Mercurial > hg > truffle
annotate src/share/vm/memory/freeList.cpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | 7c5a1b62f53d |
children | bdfbb1fb19ca |
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0 | 1 /* |
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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" |
6026 | 26 #include "memory/freeBlockDictionary.hpp" |
27 #include "memory/freeList.hpp" | |
6885 | 28 #include "memory/metablock.hpp" |
29 #include "memory/metachunk.hpp" | |
1972 | 30 #include "memory/sharedHeap.hpp" |
31 #include "runtime/globals.hpp" | |
32 #include "runtime/mutex.hpp" | |
33 #include "runtime/vmThread.hpp" | |
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34 #include "utilities/macros.hpp" |
0 | 35 |
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36 #if INCLUDE_ALL_GCS |
6026 | 37 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
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38 #endif // INCLUDE_ALL_GCS |
6026 | 39 |
0 | 40 // Free list. A FreeList is used to access a linked list of chunks |
41 // of space in the heap. The head and tail are maintained so that | |
42 // items can be (as in the current implementation) added at the | |
43 // at the tail of the list and removed from the head of the list to | |
44 // maintain a FIFO queue. | |
45 | |
6026 | 46 template <class Chunk> |
47 FreeList<Chunk>::FreeList() : | |
0 | 48 _head(NULL), _tail(NULL) |
49 #ifdef ASSERT | |
50 , _protecting_lock(NULL) | |
51 #endif | |
52 { | |
53 _size = 0; | |
54 _count = 0; | |
55 } | |
56 | |
6026 | 57 template <class Chunk> |
6885 | 58 void FreeList<Chunk>::link_head(Chunk* v) { |
59 assert_proper_lock_protection(); | |
60 set_head(v); | |
61 // If this method is not used (just set the head instead), | |
62 // this check can be avoided. | |
63 if (v != NULL) { | |
64 v->link_prev(NULL); | |
65 } | |
66 } | |
67 | |
68 | |
69 | |
70 template <class Chunk> | |
71 void FreeList<Chunk>::reset() { | |
72 // Don't set the _size to 0 because this method is | |
73 // used with a existing list that has a size but which has | |
74 // been emptied. | |
75 // Don't clear the _protecting_lock of an existing list. | |
0 | 76 set_count(0); |
77 set_head(NULL); | |
78 set_tail(NULL); | |
79 } | |
80 | |
6026 | 81 template <class Chunk> |
6885 | 82 void FreeList<Chunk>::initialize() { |
83 #ifdef ASSERT | |
84 // Needed early because it might be checked in other initializing code. | |
85 set_protecting_lock(NULL); | |
86 #endif | |
87 reset(); | |
88 set_size(0); | |
0 | 89 } |
90 | |
6885 | 91 template <class Chunk_t> |
92 Chunk_t* FreeList<Chunk_t>::get_chunk_at_head() { | |
0 | 93 assert_proper_lock_protection(); |
94 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
95 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
6885 | 96 Chunk_t* fc = head(); |
0 | 97 if (fc != NULL) { |
6885 | 98 Chunk_t* nextFC = fc->next(); |
0 | 99 if (nextFC != NULL) { |
100 // The chunk fc being removed has a "next". Set the "next" to the | |
101 // "prev" of fc. | |
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102 nextFC->link_prev(NULL); |
0 | 103 } else { // removed tail of list |
104 link_tail(NULL); | |
105 } | |
106 link_head(nextFC); | |
107 decrement_count(); | |
108 } | |
109 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
110 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
111 return fc; | |
112 } | |
113 | |
114 | |
6026 | 115 template <class Chunk> |
116 void FreeList<Chunk>::getFirstNChunksFromList(size_t n, FreeList<Chunk>* fl) { | |
0 | 117 assert_proper_lock_protection(); |
118 assert(fl->count() == 0, "Precondition"); | |
119 if (count() > 0) { | |
120 int k = 1; | |
121 fl->set_head(head()); n--; | |
6026 | 122 Chunk* tl = head(); |
0 | 123 while (tl->next() != NULL && n > 0) { |
124 tl = tl->next(); n--; k++; | |
125 } | |
126 assert(tl != NULL, "Loop Inv."); | |
127 | |
128 // First, fix up the list we took from. | |
6026 | 129 Chunk* new_head = tl->next(); |
0 | 130 set_head(new_head); |
131 set_count(count() - k); | |
132 if (new_head == NULL) { | |
133 set_tail(NULL); | |
134 } else { | |
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135 new_head->link_prev(NULL); |
0 | 136 } |
137 // Now we can fix up the tail. | |
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138 tl->link_next(NULL); |
0 | 139 // And return the result. |
140 fl->set_tail(tl); | |
141 fl->set_count(k); | |
142 } | |
143 } | |
144 | |
145 // Remove this chunk from the list | |
6026 | 146 template <class Chunk> |
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147 void FreeList<Chunk>::remove_chunk(Chunk*fc) { |
0 | 148 assert_proper_lock_protection(); |
149 assert(head() != NULL, "Remove from empty list"); | |
150 assert(fc != NULL, "Remove a NULL chunk"); | |
151 assert(size() == fc->size(), "Wrong list"); | |
152 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
153 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
154 | |
6026 | 155 Chunk* prevFC = fc->prev(); |
156 Chunk* nextFC = fc->next(); | |
0 | 157 if (nextFC != NULL) { |
158 // The chunk fc being removed has a "next". Set the "next" to the | |
159 // "prev" of fc. | |
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160 nextFC->link_prev(prevFC); |
0 | 161 } else { // removed tail of list |
162 link_tail(prevFC); | |
163 } | |
164 if (prevFC == NULL) { // removed head of list | |
165 link_head(nextFC); | |
166 assert(nextFC == NULL || nextFC->prev() == NULL, | |
167 "Prev of head should be NULL"); | |
168 } else { | |
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169 prevFC->link_next(nextFC); |
0 | 170 assert(tail() != prevFC || prevFC->next() == NULL, |
171 "Next of tail should be NULL"); | |
172 } | |
173 decrement_count(); | |
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174 assert(((head() == NULL) + (tail() == NULL) + (count() == 0)) % 3 == 0, |
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175 "H/T/C Inconsistency"); |
0 | 176 // clear next and prev fields of fc, debug only |
177 NOT_PRODUCT( | |
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178 fc->link_prev(NULL); |
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179 fc->link_next(NULL); |
0 | 180 ) |
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181 assert(fc->is_free(), "Should still be a free chunk"); |
0 | 182 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
183 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
184 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
185 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
186 } | |
187 | |
188 // Add this chunk at the head of the list. | |
6026 | 189 template <class Chunk> |
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190 void FreeList<Chunk>::return_chunk_at_head(Chunk* chunk, bool record_return) { |
0 | 191 assert_proper_lock_protection(); |
192 assert(chunk != NULL, "insert a NULL chunk"); | |
193 assert(size() == chunk->size(), "Wrong size"); | |
194 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
195 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
196 | |
6026 | 197 Chunk* oldHead = head(); |
0 | 198 assert(chunk != oldHead, "double insertion"); |
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199 chunk->link_after(oldHead); |
0 | 200 link_head(chunk); |
201 if (oldHead == NULL) { // only chunk in list | |
202 assert(tail() == NULL, "inconsistent FreeList"); | |
203 link_tail(chunk); | |
204 } | |
205 increment_count(); // of # of chunks in list | |
206 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
207 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
208 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
209 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
210 } | |
211 | |
6026 | 212 template <class Chunk> |
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213 void FreeList<Chunk>::return_chunk_at_head(Chunk* chunk) { |
0 | 214 assert_proper_lock_protection(); |
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215 return_chunk_at_head(chunk, true); |
0 | 216 } |
217 | |
218 // Add this chunk at the tail of the list. | |
6026 | 219 template <class Chunk> |
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220 void FreeList<Chunk>::return_chunk_at_tail(Chunk* chunk, bool record_return) { |
0 | 221 assert_proper_lock_protection(); |
222 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
223 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
224 assert(chunk != NULL, "insert a NULL chunk"); | |
225 assert(size() == chunk->size(), "wrong size"); | |
226 | |
6026 | 227 Chunk* oldTail = tail(); |
0 | 228 assert(chunk != oldTail, "double insertion"); |
229 if (oldTail != NULL) { | |
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230 oldTail->link_after(chunk); |
0 | 231 } else { // only chunk in list |
232 assert(head() == NULL, "inconsistent FreeList"); | |
233 link_head(chunk); | |
234 } | |
235 link_tail(chunk); | |
236 increment_count(); // of # of chunks in list | |
237 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
238 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
239 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
240 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
241 } | |
242 | |
6026 | 243 template <class Chunk> |
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244 void FreeList<Chunk>::return_chunk_at_tail(Chunk* chunk) { |
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245 return_chunk_at_tail(chunk, true); |
0 | 246 } |
247 | |
6026 | 248 template <class Chunk> |
249 void FreeList<Chunk>::prepend(FreeList<Chunk>* fl) { | |
0 | 250 assert_proper_lock_protection(); |
251 if (fl->count() > 0) { | |
252 if (count() == 0) { | |
253 set_head(fl->head()); | |
254 set_tail(fl->tail()); | |
255 set_count(fl->count()); | |
256 } else { | |
257 // Both are non-empty. | |
6026 | 258 Chunk* fl_tail = fl->tail(); |
259 Chunk* this_head = head(); | |
0 | 260 assert(fl_tail->next() == NULL, "Well-formedness of fl"); |
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261 fl_tail->link_next(this_head); |
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262 this_head->link_prev(fl_tail); |
0 | 263 set_head(fl->head()); |
264 set_count(count() + fl->count()); | |
265 } | |
266 fl->set_head(NULL); | |
267 fl->set_tail(NULL); | |
268 fl->set_count(0); | |
269 } | |
270 } | |
271 | |
6885 | 272 // verify_chunk_in_free_lists() is used to verify that an item is in this free list. |
0 | 273 // It is used as a debugging aid. |
6026 | 274 template <class Chunk> |
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275 bool FreeList<Chunk>::verify_chunk_in_free_list(Chunk* fc) const { |
0 | 276 // This is an internal consistency check, not part of the check that the |
277 // chunk is in the free lists. | |
278 guarantee(fc->size() == size(), "Wrong list is being searched"); | |
6026 | 279 Chunk* curFC = head(); |
0 | 280 while (curFC) { |
281 // This is an internal consistency check. | |
282 guarantee(size() == curFC->size(), "Chunk is in wrong list."); | |
283 if (fc == curFC) { | |
284 return true; | |
285 } | |
286 curFC = curFC->next(); | |
287 } | |
288 return false; | |
289 } | |
290 | |
291 #ifndef PRODUCT | |
6026 | 292 template <class Chunk> |
293 void FreeList<Chunk>::assert_proper_lock_protection_work() const { | |
6885 | 294 assert(protecting_lock() != NULL, "Don't call this directly"); |
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295 assert(ParallelGCThreads > 0, "Don't call this directly"); |
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296 Thread* thr = Thread::current(); |
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297 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
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298 // assert that we are holding the freelist lock |
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299 } else if (thr->is_GC_task_thread()) { |
6885 | 300 assert(protecting_lock()->owned_by_self(), "FreeList RACE DETECTED"); |
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301 } else if (thr->is_Java_thread()) { |
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302 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); |
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303 } else { |
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304 ShouldNotReachHere(); // unaccounted thread type? |
0 | 305 } |
306 } | |
307 #endif | |
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308 |
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309 // Print the "label line" for free list stats. |
6026 | 310 template <class Chunk> |
311 void FreeList<Chunk>::print_labels_on(outputStream* st, const char* c) { | |
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312 st->print("%16s\t", c); |
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313 st->print("%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" |
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314 "%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" "\n", |
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315 "bfrsurp", "surplus", "desired", "prvSwep", "bfrSwep", |
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316 "count", "cBirths", "cDeaths", "sBirths", "sDeaths"); |
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317 } |
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318 |
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319 // Print the AllocationStats for the given free list. If the second argument |
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320 // to the call is a non-null string, it is printed in the first column; |
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321 // otherwise, if the argument is null (the default), then the size of the |
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322 // (free list) block is printed in the first column. |
6885 | 323 template <class Chunk_t> |
324 void FreeList<Chunk_t>::print_on(outputStream* st, const char* c) const { | |
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325 if (c != NULL) { |
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326 st->print("%16s", c); |
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327 } else { |
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328 st->print(SIZE_FORMAT_W(16), size()); |
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329 } |
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330 } |
6026 | 331 |
6885 | 332 template class FreeList<Metablock>; |
333 template class FreeList<Metachunk>; | |
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334 #if INCLUDE_ALL_GCS |
6026 | 335 template class FreeList<FreeChunk>; |
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336 #endif // INCLUDE_ALL_GCS |