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annotate src/share/vm/memory/collectorPolicy.hpp @ 1764:14197af1010e
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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 | |
25 // This class (or more correctly, subtypes of this class) | |
26 // are used to define global garbage collector attributes. | |
27 // This includes initialization of generations and any other | |
28 // shared resources they may need. | |
29 // | |
30 // In general, all flag adjustment and validation should be | |
31 // done in initialize_flags(), which is called prior to | |
32 // initialize_size_info(). | |
33 // | |
34 // This class is not fully developed yet. As more collector(s) | |
35 // are added, it is expected that we will come across further | |
36 // behavior that requires global attention. The correct place | |
37 // to deal with those issues is this class. | |
38 | |
39 // Forward declarations. | |
40 class GenCollectorPolicy; | |
41 class TwoGenerationCollectorPolicy; | |
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42 class AdaptiveSizePolicy; |
0 | 43 #ifndef SERIALGC |
44 class ConcurrentMarkSweepPolicy; | |
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45 class G1CollectorPolicy; |
0 | 46 #endif // SERIALGC |
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47 |
0 | 48 class GCPolicyCounters; |
49 class PermanentGenerationSpec; | |
50 class MarkSweepPolicy; | |
51 | |
52 class CollectorPolicy : public CHeapObj { | |
53 protected: | |
54 PermanentGenerationSpec *_permanent_generation; | |
55 GCPolicyCounters* _gc_policy_counters; | |
56 | |
57 // Requires that the concrete subclass sets the alignment constraints | |
58 // before calling. | |
59 virtual void initialize_flags(); | |
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60 virtual void initialize_size_info(); |
0 | 61 // Initialize "_permanent_generation" to a spec for the given kind of |
62 // Perm Gen. | |
63 void initialize_perm_generation(PermGen::Name pgnm); | |
64 | |
65 size_t _initial_heap_byte_size; | |
66 size_t _max_heap_byte_size; | |
67 size_t _min_heap_byte_size; | |
68 | |
69 size_t _min_alignment; | |
70 size_t _max_alignment; | |
71 | |
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72 // The sizing of the heap are controlled by a sizing policy. |
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73 AdaptiveSizePolicy* _size_policy; |
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74 |
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75 // Set to true when policy wants soft refs cleared. |
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76 // Reset to false by gc after it clears all soft refs. |
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77 bool _should_clear_all_soft_refs; |
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78 // Set to true by the GC if the just-completed gc cleared all |
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79 // softrefs. This is set to true whenever a gc clears all softrefs, and |
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80 // set to false each time gc returns to the mutator. For example, in the |
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81 // ParallelScavengeHeap case the latter would be done toward the end of |
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82 // mem_allocate() where it returns op.result() |
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83 bool _all_soft_refs_clear; |
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84 |
0 | 85 CollectorPolicy() : |
86 _min_alignment(1), | |
87 _max_alignment(1), | |
88 _initial_heap_byte_size(0), | |
89 _max_heap_byte_size(0), | |
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90 _min_heap_byte_size(0), |
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91 _size_policy(NULL), |
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92 _should_clear_all_soft_refs(false), |
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93 _all_soft_refs_clear(false) |
0 | 94 {} |
95 | |
96 public: | |
97 void set_min_alignment(size_t align) { _min_alignment = align; } | |
98 size_t min_alignment() { return _min_alignment; } | |
99 void set_max_alignment(size_t align) { _max_alignment = align; } | |
100 size_t max_alignment() { return _max_alignment; } | |
101 | |
102 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
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103 void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
0 | 104 size_t max_heap_byte_size() { return _max_heap_byte_size; } |
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105 void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
0 | 106 size_t min_heap_byte_size() { return _min_heap_byte_size; } |
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107 void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
0 | 108 |
109 enum Name { | |
110 CollectorPolicyKind, | |
111 TwoGenerationCollectorPolicyKind, | |
112 ConcurrentMarkSweepPolicyKind, | |
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113 ASConcurrentMarkSweepPolicyKind, |
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114 G1CollectorPolicyKind |
0 | 115 }; |
116 | |
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117 AdaptiveSizePolicy* size_policy() { return _size_policy; } |
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118 bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; } |
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119 void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; } |
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120 // Returns the current value of _should_clear_all_soft_refs. |
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121 // _should_clear_all_soft_refs is set to false as a side effect. |
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122 bool use_should_clear_all_soft_refs(bool v); |
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123 bool all_soft_refs_clear() { return _all_soft_refs_clear; } |
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124 void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; } |
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125 |
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126 // Called by the GC after Soft Refs have been cleared to indicate |
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127 // that the request in _should_clear_all_soft_refs has been fulfilled. |
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128 void cleared_all_soft_refs(); |
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129 |
0 | 130 // Identification methods. |
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131 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
0 | 132 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
133 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
134 #ifndef SERIALGC | |
135 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } | |
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136 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
0 | 137 #endif // SERIALGC |
138 // Note that these are not virtual. | |
139 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
140 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
141 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
142 #ifndef SERIALGC | |
143 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } | |
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144 bool is_g1_policy() { return as_g1_policy() != NULL; } |
0 | 145 #else // SERIALGC |
146 bool is_concurrent_mark_sweep_policy() { return false; } | |
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147 bool is_g1_policy() { return false; } |
0 | 148 #endif // SERIALGC |
149 | |
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150 |
0 | 151 virtual PermanentGenerationSpec *permanent_generation() { |
152 assert(_permanent_generation != NULL, "Sanity check"); | |
153 return _permanent_generation; | |
154 } | |
155 | |
156 virtual BarrierSet::Name barrier_set_name() = 0; | |
157 virtual GenRemSet::Name rem_set_name() = 0; | |
158 | |
159 // Create the remembered set (to cover the given reserved region, | |
160 // allowing breaking up into at most "max_covered_regions"). | |
161 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
162 int max_covered_regions); | |
163 | |
164 // This method controls how a collector satisfies a request | |
165 // for a block of memory. "gc_time_limit_was_exceeded" will | |
166 // be set to true if the adaptive size policy determine that | |
167 // an excessive amount of time is being spent doing collections | |
168 // and caused a NULL to be returned. If a NULL is not returned, | |
169 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
170 virtual HeapWord* mem_allocate_work(size_t size, | |
171 bool is_tlab, | |
172 bool* gc_overhead_limit_was_exceeded) = 0; | |
173 | |
174 // This method controls how a collector handles one or more | |
175 // of its generations being fully allocated. | |
176 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
177 // Performace Counter support | |
178 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
179 | |
180 // Create the jstat counters for the GC policy. By default, policy's | |
181 // don't have associated counters, and we complain if this is invoked. | |
182 virtual void initialize_gc_policy_counters() { | |
183 ShouldNotReachHere(); | |
184 } | |
185 | |
186 virtual CollectorPolicy::Name kind() { | |
187 return CollectorPolicy::CollectorPolicyKind; | |
188 } | |
189 | |
190 // Returns true if a collector has eden space with soft end. | |
191 virtual bool has_soft_ended_eden() { | |
192 return false; | |
193 } | |
194 | |
195 }; | |
196 | |
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197 class ClearedAllSoftRefs : public StackObj { |
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198 bool _clear_all_soft_refs; |
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199 CollectorPolicy* _collector_policy; |
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200 public: |
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201 ClearedAllSoftRefs(bool clear_all_soft_refs, |
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202 CollectorPolicy* collector_policy) : |
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203 _clear_all_soft_refs(clear_all_soft_refs), |
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204 _collector_policy(collector_policy) {} |
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205 |
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206 ~ClearedAllSoftRefs() { |
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207 if (_clear_all_soft_refs) { |
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208 _collector_policy->cleared_all_soft_refs(); |
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209 } |
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210 } |
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211 }; |
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212 |
0 | 213 class GenCollectorPolicy : public CollectorPolicy { |
214 protected: | |
215 size_t _min_gen0_size; | |
216 size_t _initial_gen0_size; | |
217 size_t _max_gen0_size; | |
218 | |
219 GenerationSpec **_generations; | |
220 | |
221 // Return true if an allocation should be attempted in the older | |
222 // generation if it fails in the younger generation. Return | |
223 // false, otherwise. | |
224 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
225 | |
226 void initialize_flags(); | |
227 void initialize_size_info(); | |
228 | |
229 // Try to allocate space by expanding the heap. | |
230 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
231 | |
232 // compute max heap alignment | |
233 size_t compute_max_alignment(); | |
234 | |
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235 // Scale the base_size by NewRation according to |
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236 // result = base_size / (NewRatio + 1) |
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237 // and align by min_alignment() |
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238 size_t scale_by_NewRatio_aligned(size_t base_size); |
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239 |
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240 // Bound the value by the given maximum minus the |
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241 // min_alignment. |
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242 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 243 |
244 public: | |
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245 // Accessors |
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246 size_t min_gen0_size() { return _min_gen0_size; } |
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247 void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
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248 size_t initial_gen0_size() { return _initial_gen0_size; } |
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249 void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
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250 size_t max_gen0_size() { return _max_gen0_size; } |
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251 void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
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252 |
0 | 253 virtual int number_of_generations() = 0; |
254 | |
255 virtual GenerationSpec **generations() { | |
256 assert(_generations != NULL, "Sanity check"); | |
257 return _generations; | |
258 } | |
259 | |
260 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
261 | |
262 virtual void initialize_generations() = 0; | |
263 | |
264 virtual void initialize_all() { | |
265 initialize_flags(); | |
266 initialize_size_info(); | |
267 initialize_generations(); | |
268 } | |
269 | |
270 HeapWord* mem_allocate_work(size_t size, | |
271 bool is_tlab, | |
272 bool* gc_overhead_limit_was_exceeded); | |
273 | |
274 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
275 | |
276 // The size that defines a "large array". | |
277 virtual size_t large_typearray_limit(); | |
278 | |
279 // Adaptive size policy | |
280 virtual void initialize_size_policy(size_t init_eden_size, | |
281 size_t init_promo_size, | |
282 size_t init_survivor_size); | |
283 }; | |
284 | |
285 // All of hotspot's current collectors are subtypes of this | |
286 // class. Currently, these collectors all use the same gen[0], | |
287 // but have different gen[1] types. If we add another subtype | |
288 // of CollectorPolicy, this class should be broken out into | |
289 // its own file. | |
290 | |
291 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
292 protected: | |
293 size_t _min_gen1_size; | |
294 size_t _initial_gen1_size; | |
295 size_t _max_gen1_size; | |
296 | |
297 void initialize_flags(); | |
298 void initialize_size_info(); | |
299 void initialize_generations() { ShouldNotReachHere(); } | |
300 | |
301 public: | |
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302 // Accessors |
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303 size_t min_gen1_size() { return _min_gen1_size; } |
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304 void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
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305 size_t initial_gen1_size() { return _initial_gen1_size; } |
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306 void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
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307 size_t max_gen1_size() { return _max_gen1_size; } |
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308 void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
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309 |
0 | 310 // Inherited methods |
311 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
312 | |
313 int number_of_generations() { return 2; } | |
314 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } | |
315 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
316 | |
317 virtual CollectorPolicy::Name kind() { | |
318 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
319 } | |
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320 |
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321 // Returns true is gen0 sizes were adjusted |
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322 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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323 size_t heap_size, size_t min_gen1_size); |
0 | 324 }; |
325 | |
326 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
327 protected: | |
328 void initialize_generations(); | |
329 | |
330 public: | |
331 MarkSweepPolicy(); | |
332 | |
333 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
334 | |
335 void initialize_gc_policy_counters(); | |
336 }; |