1 /* |
1 /* |
2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
2 * Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
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 |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
67 size_t _min_heap_byte_size; |
67 size_t _min_heap_byte_size; |
68 |
68 |
69 size_t _min_alignment; |
69 size_t _min_alignment; |
70 size_t _max_alignment; |
70 size_t _max_alignment; |
71 |
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 |
72 CollectorPolicy() : |
85 CollectorPolicy() : |
73 _min_alignment(1), |
86 _min_alignment(1), |
74 _max_alignment(1), |
87 _max_alignment(1), |
75 _initial_heap_byte_size(0), |
88 _initial_heap_byte_size(0), |
76 _max_heap_byte_size(0), |
89 _max_heap_byte_size(0), |
77 _min_heap_byte_size(0) |
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) |
78 {} |
94 {} |
79 |
95 |
80 public: |
96 public: |
81 void set_min_alignment(size_t align) { _min_alignment = align; } |
97 void set_min_alignment(size_t align) { _min_alignment = align; } |
82 size_t min_alignment() { return _min_alignment; } |
98 size_t min_alignment() { return _min_alignment; } |
95 TwoGenerationCollectorPolicyKind, |
111 TwoGenerationCollectorPolicyKind, |
96 ConcurrentMarkSweepPolicyKind, |
112 ConcurrentMarkSweepPolicyKind, |
97 ASConcurrentMarkSweepPolicyKind, |
113 ASConcurrentMarkSweepPolicyKind, |
98 G1CollectorPolicyKind |
114 G1CollectorPolicyKind |
99 }; |
115 }; |
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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(); |
100 |
129 |
101 // Identification methods. |
130 // Identification methods. |
102 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
131 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
103 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
132 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
104 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } |
133 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } |
163 return false; |
192 return false; |
164 } |
193 } |
165 |
194 |
166 }; |
195 }; |
167 |
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 |
168 class GenCollectorPolicy : public CollectorPolicy { |
213 class GenCollectorPolicy : public CollectorPolicy { |
169 protected: |
214 protected: |
170 size_t _min_gen0_size; |
215 size_t _min_gen0_size; |
171 size_t _initial_gen0_size; |
216 size_t _initial_gen0_size; |
172 size_t _max_gen0_size; |
217 size_t _max_gen0_size; |
173 |
218 |
174 GenerationSpec **_generations; |
219 GenerationSpec **_generations; |
175 |
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176 // The sizing of the different generations in the heap are controlled |
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177 // by a sizing policy. |
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178 AdaptiveSizePolicy* _size_policy; |
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179 |
220 |
180 // Return true if an allocation should be attempted in the older |
221 // Return true if an allocation should be attempted in the older |
181 // generation if it fails in the younger generation. Return |
222 // generation if it fails in the younger generation. Return |
182 // false, otherwise. |
223 // false, otherwise. |
183 virtual bool should_try_older_generation_allocation(size_t word_size) const; |
224 virtual bool should_try_older_generation_allocation(size_t word_size) const; |
234 |
275 |
235 // The size that defines a "large array". |
276 // The size that defines a "large array". |
236 virtual size_t large_typearray_limit(); |
277 virtual size_t large_typearray_limit(); |
237 |
278 |
238 // Adaptive size policy |
279 // Adaptive size policy |
239 AdaptiveSizePolicy* size_policy() { return _size_policy; } |
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240 virtual void initialize_size_policy(size_t init_eden_size, |
280 virtual void initialize_size_policy(size_t init_eden_size, |
241 size_t init_promo_size, |
281 size_t init_promo_size, |
242 size_t init_survivor_size); |
282 size_t init_survivor_size); |
243 |
283 }; |
244 }; |
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245 |
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246 |
284 |
247 // All of hotspot's current collectors are subtypes of this |
285 // All of hotspot's current collectors are subtypes of this |
248 // class. Currently, these collectors all use the same gen[0], |
286 // class. Currently, these collectors all use the same gen[0], |
249 // but have different gen[1] types. If we add another subtype |
287 // but have different gen[1] types. If we add another subtype |
250 // of CollectorPolicy, this class should be broken out into |
288 // of CollectorPolicy, this class should be broken out into |