Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.hpp @ 13059:46d7652b223c
8026853: Prepare GC code for collector policy regression fix
Summary: Cleanup related to the NewSize and MaxNewSize bugs
Reviewed-by: tschatzl, jcoomes, ehelin
author | jwilhelm |
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date | Mon, 21 Oct 2013 18:56:20 +0200 |
parents | 4288e54fd145 |
children | 8f07aa079343 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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" |
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32 #include "utilities/macros.hpp" |
1972 | 33 |
0 | 34 // This class (or more correctly, subtypes of this class) |
35 // are used to define global garbage collector attributes. | |
36 // This includes initialization of generations and any other | |
37 // shared resources they may need. | |
38 // | |
39 // In general, all flag adjustment and validation should be | |
40 // done in initialize_flags(), which is called prior to | |
41 // initialize_size_info(). | |
42 // | |
43 // This class is not fully developed yet. As more collector(s) | |
44 // are added, it is expected that we will come across further | |
45 // behavior that requires global attention. The correct place | |
46 // to deal with those issues is this class. | |
47 | |
48 // Forward declarations. | |
49 class GenCollectorPolicy; | |
50 class TwoGenerationCollectorPolicy; | |
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51 class AdaptiveSizePolicy; |
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52 #if INCLUDE_ALL_GCS |
0 | 53 class ConcurrentMarkSweepPolicy; |
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54 class G1CollectorPolicy; |
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55 #endif // INCLUDE_ALL_GCS |
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56 |
0 | 57 class GCPolicyCounters; |
58 class MarkSweepPolicy; | |
59 | |
6197 | 60 class CollectorPolicy : public CHeapObj<mtGC> { |
0 | 61 protected: |
62 GCPolicyCounters* _gc_policy_counters; | |
63 | |
64 // Requires that the concrete subclass sets the alignment constraints | |
65 // before calling. | |
66 virtual void initialize_flags(); | |
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67 virtual void initialize_size_info(); |
0 | 68 |
69 size_t _initial_heap_byte_size; | |
70 size_t _max_heap_byte_size; | |
71 size_t _min_heap_byte_size; | |
72 | |
73 size_t _min_alignment; | |
74 size_t _max_alignment; | |
75 | |
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76 // The sizing of the heap are controlled by a sizing policy. |
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77 AdaptiveSizePolicy* _size_policy; |
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78 |
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79 // Set to true when policy wants soft refs cleared. |
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80 // Reset to false by gc after it clears all soft refs. |
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81 bool _should_clear_all_soft_refs; |
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82 |
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83 // Set to true by the GC if the just-completed gc cleared all |
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84 // softrefs. This is set to true whenever a gc clears all softrefs, and |
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85 // set to false each time gc returns to the mutator. For example, in the |
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86 // ParallelScavengeHeap case the latter would be done toward the end of |
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87 // mem_allocate() where it returns op.result() |
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88 bool _all_soft_refs_clear; |
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89 |
0 | 90 CollectorPolicy() : |
91 _min_alignment(1), | |
92 _max_alignment(1), | |
93 _initial_heap_byte_size(0), | |
94 _max_heap_byte_size(0), | |
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95 _min_heap_byte_size(0), |
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96 _size_policy(NULL), |
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97 _should_clear_all_soft_refs(false), |
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98 _all_soft_refs_clear(false) |
0 | 99 {} |
100 | |
101 public: | |
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102 // Return maximum heap alignment that may be imposed by the policy |
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103 static size_t compute_max_alignment(); |
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104 |
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105 size_t min_alignment() { return _min_alignment; } |
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106 size_t max_alignment() { return _max_alignment; } |
0 | 107 |
108 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
109 size_t max_heap_byte_size() { return _max_heap_byte_size; } | |
110 size_t min_heap_byte_size() { return _min_heap_byte_size; } | |
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; } | |
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137 #if INCLUDE_ALL_GCS |
0 | 138 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } |
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139 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
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140 #endif // INCLUDE_ALL_GCS |
0 | 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; } | |
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145 #if INCLUDE_ALL_GCS |
0 | 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; } |
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148 #else // INCLUDE_ALL_GCS |
0 | 149 bool is_concurrent_mark_sweep_policy() { return false; } |
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150 bool is_g1_policy() { return false; } |
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151 #endif // INCLUDE_ALL_GCS |
0 | 152 |
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153 |
0 | 154 virtual BarrierSet::Name barrier_set_name() = 0; |
155 | |
156 // Create the remembered set (to cover the given reserved region, | |
157 // allowing breaking up into at most "max_covered_regions"). | |
158 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
159 int max_covered_regions); | |
160 | |
161 // This method controls how a collector satisfies a request | |
162 // for a block of memory. "gc_time_limit_was_exceeded" will | |
163 // be set to true if the adaptive size policy determine that | |
164 // an excessive amount of time is being spent doing collections | |
165 // and caused a NULL to be returned. If a NULL is not returned, | |
166 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
167 virtual HeapWord* mem_allocate_work(size_t size, | |
168 bool is_tlab, | |
169 bool* gc_overhead_limit_was_exceeded) = 0; | |
170 | |
171 // This method controls how a collector handles one or more | |
172 // of its generations being fully allocated. | |
173 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
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174 // This method controls how a collector handles a metadata allocation |
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175 // failure. |
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176 virtual MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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177 size_t size, |
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178 Metaspace::MetadataType mdtype); |
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179 |
0 | 180 // Performace Counter support |
181 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
182 | |
183 // Create the jstat counters for the GC policy. By default, policy's | |
184 // don't have associated counters, and we complain if this is invoked. | |
185 virtual void initialize_gc_policy_counters() { | |
186 ShouldNotReachHere(); | |
187 } | |
188 | |
189 virtual CollectorPolicy::Name kind() { | |
190 return CollectorPolicy::CollectorPolicyKind; | |
191 } | |
192 | |
193 // Returns true if a collector has eden space with soft end. | |
194 virtual bool has_soft_ended_eden() { | |
195 return false; | |
196 } | |
197 | |
198 }; | |
199 | |
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200 class ClearedAllSoftRefs : public StackObj { |
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201 bool _clear_all_soft_refs; |
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202 CollectorPolicy* _collector_policy; |
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203 public: |
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204 ClearedAllSoftRefs(bool clear_all_soft_refs, |
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205 CollectorPolicy* collector_policy) : |
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206 _clear_all_soft_refs(clear_all_soft_refs), |
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207 _collector_policy(collector_policy) {} |
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208 |
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209 ~ClearedAllSoftRefs() { |
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210 if (_clear_all_soft_refs) { |
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211 _collector_policy->cleared_all_soft_refs(); |
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212 } |
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213 } |
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214 }; |
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215 |
0 | 216 class GenCollectorPolicy : public CollectorPolicy { |
217 protected: | |
218 size_t _min_gen0_size; | |
219 size_t _initial_gen0_size; | |
220 size_t _max_gen0_size; | |
221 | |
222 GenerationSpec **_generations; | |
223 | |
224 // Return true if an allocation should be attempted in the older | |
225 // generation if it fails in the younger generation. Return | |
226 // false, otherwise. | |
227 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
228 | |
229 void initialize_flags(); | |
230 void initialize_size_info(); | |
231 | |
232 // Try to allocate space by expanding the heap. | |
233 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
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 size_t initial_gen0_size() { return _initial_gen0_size; } |
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248 size_t max_gen0_size() { return _max_gen0_size; } |
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249 |
0 | 250 virtual int number_of_generations() = 0; |
251 | |
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252 virtual GenerationSpec **generations() { |
0 | 253 assert(_generations != NULL, "Sanity check"); |
254 return _generations; | |
255 } | |
256 | |
257 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
258 | |
259 virtual void initialize_generations() = 0; | |
260 | |
261 virtual void initialize_all() { | |
262 initialize_flags(); | |
263 initialize_size_info(); | |
264 initialize_generations(); | |
265 } | |
266 | |
267 HeapWord* mem_allocate_work(size_t size, | |
268 bool is_tlab, | |
269 bool* gc_overhead_limit_was_exceeded); | |
270 | |
271 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
272 | |
273 // Adaptive size policy | |
274 virtual void initialize_size_policy(size_t init_eden_size, | |
275 size_t init_promo_size, | |
276 size_t init_survivor_size); | |
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277 |
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278 // The alignment used for eden and survivors within the young gen |
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279 // and for boundary between young gen and old gen. |
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280 static size_t intra_heap_alignment() { |
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281 return 64 * K * HeapWordSize; |
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282 } |
0 | 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 size_t initial_gen1_size() { return _initial_gen1_size; } |
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305 size_t max_gen1_size() { return _max_gen1_size; } |
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306 |
0 | 307 // Inherited methods |
308 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
309 | |
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310 int number_of_generations() { return 2; } |
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311 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } |
0 | 312 |
313 virtual CollectorPolicy::Name kind() { | |
314 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
315 } | |
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316 |
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317 // Returns true is gen0 sizes were adjusted |
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318 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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319 const size_t heap_size, const size_t min_gen1_size); |
0 | 320 }; |
321 | |
322 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
323 protected: | |
324 void initialize_generations(); | |
325 | |
326 public: | |
327 MarkSweepPolicy(); | |
328 | |
329 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
330 | |
331 void initialize_gc_policy_counters(); | |
332 }; | |
1972 | 333 |
334 #endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |