Mercurial > hg > truffle
annotate src/share/vm/memory/freeList.hpp @ 6028:f69a5d43dc19
7164144: Fix variable naming style in freeBlockDictionary.* and binaryTreeDictionary*
Summary: Fix naming style to be consistent with the predominant hotspot style.
Reviewed-by: ysr, brutisso
| author | jmasa |
|---|---|
| date | Wed, 25 Apr 2012 09:55:55 -0700 |
| parents | 9f059abe8cf2 |
| children | b9a9ed0f8eeb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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 | |
| 6026 | 25 #ifndef SHARE_VM_MEMORY_FREELIST_HPP |
| 26 #define SHARE_VM_MEMORY_FREELIST_HPP | |
| 1972 | 27 |
| 28 #include "gc_implementation/shared/allocationStats.hpp" | |
| 29 | |
| 0 | 30 class CompactibleFreeListSpace; |
| 31 | |
| 6026 | 32 // A class for maintaining a free list of Chunk's. The FreeList |
| 0 | 33 // maintains a the structure of the list (head, tail, etc.) plus |
| 34 // statistics for allocations from the list. The links between items | |
| 35 // are not part of FreeList. The statistics are | |
| 6026 | 36 // used to make decisions about coalescing Chunk's when they |
| 0 | 37 // are swept during collection. |
| 38 // | |
| 39 // See the corresponding .cpp file for a description of the specifics | |
| 40 // for that implementation. | |
| 41 | |
| 42 class Mutex; | |
| 6026 | 43 template <class Chunk> class TreeList; |
| 44 template <class Chunk> class PrintTreeCensusClosure; | |
| 0 | 45 |
| 6026 | 46 template <class Chunk> |
| 0 | 47 class FreeList VALUE_OBJ_CLASS_SPEC { |
| 48 friend class CompactibleFreeListSpace; | |
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49 friend class VMStructs; |
| 6026 | 50 friend class PrintTreeCensusClosure<Chunk>; |
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51 |
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52 private: |
| 6026 | 53 Chunk* _head; // Head of list of free chunks |
| 54 Chunk* _tail; // Tail of list of free chunks | |
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55 size_t _size; // Size in Heap words of each chunk |
| 0 | 56 ssize_t _count; // Number of entries in list |
| 57 size_t _hint; // next larger size list with a positive surplus | |
| 58 | |
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59 AllocationStats _allocation_stats; // allocation-related statistics |
| 0 | 60 |
| 61 #ifdef ASSERT | |
| 62 Mutex* _protecting_lock; | |
| 63 #endif | |
| 64 | |
| 65 // Asserts false if the protecting lock (if any) is not held. | |
| 66 void assert_proper_lock_protection_work() const PRODUCT_RETURN; | |
| 67 void assert_proper_lock_protection() const { | |
| 68 #ifdef ASSERT | |
| 69 if (_protecting_lock != NULL) | |
| 70 assert_proper_lock_protection_work(); | |
| 71 #endif | |
| 72 } | |
| 73 | |
| 74 // Initialize the allocation statistics. | |
| 75 protected: | |
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76 void init_statistics(bool split_birth = false); |
| 0 | 77 void set_count(ssize_t v) { _count = v;} |
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78 void increment_count() { |
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79 _count++; |
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80 } |
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81 |
| 0 | 82 void decrement_count() { |
| 83 _count--; | |
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84 assert(_count >= 0, "Count should not be negative"); |
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85 } |
| 0 | 86 |
| 87 public: | |
| 88 // Constructor | |
| 89 // Construct a list without any entries. | |
| 90 FreeList(); | |
| 91 // Construct a list with "fc" as the first (and lone) entry in the list. | |
| 6026 | 92 FreeList(Chunk* fc); |
| 0 | 93 |
| 94 // Reset the head, tail, hint, and count of a free list. | |
| 95 void reset(size_t hint); | |
| 96 | |
| 97 // Declare the current free list to be protected by the given lock. | |
| 98 #ifdef ASSERT | |
| 99 void set_protecting_lock(Mutex* protecting_lock) { | |
| 100 _protecting_lock = protecting_lock; | |
| 101 } | |
| 102 #endif | |
| 103 | |
| 104 // Accessors. | |
| 6026 | 105 Chunk* head() const { |
| 0 | 106 assert_proper_lock_protection(); |
| 107 return _head; | |
| 108 } | |
| 6026 | 109 void set_head(Chunk* v) { |
| 0 | 110 assert_proper_lock_protection(); |
| 111 _head = v; | |
| 112 assert(!_head || _head->size() == _size, "bad chunk size"); | |
| 113 } | |
| 114 // Set the head of the list and set the prev field of non-null | |
| 115 // values to NULL. | |
| 6026 | 116 void link_head(Chunk* v) { |
| 0 | 117 assert_proper_lock_protection(); |
| 118 set_head(v); | |
| 119 // If this method is not used (just set the head instead), | |
| 120 // this check can be avoided. | |
| 121 if (v != NULL) { | |
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122 v->link_prev(NULL); |
| 0 | 123 } |
| 124 } | |
| 125 | |
| 6026 | 126 Chunk* tail() const { |
| 0 | 127 assert_proper_lock_protection(); |
| 128 return _tail; | |
| 129 } | |
| 6026 | 130 void set_tail(Chunk* v) { |
| 0 | 131 assert_proper_lock_protection(); |
| 132 _tail = v; | |
| 133 assert(!_tail || _tail->size() == _size, "bad chunk size"); | |
| 134 } | |
| 135 // Set the tail of the list and set the next field of non-null | |
| 136 // values to NULL. | |
| 6026 | 137 void link_tail(Chunk* v) { |
| 0 | 138 assert_proper_lock_protection(); |
| 139 set_tail(v); | |
| 140 if (v != NULL) { | |
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141 v->clear_next(); |
| 0 | 142 } |
| 143 } | |
| 144 | |
| 145 // No locking checks in read-accessors: lock-free reads (only) are benign. | |
| 146 // Readers are expected to have the lock if they are doing work that | |
| 147 // requires atomicity guarantees in sections of code. | |
| 148 size_t size() const { | |
| 149 return _size; | |
| 150 } | |
| 151 void set_size(size_t v) { | |
| 152 assert_proper_lock_protection(); | |
| 153 _size = v; | |
| 154 } | |
| 155 ssize_t count() const { | |
| 156 return _count; | |
| 157 } | |
| 158 size_t hint() const { | |
| 159 return _hint; | |
| 160 } | |
| 161 void set_hint(size_t v) { | |
| 162 assert_proper_lock_protection(); | |
| 163 assert(v == 0 || _size < v, "Bad hint"); _hint = v; | |
| 164 } | |
| 165 | |
| 166 // Accessors for statistics | |
| 167 AllocationStats* allocation_stats() { | |
| 168 assert_proper_lock_protection(); | |
| 169 return &_allocation_stats; | |
| 170 } | |
| 171 | |
| 172 ssize_t desired() const { | |
| 173 return _allocation_stats.desired(); | |
| 174 } | |
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175 void set_desired(ssize_t v) { |
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176 assert_proper_lock_protection(); |
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177 _allocation_stats.set_desired(v); |
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178 } |
| 0 | 179 void compute_desired(float inter_sweep_current, |
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180 float inter_sweep_estimate, |
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181 float intra_sweep_estimate) { |
| 0 | 182 assert_proper_lock_protection(); |
| 183 _allocation_stats.compute_desired(_count, | |
| 184 inter_sweep_current, | |
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185 inter_sweep_estimate, |
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186 intra_sweep_estimate); |
| 0 | 187 } |
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188 ssize_t coal_desired() const { |
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189 return _allocation_stats.coal_desired(); |
| 0 | 190 } |
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191 void set_coal_desired(ssize_t v) { |
| 0 | 192 assert_proper_lock_protection(); |
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193 _allocation_stats.set_coal_desired(v); |
| 0 | 194 } |
| 195 | |
| 196 ssize_t surplus() const { | |
| 197 return _allocation_stats.surplus(); | |
| 198 } | |
| 199 void set_surplus(ssize_t v) { | |
| 200 assert_proper_lock_protection(); | |
| 201 _allocation_stats.set_surplus(v); | |
| 202 } | |
| 203 void increment_surplus() { | |
| 204 assert_proper_lock_protection(); | |
| 205 _allocation_stats.increment_surplus(); | |
| 206 } | |
| 207 void decrement_surplus() { | |
| 208 assert_proper_lock_protection(); | |
| 209 _allocation_stats.decrement_surplus(); | |
| 210 } | |
| 211 | |
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212 ssize_t bfr_surp() const { |
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213 return _allocation_stats.bfr_surp(); |
| 0 | 214 } |
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215 void set_bfr_surp(ssize_t v) { |
| 0 | 216 assert_proper_lock_protection(); |
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217 _allocation_stats.set_bfr_surp(v); |
| 0 | 218 } |
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219 ssize_t prev_sweep() const { |
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220 return _allocation_stats.prev_sweep(); |
| 0 | 221 } |
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222 void set_prev_sweep(ssize_t v) { |
| 0 | 223 assert_proper_lock_protection(); |
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224 _allocation_stats.set_prev_sweep(v); |
| 0 | 225 } |
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226 ssize_t before_sweep() const { |
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227 return _allocation_stats.before_sweep(); |
| 0 | 228 } |
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229 void set_before_sweep(ssize_t v) { |
| 0 | 230 assert_proper_lock_protection(); |
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231 _allocation_stats.set_before_sweep(v); |
| 0 | 232 } |
| 233 | |
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234 ssize_t coal_births() const { |
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235 return _allocation_stats.coal_births(); |
| 0 | 236 } |
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237 void set_coal_births(ssize_t v) { |
| 0 | 238 assert_proper_lock_protection(); |
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239 _allocation_stats.set_coal_births(v); |
| 0 | 240 } |
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241 void increment_coal_births() { |
| 0 | 242 assert_proper_lock_protection(); |
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243 _allocation_stats.increment_coal_births(); |
| 0 | 244 } |
| 245 | |
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246 ssize_t coal_deaths() const { |
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247 return _allocation_stats.coal_deaths(); |
| 0 | 248 } |
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249 void set_coal_deaths(ssize_t v) { |
| 0 | 250 assert_proper_lock_protection(); |
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251 _allocation_stats.set_coal_deaths(v); |
| 0 | 252 } |
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253 void increment_coal_deaths() { |
| 0 | 254 assert_proper_lock_protection(); |
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255 _allocation_stats.increment_coal_deaths(); |
| 0 | 256 } |
| 257 | |
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258 ssize_t split_births() const { |
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259 return _allocation_stats.split_births(); |
| 0 | 260 } |
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261 void set_split_births(ssize_t v) { |
| 0 | 262 assert_proper_lock_protection(); |
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263 _allocation_stats.set_split_births(v); |
| 0 | 264 } |
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265 void increment_split_births() { |
| 0 | 266 assert_proper_lock_protection(); |
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267 _allocation_stats.increment_split_births(); |
| 0 | 268 } |
| 269 | |
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270 ssize_t split_deaths() const { |
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271 return _allocation_stats.split_deaths(); |
| 0 | 272 } |
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273 void set_split_deaths(ssize_t v) { |
| 0 | 274 assert_proper_lock_protection(); |
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275 _allocation_stats.set_split_deaths(v); |
| 0 | 276 } |
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277 void increment_split_deaths() { |
| 0 | 278 assert_proper_lock_protection(); |
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279 _allocation_stats.increment_split_deaths(); |
| 0 | 280 } |
| 281 | |
| 282 NOT_PRODUCT( | |
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283 // For debugging. The "_returned_bytes" in all the lists are summed |
| 0 | 284 // and compared with the total number of bytes swept during a |
| 285 // collection. | |
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286 size_t returned_bytes() const { return _allocation_stats.returned_bytes(); } |
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287 void set_returned_bytes(size_t v) { _allocation_stats.set_returned_bytes(v); } |
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288 void increment_returned_bytes_by(size_t v) { |
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289 _allocation_stats.set_returned_bytes(_allocation_stats.returned_bytes() + v); |
| 0 | 290 } |
| 291 ) | |
| 292 | |
| 293 // Unlink head of list and return it. Returns NULL if | |
| 294 // the list is empty. | |
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295 Chunk* get_chunk_at_head(); |
| 0 | 296 |
| 297 // Remove the first "n" or "count", whichever is smaller, chunks from the | |
| 298 // list, setting "fl", which is required to be empty, to point to them. | |
| 6026 | 299 void getFirstNChunksFromList(size_t n, FreeList<Chunk>* fl); |
| 0 | 300 |
| 301 // Unlink this chunk from it's free list | |
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302 void remove_chunk(Chunk* fc); |
| 0 | 303 |
| 304 // Add this chunk to this free list. | |
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305 void return_chunk_at_head(Chunk* fc); |
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306 void return_chunk_at_tail(Chunk* fc); |
| 0 | 307 |
| 308 // Similar to returnChunk* but also records some diagnostic | |
| 309 // information. | |
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310 void return_chunk_at_head(Chunk* fc, bool record_return); |
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311 void return_chunk_at_tail(Chunk* fc, bool record_return); |
| 0 | 312 |
| 313 // Prepend "fl" (whose size is required to be the same as that of "this") | |
| 314 // to the front of "this" list. | |
| 6026 | 315 void prepend(FreeList<Chunk>* fl); |
| 0 | 316 |
| 317 // Verify that the chunk is in the list. | |
| 318 // found. Return NULL if "fc" is not found. | |
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319 bool verify_chunk_in_free_list(Chunk* fc) const; |
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320 |
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321 // Stats verification |
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322 void verify_stats() const PRODUCT_RETURN; |
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323 |
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324 // Printing support |
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325 static void print_labels_on(outputStream* st, const char* c); |
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326 void print_on(outputStream* st, const char* c = NULL) const; |
| 0 | 327 }; |
| 1972 | 328 |
| 6026 | 329 #endif // SHARE_VM_MEMORY_FREELIST_HPP |