Mercurial > hg > graal-compiler
annotate src/share/vm/memory/collectorPolicy.hpp @ 367:194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
Reviewed-by: rasbold, jrose
author | never |
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date | Wed, 17 Sep 2008 12:59:52 -0700 |
parents | d1605aabd0a1 |
children | 1ee8caae33af |
rev | line source |
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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; | |
42 #ifndef SERIALGC | |
43 class ConcurrentMarkSweepPolicy; | |
44 #endif // SERIALGC | |
45 class AdaptiveSizePolicy; | |
46 class GCPolicyCounters; | |
47 class PermanentGenerationSpec; | |
48 class MarkSweepPolicy; | |
49 | |
50 class CollectorPolicy : public CHeapObj { | |
51 protected: | |
52 PermanentGenerationSpec *_permanent_generation; | |
53 GCPolicyCounters* _gc_policy_counters; | |
54 | |
55 // Requires that the concrete subclass sets the alignment constraints | |
56 // before calling. | |
57 virtual void initialize_flags(); | |
58 virtual void initialize_size_info() = 0; | |
59 // Initialize "_permanent_generation" to a spec for the given kind of | |
60 // Perm Gen. | |
61 void initialize_perm_generation(PermGen::Name pgnm); | |
62 | |
63 size_t _initial_heap_byte_size; | |
64 size_t _max_heap_byte_size; | |
65 size_t _min_heap_byte_size; | |
66 | |
67 size_t _min_alignment; | |
68 size_t _max_alignment; | |
69 | |
70 CollectorPolicy() : | |
71 _min_alignment(1), | |
72 _max_alignment(1), | |
73 _initial_heap_byte_size(0), | |
74 _max_heap_byte_size(0), | |
75 _min_heap_byte_size(0) | |
76 {} | |
77 | |
78 public: | |
79 void set_min_alignment(size_t align) { _min_alignment = align; } | |
80 size_t min_alignment() { return _min_alignment; } | |
81 void set_max_alignment(size_t align) { _max_alignment = align; } | |
82 size_t max_alignment() { return _max_alignment; } | |
83 | |
84 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
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85 void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
0 | 86 size_t max_heap_byte_size() { return _max_heap_byte_size; } |
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87 void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
0 | 88 size_t min_heap_byte_size() { return _min_heap_byte_size; } |
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89 void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
0 | 90 |
91 enum Name { | |
92 CollectorPolicyKind, | |
93 TwoGenerationCollectorPolicyKind, | |
94 TrainPolicyKind, | |
95 ConcurrentMarkSweepPolicyKind, | |
96 ASConcurrentMarkSweepPolicyKind | |
97 }; | |
98 | |
99 // Identification methods. | |
100 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } | |
101 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } | |
102 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
103 #ifndef SERIALGC | |
104 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } | |
105 #endif // SERIALGC | |
106 // Note that these are not virtual. | |
107 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
108 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
109 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
110 #ifndef SERIALGC | |
111 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } | |
112 #else // SERIALGC | |
113 bool is_concurrent_mark_sweep_policy() { return false; } | |
114 #endif // SERIALGC | |
115 | |
116 virtual PermanentGenerationSpec *permanent_generation() { | |
117 assert(_permanent_generation != NULL, "Sanity check"); | |
118 return _permanent_generation; | |
119 } | |
120 | |
121 virtual BarrierSet::Name barrier_set_name() = 0; | |
122 virtual GenRemSet::Name rem_set_name() = 0; | |
123 | |
124 // Create the remembered set (to cover the given reserved region, | |
125 // allowing breaking up into at most "max_covered_regions"). | |
126 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
127 int max_covered_regions); | |
128 | |
129 // This method controls how a collector satisfies a request | |
130 // for a block of memory. "gc_time_limit_was_exceeded" will | |
131 // be set to true if the adaptive size policy determine that | |
132 // an excessive amount of time is being spent doing collections | |
133 // and caused a NULL to be returned. If a NULL is not returned, | |
134 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
135 virtual HeapWord* mem_allocate_work(size_t size, | |
136 bool is_tlab, | |
137 bool* gc_overhead_limit_was_exceeded) = 0; | |
138 | |
139 // This method controls how a collector handles one or more | |
140 // of its generations being fully allocated. | |
141 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
142 // Performace Counter support | |
143 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
144 | |
145 // Create the jstat counters for the GC policy. By default, policy's | |
146 // don't have associated counters, and we complain if this is invoked. | |
147 virtual void initialize_gc_policy_counters() { | |
148 ShouldNotReachHere(); | |
149 } | |
150 | |
151 virtual CollectorPolicy::Name kind() { | |
152 return CollectorPolicy::CollectorPolicyKind; | |
153 } | |
154 | |
155 // Returns true if a collector has eden space with soft end. | |
156 virtual bool has_soft_ended_eden() { | |
157 return false; | |
158 } | |
159 | |
160 }; | |
161 | |
162 class GenCollectorPolicy : public CollectorPolicy { | |
163 protected: | |
164 size_t _min_gen0_size; | |
165 size_t _initial_gen0_size; | |
166 size_t _max_gen0_size; | |
167 | |
168 GenerationSpec **_generations; | |
169 | |
170 // The sizing of the different generations in the heap are controlled | |
171 // by a sizing policy. | |
172 AdaptiveSizePolicy* _size_policy; | |
173 | |
174 // Return true if an allocation should be attempted in the older | |
175 // generation if it fails in the younger generation. Return | |
176 // false, otherwise. | |
177 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
178 | |
179 void initialize_flags(); | |
180 void initialize_size_info(); | |
181 | |
182 // Try to allocate space by expanding the heap. | |
183 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
184 | |
185 // compute max heap alignment | |
186 size_t compute_max_alignment(); | |
187 | |
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188 // Scale the base_size by NewRation according to |
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189 // result = base_size / (NewRatio + 1) |
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190 // and align by min_alignment() |
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191 size_t scale_by_NewRatio_aligned(size_t base_size); |
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192 |
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193 // Bound the value by the given maximum minus the |
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194 // min_alignment. |
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195 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 196 |
197 public: | |
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198 // Accessors |
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199 size_t min_gen0_size() { return _min_gen0_size; } |
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200 void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
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201 size_t initial_gen0_size() { return _initial_gen0_size; } |
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202 void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
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203 size_t max_gen0_size() { return _max_gen0_size; } |
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204 void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
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205 |
0 | 206 virtual int number_of_generations() = 0; |
207 | |
208 virtual GenerationSpec **generations() { | |
209 assert(_generations != NULL, "Sanity check"); | |
210 return _generations; | |
211 } | |
212 | |
213 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
214 | |
215 virtual void initialize_generations() = 0; | |
216 | |
217 virtual void initialize_all() { | |
218 initialize_flags(); | |
219 initialize_size_info(); | |
220 initialize_generations(); | |
221 } | |
222 | |
223 HeapWord* mem_allocate_work(size_t size, | |
224 bool is_tlab, | |
225 bool* gc_overhead_limit_was_exceeded); | |
226 | |
227 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
228 | |
229 // The size that defines a "large array". | |
230 virtual size_t large_typearray_limit(); | |
231 | |
232 // Adaptive size policy | |
233 AdaptiveSizePolicy* size_policy() { return _size_policy; } | |
234 virtual void initialize_size_policy(size_t init_eden_size, | |
235 size_t init_promo_size, | |
236 size_t init_survivor_size); | |
237 | |
238 }; | |
239 | |
240 | |
241 // All of hotspot's current collectors are subtypes of this | |
242 // class. Currently, these collectors all use the same gen[0], | |
243 // but have different gen[1] types. If we add another subtype | |
244 // of CollectorPolicy, this class should be broken out into | |
245 // its own file. | |
246 | |
247 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
248 protected: | |
249 size_t _min_gen1_size; | |
250 size_t _initial_gen1_size; | |
251 size_t _max_gen1_size; | |
252 | |
253 void initialize_flags(); | |
254 void initialize_size_info(); | |
255 void initialize_generations() { ShouldNotReachHere(); } | |
256 | |
257 public: | |
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258 // Accessors |
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259 size_t min_gen1_size() { return _min_gen1_size; } |
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260 void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
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261 size_t initial_gen1_size() { return _initial_gen1_size; } |
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262 void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
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263 size_t max_gen1_size() { return _max_gen1_size; } |
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264 void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
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265 |
0 | 266 // Inherited methods |
267 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
268 | |
269 int number_of_generations() { return 2; } | |
270 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } | |
271 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
272 | |
273 virtual CollectorPolicy::Name kind() { | |
274 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
275 } | |
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276 |
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277 // Returns true is gen0 sizes were adjusted |
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278 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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279 size_t heap_size, size_t min_gen1_size); |
0 | 280 }; |
281 | |
282 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
283 protected: | |
284 void initialize_generations(); | |
285 | |
286 public: | |
287 MarkSweepPolicy(); | |
288 | |
289 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
290 | |
291 void initialize_gc_policy_counters(); | |
292 }; |