Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.hpp @ 17721:d8a0bb6f62a5
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author | coffeys |
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date | Wed, 12 Mar 2014 18:53:34 +0000 |
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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 | |
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64 virtual void initialize_alignments() = 0; |
0 | 65 virtual void initialize_flags(); |
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66 virtual void initialize_size_info(); |
0 | 67 |
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68 DEBUG_ONLY(virtual void assert_flags();) |
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69 DEBUG_ONLY(virtual void assert_size_info();) |
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70 |
0 | 71 size_t _initial_heap_byte_size; |
72 size_t _max_heap_byte_size; | |
73 size_t _min_heap_byte_size; | |
74 | |
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75 size_t _space_alignment; |
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76 size_t _heap_alignment; |
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77 |
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78 // Needed to keep information if MaxHeapSize was set on the command line |
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79 // when the flag value is aligned etc by ergonomics |
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80 bool _max_heap_size_cmdline; |
0 | 81 |
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82 // The sizing of the heap are controlled by a sizing policy. |
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83 AdaptiveSizePolicy* _size_policy; |
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84 |
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85 // Set to true when policy wants soft refs cleared. |
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86 // Reset to false by gc after it clears all soft refs. |
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87 bool _should_clear_all_soft_refs; |
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88 |
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89 // Set to true by the GC if the just-completed gc cleared all |
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90 // softrefs. This is set to true whenever a gc clears all softrefs, and |
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91 // set to false each time gc returns to the mutator. For example, in the |
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92 // ParallelScavengeHeap case the latter would be done toward the end of |
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93 // mem_allocate() where it returns op.result() |
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94 bool _all_soft_refs_clear; |
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95 |
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96 CollectorPolicy(); |
0 | 97 |
98 public: | |
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99 virtual void initialize_all() { |
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100 initialize_alignments(); |
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101 initialize_flags(); |
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102 initialize_size_info(); |
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103 } |
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104 |
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105 // Return maximum heap alignment that may be imposed by the policy |
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106 static size_t compute_heap_alignment(); |
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107 |
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108 size_t space_alignment() { return _space_alignment; } |
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109 size_t heap_alignment() { return _heap_alignment; } |
0 | 110 |
111 size_t initial_heap_byte_size() { return _initial_heap_byte_size; } | |
112 size_t max_heap_byte_size() { return _max_heap_byte_size; } | |
113 size_t min_heap_byte_size() { return _min_heap_byte_size; } | |
114 | |
115 enum Name { | |
116 CollectorPolicyKind, | |
117 TwoGenerationCollectorPolicyKind, | |
118 ConcurrentMarkSweepPolicyKind, | |
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119 ASConcurrentMarkSweepPolicyKind, |
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120 G1CollectorPolicyKind |
0 | 121 }; |
122 | |
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123 AdaptiveSizePolicy* size_policy() { return _size_policy; } |
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124 bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; } |
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125 void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; } |
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126 // Returns the current value of _should_clear_all_soft_refs. |
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127 // _should_clear_all_soft_refs is set to false as a side effect. |
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128 bool use_should_clear_all_soft_refs(bool v); |
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129 bool all_soft_refs_clear() { return _all_soft_refs_clear; } |
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130 void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; } |
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131 |
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132 // Called by the GC after Soft Refs have been cleared to indicate |
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133 // that the request in _should_clear_all_soft_refs has been fulfilled. |
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134 void cleared_all_soft_refs(); |
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135 |
0 | 136 // Identification methods. |
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137 virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
0 | 138 virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
139 virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } | |
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140 #if INCLUDE_ALL_GCS |
0 | 141 virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } |
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142 virtual G1CollectorPolicy* as_g1_policy() { return NULL; } |
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143 #endif // INCLUDE_ALL_GCS |
0 | 144 // Note that these are not virtual. |
145 bool is_generation_policy() { return as_generation_policy() != NULL; } | |
146 bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } | |
147 bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } | |
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148 #if INCLUDE_ALL_GCS |
0 | 149 bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } |
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150 bool is_g1_policy() { return as_g1_policy() != NULL; } |
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151 #else // INCLUDE_ALL_GCS |
0 | 152 bool is_concurrent_mark_sweep_policy() { return false; } |
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153 bool is_g1_policy() { return false; } |
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154 #endif // INCLUDE_ALL_GCS |
0 | 155 |
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156 |
0 | 157 virtual BarrierSet::Name barrier_set_name() = 0; |
158 | |
159 // Create the remembered set (to cover the given reserved region, | |
160 // allowing breaking up into at most "max_covered_regions"). | |
161 virtual GenRemSet* create_rem_set(MemRegion reserved, | |
162 int max_covered_regions); | |
163 | |
164 // This method controls how a collector satisfies a request | |
165 // for a block of memory. "gc_time_limit_was_exceeded" will | |
166 // be set to true if the adaptive size policy determine that | |
167 // an excessive amount of time is being spent doing collections | |
168 // and caused a NULL to be returned. If a NULL is not returned, | |
169 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
170 virtual HeapWord* mem_allocate_work(size_t size, | |
171 bool is_tlab, | |
172 bool* gc_overhead_limit_was_exceeded) = 0; | |
173 | |
174 // This method controls how a collector handles one or more | |
175 // of its generations being fully allocated. | |
176 virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; | |
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177 // This method controls how a collector handles a metadata allocation |
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178 // failure. |
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179 virtual MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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180 size_t size, |
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181 Metaspace::MetadataType mdtype); |
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182 |
0 | 183 // Performace Counter support |
184 GCPolicyCounters* counters() { return _gc_policy_counters; } | |
185 | |
186 // Create the jstat counters for the GC policy. By default, policy's | |
187 // don't have associated counters, and we complain if this is invoked. | |
188 virtual void initialize_gc_policy_counters() { | |
189 ShouldNotReachHere(); | |
190 } | |
191 | |
192 virtual CollectorPolicy::Name kind() { | |
193 return CollectorPolicy::CollectorPolicyKind; | |
194 } | |
195 | |
196 // Returns true if a collector has eden space with soft end. | |
197 virtual bool has_soft_ended_eden() { | |
198 return false; | |
199 } | |
200 | |
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201 // Do any updates required to global flags that are due to heap initialization |
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202 // changes |
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203 virtual void post_heap_initialize() = 0; |
0 | 204 }; |
205 | |
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206 class ClearedAllSoftRefs : public StackObj { |
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207 bool _clear_all_soft_refs; |
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208 CollectorPolicy* _collector_policy; |
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209 public: |
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210 ClearedAllSoftRefs(bool clear_all_soft_refs, |
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211 CollectorPolicy* collector_policy) : |
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212 _clear_all_soft_refs(clear_all_soft_refs), |
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213 _collector_policy(collector_policy) {} |
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214 |
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215 ~ClearedAllSoftRefs() { |
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216 if (_clear_all_soft_refs) { |
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217 _collector_policy->cleared_all_soft_refs(); |
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218 } |
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219 } |
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220 }; |
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221 |
0 | 222 class GenCollectorPolicy : public CollectorPolicy { |
223 protected: | |
224 size_t _min_gen0_size; | |
225 size_t _initial_gen0_size; | |
226 size_t _max_gen0_size; | |
227 | |
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228 // _gen_alignment and _space_alignment will have the same value most of the |
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229 // time. When using large pages they can differ. |
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230 size_t _gen_alignment; |
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231 |
0 | 232 GenerationSpec **_generations; |
233 | |
234 // Return true if an allocation should be attempted in the older | |
235 // generation if it fails in the younger generation. Return | |
236 // false, otherwise. | |
237 virtual bool should_try_older_generation_allocation(size_t word_size) const; | |
238 | |
239 void initialize_flags(); | |
240 void initialize_size_info(); | |
241 | |
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242 DEBUG_ONLY(void assert_flags();) |
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243 DEBUG_ONLY(void assert_size_info();) |
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244 |
0 | 245 // Try to allocate space by expanding the heap. |
246 virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); | |
247 | |
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248 // Compute max heap alignment |
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249 size_t compute_max_alignment(); |
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250 |
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251 // Scale the base_size by NewRatio according to |
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252 // result = base_size / (NewRatio + 1) |
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253 // and align by min_alignment() |
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254 size_t scale_by_NewRatio_aligned(size_t base_size); |
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255 |
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256 // Bound the value by the given maximum minus the min_alignment |
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257 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
0 | 258 |
259 public: | |
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260 GenCollectorPolicy(); |
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261 |
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262 // Accessors |
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263 size_t min_gen0_size() { return _min_gen0_size; } |
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264 size_t initial_gen0_size() { return _initial_gen0_size; } |
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265 size_t max_gen0_size() { return _max_gen0_size; } |
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266 size_t gen_alignment() { return _gen_alignment; } |
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267 |
0 | 268 virtual int number_of_generations() = 0; |
269 | |
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270 virtual GenerationSpec **generations() { |
0 | 271 assert(_generations != NULL, "Sanity check"); |
272 return _generations; | |
273 } | |
274 | |
275 virtual GenCollectorPolicy* as_generation_policy() { return this; } | |
276 | |
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277 virtual void initialize_generations() { }; |
0 | 278 |
279 virtual void initialize_all() { | |
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280 CollectorPolicy::initialize_all(); |
0 | 281 initialize_generations(); |
282 } | |
283 | |
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284 size_t young_gen_size_lower_bound(); |
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285 |
0 | 286 HeapWord* mem_allocate_work(size_t size, |
287 bool is_tlab, | |
288 bool* gc_overhead_limit_was_exceeded); | |
289 | |
290 HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); | |
291 | |
292 // Adaptive size policy | |
293 virtual void initialize_size_policy(size_t init_eden_size, | |
294 size_t init_promo_size, | |
295 size_t init_survivor_size); | |
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296 |
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297 virtual void post_heap_initialize() { |
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298 assert(_max_gen0_size == MaxNewSize, "Should be taken care of by initialize_size_info"); |
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299 } |
0 | 300 }; |
301 | |
302 // All of hotspot's current collectors are subtypes of this | |
303 // class. Currently, these collectors all use the same gen[0], | |
304 // but have different gen[1] types. If we add another subtype | |
305 // of CollectorPolicy, this class should be broken out into | |
306 // its own file. | |
307 | |
308 class TwoGenerationCollectorPolicy : public GenCollectorPolicy { | |
309 protected: | |
310 size_t _min_gen1_size; | |
311 size_t _initial_gen1_size; | |
312 size_t _max_gen1_size; | |
313 | |
314 void initialize_flags(); | |
315 void initialize_size_info(); | |
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316 |
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317 DEBUG_ONLY(void assert_flags();) |
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318 DEBUG_ONLY(void assert_size_info();) |
0 | 319 |
320 public: | |
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321 TwoGenerationCollectorPolicy() : GenCollectorPolicy(), _min_gen1_size(0), |
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322 _initial_gen1_size(0), _max_gen1_size(0) {} |
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323 |
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324 // Accessors |
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325 size_t min_gen1_size() { return _min_gen1_size; } |
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326 size_t initial_gen1_size() { return _initial_gen1_size; } |
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327 size_t max_gen1_size() { return _max_gen1_size; } |
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328 |
0 | 329 // Inherited methods |
330 TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } | |
331 | |
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332 int number_of_generations() { return 2; } |
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333 BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } |
0 | 334 |
335 virtual CollectorPolicy::Name kind() { | |
336 return CollectorPolicy::TwoGenerationCollectorPolicyKind; | |
337 } | |
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338 |
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339 // Returns true if gen0 sizes were adjusted |
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340 bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
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341 const size_t heap_size); |
0 | 342 }; |
343 | |
344 class MarkSweepPolicy : public TwoGenerationCollectorPolicy { | |
345 protected: | |
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346 void initialize_alignments(); |
0 | 347 void initialize_generations(); |
348 | |
349 public: | |
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350 MarkSweepPolicy() {} |
0 | 351 |
352 MarkSweepPolicy* as_mark_sweep_policy() { return this; } | |
353 | |
354 void initialize_gc_policy_counters(); | |
355 }; | |
1972 | 356 |
357 #endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |