Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/referenceProcessor.hpp @ 22298:c28cb37b2e1d
Rename JVMCI to INCLUDE_JVMCI.
author | twisti |
---|---|
date | Wed, 22 Jul 2015 08:56:03 -0700 |
parents | 7848fc12602b |
children |
rev | line source |
---|---|
0 | 1 /* |
10405 | 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 * | |
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 | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17976
diff
changeset
|
28 #include "gc_implementation/shared/gcTrace.hpp" |
1972 | 29 #include "memory/referencePolicy.hpp" |
10405 | 30 #include "memory/referenceProcessorStats.hpp" |
31 #include "memory/referenceType.hpp" | |
1972 | 32 #include "oops/instanceRefKlass.hpp" |
33 | |
10405 | 34 class GCTimer; |
35 | |
0 | 36 // ReferenceProcessor class encapsulates the per-"collector" processing |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
37 // of java.lang.Reference objects for GC. The interface is useful for supporting |
0 | 38 // a generational abstraction, in particular when there are multiple |
39 // generations that are being independently collected -- possibly | |
40 // concurrently and/or incrementally. Note, however, that the | |
41 // ReferenceProcessor class abstracts away from a generational setting | |
42 // by using only a heap interval (called "span" below), thus allowing | |
43 // its use in a straightforward manner in a general, non-generational | |
44 // setting. | |
45 // | |
46 // The basic idea is that each ReferenceProcessor object concerns | |
47 // itself with ("weak") reference processing in a specific "span" | |
48 // of the heap of interest to a specific collector. Currently, | |
49 // the span is a convex interval of the heap, but, efficiency | |
50 // apart, there seems to be no reason it couldn't be extended | |
51 // (with appropriate modifications) to any "non-convex interval". | |
52 | |
53 // forward references | |
54 class ReferencePolicy; | |
55 class AbstractRefProcTaskExecutor; | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
56 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
57 // List of discovered references. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
58 class DiscoveredList { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
59 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
60 DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
61 oop head() const { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
62 return UseCompressedOops ? oopDesc::decode_heap_oop(_compressed_head) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
63 _oop_head; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
64 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
65 HeapWord* adr_head() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
66 return UseCompressedOops ? (HeapWord*)&_compressed_head : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
67 (HeapWord*)&_oop_head; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
68 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
69 void set_head(oop o) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
70 if (UseCompressedOops) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
71 // Must compress the head ptr. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
72 _compressed_head = oopDesc::encode_heap_oop(o); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
73 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
74 _oop_head = o; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
75 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
76 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
77 bool is_empty() const { return head() == NULL; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
78 size_t length() { return _len; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
79 void set_length(size_t len) { _len = len; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
80 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
|
81 void dec_length(size_t dec) { _len -= dec; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
82 private: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
83 // Set value depending on UseCompressedOops. This could be a template class |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
84 // 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
|
85 oop _oop_head; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
86 narrowOop _compressed_head; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
87 size_t _len; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
88 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
89 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
90 // Iterator for the list of discovered references. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
91 class DiscoveredListIterator { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
92 private: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
93 DiscoveredList& _refs_list; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
94 HeapWord* _prev_next; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
95 oop _prev; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
96 oop _ref; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
97 HeapWord* _discovered_addr; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
98 oop _next; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
99 HeapWord* _referent_addr; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
100 oop _referent; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
101 OopClosure* _keep_alive; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
102 BoolObjectClosure* _is_alive; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
103 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
104 DEBUG_ONLY( |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
105 oop _first_seen; // cyclic linked list check |
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 NOT_PRODUCT( |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
109 size_t _processed; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
110 size_t _removed; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
111 ) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
112 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
113 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
114 inline DiscoveredListIterator(DiscoveredList& refs_list, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
115 OopClosure* keep_alive, |
17976
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
17748
diff
changeset
|
116 BoolObjectClosure* is_alive): |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
117 _refs_list(refs_list), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
118 _prev_next(refs_list.adr_head()), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
119 _prev(NULL), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
120 _ref(refs_list.head()), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
121 #ifdef ASSERT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
122 _first_seen(refs_list.head()), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
123 #endif |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
124 #ifndef PRODUCT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
125 _processed(0), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
126 _removed(0), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
127 #endif |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
128 _next(NULL), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
129 _keep_alive(keep_alive), |
17976
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
17748
diff
changeset
|
130 _is_alive(is_alive) |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
131 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
132 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
133 // End Of List. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
134 inline bool has_next() const { return _ref != NULL; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
135 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
136 // Get oop to the Reference object. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
137 inline oop obj() const { return _ref; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
138 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
139 // Get oop to the referent object. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
140 inline oop referent() const { return _referent; } |
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 // Returns true if referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
143 inline bool is_referent_alive() const { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
144 return _is_alive->do_object_b(_referent); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
145 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
146 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
147 // Loads data for the current reference. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
148 // 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
|
149 // of a NULL referent in the discovered Reference object. This typically |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
150 // 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
|
151 // discovery concurrently, or interleaved, with mutator execution. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
152 void load_ptrs(DEBUG_ONLY(bool allow_null_referent)); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
153 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
154 // Move to the next discovered reference. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
155 inline void next() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
156 _prev_next = _discovered_addr; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
157 _prev = _ref; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
158 move_to_next(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
159 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
160 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
161 // Remove the current reference from the list |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
162 void remove(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
163 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
164 // Make the Reference object active again. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
165 void make_active(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
166 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
167 // Make the referent alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
168 inline void make_referent_alive() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
169 if (UseCompressedOops) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
170 _keep_alive->do_oop((narrowOop*)_referent_addr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
171 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
172 _keep_alive->do_oop((oop*)_referent_addr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
173 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
174 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
175 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
176 // Update the discovered field. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
177 inline void update_discovered() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
178 // First _prev_next ref actually points into DiscoveredList (gross). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
179 if (UseCompressedOops) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
180 if (!oopDesc::is_null(*(narrowOop*)_prev_next)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
181 _keep_alive->do_oop((narrowOop*)_prev_next); |
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 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
184 if (!oopDesc::is_null(*(oop*)_prev_next)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
185 _keep_alive->do_oop((oop*)_prev_next); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
186 } |
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 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
189 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
190 // NULL out referent pointer. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
191 void clear_referent(); |
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 // Statistics |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
194 NOT_PRODUCT( |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
195 inline size_t processed() const { return _processed; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
196 inline size_t removed() const { return _removed; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
197 ) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
198 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
199 inline void move_to_next() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
200 if (_ref == _next) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
201 // End of the list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
202 _ref = NULL; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
203 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
204 _ref = _next; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
205 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
206 assert(_ref != _first_seen, "cyclic ref_list found"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
207 NOT_PRODUCT(_processed++); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
208 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
209 }; |
0 | 210 |
6197 | 211 class ReferenceProcessor : public CHeapObj<mtGC> { |
10405 | 212 |
213 private: | |
214 size_t total_count(DiscoveredList lists[]); | |
215 | |
0 | 216 protected: |
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
217 // Compatibility with pre-4965777 JDK's |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
218 static bool _pending_list_uses_discovered_field; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
219 |
3992
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
220 // The SoftReference master timestamp clock |
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
221 static jlong _soft_ref_timestamp_clock; |
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
222 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
223 MemRegion _span; // (right-open) interval of heap |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
224 // subject to wkref discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
225 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
226 bool _discovering_refs; // true when discovery enabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
227 bool _discovery_is_atomic; // if discovery is atomic wrt |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
228 // other collectors in configuration |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
229 bool _discovery_is_mt; // true if reference discovery is MT. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
230 |
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; | |
20755 | 267 DiscoveredList* _discoveredCleanerRefs; |
0 | 268 |
269 public: | |
20755 | 270 static int number_of_subclasses_of_ref() { return (REF_CLEANER - REF_OTHER); } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
271 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
272 uint num_q() { return _num_q; } |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
273 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
|
274 void set_active_mt_degree(uint v) { _num_q = v; } |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
275 |
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
276 DiscoveredList* discovered_refs() { return _discovered_refs; } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
277 |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
278 ReferencePolicy* setup_policy(bool always_clear) { |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
279 _current_soft_ref_policy = always_clear ? |
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
280 _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
|
281 _current_soft_ref_policy->setup(); // snapshot the policy threshold |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
282 return _current_soft_ref_policy; |
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
283 } |
0 | 284 |
285 // Process references with a certain reachability level. | |
10405 | 286 size_t process_discovered_reflist(DiscoveredList refs_lists[], |
287 ReferencePolicy* policy, | |
288 bool clear_referent, | |
289 BoolObjectClosure* is_alive, | |
290 OopClosure* keep_alive, | |
291 VoidClosure* complete_gc, | |
292 AbstractRefProcTaskExecutor* task_executor); | |
0 | 293 |
294 void process_phaseJNI(BoolObjectClosure* is_alive, | |
295 OopClosure* keep_alive, | |
296 VoidClosure* complete_gc); | |
297 | |
298 // Work methods used by the method process_discovered_reflist | |
299 // Phase1: keep alive all those referents that are otherwise | |
300 // 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
|
301 void process_phase1(DiscoveredList& refs_list, |
0 | 302 ReferencePolicy* policy, |
303 BoolObjectClosure* is_alive, | |
304 OopClosure* keep_alive, | |
305 VoidClosure* complete_gc); | |
306 // Phase2: remove all those references whose referents are | |
307 // reachable. | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
308 inline void process_phase2(DiscoveredList& refs_list, |
0 | 309 BoolObjectClosure* is_alive, |
310 OopClosure* keep_alive, | |
311 VoidClosure* complete_gc) { | |
312 if (discovery_is_atomic()) { | |
313 // 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
|
314 pp2_work(refs_list, is_alive, keep_alive); |
0 | 315 } else { |
316 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
|
317 pp2_work_concurrent_discovery(refs_list, is_alive, |
0 | 318 keep_alive, complete_gc); |
319 } | |
320 } | |
321 // 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
|
322 void pp2_work(DiscoveredList& refs_list, |
0 | 323 BoolObjectClosure* is_alive, |
324 OopClosure* keep_alive); | |
325 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
|
326 DiscoveredList& refs_list, |
0 | 327 BoolObjectClosure* is_alive, |
328 OopClosure* keep_alive, | |
329 VoidClosure* complete_gc); | |
330 // Phase3: process the referents by either clearing them | |
331 // 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
|
332 void process_phase3(DiscoveredList& refs_list, |
0 | 333 bool clear_referent, |
334 BoolObjectClosure* is_alive, | |
335 OopClosure* keep_alive, | |
336 VoidClosure* complete_gc); | |
337 | |
338 // 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
|
339 void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr); |
0 | 340 |
341 // "Preclean" all the discovered reference lists | |
342 // by removing references with strongly reachable referents. | |
343 // The first argument is a predicate on an oop that indicates | |
344 // its (strong) reachability and the second is a closure that | |
345 // may be used to incrementalize or abort the precleaning process. | |
346 // The caller is responsible for taking care of potential | |
347 // interference with concurrent operations on these lists | |
348 // (or predicates involved) by other threads. Currently | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
349 // only used by the CMS collector. |
0 | 350 void preclean_discovered_references(BoolObjectClosure* is_alive, |
351 OopClosure* keep_alive, | |
352 VoidClosure* complete_gc, | |
10405 | 353 YieldClosure* yield, |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17976
diff
changeset
|
354 GCTimer* gc_timer, |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17976
diff
changeset
|
355 GCId gc_id); |
0 | 356 |
357 // Delete entries in the discovered lists that have | |
358 // either a null referent or are not active. Such | |
359 // Reference objects can result from the clearing | |
360 // or enqueueing of Reference objects concurrent | |
361 // with their discovery by a (concurrent) collector. | |
362 // For a definition of "active" see java.lang.ref.Reference; | |
363 // Refs are born active, become inactive when enqueued, | |
364 // and never become active again. The state of being | |
365 // active is encoded as follows: A Ref is active | |
366 // if and only if its "next" field is NULL. | |
367 void clean_up_discovered_references(); | |
368 void clean_up_discovered_reflist(DiscoveredList& refs_list); | |
369 | |
370 // Returns the name of the discovered reference list | |
371 // occupying the i / _num_q slot. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
372 const char* list_name(uint i); |
0 | 373 |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
374 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
|
375 |
0 | 376 protected: |
377 // "Preclean" the given discovered reference list | |
378 // by removing references with strongly reachable referents. | |
379 // Currently used in support of CMS only. | |
380 void preclean_discovered_reflist(DiscoveredList& refs_list, | |
381 BoolObjectClosure* is_alive, | |
382 OopClosure* keep_alive, | |
383 VoidClosure* complete_gc, | |
384 YieldClosure* yield); | |
385 | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
386 // 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
|
387 uint next_id() { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
388 uint id = _next_id; |
0 | 389 if (++_next_id == _num_q) { |
390 _next_id = 0; | |
391 } | |
392 return id; | |
393 } | |
394 DiscoveredList* get_discovered_list(ReferenceType rt); | |
395 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
|
396 HeapWord* discovered_addr); |
0 | 397 void verify_ok_to_handle_reflists() PRODUCT_RETURN; |
398 | |
3915
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
2369
diff
changeset
|
399 void clear_discovered_references(DiscoveredList& refs_list); |
0 | 400 void abandon_partial_discovered_list(DiscoveredList& refs_list); |
401 | |
402 // Calculate the number of jni handles. | |
403 unsigned int count_jni_refs(); | |
404 | |
405 // Balances reference queues. | |
406 void balance_queues(DiscoveredList ref_lists[]); | |
407 | |
408 // Update (advance) the soft ref master clock field. | |
409 void update_soft_ref_master_clock(); | |
410 | |
411 public: | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
412 // Default parameters give you a vanilla reference processor. |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
413 ReferenceProcessor(MemRegion span, |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
414 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
|
415 bool mt_discovery = false, uint mt_discovery_degree = 1, |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
416 bool atomic_discovery = true, |
17976
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
17748
diff
changeset
|
417 BoolObjectClosure* is_alive_non_header = NULL); |
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
418 |
0 | 419 // RefDiscoveryPolicy values |
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
420 enum DiscoveryPolicy { |
0 | 421 ReferenceBasedDiscovery = 0, |
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
422 ReferentBasedDiscovery = 1, |
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
423 DiscoveryPolicyMin = ReferenceBasedDiscovery, |
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
424 DiscoveryPolicyMax = ReferentBasedDiscovery |
0 | 425 }; |
426 | |
427 static void init_statics(); | |
428 | |
429 public: | |
430 // get and set "is_alive_non_header" field | |
431 BoolObjectClosure* is_alive_non_header() { | |
432 return _is_alive_non_header; | |
433 } | |
434 void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) { | |
435 _is_alive_non_header = is_alive_non_header; | |
436 } | |
437 | |
438 // get and set span | |
439 MemRegion span() { return _span; } | |
440 void set_span(MemRegion span) { _span = span; } | |
441 | |
442 // start and stop weak ref discovery | |
3992
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
443 void enable_discovery(bool verify_disabled, bool check_no_refs); |
0 | 444 void disable_discovery() { _discovering_refs = false; } |
445 bool discovery_enabled() { return _discovering_refs; } | |
446 | |
447 // whether discovery is atomic wrt other collectors | |
448 bool discovery_is_atomic() const { return _discovery_is_atomic; } | |
449 void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; } | |
450 | |
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
451 // 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
|
452 // 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
|
453 // the entries in the pending list. |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
454 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
|
455 return _pending_list_uses_discovered_field; |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
456 } |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
457 |
0 | 458 // whether discovery is done by multiple threads same-old-timeously |
459 bool discovery_is_mt() const { return _discovery_is_mt; } | |
460 void set_mt_discovery(bool mt) { _discovery_is_mt = mt; } | |
461 | |
462 // Whether we are in a phase when _processing_ is MT. | |
463 bool processing_is_mt() const { return _processing_is_mt; } | |
464 void set_mt_processing(bool mt) { _processing_is_mt = mt; } | |
465 | |
466 // whether all enqueuing of weak references is complete | |
467 bool enqueuing_is_done() { return _enqueuing_is_done; } | |
468 void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; } | |
469 | |
470 // iterate over oops | |
471 void weak_oops_do(OopClosure* f); // weak roots | |
472 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
473 // Balance each of the discovered lists. |
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
474 void balance_all_queues(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
475 void verify_list(DiscoveredList& ref_list); |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
476 |
0 | 477 // Discover a Reference object, using appropriate discovery criteria |
478 bool discover_reference(oop obj, ReferenceType rt); | |
479 | |
480 // Process references found during GC (called by the garbage collector) | |
10405 | 481 ReferenceProcessorStats |
482 process_discovered_references(BoolObjectClosure* is_alive, | |
483 OopClosure* keep_alive, | |
484 VoidClosure* complete_gc, | |
485 AbstractRefProcTaskExecutor* task_executor, | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17976
diff
changeset
|
486 GCTimer *gc_timer, |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17976
diff
changeset
|
487 GCId gc_id); |
0 | 488 |
489 // Enqueue references at end of GC (called by the garbage collector) | |
490 bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL); | |
491 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
492 // 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
|
493 // 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
|
494 // 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
|
495 void abandon_partial_discovery(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
496 |
0 | 497 // debugging |
498 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
|
499 void verify_referent(oop obj) PRODUCT_RETURN; |
0 | 500 |
501 // clear the discovered lists (unlinking each entry). | |
502 void clear_discovered_references() PRODUCT_RETURN; | |
503 }; | |
504 | |
505 // A utility class to disable reference discovery in | |
506 // the scope which contains it, for given ReferenceProcessor. | |
507 class NoRefDiscovery: StackObj { | |
508 private: | |
509 ReferenceProcessor* _rp; | |
510 bool _was_discovering_refs; | |
511 public: | |
512 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
|
513 _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
|
514 if (_was_discovering_refs) { |
0 | 515 _rp->disable_discovery(); |
516 } | |
517 } | |
518 | |
519 ~NoRefDiscovery() { | |
520 if (_was_discovering_refs) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
521 _rp->enable_discovery(true /*verify_disabled*/, false /*check_no_refs*/); |
0 | 522 } |
523 } | |
524 }; | |
525 | |
526 | |
527 // A utility class to temporarily mutate the span of the | |
528 // given ReferenceProcessor in the scope that contains it. | |
529 class ReferenceProcessorSpanMutator: StackObj { | |
530 private: | |
531 ReferenceProcessor* _rp; | |
532 MemRegion _saved_span; | |
533 | |
534 public: | |
535 ReferenceProcessorSpanMutator(ReferenceProcessor* rp, | |
536 MemRegion span): | |
537 _rp(rp) { | |
538 _saved_span = _rp->span(); | |
539 _rp->set_span(span); | |
540 } | |
541 | |
542 ~ReferenceProcessorSpanMutator() { | |
543 _rp->set_span(_saved_span); | |
544 } | |
545 }; | |
546 | |
547 // A utility class to temporarily change the MT'ness of | |
548 // reference discovery for the given ReferenceProcessor | |
549 // in the scope that contains it. | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
550 class ReferenceProcessorMTDiscoveryMutator: StackObj { |
0 | 551 private: |
552 ReferenceProcessor* _rp; | |
553 bool _saved_mt; | |
554 | |
555 public: | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
556 ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp, |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
557 bool mt): |
0 | 558 _rp(rp) { |
559 _saved_mt = _rp->discovery_is_mt(); | |
560 _rp->set_mt_discovery(mt); | |
561 } | |
562 | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
563 ~ReferenceProcessorMTDiscoveryMutator() { |
0 | 564 _rp->set_mt_discovery(_saved_mt); |
565 } | |
566 }; | |
567 | |
568 | |
569 // A utility class to temporarily change the disposition | |
570 // of the "is_alive_non_header" closure field of the | |
571 // given ReferenceProcessor in the scope that contains it. | |
572 class ReferenceProcessorIsAliveMutator: StackObj { | |
573 private: | |
574 ReferenceProcessor* _rp; | |
575 BoolObjectClosure* _saved_cl; | |
576 | |
577 public: | |
578 ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp, | |
579 BoolObjectClosure* cl): | |
580 _rp(rp) { | |
581 _saved_cl = _rp->is_alive_non_header(); | |
582 _rp->set_is_alive_non_header(cl); | |
583 } | |
584 | |
585 ~ReferenceProcessorIsAliveMutator() { | |
586 _rp->set_is_alive_non_header(_saved_cl); | |
587 } | |
588 }; | |
589 | |
590 // A utility class to temporarily change the disposition | |
591 // of the "discovery_is_atomic" field of the | |
592 // given ReferenceProcessor in the scope that contains it. | |
593 class ReferenceProcessorAtomicMutator: StackObj { | |
594 private: | |
595 ReferenceProcessor* _rp; | |
596 bool _saved_atomic_discovery; | |
597 | |
598 public: | |
599 ReferenceProcessorAtomicMutator(ReferenceProcessor* rp, | |
600 bool atomic): | |
601 _rp(rp) { | |
602 _saved_atomic_discovery = _rp->discovery_is_atomic(); | |
603 _rp->set_atomic_discovery(atomic); | |
604 } | |
605 | |
606 ~ReferenceProcessorAtomicMutator() { | |
607 _rp->set_atomic_discovery(_saved_atomic_discovery); | |
608 } | |
609 }; | |
610 | |
611 | |
612 // A utility class to temporarily change the MT processing | |
613 // disposition of the given ReferenceProcessor instance | |
614 // in the scope that contains it. | |
615 class ReferenceProcessorMTProcMutator: StackObj { | |
616 private: | |
617 ReferenceProcessor* _rp; | |
618 bool _saved_mt; | |
619 | |
620 public: | |
621 ReferenceProcessorMTProcMutator(ReferenceProcessor* rp, | |
622 bool mt): | |
623 _rp(rp) { | |
624 _saved_mt = _rp->processing_is_mt(); | |
625 _rp->set_mt_processing(mt); | |
626 } | |
627 | |
628 ~ReferenceProcessorMTProcMutator() { | |
629 _rp->set_mt_processing(_saved_mt); | |
630 } | |
631 }; | |
632 | |
633 | |
634 // This class is an interface used to implement task execution for the | |
635 // reference processing. | |
636 class AbstractRefProcTaskExecutor { | |
637 public: | |
638 | |
639 // Abstract tasks to execute. | |
640 class ProcessTask; | |
641 class EnqueueTask; | |
642 | |
643 // Executes a task using worker threads. | |
644 virtual void execute(ProcessTask& task) = 0; | |
645 virtual void execute(EnqueueTask& task) = 0; | |
646 | |
647 // Switch to single threaded mode. | |
648 virtual void set_single_threaded_mode() { }; | |
649 }; | |
650 | |
651 // Abstract reference processing task to execute. | |
652 class AbstractRefProcTaskExecutor::ProcessTask { | |
653 protected: | |
654 ProcessTask(ReferenceProcessor& ref_processor, | |
655 DiscoveredList refs_lists[], | |
656 bool marks_oops_alive) | |
657 : _ref_processor(ref_processor), | |
658 _refs_lists(refs_lists), | |
659 _marks_oops_alive(marks_oops_alive) | |
660 { } | |
661 | |
662 public: | |
663 virtual void work(unsigned int work_id, BoolObjectClosure& is_alive, | |
664 OopClosure& keep_alive, | |
665 VoidClosure& complete_gc) = 0; | |
666 | |
667 // Returns true if a task marks some oops as alive. | |
668 bool marks_oops_alive() const | |
669 { return _marks_oops_alive; } | |
670 | |
671 protected: | |
672 ReferenceProcessor& _ref_processor; | |
673 DiscoveredList* _refs_lists; | |
674 const bool _marks_oops_alive; | |
675 }; | |
676 | |
677 // Abstract reference processing task to execute. | |
678 class AbstractRefProcTaskExecutor::EnqueueTask { | |
679 protected: | |
680 EnqueueTask(ReferenceProcessor& ref_processor, | |
681 DiscoveredList refs_lists[], | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
682 HeapWord* pending_list_addr, |
0 | 683 int n_queues) |
684 : _ref_processor(ref_processor), | |
685 _refs_lists(refs_lists), | |
686 _pending_list_addr(pending_list_addr), | |
687 _n_queues(n_queues) | |
688 { } | |
689 | |
690 public: | |
691 virtual void work(unsigned int work_id) = 0; | |
692 | |
693 protected: | |
694 ReferenceProcessor& _ref_processor; | |
695 DiscoveredList* _refs_lists; | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
696 HeapWord* _pending_list_addr; |
0 | 697 int _n_queues; |
698 }; | |
1972 | 699 |
700 #endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |