguous. | |
63 // * _allocated_heapregions_length (not exposed outside this class) is the | |
64 // number of regions+1 for which we have HeapRegions. | |
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65 // * max_length() returns the maximum number of regions the heap can have. |
3766 | 66 // |
342 | 67 |
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68 class HeapRegionManager: public CHeapObj<mtGC> { |
3972 | 69 friend class VMStructs; |
342 | 70 |
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71 G1HeapRegionTable _regions; |
3766 | 72 |
20337 | 73 G1RegionToSpaceMapper* _heap_mapper; |
74 G1RegionToSpaceMapper* _prev_bitmap_mapper; | |
75 G1RegionToSpaceMapper* _next_bitmap_mapper; | |
76 G1RegionToSpaceMapper* _bot_mapper; | |
77 G1RegionToSpaceMapper* _cardtable_mapper; | |
78 G1RegionToSpaceMapper* _card_counts_mapper; | |
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79 |
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80 FreeRegionList _free_list; |
3766 | 81 |
20337 | 82 // Each bit in this bitmap indicates that the corresponding region is available |
83 // for allocation. | |
84 BitMap _available_map; | |
85 | |
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86 // The number of regions committed in the heap. |
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87 uint _num_committed; |
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88 |
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89 // Internal only. The highest heap region +1 we allocated a HeapRegion instance for. |
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90 uint _allocated_heapregions_length; |
342 | 91 |
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92 HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); } |
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93 HeapWord* heap_end() const {return _regions.end_address_mapped(); } |
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94 |
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95 void make_regions_available(uint index, uint num_regions = 1); |
3766 | 96 |
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97 // Pass down commit calls to the VirtualSpace. |
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98 void commit_regions(uint index, size_t num_regions = 1); |
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99 void uncommit_regions(uint index, size_t num_regions = 1); |
342 | 100 |
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101 // Notify other data structures about change in the heap layout. |
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102 void update_committed_space(HeapWord* old_end, HeapWord* new_end); |
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103 // Calculate the starting region for each worker during parallel iteration so |
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104 // that they do not all start from the same region. |
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105 uint start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const; |
3766 | 106 |
20337 | 107 // Find a contiguous set of empty or uncommitted regions of length num and return |
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108 // the index of the first region or G1_NO_HRM_INDEX if the search was unsuccessful. |
20337 | 109 // If only_empty is true, only empty regions are considered. |
110 // Searches from bottom to top of the heap, doing a first-fit. | |
111 uint find_contiguous(size_t num, bool only_empty); | |
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112 // Finds the next sequence of unavailable regions starting from start_idx. Returns the |
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113 // length of the sequence found. If this result is zero, no such sequence could be found, |
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114 // otherwise res_idx indicates the start index of these regions. |
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115 uint find_unavailable_from_idx(uint start_idx, uint* res_idx) const; |
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116 // Finds the next sequence of empty regions starting from start_idx, going backwards in |
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117 // the heap. Returns the length of the sequence found. If this value is zero, no |
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118 // sequence could be found, otherwise res_idx contains the start index of this range. |
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119 uint find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const; |
20337 | 120 // Allocate a new HeapRegion for the given index. |
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121 HeapRegion* new_heap_region(uint hrm_index); |
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122 #ifdef ASSERT |
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123 public: |
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124 bool is_free(HeapRegion* hr) const; |
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125 #endif |
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126 // Returns whether the given region is available for allocation. |
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127 bool is_available(uint region) const; |
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128 |
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129 public: |
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130 // Empty constructor, we'll initialize it with the initialize() method. |
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131 HeapRegionManager() : _regions(), _heap_mapper(NULL), _num_committed(0), |
20337 | 132 _next_bitmap_mapper(NULL), _prev_bitmap_mapper(NULL), _bot_mapper(NULL), |
133 _allocated_heapregions_length(0), _available_map(), | |
134 _free_list("Free list", new MasterFreeRegionListMtSafeChecker()) | |
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135 { } |
342 | 136 |
20337 | 137 void initialize(G1RegionToSpaceMapper* heap_storage, |
138 G1RegionToSpaceMapper* prev_bitmap, | |
139 G1RegionToSpaceMapper* next_bitmap, | |
140 G1RegionToSpaceMapper* bot, | |
141 G1RegionToSpaceMapper* cardtable, | |
142 G1RegionToSpaceMapper* card_counts); | |
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143 |
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144 // Return the "dummy" region used for G1AllocRegion. This is currently a hardwired |
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145 // new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit |
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146 // the heap from the lowest address, this region (and its associated data |
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147 // structures) are available and we do not need to check further. |
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148 HeapRegion* get_dummy_region() { return new_heap_region(0); } |
342 | 149 |
3766 | 150 // Return the HeapRegion at the given index. Assume that the index |
151 // is valid. | |
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152 inline HeapRegion* at(uint index) const; |
3766 | 153 |
154 // If addr is within the committed space return its corresponding | |
155 // HeapRegion, otherwise return NULL. | |
156 inline HeapRegion* addr_to_region(HeapWord* addr) const; | |
157 | |
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158 // Insert the given region into the free region list. |
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159 inline void insert_into_free_list(HeapRegion* hr); |
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160 |
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161 // Insert the given region list into the global free region list. |
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162 void insert_list_into_free_list(FreeRegionList* list) { |
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163 _free_list.add_ordered(list); |
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164 } |
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165 |
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166 HeapRegion* allocate_free_region(bool is_old) { |
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167 HeapRegion* hr = _free_list.remove_region(is_old); |
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168 |
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169 if (hr != NULL) { |
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170 assert(hr->next() == NULL, "Single region should not have next"); |
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171 assert(is_available(hr->hrm_index()), "Must be committed"); |
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172 } |
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173 return hr; |
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174 } |
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175 |
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176 inline void allocate_free_regions_starting_at(uint first, uint num_regions); |
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177 |
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178 // Remove all regions from the free list. |
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179 void remove_all_free_regions() { |
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180 _free_list.remove_all(); |
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181 } |
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182 |
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183 // Return the number of committed free regions in the heap. |
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184 uint num_free_regions() const { |
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185 return _free_list.length(); |
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186 } |
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187 |
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188 size_t total_capacity_bytes() const { |
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189 return num_free_regions() * HeapRegion::GrainBytes; |
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190 } |
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191 |
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192 // Return the number of available (uncommitted) regions. |
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193 uint available() const { return max_length() - length(); } |
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194 |
3766 | 195 // Return the number of regions that have been committed in the heap. |
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196 uint length() const { return _num_committed; } |
3766 | 197 |
198 // Return the maximum number of regions in the heap. | |
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199 uint max_length() const { return (uint)_regions.length(); } |
342 | 200 |
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201 MemoryUsage get_auxiliary_data_memory_usage() const; |
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202 |
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203 MemRegion reserved() const { return MemRegion(heap_bottom(), heap_end()); } |
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204 |
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205 // Expand the sequence to reflect that the heap has grown. Either create new |
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206 // HeapRegions, or re-use existing ones. Returns the number of regions the |
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207 // sequence was expanded by. If a HeapRegion allocation fails, the resulting |
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208 // number of regions might be smaller than what's desired. |
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209 uint expand_by(uint num_regions); |
342 | 210 |
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211 // Makes sure that the regions from start to start+num_regions-1 are available |
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212 // for allocation. Returns the number of regions that were committed to achieve |
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213 // this. |
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214 uint expand_at(uint start, uint num_regions); |
342 | 215 |
20337 | 216 // Find a contiguous set of empty regions of length num. Returns the start index of |
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217 // that set, or G1_NO_HRM_INDEX. |
20337 | 218 uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); } |
219 // Find a contiguous set of empty or unavailable regions of length num. Returns the | |
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220 // start index of that set, or G1_NO_HRM_INDEX. |
20337 | 221 uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); } |
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222 |
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223 HeapRegion* next_region_in_heap(const HeapRegion* r) const; |
342 | 224 |
3766 | 225 // Apply blk->doHeapRegion() on all committed regions in address order, |
226 // terminating the iteration early if doHeapRegion() returns true. | |
227 void iterate(HeapRegionClosure* blk) const; | |
342 | 228 |
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229 void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const; |
342 | 230 |
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231 // Uncommit up to num_regions_to_remove regions that are completely free. |
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232 // Return the actual number of uncommitted regions. |
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233 uint shrink_by(uint num_regions_to_remove); |
342 | 234 |
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235 void verify(); |
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236 |
3766 | 237 // Do some sanity checking. |
238 void verify_optional() PRODUCT_RETURN; | |
342 | 239 }; |
1972 | 240 |
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241 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP |