Mercurial > hg > truffle
comparison src/share/vm/memory/binaryTreeDictionary.hpp @ 6157:84e198dc2474
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author | asaha |
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date | Mon, 21 May 2012 14:56:33 -0700 |
parents | f69a5d43dc19 |
children | a297b0e14605 |
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6156:6d2c830e025d | 6157:84e198dc2474 |
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1 /* | |
2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. | |
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_MEMORY_BINARYTREEDICTIONARY_HPP | |
26 #define SHARE_VM_MEMORY_BINARYTREEDICTIONARY_HPP | |
27 | |
28 #include "memory/freeBlockDictionary.hpp" | |
29 #include "memory/freeList.hpp" | |
30 | |
31 /* | |
32 * A binary tree based search structure for free blocks. | |
33 * This is currently used in the Concurrent Mark&Sweep implementation, but | |
34 * will be used for free block management for metadata. | |
35 */ | |
36 | |
37 // A TreeList is a FreeList which can be used to maintain a | |
38 // binary tree of free lists. | |
39 | |
40 template <class Chunk> class TreeChunk; | |
41 template <class Chunk> class BinaryTreeDictionary; | |
42 template <class Chunk> class AscendTreeCensusClosure; | |
43 template <class Chunk> class DescendTreeCensusClosure; | |
44 template <class Chunk> class DescendTreeSearchClosure; | |
45 | |
46 template <class Chunk> | |
47 class TreeList: public FreeList<Chunk> { | |
48 friend class TreeChunk<Chunk>; | |
49 friend class BinaryTreeDictionary<Chunk>; | |
50 friend class AscendTreeCensusClosure<Chunk>; | |
51 friend class DescendTreeCensusClosure<Chunk>; | |
52 friend class DescendTreeSearchClosure<Chunk>; | |
53 | |
54 TreeList<Chunk>* _parent; | |
55 TreeList<Chunk>* _left; | |
56 TreeList<Chunk>* _right; | |
57 | |
58 protected: | |
59 TreeList<Chunk>* parent() const { return _parent; } | |
60 TreeList<Chunk>* left() const { return _left; } | |
61 TreeList<Chunk>* right() const { return _right; } | |
62 | |
63 // Wrapper on call to base class, to get the template to compile. | |
64 Chunk* head() const { return FreeList<Chunk>::head(); } | |
65 Chunk* tail() const { return FreeList<Chunk>::tail(); } | |
66 void set_head(Chunk* head) { FreeList<Chunk>::set_head(head); } | |
67 void set_tail(Chunk* tail) { FreeList<Chunk>::set_tail(tail); } | |
68 | |
69 size_t size() const { return FreeList<Chunk>::size(); } | |
70 | |
71 // Accessors for links in tree. | |
72 | |
73 void set_left(TreeList<Chunk>* tl) { | |
74 _left = tl; | |
75 if (tl != NULL) | |
76 tl->set_parent(this); | |
77 } | |
78 void set_right(TreeList<Chunk>* tl) { | |
79 _right = tl; | |
80 if (tl != NULL) | |
81 tl->set_parent(this); | |
82 } | |
83 void set_parent(TreeList<Chunk>* tl) { _parent = tl; } | |
84 | |
85 void clearLeft() { _left = NULL; } | |
86 void clear_right() { _right = NULL; } | |
87 void clear_parent() { _parent = NULL; } | |
88 void initialize() { clearLeft(); clear_right(), clear_parent(); } | |
89 | |
90 // For constructing a TreeList from a Tree chunk or | |
91 // address and size. | |
92 static TreeList<Chunk>* as_TreeList(TreeChunk<Chunk>* tc); | |
93 static TreeList<Chunk>* as_TreeList(HeapWord* addr, size_t size); | |
94 | |
95 // Returns the head of the free list as a pointer to a TreeChunk. | |
96 TreeChunk<Chunk>* head_as_TreeChunk(); | |
97 | |
98 // Returns the first available chunk in the free list as a pointer | |
99 // to a TreeChunk. | |
100 TreeChunk<Chunk>* first_available(); | |
101 | |
102 // Returns the block with the largest heap address amongst | |
103 // those in the list for this size; potentially slow and expensive, | |
104 // use with caution! | |
105 TreeChunk<Chunk>* largest_address(); | |
106 | |
107 // remove_chunk_replace_if_needed() removes the given "tc" from the TreeList. | |
108 // If "tc" is the first chunk in the list, it is also the | |
109 // TreeList that is the node in the tree. remove_chunk_replace_if_needed() | |
110 // returns the possibly replaced TreeList* for the node in | |
111 // the tree. It also updates the parent of the original | |
112 // node to point to the new node. | |
113 TreeList<Chunk>* remove_chunk_replace_if_needed(TreeChunk<Chunk>* tc); | |
114 // See FreeList. | |
115 void return_chunk_at_head(TreeChunk<Chunk>* tc); | |
116 void return_chunk_at_tail(TreeChunk<Chunk>* tc); | |
117 }; | |
118 | |
119 // A TreeChunk is a subclass of a Chunk that additionally | |
120 // maintains a pointer to the free list on which it is currently | |
121 // linked. | |
122 // A TreeChunk is also used as a node in the binary tree. This | |
123 // allows the binary tree to be maintained without any additional | |
124 // storage (the free chunks are used). In a binary tree the first | |
125 // chunk in the free list is also the tree node. Note that the | |
126 // TreeChunk has an embedded TreeList for this purpose. Because | |
127 // the first chunk in the list is distinguished in this fashion | |
128 // (also is the node in the tree), it is the last chunk to be found | |
129 // on the free list for a node in the tree and is only removed if | |
130 // it is the last chunk on the free list. | |
131 | |
132 template <class Chunk> | |
133 class TreeChunk : public Chunk { | |
134 friend class TreeList<Chunk>; | |
135 TreeList<Chunk>* _list; | |
136 TreeList<Chunk> _embedded_list; // if non-null, this chunk is on _list | |
137 protected: | |
138 TreeList<Chunk>* embedded_list() const { return (TreeList<Chunk>*) &_embedded_list; } | |
139 void set_embedded_list(TreeList<Chunk>* v) { _embedded_list = *v; } | |
140 public: | |
141 TreeList<Chunk>* list() { return _list; } | |
142 void set_list(TreeList<Chunk>* v) { _list = v; } | |
143 static TreeChunk<Chunk>* as_TreeChunk(Chunk* fc); | |
144 // Initialize fields in a TreeChunk that should be | |
145 // initialized when the TreeChunk is being added to | |
146 // a free list in the tree. | |
147 void initialize() { embedded_list()->initialize(); } | |
148 | |
149 Chunk* next() const { return Chunk::next(); } | |
150 Chunk* prev() const { return Chunk::prev(); } | |
151 size_t size() const volatile { return Chunk::size(); } | |
152 | |
153 // debugging | |
154 void verify_tree_chunk_list() const; | |
155 }; | |
156 | |
157 | |
158 template <class Chunk> | |
159 class BinaryTreeDictionary: public FreeBlockDictionary<Chunk> { | |
160 friend class VMStructs; | |
161 bool _splay; | |
162 size_t _total_size; | |
163 size_t _total_free_blocks; | |
164 TreeList<Chunk>* _root; | |
165 bool _adaptive_freelists; | |
166 | |
167 // private accessors | |
168 bool splay() const { return _splay; } | |
169 void set_splay(bool v) { _splay = v; } | |
170 void set_total_size(size_t v) { _total_size = v; } | |
171 virtual void inc_total_size(size_t v); | |
172 virtual void dec_total_size(size_t v); | |
173 size_t total_free_blocks() const { return _total_free_blocks; } | |
174 void set_total_free_blocks(size_t v) { _total_free_blocks = v; } | |
175 TreeList<Chunk>* root() const { return _root; } | |
176 void set_root(TreeList<Chunk>* v) { _root = v; } | |
177 bool adaptive_freelists() { return _adaptive_freelists; } | |
178 | |
179 // This field is added and can be set to point to the | |
180 // the Mutex used to synchronize access to the | |
181 // dictionary so that assertion checking can be done. | |
182 // For example it is set to point to _parDictionaryAllocLock. | |
183 NOT_PRODUCT(Mutex* _lock;) | |
184 | |
185 // Remove a chunk of size "size" or larger from the tree and | |
186 // return it. If the chunk | |
187 // is the last chunk of that size, remove the node for that size | |
188 // from the tree. | |
189 TreeChunk<Chunk>* get_chunk_from_tree(size_t size, enum FreeBlockDictionary<Chunk>::Dither dither, bool splay); | |
190 // Return a list of the specified size or NULL from the tree. | |
191 // The list is not removed from the tree. | |
192 TreeList<Chunk>* find_list (size_t size) const; | |
193 // Remove this chunk from the tree. If the removal results | |
194 // in an empty list in the tree, remove the empty list. | |
195 TreeChunk<Chunk>* remove_chunk_from_tree(TreeChunk<Chunk>* tc); | |
196 // Remove the node in the trees starting at tl that has the | |
197 // minimum value and return it. Repair the tree as needed. | |
198 TreeList<Chunk>* remove_tree_minimum(TreeList<Chunk>* tl); | |
199 void semi_splay_step(TreeList<Chunk>* tl); | |
200 // Add this free chunk to the tree. | |
201 void insert_chunk_in_tree(Chunk* freeChunk); | |
202 public: | |
203 | |
204 static const size_t min_tree_chunk_size = sizeof(TreeChunk<Chunk>)/HeapWordSize; | |
205 | |
206 void verify_tree() const; | |
207 // verify that the given chunk is in the tree. | |
208 bool verify_chunk_in_free_list(Chunk* tc) const; | |
209 private: | |
210 void verify_tree_helper(TreeList<Chunk>* tl) const; | |
211 static size_t verify_prev_free_ptrs(TreeList<Chunk>* tl); | |
212 | |
213 // Returns the total number of chunks in the list. | |
214 size_t total_list_length(TreeList<Chunk>* tl) const; | |
215 // Returns the total number of words in the chunks in the tree | |
216 // starting at "tl". | |
217 size_t total_size_in_tree(TreeList<Chunk>* tl) const; | |
218 // Returns the sum of the square of the size of each block | |
219 // in the tree starting at "tl". | |
220 double sum_of_squared_block_sizes(TreeList<Chunk>* const tl) const; | |
221 // Returns the total number of free blocks in the tree starting | |
222 // at "tl". | |
223 size_t total_free_blocks_in_tree(TreeList<Chunk>* tl) const; | |
224 size_t num_free_blocks() const; | |
225 size_t treeHeight() const; | |
226 size_t tree_height_helper(TreeList<Chunk>* tl) const; | |
227 size_t total_nodes_in_tree(TreeList<Chunk>* tl) const; | |
228 size_t total_nodes_helper(TreeList<Chunk>* tl) const; | |
229 | |
230 public: | |
231 // Constructor | |
232 BinaryTreeDictionary(bool adaptive_freelists, bool splay = false); | |
233 BinaryTreeDictionary(MemRegion mr, bool adaptive_freelists, bool splay = false); | |
234 | |
235 // Public accessors | |
236 size_t total_size() const { return _total_size; } | |
237 | |
238 // Reset the dictionary to the initial conditions with | |
239 // a single free chunk. | |
240 void reset(MemRegion mr); | |
241 void reset(HeapWord* addr, size_t size); | |
242 // Reset the dictionary to be empty. | |
243 void reset(); | |
244 | |
245 // Return a chunk of size "size" or greater from | |
246 // the tree. | |
247 // want a better dynamic splay strategy for the future. | |
248 Chunk* get_chunk(size_t size, enum FreeBlockDictionary<Chunk>::Dither dither) { | |
249 FreeBlockDictionary<Chunk>::verify_par_locked(); | |
250 Chunk* res = get_chunk_from_tree(size, dither, splay()); | |
251 assert(res == NULL || res->is_free(), | |
252 "Should be returning a free chunk"); | |
253 return res; | |
254 } | |
255 | |
256 void return_chunk(Chunk* chunk) { | |
257 FreeBlockDictionary<Chunk>::verify_par_locked(); | |
258 insert_chunk_in_tree(chunk); | |
259 } | |
260 | |
261 void remove_chunk(Chunk* chunk) { | |
262 FreeBlockDictionary<Chunk>::verify_par_locked(); | |
263 remove_chunk_from_tree((TreeChunk<Chunk>*)chunk); | |
264 assert(chunk->is_free(), "Should still be a free chunk"); | |
265 } | |
266 | |
267 size_t max_chunk_size() const; | |
268 size_t total_chunk_size(debug_only(const Mutex* lock)) const { | |
269 debug_only( | |
270 if (lock != NULL && lock->owned_by_self()) { | |
271 assert(total_size_in_tree(root()) == total_size(), | |
272 "_total_size inconsistency"); | |
273 } | |
274 ) | |
275 return total_size(); | |
276 } | |
277 | |
278 size_t min_size() const { | |
279 return min_tree_chunk_size; | |
280 } | |
281 | |
282 double sum_of_squared_block_sizes() const { | |
283 return sum_of_squared_block_sizes(root()); | |
284 } | |
285 | |
286 Chunk* find_chunk_ends_at(HeapWord* target) const; | |
287 | |
288 // Find the list with size "size" in the binary tree and update | |
289 // the statistics in the list according to "split" (chunk was | |
290 // split or coalesce) and "birth" (chunk was added or removed). | |
291 void dict_census_udpate(size_t size, bool split, bool birth); | |
292 // Return true if the dictionary is overpopulated (more chunks of | |
293 // this size than desired) for size "size". | |
294 bool coal_dict_over_populated(size_t size); | |
295 // Methods called at the beginning of a sweep to prepare the | |
296 // statistics for the sweep. | |
297 void begin_sweep_dict_census(double coalSurplusPercent, | |
298 float inter_sweep_current, | |
299 float inter_sweep_estimate, | |
300 float intra_sweep_estimate); | |
301 // Methods called after the end of a sweep to modify the | |
302 // statistics for the sweep. | |
303 void end_sweep_dict_census(double splitSurplusPercent); | |
304 // Return the largest free chunk in the tree. | |
305 Chunk* find_largest_dict() const; | |
306 // Accessors for statistics | |
307 void set_tree_surplus(double splitSurplusPercent); | |
308 void set_tree_hints(void); | |
309 // Reset statistics for all the lists in the tree. | |
310 void clear_tree_census(void); | |
311 // Print the statistcis for all the lists in the tree. Also may | |
312 // print out summaries. | |
313 void print_dict_census(void) const; | |
314 void print_free_lists(outputStream* st) const; | |
315 | |
316 // For debugging. Returns the sum of the _returned_bytes for | |
317 // all lists in the tree. | |
318 size_t sum_dict_returned_bytes() PRODUCT_RETURN0; | |
319 // Sets the _returned_bytes for all the lists in the tree to zero. | |
320 void initialize_dict_returned_bytes() PRODUCT_RETURN; | |
321 // For debugging. Return the total number of chunks in the dictionary. | |
322 size_t total_count() PRODUCT_RETURN0; | |
323 | |
324 void report_statistics() const; | |
325 | |
326 void verify() const; | |
327 }; | |
328 | |
329 #endif // SHARE_VM_MEMORY_BINARYTREEDICTIONARY_HPP |