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annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 0bfd3fb24150 |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
| 25 class AdjoiningGenerations; | |
| 26 class GCTaskManager; | |
| 27 class PSAdaptiveSizePolicy; | |
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28 class GenerationSizer; |
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29 class CollectorPolicy; |
| 0 | 30 |
| 31 class ParallelScavengeHeap : public CollectedHeap { | |
| 32 friend class VMStructs; | |
| 33 private: | |
| 34 static PSYoungGen* _young_gen; | |
| 35 static PSOldGen* _old_gen; | |
| 36 static PSPermGen* _perm_gen; | |
| 37 | |
| 38 // Sizing policy for entire heap | |
| 39 static PSAdaptiveSizePolicy* _size_policy; | |
| 40 static PSGCAdaptivePolicyCounters* _gc_policy_counters; | |
| 41 | |
| 42 static ParallelScavengeHeap* _psh; | |
| 43 | |
| 44 size_t _perm_gen_alignment; | |
| 45 size_t _young_gen_alignment; | |
| 46 size_t _old_gen_alignment; | |
| 47 | |
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48 GenerationSizer* _collector_policy; |
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49 |
| 0 | 50 inline size_t set_alignment(size_t& var, size_t val); |
| 51 | |
| 52 // Collection of generations that are adjacent in the | |
| 53 // space reserved for the heap. | |
| 54 AdjoiningGenerations* _gens; | |
| 55 | |
| 56 static GCTaskManager* _gc_task_manager; // The task manager. | |
| 57 | |
| 58 protected: | |
| 59 static inline size_t total_invocations(); | |
| 60 HeapWord* allocate_new_tlab(size_t size); | |
| 61 | |
| 62 public: | |
| 63 ParallelScavengeHeap() : CollectedHeap() { | |
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64 set_alignment(_perm_gen_alignment, intra_heap_alignment()); |
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65 set_alignment(_young_gen_alignment, intra_heap_alignment()); |
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66 set_alignment(_old_gen_alignment, intra_heap_alignment()); |
| 0 | 67 } |
| 68 | |
| 69 // For use by VM operations | |
| 70 enum CollectionType { | |
| 71 Scavenge, | |
| 72 MarkSweep | |
| 73 }; | |
| 74 | |
| 75 ParallelScavengeHeap::Name kind() const { | |
| 76 return CollectedHeap::ParallelScavengeHeap; | |
| 77 } | |
| 78 | |
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79 CollectorPolicy* collector_policy() const { return (CollectorPolicy*) _collector_policy; } |
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80 // GenerationSizer* collector_policy() const { return _collector_policy; } |
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81 |
| 0 | 82 static PSYoungGen* young_gen() { return _young_gen; } |
| 83 static PSOldGen* old_gen() { return _old_gen; } | |
| 84 static PSPermGen* perm_gen() { return _perm_gen; } | |
| 85 | |
| 86 virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; } | |
| 87 | |
| 88 static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; } | |
| 89 | |
| 90 static ParallelScavengeHeap* heap(); | |
| 91 | |
| 92 static GCTaskManager* const gc_task_manager() { return _gc_task_manager; } | |
| 93 | |
| 94 AdjoiningGenerations* gens() { return _gens; } | |
| 95 | |
| 96 // Returns JNI_OK on success | |
| 97 virtual jint initialize(); | |
| 98 | |
| 99 void post_initialize(); | |
| 100 void update_counters(); | |
| 101 // The alignment used for the various generations. | |
| 102 size_t perm_gen_alignment() const { return _perm_gen_alignment; } | |
| 103 size_t young_gen_alignment() const { return _young_gen_alignment; } | |
| 104 size_t old_gen_alignment() const { return _old_gen_alignment; } | |
| 105 | |
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106 // The alignment used for eden and survivors within the young gen |
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107 // and for boundary between young gen and old gen. |
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108 size_t intra_heap_alignment() const { return 64 * K; } |
| 0 | 109 |
| 110 size_t capacity() const; | |
| 111 size_t used() const; | |
| 112 | |
| 113 // Return "true" if all generations (but perm) have reached the | |
| 114 // maximal committed limit that they can reach, without a garbage | |
| 115 // collection. | |
| 116 virtual bool is_maximal_no_gc() const; | |
| 117 | |
| 118 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 119 bool supports_heap_inspection() const { return true; } | |
| 120 | |
| 121 size_t permanent_capacity() const; | |
| 122 size_t permanent_used() const; | |
| 123 | |
| 124 size_t max_capacity() const; | |
| 125 | |
| 126 // Whether p is in the allocated part of the heap | |
| 127 bool is_in(const void* p) const; | |
| 128 | |
| 129 bool is_in_reserved(const void* p) const; | |
| 130 bool is_in_permanent(const void *p) const { // reserved part | |
| 131 return perm_gen()->reserved().contains(p); | |
| 132 } | |
| 133 | |
| 134 bool is_permanent(const void *p) const { // committed part | |
| 135 return perm_gen()->is_in(p); | |
| 136 } | |
| 137 | |
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138 inline bool is_in_young(oop p); // reserved part |
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139 inline bool is_in_old_or_perm(oop p); // reserved part |
| 0 | 140 |
| 141 // Memory allocation. "gc_time_limit_was_exceeded" will | |
| 142 // be set to true if the adaptive size policy determine that | |
| 143 // an excessive amount of time is being spent doing collections | |
| 144 // and caused a NULL to be returned. If a NULL is not returned, | |
| 145 // "gc_time_limit_was_exceeded" has an undefined meaning. | |
| 146 | |
| 147 HeapWord* mem_allocate(size_t size, | |
| 148 bool is_noref, | |
| 149 bool is_tlab, | |
| 150 bool* gc_overhead_limit_was_exceeded); | |
| 151 HeapWord* failed_mem_allocate(size_t size, bool is_tlab); | |
| 152 | |
| 153 HeapWord* permanent_mem_allocate(size_t size); | |
| 154 HeapWord* failed_permanent_mem_allocate(size_t size); | |
| 155 | |
| 156 // Support for System.gc() | |
| 157 void collect(GCCause::Cause cause); | |
| 158 | |
| 159 // This interface assumes that it's being called by the | |
| 160 // vm thread. It collects the heap assuming that the | |
| 161 // heap lock is already held and that we are executing in | |
| 162 // the context of the vm thread. | |
| 163 void collect_as_vm_thread(GCCause::Cause cause); | |
| 164 | |
| 165 // These also should be called by the vm thread at a safepoint (e.g., from a | |
| 166 // VM operation). | |
| 167 // | |
| 168 // The first collects the young generation only, unless the scavenge fails; it | |
| 169 // will then attempt a full gc. The second collects the entire heap; if | |
| 170 // maximum_compaction is true, it will compact everything and clear all soft | |
| 171 // references. | |
| 172 inline void invoke_scavenge(); | |
| 173 inline void invoke_full_gc(bool maximum_compaction); | |
| 174 | |
| 175 size_t large_typearray_limit() { return FastAllocateSizeLimit; } | |
| 176 | |
| 177 bool supports_inline_contig_alloc() const { return !UseNUMA; } | |
| 141 | 178 |
| 179 HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; } | |
| 180 HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; } | |
| 0 | 181 |
| 182 void ensure_parsability(bool retire_tlabs); | |
| 183 void accumulate_statistics_all_tlabs(); | |
| 184 void resize_all_tlabs(); | |
| 185 | |
| 186 size_t unsafe_max_alloc(); | |
| 187 | |
| 188 bool supports_tlab_allocation() const { return true; } | |
| 189 | |
| 190 size_t tlab_capacity(Thread* thr) const; | |
| 191 size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 192 | |
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193 // Can a compiler initialize a new object without store barriers? |
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194 // This permission only extends from the creation of a new object |
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195 // via a TLAB up to the first subsequent safepoint. |
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196 virtual bool can_elide_tlab_store_barriers() const { |
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197 return true; |
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198 } |
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199 |
| 1166 | 200 virtual bool card_mark_must_follow_store() const { |
| 201 return false; | |
| 202 } | |
| 203 | |
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204 // Return true if we don't we need a store barrier for |
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205 // initializing stores to an object at this address. |
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206 virtual bool can_elide_initializing_store_barrier(oop new_obj); |
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207 |
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208 // Can a compiler elide a store barrier when it writes |
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209 // a permanent oop into the heap? Applies when the compiler |
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210 // is storing x to the heap, where x->is_perm() is true. |
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211 virtual bool can_elide_permanent_oop_store_barriers() const { |
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212 return true; |
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213 } |
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214 |
| 0 | 215 void oop_iterate(OopClosure* cl); |
| 216 void object_iterate(ObjectClosure* cl); | |
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217 void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); } |
| 0 | 218 void permanent_oop_iterate(OopClosure* cl); |
| 219 void permanent_object_iterate(ObjectClosure* cl); | |
| 220 | |
| 221 HeapWord* block_start(const void* addr) const; | |
| 222 size_t block_size(const HeapWord* addr) const; | |
| 223 bool block_is_obj(const HeapWord* addr) const; | |
| 224 | |
| 225 jlong millis_since_last_gc(); | |
| 226 | |
| 227 void prepare_for_verify(); | |
| 228 void print() const; | |
| 229 void print_on(outputStream* st) const; | |
| 230 virtual void print_gc_threads_on(outputStream* st) const; | |
| 231 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 232 virtual void print_tracing_info() const; | |
| 233 | |
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234 void verify(bool allow_dirty, bool silent, bool /* option */); |
| 0 | 235 |
| 236 void print_heap_change(size_t prev_used); | |
| 237 | |
| 238 // Resize the young generation. The reserved space for the | |
| 239 // generation may be expanded in preparation for the resize. | |
| 240 void resize_young_gen(size_t eden_size, size_t survivor_size); | |
| 241 | |
| 242 // Resize the old generation. The reserved space for the | |
| 243 // generation may be expanded in preparation for the resize. | |
| 244 void resize_old_gen(size_t desired_free_space); | |
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245 |
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246 // Save the tops of the spaces in all generations |
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247 void record_gen_tops_before_GC() PRODUCT_RETURN; |
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248 |
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249 // Mangle the unused parts of all spaces in the heap |
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250 void gen_mangle_unused_area() PRODUCT_RETURN; |
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251 |
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252 // Call these in sequential code around the processing of strong roots. |
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253 class ParStrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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254 public: |
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255 ParStrongRootsScope(); |
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256 ~ParStrongRootsScope(); |
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257 }; |
| 0 | 258 }; |
| 259 | |
| 260 inline size_t ParallelScavengeHeap::set_alignment(size_t& var, size_t val) | |
| 261 { | |
| 262 assert(is_power_of_2((intptr_t)val), "must be a power of 2"); | |
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263 var = round_to(val, intra_heap_alignment()); |
| 0 | 264 return var; |
| 265 } |