Mercurial > hg > truffle
annotate src/share/vm/memory/binaryTreeDictionary.cpp @ 6147:5ba29a1db46e hs24-b14
Merge
author | amurillo |
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date | Fri, 15 Jun 2012 14:07:00 -0700 |
parents | a297b0e14605 |
children | 685df3c6f84b |
rev | line source |
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0 | 1 /* |
6026 | 2 * Copyright (c) 2001, 2012, 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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/allocationStats.hpp" | |
6026 | 27 #include "memory/binaryTreeDictionary.hpp" |
1972 | 28 #include "runtime/globals.hpp" |
29 #include "utilities/ostream.hpp" | |
6026 | 30 #ifndef SERIALGC |
31 #include "gc_implementation/shared/spaceDecorator.hpp" | |
32 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" | |
33 #endif // SERIALGC | |
0 | 34 |
35 //////////////////////////////////////////////////////////////////////////////// | |
36 // A binary tree based search structure for free blocks. | |
37 // This is currently used in the Concurrent Mark&Sweep implementation. | |
38 //////////////////////////////////////////////////////////////////////////////// | |
39 | |
6026 | 40 template <class Chunk> |
41 TreeChunk<Chunk>* TreeChunk<Chunk>::as_TreeChunk(Chunk* fc) { | |
0 | 42 // Do some assertion checking here. |
6026 | 43 return (TreeChunk<Chunk>*) fc; |
0 | 44 } |
45 | |
6026 | 46 template <class Chunk> |
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47 void TreeChunk<Chunk>::verify_tree_chunk_list() const { |
6026 | 48 TreeChunk<Chunk>* nextTC = (TreeChunk<Chunk>*)next(); |
0 | 49 if (prev() != NULL) { // interior list node shouldn'r have tree fields |
50 guarantee(embedded_list()->parent() == NULL && embedded_list()->left() == NULL && | |
51 embedded_list()->right() == NULL, "should be clear"); | |
52 } | |
53 if (nextTC != NULL) { | |
54 guarantee(as_TreeChunk(nextTC->prev()) == this, "broken chain"); | |
55 guarantee(nextTC->size() == size(), "wrong size"); | |
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56 nextTC->verify_tree_chunk_list(); |
0 | 57 } |
58 } | |
59 | |
60 | |
6026 | 61 template <class Chunk> |
62 TreeList<Chunk>* TreeList<Chunk>::as_TreeList(TreeChunk<Chunk>* tc) { | |
0 | 63 // This first free chunk in the list will be the tree list. |
6026 | 64 assert(tc->size() >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "Chunk is too small for a TreeChunk"); |
65 TreeList<Chunk>* tl = tc->embedded_list(); | |
0 | 66 tc->set_list(tl); |
67 #ifdef ASSERT | |
68 tl->set_protecting_lock(NULL); | |
69 #endif | |
70 tl->set_hint(0); | |
71 tl->set_size(tc->size()); | |
72 tl->link_head(tc); | |
73 tl->link_tail(tc); | |
74 tl->set_count(1); | |
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75 tl->init_statistics(true /* split_birth */); |
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76 tl->set_parent(NULL); |
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77 tl->set_left(NULL); |
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78 tl->set_right(NULL); |
0 | 79 return tl; |
80 } | |
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81 |
6026 | 82 template <class Chunk> |
83 TreeList<Chunk>* TreeList<Chunk>::as_TreeList(HeapWord* addr, size_t size) { | |
84 TreeChunk<Chunk>* tc = (TreeChunk<Chunk>*) addr; | |
85 assert(size >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "Chunk is too small for a TreeChunk"); | |
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86 // The space in the heap will have been mangled initially but |
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87 // is not remangled when a free chunk is returned to the free list |
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88 // (since it is used to maintain the chunk on the free list). |
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89 assert((ZapUnusedHeapArea && |
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90 SpaceMangler::is_mangled((HeapWord*) tc->size_addr()) && |
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91 SpaceMangler::is_mangled((HeapWord*) tc->prev_addr()) && |
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92 SpaceMangler::is_mangled((HeapWord*) tc->next_addr())) || |
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93 (tc->size() == 0 && tc->prev() == NULL && tc->next() == NULL), |
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94 "Space should be clear or mangled"); |
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95 tc->set_size(size); |
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96 tc->link_prev(NULL); |
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97 tc->link_next(NULL); |
6026 | 98 TreeList<Chunk>* tl = TreeList<Chunk>::as_TreeList(tc); |
0 | 99 return tl; |
100 } | |
101 | |
6026 | 102 template <class Chunk> |
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103 TreeList<Chunk>* TreeList<Chunk>::remove_chunk_replace_if_needed(TreeChunk<Chunk>* tc) { |
0 | 104 |
6026 | 105 TreeList<Chunk>* retTL = this; |
106 Chunk* list = head(); | |
0 | 107 assert(!list || list != list->next(), "Chunk on list twice"); |
108 assert(tc != NULL, "Chunk being removed is NULL"); | |
109 assert(parent() == NULL || this == parent()->left() || | |
110 this == parent()->right(), "list is inconsistent"); | |
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111 assert(tc->is_free(), "Header is not marked correctly"); |
0 | 112 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
113 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
114 | |
6026 | 115 Chunk* prevFC = tc->prev(); |
116 TreeChunk<Chunk>* nextTC = TreeChunk<Chunk>::as_TreeChunk(tc->next()); | |
0 | 117 assert(list != NULL, "should have at least the target chunk"); |
118 | |
119 // Is this the first item on the list? | |
120 if (tc == list) { | |
6026 | 121 // The "getChunk..." functions for a TreeList<Chunk> will not return the |
0 | 122 // first chunk in the list unless it is the last chunk in the list |
123 // because the first chunk is also acting as the tree node. | |
124 // When coalescing happens, however, the first chunk in the a tree | |
125 // list can be the start of a free range. Free ranges are removed | |
126 // from the free lists so that they are not available to be | |
127 // allocated when the sweeper yields (giving up the free list lock) | |
128 // to allow mutator activity. If this chunk is the first in the | |
129 // list and is not the last in the list, do the work to copy the | |
6026 | 130 // TreeList<Chunk> from the first chunk to the next chunk and update all |
131 // the TreeList<Chunk> pointers in the chunks in the list. | |
0 | 132 if (nextTC == NULL) { |
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133 assert(prevFC == NULL, "Not last chunk in the list"); |
0 | 134 set_tail(NULL); |
135 set_head(NULL); | |
136 } else { | |
137 // copy embedded list. | |
138 nextTC->set_embedded_list(tc->embedded_list()); | |
139 retTL = nextTC->embedded_list(); | |
140 // Fix the pointer to the list in each chunk in the list. | |
141 // This can be slow for a long list. Consider having | |
142 // an option that does not allow the first chunk on the | |
143 // list to be coalesced. | |
6026 | 144 for (TreeChunk<Chunk>* curTC = nextTC; curTC != NULL; |
145 curTC = TreeChunk<Chunk>::as_TreeChunk(curTC->next())) { | |
0 | 146 curTC->set_list(retTL); |
147 } | |
6026 | 148 // Fix the parent to point to the new TreeList<Chunk>. |
0 | 149 if (retTL->parent() != NULL) { |
150 if (this == retTL->parent()->left()) { | |
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151 retTL->parent()->set_left(retTL); |
0 | 152 } else { |
153 assert(this == retTL->parent()->right(), "Parent is incorrect"); | |
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154 retTL->parent()->set_right(retTL); |
0 | 155 } |
156 } | |
157 // Fix the children's parent pointers to point to the | |
158 // new list. | |
159 assert(right() == retTL->right(), "Should have been copied"); | |
160 if (retTL->right() != NULL) { | |
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161 retTL->right()->set_parent(retTL); |
0 | 162 } |
163 assert(left() == retTL->left(), "Should have been copied"); | |
164 if (retTL->left() != NULL) { | |
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165 retTL->left()->set_parent(retTL); |
0 | 166 } |
167 retTL->link_head(nextTC); | |
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168 assert(nextTC->is_free(), "Should be a free chunk"); |
0 | 169 } |
170 } else { | |
171 if (nextTC == NULL) { | |
172 // Removing chunk at tail of list | |
173 link_tail(prevFC); | |
174 } | |
175 // Chunk is interior to the list | |
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176 prevFC->link_after(nextTC); |
0 | 177 } |
178 | |
6026 | 179 // Below this point the embeded TreeList<Chunk> being used for the |
0 | 180 // tree node may have changed. Don't use "this" |
6026 | 181 // TreeList<Chunk>*. |
0 | 182 // chunk should still be a free chunk (bit set in _prev) |
183 assert(!retTL->head() || retTL->size() == retTL->head()->size(), | |
184 "Wrong sized chunk in list"); | |
185 debug_only( | |
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186 tc->link_prev(NULL); |
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187 tc->link_next(NULL); |
0 | 188 tc->set_list(NULL); |
189 bool prev_found = false; | |
190 bool next_found = false; | |
6026 | 191 for (Chunk* curFC = retTL->head(); |
0 | 192 curFC != NULL; curFC = curFC->next()) { |
193 assert(curFC != tc, "Chunk is still in list"); | |
194 if (curFC == prevFC) { | |
195 prev_found = true; | |
196 } | |
197 if (curFC == nextTC) { | |
198 next_found = true; | |
199 } | |
200 } | |
201 assert(prevFC == NULL || prev_found, "Chunk was lost from list"); | |
202 assert(nextTC == NULL || next_found, "Chunk was lost from list"); | |
203 assert(retTL->parent() == NULL || | |
204 retTL == retTL->parent()->left() || | |
205 retTL == retTL->parent()->right(), | |
206 "list is inconsistent"); | |
207 ) | |
208 retTL->decrement_count(); | |
209 | |
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210 assert(tc->is_free(), "Should still be a free chunk"); |
0 | 211 assert(retTL->head() == NULL || retTL->head()->prev() == NULL, |
212 "list invariant"); | |
213 assert(retTL->tail() == NULL || retTL->tail()->next() == NULL, | |
214 "list invariant"); | |
215 return retTL; | |
216 } | |
6026 | 217 |
218 template <class Chunk> | |
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219 void TreeList<Chunk>::return_chunk_at_tail(TreeChunk<Chunk>* chunk) { |
0 | 220 assert(chunk != NULL, "returning NULL chunk"); |
221 assert(chunk->list() == this, "list should be set for chunk"); | |
222 assert(tail() != NULL, "The tree list is embedded in the first chunk"); | |
223 // which means that the list can never be empty. | |
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224 assert(!verify_chunk_in_free_list(chunk), "Double entry"); |
0 | 225 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
226 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
227 | |
6026 | 228 Chunk* fc = tail(); |
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229 fc->link_after(chunk); |
0 | 230 link_tail(chunk); |
231 | |
232 assert(!tail() || size() == tail()->size(), "Wrong sized chunk in list"); | |
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233 increment_count(); |
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234 debug_only(increment_returned_bytes_by(chunk->size()*sizeof(HeapWord));) |
0 | 235 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
236 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
237 } | |
238 | |
239 // Add this chunk at the head of the list. "At the head of the list" | |
240 // is defined to be after the chunk pointer to by head(). This is | |
6026 | 241 // because the TreeList<Chunk> is embedded in the first TreeChunk<Chunk> in the |
242 // list. See the definition of TreeChunk<Chunk>. | |
243 template <class Chunk> | |
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244 void TreeList<Chunk>::return_chunk_at_head(TreeChunk<Chunk>* chunk) { |
0 | 245 assert(chunk->list() == this, "list should be set for chunk"); |
246 assert(head() != NULL, "The tree list is embedded in the first chunk"); | |
247 assert(chunk != NULL, "returning NULL chunk"); | |
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248 assert(!verify_chunk_in_free_list(chunk), "Double entry"); |
0 | 249 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
250 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
251 | |
6026 | 252 Chunk* fc = head()->next(); |
0 | 253 if (fc != NULL) { |
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254 chunk->link_after(fc); |
0 | 255 } else { |
256 assert(tail() == NULL, "List is inconsistent"); | |
257 link_tail(chunk); | |
258 } | |
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259 head()->link_after(chunk); |
0 | 260 assert(!head() || size() == head()->size(), "Wrong sized chunk in list"); |
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261 increment_count(); |
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262 debug_only(increment_returned_bytes_by(chunk->size()*sizeof(HeapWord));) |
0 | 263 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
264 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
265 } | |
266 | |
6026 | 267 template <class Chunk> |
268 TreeChunk<Chunk>* TreeList<Chunk>::head_as_TreeChunk() { | |
269 assert(head() == NULL || TreeChunk<Chunk>::as_TreeChunk(head())->list() == this, | |
0 | 270 "Wrong type of chunk?"); |
6026 | 271 return TreeChunk<Chunk>::as_TreeChunk(head()); |
0 | 272 } |
273 | |
6026 | 274 template <class Chunk> |
275 TreeChunk<Chunk>* TreeList<Chunk>::first_available() { | |
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276 assert(head() != NULL, "The head of the list cannot be NULL"); |
6026 | 277 Chunk* fc = head()->next(); |
278 TreeChunk<Chunk>* retTC; | |
0 | 279 if (fc == NULL) { |
280 retTC = head_as_TreeChunk(); | |
281 } else { | |
6026 | 282 retTC = TreeChunk<Chunk>::as_TreeChunk(fc); |
0 | 283 } |
284 assert(retTC->list() == this, "Wrong type of chunk."); | |
285 return retTC; | |
286 } | |
287 | |
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288 // Returns the block with the largest heap address amongst |
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289 // those in the list for this size; potentially slow and expensive, |
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290 // use with caution! |
6026 | 291 template <class Chunk> |
292 TreeChunk<Chunk>* TreeList<Chunk>::largest_address() { | |
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293 assert(head() != NULL, "The head of the list cannot be NULL"); |
6026 | 294 Chunk* fc = head()->next(); |
295 TreeChunk<Chunk>* retTC; | |
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296 if (fc == NULL) { |
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297 retTC = head_as_TreeChunk(); |
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298 } else { |
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299 // walk down the list and return the one with the highest |
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300 // heap address among chunks of this size. |
6026 | 301 Chunk* last = fc; |
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302 while (fc->next() != NULL) { |
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303 if ((HeapWord*)last < (HeapWord*)fc) { |
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304 last = fc; |
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305 } |
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306 fc = fc->next(); |
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307 } |
6026 | 308 retTC = TreeChunk<Chunk>::as_TreeChunk(last); |
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309 } |
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310 assert(retTC->list() == this, "Wrong type of chunk."); |
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311 return retTC; |
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312 } |
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313 |
6026 | 314 template <class Chunk> |
315 BinaryTreeDictionary<Chunk>::BinaryTreeDictionary(bool adaptive_freelists, bool splay) : | |
316 _splay(splay), _adaptive_freelists(adaptive_freelists), | |
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317 _total_size(0), _total_free_blocks(0), _root(0) {} |
6026 | 318 |
319 template <class Chunk> | |
320 BinaryTreeDictionary<Chunk>::BinaryTreeDictionary(MemRegion mr, | |
321 bool adaptive_freelists, | |
322 bool splay): | |
323 _adaptive_freelists(adaptive_freelists), _splay(splay) | |
0 | 324 { |
6026 | 325 assert(mr.word_size() >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "minimum chunk size"); |
0 | 326 |
327 reset(mr); | |
328 assert(root()->left() == NULL, "reset check failed"); | |
329 assert(root()->right() == NULL, "reset check failed"); | |
330 assert(root()->head()->next() == NULL, "reset check failed"); | |
331 assert(root()->head()->prev() == NULL, "reset check failed"); | |
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332 assert(total_size() == root()->size(), "reset check failed"); |
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333 assert(total_free_blocks() == 1, "reset check failed"); |
0 | 334 } |
335 | |
6026 | 336 template <class Chunk> |
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337 void BinaryTreeDictionary<Chunk>::inc_total_size(size_t inc) { |
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338 _total_size = _total_size + inc; |
0 | 339 } |
340 | |
6026 | 341 template <class Chunk> |
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342 void BinaryTreeDictionary<Chunk>::dec_total_size(size_t dec) { |
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343 _total_size = _total_size - dec; |
0 | 344 } |
345 | |
6026 | 346 template <class Chunk> |
347 void BinaryTreeDictionary<Chunk>::reset(MemRegion mr) { | |
348 assert(mr.word_size() >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "minimum chunk size"); | |
349 set_root(TreeList<Chunk>::as_TreeList(mr.start(), mr.word_size())); | |
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350 set_total_size(mr.word_size()); |
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351 set_total_free_blocks(1); |
0 | 352 } |
353 | |
6026 | 354 template <class Chunk> |
355 void BinaryTreeDictionary<Chunk>::reset(HeapWord* addr, size_t byte_size) { | |
0 | 356 MemRegion mr(addr, heap_word_size(byte_size)); |
357 reset(mr); | |
358 } | |
359 | |
6026 | 360 template <class Chunk> |
361 void BinaryTreeDictionary<Chunk>::reset() { | |
0 | 362 set_root(NULL); |
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363 set_total_size(0); |
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364 set_total_free_blocks(0); |
0 | 365 } |
366 | |
367 // Get a free block of size at least size from tree, or NULL. | |
368 // If a splay step is requested, the removal algorithm (only) incorporates | |
369 // a splay step as follows: | |
370 // . the search proceeds down the tree looking for a possible | |
371 // match. At the (closest) matching location, an appropriate splay step is applied | |
372 // (zig, zig-zig or zig-zag). A chunk of the appropriate size is then returned | |
373 // if available, and if it's the last chunk, the node is deleted. A deteleted | |
374 // node is replaced in place by its tree successor. | |
6026 | 375 template <class Chunk> |
376 TreeChunk<Chunk>* | |
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377 BinaryTreeDictionary<Chunk>::get_chunk_from_tree(size_t size, enum FreeBlockDictionary<Chunk>::Dither dither, bool splay) |
0 | 378 { |
6026 | 379 TreeList<Chunk> *curTL, *prevTL; |
380 TreeChunk<Chunk>* retTC = NULL; | |
381 assert(size >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "minimum chunk size"); | |
0 | 382 if (FLSVerifyDictionary) { |
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383 verify_tree(); |
0 | 384 } |
385 // starting at the root, work downwards trying to find match. | |
386 // Remember the last node of size too great or too small. | |
387 for (prevTL = curTL = root(); curTL != NULL;) { | |
388 if (curTL->size() == size) { // exact match | |
389 break; | |
390 } | |
391 prevTL = curTL; | |
392 if (curTL->size() < size) { // proceed to right sub-tree | |
393 curTL = curTL->right(); | |
394 } else { // proceed to left sub-tree | |
395 assert(curTL->size() > size, "size inconsistency"); | |
396 curTL = curTL->left(); | |
397 } | |
398 } | |
399 if (curTL == NULL) { // couldn't find exact match | |
6026 | 400 |
401 if (dither == FreeBlockDictionary<Chunk>::exactly) return NULL; | |
402 | |
0 | 403 // try and find the next larger size by walking back up the search path |
404 for (curTL = prevTL; curTL != NULL;) { | |
405 if (curTL->size() >= size) break; | |
406 else curTL = curTL->parent(); | |
407 } | |
408 assert(curTL == NULL || curTL->count() > 0, | |
409 "An empty list should not be in the tree"); | |
410 } | |
411 if (curTL != NULL) { | |
412 assert(curTL->size() >= size, "size inconsistency"); | |
6026 | 413 if (adaptive_freelists()) { |
0 | 414 |
415 // A candidate chunk has been found. If it is already under | |
416 // populated, get a chunk associated with the hint for this | |
417 // chunk. | |
418 if (curTL->surplus() <= 0) { | |
419 /* Use the hint to find a size with a surplus, and reset the hint. */ | |
6026 | 420 TreeList<Chunk>* hintTL = curTL; |
0 | 421 while (hintTL->hint() != 0) { |
422 assert(hintTL->hint() == 0 || hintTL->hint() > hintTL->size(), | |
423 "hint points in the wrong direction"); | |
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424 hintTL = find_list(hintTL->hint()); |
0 | 425 assert(curTL != hintTL, "Infinite loop"); |
426 if (hintTL == NULL || | |
427 hintTL == curTL /* Should not happen but protect against it */ ) { | |
428 // No useful hint. Set the hint to NULL and go on. | |
429 curTL->set_hint(0); | |
430 break; | |
431 } | |
432 assert(hintTL->size() > size, "hint is inconsistent"); | |
433 if (hintTL->surplus() > 0) { | |
434 // The hint led to a list that has a surplus. Use it. | |
435 // Set the hint for the candidate to an overpopulated | |
436 // size. | |
437 curTL->set_hint(hintTL->size()); | |
438 // Change the candidate. | |
439 curTL = hintTL; | |
440 break; | |
441 } | |
442 // The evm code reset the hint of the candidate as | |
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443 // at an interim point. Why? Seems like this leaves |
0 | 444 // the hint pointing to a list that didn't work. |
445 // curTL->set_hint(hintTL->size()); | |
446 } | |
447 } | |
448 } | |
449 // don't waste time splaying if chunk's singleton | |
450 if (splay && curTL->head()->next() != NULL) { | |
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451 semi_splay_step(curTL); |
0 | 452 } |
453 retTC = curTL->first_available(); | |
454 assert((retTC != NULL) && (curTL->count() > 0), | |
455 "A list in the binary tree should not be NULL"); | |
456 assert(retTC->size() >= size, | |
457 "A chunk of the wrong size was found"); | |
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458 remove_chunk_from_tree(retTC); |
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459 assert(retTC->is_free(), "Header is not marked correctly"); |
0 | 460 } |
461 | |
462 if (FLSVerifyDictionary) { | |
463 verify(); | |
464 } | |
465 return retTC; | |
466 } | |
467 | |
6026 | 468 template <class Chunk> |
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469 TreeList<Chunk>* BinaryTreeDictionary<Chunk>::find_list(size_t size) const { |
6026 | 470 TreeList<Chunk>* curTL; |
0 | 471 for (curTL = root(); curTL != NULL;) { |
472 if (curTL->size() == size) { // exact match | |
473 break; | |
474 } | |
475 | |
476 if (curTL->size() < size) { // proceed to right sub-tree | |
477 curTL = curTL->right(); | |
478 } else { // proceed to left sub-tree | |
479 assert(curTL->size() > size, "size inconsistency"); | |
480 curTL = curTL->left(); | |
481 } | |
482 } | |
483 return curTL; | |
484 } | |
485 | |
486 | |
6026 | 487 template <class Chunk> |
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488 bool BinaryTreeDictionary<Chunk>::verify_chunk_in_free_list(Chunk* tc) const { |
0 | 489 size_t size = tc->size(); |
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490 TreeList<Chunk>* tl = find_list(size); |
0 | 491 if (tl == NULL) { |
492 return false; | |
493 } else { | |
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494 return tl->verify_chunk_in_free_list(tc); |
0 | 495 } |
496 } | |
497 | |
6026 | 498 template <class Chunk> |
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499 Chunk* BinaryTreeDictionary<Chunk>::find_largest_dict() const { |
6026 | 500 TreeList<Chunk> *curTL = root(); |
0 | 501 if (curTL != NULL) { |
502 while(curTL->right() != NULL) curTL = curTL->right(); | |
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503 return curTL->largest_address(); |
0 | 504 } else { |
505 return NULL; | |
506 } | |
507 } | |
508 | |
509 // Remove the current chunk from the tree. If it is not the last | |
510 // chunk in a list on a tree node, just unlink it. | |
511 // If it is the last chunk in the list (the next link is NULL), | |
512 // remove the node and repair the tree. | |
6026 | 513 template <class Chunk> |
514 TreeChunk<Chunk>* | |
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515 BinaryTreeDictionary<Chunk>::remove_chunk_from_tree(TreeChunk<Chunk>* tc) { |
0 | 516 assert(tc != NULL, "Should not call with a NULL chunk"); |
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517 assert(tc->is_free(), "Header is not marked correctly"); |
0 | 518 |
6026 | 519 TreeList<Chunk> *newTL, *parentTL; |
520 TreeChunk<Chunk>* retTC; | |
521 TreeList<Chunk>* tl = tc->list(); | |
0 | 522 debug_only( |
523 bool removing_only_chunk = false; | |
524 if (tl == _root) { | |
525 if ((_root->left() == NULL) && (_root->right() == NULL)) { | |
526 if (_root->count() == 1) { | |
527 assert(_root->head() == tc, "Should only be this one chunk"); | |
528 removing_only_chunk = true; | |
529 } | |
530 } | |
531 } | |
532 ) | |
533 assert(tl != NULL, "List should be set"); | |
534 assert(tl->parent() == NULL || tl == tl->parent()->left() || | |
535 tl == tl->parent()->right(), "list is inconsistent"); | |
536 | |
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537 bool complicated_splice = false; |
0 | 538 |
539 retTC = tc; | |
540 // Removing this chunk can have the side effect of changing the node | |
6026 | 541 // (TreeList<Chunk>*) in the tree. If the node is the root, update it. |
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542 TreeList<Chunk>* replacementTL = tl->remove_chunk_replace_if_needed(tc); |
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543 assert(tc->is_free(), "Chunk should still be free"); |
0 | 544 assert(replacementTL->parent() == NULL || |
545 replacementTL == replacementTL->parent()->left() || | |
546 replacementTL == replacementTL->parent()->right(), | |
547 "list is inconsistent"); | |
548 if (tl == root()) { | |
549 assert(replacementTL->parent() == NULL, "Incorrectly replacing root"); | |
550 set_root(replacementTL); | |
551 } | |
552 debug_only( | |
553 if (tl != replacementTL) { | |
554 assert(replacementTL->head() != NULL, | |
555 "If the tree list was replaced, it should not be a NULL list"); | |
6026 | 556 TreeList<Chunk>* rhl = replacementTL->head_as_TreeChunk()->list(); |
557 TreeList<Chunk>* rtl = TreeChunk<Chunk>::as_TreeChunk(replacementTL->tail())->list(); | |
0 | 558 assert(rhl == replacementTL, "Broken head"); |
559 assert(rtl == replacementTL, "Broken tail"); | |
560 assert(replacementTL->size() == tc->size(), "Broken size"); | |
561 } | |
562 ) | |
563 | |
564 // Does the tree need to be repaired? | |
565 if (replacementTL->count() == 0) { | |
566 assert(replacementTL->head() == NULL && | |
567 replacementTL->tail() == NULL, "list count is incorrect"); | |
568 // Find the replacement node for the (soon to be empty) node being removed. | |
569 // if we have a single (or no) child, splice child in our stead | |
570 if (replacementTL->left() == NULL) { | |
571 // left is NULL so pick right. right may also be NULL. | |
572 newTL = replacementTL->right(); | |
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573 debug_only(replacementTL->clear_right();) |
0 | 574 } else if (replacementTL->right() == NULL) { |
575 // right is NULL | |
576 newTL = replacementTL->left(); | |
577 debug_only(replacementTL->clearLeft();) | |
578 } else { // we have both children, so, by patriarchal convention, | |
579 // my replacement is least node in right sub-tree | |
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580 complicated_splice = true; |
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581 newTL = remove_tree_minimum(replacementTL->right()); |
0 | 582 assert(newTL != NULL && newTL->left() == NULL && |
583 newTL->right() == NULL, "sub-tree minimum exists"); | |
584 } | |
585 // newTL is the replacement for the (soon to be empty) node. | |
586 // newTL may be NULL. | |
587 // should verify; we just cleanly excised our replacement | |
588 if (FLSVerifyDictionary) { | |
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589 verify_tree(); |
0 | 590 } |
591 // first make newTL my parent's child | |
592 if ((parentTL = replacementTL->parent()) == NULL) { | |
593 // newTL should be root | |
594 assert(tl == root(), "Incorrectly replacing root"); | |
595 set_root(newTL); | |
596 if (newTL != NULL) { | |
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597 newTL->clear_parent(); |
0 | 598 } |
599 } else if (parentTL->right() == replacementTL) { | |
600 // replacementTL is a right child | |
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601 parentTL->set_right(newTL); |
0 | 602 } else { // replacementTL is a left child |
603 assert(parentTL->left() == replacementTL, "should be left child"); | |
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604 parentTL->set_left(newTL); |
0 | 605 } |
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606 debug_only(replacementTL->clear_parent();) |
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607 if (complicated_splice) { // we need newTL to get replacementTL's |
0 | 608 // two children |
609 assert(newTL != NULL && | |
610 newTL->left() == NULL && newTL->right() == NULL, | |
611 "newTL should not have encumbrances from the past"); | |
612 // we'd like to assert as below: | |
613 // assert(replacementTL->left() != NULL && replacementTL->right() != NULL, | |
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614 // "else !complicated_splice"); |
0 | 615 // ... however, the above assertion is too strong because we aren't |
616 // guaranteed that replacementTL->right() is still NULL. | |
617 // Recall that we removed | |
618 // the right sub-tree minimum from replacementTL. | |
619 // That may well have been its right | |
620 // child! So we'll just assert half of the above: | |
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621 assert(replacementTL->left() != NULL, "else !complicated_splice"); |
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622 newTL->set_left(replacementTL->left()); |
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623 newTL->set_right(replacementTL->right()); |
0 | 624 debug_only( |
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625 replacementTL->clear_right(); |
0 | 626 replacementTL->clearLeft(); |
627 ) | |
628 } | |
629 assert(replacementTL->right() == NULL && | |
630 replacementTL->left() == NULL && | |
631 replacementTL->parent() == NULL, | |
632 "delete without encumbrances"); | |
633 } | |
634 | |
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635 assert(total_size() >= retTC->size(), "Incorrect total size"); |
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636 dec_total_size(retTC->size()); // size book-keeping |
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637 assert(total_free_blocks() > 0, "Incorrect total count"); |
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638 set_total_free_blocks(total_free_blocks() - 1); |
0 | 639 |
640 assert(retTC != NULL, "null chunk?"); | |
641 assert(retTC->prev() == NULL && retTC->next() == NULL, | |
642 "should return without encumbrances"); | |
643 if (FLSVerifyDictionary) { | |
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644 verify_tree(); |
0 | 645 } |
646 assert(!removing_only_chunk || _root == NULL, "root should be NULL"); | |
6026 | 647 return TreeChunk<Chunk>::as_TreeChunk(retTC); |
0 | 648 } |
649 | |
650 // Remove the leftmost node (lm) in the tree and return it. | |
651 // If lm has a right child, link it to the left node of | |
652 // the parent of lm. | |
6026 | 653 template <class Chunk> |
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654 TreeList<Chunk>* BinaryTreeDictionary<Chunk>::remove_tree_minimum(TreeList<Chunk>* tl) { |
0 | 655 assert(tl != NULL && tl->parent() != NULL, "really need a proper sub-tree"); |
656 // locate the subtree minimum by walking down left branches | |
6026 | 657 TreeList<Chunk>* curTL = tl; |
0 | 658 for (; curTL->left() != NULL; curTL = curTL->left()); |
659 // obviously curTL now has at most one child, a right child | |
660 if (curTL != root()) { // Should this test just be removed? | |
6026 | 661 TreeList<Chunk>* parentTL = curTL->parent(); |
0 | 662 if (parentTL->left() == curTL) { // curTL is a left child |
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663 parentTL->set_left(curTL->right()); |
0 | 664 } else { |
665 // If the list tl has no left child, then curTL may be | |
666 // the right child of parentTL. | |
667 assert(parentTL->right() == curTL, "should be a right child"); | |
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668 parentTL->set_right(curTL->right()); |
0 | 669 } |
670 } else { | |
671 // The only use of this method would not pass the root of the | |
672 // tree (as indicated by the assertion above that the tree list | |
673 // has a parent) but the specification does not explicitly exclude the | |
674 // passing of the root so accomodate it. | |
675 set_root(NULL); | |
676 } | |
677 debug_only( | |
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678 curTL->clear_parent(); // Test if this needs to be cleared |
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679 curTL->clear_right(); // recall, above, left child is already null |
0 | 680 ) |
681 // we just excised a (non-root) node, we should still verify all tree invariants | |
682 if (FLSVerifyDictionary) { | |
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683 verify_tree(); |
0 | 684 } |
685 return curTL; | |
686 } | |
687 | |
688 // Based on a simplification of the algorithm by Sleator and Tarjan (JACM 1985). | |
689 // The simplifications are the following: | |
690 // . we splay only when we delete (not when we insert) | |
691 // . we apply a single spay step per deletion/access | |
692 // By doing such partial splaying, we reduce the amount of restructuring, | |
693 // while getting a reasonably efficient search tree (we think). | |
694 // [Measurements will be needed to (in)validate this expectation.] | |
695 | |
6026 | 696 template <class Chunk> |
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697 void BinaryTreeDictionary<Chunk>::semi_splay_step(TreeList<Chunk>* tc) { |
0 | 698 // apply a semi-splay step at the given node: |
699 // . if root, norting needs to be done | |
700 // . if child of root, splay once | |
701 // . else zig-zig or sig-zag depending on path from grandparent | |
702 if (root() == tc) return; | |
703 warning("*** Splaying not yet implemented; " | |
704 "tree operations may be inefficient ***"); | |
705 } | |
706 | |
6026 | 707 template <class Chunk> |
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708 void BinaryTreeDictionary<Chunk>::insert_chunk_in_tree(Chunk* fc) { |
6026 | 709 TreeList<Chunk> *curTL, *prevTL; |
0 | 710 size_t size = fc->size(); |
711 | |
6026 | 712 assert(size >= BinaryTreeDictionary<Chunk>::min_tree_chunk_size, "too small to be a TreeList<Chunk>"); |
0 | 713 if (FLSVerifyDictionary) { |
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714 verify_tree(); |
0 | 715 } |
716 | |
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717 fc->clear_next(); |
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718 fc->link_prev(NULL); |
0 | 719 |
720 // work down from the _root, looking for insertion point | |
721 for (prevTL = curTL = root(); curTL != NULL;) { | |
722 if (curTL->size() == size) // exact match | |
723 break; | |
724 prevTL = curTL; | |
725 if (curTL->size() > size) { // follow left branch | |
726 curTL = curTL->left(); | |
727 } else { // follow right branch | |
728 assert(curTL->size() < size, "size inconsistency"); | |
729 curTL = curTL->right(); | |
730 } | |
731 } | |
6026 | 732 TreeChunk<Chunk>* tc = TreeChunk<Chunk>::as_TreeChunk(fc); |
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733 // This chunk is being returned to the binary tree. Its embedded |
6026 | 734 // TreeList<Chunk> should be unused at this point. |
0 | 735 tc->initialize(); |
736 if (curTL != NULL) { // exact match | |
737 tc->set_list(curTL); | |
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738 curTL->return_chunk_at_tail(tc); |
0 | 739 } else { // need a new node in tree |
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740 tc->clear_next(); |
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741 tc->link_prev(NULL); |
6026 | 742 TreeList<Chunk>* newTL = TreeList<Chunk>::as_TreeList(tc); |
743 assert(((TreeChunk<Chunk>*)tc)->list() == newTL, | |
0 | 744 "List was not initialized correctly"); |
745 if (prevTL == NULL) { // we are the only tree node | |
746 assert(root() == NULL, "control point invariant"); | |
747 set_root(newTL); | |
748 } else { // insert under prevTL ... | |
749 if (prevTL->size() < size) { // am right child | |
750 assert(prevTL->right() == NULL, "control point invariant"); | |
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751 prevTL->set_right(newTL); |
0 | 752 } else { // am left child |
753 assert(prevTL->size() > size && prevTL->left() == NULL, "cpt pt inv"); | |
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754 prevTL->set_left(newTL); |
0 | 755 } |
756 } | |
757 } | |
758 assert(tc->list() != NULL, "Tree list should be set"); | |
759 | |
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760 inc_total_size(size); |
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761 // Method 'total_size_in_tree' walks through the every block in the |
0 | 762 // tree, so it can cause significant performance loss if there are |
763 // many blocks in the tree | |
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764 assert(!FLSVerifyDictionary || total_size_in_tree(root()) == total_size(), "_total_size inconsistency"); |
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765 set_total_free_blocks(total_free_blocks() + 1); |
0 | 766 if (FLSVerifyDictionary) { |
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767 verify_tree(); |
0 | 768 } |
769 } | |
770 | |
6026 | 771 template <class Chunk> |
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772 size_t BinaryTreeDictionary<Chunk>::max_chunk_size() const { |
6026 | 773 FreeBlockDictionary<Chunk>::verify_par_locked(); |
774 TreeList<Chunk>* tc = root(); | |
0 | 775 if (tc == NULL) return 0; |
776 for (; tc->right() != NULL; tc = tc->right()); | |
777 return tc->size(); | |
778 } | |
779 | |
6026 | 780 template <class Chunk> |
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781 size_t BinaryTreeDictionary<Chunk>::total_list_length(TreeList<Chunk>* tl) const { |
0 | 782 size_t res; |
783 res = tl->count(); | |
784 #ifdef ASSERT | |
785 size_t cnt; | |
6026 | 786 Chunk* tc = tl->head(); |
0 | 787 for (cnt = 0; tc != NULL; tc = tc->next(), cnt++); |
788 assert(res == cnt, "The count is not being maintained correctly"); | |
789 #endif | |
790 return res; | |
791 } | |
792 | |
6026 | 793 template <class Chunk> |
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794 size_t BinaryTreeDictionary<Chunk>::total_size_in_tree(TreeList<Chunk>* tl) const { |
0 | 795 if (tl == NULL) |
796 return 0; | |
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797 return (tl->size() * total_list_length(tl)) + |
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798 total_size_in_tree(tl->left()) + |
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799 total_size_in_tree(tl->right()); |
0 | 800 } |
801 | |
6026 | 802 template <class Chunk> |
803 double BinaryTreeDictionary<Chunk>::sum_of_squared_block_sizes(TreeList<Chunk>* const tl) const { | |
0 | 804 if (tl == NULL) { |
805 return 0.0; | |
806 } | |
807 double size = (double)(tl->size()); | |
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808 double curr = size * size * total_list_length(tl); |
0 | 809 curr += sum_of_squared_block_sizes(tl->left()); |
810 curr += sum_of_squared_block_sizes(tl->right()); | |
811 return curr; | |
812 } | |
813 | |
6026 | 814 template <class Chunk> |
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815 size_t BinaryTreeDictionary<Chunk>::total_free_blocks_in_tree(TreeList<Chunk>* tl) const { |
0 | 816 if (tl == NULL) |
817 return 0; | |
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818 return total_list_length(tl) + |
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819 total_free_blocks_in_tree(tl->left()) + |
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820 total_free_blocks_in_tree(tl->right()); |
0 | 821 } |
822 | |
6026 | 823 template <class Chunk> |
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824 size_t BinaryTreeDictionary<Chunk>::num_free_blocks() const { |
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825 assert(total_free_blocks_in_tree(root()) == total_free_blocks(), |
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826 "_total_free_blocks inconsistency"); |
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827 return total_free_blocks(); |
0 | 828 } |
829 | |
6026 | 830 template <class Chunk> |
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831 size_t BinaryTreeDictionary<Chunk>::tree_height_helper(TreeList<Chunk>* tl) const { |
0 | 832 if (tl == NULL) |
833 return 0; | |
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834 return 1 + MAX2(tree_height_helper(tl->left()), |
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835 tree_height_helper(tl->right())); |
0 | 836 } |
837 | |
6026 | 838 template <class Chunk> |
839 size_t BinaryTreeDictionary<Chunk>::treeHeight() const { | |
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840 return tree_height_helper(root()); |
0 | 841 } |
842 | |
6026 | 843 template <class Chunk> |
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844 size_t BinaryTreeDictionary<Chunk>::total_nodes_helper(TreeList<Chunk>* tl) const { |
0 | 845 if (tl == NULL) { |
846 return 0; | |
847 } | |
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848 return 1 + total_nodes_helper(tl->left()) + |
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849 total_nodes_helper(tl->right()); |
0 | 850 } |
851 | |
6026 | 852 template <class Chunk> |
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853 size_t BinaryTreeDictionary<Chunk>::total_nodes_in_tree(TreeList<Chunk>* tl) const { |
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854 return total_nodes_helper(root()); |
0 | 855 } |
856 | |
6026 | 857 template <class Chunk> |
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858 void BinaryTreeDictionary<Chunk>::dict_census_udpate(size_t size, bool split, bool birth){ |
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859 TreeList<Chunk>* nd = find_list(size); |
0 | 860 if (nd) { |
861 if (split) { | |
862 if (birth) { | |
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863 nd->increment_split_births(); |
0 | 864 nd->increment_surplus(); |
865 } else { | |
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866 nd->increment_split_deaths(); |
0 | 867 nd->decrement_surplus(); |
868 } | |
869 } else { | |
870 if (birth) { | |
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871 nd->increment_coal_births(); |
0 | 872 nd->increment_surplus(); |
873 } else { | |
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874 nd->increment_coal_deaths(); |
0 | 875 nd->decrement_surplus(); |
876 } | |
877 } | |
878 } | |
879 // A list for this size may not be found (nd == 0) if | |
880 // This is a death where the appropriate list is now | |
881 // empty and has been removed from the list. | |
882 // This is a birth associated with a LinAB. The chunk | |
883 // for the LinAB is not in the dictionary. | |
884 } | |
885 | |
6026 | 886 template <class Chunk> |
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887 bool BinaryTreeDictionary<Chunk>::coal_dict_over_populated(size_t size) { |
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888 if (FLSAlwaysCoalesceLarge) return true; |
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889 |
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890 TreeList<Chunk>* list_of_size = find_list(size); |
0 | 891 // None of requested size implies overpopulated. |
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892 return list_of_size == NULL || list_of_size->coal_desired() <= 0 || |
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893 list_of_size->count() > list_of_size->coal_desired(); |
0 | 894 } |
895 | |
896 // Closures for walking the binary tree. | |
897 // do_list() walks the free list in a node applying the closure | |
898 // to each free chunk in the list | |
899 // do_tree() walks the nodes in the binary tree applying do_list() | |
900 // to each list at each node. | |
901 | |
6026 | 902 template <class Chunk> |
0 | 903 class TreeCensusClosure : public StackObj { |
904 protected: | |
6026 | 905 virtual void do_list(FreeList<Chunk>* fl) = 0; |
0 | 906 public: |
6026 | 907 virtual void do_tree(TreeList<Chunk>* tl) = 0; |
0 | 908 }; |
909 | |
6026 | 910 template <class Chunk> |
911 class AscendTreeCensusClosure : public TreeCensusClosure<Chunk> { | |
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912 using TreeCensusClosure<Chunk>::do_list; |
0 | 913 public: |
6026 | 914 void do_tree(TreeList<Chunk>* tl) { |
0 | 915 if (tl != NULL) { |
916 do_tree(tl->left()); | |
917 do_list(tl); | |
918 do_tree(tl->right()); | |
919 } | |
920 } | |
921 }; | |
922 | |
6026 | 923 template <class Chunk> |
924 class DescendTreeCensusClosure : public TreeCensusClosure<Chunk> { | |
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925 using TreeCensusClosure<Chunk>::do_list; |
0 | 926 public: |
6026 | 927 void do_tree(TreeList<Chunk>* tl) { |
0 | 928 if (tl != NULL) { |
929 do_tree(tl->right()); | |
930 do_list(tl); | |
931 do_tree(tl->left()); | |
932 } | |
933 } | |
934 }; | |
935 | |
936 // For each list in the tree, calculate the desired, desired | |
937 // coalesce, count before sweep, and surplus before sweep. | |
6026 | 938 template <class Chunk> |
939 class BeginSweepClosure : public AscendTreeCensusClosure<Chunk> { | |
0 | 940 double _percentage; |
941 float _inter_sweep_current; | |
942 float _inter_sweep_estimate; | |
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943 float _intra_sweep_estimate; |
0 | 944 |
945 public: | |
946 BeginSweepClosure(double p, float inter_sweep_current, | |
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947 float inter_sweep_estimate, |
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948 float intra_sweep_estimate) : |
0 | 949 _percentage(p), |
950 _inter_sweep_current(inter_sweep_current), | |
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951 _inter_sweep_estimate(inter_sweep_estimate), |
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952 _intra_sweep_estimate(intra_sweep_estimate) { } |
0 | 953 |
6026 | 954 void do_list(FreeList<Chunk>* fl) { |
0 | 955 double coalSurplusPercent = _percentage; |
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956 fl->compute_desired(_inter_sweep_current, _inter_sweep_estimate, _intra_sweep_estimate); |
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957 fl->set_coal_desired((ssize_t)((double)fl->desired() * coalSurplusPercent)); |
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958 fl->set_before_sweep(fl->count()); |
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959 fl->set_bfr_surp(fl->surplus()); |
0 | 960 } |
961 }; | |
962 | |
963 // Used to search the tree until a condition is met. | |
964 // Similar to TreeCensusClosure but searches the | |
965 // tree and returns promptly when found. | |
966 | |
6026 | 967 template <class Chunk> |
0 | 968 class TreeSearchClosure : public StackObj { |
969 protected: | |
6026 | 970 virtual bool do_list(FreeList<Chunk>* fl) = 0; |
0 | 971 public: |
6026 | 972 virtual bool do_tree(TreeList<Chunk>* tl) = 0; |
0 | 973 }; |
974 | |
975 #if 0 // Don't need this yet but here for symmetry. | |
6026 | 976 template <class Chunk> |
0 | 977 class AscendTreeSearchClosure : public TreeSearchClosure { |
978 public: | |
6026 | 979 bool do_tree(TreeList<Chunk>* tl) { |
0 | 980 if (tl != NULL) { |
981 if (do_tree(tl->left())) return true; | |
982 if (do_list(tl)) return true; | |
983 if (do_tree(tl->right())) return true; | |
984 } | |
985 return false; | |
986 } | |
987 }; | |
988 #endif | |
989 | |
6026 | 990 template <class Chunk> |
991 class DescendTreeSearchClosure : public TreeSearchClosure<Chunk> { | |
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992 using TreeSearchClosure<Chunk>::do_list; |
0 | 993 public: |
6026 | 994 bool do_tree(TreeList<Chunk>* tl) { |
0 | 995 if (tl != NULL) { |
996 if (do_tree(tl->right())) return true; | |
997 if (do_list(tl)) return true; | |
998 if (do_tree(tl->left())) return true; | |
999 } | |
1000 return false; | |
1001 } | |
1002 }; | |
1003 | |
1004 // Searches the tree for a chunk that ends at the | |
1005 // specified address. | |
6026 | 1006 template <class Chunk> |
1007 class EndTreeSearchClosure : public DescendTreeSearchClosure<Chunk> { | |
0 | 1008 HeapWord* _target; |
6026 | 1009 Chunk* _found; |
0 | 1010 |
1011 public: | |
1012 EndTreeSearchClosure(HeapWord* target) : _target(target), _found(NULL) {} | |
6026 | 1013 bool do_list(FreeList<Chunk>* fl) { |
1014 Chunk* item = fl->head(); | |
0 | 1015 while (item != NULL) { |
1016 if (item->end() == _target) { | |
1017 _found = item; | |
1018 return true; | |
1019 } | |
1020 item = item->next(); | |
1021 } | |
1022 return false; | |
1023 } | |
6026 | 1024 Chunk* found() { return _found; } |
0 | 1025 }; |
1026 | |
6026 | 1027 template <class Chunk> |
1028 Chunk* BinaryTreeDictionary<Chunk>::find_chunk_ends_at(HeapWord* target) const { | |
1029 EndTreeSearchClosure<Chunk> etsc(target); | |
0 | 1030 bool found_target = etsc.do_tree(root()); |
1031 assert(found_target || etsc.found() == NULL, "Consistency check"); | |
1032 assert(!found_target || etsc.found() != NULL, "Consistency check"); | |
1033 return etsc.found(); | |
1034 } | |
1035 | |
6026 | 1036 template <class Chunk> |
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1037 void BinaryTreeDictionary<Chunk>::begin_sweep_dict_census(double coalSurplusPercent, |
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1038 float inter_sweep_current, float inter_sweep_estimate, float intra_sweep_estimate) { |
6026 | 1039 BeginSweepClosure<Chunk> bsc(coalSurplusPercent, inter_sweep_current, |
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1040 inter_sweep_estimate, |
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1041 intra_sweep_estimate); |
0 | 1042 bsc.do_tree(root()); |
1043 } | |
1044 | |
1045 // Closures and methods for calculating total bytes returned to the | |
1046 // free lists in the tree. | |
6026 | 1047 #ifndef PRODUCT |
1048 template <class Chunk> | |
1049 class InitializeDictReturnedBytesClosure : public AscendTreeCensusClosure<Chunk> { | |
0 | 1050 public: |
6026 | 1051 void do_list(FreeList<Chunk>* fl) { |
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1052 fl->set_returned_bytes(0); |
6026 | 1053 } |
1054 }; | |
0 | 1055 |
6026 | 1056 template <class Chunk> |
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1057 void BinaryTreeDictionary<Chunk>::initialize_dict_returned_bytes() { |
6026 | 1058 InitializeDictReturnedBytesClosure<Chunk> idrb; |
1059 idrb.do_tree(root()); | |
1060 } | |
0 | 1061 |
6026 | 1062 template <class Chunk> |
1063 class ReturnedBytesClosure : public AscendTreeCensusClosure<Chunk> { | |
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1064 size_t _dict_returned_bytes; |
6026 | 1065 public: |
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1066 ReturnedBytesClosure() { _dict_returned_bytes = 0; } |
6026 | 1067 void do_list(FreeList<Chunk>* fl) { |
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1068 _dict_returned_bytes += fl->returned_bytes(); |
6026 | 1069 } |
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1070 size_t dict_returned_bytes() { return _dict_returned_bytes; } |
6026 | 1071 }; |
0 | 1072 |
6026 | 1073 template <class Chunk> |
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1074 size_t BinaryTreeDictionary<Chunk>::sum_dict_returned_bytes() { |
6026 | 1075 ReturnedBytesClosure<Chunk> rbc; |
1076 rbc.do_tree(root()); | |
0 | 1077 |
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1078 return rbc.dict_returned_bytes(); |
6026 | 1079 } |
0 | 1080 |
6026 | 1081 // Count the number of entries in the tree. |
1082 template <class Chunk> | |
1083 class treeCountClosure : public DescendTreeCensusClosure<Chunk> { | |
1084 public: | |
1085 uint count; | |
1086 treeCountClosure(uint c) { count = c; } | |
1087 void do_list(FreeList<Chunk>* fl) { | |
1088 count++; | |
1089 } | |
1090 }; | |
0 | 1091 |
6026 | 1092 template <class Chunk> |
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1093 size_t BinaryTreeDictionary<Chunk>::total_count() { |
6026 | 1094 treeCountClosure<Chunk> ctc(0); |
1095 ctc.do_tree(root()); | |
1096 return ctc.count; | |
1097 } | |
1098 #endif // PRODUCT | |
0 | 1099 |
1100 // Calculate surpluses for the lists in the tree. | |
6026 | 1101 template <class Chunk> |
1102 class setTreeSurplusClosure : public AscendTreeCensusClosure<Chunk> { | |
0 | 1103 double percentage; |
1104 public: | |
1105 setTreeSurplusClosure(double v) { percentage = v; } | |
6026 | 1106 void do_list(FreeList<Chunk>* fl) { |
0 | 1107 double splitSurplusPercent = percentage; |
1108 fl->set_surplus(fl->count() - | |
1109 (ssize_t)((double)fl->desired() * splitSurplusPercent)); | |
1110 } | |
1111 }; | |
1112 | |
6026 | 1113 template <class Chunk> |
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1114 void BinaryTreeDictionary<Chunk>::set_tree_surplus(double splitSurplusPercent) { |
6026 | 1115 setTreeSurplusClosure<Chunk> sts(splitSurplusPercent); |
0 | 1116 sts.do_tree(root()); |
1117 } | |
1118 | |
1119 // Set hints for the lists in the tree. | |
6026 | 1120 template <class Chunk> |
1121 class setTreeHintsClosure : public DescendTreeCensusClosure<Chunk> { | |
0 | 1122 size_t hint; |
1123 public: | |
1124 setTreeHintsClosure(size_t v) { hint = v; } | |
6026 | 1125 void do_list(FreeList<Chunk>* fl) { |
0 | 1126 fl->set_hint(hint); |
1127 assert(fl->hint() == 0 || fl->hint() > fl->size(), | |
1128 "Current hint is inconsistent"); | |
1129 if (fl->surplus() > 0) { | |
1130 hint = fl->size(); | |
1131 } | |
1132 } | |
1133 }; | |
1134 | |
6026 | 1135 template <class Chunk> |
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1136 void BinaryTreeDictionary<Chunk>::set_tree_hints(void) { |
6026 | 1137 setTreeHintsClosure<Chunk> sth(0); |
0 | 1138 sth.do_tree(root()); |
1139 } | |
1140 | |
1141 // Save count before previous sweep and splits and coalesces. | |
6026 | 1142 template <class Chunk> |
1143 class clearTreeCensusClosure : public AscendTreeCensusClosure<Chunk> { | |
1144 void do_list(FreeList<Chunk>* fl) { | |
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1145 fl->set_prev_sweep(fl->count()); |
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1146 fl->set_coal_births(0); |
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1147 fl->set_coal_deaths(0); |
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1148 fl->set_split_births(0); |
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1149 fl->set_split_deaths(0); |
0 | 1150 } |
1151 }; | |
1152 | |
6026 | 1153 template <class Chunk> |
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1154 void BinaryTreeDictionary<Chunk>::clear_tree_census(void) { |
6026 | 1155 clearTreeCensusClosure<Chunk> ctc; |
0 | 1156 ctc.do_tree(root()); |
1157 } | |
1158 | |
1159 // Do reporting and post sweep clean up. | |
6026 | 1160 template <class Chunk> |
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1161 void BinaryTreeDictionary<Chunk>::end_sweep_dict_census(double splitSurplusPercent) { |
0 | 1162 // Does walking the tree 3 times hurt? |
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1163 set_tree_surplus(splitSurplusPercent); |
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1164 set_tree_hints(); |
0 | 1165 if (PrintGC && Verbose) { |
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1166 report_statistics(); |
0 | 1167 } |
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1168 clear_tree_census(); |
0 | 1169 } |
1170 | |
1171 // Print summary statistics | |
6026 | 1172 template <class Chunk> |
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1173 void BinaryTreeDictionary<Chunk>::report_statistics() const { |
6026 | 1174 FreeBlockDictionary<Chunk>::verify_par_locked(); |
0 | 1175 gclog_or_tty->print("Statistics for BinaryTreeDictionary:\n" |
1176 "------------------------------------\n"); | |
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1177 size_t total_size = total_chunk_size(debug_only(NULL)); |
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1178 size_t free_blocks = num_free_blocks(); |
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1179 gclog_or_tty->print("Total Free Space: %d\n", total_size); |
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1180 gclog_or_tty->print("Max Chunk Size: %d\n", max_chunk_size()); |
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1181 gclog_or_tty->print("Number of Blocks: %d\n", free_blocks); |
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1182 if (free_blocks > 0) { |
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1183 gclog_or_tty->print("Av. Block Size: %d\n", total_size/free_blocks); |
0 | 1184 } |
1185 gclog_or_tty->print("Tree Height: %d\n", treeHeight()); | |
1186 } | |
1187 | |
1188 // Print census information - counts, births, deaths, etc. | |
1189 // for each list in the tree. Also print some summary | |
1190 // information. | |
6026 | 1191 template <class Chunk> |
1192 class PrintTreeCensusClosure : public AscendTreeCensusClosure<Chunk> { | |
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1193 int _print_line; |
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1194 size_t _total_free; |
6026 | 1195 FreeList<Chunk> _total; |
0 | 1196 |
1197 public: | |
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1198 PrintTreeCensusClosure() { |
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1199 _print_line = 0; |
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1200 _total_free = 0; |
0 | 1201 } |
6026 | 1202 FreeList<Chunk>* total() { return &_total; } |
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1203 size_t total_free() { return _total_free; } |
6026 | 1204 void do_list(FreeList<Chunk>* fl) { |
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1205 if (++_print_line >= 40) { |
6026 | 1206 FreeList<Chunk>::print_labels_on(gclog_or_tty, "size"); |
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1207 _print_line = 0; |
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1208 } |
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1209 fl->print_on(gclog_or_tty); |
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1210 _total_free += fl->count() * fl->size() ; |
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1211 total()->set_count( total()->count() + fl->count() ); |
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1212 total()->set_bfr_surp( total()->bfr_surp() + fl->bfr_surp() ); |
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1213 total()->set_surplus( total()->split_deaths() + fl->surplus() ); |
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1214 total()->set_desired( total()->desired() + fl->desired() ); |
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1215 total()->set_prev_sweep( total()->prev_sweep() + fl->prev_sweep() ); |
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1216 total()->set_before_sweep(total()->before_sweep() + fl->before_sweep()); |
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1217 total()->set_coal_births( total()->coal_births() + fl->coal_births() ); |
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1218 total()->set_coal_deaths( total()->coal_deaths() + fl->coal_deaths() ); |
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1219 total()->set_split_births(total()->split_births() + fl->split_births()); |
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1220 total()->set_split_deaths(total()->split_deaths() + fl->split_deaths()); |
0 | 1221 } |
1222 }; | |
1223 | |
6026 | 1224 template <class Chunk> |
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1225 void BinaryTreeDictionary<Chunk>::print_dict_census(void) const { |
0 | 1226 |
1227 gclog_or_tty->print("\nBinaryTree\n"); | |
6026 | 1228 FreeList<Chunk>::print_labels_on(gclog_or_tty, "size"); |
1229 PrintTreeCensusClosure<Chunk> ptc; | |
0 | 1230 ptc.do_tree(root()); |
1231 | |
6026 | 1232 FreeList<Chunk>* total = ptc.total(); |
1233 FreeList<Chunk>::print_labels_on(gclog_or_tty, " "); | |
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1234 total->print_on(gclog_or_tty, "TOTAL\t"); |
0 | 1235 gclog_or_tty->print( |
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1236 "total_free(words): " SIZE_FORMAT_W(16) |
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1237 " growth: %8.5f deficit: %8.5f\n", |
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1238 ptc.total_free(), |
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1239 (double)(total->split_births() + total->coal_births() |
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1240 - total->split_deaths() - total->coal_deaths()) |
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1241 /(total->prev_sweep() != 0 ? (double)total->prev_sweep() : 1.0), |
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1242 (double)(total->desired() - total->count()) |
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1243 /(total->desired() != 0 ? (double)total->desired() : 1.0)); |
0 | 1244 } |
1245 | |
6026 | 1246 template <class Chunk> |
1247 class PrintFreeListsClosure : public AscendTreeCensusClosure<Chunk> { | |
1145
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1248 outputStream* _st; |
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1249 int _print_line; |
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1250 |
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1251 public: |
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1252 PrintFreeListsClosure(outputStream* st) { |
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1253 _st = st; |
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1254 _print_line = 0; |
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1255 } |
6026 | 1256 void do_list(FreeList<Chunk>* fl) { |
1145
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1257 if (++_print_line >= 40) { |
6026 | 1258 FreeList<Chunk>::print_labels_on(_st, "size"); |
1145
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1259 _print_line = 0; |
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1260 } |
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1261 fl->print_on(gclog_or_tty); |
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1262 size_t sz = fl->size(); |
6026 | 1263 for (Chunk* fc = fl->head(); fc != NULL; |
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1264 fc = fc->next()) { |
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1265 _st->print_cr("\t[" PTR_FORMAT "," PTR_FORMAT ") %s", |
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1266 fc, (HeapWord*)fc + sz, |
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1267 fc->cantCoalesce() ? "\t CC" : ""); |
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1268 } |
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1269 } |
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1270 }; |
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1271 |
6026 | 1272 template <class Chunk> |
1273 void BinaryTreeDictionary<Chunk>::print_free_lists(outputStream* st) const { | |
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1274 |
6026 | 1275 FreeList<Chunk>::print_labels_on(st, "size"); |
1276 PrintFreeListsClosure<Chunk> pflc(st); | |
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1277 pflc.do_tree(root()); |
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1278 } |
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1279 |
0 | 1280 // Verify the following tree invariants: |
1281 // . _root has no parent | |
1282 // . parent and child point to each other | |
1283 // . each node's key correctly related to that of its child(ren) | |
6026 | 1284 template <class Chunk> |
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1285 void BinaryTreeDictionary<Chunk>::verify_tree() const { |
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1286 guarantee(root() == NULL || total_free_blocks() == 0 || |
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1287 total_size() != 0, "_total_size should't be 0?"); |
0 | 1288 guarantee(root() == NULL || root()->parent() == NULL, "_root shouldn't have parent"); |
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1289 verify_tree_helper(root()); |
0 | 1290 } |
1291 | |
6026 | 1292 template <class Chunk> |
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1293 size_t BinaryTreeDictionary<Chunk>::verify_prev_free_ptrs(TreeList<Chunk>* tl) { |
0 | 1294 size_t ct = 0; |
6026 | 1295 for (Chunk* curFC = tl->head(); curFC != NULL; curFC = curFC->next()) { |
0 | 1296 ct++; |
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1297 assert(curFC->prev() == NULL || curFC->prev()->is_free(), |
0 | 1298 "Chunk should be free"); |
1299 } | |
1300 return ct; | |
1301 } | |
1302 | |
1303 // Note: this helper is recursive rather than iterative, so use with | |
1304 // caution on very deep trees; and watch out for stack overflow errors; | |
1305 // In general, to be used only for debugging. | |
6026 | 1306 template <class Chunk> |
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1307 void BinaryTreeDictionary<Chunk>::verify_tree_helper(TreeList<Chunk>* tl) const { |
0 | 1308 if (tl == NULL) |
1309 return; | |
1310 guarantee(tl->size() != 0, "A list must has a size"); | |
1311 guarantee(tl->left() == NULL || tl->left()->parent() == tl, | |
1312 "parent<-/->left"); | |
1313 guarantee(tl->right() == NULL || tl->right()->parent() == tl, | |
1314 "parent<-/->right");; | |
1315 guarantee(tl->left() == NULL || tl->left()->size() < tl->size(), | |
1316 "parent !> left"); | |
1317 guarantee(tl->right() == NULL || tl->right()->size() > tl->size(), | |
1318 "parent !< left"); | |
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1319 guarantee(tl->head() == NULL || tl->head()->is_free(), "!Free"); |
0 | 1320 guarantee(tl->head() == NULL || tl->head_as_TreeChunk()->list() == tl, |
1321 "list inconsistency"); | |
1322 guarantee(tl->count() > 0 || (tl->head() == NULL && tl->tail() == NULL), | |
1323 "list count is inconsistent"); | |
1324 guarantee(tl->count() > 1 || tl->head() == tl->tail(), | |
1325 "list is incorrectly constructed"); | |
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1326 size_t count = verify_prev_free_ptrs(tl); |
0 | 1327 guarantee(count == (size_t)tl->count(), "Node count is incorrect"); |
1328 if (tl->head() != NULL) { | |
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1329 tl->head_as_TreeChunk()->verify_tree_chunk_list(); |
0 | 1330 } |
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1331 verify_tree_helper(tl->left()); |
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1332 verify_tree_helper(tl->right()); |
0 | 1333 } |
1334 | |
6026 | 1335 template <class Chunk> |
1336 void BinaryTreeDictionary<Chunk>::verify() const { | |
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1337 verify_tree(); |
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1338 guarantee(total_size() == total_size_in_tree(root()), "Total Size inconsistency"); |
0 | 1339 } |
6026 | 1340 |
1341 #ifndef SERIALGC | |
1342 // Explicitly instantiate these types for FreeChunk. | |
1343 template class BinaryTreeDictionary<FreeChunk>; | |
1344 template class TreeChunk<FreeChunk>; | |
1345 template class TreeList<FreeChunk>; | |
1346 #endif // SERIALGC |