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annotate src/share/vm/gc_implementation/concurrentMarkSweep/binaryTreeDictionary.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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| date | Thu, 27 May 2010 19:08:38 -0700 |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 /* | |
| 26 * A binary tree based search structure for free blocks. | |
| 27 * This is currently used in the Concurrent Mark&Sweep implementation. | |
| 28 */ | |
| 29 | |
| 30 // A TreeList is a FreeList which can be used to maintain a | |
| 31 // binary tree of free lists. | |
| 32 | |
| 33 class TreeChunk; | |
| 34 class BinaryTreeDictionary; | |
| 35 class AscendTreeCensusClosure; | |
| 36 class DescendTreeCensusClosure; | |
| 37 class DescendTreeSearchClosure; | |
| 38 | |
| 39 class TreeList: public FreeList { | |
| 40 friend class TreeChunk; | |
| 41 friend class BinaryTreeDictionary; | |
| 42 friend class AscendTreeCensusClosure; | |
| 43 friend class DescendTreeCensusClosure; | |
| 44 friend class DescendTreeSearchClosure; | |
| 45 | |
| 46 protected: | |
| 47 TreeList* parent() const { return _parent; } | |
| 48 TreeList* left() const { return _left; } | |
| 49 TreeList* right() const { return _right; } | |
| 50 | |
| 51 // Accessors for links in tree. | |
| 52 | |
| 53 void setLeft(TreeList* tl) { | |
| 54 _left = tl; | |
| 55 if (tl != NULL) | |
| 56 tl->setParent(this); | |
| 57 } | |
| 58 void setRight(TreeList* tl) { | |
| 59 _right = tl; | |
| 60 if (tl != NULL) | |
| 61 tl->setParent(this); | |
| 62 } | |
| 63 void setParent(TreeList* tl) { _parent = tl; } | |
| 64 | |
| 65 void clearLeft() { _left = NULL; } | |
| 66 void clearRight() { _right = NULL; } | |
| 67 void clearParent() { _parent = NULL; } | |
| 68 void initialize() { clearLeft(); clearRight(), clearParent(); } | |
| 69 | |
| 70 // For constructing a TreeList from a Tree chunk or | |
| 71 // address and size. | |
| 72 static TreeList* as_TreeList(TreeChunk* tc); | |
| 73 static TreeList* as_TreeList(HeapWord* addr, size_t size); | |
| 74 | |
| 75 // Returns the head of the free list as a pointer to a TreeChunk. | |
| 76 TreeChunk* head_as_TreeChunk(); | |
| 77 | |
| 78 // Returns the first available chunk in the free list as a pointer | |
| 79 // to a TreeChunk. | |
| 80 TreeChunk* first_available(); | |
| 81 | |
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82 // Returns the block with the largest heap address amongst |
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83 // those in the list for this size; potentially slow and expensive, |
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84 // use with caution! |
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85 TreeChunk* largest_address(); |
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86 |
| 0 | 87 // removeChunkReplaceIfNeeded() removes the given "tc" from the TreeList. |
| 88 // If "tc" is the first chunk in the list, it is also the | |
| 89 // TreeList that is the node in the tree. removeChunkReplaceIfNeeded() | |
| 90 // returns the possibly replaced TreeList* for the node in | |
| 91 // the tree. It also updates the parent of the original | |
| 92 // node to point to the new node. | |
| 93 TreeList* removeChunkReplaceIfNeeded(TreeChunk* tc); | |
| 94 // See FreeList. | |
| 95 void returnChunkAtHead(TreeChunk* tc); | |
| 96 void returnChunkAtTail(TreeChunk* tc); | |
| 97 }; | |
| 98 | |
| 99 // A TreeChunk is a subclass of a FreeChunk that additionally | |
| 100 // maintains a pointer to the free list on which it is currently | |
| 101 // linked. | |
| 102 // A TreeChunk is also used as a node in the binary tree. This | |
| 103 // allows the binary tree to be maintained without any additional | |
| 104 // storage (the free chunks are used). In a binary tree the first | |
| 105 // chunk in the free list is also the tree node. Note that the | |
| 106 // TreeChunk has an embedded TreeList for this purpose. Because | |
| 107 // the first chunk in the list is distinguished in this fashion | |
| 108 // (also is the node in the tree), it is the last chunk to be found | |
| 109 // on the free list for a node in the tree and is only removed if | |
| 110 // it is the last chunk on the free list. | |
| 111 | |
| 112 class TreeChunk : public FreeChunk { | |
| 113 friend class TreeList; | |
| 114 TreeList* _list; | |
| 115 TreeList _embedded_list; // if non-null, this chunk is on _list | |
| 116 protected: | |
| 117 TreeList* embedded_list() const { return (TreeList*) &_embedded_list; } | |
| 118 void set_embedded_list(TreeList* v) { _embedded_list = *v; } | |
| 119 public: | |
| 120 TreeList* list() { return _list; } | |
| 121 void set_list(TreeList* v) { _list = v; } | |
| 122 static TreeChunk* as_TreeChunk(FreeChunk* fc); | |
| 123 // Initialize fields in a TreeChunk that should be | |
| 124 // initialized when the TreeChunk is being added to | |
| 125 // a free list in the tree. | |
| 126 void initialize() { embedded_list()->initialize(); } | |
| 127 | |
| 128 // debugging | |
| 129 void verifyTreeChunkList() const; | |
| 130 }; | |
| 131 | |
| 132 const size_t MIN_TREE_CHUNK_SIZE = sizeof(TreeChunk)/HeapWordSize; | |
| 133 | |
| 134 class BinaryTreeDictionary: public FreeBlockDictionary { | |
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135 friend class VMStructs; |
| 0 | 136 bool _splay; |
| 137 size_t _totalSize; | |
| 138 size_t _totalFreeBlocks; | |
| 139 TreeList* _root; | |
| 140 | |
| 141 // private accessors | |
| 142 bool splay() const { return _splay; } | |
| 143 void set_splay(bool v) { _splay = v; } | |
| 144 size_t totalSize() const { return _totalSize; } | |
| 145 void set_totalSize(size_t v) { _totalSize = v; } | |
| 146 virtual void inc_totalSize(size_t v); | |
| 147 virtual void dec_totalSize(size_t v); | |
| 148 size_t totalFreeBlocks() const { return _totalFreeBlocks; } | |
| 149 void set_totalFreeBlocks(size_t v) { _totalFreeBlocks = v; } | |
| 150 TreeList* root() const { return _root; } | |
| 151 void set_root(TreeList* v) { _root = v; } | |
| 152 | |
| 153 // Remove a chunk of size "size" or larger from the tree and | |
| 154 // return it. If the chunk | |
| 155 // is the last chunk of that size, remove the node for that size | |
| 156 // from the tree. | |
| 157 TreeChunk* getChunkFromTree(size_t size, Dither dither, bool splay); | |
| 158 // Return a list of the specified size or NULL from the tree. | |
| 159 // The list is not removed from the tree. | |
| 160 TreeList* findList (size_t size) const; | |
| 161 // Remove this chunk from the tree. If the removal results | |
| 162 // in an empty list in the tree, remove the empty list. | |
| 163 TreeChunk* removeChunkFromTree(TreeChunk* tc); | |
| 164 // Remove the node in the trees starting at tl that has the | |
| 165 // minimum value and return it. Repair the tree as needed. | |
| 166 TreeList* removeTreeMinimum(TreeList* tl); | |
| 167 void semiSplayStep(TreeList* tl); | |
| 168 // Add this free chunk to the tree. | |
| 169 void insertChunkInTree(FreeChunk* freeChunk); | |
| 170 public: | |
| 171 void verifyTree() const; | |
| 172 // verify that the given chunk is in the tree. | |
| 173 bool verifyChunkInFreeLists(FreeChunk* tc) const; | |
| 174 private: | |
| 175 void verifyTreeHelper(TreeList* tl) const; | |
| 176 static size_t verifyPrevFreePtrs(TreeList* tl); | |
| 177 | |
| 178 // Returns the total number of chunks in the list. | |
| 179 size_t totalListLength(TreeList* tl) const; | |
| 180 // Returns the total number of words in the chunks in the tree | |
| 181 // starting at "tl". | |
| 182 size_t totalSizeInTree(TreeList* tl) const; | |
| 183 // Returns the sum of the square of the size of each block | |
| 184 // in the tree starting at "tl". | |
| 185 double sum_of_squared_block_sizes(TreeList* const tl) const; | |
| 186 // Returns the total number of free blocks in the tree starting | |
| 187 // at "tl". | |
| 188 size_t totalFreeBlocksInTree(TreeList* tl) const; | |
| 189 size_t numFreeBlocks() const; | |
| 190 size_t treeHeight() const; | |
| 191 size_t treeHeightHelper(TreeList* tl) const; | |
| 192 size_t totalNodesInTree(TreeList* tl) const; | |
| 193 size_t totalNodesHelper(TreeList* tl) const; | |
| 194 | |
| 195 public: | |
| 196 // Constructor | |
| 197 BinaryTreeDictionary(MemRegion mr, bool splay = false); | |
| 198 | |
| 199 // Reset the dictionary to the initial conditions with | |
| 200 // a single free chunk. | |
| 201 void reset(MemRegion mr); | |
| 202 void reset(HeapWord* addr, size_t size); | |
| 203 // Reset the dictionary to be empty. | |
| 204 void reset(); | |
| 205 | |
| 206 // Return a chunk of size "size" or greater from | |
| 207 // the tree. | |
| 208 // want a better dynamic splay strategy for the future. | |
| 209 FreeChunk* getChunk(size_t size, Dither dither) { | |
| 210 verify_par_locked(); | |
| 211 FreeChunk* res = getChunkFromTree(size, dither, splay()); | |
| 212 assert(res == NULL || res->isFree(), | |
| 213 "Should be returning a free chunk"); | |
| 214 return res; | |
| 215 } | |
| 216 | |
| 217 void returnChunk(FreeChunk* chunk) { | |
| 218 verify_par_locked(); | |
| 219 insertChunkInTree(chunk); | |
| 220 } | |
| 221 | |
| 222 void removeChunk(FreeChunk* chunk) { | |
| 223 verify_par_locked(); | |
| 224 removeChunkFromTree((TreeChunk*)chunk); | |
| 225 assert(chunk->isFree(), "Should still be a free chunk"); | |
| 226 } | |
| 227 | |
| 228 size_t maxChunkSize() const; | |
| 229 size_t totalChunkSize(debug_only(const Mutex* lock)) const { | |
| 230 debug_only( | |
| 231 if (lock != NULL && lock->owned_by_self()) { | |
| 232 assert(totalSizeInTree(root()) == totalSize(), | |
| 233 "_totalSize inconsistency"); | |
| 234 } | |
| 235 ) | |
| 236 return totalSize(); | |
| 237 } | |
| 238 | |
| 239 size_t minSize() const { | |
| 240 return MIN_TREE_CHUNK_SIZE; | |
| 241 } | |
| 242 | |
| 243 double sum_of_squared_block_sizes() const { | |
| 244 return sum_of_squared_block_sizes(root()); | |
| 245 } | |
| 246 | |
| 247 FreeChunk* find_chunk_ends_at(HeapWord* target) const; | |
| 248 | |
| 249 // Find the list with size "size" in the binary tree and update | |
| 250 // the statistics in the list according to "split" (chunk was | |
| 251 // split or coalesce) and "birth" (chunk was added or removed). | |
| 252 void dictCensusUpdate(size_t size, bool split, bool birth); | |
| 253 // Return true if the dictionary is overpopulated (more chunks of | |
| 254 // this size than desired) for size "size". | |
| 255 bool coalDictOverPopulated(size_t size); | |
| 256 // Methods called at the beginning of a sweep to prepare the | |
| 257 // statistics for the sweep. | |
| 258 void beginSweepDictCensus(double coalSurplusPercent, | |
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259 float inter_sweep_current, |
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260 float inter_sweep_estimate, |
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261 float intra_sweep_estimate); |
| 0 | 262 // Methods called after the end of a sweep to modify the |
| 263 // statistics for the sweep. | |
| 264 void endSweepDictCensus(double splitSurplusPercent); | |
| 265 // Return the largest free chunk in the tree. | |
| 266 FreeChunk* findLargestDict() const; | |
| 267 // Accessors for statistics | |
| 268 void setTreeSurplus(double splitSurplusPercent); | |
| 269 void setTreeHints(void); | |
| 270 // Reset statistics for all the lists in the tree. | |
| 271 void clearTreeCensus(void); | |
| 272 // Print the statistcis for all the lists in the tree. Also may | |
| 273 // print out summaries. | |
| 274 void printDictCensus(void) const; | |
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275 void print_free_lists(outputStream* st) const; |
| 0 | 276 |
| 277 // For debugging. Returns the sum of the _returnedBytes for | |
| 278 // all lists in the tree. | |
| 279 size_t sumDictReturnedBytes() PRODUCT_RETURN0; | |
| 280 // Sets the _returnedBytes for all the lists in the tree to zero. | |
| 281 void initializeDictReturnedBytes() PRODUCT_RETURN; | |
| 282 // For debugging. Return the total number of chunks in the dictionary. | |
| 283 size_t totalCount() PRODUCT_RETURN0; | |
| 284 | |
| 285 void reportStatistics() const; | |
| 286 | |
| 287 void verify() const; | |
| 288 }; |