Mercurial > hg > graal-compiler
annotate src/share/vm/memory/referenceProcessor.hpp @ 10031:ebb32c4589f3
Force GC to process graal_installed_code references during marking (GRAAL-257)
| author | Christos Kotselidis <christos.kotselidis@oracle.com> |
|---|---|
| date | Tue, 11 Jun 2013 19:59:52 +0200 |
| parents | da91efe96a93 |
| children | 836a62f43af9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
2 * Copyright (c) 2001, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1244
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1244
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1244
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |
| 26 #define SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP | |
| 27 | |
| 28 #include "memory/referencePolicy.hpp" | |
| 29 #include "oops/instanceRefKlass.hpp" | |
| 30 | |
| 0 | 31 // ReferenceProcessor class encapsulates the per-"collector" processing |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
32 // of java.lang.Reference objects for GC. The interface is useful for supporting |
| 0 | 33 // a generational abstraction, in particular when there are multiple |
| 34 // generations that are being independently collected -- possibly | |
| 35 // concurrently and/or incrementally. Note, however, that the | |
| 36 // ReferenceProcessor class abstracts away from a generational setting | |
| 37 // by using only a heap interval (called "span" below), thus allowing | |
| 38 // its use in a straightforward manner in a general, non-generational | |
| 39 // setting. | |
| 40 // | |
| 41 // The basic idea is that each ReferenceProcessor object concerns | |
| 42 // itself with ("weak") reference processing in a specific "span" | |
| 43 // of the heap of interest to a specific collector. Currently, | |
| 44 // the span is a convex interval of the heap, but, efficiency | |
| 45 // apart, there seems to be no reason it couldn't be extended | |
| 46 // (with appropriate modifications) to any "non-convex interval". | |
| 47 | |
| 48 // forward references | |
| 49 class ReferencePolicy; | |
| 50 class AbstractRefProcTaskExecutor; | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
51 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
52 // List of discovered references. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
53 class DiscoveredList { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
54 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
55 DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
56 oop head() const { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
57 return UseCompressedOops ? oopDesc::decode_heap_oop(_compressed_head) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
58 _oop_head; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
59 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
60 HeapWord* adr_head() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
61 return UseCompressedOops ? (HeapWord*)&_compressed_head : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
62 (HeapWord*)&_oop_head; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
63 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
64 void set_head(oop o) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
65 if (UseCompressedOops) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
66 // Must compress the head ptr. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
67 _compressed_head = oopDesc::encode_heap_oop(o); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
68 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
69 _oop_head = o; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
70 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
71 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
72 bool is_empty() const { return head() == NULL; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
73 size_t length() { return _len; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
74 void set_length(size_t len) { _len = len; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
75 void inc_length(size_t inc) { _len += inc; assert(_len > 0, "Error"); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
76 void dec_length(size_t dec) { _len -= dec; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
77 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
78 // Set value depending on UseCompressedOops. This could be a template class |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
79 // but then we have to fix all the instantiations and declarations that use this class. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
80 oop _oop_head; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
81 narrowOop _compressed_head; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
82 size_t _len; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
83 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
84 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
85 // Iterator for the list of discovered references. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
86 class DiscoveredListIterator { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
87 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
88 DiscoveredList& _refs_list; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
89 HeapWord* _prev_next; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
90 oop _prev; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
91 oop _ref; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
92 HeapWord* _discovered_addr; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
93 oop _next; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
94 HeapWord* _referent_addr; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
95 oop _referent; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
96 OopClosure* _keep_alive; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
97 BoolObjectClosure* _is_alive; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
98 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
99 DEBUG_ONLY( |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
100 oop _first_seen; // cyclic linked list check |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
101 ) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
102 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
103 NOT_PRODUCT( |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
104 size_t _processed; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
105 size_t _removed; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
106 ) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
107 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
108 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
109 inline DiscoveredListIterator(DiscoveredList& refs_list, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
110 OopClosure* keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
111 BoolObjectClosure* is_alive): |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
112 _refs_list(refs_list), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
113 _prev_next(refs_list.adr_head()), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
114 _prev(NULL), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
115 _ref(refs_list.head()), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
116 #ifdef ASSERT |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
117 _first_seen(refs_list.head()), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
118 #endif |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
119 #ifndef PRODUCT |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
120 _processed(0), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
121 _removed(0), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
122 #endif |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
123 _next(NULL), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
124 _keep_alive(keep_alive), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
125 _is_alive(is_alive) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
126 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
127 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
128 // End Of List. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
129 inline bool has_next() const { return _ref != NULL; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
130 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
131 // Get oop to the Reference object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
132 inline oop obj() const { return _ref; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
133 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
134 // Get oop to the referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
135 inline oop referent() const { return _referent; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
136 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
137 // Returns true if referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
138 inline bool is_referent_alive() const { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
139 return _is_alive->do_object_b(_referent); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
140 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
141 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
142 // Loads data for the current reference. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
143 // The "allow_null_referent" argument tells us to allow for the possibility |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
144 // of a NULL referent in the discovered Reference object. This typically |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
145 // happens in the case of concurrent collectors that may have done the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
146 // discovery concurrently, or interleaved, with mutator execution. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
147 void load_ptrs(DEBUG_ONLY(bool allow_null_referent)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
148 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
149 // Move to the next discovered reference. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
150 inline void next() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
151 _prev_next = _discovered_addr; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
152 _prev = _ref; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
153 move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
154 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
155 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
156 // Remove the current reference from the list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
157 void remove(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
158 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
159 // Make the Reference object active again. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
160 void make_active(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
161 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
162 // Make the referent alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
163 inline void make_referent_alive() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
164 if (UseCompressedOops) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
165 _keep_alive->do_oop((narrowOop*)_referent_addr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
166 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
167 _keep_alive->do_oop((oop*)_referent_addr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
168 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
169 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
171 // Update the discovered field. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
172 inline void update_discovered() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
173 // First _prev_next ref actually points into DiscoveredList (gross). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
174 if (UseCompressedOops) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
175 if (!oopDesc::is_null(*(narrowOop*)_prev_next)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
176 _keep_alive->do_oop((narrowOop*)_prev_next); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
177 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
178 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
179 if (!oopDesc::is_null(*(oop*)_prev_next)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
180 _keep_alive->do_oop((oop*)_prev_next); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
181 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
182 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
183 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
184 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
185 // NULL out referent pointer. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
186 void clear_referent(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
187 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
188 // Statistics |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
189 NOT_PRODUCT( |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
190 inline size_t processed() const { return _processed; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
191 inline size_t removed() const { return _removed; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
192 ) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
193 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
194 inline void move_to_next() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
195 if (_ref == _next) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
196 // End of the list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
197 _ref = NULL; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
198 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
199 _ref = _next; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
200 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
201 assert(_ref != _first_seen, "cyclic ref_list found"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
202 NOT_PRODUCT(_processed++); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
203 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
204 }; |
| 0 | 205 |
| 6197 | 206 class ReferenceProcessor : public CHeapObj<mtGC> { |
| 0 | 207 protected: |
|
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
208 // Compatibility with pre-4965777 JDK's |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
209 static bool _pending_list_uses_discovered_field; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
210 |
|
3992
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
211 // The SoftReference master timestamp clock |
|
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
212 static jlong _soft_ref_timestamp_clock; |
|
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
213 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
214 MemRegion _span; // (right-open) interval of heap |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
215 // subject to wkref discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
216 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
217 bool _discovering_refs; // true when discovery enabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
218 bool _discovery_is_atomic; // if discovery is atomic wrt |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
219 // other collectors in configuration |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
220 bool _discovery_is_mt; // true if reference discovery is MT. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
221 |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
222 // If true, setting "next" field of a discovered refs list requires |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
223 // write barrier(s). (Must be true if used in a collector in which |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
224 // elements of a discovered list may be moved during discovery: for |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
225 // example, a collector like Garbage-First that moves objects during a |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
226 // long-term concurrent marking phase that does weak reference |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
227 // discovery.) |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
228 bool _discovered_list_needs_barrier; |
| 0 | 229 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
230 BarrierSet* _bs; // Cached copy of BarrierSet. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
231 bool _enqueuing_is_done; // true if all weak references enqueued |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
232 bool _processing_is_mt; // true during phases when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
233 // reference processing is MT. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
234 uint _next_id; // round-robin mod _num_q counter in |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
235 // support of work distribution |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
236 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
237 // For collectors that do not keep GC liveness information |
| 0 | 238 // in the object header, this field holds a closure that |
| 239 // helps the reference processor determine the reachability | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
240 // of an oop. It is currently initialized to NULL for all |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
241 // collectors except for CMS and G1. |
| 0 | 242 BoolObjectClosure* _is_alive_non_header; |
| 243 | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
244 // Soft ref clearing policies |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
245 // . the default policy |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
246 static ReferencePolicy* _default_soft_ref_policy; |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
247 // . the "clear all" policy |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
248 static ReferencePolicy* _always_clear_soft_ref_policy; |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
249 // . the current policy below is either one of the above |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
250 ReferencePolicy* _current_soft_ref_policy; |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
251 |
| 0 | 252 // The discovered ref lists themselves |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
253 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
254 // The active MT'ness degree of the queues below |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
255 uint _num_q; |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
256 // The maximum MT'ness degree of the queues below |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
257 uint _max_num_q; |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
258 |
|
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
259 // Master array of discovered oops |
|
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
260 DiscoveredList* _discovered_refs; |
|
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
261 |
|
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
262 // Arrays of lists of oops, one per thread (pointers into master array above) |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
263 DiscoveredList* _discoveredSoftRefs; |
| 0 | 264 DiscoveredList* _discoveredWeakRefs; |
| 265 DiscoveredList* _discoveredFinalRefs; | |
| 266 DiscoveredList* _discoveredPhantomRefs; | |
| 267 | |
| 268 public: | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
269 static int number_of_subclasses_of_ref() { return (REF_PHANTOM - REF_OTHER); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
270 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
271 uint num_q() { return _num_q; } |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
272 uint max_num_q() { return _max_num_q; } |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
273 void set_active_mt_degree(uint v) { _num_q = v; } |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
274 |
|
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
275 DiscoveredList* discovered_refs() { return _discovered_refs; } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
276 |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
277 ReferencePolicy* setup_policy(bool always_clear) { |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
278 _current_soft_ref_policy = always_clear ? |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
279 _always_clear_soft_ref_policy : _default_soft_ref_policy; |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
280 _current_soft_ref_policy->setup(); // snapshot the policy threshold |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
281 return _current_soft_ref_policy; |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
282 } |
| 0 | 283 |
| 284 // Process references with a certain reachability level. | |
| 285 void process_discovered_reflist(DiscoveredList refs_lists[], | |
| 286 ReferencePolicy* policy, | |
| 287 bool clear_referent, | |
| 288 BoolObjectClosure* is_alive, | |
| 289 OopClosure* keep_alive, | |
| 290 VoidClosure* complete_gc, | |
| 291 AbstractRefProcTaskExecutor* task_executor); | |
| 292 | |
| 293 void process_phaseJNI(BoolObjectClosure* is_alive, | |
| 294 OopClosure* keep_alive, | |
| 295 VoidClosure* complete_gc); | |
|
10031
ebb32c4589f3
Force GC to process graal_installed_code references during marking (GRAAL-257)
Christos Kotselidis <christos.kotselidis@oracle.com>
parents:
6725
diff
changeset
|
296 #ifdef GRAAL |
|
ebb32c4589f3
Force GC to process graal_installed_code references during marking (GRAAL-257)
Christos Kotselidis <christos.kotselidis@oracle.com>
parents:
6725
diff
changeset
|
297 void process_phaseGraalNMethods(OopClosure* keep_alive, |
|
ebb32c4589f3
Force GC to process graal_installed_code references during marking (GRAAL-257)
Christos Kotselidis <christos.kotselidis@oracle.com>
parents:
6725
diff
changeset
|
298 VoidClosure* complete_gc); |
|
ebb32c4589f3
Force GC to process graal_installed_code references during marking (GRAAL-257)
Christos Kotselidis <christos.kotselidis@oracle.com>
parents:
6725
diff
changeset
|
299 #endif |
| 0 | 300 |
| 301 // Work methods used by the method process_discovered_reflist | |
| 302 // Phase1: keep alive all those referents that are otherwise | |
| 303 // dead but which must be kept alive by policy (and their closure). | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
304 void process_phase1(DiscoveredList& refs_list, |
| 0 | 305 ReferencePolicy* policy, |
| 306 BoolObjectClosure* is_alive, | |
| 307 OopClosure* keep_alive, | |
| 308 VoidClosure* complete_gc); | |
| 309 // Phase2: remove all those references whose referents are | |
| 310 // reachable. | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
311 inline void process_phase2(DiscoveredList& refs_list, |
| 0 | 312 BoolObjectClosure* is_alive, |
| 313 OopClosure* keep_alive, | |
| 314 VoidClosure* complete_gc) { | |
| 315 if (discovery_is_atomic()) { | |
| 316 // complete_gc is ignored in this case for this phase | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
317 pp2_work(refs_list, is_alive, keep_alive); |
| 0 | 318 } else { |
| 319 assert(complete_gc != NULL, "Error"); | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
320 pp2_work_concurrent_discovery(refs_list, is_alive, |
| 0 | 321 keep_alive, complete_gc); |
| 322 } | |
| 323 } | |
| 324 // Work methods in support of process_phase2 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
325 void pp2_work(DiscoveredList& refs_list, |
| 0 | 326 BoolObjectClosure* is_alive, |
| 327 OopClosure* keep_alive); | |
| 328 void pp2_work_concurrent_discovery( | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
329 DiscoveredList& refs_list, |
| 0 | 330 BoolObjectClosure* is_alive, |
| 331 OopClosure* keep_alive, | |
| 332 VoidClosure* complete_gc); | |
| 333 // Phase3: process the referents by either clearing them | |
| 334 // or keeping them alive (and their closure) | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
335 void process_phase3(DiscoveredList& refs_list, |
| 0 | 336 bool clear_referent, |
| 337 BoolObjectClosure* is_alive, | |
| 338 OopClosure* keep_alive, | |
| 339 VoidClosure* complete_gc); | |
| 340 | |
| 341 // Enqueue references with a certain reachability level | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
342 void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr); |
| 0 | 343 |
| 344 // "Preclean" all the discovered reference lists | |
| 345 // by removing references with strongly reachable referents. | |
| 346 // The first argument is a predicate on an oop that indicates | |
| 347 // its (strong) reachability and the second is a closure that | |
| 348 // may be used to incrementalize or abort the precleaning process. | |
| 349 // The caller is responsible for taking care of potential | |
| 350 // interference with concurrent operations on these lists | |
| 351 // (or predicates involved) by other threads. Currently | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
352 // only used by the CMS collector. |
| 0 | 353 void preclean_discovered_references(BoolObjectClosure* is_alive, |
| 354 OopClosure* keep_alive, | |
| 355 VoidClosure* complete_gc, | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
356 YieldClosure* yield); |
| 0 | 357 |
| 358 // Delete entries in the discovered lists that have | |
| 359 // either a null referent or are not active. Such | |
| 360 // Reference objects can result from the clearing | |
| 361 // or enqueueing of Reference objects concurrent | |
| 362 // with their discovery by a (concurrent) collector. | |
| 363 // For a definition of "active" see java.lang.ref.Reference; | |
| 364 // Refs are born active, become inactive when enqueued, | |
| 365 // and never become active again. The state of being | |
| 366 // active is encoded as follows: A Ref is active | |
| 367 // if and only if its "next" field is NULL. | |
| 368 void clean_up_discovered_references(); | |
| 369 void clean_up_discovered_reflist(DiscoveredList& refs_list); | |
| 370 | |
| 371 // Returns the name of the discovered reference list | |
| 372 // occupying the i / _num_q slot. | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
373 const char* list_name(uint i); |
| 0 | 374 |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
375 void enqueue_discovered_reflists(HeapWord* pending_list_addr, AbstractRefProcTaskExecutor* task_executor); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
376 |
| 0 | 377 protected: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
378 // Set the 'discovered' field of the given reference to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
379 // the given value - emitting barriers depending upon |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
380 // the value of _discovered_list_needs_barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
381 void set_discovered(oop ref, oop value); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
382 |
| 0 | 383 // "Preclean" the given discovered reference list |
| 384 // by removing references with strongly reachable referents. | |
| 385 // Currently used in support of CMS only. | |
| 386 void preclean_discovered_reflist(DiscoveredList& refs_list, | |
| 387 BoolObjectClosure* is_alive, | |
| 388 OopClosure* keep_alive, | |
| 389 VoidClosure* complete_gc, | |
| 390 YieldClosure* yield); | |
| 391 | |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
392 // round-robin mod _num_q (not: _not_ mode _max_num_q) |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
393 uint next_id() { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
394 uint id = _next_id; |
| 0 | 395 if (++_next_id == _num_q) { |
| 396 _next_id = 0; | |
| 397 } | |
| 398 return id; | |
| 399 } | |
| 400 DiscoveredList* get_discovered_list(ReferenceType rt); | |
| 401 inline void add_to_discovered_list_mt(DiscoveredList& refs_list, oop obj, | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
402 HeapWord* discovered_addr); |
| 0 | 403 void verify_ok_to_handle_reflists() PRODUCT_RETURN; |
| 404 | |
|
3915
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
2369
diff
changeset
|
405 void clear_discovered_references(DiscoveredList& refs_list); |
| 0 | 406 void abandon_partial_discovered_list(DiscoveredList& refs_list); |
| 407 | |
| 408 // Calculate the number of jni handles. | |
| 409 unsigned int count_jni_refs(); | |
| 410 | |
| 411 // Balances reference queues. | |
| 412 void balance_queues(DiscoveredList ref_lists[]); | |
| 413 | |
| 414 // Update (advance) the soft ref master clock field. | |
| 415 void update_soft_ref_master_clock(); | |
| 416 | |
| 417 public: | |
| 418 // constructor | |
| 419 ReferenceProcessor(): | |
| 420 _span((HeapWord*)NULL, (HeapWord*)NULL), | |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
421 _discovered_refs(NULL), |
| 0 | 422 _discoveredSoftRefs(NULL), _discoveredWeakRefs(NULL), |
| 423 _discoveredFinalRefs(NULL), _discoveredPhantomRefs(NULL), | |
| 424 _discovering_refs(false), | |
| 425 _discovery_is_atomic(true), | |
| 426 _enqueuing_is_done(false), | |
| 427 _discovery_is_mt(false), | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
428 _discovered_list_needs_barrier(false), |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
429 _bs(NULL), |
| 0 | 430 _is_alive_non_header(NULL), |
| 431 _num_q(0), | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
432 _max_num_q(0), |
| 0 | 433 _processing_is_mt(false), |
| 434 _next_id(0) | |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
435 { } |
| 0 | 436 |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
437 // Default parameters give you a vanilla reference processor. |
|
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
438 ReferenceProcessor(MemRegion span, |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
439 bool mt_processing = false, uint mt_processing_degree = 1, |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
440 bool mt_discovery = false, uint mt_discovery_degree = 1, |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
441 bool atomic_discovery = true, |
|
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
442 BoolObjectClosure* is_alive_non_header = NULL, |
|
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
443 bool discovered_list_needs_barrier = false); |
|
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
444 |
| 0 | 445 // RefDiscoveryPolicy values |
|
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
446 enum DiscoveryPolicy { |
| 0 | 447 ReferenceBasedDiscovery = 0, |
|
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
448 ReferentBasedDiscovery = 1, |
|
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
449 DiscoveryPolicyMin = ReferenceBasedDiscovery, |
|
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
450 DiscoveryPolicyMax = ReferentBasedDiscovery |
| 0 | 451 }; |
| 452 | |
| 453 static void init_statics(); | |
| 454 | |
| 455 public: | |
| 456 // get and set "is_alive_non_header" field | |
| 457 BoolObjectClosure* is_alive_non_header() { | |
| 458 return _is_alive_non_header; | |
| 459 } | |
| 460 void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) { | |
| 461 _is_alive_non_header = is_alive_non_header; | |
| 462 } | |
| 463 | |
| 464 // get and set span | |
| 465 MemRegion span() { return _span; } | |
| 466 void set_span(MemRegion span) { _span = span; } | |
| 467 | |
| 468 // start and stop weak ref discovery | |
|
3992
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
469 void enable_discovery(bool verify_disabled, bool check_no_refs); |
| 0 | 470 void disable_discovery() { _discovering_refs = false; } |
| 471 bool discovery_enabled() { return _discovering_refs; } | |
| 472 | |
| 473 // whether discovery is atomic wrt other collectors | |
| 474 bool discovery_is_atomic() const { return _discovery_is_atomic; } | |
| 475 void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; } | |
| 476 | |
|
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
477 // whether the JDK in which we are embedded is a pre-4965777 JDK, |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
478 // and thus whether or not it uses the discovered field to chain |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
479 // the entries in the pending list. |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
480 static bool pending_list_uses_discovered_field() { |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
481 return _pending_list_uses_discovered_field; |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
482 } |
|
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
483 |
| 0 | 484 // whether discovery is done by multiple threads same-old-timeously |
| 485 bool discovery_is_mt() const { return _discovery_is_mt; } | |
| 486 void set_mt_discovery(bool mt) { _discovery_is_mt = mt; } | |
| 487 | |
| 488 // Whether we are in a phase when _processing_ is MT. | |
| 489 bool processing_is_mt() const { return _processing_is_mt; } | |
| 490 void set_mt_processing(bool mt) { _processing_is_mt = mt; } | |
| 491 | |
| 492 // whether all enqueuing of weak references is complete | |
| 493 bool enqueuing_is_done() { return _enqueuing_is_done; } | |
| 494 void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; } | |
| 495 | |
| 496 // iterate over oops | |
| 497 void weak_oops_do(OopClosure* f); // weak roots | |
| 498 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
499 // Balance each of the discovered lists. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
500 void balance_all_queues(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
501 void verify_list(DiscoveredList& ref_list); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
502 |
| 0 | 503 // Discover a Reference object, using appropriate discovery criteria |
| 504 bool discover_reference(oop obj, ReferenceType rt); | |
| 505 | |
| 506 // Process references found during GC (called by the garbage collector) | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
507 void process_discovered_references(BoolObjectClosure* is_alive, |
| 0 | 508 OopClosure* keep_alive, |
| 509 VoidClosure* complete_gc, | |
| 510 AbstractRefProcTaskExecutor* task_executor); | |
| 511 | |
| 512 public: | |
| 513 // Enqueue references at end of GC (called by the garbage collector) | |
| 514 bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL); | |
| 515 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
516 // If a discovery is in process that is being superceded, abandon it: all |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
517 // the discovered lists will be empty, and all the objects on them will |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
518 // have NULL discovered fields. Must be called only at a safepoint. |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
519 void abandon_partial_discovery(); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
520 |
| 0 | 521 // debugging |
| 522 void verify_no_references_recorded() PRODUCT_RETURN; | |
|
1995
8df09fb45352
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
1972
diff
changeset
|
523 void verify_referent(oop obj) PRODUCT_RETURN; |
| 0 | 524 |
| 525 // clear the discovered lists (unlinking each entry). | |
| 526 void clear_discovered_references() PRODUCT_RETURN; | |
| 527 }; | |
| 528 | |
| 529 // A utility class to disable reference discovery in | |
| 530 // the scope which contains it, for given ReferenceProcessor. | |
| 531 class NoRefDiscovery: StackObj { | |
| 532 private: | |
| 533 ReferenceProcessor* _rp; | |
| 534 bool _was_discovering_refs; | |
| 535 public: | |
| 536 NoRefDiscovery(ReferenceProcessor* rp) : _rp(rp) { | |
|
1789
a83b0246bb77
6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall
twisti
parents:
1552
diff
changeset
|
537 _was_discovering_refs = _rp->discovery_enabled(); |
|
a83b0246bb77
6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall
twisti
parents:
1552
diff
changeset
|
538 if (_was_discovering_refs) { |
| 0 | 539 _rp->disable_discovery(); |
| 540 } | |
| 541 } | |
| 542 | |
| 543 ~NoRefDiscovery() { | |
| 544 if (_was_discovering_refs) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
545 _rp->enable_discovery(true /*verify_disabled*/, false /*check_no_refs*/); |
| 0 | 546 } |
| 547 } | |
| 548 }; | |
| 549 | |
| 550 | |
| 551 // A utility class to temporarily mutate the span of the | |
| 552 // given ReferenceProcessor in the scope that contains it. | |
| 553 class ReferenceProcessorSpanMutator: StackObj { | |
| 554 private: | |
| 555 ReferenceProcessor* _rp; | |
| 556 MemRegion _saved_span; | |
| 557 | |
| 558 public: | |
| 559 ReferenceProcessorSpanMutator(ReferenceProcessor* rp, | |
| 560 MemRegion span): | |
| 561 _rp(rp) { | |
| 562 _saved_span = _rp->span(); | |
| 563 _rp->set_span(span); | |
| 564 } | |
| 565 | |
| 566 ~ReferenceProcessorSpanMutator() { | |
| 567 _rp->set_span(_saved_span); | |
| 568 } | |
| 569 }; | |
| 570 | |
| 571 // A utility class to temporarily change the MT'ness of | |
| 572 // reference discovery for the given ReferenceProcessor | |
| 573 // in the scope that contains it. | |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
574 class ReferenceProcessorMTDiscoveryMutator: StackObj { |
| 0 | 575 private: |
| 576 ReferenceProcessor* _rp; | |
| 577 bool _saved_mt; | |
| 578 | |
| 579 public: | |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
580 ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp, |
|
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
581 bool mt): |
| 0 | 582 _rp(rp) { |
| 583 _saved_mt = _rp->discovery_is_mt(); | |
| 584 _rp->set_mt_discovery(mt); | |
| 585 } | |
| 586 | |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
587 ~ReferenceProcessorMTDiscoveryMutator() { |
| 0 | 588 _rp->set_mt_discovery(_saved_mt); |
| 589 } | |
| 590 }; | |
| 591 | |
| 592 | |
| 593 // A utility class to temporarily change the disposition | |
| 594 // of the "is_alive_non_header" closure field of the | |
| 595 // given ReferenceProcessor in the scope that contains it. | |
| 596 class ReferenceProcessorIsAliveMutator: StackObj { | |
| 597 private: | |
| 598 ReferenceProcessor* _rp; | |
| 599 BoolObjectClosure* _saved_cl; | |
| 600 | |
| 601 public: | |
| 602 ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp, | |
| 603 BoolObjectClosure* cl): | |
| 604 _rp(rp) { | |
| 605 _saved_cl = _rp->is_alive_non_header(); | |
| 606 _rp->set_is_alive_non_header(cl); | |
| 607 } | |
| 608 | |
| 609 ~ReferenceProcessorIsAliveMutator() { | |
| 610 _rp->set_is_alive_non_header(_saved_cl); | |
| 611 } | |
| 612 }; | |
| 613 | |
| 614 // A utility class to temporarily change the disposition | |
| 615 // of the "discovery_is_atomic" field of the | |
| 616 // given ReferenceProcessor in the scope that contains it. | |
| 617 class ReferenceProcessorAtomicMutator: StackObj { | |
| 618 private: | |
| 619 ReferenceProcessor* _rp; | |
| 620 bool _saved_atomic_discovery; | |
| 621 | |
| 622 public: | |
| 623 ReferenceProcessorAtomicMutator(ReferenceProcessor* rp, | |
| 624 bool atomic): | |
| 625 _rp(rp) { | |
| 626 _saved_atomic_discovery = _rp->discovery_is_atomic(); | |
| 627 _rp->set_atomic_discovery(atomic); | |
| 628 } | |
| 629 | |
| 630 ~ReferenceProcessorAtomicMutator() { | |
| 631 _rp->set_atomic_discovery(_saved_atomic_discovery); | |
| 632 } | |
| 633 }; | |
| 634 | |
| 635 | |
| 636 // A utility class to temporarily change the MT processing | |
| 637 // disposition of the given ReferenceProcessor instance | |
| 638 // in the scope that contains it. | |
| 639 class ReferenceProcessorMTProcMutator: StackObj { | |
| 640 private: | |
| 641 ReferenceProcessor* _rp; | |
| 642 bool _saved_mt; | |
| 643 | |
| 644 public: | |
| 645 ReferenceProcessorMTProcMutator(ReferenceProcessor* rp, | |
| 646 bool mt): | |
| 647 _rp(rp) { | |
| 648 _saved_mt = _rp->processing_is_mt(); | |
| 649 _rp->set_mt_processing(mt); | |
| 650 } | |
| 651 | |
| 652 ~ReferenceProcessorMTProcMutator() { | |
| 653 _rp->set_mt_processing(_saved_mt); | |
| 654 } | |
| 655 }; | |
| 656 | |
| 657 | |
| 658 // This class is an interface used to implement task execution for the | |
| 659 // reference processing. | |
| 660 class AbstractRefProcTaskExecutor { | |
| 661 public: | |
| 662 | |
| 663 // Abstract tasks to execute. | |
| 664 class ProcessTask; | |
| 665 class EnqueueTask; | |
| 666 | |
| 667 // Executes a task using worker threads. | |
| 668 virtual void execute(ProcessTask& task) = 0; | |
| 669 virtual void execute(EnqueueTask& task) = 0; | |
| 670 | |
| 671 // Switch to single threaded mode. | |
| 672 virtual void set_single_threaded_mode() { }; | |
| 673 }; | |
| 674 | |
| 675 // Abstract reference processing task to execute. | |
| 676 class AbstractRefProcTaskExecutor::ProcessTask { | |
| 677 protected: | |
| 678 ProcessTask(ReferenceProcessor& ref_processor, | |
| 679 DiscoveredList refs_lists[], | |
| 680 bool marks_oops_alive) | |
| 681 : _ref_processor(ref_processor), | |
| 682 _refs_lists(refs_lists), | |
| 683 _marks_oops_alive(marks_oops_alive) | |
| 684 { } | |
| 685 | |
| 686 public: | |
| 687 virtual void work(unsigned int work_id, BoolObjectClosure& is_alive, | |
| 688 OopClosure& keep_alive, | |
| 689 VoidClosure& complete_gc) = 0; | |
| 690 | |
| 691 // Returns true if a task marks some oops as alive. | |
| 692 bool marks_oops_alive() const | |
| 693 { return _marks_oops_alive; } | |
| 694 | |
| 695 protected: | |
| 696 ReferenceProcessor& _ref_processor; | |
| 697 DiscoveredList* _refs_lists; | |
| 698 const bool _marks_oops_alive; | |
| 699 }; | |
| 700 | |
| 701 // Abstract reference processing task to execute. | |
| 702 class AbstractRefProcTaskExecutor::EnqueueTask { | |
| 703 protected: | |
| 704 EnqueueTask(ReferenceProcessor& ref_processor, | |
| 705 DiscoveredList refs_lists[], | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
706 HeapWord* pending_list_addr, |
| 0 | 707 int n_queues) |
| 708 : _ref_processor(ref_processor), | |
| 709 _refs_lists(refs_lists), | |
| 710 _pending_list_addr(pending_list_addr), | |
| 711 _n_queues(n_queues) | |
| 712 { } | |
| 713 | |
| 714 public: | |
| 715 virtual void work(unsigned int work_id) = 0; | |
| 716 | |
| 717 protected: | |
| 718 ReferenceProcessor& _ref_processor; | |
| 719 DiscoveredList* _refs_lists; | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
720 HeapWord* _pending_list_addr; |
| 0 | 721 int _n_queues; |
| 722 }; | |
| 1972 | 723 |
| 724 #endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |