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annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp @ 14213:6c4c27c5cc9a
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Reviewed-by: kvn
author | twisti |
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date | Fri, 06 Dec 2013 16:43:56 -0800 |
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0 | 1 /* |
10405 | 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP | |
27 | |
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28 #include "gc_implementation/parallelScavenge/generationSizer.hpp" |
1972 | 29 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" |
30 #include "gc_implementation/parallelScavenge/psGCAdaptivePolicyCounters.hpp" | |
31 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
32 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
10405 | 34 #include "gc_implementation/shared/gcWhen.hpp" |
1972 | 35 #include "gc_interface/collectedHeap.inline.hpp" |
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36 #include "memory/collectorPolicy.hpp" |
1972 | 37 #include "utilities/ostream.hpp" |
38 | |
0 | 39 class AdjoiningGenerations; |
10405 | 40 class GCHeapSummary; |
0 | 41 class GCTaskManager; |
10405 | 42 class PSAdaptiveSizePolicy; |
43 class PSHeapSummary; | |
0 | 44 |
45 class ParallelScavengeHeap : public CollectedHeap { | |
46 friend class VMStructs; | |
47 private: | |
48 static PSYoungGen* _young_gen; | |
49 static PSOldGen* _old_gen; | |
50 | |
51 // Sizing policy for entire heap | |
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52 static PSAdaptiveSizePolicy* _size_policy; |
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53 static PSGCAdaptivePolicyCounters* _gc_policy_counters; |
0 | 54 |
55 static ParallelScavengeHeap* _psh; | |
56 | |
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57 GenerationSizer* _collector_policy; |
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58 |
0 | 59 // Collection of generations that are adjacent in the |
60 // space reserved for the heap. | |
61 AdjoiningGenerations* _gens; | |
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62 unsigned int _death_march_count; |
0 | 63 |
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64 // The task manager |
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65 static GCTaskManager* _gc_task_manager; |
0 | 66 |
10405 | 67 void trace_heap(GCWhen::Type when, GCTracer* tracer); |
68 | |
0 | 69 protected: |
70 static inline size_t total_invocations(); | |
71 HeapWord* allocate_new_tlab(size_t size); | |
72 | |
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73 inline bool should_alloc_in_eden(size_t size) const; |
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74 inline void death_march_check(HeapWord* const result, size_t size); |
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75 HeapWord* mem_allocate_old_gen(size_t size); |
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76 |
0 | 77 public: |
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78 ParallelScavengeHeap() : CollectedHeap(), _death_march_count(0) { } |
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79 |
0 | 80 // For use by VM operations |
81 enum CollectionType { | |
82 Scavenge, | |
83 MarkSweep | |
84 }; | |
85 | |
86 ParallelScavengeHeap::Name kind() const { | |
87 return CollectedHeap::ParallelScavengeHeap; | |
88 } | |
89 | |
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90 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) _collector_policy; } |
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91 |
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92 static PSYoungGen* young_gen() { return _young_gen; } |
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93 static PSOldGen* old_gen() { return _old_gen; } |
0 | 94 |
95 virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; } | |
96 | |
97 static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; } | |
98 | |
99 static ParallelScavengeHeap* heap(); | |
100 | |
101 static GCTaskManager* const gc_task_manager() { return _gc_task_manager; } | |
102 | |
103 AdjoiningGenerations* gens() { return _gens; } | |
104 | |
105 // Returns JNI_OK on success | |
106 virtual jint initialize(); | |
107 | |
108 void post_initialize(); | |
109 void update_counters(); | |
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110 |
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111 // The alignment used for the various areas |
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112 size_t space_alignment() { return _collector_policy->space_alignment(); } |
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113 size_t generation_alignment() { return _collector_policy->gen_alignment(); } |
0 | 114 |
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115 // Return the (conservative) maximum heap alignment |
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116 static size_t conservative_max_heap_alignment() { |
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117 return CollectorPolicy::compute_heap_alignment(); |
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118 } |
0 | 119 |
120 size_t capacity() const; | |
121 size_t used() const; | |
122 | |
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123 // Return "true" if all generations have reached the |
0 | 124 // maximal committed limit that they can reach, without a garbage |
125 // collection. | |
126 virtual bool is_maximal_no_gc() const; | |
127 | |
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128 // Return true if the reference points to an object that |
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129 // can be moved in a partial collection. For currently implemented |
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130 // generational collectors that means during a collection of |
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131 // the young gen. |
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132 virtual bool is_scavengable(const void* addr); |
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133 |
0 | 134 // Does this heap support heap inspection? (+PrintClassHistogram) |
135 bool supports_heap_inspection() const { return true; } | |
136 | |
137 size_t max_capacity() const; | |
138 | |
139 // Whether p is in the allocated part of the heap | |
140 bool is_in(const void* p) const; | |
141 | |
142 bool is_in_reserved(const void* p) const; | |
143 | |
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144 #ifdef ASSERT |
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145 virtual bool is_in_partial_collection(const void *p); |
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146 #endif |
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147 |
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148 bool is_in_young(oop p); // reserved part |
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149 bool is_in_old(oop p); // reserved part |
0 | 150 |
151 // Memory allocation. "gc_time_limit_was_exceeded" will | |
152 // be set to true if the adaptive size policy determine that | |
153 // an excessive amount of time is being spent doing collections | |
154 // and caused a NULL to be returned. If a NULL is not returned, | |
155 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
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156 HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded); |
0 | 157 |
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158 // Allocation attempt(s) during a safepoint. It should never be called |
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159 // to allocate a new TLAB as this allocation might be satisfied out |
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160 // of the old generation. |
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161 HeapWord* failed_mem_allocate(size_t size); |
0 | 162 |
163 // Support for System.gc() | |
164 void collect(GCCause::Cause cause); | |
165 | |
166 // These also should be called by the vm thread at a safepoint (e.g., from a | |
167 // VM operation). | |
168 // | |
169 // The first collects the young generation only, unless the scavenge fails; it | |
170 // will then attempt a full gc. The second collects the entire heap; if | |
171 // maximum_compaction is true, it will compact everything and clear all soft | |
172 // references. | |
173 inline void invoke_scavenge(); | |
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174 |
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175 // Perform a full collection |
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176 virtual void do_full_collection(bool clear_all_soft_refs); |
0 | 177 |
178 bool supports_inline_contig_alloc() const { return !UseNUMA; } | |
141 | 179 |
180 HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; } | |
181 HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; } | |
0 | 182 |
183 void ensure_parsability(bool retire_tlabs); | |
184 void accumulate_statistics_all_tlabs(); | |
185 void resize_all_tlabs(); | |
186 | |
187 size_t unsafe_max_alloc(); | |
188 | |
189 bool supports_tlab_allocation() const { return true; } | |
190 | |
191 size_t tlab_capacity(Thread* thr) const; | |
192 size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
193 | |
342
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194 // Can a compiler initialize a new object without store barriers? |
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195 // This permission only extends from the creation of a new object |
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196 // via a TLAB up to the first subsequent safepoint. |
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197 virtual bool can_elide_tlab_store_barriers() const { |
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198 return true; |
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199 } |
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200 |
1166 | 201 virtual bool card_mark_must_follow_store() const { |
202 return false; | |
203 } | |
204 | |
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205 // Return true if we don't we need a store barrier for |
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206 // initializing stores to an object at this address. |
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207 virtual bool can_elide_initializing_store_barrier(oop new_obj); |
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208 |
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209 void oop_iterate(ExtendedOopClosure* cl); |
0 | 210 void object_iterate(ObjectClosure* cl); |
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211 void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); } |
0 | 212 |
213 HeapWord* block_start(const void* addr) const; | |
214 size_t block_size(const HeapWord* addr) const; | |
215 bool block_is_obj(const HeapWord* addr) const; | |
216 | |
217 jlong millis_since_last_gc(); | |
218 | |
219 void prepare_for_verify(); | |
10405 | 220 PSHeapSummary create_ps_heap_summary(); |
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221 virtual void print_on(outputStream* st) const; |
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222 virtual void print_on_error(outputStream* st) const; |
0 | 223 virtual void print_gc_threads_on(outputStream* st) const; |
224 virtual void gc_threads_do(ThreadClosure* tc) const; | |
225 virtual void print_tracing_info() const; | |
226 | |
6008 | 227 void verify(bool silent, VerifyOption option /* ignored */); |
0 | 228 |
229 void print_heap_change(size_t prev_used); | |
230 | |
231 // Resize the young generation. The reserved space for the | |
232 // generation may be expanded in preparation for the resize. | |
233 void resize_young_gen(size_t eden_size, size_t survivor_size); | |
234 | |
235 // Resize the old generation. The reserved space for the | |
236 // generation may be expanded in preparation for the resize. | |
237 void resize_old_gen(size_t desired_free_space); | |
263
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238 |
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239 // Save the tops of the spaces in all generations |
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240 void record_gen_tops_before_GC() PRODUCT_RETURN; |
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241 |
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242 // Mangle the unused parts of all spaces in the heap |
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243 void gen_mangle_unused_area() PRODUCT_RETURN; |
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244 |
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245 // Call these in sequential code around the processing of strong roots. |
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246 class ParStrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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247 public: |
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248 ParStrongRootsScope(); |
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249 ~ParStrongRootsScope(); |
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250 }; |
0 | 251 }; |
252 | |
1972 | 253 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP |