Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/freeList.hpp @ 12:6432c3bb6240
6668743: CMS: Consolidate block statistics reporting code
Summary: Reduce the amount of related code replication and improve pretty printing.
Reviewed-by: jmasa
author | ysr |
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date | Fri, 29 Feb 2008 14:42:56 -0800 |
parents | a61af66fc99e |
children | c70a245cad3a |
rev | line source |
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0 | 1 /* |
2 * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class CompactibleFreeListSpace; | |
26 | |
27 // A class for maintaining a free list of FreeChunk's. The FreeList | |
28 // maintains a the structure of the list (head, tail, etc.) plus | |
29 // statistics for allocations from the list. The links between items | |
30 // are not part of FreeList. The statistics are | |
31 // used to make decisions about coalescing FreeChunk's when they | |
32 // are swept during collection. | |
33 // | |
34 // See the corresponding .cpp file for a description of the specifics | |
35 // for that implementation. | |
36 | |
37 class Mutex; | |
38 | |
39 class FreeList VALUE_OBJ_CLASS_SPEC { | |
40 friend class CompactibleFreeListSpace; | |
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41 friend class printTreeCensusClosure; |
0 | 42 FreeChunk* _head; // List of free chunks |
43 FreeChunk* _tail; // Tail of list of free chunks | |
44 size_t _size; // Size in Heap words of each chunks | |
45 ssize_t _count; // Number of entries in list | |
46 size_t _hint; // next larger size list with a positive surplus | |
47 | |
48 AllocationStats _allocation_stats; // statistics for smart allocation | |
49 | |
50 #ifdef ASSERT | |
51 Mutex* _protecting_lock; | |
52 #endif | |
53 | |
54 // Asserts false if the protecting lock (if any) is not held. | |
55 void assert_proper_lock_protection_work() const PRODUCT_RETURN; | |
56 void assert_proper_lock_protection() const { | |
57 #ifdef ASSERT | |
58 if (_protecting_lock != NULL) | |
59 assert_proper_lock_protection_work(); | |
60 #endif | |
61 } | |
62 | |
63 // Initialize the allocation statistics. | |
64 protected: | |
65 void init_statistics(); | |
66 void set_count(ssize_t v) { _count = v;} | |
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67 void increment_count() { _count++; } |
0 | 68 void decrement_count() { |
69 _count--; | |
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70 assert(_count >= 0, "Count should not be negative"); |
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71 } |
0 | 72 |
73 public: | |
74 // Constructor | |
75 // Construct a list without any entries. | |
76 FreeList(); | |
77 // Construct a list with "fc" as the first (and lone) entry in the list. | |
78 FreeList(FreeChunk* fc); | |
79 // Construct a list which will have a FreeChunk at address "addr" and | |
80 // of size "size" as the first (and lone) entry in the list. | |
81 FreeList(HeapWord* addr, size_t size); | |
82 | |
83 // Reset the head, tail, hint, and count of a free list. | |
84 void reset(size_t hint); | |
85 | |
86 // Declare the current free list to be protected by the given lock. | |
87 #ifdef ASSERT | |
88 void set_protecting_lock(Mutex* protecting_lock) { | |
89 _protecting_lock = protecting_lock; | |
90 } | |
91 #endif | |
92 | |
93 // Accessors. | |
94 FreeChunk* head() const { | |
95 assert_proper_lock_protection(); | |
96 return _head; | |
97 } | |
98 void set_head(FreeChunk* v) { | |
99 assert_proper_lock_protection(); | |
100 _head = v; | |
101 assert(!_head || _head->size() == _size, "bad chunk size"); | |
102 } | |
103 // Set the head of the list and set the prev field of non-null | |
104 // values to NULL. | |
105 void link_head(FreeChunk* v) { | |
106 assert_proper_lock_protection(); | |
107 set_head(v); | |
108 // If this method is not used (just set the head instead), | |
109 // this check can be avoided. | |
110 if (v != NULL) { | |
111 v->linkPrev(NULL); | |
112 } | |
113 } | |
114 | |
115 FreeChunk* tail() const { | |
116 assert_proper_lock_protection(); | |
117 return _tail; | |
118 } | |
119 void set_tail(FreeChunk* v) { | |
120 assert_proper_lock_protection(); | |
121 _tail = v; | |
122 assert(!_tail || _tail->size() == _size, "bad chunk size"); | |
123 } | |
124 // Set the tail of the list and set the next field of non-null | |
125 // values to NULL. | |
126 void link_tail(FreeChunk* v) { | |
127 assert_proper_lock_protection(); | |
128 set_tail(v); | |
129 if (v != NULL) { | |
130 v->clearNext(); | |
131 } | |
132 } | |
133 | |
134 // No locking checks in read-accessors: lock-free reads (only) are benign. | |
135 // Readers are expected to have the lock if they are doing work that | |
136 // requires atomicity guarantees in sections of code. | |
137 size_t size() const { | |
138 return _size; | |
139 } | |
140 void set_size(size_t v) { | |
141 assert_proper_lock_protection(); | |
142 _size = v; | |
143 } | |
144 ssize_t count() const { | |
145 return _count; | |
146 } | |
147 size_t hint() const { | |
148 return _hint; | |
149 } | |
150 void set_hint(size_t v) { | |
151 assert_proper_lock_protection(); | |
152 assert(v == 0 || _size < v, "Bad hint"); _hint = v; | |
153 } | |
154 | |
155 // Accessors for statistics | |
156 AllocationStats* allocation_stats() { | |
157 assert_proper_lock_protection(); | |
158 return &_allocation_stats; | |
159 } | |
160 | |
161 ssize_t desired() const { | |
162 return _allocation_stats.desired(); | |
163 } | |
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164 void set_desired(ssize_t v) { |
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165 assert_proper_lock_protection(); |
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166 _allocation_stats.set_desired(v); |
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167 } |
0 | 168 void compute_desired(float inter_sweep_current, |
169 float inter_sweep_estimate) { | |
170 assert_proper_lock_protection(); | |
171 _allocation_stats.compute_desired(_count, | |
172 inter_sweep_current, | |
173 inter_sweep_estimate); | |
174 } | |
175 ssize_t coalDesired() const { | |
176 return _allocation_stats.coalDesired(); | |
177 } | |
178 void set_coalDesired(ssize_t v) { | |
179 assert_proper_lock_protection(); | |
180 _allocation_stats.set_coalDesired(v); | |
181 } | |
182 | |
183 ssize_t surplus() const { | |
184 return _allocation_stats.surplus(); | |
185 } | |
186 void set_surplus(ssize_t v) { | |
187 assert_proper_lock_protection(); | |
188 _allocation_stats.set_surplus(v); | |
189 } | |
190 void increment_surplus() { | |
191 assert_proper_lock_protection(); | |
192 _allocation_stats.increment_surplus(); | |
193 } | |
194 void decrement_surplus() { | |
195 assert_proper_lock_protection(); | |
196 _allocation_stats.decrement_surplus(); | |
197 } | |
198 | |
199 ssize_t bfrSurp() const { | |
200 return _allocation_stats.bfrSurp(); | |
201 } | |
202 void set_bfrSurp(ssize_t v) { | |
203 assert_proper_lock_protection(); | |
204 _allocation_stats.set_bfrSurp(v); | |
205 } | |
206 ssize_t prevSweep() const { | |
207 return _allocation_stats.prevSweep(); | |
208 } | |
209 void set_prevSweep(ssize_t v) { | |
210 assert_proper_lock_protection(); | |
211 _allocation_stats.set_prevSweep(v); | |
212 } | |
213 ssize_t beforeSweep() const { | |
214 return _allocation_stats.beforeSweep(); | |
215 } | |
216 void set_beforeSweep(ssize_t v) { | |
217 assert_proper_lock_protection(); | |
218 _allocation_stats.set_beforeSweep(v); | |
219 } | |
220 | |
221 ssize_t coalBirths() const { | |
222 return _allocation_stats.coalBirths(); | |
223 } | |
224 void set_coalBirths(ssize_t v) { | |
225 assert_proper_lock_protection(); | |
226 _allocation_stats.set_coalBirths(v); | |
227 } | |
228 void increment_coalBirths() { | |
229 assert_proper_lock_protection(); | |
230 _allocation_stats.increment_coalBirths(); | |
231 } | |
232 | |
233 ssize_t coalDeaths() const { | |
234 return _allocation_stats.coalDeaths(); | |
235 } | |
236 void set_coalDeaths(ssize_t v) { | |
237 assert_proper_lock_protection(); | |
238 _allocation_stats.set_coalDeaths(v); | |
239 } | |
240 void increment_coalDeaths() { | |
241 assert_proper_lock_protection(); | |
242 _allocation_stats.increment_coalDeaths(); | |
243 } | |
244 | |
245 ssize_t splitBirths() const { | |
246 return _allocation_stats.splitBirths(); | |
247 } | |
248 void set_splitBirths(ssize_t v) { | |
249 assert_proper_lock_protection(); | |
250 _allocation_stats.set_splitBirths(v); | |
251 } | |
252 void increment_splitBirths() { | |
253 assert_proper_lock_protection(); | |
254 _allocation_stats.increment_splitBirths(); | |
255 } | |
256 | |
257 ssize_t splitDeaths() const { | |
258 return _allocation_stats.splitDeaths(); | |
259 } | |
260 void set_splitDeaths(ssize_t v) { | |
261 assert_proper_lock_protection(); | |
262 _allocation_stats.set_splitDeaths(v); | |
263 } | |
264 void increment_splitDeaths() { | |
265 assert_proper_lock_protection(); | |
266 _allocation_stats.increment_splitDeaths(); | |
267 } | |
268 | |
269 NOT_PRODUCT( | |
270 // For debugging. The "_returnedBytes" in all the lists are summed | |
271 // and compared with the total number of bytes swept during a | |
272 // collection. | |
273 size_t returnedBytes() const { return _allocation_stats.returnedBytes(); } | |
274 void set_returnedBytes(size_t v) { _allocation_stats.set_returnedBytes(v); } | |
275 void increment_returnedBytes_by(size_t v) { | |
276 _allocation_stats.set_returnedBytes(_allocation_stats.returnedBytes() + v); | |
277 } | |
278 ) | |
279 | |
280 // Unlink head of list and return it. Returns NULL if | |
281 // the list is empty. | |
282 FreeChunk* getChunkAtHead(); | |
283 | |
284 // Remove the first "n" or "count", whichever is smaller, chunks from the | |
285 // list, setting "fl", which is required to be empty, to point to them. | |
286 void getFirstNChunksFromList(size_t n, FreeList* fl); | |
287 | |
288 // Unlink this chunk from it's free list | |
289 void removeChunk(FreeChunk* fc); | |
290 | |
291 // Add this chunk to this free list. | |
292 void returnChunkAtHead(FreeChunk* fc); | |
293 void returnChunkAtTail(FreeChunk* fc); | |
294 | |
295 // Similar to returnChunk* but also records some diagnostic | |
296 // information. | |
297 void returnChunkAtHead(FreeChunk* fc, bool record_return); | |
298 void returnChunkAtTail(FreeChunk* fc, bool record_return); | |
299 | |
300 // Prepend "fl" (whose size is required to be the same as that of "this") | |
301 // to the front of "this" list. | |
302 void prepend(FreeList* fl); | |
303 | |
304 // Verify that the chunk is in the list. | |
305 // found. Return NULL if "fc" is not found. | |
306 bool verifyChunkInFreeLists(FreeChunk* fc) const; | |
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307 |
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308 // Printing support |
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309 static void print_labels_on(outputStream* st, const char* c); |
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310 void print_on(outputStream* st, const char* c = NULL) const; |
0 | 311 }; |