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annotate src/share/vm/memory/collectorPolicy.hpp @ 7788:dbbe8ce3bfa5
commands: accept 'server0' as a vm, accept version number which have '-...' suffix (-internal, -ea...)
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 13 Feb 2013 18:33:54 +0100 |
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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 #ifndef SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |
26 #define SHARE_VM_MEMORY_COLLECTORPOLICY_HPP | |
27 | |
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28 #include "memory/allocation.hpp" |
1972 | 29 #include "memory/barrierSet.hpp" |
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30 #include "memory/generationSpec.hpp" |
1972 | 31 #include "memory/genRemSet.hpp" |
32 | |
0 | 33 // This class (or more correctly, subtypes of this class) |
34 // are used to define global garbage collector attributes. | |
35 // This includes initialization of generations and any other | |
36 // shared resources they may need. | |
37 // | |
38 // In general, all flag adjustment and validation should be | |
39 // done in initialize_flags(), which is called prior to | |
40 // initialize_size_info(). | |
41 // | |
42 // This class is not fully developed yet. As more collector(s) | |
43 // are added, it is expected that we will come across further | |
44 // behavior that requires global attention. The correct place | |
45 // to deal with those issues is this class. | |
46 | |
47 // Forward declarations. | |
48 class GenCollectorPolicy; | |
49 class TwoGenerationCollectorPolicy; | |
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50 class AdaptiveSizePolicy; |
0 | 51 #ifndef SERIALGC |
52 class ConcurrentMarkSweepPolicy; | |
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53 class G1CollectorPolicy; |
0 | 54 #endif // SERIALGC |
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55 |
0 | 56 class GCPolicyCounters; |
57 class MarkSweepPolicy; | |
58 | |
6197 | 59 class CollectorPolicy : public CHeapObj<mtGC> { |
0 | 60 protected: |
61 GCPolicyCounters* _gc_policy_counters; | |
62 | |
63 // Requires that the concrete subclass sets the alignment constraints | |
64 // before calling. | |
65 virtual void initialize_flags(); | |
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66 virtual void initialize_size_info(); |
0 | 67 |
68 size_t _initial_heap_byte_size; | |
69 size_t _max_heap_byte_size; | |
70 size_t _min_heap_byte_size; | |
71 | |
72 size_t _min_alignment; | |
73 size_t _max_alignment; | |
74 | |
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75 // The sizing of the heap are controlled by a sizing policy. |
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76 AdaptiveSizePolicy* _size_policy; |
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77 |
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78 // Set to true when policy wants soft refs cleared. |
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79 // Reset to false by gc after it clears all soft refs. |
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80 bool _should_clear_all_soft_refs; |
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81 // Set to true by the GC if the just-completed gc cleared all |
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82 // softrefs. This is set to true whenever a gc clears all softrefs, and |
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83 // set to false each time gc returns to the mutator. For example, in the |
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84 // ParallelScavengeHeap case the latter would be done toward the end of |
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85 // mem_allocate() where it returns op.result() |
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86 bool _all_soft_refs_clear; |
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87 |
0 | 88 CollectorPolicy() : |
89 _min_alignment(1), | |
90 _max_alignment(1), | |
91 _initial_heap_byte_size(0), | |
92 _max_heap_byte_size(0), | |
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93 _min_heap_byte_size(0), |
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94 _size_policy(NULL), |
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95 _should_clear_all_soft_refs(false), |
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96 _all_soft_refs_clear(false) |
0 | 97 {} |
98 | |
99 public: | |
100 void set_min_alignment(size_t align) { _min_alignment = align; } | |
101 size_t min_alignment() { return _min_alignment; } | |
102 void set_max_alignment(size_t align) { _max_alignment = align; } | |
103 size_t max_alignment() { return _max_alignment; } | |
104 | |
105 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
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106 void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
0 | 107 size_t max_heap_byte_size() { return _max_heap_byte_size; } |
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108 void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
0 | 109 size_t min_heap_byte_size() { return _min_heap_byte_size; } |
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110 void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
0 | 111 |
112 enum Name { | |
113 CollectorPolicyKind, | |
114 TwoGenerationCollectorPolicyKind, | |
115 ConcurrentMarkSweepPolicyKind, | |
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116 ASConcurrentMarkSweepPolicyKind, |
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117 G1CollectorPolicyKind |
0 | 118 }; |
119 | |
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120 AdaptiveSizePolicy* size_policy() { return _size_policy; } |
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121 bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; } |
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122 void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; } |
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123 // Returns the current value of _should_clear_all_soft_refs. |
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124 // _should_clear_all_soft_refs is set to false as a side effect. |
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125 bool use_should_clear_all_soft_refs(bool v); |
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126 bool all_soft_refs_clear() { return _all_soft_refs_clear; } |
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127 void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; } |
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128 |
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129 // Called by the GC after Soft Refs have been cleared to indicate |
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130 // that the request in _should_clear_all_soft_refs has been fulfilled. |
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131 void cleared_all_soft_refs(); |
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132 |
0 | 133 // Identification methods. |
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134 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
0 | 135 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
136 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
137 #ifndef SERIALGC | |
138 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } | |
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139 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
0 | 140 #endif // SERIALGC |
141 // Note that these are not virtual. | |
142 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
143 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
144 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
145 #ifndef SERIALGC | |
146 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } | |
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147 bool is_g1_policy() { return as_g1_policy() != NULL; } |
0 | 148 #else // SERIALGC |
149 bool is_concurrent_mark_sweep_policy() { return false; } | |
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150 bool is_g1_policy() { return false; } |
0 | 151 #endif // SERIALGC |
152 | |
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153 |
0 | 154 virtual BarrierSet::Name barrier_set_name() = 0; |
155 virtual GenRemSet::Name rem_set_name() = 0; | |
156 | |
157 // Create the remembered set (to cover the given reserved region, | |
158 // allowing breaking up into at most "max_covered_regions"). | |
159 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
160 int max_covered_regions); | |
161 | |
162 // This method controls how a collector satisfies a request | |
163 // for a block of memory. "gc_time_limit_was_exceeded" will | |
164 // be set to true if the adaptive size policy determine that | |
165 // an excessive amount of time is being spent doing collections | |
166 // and caused a NULL to be returned. If a NULL is not returned, | |
167 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
168 virtual HeapWord* mem_allocate_work(size_t size, | |
169 bool is_tlab, | |
170 bool* gc_overhead_limit_was_exceeded) = 0; | |
171 | |
172 // This method controls how a collector handles one or more | |
173 // of its generations being fully allocated. | |
174 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
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175 // This method controls how a collector handles a metadata allocation |
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176 // failure. |
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177 virtual MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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178 size_t size, |
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179 Metaspace::MetadataType mdtype); |
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180 |
0 | 181 // Performace Counter support |
182 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
183 | |
184 // Create the jstat counters for the GC policy. By default, policy's | |
185 // don't have associated counters, and we complain if this is invoked. | |
186 virtual void initialize_gc_policy_counters() { | |
187 ShouldNotReachHere(); | |
188 } | |
189 | |
190 virtual CollectorPolicy::Name kind() { | |
191 return CollectorPolicy::CollectorPolicyKind; | |
192 } | |
193 | |
194 // Returns true if a collector has eden space with soft end. | |
195 virtual bool has_soft_ended_eden() { | |
196 return false; | |
197 } | |
198 | |
199 }; | |
200 | |
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201 class ClearedAllSoftRefs : public StackObj { |
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202 bool _clear_all_soft_refs; |
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203 CollectorPolicy* _collector_policy; |
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204 public: |
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205 ClearedAllSoftRefs(bool clear_all_soft_refs, |
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206 CollectorPolicy* collector_policy) : |
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207 _clear_all_soft_refs(clear_all_soft_refs), |
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208 _collector_policy(collector_policy) {} |
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209 |
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210 ~ClearedAllSoftRefs() { |
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211 if (_clear_all_soft_refs) { |
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212 _collector_policy->cleared_all_soft_refs(); |
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213 } |
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214 } |
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215 }; |
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216 |
0 | 217 class GenCollectorPolicy : public CollectorPolicy { |
218 protected: | |
219 size_t _min_gen0_size; | |
220 size_t _initial_gen0_size; | |
221 size_t _max_gen0_size; | |
222 | |
223 GenerationSpec **_generations; | |
224 | |
225 // Return true if an allocation should be attempted in the older | |
226 // generation if it fails in the younger generation. Return | |
227 // false, otherwise. | |
228 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
229 | |
230 void initialize_flags(); | |
231 void initialize_size_info(); | |
232 | |
233 // Try to allocate space by expanding the heap. | |
234 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
235 | |
236 // compute max heap alignment | |
237 size_t compute_max_alignment(); | |
238 | |
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239 // Scale the base_size by NewRation according to |
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240 // result = base_size / (NewRatio + 1) |
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241 // and align by min_alignment() |
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242 size_t scale_by_NewRatio_aligned(size_t base_size); |
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243 |
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244 // Bound the value by the given maximum minus the |
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245 // min_alignment. |
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246 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 247 |
248 public: | |
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249 // Accessors |
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250 size_t min_gen0_size() { return _min_gen0_size; } |
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251 void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
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252 size_t initial_gen0_size() { return _initial_gen0_size; } |
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253 void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
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254 size_t max_gen0_size() { return _max_gen0_size; } |
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255 void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
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256 |
0 | 257 virtual int number_of_generations() = 0; |
258 | |
259 virtual GenerationSpec **generations() { | |
260 assert(_generations != NULL, "Sanity check"); | |
261 return _generations; | |
262 } | |
263 | |
264 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
265 | |
266 virtual void initialize_generations() = 0; | |
267 | |
268 virtual void initialize_all() { | |
269 initialize_flags(); | |
270 initialize_size_info(); | |
271 initialize_generations(); | |
272 } | |
273 | |
274 HeapWord* mem_allocate_work(size_t size, | |
275 bool is_tlab, | |
276 bool* gc_overhead_limit_was_exceeded); | |
277 | |
278 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
279 | |
280 // Adaptive size policy | |
281 virtual void initialize_size_policy(size_t init_eden_size, | |
282 size_t init_promo_size, | |
283 size_t init_survivor_size); | |
284 }; | |
285 | |
286 // All of hotspot's current collectors are subtypes of this | |
287 // class. Currently, these collectors all use the same gen[0], | |
288 // but have different gen[1] types. If we add another subtype | |
289 // of CollectorPolicy, this class should be broken out into | |
290 // its own file. | |
291 | |
292 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
293 protected: | |
294 size_t _min_gen1_size; | |
295 size_t _initial_gen1_size; | |
296 size_t _max_gen1_size; | |
297 | |
298 void initialize_flags(); | |
299 void initialize_size_info(); | |
300 void initialize_generations() { ShouldNotReachHere(); } | |
301 | |
302 public: | |
13
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303 // Accessors |
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304 size_t min_gen1_size() { return _min_gen1_size; } |
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305 void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
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306 size_t initial_gen1_size() { return _initial_gen1_size; } |
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307 void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
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308 size_t max_gen1_size() { return _max_gen1_size; } |
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309 void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
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310 |
0 | 311 // Inherited methods |
312 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
313 | |
314 int number_of_generations() { return 2; } | |
315 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } | |
316 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
317 | |
318 virtual CollectorPolicy::Name kind() { | |
319 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
320 } | |
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321 |
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322 // Returns true is gen0 sizes were adjusted |
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323 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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324 size_t heap_size, size_t min_gen1_size); |
0 | 325 }; |
326 | |
327 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
328 protected: | |
329 void initialize_generations(); | |
330 | |
331 public: | |
332 MarkSweepPolicy(); | |
333 | |
334 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
335 | |
336 void initialize_gc_policy_counters(); | |
337 }; | |
1972 | 338 |
339 #endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |