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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp @ 9693:d04944441454
cleaned up and simplified runtime call mechanisms
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 14 May 2013 21:33:37 +0200 |
parents | 22b8d3d181d9 |
children | 47bdfb3d010f |
rev | line source |
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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 | |
6818 | 69 static uint _tenuring_threshold; // tenuring threshold for next scavenge |
0 | 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. | |
6818 | 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 | |
6818 | 91 static uint tenuring_threshold() { return _tenuring_threshold; } |
0 | 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 | |
113
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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). | |
113
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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 |