Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp @ 1019:035d2e036a9b
6885041: G1: inconsistent thread dump
Summary: When G1 is enabled, thread dumps are inconsistent as the info for some of the G1 threads is not formatted properly.
Reviewed-by: ysr, johnc
author | tonyp |
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date | Fri, 02 Oct 2009 16:12:07 -0400 |
parents | 4f360ec815ba |
children | fa357420e7d2 |
rev | line source |
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342 | 1 /* |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class FreeIdSet; | |
26 | |
27 // A closure class for processing card table entries. Note that we don't | |
28 // require these closure objects to be stack-allocated. | |
29 class CardTableEntryClosure: public CHeapObj { | |
30 public: | |
31 // Process the card whose card table entry is "card_ptr". If returns | |
32 // "false", terminate the iteration early. | |
33 virtual bool do_card_ptr(jbyte* card_ptr, int worker_i = 0) = 0; | |
34 }; | |
35 | |
36 // A ptrQueue whose elements are "oops", pointers to object heads. | |
37 class DirtyCardQueue: public PtrQueue { | |
38 public: | |
39 DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) : | |
40 PtrQueue(qset_, perm) | |
41 { | |
42 // Dirty card queues are always active. | |
43 _active = true; | |
44 } | |
45 // Apply the closure to all elements, and reset the index to make the | |
46 // buffer empty. If a closure application returns "false", return | |
47 // "false" immediately, halting the iteration. If "consume" is true, | |
48 // deletes processed entries from logs. | |
49 bool apply_closure(CardTableEntryClosure* cl, | |
50 bool consume = true, | |
51 size_t worker_i = 0); | |
52 | |
53 // Apply the closure to all elements of "buf", down to "index" | |
54 // (inclusive.) If returns "false", then a closure application returned | |
55 // "false", and we return immediately. If "consume" is true, entries are | |
56 // set to NULL as they are processed, so they will not be processed again | |
57 // later. | |
58 static bool apply_closure_to_buffer(CardTableEntryClosure* cl, | |
59 void** buf, size_t index, size_t sz, | |
60 bool consume = true, | |
61 int worker_i = 0); | |
62 void **get_buf() { return _buf;} | |
63 void set_buf(void **buf) {_buf = buf;} | |
64 size_t get_index() { return _index;} | |
65 void reinitialize() { _buf = 0; _sz = 0; _index = 0;} | |
66 }; | |
67 | |
68 | |
69 | |
70 class DirtyCardQueueSet: public PtrQueueSet { | |
71 CardTableEntryClosure* _closure; | |
72 | |
73 DirtyCardQueue _shared_dirty_card_queue; | |
74 | |
75 // Override. | |
76 bool mut_process_buffer(void** buf); | |
77 | |
78 // Protected by the _cbl_mon. | |
79 FreeIdSet* _free_ids; | |
80 | |
81 // The number of completed buffers processed by mutator and rs thread, | |
82 // respectively. | |
83 jint _processed_buffers_mut; | |
84 jint _processed_buffers_rs_thread; | |
85 | |
86 public: | |
87 DirtyCardQueueSet(); | |
88 | |
89 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
90 int max_completed_queue = 0, | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
342
diff
changeset
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91 Mutex* lock = NULL, PtrQueueSet* fl_owner = NULL); |
342 | 92 |
93 // The number of parallel ids that can be claimed to allow collector or | |
94 // mutator threads to do card-processing work. | |
95 static size_t num_par_ids(); | |
96 | |
97 static void handle_zero_index_for_thread(JavaThread* t); | |
98 | |
99 // Register "blk" as "the closure" for all queues. Only one such closure | |
100 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
101 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
102 // applies it to partially-filled buffers (the latter should only be done | |
103 // with the world stopped). | |
104 void set_closure(CardTableEntryClosure* closure); | |
105 | |
106 // If there is a registered closure for buffers, apply it to all entries | |
107 // in all currently-active buffers. This should only be applied at a | |
108 // safepoint. (Currently must not be called in parallel; this should | |
109 // change in the future.) If "consume" is true, processed entries are | |
110 // discarded. | |
111 void iterate_closure_all_threads(bool consume = true, | |
112 size_t worker_i = 0); | |
113 | |
114 // If there exists some completed buffer, pop it, then apply the | |
115 // registered closure to all its elements, nulling out those elements | |
116 // processed. If all elements are processed, returns "true". If no | |
117 // completed buffers exist, returns false. If a completed buffer exists, | |
118 // but is only partially completed before a "yield" happens, the | |
119 // partially completed buffer (with its processed elements set to NULL) | |
120 // is returned to the completed buffer set, and this call returns false. | |
121 bool apply_closure_to_completed_buffer(int worker_i = 0, | |
122 int stop_at = 0, | |
123 bool with_CAS = false); | |
124 bool apply_closure_to_completed_buffer_helper(int worker_i, | |
125 CompletedBufferNode* nd); | |
126 | |
127 CompletedBufferNode* get_completed_buffer_CAS(); | |
128 CompletedBufferNode* get_completed_buffer_lock(int stop_at); | |
129 // Applies the current closure to all completed buffers, | |
130 // non-consumptively. | |
131 void apply_closure_to_all_completed_buffers(); | |
132 | |
133 DirtyCardQueue* shared_dirty_card_queue() { | |
134 return &_shared_dirty_card_queue; | |
135 } | |
136 | |
137 // If a full collection is happening, reset partial logs, and ignore | |
138 // completed ones: the full collection will make them all irrelevant. | |
139 void abandon_logs(); | |
140 | |
141 // If any threads have partial logs, add them to the global list of logs. | |
142 void concatenate_logs(); | |
143 void clear_n_completed_buffers() { _n_completed_buffers = 0;} | |
144 | |
145 jint processed_buffers_mut() { | |
146 return _processed_buffers_mut; | |
147 } | |
148 jint processed_buffers_rs_thread() { | |
149 return _processed_buffers_rs_thread; | |
150 } | |
151 | |
152 }; |