Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/binaryTreeDictionary.hpp @ 1286:ab75c83d7c37
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author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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 }; |