Mercurial > hg > truffle
annotate src/share/vm/memory/freeList.cpp @ 6842:b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp
| author | mikael |
|---|---|
| date | Tue, 09 Oct 2012 10:09:34 -0700 |
| parents | f69a5d43dc19 |
| children | 685df3c6f84b |
| rev | line source |
|---|---|
| 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" | |
| 1972 | 28 #include "memory/sharedHeap.hpp" |
| 29 #include "runtime/globals.hpp" | |
| 30 #include "runtime/mutex.hpp" | |
| 31 #include "runtime/vmThread.hpp" | |
| 0 | 32 |
| 6026 | 33 #ifndef SERIALGC |
| 34 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" | |
| 35 #endif // SERIALGC | |
| 36 | |
| 0 | 37 // Free list. A FreeList is used to access a linked list of chunks |
| 38 // of space in the heap. The head and tail are maintained so that | |
| 39 // items can be (as in the current implementation) added at the | |
| 40 // at the tail of the list and removed from the head of the list to | |
| 41 // maintain a FIFO queue. | |
| 42 | |
| 6026 | 43 template <class Chunk> |
| 44 FreeList<Chunk>::FreeList() : | |
| 0 | 45 _head(NULL), _tail(NULL) |
| 46 #ifdef ASSERT | |
| 47 , _protecting_lock(NULL) | |
| 48 #endif | |
| 49 { | |
| 50 _size = 0; | |
| 51 _count = 0; | |
| 52 _hint = 0; | |
| 53 init_statistics(); | |
| 54 } | |
| 55 | |
| 6026 | 56 template <class Chunk> |
| 57 FreeList<Chunk>::FreeList(Chunk* fc) : | |
| 0 | 58 _head(fc), _tail(fc) |
| 59 #ifdef ASSERT | |
| 60 , _protecting_lock(NULL) | |
| 61 #endif | |
| 62 { | |
| 63 _size = fc->size(); | |
| 64 _count = 1; | |
| 65 _hint = 0; | |
| 66 init_statistics(); | |
| 67 #ifndef PRODUCT | |
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68 _allocation_stats.set_returned_bytes(size() * HeapWordSize); |
| 0 | 69 #endif |
| 70 } | |
| 71 | |
| 6026 | 72 template <class Chunk> |
| 73 void FreeList<Chunk>::reset(size_t hint) { | |
| 0 | 74 set_count(0); |
| 75 set_head(NULL); | |
| 76 set_tail(NULL); | |
| 77 set_hint(hint); | |
| 78 } | |
| 79 | |
| 6026 | 80 template <class Chunk> |
| 81 void FreeList<Chunk>::init_statistics(bool split_birth) { | |
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82 _allocation_stats.initialize(split_birth); |
| 0 | 83 } |
| 84 | |
| 6026 | 85 template <class Chunk> |
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86 Chunk* FreeList<Chunk>::get_chunk_at_head() { |
| 0 | 87 assert_proper_lock_protection(); |
| 88 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 89 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 6026 | 90 Chunk* fc = head(); |
| 0 | 91 if (fc != NULL) { |
| 6026 | 92 Chunk* nextFC = fc->next(); |
| 0 | 93 if (nextFC != NULL) { |
| 94 // The chunk fc being removed has a "next". Set the "next" to the | |
| 95 // "prev" of fc. | |
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96 nextFC->link_prev(NULL); |
| 0 | 97 } else { // removed tail of list |
| 98 link_tail(NULL); | |
| 99 } | |
| 100 link_head(nextFC); | |
| 101 decrement_count(); | |
| 102 } | |
| 103 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 104 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 105 return fc; | |
| 106 } | |
| 107 | |
| 108 | |
| 6026 | 109 template <class Chunk> |
| 110 void FreeList<Chunk>::getFirstNChunksFromList(size_t n, FreeList<Chunk>* fl) { | |
| 0 | 111 assert_proper_lock_protection(); |
| 112 assert(fl->count() == 0, "Precondition"); | |
| 113 if (count() > 0) { | |
| 114 int k = 1; | |
| 115 fl->set_head(head()); n--; | |
| 6026 | 116 Chunk* tl = head(); |
| 0 | 117 while (tl->next() != NULL && n > 0) { |
| 118 tl = tl->next(); n--; k++; | |
| 119 } | |
| 120 assert(tl != NULL, "Loop Inv."); | |
| 121 | |
| 122 // First, fix up the list we took from. | |
| 6026 | 123 Chunk* new_head = tl->next(); |
| 0 | 124 set_head(new_head); |
| 125 set_count(count() - k); | |
| 126 if (new_head == NULL) { | |
| 127 set_tail(NULL); | |
| 128 } else { | |
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129 new_head->link_prev(NULL); |
| 0 | 130 } |
| 131 // Now we can fix up the tail. | |
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132 tl->link_next(NULL); |
| 0 | 133 // And return the result. |
| 134 fl->set_tail(tl); | |
| 135 fl->set_count(k); | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 // Remove this chunk from the list | |
| 6026 | 140 template <class Chunk> |
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141 void FreeList<Chunk>::remove_chunk(Chunk*fc) { |
| 0 | 142 assert_proper_lock_protection(); |
| 143 assert(head() != NULL, "Remove from empty list"); | |
| 144 assert(fc != NULL, "Remove a NULL chunk"); | |
| 145 assert(size() == fc->size(), "Wrong list"); | |
| 146 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 147 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 148 | |
| 6026 | 149 Chunk* prevFC = fc->prev(); |
| 150 Chunk* nextFC = fc->next(); | |
| 0 | 151 if (nextFC != NULL) { |
| 152 // The chunk fc being removed has a "next". Set the "next" to the | |
| 153 // "prev" of fc. | |
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154 nextFC->link_prev(prevFC); |
| 0 | 155 } else { // removed tail of list |
| 156 link_tail(prevFC); | |
| 157 } | |
| 158 if (prevFC == NULL) { // removed head of list | |
| 159 link_head(nextFC); | |
| 160 assert(nextFC == NULL || nextFC->prev() == NULL, | |
| 161 "Prev of head should be NULL"); | |
| 162 } else { | |
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163 prevFC->link_next(nextFC); |
| 0 | 164 assert(tail() != prevFC || prevFC->next() == NULL, |
| 165 "Next of tail should be NULL"); | |
| 166 } | |
| 167 decrement_count(); | |
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168 assert(((head() == NULL) + (tail() == NULL) + (count() == 0)) % 3 == 0, |
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169 "H/T/C Inconsistency"); |
| 0 | 170 // clear next and prev fields of fc, debug only |
| 171 NOT_PRODUCT( | |
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172 fc->link_prev(NULL); |
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173 fc->link_next(NULL); |
| 0 | 174 ) |
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175 assert(fc->is_free(), "Should still be a free chunk"); |
| 0 | 176 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
| 177 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 178 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
| 179 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
| 180 } | |
| 181 | |
| 182 // Add this chunk at the head of the list. | |
| 6026 | 183 template <class Chunk> |
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184 void FreeList<Chunk>::return_chunk_at_head(Chunk* chunk, bool record_return) { |
| 0 | 185 assert_proper_lock_protection(); |
| 186 assert(chunk != NULL, "insert a NULL chunk"); | |
| 187 assert(size() == chunk->size(), "Wrong size"); | |
| 188 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 189 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 190 | |
| 6026 | 191 Chunk* oldHead = head(); |
| 0 | 192 assert(chunk != oldHead, "double insertion"); |
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193 chunk->link_after(oldHead); |
| 0 | 194 link_head(chunk); |
| 195 if (oldHead == NULL) { // only chunk in list | |
| 196 assert(tail() == NULL, "inconsistent FreeList"); | |
| 197 link_tail(chunk); | |
| 198 } | |
| 199 increment_count(); // of # of chunks in list | |
| 200 DEBUG_ONLY( | |
| 201 if (record_return) { | |
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202 increment_returned_bytes_by(size()*HeapWordSize); |
| 0 | 203 } |
| 204 ) | |
| 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 DEBUG_ONLY( | |
| 237 if (record_return) { | |
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238 increment_returned_bytes_by(size()*HeapWordSize); |
| 0 | 239 } |
| 240 ) | |
| 241 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
| 242 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
| 243 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
| 244 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
| 245 } | |
| 246 | |
| 6026 | 247 template <class Chunk> |
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248 void FreeList<Chunk>::return_chunk_at_tail(Chunk* chunk) { |
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249 return_chunk_at_tail(chunk, true); |
| 0 | 250 } |
| 251 | |
| 6026 | 252 template <class Chunk> |
| 253 void FreeList<Chunk>::prepend(FreeList<Chunk>* fl) { | |
| 0 | 254 assert_proper_lock_protection(); |
| 255 if (fl->count() > 0) { | |
| 256 if (count() == 0) { | |
| 257 set_head(fl->head()); | |
| 258 set_tail(fl->tail()); | |
| 259 set_count(fl->count()); | |
| 260 } else { | |
| 261 // Both are non-empty. | |
| 6026 | 262 Chunk* fl_tail = fl->tail(); |
| 263 Chunk* this_head = head(); | |
| 0 | 264 assert(fl_tail->next() == NULL, "Well-formedness of fl"); |
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265 fl_tail->link_next(this_head); |
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266 this_head->link_prev(fl_tail); |
| 0 | 267 set_head(fl->head()); |
| 268 set_count(count() + fl->count()); | |
| 269 } | |
| 270 fl->set_head(NULL); | |
| 271 fl->set_tail(NULL); | |
| 272 fl->set_count(0); | |
| 273 } | |
| 274 } | |
| 275 | |
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276 // verify_chunk_in_free_list() is used to verify that an item is in this free list. |
| 0 | 277 // It is used as a debugging aid. |
| 6026 | 278 template <class Chunk> |
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279 bool FreeList<Chunk>::verify_chunk_in_free_list(Chunk* fc) const { |
| 0 | 280 // This is an internal consistency check, not part of the check that the |
| 281 // chunk is in the free lists. | |
| 282 guarantee(fc->size() == size(), "Wrong list is being searched"); | |
| 6026 | 283 Chunk* curFC = head(); |
| 0 | 284 while (curFC) { |
| 285 // This is an internal consistency check. | |
| 286 guarantee(size() == curFC->size(), "Chunk is in wrong list."); | |
| 287 if (fc == curFC) { | |
| 288 return true; | |
| 289 } | |
| 290 curFC = curFC->next(); | |
| 291 } | |
| 292 return false; | |
| 293 } | |
| 294 | |
| 295 #ifndef PRODUCT | |
| 6026 | 296 template <class Chunk> |
| 297 void FreeList<Chunk>::verify_stats() const { | |
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298 // The +1 of the LH comparand is to allow some "looseness" in |
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299 // checking: we usually call this interface when adding a block |
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300 // and we'll subsequently update the stats; we cannot update the |
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301 // stats beforehand because in the case of the large-block BT |
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302 // dictionary for example, this might be the first block and |
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303 // in that case there would be no place that we could record |
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304 // the stats (which are kept in the block itself). |
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305 assert((_allocation_stats.prev_sweep() + _allocation_stats.split_births() |
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306 + _allocation_stats.coal_births() + 1) // Total Production Stock + 1 |
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307 >= (_allocation_stats.split_deaths() + _allocation_stats.coal_deaths() |
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308 + (ssize_t)count()), // Total Current Stock + depletion |
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309 err_msg("FreeList " PTR_FORMAT " of size " SIZE_FORMAT |
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310 " violates Conservation Principle: " |
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311 "prev_sweep(" SIZE_FORMAT ")" |
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312 " + split_births(" SIZE_FORMAT ")" |
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313 " + coal_births(" SIZE_FORMAT ") + 1 >= " |
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314 " split_deaths(" SIZE_FORMAT ")" |
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315 " coal_deaths(" SIZE_FORMAT ")" |
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316 " + count(" SSIZE_FORMAT ")", |
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317 this, _size, _allocation_stats.prev_sweep(), _allocation_stats.split_births(), |
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318 _allocation_stats.split_births(), _allocation_stats.split_deaths(), |
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319 _allocation_stats.coal_deaths(), count())); |
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320 } |
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321 |
| 6026 | 322 template <class Chunk> |
| 323 void FreeList<Chunk>::assert_proper_lock_protection_work() const { | |
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324 assert(_protecting_lock != NULL, "Don't call this directly"); |
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325 assert(ParallelGCThreads > 0, "Don't call this directly"); |
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326 Thread* thr = Thread::current(); |
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327 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
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328 // assert that we are holding the freelist lock |
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329 } else if (thr->is_GC_task_thread()) { |
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330 assert(_protecting_lock->owned_by_self(), "FreeList RACE DETECTED"); |
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331 } else if (thr->is_Java_thread()) { |
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332 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); |
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333 } else { |
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334 ShouldNotReachHere(); // unaccounted thread type? |
| 0 | 335 } |
| 336 } | |
| 337 #endif | |
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338 |
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339 // Print the "label line" for free list stats. |
| 6026 | 340 template <class Chunk> |
| 341 void FreeList<Chunk>::print_labels_on(outputStream* st, const char* c) { | |
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342 st->print("%16s\t", c); |
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343 st->print("%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" |
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344 "%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" "\n", |
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345 "bfrsurp", "surplus", "desired", "prvSwep", "bfrSwep", |
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346 "count", "cBirths", "cDeaths", "sBirths", "sDeaths"); |
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347 } |
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348 |
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349 // Print the AllocationStats for the given free list. If the second argument |
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350 // to the call is a non-null string, it is printed in the first column; |
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351 // otherwise, if the argument is null (the default), then the size of the |
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352 // (free list) block is printed in the first column. |
| 6026 | 353 template <class Chunk> |
| 354 void FreeList<Chunk>::print_on(outputStream* st, const char* c) const { | |
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355 if (c != NULL) { |
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356 st->print("%16s", c); |
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357 } else { |
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358 st->print(SIZE_FORMAT_W(16), size()); |
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359 } |
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360 st->print("\t" |
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361 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" |
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362 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\n", |
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363 bfr_surp(), surplus(), desired(), prev_sweep(), before_sweep(), |
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364 count(), coal_births(), coal_deaths(), split_births(), split_deaths()); |
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365 } |
| 6026 | 366 |
| 367 #ifndef SERIALGC | |
| 368 // Needs to be after the definitions have been seen. | |
| 369 template class FreeList<FreeChunk>; | |
| 370 #endif // SERIALGC |