Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/referenceProcessor.hpp @ 8804:91bf0bdae37b
8008217: CDS: Class data sharing limits the malloc heap on Solaris
Summary: In 64bit VM move CDS archive address to 32G on all platforms using new flag SharedBaseAddress. In 32bit VM set CDS archive address to 3Gb on Linux and let other OSs pick the address.
Reviewed-by: kvn, dcubed, zgu, hseigel
author | coleenp |
---|---|
date | Wed, 20 Mar 2013 08:04:54 -0400 |
parents | da91efe96a93 |
children | ebb32c4589f3 f2110083203d |
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); | |
296 | |
297 // Work methods used by the method process_discovered_reflist | |
298 // Phase1: keep alive all those referents that are otherwise | |
299 // 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
|
300 void process_phase1(DiscoveredList& refs_list, |
0 | 301 ReferencePolicy* policy, |
302 BoolObjectClosure* is_alive, | |
303 OopClosure* keep_alive, | |
304 VoidClosure* complete_gc); | |
305 // Phase2: remove all those references whose referents are | |
306 // reachable. | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
307 inline void process_phase2(DiscoveredList& refs_list, |
0 | 308 BoolObjectClosure* is_alive, |
309 OopClosure* keep_alive, | |
310 VoidClosure* complete_gc) { | |
311 if (discovery_is_atomic()) { | |
312 // 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
|
313 pp2_work(refs_list, is_alive, keep_alive); |
0 | 314 } else { |
315 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
|
316 pp2_work_concurrent_discovery(refs_list, is_alive, |
0 | 317 keep_alive, complete_gc); |
318 } | |
319 } | |
320 // 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
|
321 void pp2_work(DiscoveredList& refs_list, |
0 | 322 BoolObjectClosure* is_alive, |
323 OopClosure* keep_alive); | |
324 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
|
325 DiscoveredList& refs_list, |
0 | 326 BoolObjectClosure* is_alive, |
327 OopClosure* keep_alive, | |
328 VoidClosure* complete_gc); | |
329 // Phase3: process the referents by either clearing them | |
330 // 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
|
331 void process_phase3(DiscoveredList& refs_list, |
0 | 332 bool clear_referent, |
333 BoolObjectClosure* is_alive, | |
334 OopClosure* keep_alive, | |
335 VoidClosure* complete_gc); | |
336 | |
337 // 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
|
338 void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr); |
0 | 339 |
340 // "Preclean" all the discovered reference lists | |
341 // by removing references with strongly reachable referents. | |
342 // The first argument is a predicate on an oop that indicates | |
343 // its (strong) reachability and the second is a closure that | |
344 // may be used to incrementalize or abort the precleaning process. | |
345 // The caller is responsible for taking care of potential | |
346 // interference with concurrent operations on these lists | |
347 // (or predicates involved) by other threads. Currently | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
348 // only used by the CMS collector. |
0 | 349 void preclean_discovered_references(BoolObjectClosure* is_alive, |
350 OopClosure* keep_alive, | |
351 VoidClosure* complete_gc, | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
352 YieldClosure* yield); |
0 | 353 |
354 // Delete entries in the discovered lists that have | |
355 // either a null referent or are not active. Such | |
356 // Reference objects can result from the clearing | |
357 // or enqueueing of Reference objects concurrent | |
358 // with their discovery by a (concurrent) collector. | |
359 // For a definition of "active" see java.lang.ref.Reference; | |
360 // Refs are born active, become inactive when enqueued, | |
361 // and never become active again. The state of being | |
362 // active is encoded as follows: A Ref is active | |
363 // if and only if its "next" field is NULL. | |
364 void clean_up_discovered_references(); | |
365 void clean_up_discovered_reflist(DiscoveredList& refs_list); | |
366 | |
367 // Returns the name of the discovered reference list | |
368 // occupying the i / _num_q slot. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
369 const char* list_name(uint i); |
0 | 370 |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
371 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
|
372 |
0 | 373 protected: |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
374 // Set the 'discovered' field of the given reference to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
375 // the given value - emitting barriers depending upon |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
376 // the value of _discovered_list_needs_barrier. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
377 void set_discovered(oop ref, oop value); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
378 |
0 | 379 // "Preclean" the given discovered reference list |
380 // by removing references with strongly reachable referents. | |
381 // Currently used in support of CMS only. | |
382 void preclean_discovered_reflist(DiscoveredList& refs_list, | |
383 BoolObjectClosure* is_alive, | |
384 OopClosure* keep_alive, | |
385 VoidClosure* complete_gc, | |
386 YieldClosure* yield); | |
387 | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
388 // 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
|
389 uint next_id() { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
390 uint id = _next_id; |
0 | 391 if (++_next_id == _num_q) { |
392 _next_id = 0; | |
393 } | |
394 return id; | |
395 } | |
396 DiscoveredList* get_discovered_list(ReferenceType rt); | |
397 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
|
398 HeapWord* discovered_addr); |
0 | 399 void verify_ok_to_handle_reflists() PRODUCT_RETURN; |
400 | |
3915
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
2369
diff
changeset
|
401 void clear_discovered_references(DiscoveredList& refs_list); |
0 | 402 void abandon_partial_discovered_list(DiscoveredList& refs_list); |
403 | |
404 // Calculate the number of jni handles. | |
405 unsigned int count_jni_refs(); | |
406 | |
407 // Balances reference queues. | |
408 void balance_queues(DiscoveredList ref_lists[]); | |
409 | |
410 // Update (advance) the soft ref master clock field. | |
411 void update_soft_ref_master_clock(); | |
412 | |
413 public: | |
414 // constructor | |
415 ReferenceProcessor(): | |
416 _span((HeapWord*)NULL, (HeapWord*)NULL), | |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
3992
diff
changeset
|
417 _discovered_refs(NULL), |
0 | 418 _discoveredSoftRefs(NULL), _discoveredWeakRefs(NULL), |
419 _discoveredFinalRefs(NULL), _discoveredPhantomRefs(NULL), | |
420 _discovering_refs(false), | |
421 _discovery_is_atomic(true), | |
422 _enqueuing_is_done(false), | |
423 _discovery_is_mt(false), | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
424 _discovered_list_needs_barrier(false), |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
425 _bs(NULL), |
0 | 426 _is_alive_non_header(NULL), |
427 _num_q(0), | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
428 _max_num_q(0), |
0 | 429 _processing_is_mt(false), |
430 _next_id(0) | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
431 { } |
0 | 432 |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
433 // Default parameters give you a vanilla reference processor. |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
434 ReferenceProcessor(MemRegion span, |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4014
diff
changeset
|
435 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
|
436 bool mt_discovery = false, uint mt_discovery_degree = 1, |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
437 bool atomic_discovery = true, |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
438 BoolObjectClosure* is_alive_non_header = NULL, |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
439 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
|
440 |
0 | 441 // RefDiscoveryPolicy values |
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
442 enum DiscoveryPolicy { |
0 | 443 ReferenceBasedDiscovery = 0, |
1244
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
444 ReferentBasedDiscovery = 1, |
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
445 DiscoveryPolicyMin = ReferenceBasedDiscovery, |
745c853ee57f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
johnc
parents:
1190
diff
changeset
|
446 DiscoveryPolicyMax = ReferentBasedDiscovery |
0 | 447 }; |
448 | |
449 static void init_statics(); | |
450 | |
451 public: | |
452 // get and set "is_alive_non_header" field | |
453 BoolObjectClosure* is_alive_non_header() { | |
454 return _is_alive_non_header; | |
455 } | |
456 void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) { | |
457 _is_alive_non_header = is_alive_non_header; | |
458 } | |
459 | |
460 // get and set span | |
461 MemRegion span() { return _span; } | |
462 void set_span(MemRegion span) { _span = span; } | |
463 | |
464 // start and stop weak ref discovery | |
3992
d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
3979
diff
changeset
|
465 void enable_discovery(bool verify_disabled, bool check_no_refs); |
0 | 466 void disable_discovery() { _discovering_refs = false; } |
467 bool discovery_enabled() { return _discovering_refs; } | |
468 | |
469 // whether discovery is atomic wrt other collectors | |
470 bool discovery_is_atomic() const { return _discovery_is_atomic; } | |
471 void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; } | |
472 | |
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
473 // 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
|
474 // 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
|
475 // the entries in the pending list. |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
476 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
|
477 return _pending_list_uses_discovered_field; |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
478 } |
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
3915
diff
changeset
|
479 |
0 | 480 // whether discovery is done by multiple threads same-old-timeously |
481 bool discovery_is_mt() const { return _discovery_is_mt; } | |
482 void set_mt_discovery(bool mt) { _discovery_is_mt = mt; } | |
483 | |
484 // Whether we are in a phase when _processing_ is MT. | |
485 bool processing_is_mt() const { return _processing_is_mt; } | |
486 void set_mt_processing(bool mt) { _processing_is_mt = mt; } | |
487 | |
488 // whether all enqueuing of weak references is complete | |
489 bool enqueuing_is_done() { return _enqueuing_is_done; } | |
490 void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; } | |
491 | |
492 // iterate over oops | |
493 void weak_oops_do(OopClosure* f); // weak roots | |
494 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
495 // Balance each of the discovered lists. |
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
496 void balance_all_queues(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
497 void verify_list(DiscoveredList& ref_list); |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
498 |
0 | 499 // Discover a Reference object, using appropriate discovery criteria |
500 bool discover_reference(oop obj, ReferenceType rt); | |
501 | |
502 // 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
|
503 void process_discovered_references(BoolObjectClosure* is_alive, |
0 | 504 OopClosure* keep_alive, |
505 VoidClosure* complete_gc, | |
506 AbstractRefProcTaskExecutor* task_executor); | |
507 | |
508 public: | |
509 // Enqueue references at end of GC (called by the garbage collector) | |
510 bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL); | |
511 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
512 // 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
|
513 // 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
|
514 // 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
|
515 void abandon_partial_discovery(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
516 |
0 | 517 // debugging |
518 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
|
519 void verify_referent(oop obj) PRODUCT_RETURN; |
0 | 520 |
521 // clear the discovered lists (unlinking each entry). | |
522 void clear_discovered_references() PRODUCT_RETURN; | |
523 }; | |
524 | |
525 // A utility class to disable reference discovery in | |
526 // the scope which contains it, for given ReferenceProcessor. | |
527 class NoRefDiscovery: StackObj { | |
528 private: | |
529 ReferenceProcessor* _rp; | |
530 bool _was_discovering_refs; | |
531 public: | |
532 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
|
533 _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
|
534 if (_was_discovering_refs) { |
0 | 535 _rp->disable_discovery(); |
536 } | |
537 } | |
538 | |
539 ~NoRefDiscovery() { | |
540 if (_was_discovering_refs) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3917
diff
changeset
|
541 _rp->enable_discovery(true /*verify_disabled*/, false /*check_no_refs*/); |
0 | 542 } |
543 } | |
544 }; | |
545 | |
546 | |
547 // A utility class to temporarily mutate the span of the | |
548 // given ReferenceProcessor in the scope that contains it. | |
549 class ReferenceProcessorSpanMutator: StackObj { | |
550 private: | |
551 ReferenceProcessor* _rp; | |
552 MemRegion _saved_span; | |
553 | |
554 public: | |
555 ReferenceProcessorSpanMutator(ReferenceProcessor* rp, | |
556 MemRegion span): | |
557 _rp(rp) { | |
558 _saved_span = _rp->span(); | |
559 _rp->set_span(span); | |
560 } | |
561 | |
562 ~ReferenceProcessorSpanMutator() { | |
563 _rp->set_span(_saved_span); | |
564 } | |
565 }; | |
566 | |
567 // A utility class to temporarily change the MT'ness of | |
568 // reference discovery for the given ReferenceProcessor | |
569 // in the scope that contains it. | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
570 class ReferenceProcessorMTDiscoveryMutator: StackObj { |
0 | 571 private: |
572 ReferenceProcessor* _rp; | |
573 bool _saved_mt; | |
574 | |
575 public: | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
576 ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp, |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
577 bool mt): |
0 | 578 _rp(rp) { |
579 _saved_mt = _rp->discovery_is_mt(); | |
580 _rp->set_mt_discovery(mt); | |
581 } | |
582 | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
1995
diff
changeset
|
583 ~ReferenceProcessorMTDiscoveryMutator() { |
0 | 584 _rp->set_mt_discovery(_saved_mt); |
585 } | |
586 }; | |
587 | |
588 | |
589 // A utility class to temporarily change the disposition | |
590 // of the "is_alive_non_header" closure field of the | |
591 // given ReferenceProcessor in the scope that contains it. | |
592 class ReferenceProcessorIsAliveMutator: StackObj { | |
593 private: | |
594 ReferenceProcessor* _rp; | |
595 BoolObjectClosure* _saved_cl; | |
596 | |
597 public: | |
598 ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp, | |
599 BoolObjectClosure* cl): | |
600 _rp(rp) { | |
601 _saved_cl = _rp->is_alive_non_header(); | |
602 _rp->set_is_alive_non_header(cl); | |
603 } | |
604 | |
605 ~ReferenceProcessorIsAliveMutator() { | |
606 _rp->set_is_alive_non_header(_saved_cl); | |
607 } | |
608 }; | |
609 | |
610 // A utility class to temporarily change the disposition | |
611 // of the "discovery_is_atomic" field of the | |
612 // given ReferenceProcessor in the scope that contains it. | |
613 class ReferenceProcessorAtomicMutator: StackObj { | |
614 private: | |
615 ReferenceProcessor* _rp; | |
616 bool _saved_atomic_discovery; | |
617 | |
618 public: | |
619 ReferenceProcessorAtomicMutator(ReferenceProcessor* rp, | |
620 bool atomic): | |
621 _rp(rp) { | |
622 _saved_atomic_discovery = _rp->discovery_is_atomic(); | |
623 _rp->set_atomic_discovery(atomic); | |
624 } | |
625 | |
626 ~ReferenceProcessorAtomicMutator() { | |
627 _rp->set_atomic_discovery(_saved_atomic_discovery); | |
628 } | |
629 }; | |
630 | |
631 | |
632 // A utility class to temporarily change the MT processing | |
633 // disposition of the given ReferenceProcessor instance | |
634 // in the scope that contains it. | |
635 class ReferenceProcessorMTProcMutator: StackObj { | |
636 private: | |
637 ReferenceProcessor* _rp; | |
638 bool _saved_mt; | |
639 | |
640 public: | |
641 ReferenceProcessorMTProcMutator(ReferenceProcessor* rp, | |
642 bool mt): | |
643 _rp(rp) { | |
644 _saved_mt = _rp->processing_is_mt(); | |
645 _rp->set_mt_processing(mt); | |
646 } | |
647 | |
648 ~ReferenceProcessorMTProcMutator() { | |
649 _rp->set_mt_processing(_saved_mt); | |
650 } | |
651 }; | |
652 | |
653 | |
654 // This class is an interface used to implement task execution for the | |
655 // reference processing. | |
656 class AbstractRefProcTaskExecutor { | |
657 public: | |
658 | |
659 // Abstract tasks to execute. | |
660 class ProcessTask; | |
661 class EnqueueTask; | |
662 | |
663 // Executes a task using worker threads. | |
664 virtual void execute(ProcessTask& task) = 0; | |
665 virtual void execute(EnqueueTask& task) = 0; | |
666 | |
667 // Switch to single threaded mode. | |
668 virtual void set_single_threaded_mode() { }; | |
669 }; | |
670 | |
671 // Abstract reference processing task to execute. | |
672 class AbstractRefProcTaskExecutor::ProcessTask { | |
673 protected: | |
674 ProcessTask(ReferenceProcessor& ref_processor, | |
675 DiscoveredList refs_lists[], | |
676 bool marks_oops_alive) | |
677 : _ref_processor(ref_processor), | |
678 _refs_lists(refs_lists), | |
679 _marks_oops_alive(marks_oops_alive) | |
680 { } | |
681 | |
682 public: | |
683 virtual void work(unsigned int work_id, BoolObjectClosure& is_alive, | |
684 OopClosure& keep_alive, | |
685 VoidClosure& complete_gc) = 0; | |
686 | |
687 // Returns true if a task marks some oops as alive. | |
688 bool marks_oops_alive() const | |
689 { return _marks_oops_alive; } | |
690 | |
691 protected: | |
692 ReferenceProcessor& _ref_processor; | |
693 DiscoveredList* _refs_lists; | |
694 const bool _marks_oops_alive; | |
695 }; | |
696 | |
697 // Abstract reference processing task to execute. | |
698 class AbstractRefProcTaskExecutor::EnqueueTask { | |
699 protected: | |
700 EnqueueTask(ReferenceProcessor& ref_processor, | |
701 DiscoveredList refs_lists[], | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
702 HeapWord* pending_list_addr, |
0 | 703 int n_queues) |
704 : _ref_processor(ref_processor), | |
705 _refs_lists(refs_lists), | |
706 _pending_list_addr(pending_list_addr), | |
707 _n_queues(n_queues) | |
708 { } | |
709 | |
710 public: | |
711 virtual void work(unsigned int work_id) = 0; | |
712 | |
713 protected: | |
714 ReferenceProcessor& _ref_processor; | |
715 DiscoveredList* _refs_lists; | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
716 HeapWord* _pending_list_addr; |
0 | 717 int _n_queues; |
718 }; | |
1972 | 719 |
720 #endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |