Mercurial > hg > truffle
annotate src/share/vm/memory/freeList.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2001, 2013, 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/metachunk.hpp" |
| 1972 | 29 #include "memory/sharedHeap.hpp" |
| 30 #include "runtime/globals.hpp" | |
| 31 #include "runtime/mutex.hpp" | |
| 32 #include "runtime/vmThread.hpp" | |
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33 #include "utilities/macros.hpp" |
| 0 | 34 |
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35 #if INCLUDE_ALL_GCS |
| 6026 | 36 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
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37 #endif // INCLUDE_ALL_GCS |
| 6026 | 38 |
| 0 | 39 // Free list. A FreeList is used to access a linked list of chunks |
| 40 // of space in the heap. The head and tail are maintained so that | |
| 41 // items can be (as in the current implementation) added at the | |
| 42 // at the tail of the list and removed from the head of the list to | |
| 43 // maintain a FIFO queue. | |
| 44 | |
| 6026 | 45 template <class Chunk> |
| 46 FreeList<Chunk>::FreeList() : | |
| 0 | 47 _head(NULL), _tail(NULL) |
| 48 #ifdef ASSERT | |
| 49 , _protecting_lock(NULL) | |
| 50 #endif | |
| 51 { | |
| 52 _size = 0; | |
| 53 _count = 0; | |
| 54 } | |
| 55 | |
| 6026 | 56 template <class Chunk> |
| 6885 | 57 void FreeList<Chunk>::link_head(Chunk* v) { |
| 58 assert_proper_lock_protection(); | |
| 59 set_head(v); | |
| 60 // If this method is not used (just set the head instead), | |
| 61 // this check can be avoided. | |
| 62 if (v != NULL) { | |
| 63 v->link_prev(NULL); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 | |
| 68 | |
| 69 template <class Chunk> | |
| 70 void FreeList<Chunk>::reset() { | |
| 71 // Don't set the _size to 0 because this method is | |
| 72 // used with a existing list that has a size but which has | |
| 73 // been emptied. | |
| 74 // Don't clear the _protecting_lock of an existing list. | |
| 0 | 75 set_count(0); |
| 76 set_head(NULL); | |
| 77 set_tail(NULL); | |
| 78 } | |
| 79 | |
| 6026 | 80 template <class Chunk> |
| 6885 | 81 void FreeList<Chunk>::initialize() { |
| 82 #ifdef ASSERT | |
| 83 // Needed early because it might be checked in other initializing code. | |
| 84 set_protecting_lock(NULL); | |
| 85 #endif | |
| 86 reset(); | |
| 87 set_size(0); | |
| 0 | 88 } |
| 89 | |
| 6885 | 90 template <class Chunk_t> |
| 91 Chunk_t* FreeList<Chunk_t>::get_chunk_at_head() { | |
| 0 | 92 assert_proper_lock_protection(); |
| 93 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 94 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 6885 | 95 Chunk_t* fc = head(); |
| 0 | 96 if (fc != NULL) { |
| 6885 | 97 Chunk_t* nextFC = fc->next(); |
| 0 | 98 if (nextFC != NULL) { |
| 99 // The chunk fc being removed has a "next". Set the "next" to the | |
| 100 // "prev" of fc. | |
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101 nextFC->link_prev(NULL); |
| 0 | 102 } else { // removed tail of list |
| 103 link_tail(NULL); | |
| 104 } | |
| 105 link_head(nextFC); | |
| 106 decrement_count(); | |
| 107 } | |
| 108 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 109 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 110 return fc; | |
| 111 } | |
| 112 | |
| 113 | |
| 6026 | 114 template <class Chunk> |
| 115 void FreeList<Chunk>::getFirstNChunksFromList(size_t n, FreeList<Chunk>* fl) { | |
| 0 | 116 assert_proper_lock_protection(); |
| 117 assert(fl->count() == 0, "Precondition"); | |
| 118 if (count() > 0) { | |
| 119 int k = 1; | |
| 120 fl->set_head(head()); n--; | |
| 6026 | 121 Chunk* tl = head(); |
| 0 | 122 while (tl->next() != NULL && n > 0) { |
| 123 tl = tl->next(); n--; k++; | |
| 124 } | |
| 125 assert(tl != NULL, "Loop Inv."); | |
| 126 | |
| 127 // First, fix up the list we took from. | |
| 6026 | 128 Chunk* new_head = tl->next(); |
| 0 | 129 set_head(new_head); |
| 130 set_count(count() - k); | |
| 131 if (new_head == NULL) { | |
| 132 set_tail(NULL); | |
| 133 } else { | |
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134 new_head->link_prev(NULL); |
| 0 | 135 } |
| 136 // Now we can fix up the tail. | |
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137 tl->link_next(NULL); |
| 0 | 138 // And return the result. |
| 139 fl->set_tail(tl); | |
| 140 fl->set_count(k); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // Remove this chunk from the list | |
| 6026 | 145 template <class Chunk> |
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146 void FreeList<Chunk>::remove_chunk(Chunk*fc) { |
| 0 | 147 assert_proper_lock_protection(); |
| 148 assert(head() != NULL, "Remove from empty list"); | |
| 149 assert(fc != NULL, "Remove a NULL chunk"); | |
| 150 assert(size() == fc->size(), "Wrong list"); | |
| 151 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 152 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 153 | |
| 6026 | 154 Chunk* prevFC = fc->prev(); |
| 155 Chunk* nextFC = fc->next(); | |
| 0 | 156 if (nextFC != NULL) { |
| 157 // The chunk fc being removed has a "next". Set the "next" to the | |
| 158 // "prev" of fc. | |
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159 nextFC->link_prev(prevFC); |
| 0 | 160 } else { // removed tail of list |
| 161 link_tail(prevFC); | |
| 162 } | |
| 163 if (prevFC == NULL) { // removed head of list | |
| 164 link_head(nextFC); | |
| 165 assert(nextFC == NULL || nextFC->prev() == NULL, | |
| 166 "Prev of head should be NULL"); | |
| 167 } else { | |
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168 prevFC->link_next(nextFC); |
| 0 | 169 assert(tail() != prevFC || prevFC->next() == NULL, |
| 170 "Next of tail should be NULL"); | |
| 171 } | |
| 172 decrement_count(); | |
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173 assert(((head() == NULL) + (tail() == NULL) + (count() == 0)) % 3 == 0, |
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174 "H/T/C Inconsistency"); |
| 0 | 175 // clear next and prev fields of fc, debug only |
| 176 NOT_PRODUCT( | |
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177 fc->link_prev(NULL); |
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178 fc->link_next(NULL); |
| 0 | 179 ) |
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180 assert(fc->is_free(), "Should still be a free chunk"); |
| 0 | 181 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
| 182 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 183 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
| 184 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
| 185 } | |
| 186 | |
| 187 // Add this chunk at the head of the list. | |
| 6026 | 188 template <class Chunk> |
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189 void FreeList<Chunk>::return_chunk_at_head(Chunk* chunk, bool record_return) { |
| 0 | 190 assert_proper_lock_protection(); |
| 191 assert(chunk != NULL, "insert a NULL chunk"); | |
| 192 assert(size() == chunk->size(), "Wrong size"); | |
| 193 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 194 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 195 | |
| 6026 | 196 Chunk* oldHead = head(); |
| 0 | 197 assert(chunk != oldHead, "double insertion"); |
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198 chunk->link_after(oldHead); |
| 0 | 199 link_head(chunk); |
| 200 if (oldHead == NULL) { // only chunk in list | |
| 201 assert(tail() == NULL, "inconsistent FreeList"); | |
| 202 link_tail(chunk); | |
| 203 } | |
| 204 increment_count(); // of # of chunks in list | |
| 205 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 206 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 207 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
| 208 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
| 209 } | |
| 210 | |
| 6026 | 211 template <class Chunk> |
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212 void FreeList<Chunk>::return_chunk_at_head(Chunk* chunk) { |
| 0 | 213 assert_proper_lock_protection(); |
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214 return_chunk_at_head(chunk, true); |
| 0 | 215 } |
| 216 | |
| 217 // Add this chunk at the tail of the list. | |
| 6026 | 218 template <class Chunk> |
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219 void FreeList<Chunk>::return_chunk_at_tail(Chunk* chunk, bool record_return) { |
| 0 | 220 assert_proper_lock_protection(); |
| 221 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 222 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 223 assert(chunk != NULL, "insert a NULL chunk"); | |
| 224 assert(size() == chunk->size(), "wrong size"); | |
| 225 | |
| 6026 | 226 Chunk* oldTail = tail(); |
| 0 | 227 assert(chunk != oldTail, "double insertion"); |
| 228 if (oldTail != NULL) { | |
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229 oldTail->link_after(chunk); |
| 0 | 230 } else { // only chunk in list |
| 231 assert(head() == NULL, "inconsistent FreeList"); | |
| 232 link_head(chunk); | |
| 233 } | |
| 234 link_tail(chunk); | |
| 235 increment_count(); // of # of chunks in list | |
| 236 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 237 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 238 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
| 239 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
| 240 } | |
| 241 | |
| 6026 | 242 template <class Chunk> |
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243 void FreeList<Chunk>::return_chunk_at_tail(Chunk* chunk) { |
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244 return_chunk_at_tail(chunk, true); |
| 0 | 245 } |
| 246 | |
| 6026 | 247 template <class Chunk> |
| 248 void FreeList<Chunk>::prepend(FreeList<Chunk>* fl) { | |
| 0 | 249 assert_proper_lock_protection(); |
| 250 if (fl->count() > 0) { | |
| 251 if (count() == 0) { | |
| 252 set_head(fl->head()); | |
| 253 set_tail(fl->tail()); | |
| 254 set_count(fl->count()); | |
| 255 } else { | |
| 256 // Both are non-empty. | |
| 6026 | 257 Chunk* fl_tail = fl->tail(); |
| 258 Chunk* this_head = head(); | |
| 0 | 259 assert(fl_tail->next() == NULL, "Well-formedness of fl"); |
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260 fl_tail->link_next(this_head); |
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261 this_head->link_prev(fl_tail); |
| 0 | 262 set_head(fl->head()); |
| 263 set_count(count() + fl->count()); | |
| 264 } | |
| 265 fl->set_head(NULL); | |
| 266 fl->set_tail(NULL); | |
| 267 fl->set_count(0); | |
| 268 } | |
| 269 } | |
| 270 | |
| 6885 | 271 // verify_chunk_in_free_lists() is used to verify that an item is in this free list. |
| 0 | 272 // It is used as a debugging aid. |
| 6026 | 273 template <class Chunk> |
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274 bool FreeList<Chunk>::verify_chunk_in_free_list(Chunk* fc) const { |
| 0 | 275 // This is an internal consistency check, not part of the check that the |
| 276 // chunk is in the free lists. | |
| 277 guarantee(fc->size() == size(), "Wrong list is being searched"); | |
| 6026 | 278 Chunk* curFC = head(); |
| 0 | 279 while (curFC) { |
| 280 // This is an internal consistency check. | |
| 281 guarantee(size() == curFC->size(), "Chunk is in wrong list."); | |
| 282 if (fc == curFC) { | |
| 283 return true; | |
| 284 } | |
| 285 curFC = curFC->next(); | |
| 286 } | |
| 287 return false; | |
| 288 } | |
| 289 | |
| 290 #ifndef PRODUCT | |
| 6026 | 291 template <class Chunk> |
| 292 void FreeList<Chunk>::assert_proper_lock_protection_work() const { | |
| 6885 | 293 assert(protecting_lock() != NULL, "Don't call this directly"); |
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294 assert(ParallelGCThreads > 0, "Don't call this directly"); |
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295 Thread* thr = Thread::current(); |
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296 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
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297 // assert that we are holding the freelist lock |
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298 } else if (thr->is_GC_task_thread()) { |
| 6885 | 299 assert(protecting_lock()->owned_by_self(), "FreeList RACE DETECTED"); |
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300 } else if (thr->is_Java_thread()) { |
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301 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); |
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302 } else { |
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303 ShouldNotReachHere(); // unaccounted thread type? |
| 0 | 304 } |
| 305 } | |
| 306 #endif | |
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307 |
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308 // Print the "label line" for free list stats. |
| 6026 | 309 template <class Chunk> |
| 310 void FreeList<Chunk>::print_labels_on(outputStream* st, const char* c) { | |
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311 st->print("%16s\t", c); |
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312 st->print("%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" |
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313 "%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" "\n", |
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314 "bfrsurp", "surplus", "desired", "prvSwep", "bfrSwep", |
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315 "count", "cBirths", "cDeaths", "sBirths", "sDeaths"); |
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316 } |
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317 |
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318 // Print the AllocationStats for the given free list. If the second argument |
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319 // to the call is a non-null string, it is printed in the first column; |
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320 // otherwise, if the argument is null (the default), then the size of the |
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321 // (free list) block is printed in the first column. |
| 6885 | 322 template <class Chunk_t> |
| 323 void FreeList<Chunk_t>::print_on(outputStream* st, const char* c) const { | |
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324 if (c != NULL) { |
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325 st->print("%16s", c); |
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326 } else { |
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327 st->print(SIZE_FORMAT_W(16), size()); |
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328 } |
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329 } |
| 6026 | 330 |
| 6885 | 331 template class FreeList<Metablock>; |
| 332 template class FreeList<Metachunk>; | |
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8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
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333 #if INCLUDE_ALL_GCS |
| 6026 | 334 template class FreeList<FreeChunk>; |
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8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6885
diff
changeset
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335 #endif // INCLUDE_ALL_GCS |