Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
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| 0 | 1 /* |
| 17524 | 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_PSOLDGEN_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSOLDGEN_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psGenerationCounters.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
| 31 #include "gc_implementation/shared/mutableSpace.hpp" | |
| 32 #include "gc_implementation/shared/spaceCounters.hpp" | |
| 33 #include "runtime/safepoint.hpp" | |
| 34 | |
| 0 | 35 class PSMarkSweepDecorator; |
| 36 | |
| 6197 | 37 class PSOldGen : public CHeapObj<mtGC> { |
| 0 | 38 friend class VMStructs; |
| 39 friend class PSPromotionManager; // Uses the cas_allocate methods | |
| 40 friend class ParallelScavengeHeap; | |
| 41 friend class AdjoiningGenerations; | |
| 42 | |
| 43 protected: | |
| 44 MemRegion _reserved; // Used for simple containment tests | |
| 45 PSVirtualSpace* _virtual_space; // Controls mapping and unmapping of virtual mem | |
| 46 ObjectStartArray _start_array; // Keeps track of where objects start in a 512b block | |
| 47 MutableSpace* _object_space; // Where all the objects live | |
| 48 PSMarkSweepDecorator* _object_mark_sweep; // The mark sweep view of _object_space | |
| 49 const char* const _name; // Name of this generation. | |
| 50 | |
| 51 // Performance Counters | |
| 52 PSGenerationCounters* _gen_counters; | |
| 53 SpaceCounters* _space_counters; | |
| 54 | |
| 55 // Sizing information, in bytes, set in constructor | |
| 56 const size_t _init_gen_size; | |
| 57 const size_t _min_gen_size; | |
| 58 const size_t _max_gen_size; | |
| 59 | |
| 60 // Used when initializing the _name field. | |
| 61 static inline const char* select_name(); | |
| 62 | |
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63 HeapWord* allocate_noexpand(size_t word_size) { |
| 0 | 64 // We assume the heap lock is held here. |
| 65 assert_locked_or_safepoint(Heap_lock); | |
| 66 HeapWord* res = object_space()->allocate(word_size); | |
| 67 if (res != NULL) { | |
| 68 _start_array.allocate_block(res); | |
| 69 } | |
| 70 return res; | |
| 71 } | |
| 72 | |
| 73 // Support for MT garbage collection. CAS allocation is lower overhead than grabbing | |
| 74 // and releasing the heap lock, which is held during gc's anyway. This method is not | |
| 75 // safe for use at the same time as allocate_noexpand()! | |
| 76 HeapWord* cas_allocate_noexpand(size_t word_size) { | |
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77 assert(SafepointSynchronize::is_at_safepoint(), "Must only be called at safepoint"); |
| 0 | 78 HeapWord* res = object_space()->cas_allocate(word_size); |
| 79 if (res != NULL) { | |
| 80 _start_array.allocate_block(res); | |
| 81 } | |
| 82 return res; | |
| 83 } | |
| 84 | |
| 85 // Support for MT garbage collection. See above comment. | |
| 86 HeapWord* cas_allocate(size_t word_size) { | |
| 87 HeapWord* res = cas_allocate_noexpand(word_size); | |
| 88 return (res == NULL) ? expand_and_cas_allocate(word_size) : res; | |
| 89 } | |
| 90 | |
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91 HeapWord* expand_and_allocate(size_t word_size); |
| 0 | 92 HeapWord* expand_and_cas_allocate(size_t word_size); |
| 93 void expand(size_t bytes); | |
| 94 bool expand_by(size_t bytes); | |
| 95 bool expand_to_reserved(); | |
| 96 | |
| 97 void shrink(size_t bytes); | |
| 98 | |
| 99 void post_resize(); | |
| 100 | |
| 101 public: | |
| 102 // Initialize the generation. | |
| 103 PSOldGen(ReservedSpace rs, size_t alignment, | |
| 104 size_t initial_size, size_t min_size, size_t max_size, | |
| 105 const char* perf_data_name, int level); | |
| 106 | |
| 107 PSOldGen(size_t initial_size, size_t min_size, size_t max_size, | |
| 108 const char* perf_data_name, int level); | |
| 109 | |
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110 virtual void initialize(ReservedSpace rs, size_t alignment, |
| 0 | 111 const char* perf_data_name, int level); |
| 112 void initialize_virtual_space(ReservedSpace rs, size_t alignment); | |
| 11038 | 113 virtual void initialize_work(const char* perf_data_name, int level); |
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114 virtual void initialize_performance_counters(const char* perf_data_name, int level); |
| 0 | 115 |
| 116 MemRegion reserved() const { return _reserved; } | |
| 117 virtual size_t max_gen_size() { return _max_gen_size; } | |
| 118 size_t min_gen_size() { return _min_gen_size; } | |
| 119 | |
| 120 // Returns limit on the maximum size of the generation. This | |
| 121 // is the same as _max_gen_size for PSOldGen but need not be | |
| 122 // for a derived class. | |
| 123 virtual size_t gen_size_limit(); | |
| 124 | |
| 125 bool is_in(const void* p) const { | |
| 126 return _virtual_space->contains((void *)p); | |
| 127 } | |
| 128 | |
| 129 bool is_in_reserved(const void* p) const { | |
| 130 return reserved().contains(p); | |
| 131 } | |
| 132 | |
| 133 MutableSpace* object_space() const { return _object_space; } | |
| 134 PSMarkSweepDecorator* object_mark_sweep() const { return _object_mark_sweep; } | |
| 135 ObjectStartArray* start_array() { return &_start_array; } | |
| 136 PSVirtualSpace* virtual_space() const { return _virtual_space;} | |
| 137 | |
| 138 // Has the generation been successfully allocated? | |
| 139 bool is_allocated(); | |
| 140 | |
| 141 // MarkSweep methods | |
| 142 virtual void precompact(); | |
| 143 void adjust_pointers(); | |
| 144 void compact(); | |
| 145 | |
| 146 // Size info | |
| 147 size_t capacity_in_bytes() const { return object_space()->capacity_in_bytes(); } | |
| 148 size_t used_in_bytes() const { return object_space()->used_in_bytes(); } | |
| 149 size_t free_in_bytes() const { return object_space()->free_in_bytes(); } | |
| 150 | |
| 151 size_t capacity_in_words() const { return object_space()->capacity_in_words(); } | |
| 152 size_t used_in_words() const { return object_space()->used_in_words(); } | |
| 153 size_t free_in_words() const { return object_space()->free_in_words(); } | |
| 154 | |
| 155 // Includes uncommitted memory | |
| 156 size_t contiguous_available() const; | |
| 157 | |
| 158 bool is_maximal_no_gc() const { | |
| 159 return virtual_space()->uncommitted_size() == 0; | |
| 160 } | |
| 161 | |
| 162 // Calculating new sizes | |
| 163 void resize(size_t desired_free_space); | |
| 164 | |
| 165 // Allocation. We report all successful allocations to the size policy | |
| 166 // Note that the perm gen does not use this method, and should not! | |
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167 HeapWord* allocate(size_t word_size); |
| 0 | 168 |
| 169 // Iteration. | |
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170 void oop_iterate_no_header(OopClosure* cl) { object_space()->oop_iterate_no_header(cl); } |
| 0 | 171 void object_iterate(ObjectClosure* cl) { object_space()->object_iterate(cl); } |
| 172 | |
| 173 // Debugging - do not use for time critical operations | |
| 174 virtual void print() const; | |
| 175 virtual void print_on(outputStream* st) const; | |
| 176 void print_used_change(size_t prev_used) const; | |
| 177 | |
| 6008 | 178 void verify(); |
| 0 | 179 void verify_object_start_array(); |
| 180 | |
| 181 // These should not used | |
| 182 virtual void reset_after_change(); | |
| 183 | |
| 184 // These should not used | |
| 185 virtual size_t available_for_expansion(); | |
| 186 virtual size_t available_for_contraction(); | |
| 187 | |
| 188 void space_invariants() PRODUCT_RETURN; | |
| 189 | |
| 14909 | 190 // Performace Counter support |
| 0 | 191 void update_counters(); |
| 192 | |
| 193 // Printing support | |
| 194 virtual const char* name() const { return _name; } | |
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195 |
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196 // Debugging support |
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197 // Save the tops of all spaces for later use during mangling. |
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198 void record_spaces_top() PRODUCT_RETURN; |
| 0 | 199 }; |
| 1972 | 200 |
| 201 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSOLDGEN_HPP |