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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp @ 1562:dfe27f03244a
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author | trims |
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * This code is free software; you can redistribute it and/or modify it | |
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7 * published by the Free Software Foundation. | |
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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). | |
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15 * You should have received a copy of the GNU General Public License version | |
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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 GCTaskManager; | |
26 class GCTaskQueue; | |
27 class OopStack; | |
28 class ReferenceProcessor; | |
29 class ParallelScavengeHeap; | |
30 class PSIsAliveClosure; | |
31 class PSRefProcTaskExecutor; | |
32 | |
33 class PSScavenge: AllStatic { | |
34 friend class PSIsAliveClosure; | |
35 friend class PSKeepAliveClosure; | |
36 friend class PSPromotionManager; | |
37 | |
38 enum ScavengeSkippedCause { | |
39 not_skipped = 0, | |
40 to_space_not_empty, | |
41 promoted_too_large, | |
42 full_follows_scavenge | |
43 }; | |
44 | |
45 // Saved value of to_space->top(), used to prevent objects in to_space from | |
46 // being rescanned. | |
47 static HeapWord* _to_space_top_before_gc; | |
48 | |
49 // Number of consecutive attempts to scavenge that were skipped | |
50 static int _consecutive_skipped_scavenges; | |
51 | |
52 | |
53 protected: | |
54 // Flags/counters | |
55 static ReferenceProcessor* _ref_processor; // Reference processor for scavenging. | |
56 static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing | |
57 static CardTableExtension* _card_table; // We cache the card table for fast access. | |
58 static bool _survivor_overflow; // Overflow this collection | |
59 static int _tenuring_threshold; // tenuring threshold for next scavenge | |
60 static elapsedTimer _accumulated_time; // total time spent on scavenge | |
61 static HeapWord* _young_generation_boundary; // The lowest address possible for the young_gen. | |
62 // This is used to decide if an oop should be scavenged, | |
63 // cards should be marked, etc. | |
64 static GrowableArray<markOop>* _preserved_mark_stack; // List of marks to be restored after failed promotion | |
65 static GrowableArray<oop>* _preserved_oop_stack; // List of oops that need their mark restored. | |
66 static CollectorCounters* _counters; // collector performance counters | |
67 | |
68 static void clean_up_failed_promotion(); | |
69 | |
70 static bool should_attempt_scavenge(); | |
71 | |
72 static HeapWord* to_space_top_before_gc() { return _to_space_top_before_gc; } | |
73 static inline void save_to_space_top_before_gc(); | |
74 | |
75 // Private accessors | |
76 static CardTableExtension* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; } | |
77 | |
78 public: | |
79 // Accessors | |
80 static int tenuring_threshold() { return _tenuring_threshold; } | |
81 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
82 static bool promotion_failed() | |
83 { return _preserved_mark_stack != NULL; } | |
84 static int consecutive_skipped_scavenges() | |
85 { return _consecutive_skipped_scavenges; } | |
86 | |
87 // Performance Counters | |
88 static CollectorCounters* counters() { return _counters; } | |
89 | |
90 // Used by scavenge_contents && psMarkSweep | |
91 static ReferenceProcessor* const reference_processor() { | |
92 assert(_ref_processor != NULL, "Sanity"); | |
93 return _ref_processor; | |
94 } | |
95 // Used to add tasks | |
96 static GCTaskManager* const gc_task_manager(); | |
97 // The promotion managers tell us if they encountered overflow | |
98 static void set_survivor_overflow(bool state) { | |
99 _survivor_overflow = state; | |
100 } | |
101 // Adaptive size policy support. When the young generation/old generation | |
102 // boundary moves, _young_generation_boundary must be reset | |
103 static void set_young_generation_boundary(HeapWord* v) { | |
104 _young_generation_boundary = v; | |
105 } | |
106 | |
107 // Called by parallelScavengeHeap to init the tenuring threshold | |
108 static void initialize(); | |
109 | |
110 // Scavenge entry point | |
111 static void invoke(); | |
112 // Return true is a collection was done. Return | |
113 // false if the collection was skipped. | |
114 static bool invoke_no_policy(); | |
115 | |
116 // If an attempt to promote fails, this method is invoked | |
117 static void oop_promotion_failed(oop obj, markOop obj_mark); | |
118 | |
113
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119 template <class T> static inline bool should_scavenge(T* p); |
0 | 120 |
121 // These call should_scavenge() above and, if it returns true, also check that | |
122 // the object was not newly copied into to_space. The version with the bool | |
123 // argument is a convenience wrapper that fetches the to_space pointer from | |
124 // the heap and calls the other version (if the arg is true). | |
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125 template <class T> static inline bool should_scavenge(T* p, MutableSpace* to_space); |
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126 template <class T> static inline bool should_scavenge(T* p, bool check_to_space); |
0 | 127 |
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128 template <class T> inline static void copy_and_push_safe_barrier(PSPromotionManager* pm, T* p); |
0 | 129 |
130 // Is an object in the young generation | |
131 // This assumes that the HeapWord argument is in the heap, | |
132 // so it only checks one side of the complete predicate. | |
133 inline static bool is_obj_in_young(HeapWord* o) { | |
134 const bool result = (o >= _young_generation_boundary); | |
135 return result; | |
136 } | |
137 }; |