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annotate src/share/vm/gc_implementation/concurrentMarkSweep/binaryTreeDictionary.cpp @ 1562:dfe27f03244a
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0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_binaryTreeDictionary.cpp.incl" | |
27 | |
28 //////////////////////////////////////////////////////////////////////////////// | |
29 // A binary tree based search structure for free blocks. | |
30 // This is currently used in the Concurrent Mark&Sweep implementation. | |
31 //////////////////////////////////////////////////////////////////////////////// | |
32 | |
33 TreeChunk* TreeChunk::as_TreeChunk(FreeChunk* fc) { | |
34 // Do some assertion checking here. | |
35 return (TreeChunk*) fc; | |
36 } | |
37 | |
38 void TreeChunk::verifyTreeChunkList() const { | |
39 TreeChunk* nextTC = (TreeChunk*)next(); | |
40 if (prev() != NULL) { // interior list node shouldn'r have tree fields | |
41 guarantee(embedded_list()->parent() == NULL && embedded_list()->left() == NULL && | |
42 embedded_list()->right() == NULL, "should be clear"); | |
43 } | |
44 if (nextTC != NULL) { | |
45 guarantee(as_TreeChunk(nextTC->prev()) == this, "broken chain"); | |
46 guarantee(nextTC->size() == size(), "wrong size"); | |
47 nextTC->verifyTreeChunkList(); | |
48 } | |
49 } | |
50 | |
51 | |
52 TreeList* TreeList::as_TreeList(TreeChunk* tc) { | |
53 // This first free chunk in the list will be the tree list. | |
54 assert(tc->size() >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk"); | |
55 TreeList* tl = tc->embedded_list(); | |
56 tc->set_list(tl); | |
57 #ifdef ASSERT | |
58 tl->set_protecting_lock(NULL); | |
59 #endif | |
60 tl->set_hint(0); | |
61 tl->set_size(tc->size()); | |
62 tl->link_head(tc); | |
63 tl->link_tail(tc); | |
64 tl->set_count(1); | |
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65 tl->init_statistics(true /* split_birth */); |
0 | 66 tl->setParent(NULL); |
67 tl->setLeft(NULL); | |
68 tl->setRight(NULL); | |
69 return tl; | |
70 } | |
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71 |
0 | 72 TreeList* TreeList::as_TreeList(HeapWord* addr, size_t size) { |
73 TreeChunk* tc = (TreeChunk*) addr; | |
74 assert(size >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk"); | |
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75 // The space in the heap will have been mangled initially but |
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76 // is not remangled when a free chunk is returned to the free list |
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77 // (since it is used to maintain the chunk on the free list). |
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78 assert((ZapUnusedHeapArea && |
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79 SpaceMangler::is_mangled((HeapWord*) tc->size_addr()) && |
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80 SpaceMangler::is_mangled((HeapWord*) tc->prev_addr()) && |
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81 SpaceMangler::is_mangled((HeapWord*) tc->next_addr())) || |
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82 (tc->size() == 0 && tc->prev() == NULL && tc->next() == NULL), |
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83 "Space should be clear or mangled"); |
0 | 84 tc->setSize(size); |
85 tc->linkPrev(NULL); | |
86 tc->linkNext(NULL); | |
87 TreeList* tl = TreeList::as_TreeList(tc); | |
88 return tl; | |
89 } | |
90 | |
91 TreeList* TreeList::removeChunkReplaceIfNeeded(TreeChunk* tc) { | |
92 | |
93 TreeList* retTL = this; | |
94 FreeChunk* list = head(); | |
95 assert(!list || list != list->next(), "Chunk on list twice"); | |
96 assert(tc != NULL, "Chunk being removed is NULL"); | |
97 assert(parent() == NULL || this == parent()->left() || | |
98 this == parent()->right(), "list is inconsistent"); | |
99 assert(tc->isFree(), "Header is not marked correctly"); | |
100 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
101 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
102 | |
103 FreeChunk* prevFC = tc->prev(); | |
104 TreeChunk* nextTC = TreeChunk::as_TreeChunk(tc->next()); | |
105 assert(list != NULL, "should have at least the target chunk"); | |
106 | |
107 // Is this the first item on the list? | |
108 if (tc == list) { | |
109 // The "getChunk..." functions for a TreeList will not return the | |
110 // first chunk in the list unless it is the last chunk in the list | |
111 // because the first chunk is also acting as the tree node. | |
112 // When coalescing happens, however, the first chunk in the a tree | |
113 // list can be the start of a free range. Free ranges are removed | |
114 // from the free lists so that they are not available to be | |
115 // allocated when the sweeper yields (giving up the free list lock) | |
116 // to allow mutator activity. If this chunk is the first in the | |
117 // list and is not the last in the list, do the work to copy the | |
118 // TreeList from the first chunk to the next chunk and update all | |
119 // the TreeList pointers in the chunks in the list. | |
120 if (nextTC == NULL) { | |
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121 assert(prevFC == NULL, "Not last chunk in the list"); |
0 | 122 set_tail(NULL); |
123 set_head(NULL); | |
124 } else { | |
125 // copy embedded list. | |
126 nextTC->set_embedded_list(tc->embedded_list()); | |
127 retTL = nextTC->embedded_list(); | |
128 // Fix the pointer to the list in each chunk in the list. | |
129 // This can be slow for a long list. Consider having | |
130 // an option that does not allow the first chunk on the | |
131 // list to be coalesced. | |
132 for (TreeChunk* curTC = nextTC; curTC != NULL; | |
133 curTC = TreeChunk::as_TreeChunk(curTC->next())) { | |
134 curTC->set_list(retTL); | |
135 } | |
136 // Fix the parent to point to the new TreeList. | |
137 if (retTL->parent() != NULL) { | |
138 if (this == retTL->parent()->left()) { | |
139 retTL->parent()->setLeft(retTL); | |
140 } else { | |
141 assert(this == retTL->parent()->right(), "Parent is incorrect"); | |
142 retTL->parent()->setRight(retTL); | |
143 } | |
144 } | |
145 // Fix the children's parent pointers to point to the | |
146 // new list. | |
147 assert(right() == retTL->right(), "Should have been copied"); | |
148 if (retTL->right() != NULL) { | |
149 retTL->right()->setParent(retTL); | |
150 } | |
151 assert(left() == retTL->left(), "Should have been copied"); | |
152 if (retTL->left() != NULL) { | |
153 retTL->left()->setParent(retTL); | |
154 } | |
155 retTL->link_head(nextTC); | |
156 assert(nextTC->isFree(), "Should be a free chunk"); | |
157 } | |
158 } else { | |
159 if (nextTC == NULL) { | |
160 // Removing chunk at tail of list | |
161 link_tail(prevFC); | |
162 } | |
163 // Chunk is interior to the list | |
164 prevFC->linkAfter(nextTC); | |
165 } | |
166 | |
167 // Below this point the embeded TreeList being used for the | |
168 // tree node may have changed. Don't use "this" | |
169 // TreeList*. | |
170 // chunk should still be a free chunk (bit set in _prev) | |
171 assert(!retTL->head() || retTL->size() == retTL->head()->size(), | |
172 "Wrong sized chunk in list"); | |
173 debug_only( | |
174 tc->linkPrev(NULL); | |
175 tc->linkNext(NULL); | |
176 tc->set_list(NULL); | |
177 bool prev_found = false; | |
178 bool next_found = false; | |
179 for (FreeChunk* curFC = retTL->head(); | |
180 curFC != NULL; curFC = curFC->next()) { | |
181 assert(curFC != tc, "Chunk is still in list"); | |
182 if (curFC == prevFC) { | |
183 prev_found = true; | |
184 } | |
185 if (curFC == nextTC) { | |
186 next_found = true; | |
187 } | |
188 } | |
189 assert(prevFC == NULL || prev_found, "Chunk was lost from list"); | |
190 assert(nextTC == NULL || next_found, "Chunk was lost from list"); | |
191 assert(retTL->parent() == NULL || | |
192 retTL == retTL->parent()->left() || | |
193 retTL == retTL->parent()->right(), | |
194 "list is inconsistent"); | |
195 ) | |
196 retTL->decrement_count(); | |
197 | |
198 assert(tc->isFree(), "Should still be a free chunk"); | |
199 assert(retTL->head() == NULL || retTL->head()->prev() == NULL, | |
200 "list invariant"); | |
201 assert(retTL->tail() == NULL || retTL->tail()->next() == NULL, | |
202 "list invariant"); | |
203 return retTL; | |
204 } | |
205 void TreeList::returnChunkAtTail(TreeChunk* chunk) { | |
206 assert(chunk != NULL, "returning NULL chunk"); | |
207 assert(chunk->list() == this, "list should be set for chunk"); | |
208 assert(tail() != NULL, "The tree list is embedded in the first chunk"); | |
209 // which means that the list can never be empty. | |
210 assert(!verifyChunkInFreeLists(chunk), "Double entry"); | |
211 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
212 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
213 | |
214 FreeChunk* fc = tail(); | |
215 fc->linkAfter(chunk); | |
216 link_tail(chunk); | |
217 | |
218 assert(!tail() || size() == tail()->size(), "Wrong sized chunk in list"); | |
219 increment_count(); | |
220 debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));) | |
221 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
222 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
223 } | |
224 | |
225 // Add this chunk at the head of the list. "At the head of the list" | |
226 // is defined to be after the chunk pointer to by head(). This is | |
227 // because the TreeList is embedded in the first TreeChunk in the | |
228 // list. See the definition of TreeChunk. | |
229 void TreeList::returnChunkAtHead(TreeChunk* chunk) { | |
230 assert(chunk->list() == this, "list should be set for chunk"); | |
231 assert(head() != NULL, "The tree list is embedded in the first chunk"); | |
232 assert(chunk != NULL, "returning NULL chunk"); | |
233 assert(!verifyChunkInFreeLists(chunk), "Double entry"); | |
234 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
235 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
236 | |
237 FreeChunk* fc = head()->next(); | |
238 if (fc != NULL) { | |
239 chunk->linkAfter(fc); | |
240 } else { | |
241 assert(tail() == NULL, "List is inconsistent"); | |
242 link_tail(chunk); | |
243 } | |
244 head()->linkAfter(chunk); | |
245 assert(!head() || size() == head()->size(), "Wrong sized chunk in list"); | |
246 increment_count(); | |
247 debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));) | |
248 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
249 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
250 } | |
251 | |
252 TreeChunk* TreeList::head_as_TreeChunk() { | |
253 assert(head() == NULL || TreeChunk::as_TreeChunk(head())->list() == this, | |
254 "Wrong type of chunk?"); | |
255 return TreeChunk::as_TreeChunk(head()); | |
256 } | |
257 | |
258 TreeChunk* TreeList::first_available() { | |
259 guarantee(head() != NULL, "The head of the list cannot be NULL"); | |
260 FreeChunk* fc = head()->next(); | |
261 TreeChunk* retTC; | |
262 if (fc == NULL) { | |
263 retTC = head_as_TreeChunk(); | |
264 } else { | |
265 retTC = TreeChunk::as_TreeChunk(fc); | |
266 } | |
267 assert(retTC->list() == this, "Wrong type of chunk."); | |
268 return retTC; | |
269 } | |
270 | |
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271 // Returns the block with the largest heap address amongst |
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272 // those in the list for this size; potentially slow and expensive, |
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273 // use with caution! |
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274 TreeChunk* TreeList::largest_address() { |
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275 guarantee(head() != NULL, "The head of the list cannot be NULL"); |
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276 FreeChunk* fc = head()->next(); |
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277 TreeChunk* retTC; |
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278 if (fc == NULL) { |
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279 retTC = head_as_TreeChunk(); |
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280 } else { |
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281 // walk down the list and return the one with the highest |
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282 // heap address among chunks of this size. |
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283 FreeChunk* last = fc; |
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284 while (fc->next() != NULL) { |
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285 if ((HeapWord*)last < (HeapWord*)fc) { |
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286 last = fc; |
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287 } |
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288 fc = fc->next(); |
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289 } |
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290 retTC = TreeChunk::as_TreeChunk(last); |
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291 } |
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292 assert(retTC->list() == this, "Wrong type of chunk."); |
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293 return retTC; |
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294 } |
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295 |
0 | 296 BinaryTreeDictionary::BinaryTreeDictionary(MemRegion mr, bool splay): |
297 _splay(splay) | |
298 { | |
299 assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
300 | |
301 reset(mr); | |
302 assert(root()->left() == NULL, "reset check failed"); | |
303 assert(root()->right() == NULL, "reset check failed"); | |
304 assert(root()->head()->next() == NULL, "reset check failed"); | |
305 assert(root()->head()->prev() == NULL, "reset check failed"); | |
306 assert(totalSize() == root()->size(), "reset check failed"); | |
307 assert(totalFreeBlocks() == 1, "reset check failed"); | |
308 } | |
309 | |
310 void BinaryTreeDictionary::inc_totalSize(size_t inc) { | |
311 _totalSize = _totalSize + inc; | |
312 } | |
313 | |
314 void BinaryTreeDictionary::dec_totalSize(size_t dec) { | |
315 _totalSize = _totalSize - dec; | |
316 } | |
317 | |
318 void BinaryTreeDictionary::reset(MemRegion mr) { | |
319 assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
320 set_root(TreeList::as_TreeList(mr.start(), mr.word_size())); | |
321 set_totalSize(mr.word_size()); | |
322 set_totalFreeBlocks(1); | |
323 } | |
324 | |
325 void BinaryTreeDictionary::reset(HeapWord* addr, size_t byte_size) { | |
326 MemRegion mr(addr, heap_word_size(byte_size)); | |
327 reset(mr); | |
328 } | |
329 | |
330 void BinaryTreeDictionary::reset() { | |
331 set_root(NULL); | |
332 set_totalSize(0); | |
333 set_totalFreeBlocks(0); | |
334 } | |
335 | |
336 // Get a free block of size at least size from tree, or NULL. | |
337 // If a splay step is requested, the removal algorithm (only) incorporates | |
338 // a splay step as follows: | |
339 // . the search proceeds down the tree looking for a possible | |
340 // match. At the (closest) matching location, an appropriate splay step is applied | |
341 // (zig, zig-zig or zig-zag). A chunk of the appropriate size is then returned | |
342 // if available, and if it's the last chunk, the node is deleted. A deteleted | |
343 // node is replaced in place by its tree successor. | |
344 TreeChunk* | |
345 BinaryTreeDictionary::getChunkFromTree(size_t size, Dither dither, bool splay) | |
346 { | |
347 TreeList *curTL, *prevTL; | |
348 TreeChunk* retTC = NULL; | |
349 assert(size >= MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
350 if (FLSVerifyDictionary) { | |
351 verifyTree(); | |
352 } | |
353 // starting at the root, work downwards trying to find match. | |
354 // Remember the last node of size too great or too small. | |
355 for (prevTL = curTL = root(); curTL != NULL;) { | |
356 if (curTL->size() == size) { // exact match | |
357 break; | |
358 } | |
359 prevTL = curTL; | |
360 if (curTL->size() < size) { // proceed to right sub-tree | |
361 curTL = curTL->right(); | |
362 } else { // proceed to left sub-tree | |
363 assert(curTL->size() > size, "size inconsistency"); | |
364 curTL = curTL->left(); | |
365 } | |
366 } | |
367 if (curTL == NULL) { // couldn't find exact match | |
368 // try and find the next larger size by walking back up the search path | |
369 for (curTL = prevTL; curTL != NULL;) { | |
370 if (curTL->size() >= size) break; | |
371 else curTL = curTL->parent(); | |
372 } | |
373 assert(curTL == NULL || curTL->count() > 0, | |
374 "An empty list should not be in the tree"); | |
375 } | |
376 if (curTL != NULL) { | |
377 assert(curTL->size() >= size, "size inconsistency"); | |
378 if (UseCMSAdaptiveFreeLists) { | |
379 | |
380 // A candidate chunk has been found. If it is already under | |
381 // populated, get a chunk associated with the hint for this | |
382 // chunk. | |
383 if (curTL->surplus() <= 0) { | |
384 /* Use the hint to find a size with a surplus, and reset the hint. */ | |
385 TreeList* hintTL = curTL; | |
386 while (hintTL->hint() != 0) { | |
387 assert(hintTL->hint() == 0 || hintTL->hint() > hintTL->size(), | |
388 "hint points in the wrong direction"); | |
389 hintTL = findList(hintTL->hint()); | |
390 assert(curTL != hintTL, "Infinite loop"); | |
391 if (hintTL == NULL || | |
392 hintTL == curTL /* Should not happen but protect against it */ ) { | |
393 // No useful hint. Set the hint to NULL and go on. | |
394 curTL->set_hint(0); | |
395 break; | |
396 } | |
397 assert(hintTL->size() > size, "hint is inconsistent"); | |
398 if (hintTL->surplus() > 0) { | |
399 // The hint led to a list that has a surplus. Use it. | |
400 // Set the hint for the candidate to an overpopulated | |
401 // size. | |
402 curTL->set_hint(hintTL->size()); | |
403 // Change the candidate. | |
404 curTL = hintTL; | |
405 break; | |
406 } | |
407 // The evm code reset the hint of the candidate as | |
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408 // at an interim point. Why? Seems like this leaves |
0 | 409 // the hint pointing to a list that didn't work. |
410 // curTL->set_hint(hintTL->size()); | |
411 } | |
412 } | |
413 } | |
414 // don't waste time splaying if chunk's singleton | |
415 if (splay && curTL->head()->next() != NULL) { | |
416 semiSplayStep(curTL); | |
417 } | |
418 retTC = curTL->first_available(); | |
419 assert((retTC != NULL) && (curTL->count() > 0), | |
420 "A list in the binary tree should not be NULL"); | |
421 assert(retTC->size() >= size, | |
422 "A chunk of the wrong size was found"); | |
423 removeChunkFromTree(retTC); | |
424 assert(retTC->isFree(), "Header is not marked correctly"); | |
425 } | |
426 | |
427 if (FLSVerifyDictionary) { | |
428 verify(); | |
429 } | |
430 return retTC; | |
431 } | |
432 | |
433 TreeList* BinaryTreeDictionary::findList(size_t size) const { | |
434 TreeList* curTL; | |
435 for (curTL = root(); curTL != NULL;) { | |
436 if (curTL->size() == size) { // exact match | |
437 break; | |
438 } | |
439 | |
440 if (curTL->size() < size) { // proceed to right sub-tree | |
441 curTL = curTL->right(); | |
442 } else { // proceed to left sub-tree | |
443 assert(curTL->size() > size, "size inconsistency"); | |
444 curTL = curTL->left(); | |
445 } | |
446 } | |
447 return curTL; | |
448 } | |
449 | |
450 | |
451 bool BinaryTreeDictionary::verifyChunkInFreeLists(FreeChunk* tc) const { | |
452 size_t size = tc->size(); | |
453 TreeList* tl = findList(size); | |
454 if (tl == NULL) { | |
455 return false; | |
456 } else { | |
457 return tl->verifyChunkInFreeLists(tc); | |
458 } | |
459 } | |
460 | |
461 FreeChunk* BinaryTreeDictionary::findLargestDict() const { | |
462 TreeList *curTL = root(); | |
463 if (curTL != NULL) { | |
464 while(curTL->right() != NULL) curTL = curTL->right(); | |
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465 return curTL->largest_address(); |
0 | 466 } else { |
467 return NULL; | |
468 } | |
469 } | |
470 | |
471 // Remove the current chunk from the tree. If it is not the last | |
472 // chunk in a list on a tree node, just unlink it. | |
473 // If it is the last chunk in the list (the next link is NULL), | |
474 // remove the node and repair the tree. | |
475 TreeChunk* | |
476 BinaryTreeDictionary::removeChunkFromTree(TreeChunk* tc) { | |
477 assert(tc != NULL, "Should not call with a NULL chunk"); | |
478 assert(tc->isFree(), "Header is not marked correctly"); | |
479 | |
480 TreeList *newTL, *parentTL; | |
481 TreeChunk* retTC; | |
482 TreeList* tl = tc->list(); | |
483 debug_only( | |
484 bool removing_only_chunk = false; | |
485 if (tl == _root) { | |
486 if ((_root->left() == NULL) && (_root->right() == NULL)) { | |
487 if (_root->count() == 1) { | |
488 assert(_root->head() == tc, "Should only be this one chunk"); | |
489 removing_only_chunk = true; | |
490 } | |
491 } | |
492 } | |
493 ) | |
494 assert(tl != NULL, "List should be set"); | |
495 assert(tl->parent() == NULL || tl == tl->parent()->left() || | |
496 tl == tl->parent()->right(), "list is inconsistent"); | |
497 | |
498 bool complicatedSplice = false; | |
499 | |
500 retTC = tc; | |
501 // Removing this chunk can have the side effect of changing the node | |
502 // (TreeList*) in the tree. If the node is the root, update it. | |
503 TreeList* replacementTL = tl->removeChunkReplaceIfNeeded(tc); | |
504 assert(tc->isFree(), "Chunk should still be free"); | |
505 assert(replacementTL->parent() == NULL || | |
506 replacementTL == replacementTL->parent()->left() || | |
507 replacementTL == replacementTL->parent()->right(), | |
508 "list is inconsistent"); | |
509 if (tl == root()) { | |
510 assert(replacementTL->parent() == NULL, "Incorrectly replacing root"); | |
511 set_root(replacementTL); | |
512 } | |
513 debug_only( | |
514 if (tl != replacementTL) { | |
515 assert(replacementTL->head() != NULL, | |
516 "If the tree list was replaced, it should not be a NULL list"); | |
517 TreeList* rhl = replacementTL->head_as_TreeChunk()->list(); | |
518 TreeList* rtl = TreeChunk::as_TreeChunk(replacementTL->tail())->list(); | |
519 assert(rhl == replacementTL, "Broken head"); | |
520 assert(rtl == replacementTL, "Broken tail"); | |
521 assert(replacementTL->size() == tc->size(), "Broken size"); | |
522 } | |
523 ) | |
524 | |
525 // Does the tree need to be repaired? | |
526 if (replacementTL->count() == 0) { | |
527 assert(replacementTL->head() == NULL && | |
528 replacementTL->tail() == NULL, "list count is incorrect"); | |
529 // Find the replacement node for the (soon to be empty) node being removed. | |
530 // if we have a single (or no) child, splice child in our stead | |
531 if (replacementTL->left() == NULL) { | |
532 // left is NULL so pick right. right may also be NULL. | |
533 newTL = replacementTL->right(); | |
534 debug_only(replacementTL->clearRight();) | |
535 } else if (replacementTL->right() == NULL) { | |
536 // right is NULL | |
537 newTL = replacementTL->left(); | |
538 debug_only(replacementTL->clearLeft();) | |
539 } else { // we have both children, so, by patriarchal convention, | |
540 // my replacement is least node in right sub-tree | |
541 complicatedSplice = true; | |
542 newTL = removeTreeMinimum(replacementTL->right()); | |
543 assert(newTL != NULL && newTL->left() == NULL && | |
544 newTL->right() == NULL, "sub-tree minimum exists"); | |
545 } | |
546 // newTL is the replacement for the (soon to be empty) node. | |
547 // newTL may be NULL. | |
548 // should verify; we just cleanly excised our replacement | |
549 if (FLSVerifyDictionary) { | |
550 verifyTree(); | |
551 } | |
552 // first make newTL my parent's child | |
553 if ((parentTL = replacementTL->parent()) == NULL) { | |
554 // newTL should be root | |
555 assert(tl == root(), "Incorrectly replacing root"); | |
556 set_root(newTL); | |
557 if (newTL != NULL) { | |
558 newTL->clearParent(); | |
559 } | |
560 } else if (parentTL->right() == replacementTL) { | |
561 // replacementTL is a right child | |
562 parentTL->setRight(newTL); | |
563 } else { // replacementTL is a left child | |
564 assert(parentTL->left() == replacementTL, "should be left child"); | |
565 parentTL->setLeft(newTL); | |
566 } | |
567 debug_only(replacementTL->clearParent();) | |
568 if (complicatedSplice) { // we need newTL to get replacementTL's | |
569 // two children | |
570 assert(newTL != NULL && | |
571 newTL->left() == NULL && newTL->right() == NULL, | |
572 "newTL should not have encumbrances from the past"); | |
573 // we'd like to assert as below: | |
574 // assert(replacementTL->left() != NULL && replacementTL->right() != NULL, | |
575 // "else !complicatedSplice"); | |
576 // ... however, the above assertion is too strong because we aren't | |
577 // guaranteed that replacementTL->right() is still NULL. | |
578 // Recall that we removed | |
579 // the right sub-tree minimum from replacementTL. | |
580 // That may well have been its right | |
581 // child! So we'll just assert half of the above: | |
582 assert(replacementTL->left() != NULL, "else !complicatedSplice"); | |
583 newTL->setLeft(replacementTL->left()); | |
584 newTL->setRight(replacementTL->right()); | |
585 debug_only( | |
586 replacementTL->clearRight(); | |
587 replacementTL->clearLeft(); | |
588 ) | |
589 } | |
590 assert(replacementTL->right() == NULL && | |
591 replacementTL->left() == NULL && | |
592 replacementTL->parent() == NULL, | |
593 "delete without encumbrances"); | |
594 } | |
595 | |
596 assert(totalSize() >= retTC->size(), "Incorrect total size"); | |
597 dec_totalSize(retTC->size()); // size book-keeping | |
598 assert(totalFreeBlocks() > 0, "Incorrect total count"); | |
599 set_totalFreeBlocks(totalFreeBlocks() - 1); | |
600 | |
601 assert(retTC != NULL, "null chunk?"); | |
602 assert(retTC->prev() == NULL && retTC->next() == NULL, | |
603 "should return without encumbrances"); | |
604 if (FLSVerifyDictionary) { | |
605 verifyTree(); | |
606 } | |
607 assert(!removing_only_chunk || _root == NULL, "root should be NULL"); | |
608 return TreeChunk::as_TreeChunk(retTC); | |
609 } | |
610 | |
611 // Remove the leftmost node (lm) in the tree and return it. | |
612 // If lm has a right child, link it to the left node of | |
613 // the parent of lm. | |
614 TreeList* BinaryTreeDictionary::removeTreeMinimum(TreeList* tl) { | |
615 assert(tl != NULL && tl->parent() != NULL, "really need a proper sub-tree"); | |
616 // locate the subtree minimum by walking down left branches | |
617 TreeList* curTL = tl; | |
618 for (; curTL->left() != NULL; curTL = curTL->left()); | |
619 // obviously curTL now has at most one child, a right child | |
620 if (curTL != root()) { // Should this test just be removed? | |
621 TreeList* parentTL = curTL->parent(); | |
622 if (parentTL->left() == curTL) { // curTL is a left child | |
623 parentTL->setLeft(curTL->right()); | |
624 } else { | |
625 // If the list tl has no left child, then curTL may be | |
626 // the right child of parentTL. | |
627 assert(parentTL->right() == curTL, "should be a right child"); | |
628 parentTL->setRight(curTL->right()); | |
629 } | |
630 } else { | |
631 // The only use of this method would not pass the root of the | |
632 // tree (as indicated by the assertion above that the tree list | |
633 // has a parent) but the specification does not explicitly exclude the | |
634 // passing of the root so accomodate it. | |
635 set_root(NULL); | |
636 } | |
637 debug_only( | |
638 curTL->clearParent(); // Test if this needs to be cleared | |
639 curTL->clearRight(); // recall, above, left child is already null | |
640 ) | |
641 // we just excised a (non-root) node, we should still verify all tree invariants | |
642 if (FLSVerifyDictionary) { | |
643 verifyTree(); | |
644 } | |
645 return curTL; | |
646 } | |
647 | |
648 // Based on a simplification of the algorithm by Sleator and Tarjan (JACM 1985). | |
649 // The simplifications are the following: | |
650 // . we splay only when we delete (not when we insert) | |
651 // . we apply a single spay step per deletion/access | |
652 // By doing such partial splaying, we reduce the amount of restructuring, | |
653 // while getting a reasonably efficient search tree (we think). | |
654 // [Measurements will be needed to (in)validate this expectation.] | |
655 | |
656 void BinaryTreeDictionary::semiSplayStep(TreeList* tc) { | |
657 // apply a semi-splay step at the given node: | |
658 // . if root, norting needs to be done | |
659 // . if child of root, splay once | |
660 // . else zig-zig or sig-zag depending on path from grandparent | |
661 if (root() == tc) return; | |
662 warning("*** Splaying not yet implemented; " | |
663 "tree operations may be inefficient ***"); | |
664 } | |
665 | |
666 void BinaryTreeDictionary::insertChunkInTree(FreeChunk* fc) { | |
667 TreeList *curTL, *prevTL; | |
668 size_t size = fc->size(); | |
669 | |
670 assert(size >= MIN_TREE_CHUNK_SIZE, "too small to be a TreeList"); | |
671 if (FLSVerifyDictionary) { | |
672 verifyTree(); | |
673 } | |
674 // XXX: do i need to clear the FreeChunk fields, let me do it just in case | |
675 // Revisit this later | |
676 | |
677 fc->clearNext(); | |
678 fc->linkPrev(NULL); | |
679 | |
680 // work down from the _root, looking for insertion point | |
681 for (prevTL = curTL = root(); curTL != NULL;) { | |
682 if (curTL->size() == size) // exact match | |
683 break; | |
684 prevTL = curTL; | |
685 if (curTL->size() > size) { // follow left branch | |
686 curTL = curTL->left(); | |
687 } else { // follow right branch | |
688 assert(curTL->size() < size, "size inconsistency"); | |
689 curTL = curTL->right(); | |
690 } | |
691 } | |
692 TreeChunk* tc = TreeChunk::as_TreeChunk(fc); | |
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693 // This chunk is being returned to the binary tree. Its embedded |
0 | 694 // TreeList should be unused at this point. |
695 tc->initialize(); | |
696 if (curTL != NULL) { // exact match | |
697 tc->set_list(curTL); | |
698 curTL->returnChunkAtTail(tc); | |
699 } else { // need a new node in tree | |
700 tc->clearNext(); | |
701 tc->linkPrev(NULL); | |
702 TreeList* newTL = TreeList::as_TreeList(tc); | |
703 assert(((TreeChunk*)tc)->list() == newTL, | |
704 "List was not initialized correctly"); | |
705 if (prevTL == NULL) { // we are the only tree node | |
706 assert(root() == NULL, "control point invariant"); | |
707 set_root(newTL); | |
708 } else { // insert under prevTL ... | |
709 if (prevTL->size() < size) { // am right child | |
710 assert(prevTL->right() == NULL, "control point invariant"); | |
711 prevTL->setRight(newTL); | |
712 } else { // am left child | |
713 assert(prevTL->size() > size && prevTL->left() == NULL, "cpt pt inv"); | |
714 prevTL->setLeft(newTL); | |
715 } | |
716 } | |
717 } | |
718 assert(tc->list() != NULL, "Tree list should be set"); | |
719 | |
720 inc_totalSize(size); | |
721 // Method 'totalSizeInTree' walks through the every block in the | |
722 // tree, so it can cause significant performance loss if there are | |
723 // many blocks in the tree | |
724 assert(!FLSVerifyDictionary || totalSizeInTree(root()) == totalSize(), "_totalSize inconsistency"); | |
725 set_totalFreeBlocks(totalFreeBlocks() + 1); | |
726 if (FLSVerifyDictionary) { | |
727 verifyTree(); | |
728 } | |
729 } | |
730 | |
731 size_t BinaryTreeDictionary::maxChunkSize() const { | |
732 verify_par_locked(); | |
733 TreeList* tc = root(); | |
734 if (tc == NULL) return 0; | |
735 for (; tc->right() != NULL; tc = tc->right()); | |
736 return tc->size(); | |
737 } | |
738 | |
739 size_t BinaryTreeDictionary::totalListLength(TreeList* tl) const { | |
740 size_t res; | |
741 res = tl->count(); | |
742 #ifdef ASSERT | |
743 size_t cnt; | |
744 FreeChunk* tc = tl->head(); | |
745 for (cnt = 0; tc != NULL; tc = tc->next(), cnt++); | |
746 assert(res == cnt, "The count is not being maintained correctly"); | |
747 #endif | |
748 return res; | |
749 } | |
750 | |
751 size_t BinaryTreeDictionary::totalSizeInTree(TreeList* tl) const { | |
752 if (tl == NULL) | |
753 return 0; | |
754 return (tl->size() * totalListLength(tl)) + | |
755 totalSizeInTree(tl->left()) + | |
756 totalSizeInTree(tl->right()); | |
757 } | |
758 | |
759 double BinaryTreeDictionary::sum_of_squared_block_sizes(TreeList* const tl) const { | |
760 if (tl == NULL) { | |
761 return 0.0; | |
762 } | |
763 double size = (double)(tl->size()); | |
764 double curr = size * size * totalListLength(tl); | |
765 curr += sum_of_squared_block_sizes(tl->left()); | |
766 curr += sum_of_squared_block_sizes(tl->right()); | |
767 return curr; | |
768 } | |
769 | |
770 size_t BinaryTreeDictionary::totalFreeBlocksInTree(TreeList* tl) const { | |
771 if (tl == NULL) | |
772 return 0; | |
773 return totalListLength(tl) + | |
774 totalFreeBlocksInTree(tl->left()) + | |
775 totalFreeBlocksInTree(tl->right()); | |
776 } | |
777 | |
778 size_t BinaryTreeDictionary::numFreeBlocks() const { | |
779 assert(totalFreeBlocksInTree(root()) == totalFreeBlocks(), | |
780 "_totalFreeBlocks inconsistency"); | |
781 return totalFreeBlocks(); | |
782 } | |
783 | |
784 size_t BinaryTreeDictionary::treeHeightHelper(TreeList* tl) const { | |
785 if (tl == NULL) | |
786 return 0; | |
787 return 1 + MAX2(treeHeightHelper(tl->left()), | |
788 treeHeightHelper(tl->right())); | |
789 } | |
790 | |
791 size_t BinaryTreeDictionary::treeHeight() const { | |
792 return treeHeightHelper(root()); | |
793 } | |
794 | |
795 size_t BinaryTreeDictionary::totalNodesHelper(TreeList* tl) const { | |
796 if (tl == NULL) { | |
797 return 0; | |
798 } | |
799 return 1 + totalNodesHelper(tl->left()) + | |
800 totalNodesHelper(tl->right()); | |
801 } | |
802 | |
803 size_t BinaryTreeDictionary::totalNodesInTree(TreeList* tl) const { | |
804 return totalNodesHelper(root()); | |
805 } | |
806 | |
807 void BinaryTreeDictionary::dictCensusUpdate(size_t size, bool split, bool birth){ | |
808 TreeList* nd = findList(size); | |
809 if (nd) { | |
810 if (split) { | |
811 if (birth) { | |
812 nd->increment_splitBirths(); | |
813 nd->increment_surplus(); | |
814 } else { | |
815 nd->increment_splitDeaths(); | |
816 nd->decrement_surplus(); | |
817 } | |
818 } else { | |
819 if (birth) { | |
820 nd->increment_coalBirths(); | |
821 nd->increment_surplus(); | |
822 } else { | |
823 nd->increment_coalDeaths(); | |
824 nd->decrement_surplus(); | |
825 } | |
826 } | |
827 } | |
828 // A list for this size may not be found (nd == 0) if | |
829 // This is a death where the appropriate list is now | |
830 // empty and has been removed from the list. | |
831 // This is a birth associated with a LinAB. The chunk | |
832 // for the LinAB is not in the dictionary. | |
833 } | |
834 | |
835 bool BinaryTreeDictionary::coalDictOverPopulated(size_t size) { | |
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836 if (FLSAlwaysCoalesceLarge) return true; |
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837 |
0 | 838 TreeList* list_of_size = findList(size); |
839 // None of requested size implies overpopulated. | |
840 return list_of_size == NULL || list_of_size->coalDesired() <= 0 || | |
841 list_of_size->count() > list_of_size->coalDesired(); | |
842 } | |
843 | |
844 // Closures for walking the binary tree. | |
845 // do_list() walks the free list in a node applying the closure | |
846 // to each free chunk in the list | |
847 // do_tree() walks the nodes in the binary tree applying do_list() | |
848 // to each list at each node. | |
849 | |
850 class TreeCensusClosure : public StackObj { | |
851 protected: | |
852 virtual void do_list(FreeList* fl) = 0; | |
853 public: | |
854 virtual void do_tree(TreeList* tl) = 0; | |
855 }; | |
856 | |
857 class AscendTreeCensusClosure : public TreeCensusClosure { | |
858 public: | |
859 void do_tree(TreeList* tl) { | |
860 if (tl != NULL) { | |
861 do_tree(tl->left()); | |
862 do_list(tl); | |
863 do_tree(tl->right()); | |
864 } | |
865 } | |
866 }; | |
867 | |
868 class DescendTreeCensusClosure : public TreeCensusClosure { | |
869 public: | |
870 void do_tree(TreeList* tl) { | |
871 if (tl != NULL) { | |
872 do_tree(tl->right()); | |
873 do_list(tl); | |
874 do_tree(tl->left()); | |
875 } | |
876 } | |
877 }; | |
878 | |
879 // For each list in the tree, calculate the desired, desired | |
880 // coalesce, count before sweep, and surplus before sweep. | |
881 class BeginSweepClosure : public AscendTreeCensusClosure { | |
882 double _percentage; | |
883 float _inter_sweep_current; | |
884 float _inter_sweep_estimate; | |
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885 float _intra_sweep_estimate; |
0 | 886 |
887 public: | |
888 BeginSweepClosure(double p, float inter_sweep_current, | |
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889 float inter_sweep_estimate, |
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890 float intra_sweep_estimate) : |
0 | 891 _percentage(p), |
892 _inter_sweep_current(inter_sweep_current), | |
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893 _inter_sweep_estimate(inter_sweep_estimate), |
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894 _intra_sweep_estimate(intra_sweep_estimate) { } |
0 | 895 |
896 void do_list(FreeList* fl) { | |
897 double coalSurplusPercent = _percentage; | |
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898 fl->compute_desired(_inter_sweep_current, _inter_sweep_estimate, _intra_sweep_estimate); |
0 | 899 fl->set_coalDesired((ssize_t)((double)fl->desired() * coalSurplusPercent)); |
900 fl->set_beforeSweep(fl->count()); | |
901 fl->set_bfrSurp(fl->surplus()); | |
902 } | |
903 }; | |
904 | |
905 // Used to search the tree until a condition is met. | |
906 // Similar to TreeCensusClosure but searches the | |
907 // tree and returns promptly when found. | |
908 | |
909 class TreeSearchClosure : public StackObj { | |
910 protected: | |
911 virtual bool do_list(FreeList* fl) = 0; | |
912 public: | |
913 virtual bool do_tree(TreeList* tl) = 0; | |
914 }; | |
915 | |
916 #if 0 // Don't need this yet but here for symmetry. | |
917 class AscendTreeSearchClosure : public TreeSearchClosure { | |
918 public: | |
919 bool do_tree(TreeList* tl) { | |
920 if (tl != NULL) { | |
921 if (do_tree(tl->left())) return true; | |
922 if (do_list(tl)) return true; | |
923 if (do_tree(tl->right())) return true; | |
924 } | |
925 return false; | |
926 } | |
927 }; | |
928 #endif | |
929 | |
930 class DescendTreeSearchClosure : public TreeSearchClosure { | |
931 public: | |
932 bool do_tree(TreeList* tl) { | |
933 if (tl != NULL) { | |
934 if (do_tree(tl->right())) return true; | |
935 if (do_list(tl)) return true; | |
936 if (do_tree(tl->left())) return true; | |
937 } | |
938 return false; | |
939 } | |
940 }; | |
941 | |
942 // Searches the tree for a chunk that ends at the | |
943 // specified address. | |
944 class EndTreeSearchClosure : public DescendTreeSearchClosure { | |
945 HeapWord* _target; | |
946 FreeChunk* _found; | |
947 | |
948 public: | |
949 EndTreeSearchClosure(HeapWord* target) : _target(target), _found(NULL) {} | |
950 bool do_list(FreeList* fl) { | |
951 FreeChunk* item = fl->head(); | |
952 while (item != NULL) { | |
953 if (item->end() == _target) { | |
954 _found = item; | |
955 return true; | |
956 } | |
957 item = item->next(); | |
958 } | |
959 return false; | |
960 } | |
961 FreeChunk* found() { return _found; } | |
962 }; | |
963 | |
964 FreeChunk* BinaryTreeDictionary::find_chunk_ends_at(HeapWord* target) const { | |
965 EndTreeSearchClosure etsc(target); | |
966 bool found_target = etsc.do_tree(root()); | |
967 assert(found_target || etsc.found() == NULL, "Consistency check"); | |
968 assert(!found_target || etsc.found() != NULL, "Consistency check"); | |
969 return etsc.found(); | |
970 } | |
971 | |
972 void BinaryTreeDictionary::beginSweepDictCensus(double coalSurplusPercent, | |
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973 float inter_sweep_current, float inter_sweep_estimate, float intra_sweep_estimate) { |
0 | 974 BeginSweepClosure bsc(coalSurplusPercent, inter_sweep_current, |
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975 inter_sweep_estimate, |
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976 intra_sweep_estimate); |
0 | 977 bsc.do_tree(root()); |
978 } | |
979 | |
980 // Closures and methods for calculating total bytes returned to the | |
981 // free lists in the tree. | |
982 NOT_PRODUCT( | |
983 class InitializeDictReturnedBytesClosure : public AscendTreeCensusClosure { | |
984 public: | |
985 void do_list(FreeList* fl) { | |
986 fl->set_returnedBytes(0); | |
987 } | |
988 }; | |
989 | |
990 void BinaryTreeDictionary::initializeDictReturnedBytes() { | |
991 InitializeDictReturnedBytesClosure idrb; | |
992 idrb.do_tree(root()); | |
993 } | |
994 | |
995 class ReturnedBytesClosure : public AscendTreeCensusClosure { | |
996 size_t _dictReturnedBytes; | |
997 public: | |
998 ReturnedBytesClosure() { _dictReturnedBytes = 0; } | |
999 void do_list(FreeList* fl) { | |
1000 _dictReturnedBytes += fl->returnedBytes(); | |
1001 } | |
1002 size_t dictReturnedBytes() { return _dictReturnedBytes; } | |
1003 }; | |
1004 | |
1005 size_t BinaryTreeDictionary::sumDictReturnedBytes() { | |
1006 ReturnedBytesClosure rbc; | |
1007 rbc.do_tree(root()); | |
1008 | |
1009 return rbc.dictReturnedBytes(); | |
1010 } | |
1011 | |
1012 // Count the number of entries in the tree. | |
1013 class treeCountClosure : public DescendTreeCensusClosure { | |
1014 public: | |
1015 uint count; | |
1016 treeCountClosure(uint c) { count = c; } | |
1017 void do_list(FreeList* fl) { | |
1018 count++; | |
1019 } | |
1020 }; | |
1021 | |
1022 size_t BinaryTreeDictionary::totalCount() { | |
1023 treeCountClosure ctc(0); | |
1024 ctc.do_tree(root()); | |
1025 return ctc.count; | |
1026 } | |
1027 ) | |
1028 | |
1029 // Calculate surpluses for the lists in the tree. | |
1030 class setTreeSurplusClosure : public AscendTreeCensusClosure { | |
1031 double percentage; | |
1032 public: | |
1033 setTreeSurplusClosure(double v) { percentage = v; } | |
1034 void do_list(FreeList* fl) { | |
1035 double splitSurplusPercent = percentage; | |
1036 fl->set_surplus(fl->count() - | |
1037 (ssize_t)((double)fl->desired() * splitSurplusPercent)); | |
1038 } | |
1039 }; | |
1040 | |
1041 void BinaryTreeDictionary::setTreeSurplus(double splitSurplusPercent) { | |
1042 setTreeSurplusClosure sts(splitSurplusPercent); | |
1043 sts.do_tree(root()); | |
1044 } | |
1045 | |
1046 // Set hints for the lists in the tree. | |
1047 class setTreeHintsClosure : public DescendTreeCensusClosure { | |
1048 size_t hint; | |
1049 public: | |
1050 setTreeHintsClosure(size_t v) { hint = v; } | |
1051 void do_list(FreeList* fl) { | |
1052 fl->set_hint(hint); | |
1053 assert(fl->hint() == 0 || fl->hint() > fl->size(), | |
1054 "Current hint is inconsistent"); | |
1055 if (fl->surplus() > 0) { | |
1056 hint = fl->size(); | |
1057 } | |
1058 } | |
1059 }; | |
1060 | |
1061 void BinaryTreeDictionary::setTreeHints(void) { | |
1062 setTreeHintsClosure sth(0); | |
1063 sth.do_tree(root()); | |
1064 } | |
1065 | |
1066 // Save count before previous sweep and splits and coalesces. | |
1067 class clearTreeCensusClosure : public AscendTreeCensusClosure { | |
1068 void do_list(FreeList* fl) { | |
1069 fl->set_prevSweep(fl->count()); | |
1070 fl->set_coalBirths(0); | |
1071 fl->set_coalDeaths(0); | |
1072 fl->set_splitBirths(0); | |
1073 fl->set_splitDeaths(0); | |
1074 } | |
1075 }; | |
1076 | |
1077 void BinaryTreeDictionary::clearTreeCensus(void) { | |
1078 clearTreeCensusClosure ctc; | |
1079 ctc.do_tree(root()); | |
1080 } | |
1081 | |
1082 // Do reporting and post sweep clean up. | |
1083 void BinaryTreeDictionary::endSweepDictCensus(double splitSurplusPercent) { | |
1084 // Does walking the tree 3 times hurt? | |
1085 setTreeSurplus(splitSurplusPercent); | |
1086 setTreeHints(); | |
1087 if (PrintGC && Verbose) { | |
1088 reportStatistics(); | |
1089 } | |
1090 clearTreeCensus(); | |
1091 } | |
1092 | |
1093 // Print summary statistics | |
1094 void BinaryTreeDictionary::reportStatistics() const { | |
1095 verify_par_locked(); | |
1096 gclog_or_tty->print("Statistics for BinaryTreeDictionary:\n" | |
1097 "------------------------------------\n"); | |
1098 size_t totalSize = totalChunkSize(debug_only(NULL)); | |
1099 size_t freeBlocks = numFreeBlocks(); | |
1100 gclog_or_tty->print("Total Free Space: %d\n", totalSize); | |
1101 gclog_or_tty->print("Max Chunk Size: %d\n", maxChunkSize()); | |
1102 gclog_or_tty->print("Number of Blocks: %d\n", freeBlocks); | |
1103 if (freeBlocks > 0) { | |
1104 gclog_or_tty->print("Av. Block Size: %d\n", totalSize/freeBlocks); | |
1105 } | |
1106 gclog_or_tty->print("Tree Height: %d\n", treeHeight()); | |
1107 } | |
1108 | |
1109 // Print census information - counts, births, deaths, etc. | |
1110 // for each list in the tree. Also print some summary | |
1111 // information. | |
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1112 class PrintTreeCensusClosure : public AscendTreeCensusClosure { |
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1113 int _print_line; |
0 | 1114 size_t _totalFree; |
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1115 FreeList _total; |
0 | 1116 |
1117 public: | |
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1118 PrintTreeCensusClosure() { |
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1119 _print_line = 0; |
0 | 1120 _totalFree = 0; |
1121 } | |
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1122 FreeList* total() { return &_total; } |
0 | 1123 size_t totalFree() { return _totalFree; } |
1124 void do_list(FreeList* fl) { | |
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1125 if (++_print_line >= 40) { |
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1126 FreeList::print_labels_on(gclog_or_tty, "size"); |
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1127 _print_line = 0; |
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1128 } |
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1129 fl->print_on(gclog_or_tty); |
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1130 _totalFree += fl->count() * fl->size() ; |
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1131 total()->set_count( total()->count() + fl->count() ); |
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1132 total()->set_bfrSurp( total()->bfrSurp() + fl->bfrSurp() ); |
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1133 total()->set_surplus( total()->splitDeaths() + fl->surplus() ); |
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1134 total()->set_desired( total()->desired() + fl->desired() ); |
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1135 total()->set_prevSweep( total()->prevSweep() + fl->prevSweep() ); |
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1136 total()->set_beforeSweep(total()->beforeSweep() + fl->beforeSweep()); |
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1137 total()->set_coalBirths( total()->coalBirths() + fl->coalBirths() ); |
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1138 total()->set_coalDeaths( total()->coalDeaths() + fl->coalDeaths() ); |
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1139 total()->set_splitBirths(total()->splitBirths() + fl->splitBirths()); |
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1140 total()->set_splitDeaths(total()->splitDeaths() + fl->splitDeaths()); |
0 | 1141 } |
1142 }; | |
1143 | |
1144 void BinaryTreeDictionary::printDictCensus(void) const { | |
1145 | |
1146 gclog_or_tty->print("\nBinaryTree\n"); | |
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1147 FreeList::print_labels_on(gclog_or_tty, "size"); |
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1148 PrintTreeCensusClosure ptc; |
0 | 1149 ptc.do_tree(root()); |
1150 | |
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1151 FreeList* total = ptc.total(); |
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1152 FreeList::print_labels_on(gclog_or_tty, " "); |
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1153 total->print_on(gclog_or_tty, "TOTAL\t"); |
0 | 1154 gclog_or_tty->print( |
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1155 "totalFree(words): " SIZE_FORMAT_W(16) |
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1156 " growth: %8.5f deficit: %8.5f\n", |
0 | 1157 ptc.totalFree(), |
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1158 (double)(total->splitBirths() + total->coalBirths() |
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1159 - total->splitDeaths() - total->coalDeaths()) |
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1160 /(total->prevSweep() != 0 ? (double)total->prevSweep() : 1.0), |
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1161 (double)(total->desired() - total->count()) |
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1162 /(total->desired() != 0 ? (double)total->desired() : 1.0)); |
0 | 1163 } |
1164 | |
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1165 class PrintFreeListsClosure : public AscendTreeCensusClosure { |
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1166 outputStream* _st; |
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1167 int _print_line; |
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1168 |
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1169 public: |
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1170 PrintFreeListsClosure(outputStream* st) { |
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1171 _st = st; |
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1172 _print_line = 0; |
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1173 } |
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1174 void do_list(FreeList* fl) { |
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1175 if (++_print_line >= 40) { |
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1176 FreeList::print_labels_on(_st, "size"); |
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1177 _print_line = 0; |
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1178 } |
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1179 fl->print_on(gclog_or_tty); |
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1180 size_t sz = fl->size(); |
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1181 for (FreeChunk* fc = fl->head(); fc != NULL; |
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1182 fc = fc->next()) { |
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1183 _st->print_cr("\t[" PTR_FORMAT "," PTR_FORMAT ") %s", |
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1184 fc, (HeapWord*)fc + sz, |
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1185 fc->cantCoalesce() ? "\t CC" : ""); |
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1186 } |
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1187 } |
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1188 }; |
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1189 |
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1190 void BinaryTreeDictionary::print_free_lists(outputStream* st) const { |
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1191 |
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1192 FreeList::print_labels_on(st, "size"); |
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1193 PrintFreeListsClosure pflc(st); |
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1194 pflc.do_tree(root()); |
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1195 } |
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1196 |
0 | 1197 // Verify the following tree invariants: |
1198 // . _root has no parent | |
1199 // . parent and child point to each other | |
1200 // . each node's key correctly related to that of its child(ren) | |
1201 void BinaryTreeDictionary::verifyTree() const { | |
1202 guarantee(root() == NULL || totalFreeBlocks() == 0 || | |
1203 totalSize() != 0, "_totalSize should't be 0?"); | |
1204 guarantee(root() == NULL || root()->parent() == NULL, "_root shouldn't have parent"); | |
1205 verifyTreeHelper(root()); | |
1206 } | |
1207 | |
1208 size_t BinaryTreeDictionary::verifyPrevFreePtrs(TreeList* tl) { | |
1209 size_t ct = 0; | |
1210 for (FreeChunk* curFC = tl->head(); curFC != NULL; curFC = curFC->next()) { | |
1211 ct++; | |
1212 assert(curFC->prev() == NULL || curFC->prev()->isFree(), | |
1213 "Chunk should be free"); | |
1214 } | |
1215 return ct; | |
1216 } | |
1217 | |
1218 // Note: this helper is recursive rather than iterative, so use with | |
1219 // caution on very deep trees; and watch out for stack overflow errors; | |
1220 // In general, to be used only for debugging. | |
1221 void BinaryTreeDictionary::verifyTreeHelper(TreeList* tl) const { | |
1222 if (tl == NULL) | |
1223 return; | |
1224 guarantee(tl->size() != 0, "A list must has a size"); | |
1225 guarantee(tl->left() == NULL || tl->left()->parent() == tl, | |
1226 "parent<-/->left"); | |
1227 guarantee(tl->right() == NULL || tl->right()->parent() == tl, | |
1228 "parent<-/->right");; | |
1229 guarantee(tl->left() == NULL || tl->left()->size() < tl->size(), | |
1230 "parent !> left"); | |
1231 guarantee(tl->right() == NULL || tl->right()->size() > tl->size(), | |
1232 "parent !< left"); | |
1233 guarantee(tl->head() == NULL || tl->head()->isFree(), "!Free"); | |
1234 guarantee(tl->head() == NULL || tl->head_as_TreeChunk()->list() == tl, | |
1235 "list inconsistency"); | |
1236 guarantee(tl->count() > 0 || (tl->head() == NULL && tl->tail() == NULL), | |
1237 "list count is inconsistent"); | |
1238 guarantee(tl->count() > 1 || tl->head() == tl->tail(), | |
1239 "list is incorrectly constructed"); | |
1240 size_t count = verifyPrevFreePtrs(tl); | |
1241 guarantee(count == (size_t)tl->count(), "Node count is incorrect"); | |
1242 if (tl->head() != NULL) { | |
1243 tl->head_as_TreeChunk()->verifyTreeChunkList(); | |
1244 } | |
1245 verifyTreeHelper(tl->left()); | |
1246 verifyTreeHelper(tl->right()); | |
1247 } | |
1248 | |
1249 void BinaryTreeDictionary::verify() const { | |
1250 verifyTree(); | |
1251 guarantee(totalSize() == totalSizeInTree(root()), "Total Size inconsistency"); | |
1252 } |