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annotate src/share/vm/memory/collectorPolicy.hpp @ 832:e7d5557ad624
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date | Thu, 02 Jul 2009 16:28:15 -0700 |
parents | 1ee8caae33af |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
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 // 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 | |
72 CollectorPolicy() : | |
73 _min_alignment(1), | |
74 _max_alignment(1), | |
75 _initial_heap_byte_size(0), | |
76 _max_heap_byte_size(0), | |
77 _min_heap_byte_size(0) | |
78 {} | |
79 | |
80 public: | |
81 void set_min_alignment(size_t align) { _min_alignment = align; } | |
82 size_t min_alignment() { return _min_alignment; } | |
83 void set_max_alignment(size_t align) { _max_alignment = align; } | |
84 size_t max_alignment() { return _max_alignment; } | |
85 | |
86 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
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87 void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
0 | 88 size_t max_heap_byte_size() { return _max_heap_byte_size; } |
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89 void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
0 | 90 size_t min_heap_byte_size() { return _min_heap_byte_size; } |
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91 void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
0 | 92 |
93 enum Name { | |
94 CollectorPolicyKind, | |
95 TwoGenerationCollectorPolicyKind, | |
96 ConcurrentMarkSweepPolicyKind, | |
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97 ASConcurrentMarkSweepPolicyKind, |
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98 G1CollectorPolicyKind |
0 | 99 }; |
100 | |
101 // Identification methods. | |
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102 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
0 | 103 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
104 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
105 #ifndef SERIALGC | |
106 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } | |
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107 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
0 | 108 #endif // SERIALGC |
109 // Note that these are not virtual. | |
110 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
111 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
112 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
113 #ifndef SERIALGC | |
114 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } | |
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115 bool is_g1_policy() { return as_g1_policy() != NULL; } |
0 | 116 #else // SERIALGC |
117 bool is_concurrent_mark_sweep_policy() { return false; } | |
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118 bool is_g1_policy() { return false; } |
0 | 119 #endif // SERIALGC |
120 | |
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121 |
0 | 122 virtual PermanentGenerationSpec *permanent_generation() { |
123 assert(_permanent_generation != NULL, "Sanity check"); | |
124 return _permanent_generation; | |
125 } | |
126 | |
127 virtual BarrierSet::Name barrier_set_name() = 0; | |
128 virtual GenRemSet::Name rem_set_name() = 0; | |
129 | |
130 // Create the remembered set (to cover the given reserved region, | |
131 // allowing breaking up into at most "max_covered_regions"). | |
132 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
133 int max_covered_regions); | |
134 | |
135 // This method controls how a collector satisfies a request | |
136 // for a block of memory. "gc_time_limit_was_exceeded" will | |
137 // be set to true if the adaptive size policy determine that | |
138 // an excessive amount of time is being spent doing collections | |
139 // and caused a NULL to be returned. If a NULL is not returned, | |
140 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
141 virtual HeapWord* mem_allocate_work(size_t size, | |
142 bool is_tlab, | |
143 bool* gc_overhead_limit_was_exceeded) = 0; | |
144 | |
145 // This method controls how a collector handles one or more | |
146 // of its generations being fully allocated. | |
147 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
148 // Performace Counter support | |
149 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
150 | |
151 // Create the jstat counters for the GC policy. By default, policy's | |
152 // don't have associated counters, and we complain if this is invoked. | |
153 virtual void initialize_gc_policy_counters() { | |
154 ShouldNotReachHere(); | |
155 } | |
156 | |
157 virtual CollectorPolicy::Name kind() { | |
158 return CollectorPolicy::CollectorPolicyKind; | |
159 } | |
160 | |
161 // Returns true if a collector has eden space with soft end. | |
162 virtual bool has_soft_ended_eden() { | |
163 return false; | |
164 } | |
165 | |
166 }; | |
167 | |
168 class GenCollectorPolicy : public CollectorPolicy { | |
169 protected: | |
170 size_t _min_gen0_size; | |
171 size_t _initial_gen0_size; | |
172 size_t _max_gen0_size; | |
173 | |
174 GenerationSpec **_generations; | |
175 | |
176 // The sizing of the different generations in the heap are controlled | |
177 // by a sizing policy. | |
178 AdaptiveSizePolicy* _size_policy; | |
179 | |
180 // Return true if an allocation should be attempted in the older | |
181 // generation if it fails in the younger generation. Return | |
182 // false, otherwise. | |
183 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
184 | |
185 void initialize_flags(); | |
186 void initialize_size_info(); | |
187 | |
188 // Try to allocate space by expanding the heap. | |
189 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
190 | |
191 // compute max heap alignment | |
192 size_t compute_max_alignment(); | |
193 | |
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194 // Scale the base_size by NewRation according to |
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195 // result = base_size / (NewRatio + 1) |
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196 // and align by min_alignment() |
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197 size_t scale_by_NewRatio_aligned(size_t base_size); |
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198 |
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199 // Bound the value by the given maximum minus the |
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200 // min_alignment. |
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201 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 202 |
203 public: | |
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204 // Accessors |
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205 size_t min_gen0_size() { return _min_gen0_size; } |
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206 void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
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207 size_t initial_gen0_size() { return _initial_gen0_size; } |
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208 void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
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209 size_t max_gen0_size() { return _max_gen0_size; } |
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210 void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
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211 |
0 | 212 virtual int number_of_generations() = 0; |
213 | |
214 virtual GenerationSpec **generations() { | |
215 assert(_generations != NULL, "Sanity check"); | |
216 return _generations; | |
217 } | |
218 | |
219 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
220 | |
221 virtual void initialize_generations() = 0; | |
222 | |
223 virtual void initialize_all() { | |
224 initialize_flags(); | |
225 initialize_size_info(); | |
226 initialize_generations(); | |
227 } | |
228 | |
229 HeapWord* mem_allocate_work(size_t size, | |
230 bool is_tlab, | |
231 bool* gc_overhead_limit_was_exceeded); | |
232 | |
233 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
234 | |
235 // The size that defines a "large array". | |
236 virtual size_t large_typearray_limit(); | |
237 | |
238 // Adaptive size policy | |
239 AdaptiveSizePolicy* size_policy() { return _size_policy; } | |
240 virtual void initialize_size_policy(size_t init_eden_size, | |
241 size_t init_promo_size, | |
242 size_t init_survivor_size); | |
243 | |
244 }; | |
245 | |
246 | |
247 // All of hotspot's current collectors are subtypes of this | |
248 // class. Currently, these collectors all use the same gen[0], | |
249 // but have different gen[1] types. If we add another subtype | |
250 // of CollectorPolicy, this class should be broken out into | |
251 // its own file. | |
252 | |
253 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
254 protected: | |
255 size_t _min_gen1_size; | |
256 size_t _initial_gen1_size; | |
257 size_t _max_gen1_size; | |
258 | |
259 void initialize_flags(); | |
260 void initialize_size_info(); | |
261 void initialize_generations() { ShouldNotReachHere(); } | |
262 | |
263 public: | |
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264 // Accessors |
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265 size_t min_gen1_size() { return _min_gen1_size; } |
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266 void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
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267 size_t initial_gen1_size() { return _initial_gen1_size; } |
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268 void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
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269 size_t max_gen1_size() { return _max_gen1_size; } |
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270 void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
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271 |
0 | 272 // Inherited methods |
273 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
274 | |
275 int number_of_generations() { return 2; } | |
276 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } | |
277 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
278 | |
279 virtual CollectorPolicy::Name kind() { | |
280 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
281 } | |
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282 |
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283 // Returns true is gen0 sizes were adjusted |
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284 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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285 size_t heap_size, size_t min_gen1_size); |
0 | 286 }; |
287 | |
288 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
289 protected: | |
290 void initialize_generations(); | |
291 | |
292 public: | |
293 MarkSweepPolicy(); | |
294 | |
295 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
296 | |
297 void initialize_gc_policy_counters(); | |
298 }; |