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annotate src/share/vm/memory/collectorPolicy.hpp @ 3109:3664989976e2
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author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Fri, 01 Jul 2011 12:57:10 +0200 |
parents | f95d63e2154a |
children | c9ca3f51cf41 |
rev | line source |
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0 | 1 /* |
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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 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |
26 #define SHARE_VM_MEMORY_COLLECTORPOLICY_HPP | |
27 | |
28 #include "memory/barrierSet.hpp" | |
29 #include "memory/genRemSet.hpp" | |
30 #include "memory/permGen.hpp" | |
31 | |
0 | 32 // This class (or more correctly, subtypes of this class) |
33 // are used to define global garbage collector attributes. | |
34 // This includes initialization of generations and any other | |
35 // shared resources they may need. | |
36 // | |
37 // In general, all flag adjustment and validation should be | |
38 // done in initialize_flags(), which is called prior to | |
39 // initialize_size_info(). | |
40 // | |
41 // This class is not fully developed yet. As more collector(s) | |
42 // are added, it is expected that we will come across further | |
43 // behavior that requires global attention. The correct place | |
44 // to deal with those issues is this class. | |
45 | |
46 // Forward declarations. | |
47 class GenCollectorPolicy; | |
48 class TwoGenerationCollectorPolicy; | |
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49 class AdaptiveSizePolicy; |
0 | 50 #ifndef SERIALGC |
51 class ConcurrentMarkSweepPolicy; | |
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52 class G1CollectorPolicy; |
0 | 53 #endif // SERIALGC |
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54 |
0 | 55 class GCPolicyCounters; |
56 class PermanentGenerationSpec; | |
57 class MarkSweepPolicy; | |
58 | |
59 class CollectorPolicy : public CHeapObj { | |
60 protected: | |
61 PermanentGenerationSpec *_permanent_generation; | |
62 GCPolicyCounters* _gc_policy_counters; | |
63 | |
64 // Requires that the concrete subclass sets the alignment constraints | |
65 // before calling. | |
66 virtual void initialize_flags(); | |
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67 virtual void initialize_size_info(); |
0 | 68 // Initialize "_permanent_generation" to a spec for the given kind of |
69 // Perm Gen. | |
70 void initialize_perm_generation(PermGen::Name pgnm); | |
71 | |
72 size_t _initial_heap_byte_size; | |
73 size_t _max_heap_byte_size; | |
74 size_t _min_heap_byte_size; | |
75 | |
76 size_t _min_alignment; | |
77 size_t _max_alignment; | |
78 | |
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79 // The sizing of the heap are controlled by a sizing policy. |
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80 AdaptiveSizePolicy* _size_policy; |
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81 |
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82 // Set to true when policy wants soft refs cleared. |
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83 // Reset to false by gc after it clears all soft refs. |
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84 bool _should_clear_all_soft_refs; |
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85 // Set to true by the GC if the just-completed gc cleared all |
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86 // softrefs. This is set to true whenever a gc clears all softrefs, and |
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87 // set to false each time gc returns to the mutator. For example, in the |
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88 // ParallelScavengeHeap case the latter would be done toward the end of |
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89 // mem_allocate() where it returns op.result() |
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90 bool _all_soft_refs_clear; |
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91 |
0 | 92 CollectorPolicy() : |
93 _min_alignment(1), | |
94 _max_alignment(1), | |
95 _initial_heap_byte_size(0), | |
96 _max_heap_byte_size(0), | |
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97 _min_heap_byte_size(0), |
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98 _size_policy(NULL), |
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99 _should_clear_all_soft_refs(false), |
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100 _all_soft_refs_clear(false) |
0 | 101 {} |
102 | |
103 public: | |
104 void set_min_alignment(size_t align) { _min_alignment = align; } | |
105 size_t min_alignment() { return _min_alignment; } | |
106 void set_max_alignment(size_t align) { _max_alignment = align; } | |
107 size_t max_alignment() { return _max_alignment; } | |
108 | |
109 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
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110 void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
0 | 111 size_t max_heap_byte_size() { return _max_heap_byte_size; } |
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112 void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
0 | 113 size_t min_heap_byte_size() { return _min_heap_byte_size; } |
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114 void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
0 | 115 |
116 enum Name { | |
117 CollectorPolicyKind, | |
118 TwoGenerationCollectorPolicyKind, | |
119 ConcurrentMarkSweepPolicyKind, | |
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120 ASConcurrentMarkSweepPolicyKind, |
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121 G1CollectorPolicyKind |
0 | 122 }; |
123 | |
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124 AdaptiveSizePolicy* size_policy() { return _size_policy; } |
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125 bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; } |
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126 void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; } |
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127 // Returns the current value of _should_clear_all_soft_refs. |
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128 // _should_clear_all_soft_refs is set to false as a side effect. |
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129 bool use_should_clear_all_soft_refs(bool v); |
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130 bool all_soft_refs_clear() { return _all_soft_refs_clear; } |
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131 void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; } |
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132 |
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133 // Called by the GC after Soft Refs have been cleared to indicate |
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134 // that the request in _should_clear_all_soft_refs has been fulfilled. |
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135 void cleared_all_soft_refs(); |
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136 |
0 | 137 // Identification methods. |
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138 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
0 | 139 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
140 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
141 #ifndef SERIALGC | |
142 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } | |
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143 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
0 | 144 #endif // SERIALGC |
145 // Note that these are not virtual. | |
146 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
147 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
148 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
149 #ifndef SERIALGC | |
150 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } | |
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151 bool is_g1_policy() { return as_g1_policy() != NULL; } |
0 | 152 #else // SERIALGC |
153 bool is_concurrent_mark_sweep_policy() { return false; } | |
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154 bool is_g1_policy() { return false; } |
0 | 155 #endif // SERIALGC |
156 | |
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157 |
0 | 158 virtual PermanentGenerationSpec *permanent_generation() { |
159 assert(_permanent_generation != NULL, "Sanity check"); | |
160 return _permanent_generation; | |
161 } | |
162 | |
163 virtual BarrierSet::Name barrier_set_name() = 0; | |
164 virtual GenRemSet::Name rem_set_name() = 0; | |
165 | |
166 // Create the remembered set (to cover the given reserved region, | |
167 // allowing breaking up into at most "max_covered_regions"). | |
168 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
169 int max_covered_regions); | |
170 | |
171 // This method controls how a collector satisfies a request | |
172 // for a block of memory. "gc_time_limit_was_exceeded" will | |
173 // be set to true if the adaptive size policy determine that | |
174 // an excessive amount of time is being spent doing collections | |
175 // and caused a NULL to be returned. If a NULL is not returned, | |
176 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
177 virtual HeapWord* mem_allocate_work(size_t size, | |
178 bool is_tlab, | |
179 bool* gc_overhead_limit_was_exceeded) = 0; | |
180 | |
181 // This method controls how a collector handles one or more | |
182 // of its generations being fully allocated. | |
183 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
184 // Performace Counter support | |
185 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
186 | |
187 // Create the jstat counters for the GC policy. By default, policy's | |
188 // don't have associated counters, and we complain if this is invoked. | |
189 virtual void initialize_gc_policy_counters() { | |
190 ShouldNotReachHere(); | |
191 } | |
192 | |
193 virtual CollectorPolicy::Name kind() { | |
194 return CollectorPolicy::CollectorPolicyKind; | |
195 } | |
196 | |
197 // Returns true if a collector has eden space with soft end. | |
198 virtual bool has_soft_ended_eden() { | |
199 return false; | |
200 } | |
201 | |
202 }; | |
203 | |
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204 class ClearedAllSoftRefs : public StackObj { |
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205 bool _clear_all_soft_refs; |
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206 CollectorPolicy* _collector_policy; |
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207 public: |
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208 ClearedAllSoftRefs(bool clear_all_soft_refs, |
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209 CollectorPolicy* collector_policy) : |
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210 _clear_all_soft_refs(clear_all_soft_refs), |
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211 _collector_policy(collector_policy) {} |
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212 |
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213 ~ClearedAllSoftRefs() { |
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214 if (_clear_all_soft_refs) { |
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215 _collector_policy->cleared_all_soft_refs(); |
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216 } |
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217 } |
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218 }; |
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219 |
0 | 220 class GenCollectorPolicy : public CollectorPolicy { |
221 protected: | |
222 size_t _min_gen0_size; | |
223 size_t _initial_gen0_size; | |
224 size_t _max_gen0_size; | |
225 | |
226 GenerationSpec **_generations; | |
227 | |
228 // Return true if an allocation should be attempted in the older | |
229 // generation if it fails in the younger generation. Return | |
230 // false, otherwise. | |
231 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
232 | |
233 void initialize_flags(); | |
234 void initialize_size_info(); | |
235 | |
236 // Try to allocate space by expanding the heap. | |
237 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
238 | |
239 // compute max heap alignment | |
240 size_t compute_max_alignment(); | |
241 | |
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242 // Scale the base_size by NewRation according to |
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243 // result = base_size / (NewRatio + 1) |
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244 // and align by min_alignment() |
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245 size_t scale_by_NewRatio_aligned(size_t base_size); |
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246 |
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247 // Bound the value by the given maximum minus the |
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248 // min_alignment. |
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249 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 250 |
251 public: | |
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252 // Accessors |
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253 size_t min_gen0_size() { return _min_gen0_size; } |
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254 void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
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255 size_t initial_gen0_size() { return _initial_gen0_size; } |
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256 void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
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257 size_t max_gen0_size() { return _max_gen0_size; } |
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258 void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
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259 |
0 | 260 virtual int number_of_generations() = 0; |
261 | |
262 virtual GenerationSpec **generations() { | |
263 assert(_generations != NULL, "Sanity check"); | |
264 return _generations; | |
265 } | |
266 | |
267 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
268 | |
269 virtual void initialize_generations() = 0; | |
270 | |
271 virtual void initialize_all() { | |
272 initialize_flags(); | |
273 initialize_size_info(); | |
274 initialize_generations(); | |
275 } | |
276 | |
277 HeapWord* mem_allocate_work(size_t size, | |
278 bool is_tlab, | |
279 bool* gc_overhead_limit_was_exceeded); | |
280 | |
281 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
282 | |
283 // The size that defines a "large array". | |
284 virtual size_t large_typearray_limit(); | |
285 | |
286 // Adaptive size policy | |
287 virtual void initialize_size_policy(size_t init_eden_size, | |
288 size_t init_promo_size, | |
289 size_t init_survivor_size); | |
290 }; | |
291 | |
292 // All of hotspot's current collectors are subtypes of this | |
293 // class. Currently, these collectors all use the same gen[0], | |
294 // but have different gen[1] types. If we add another subtype | |
295 // of CollectorPolicy, this class should be broken out into | |
296 // its own file. | |
297 | |
298 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
299 protected: | |
300 size_t _min_gen1_size; | |
301 size_t _initial_gen1_size; | |
302 size_t _max_gen1_size; | |
303 | |
304 void initialize_flags(); | |
305 void initialize_size_info(); | |
306 void initialize_generations() { ShouldNotReachHere(); } | |
307 | |
308 public: | |
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309 // Accessors |
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310 size_t min_gen1_size() { return _min_gen1_size; } |
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311 void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
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312 size_t initial_gen1_size() { return _initial_gen1_size; } |
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313 void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
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314 size_t max_gen1_size() { return _max_gen1_size; } |
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315 void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
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316 |
0 | 317 // Inherited methods |
318 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
319 | |
320 int number_of_generations() { return 2; } | |
321 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } | |
322 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
323 | |
324 virtual CollectorPolicy::Name kind() { | |
325 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
326 } | |
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327 |
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328 // Returns true is gen0 sizes were adjusted |
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329 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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330 size_t heap_size, size_t min_gen1_size); |
0 | 331 }; |
332 | |
333 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
334 protected: | |
335 void initialize_generations(); | |
336 | |
337 public: | |
338 MarkSweepPolicy(); | |
339 | |
340 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
341 | |
342 void initialize_gc_policy_counters(); | |
343 }; | |
1972 | 344 |
345 #endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |