Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 22b8d3d181d9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 4909 | 2 * Copyright (c) 2002, 2012, 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_PSSCAVENGE_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
| 30 #include "gc_implementation/shared/collectorCounters.hpp" | |
| 31 #include "memory/allocation.hpp" | |
| 32 #include "oops/oop.hpp" | |
| 33 #include "utilities/stack.hpp" | |
| 34 | |
| 0 | 35 class GCTaskManager; |
| 36 class GCTaskQueue; | |
| 37 class OopStack; | |
| 38 class ReferenceProcessor; | |
| 39 class ParallelScavengeHeap; | |
| 40 class PSIsAliveClosure; | |
| 41 class PSRefProcTaskExecutor; | |
| 42 | |
| 43 class PSScavenge: AllStatic { | |
| 44 friend class PSIsAliveClosure; | |
| 45 friend class PSKeepAliveClosure; | |
| 46 friend class PSPromotionManager; | |
| 47 | |
| 48 enum ScavengeSkippedCause { | |
| 49 not_skipped = 0, | |
| 50 to_space_not_empty, | |
| 51 promoted_too_large, | |
| 52 full_follows_scavenge | |
| 53 }; | |
| 54 | |
| 55 // Saved value of to_space->top(), used to prevent objects in to_space from | |
| 56 // being rescanned. | |
| 57 static HeapWord* _to_space_top_before_gc; | |
| 58 | |
| 59 // Number of consecutive attempts to scavenge that were skipped | |
| 60 static int _consecutive_skipped_scavenges; | |
| 61 | |
| 62 | |
| 63 protected: | |
| 64 // Flags/counters | |
| 65 static ReferenceProcessor* _ref_processor; // Reference processor for scavenging. | |
| 66 static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing | |
| 67 static CardTableExtension* _card_table; // We cache the card table for fast access. | |
| 68 static bool _survivor_overflow; // Overflow this collection | |
| 69 static int _tenuring_threshold; // tenuring threshold for next scavenge | |
| 70 static elapsedTimer _accumulated_time; // total time spent on scavenge | |
| 71 static HeapWord* _young_generation_boundary; // The lowest address possible for the young_gen. | |
| 72 // This is used to decide if an oop should be scavenged, | |
| 73 // cards should be marked, etc. | |
| 6197 | 74 static Stack<markOop, mtGC> _preserved_mark_stack; // List of marks to be restored after failed promotion |
| 75 static Stack<oop, mtGC> _preserved_oop_stack; // List of oops that need their mark restored. | |
| 0 | 76 static CollectorCounters* _counters; // collector performance counters |
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77 static bool _promotion_failed; |
| 0 | 78 |
| 79 static void clean_up_failed_promotion(); | |
| 80 | |
| 81 static bool should_attempt_scavenge(); | |
| 82 | |
| 83 static HeapWord* to_space_top_before_gc() { return _to_space_top_before_gc; } | |
| 84 static inline void save_to_space_top_before_gc(); | |
| 85 | |
| 86 // Private accessors | |
| 87 static CardTableExtension* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; } | |
| 88 | |
| 89 public: | |
| 90 // Accessors | |
| 91 static int tenuring_threshold() { return _tenuring_threshold; } | |
| 92 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
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93 static bool promotion_failed() { return _promotion_failed; } |
| 0 | 94 static int consecutive_skipped_scavenges() |
| 95 { return _consecutive_skipped_scavenges; } | |
| 96 | |
| 97 // Performance Counters | |
| 98 static CollectorCounters* counters() { return _counters; } | |
| 99 | |
| 100 // Used by scavenge_contents && psMarkSweep | |
| 101 static ReferenceProcessor* const reference_processor() { | |
| 102 assert(_ref_processor != NULL, "Sanity"); | |
| 103 return _ref_processor; | |
| 104 } | |
| 105 // Used to add tasks | |
| 106 static GCTaskManager* const gc_task_manager(); | |
| 107 // The promotion managers tell us if they encountered overflow | |
| 108 static void set_survivor_overflow(bool state) { | |
| 109 _survivor_overflow = state; | |
| 110 } | |
| 111 // Adaptive size policy support. When the young generation/old generation | |
| 112 // boundary moves, _young_generation_boundary must be reset | |
| 113 static void set_young_generation_boundary(HeapWord* v) { | |
| 114 _young_generation_boundary = v; | |
| 115 } | |
| 116 | |
| 117 // Called by parallelScavengeHeap to init the tenuring threshold | |
| 118 static void initialize(); | |
| 119 | |
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120 // Scavenge entry point. This may invoke a full gc; return true if so. |
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121 static bool invoke(); |
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122 // Return true if a collection was done; false otherwise. |
| 0 | 123 static bool invoke_no_policy(); |
| 124 | |
| 125 // If an attempt to promote fails, this method is invoked | |
| 126 static void oop_promotion_failed(oop obj, markOop obj_mark); | |
| 127 | |
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128 template <class T> static inline bool should_scavenge(T* p); |
| 0 | 129 |
| 130 // These call should_scavenge() above and, if it returns true, also check that | |
| 131 // the object was not newly copied into to_space. The version with the bool | |
| 132 // argument is a convenience wrapper that fetches the to_space pointer from | |
| 133 // the heap and calls the other version (if the arg is true). | |
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134 template <class T> static inline bool should_scavenge(T* p, MutableSpace* to_space); |
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135 template <class T> static inline bool should_scavenge(T* p, bool check_to_space); |
| 0 | 136 |
| 4909 | 137 template <class T, bool promote_immediately> |
| 138 inline static void copy_and_push_safe_barrier(PSPromotionManager* pm, T* p); | |
| 0 | 139 |
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140 static void copy_and_push_safe_barrier_from_klass(PSPromotionManager* pm, oop* p); |
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141 |
| 0 | 142 // Is an object in the young generation |
| 143 // This assumes that the HeapWord argument is in the heap, | |
| 144 // so it only checks one side of the complete predicate. | |
| 145 inline static bool is_obj_in_young(HeapWord* o) { | |
| 146 const bool result = (o >= _young_generation_boundary); | |
| 147 return result; | |
| 148 } | |
| 149 }; | |
| 1972 | 150 |
| 151 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP |