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annotate src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 8847586c9037 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP | |
27 | |
28 #include "gc_implementation/g1/ptrQueue.hpp" | |
29 #include "memory/allocation.hpp" | |
30 | |
342 | 31 class FreeIdSet; |
32 | |
33 // A closure class for processing card table entries. Note that we don't | |
34 // require these closure objects to be stack-allocated. | |
6197 | 35 class CardTableEntryClosure: public CHeapObj<mtGC> { |
342 | 36 public: |
37 // Process the card whose card table entry is "card_ptr". If returns | |
38 // "false", terminate the iteration early. | |
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39 virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i = 0) = 0; |
342 | 40 }; |
41 | |
42 // A ptrQueue whose elements are "oops", pointers to object heads. | |
43 class DirtyCardQueue: public PtrQueue { | |
44 public: | |
45 DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) : | |
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46 // Dirty card queues are always active, so we create them with their |
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47 // active field set to true. |
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48 PtrQueue(qset_, perm, true /* active */) { } |
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49 |
342 | 50 // Apply the closure to all elements, and reset the index to make the |
51 // buffer empty. If a closure application returns "false", return | |
52 // "false" immediately, halting the iteration. If "consume" is true, | |
53 // deletes processed entries from logs. | |
54 bool apply_closure(CardTableEntryClosure* cl, | |
55 bool consume = true, | |
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56 uint worker_i = 0); |
342 | 57 |
58 // Apply the closure to all elements of "buf", down to "index" | |
59 // (inclusive.) If returns "false", then a closure application returned | |
60 // "false", and we return immediately. If "consume" is true, entries are | |
61 // set to NULL as they are processed, so they will not be processed again | |
62 // later. | |
63 static bool apply_closure_to_buffer(CardTableEntryClosure* cl, | |
64 void** buf, size_t index, size_t sz, | |
65 bool consume = true, | |
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66 uint worker_i = 0); |
342 | 67 void **get_buf() { return _buf;} |
68 void set_buf(void **buf) {_buf = buf;} | |
69 size_t get_index() { return _index;} | |
70 void reinitialize() { _buf = 0; _sz = 0; _index = 0;} | |
71 }; | |
72 | |
73 | |
74 | |
75 class DirtyCardQueueSet: public PtrQueueSet { | |
76 CardTableEntryClosure* _closure; | |
77 | |
78 DirtyCardQueue _shared_dirty_card_queue; | |
79 | |
80 // Override. | |
81 bool mut_process_buffer(void** buf); | |
82 | |
83 // Protected by the _cbl_mon. | |
84 FreeIdSet* _free_ids; | |
85 | |
86 // The number of completed buffers processed by mutator and rs thread, | |
87 // respectively. | |
88 jint _processed_buffers_mut; | |
89 jint _processed_buffers_rs_thread; | |
90 | |
91 public: | |
1111 | 92 DirtyCardQueueSet(bool notify_when_complete = true); |
342 | 93 |
94 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 95 int process_completed_threshold, |
96 int max_completed_queue, | |
97 Mutex* lock, PtrQueueSet* fl_owner = NULL); | |
342 | 98 |
99 // The number of parallel ids that can be claimed to allow collector or | |
100 // mutator threads to do card-processing work. | |
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101 static uint num_par_ids(); |
342 | 102 |
103 static void handle_zero_index_for_thread(JavaThread* t); | |
104 | |
105 // Register "blk" as "the closure" for all queues. Only one such closure | |
106 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
107 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
108 // applies it to partially-filled buffers (the latter should only be done | |
109 // with the world stopped). | |
110 void set_closure(CardTableEntryClosure* closure); | |
111 | |
112 // If there is a registered closure for buffers, apply it to all entries | |
113 // in all currently-active buffers. This should only be applied at a | |
114 // safepoint. (Currently must not be called in parallel; this should | |
115 // change in the future.) If "consume" is true, processed entries are | |
116 // discarded. | |
117 void iterate_closure_all_threads(bool consume = true, | |
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118 uint worker_i = 0); |
342 | 119 |
120 // If there exists some completed buffer, pop it, then apply the | |
121 // registered closure to all its elements, nulling out those elements | |
122 // processed. If all elements are processed, returns "true". If no | |
123 // completed buffers exist, returns false. If a completed buffer exists, | |
124 // but is only partially completed before a "yield" happens, the | |
125 // partially completed buffer (with its processed elements set to NULL) | |
126 // is returned to the completed buffer set, and this call returns false. | |
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127 bool apply_closure_to_completed_buffer(uint worker_i = 0, |
342 | 128 int stop_at = 0, |
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129 bool during_pause = false); |
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130 |
1705 | 131 // If there exists some completed buffer, pop it, then apply the |
132 // specified closure to all its elements, nulling out those elements | |
133 // processed. If all elements are processed, returns "true". If no | |
134 // completed buffers exist, returns false. If a completed buffer exists, | |
135 // but is only partially completed before a "yield" happens, the | |
136 // partially completed buffer (with its processed elements set to NULL) | |
137 // is returned to the completed buffer set, and this call returns false. | |
138 bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl, | |
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139 uint worker_i = 0, |
1705 | 140 int stop_at = 0, |
141 bool during_pause = false); | |
142 | |
143 // Helper routine for the above. | |
144 bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl, | |
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145 uint worker_i, |
1111 | 146 BufferNode* nd); |
342 | 147 |
1111 | 148 BufferNode* get_completed_buffer(int stop_at); |
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149 |
342 | 150 // Applies the current closure to all completed buffers, |
151 // non-consumptively. | |
152 void apply_closure_to_all_completed_buffers(); | |
153 | |
154 DirtyCardQueue* shared_dirty_card_queue() { | |
155 return &_shared_dirty_card_queue; | |
156 } | |
157 | |
1705 | 158 // Deallocate any completed log buffers |
159 void clear(); | |
160 | |
342 | 161 // If a full collection is happening, reset partial logs, and ignore |
162 // completed ones: the full collection will make them all irrelevant. | |
163 void abandon_logs(); | |
164 | |
165 // If any threads have partial logs, add them to the global list of logs. | |
166 void concatenate_logs(); | |
167 void clear_n_completed_buffers() { _n_completed_buffers = 0;} | |
168 | |
169 jint processed_buffers_mut() { | |
170 return _processed_buffers_mut; | |
171 } | |
172 jint processed_buffers_rs_thread() { | |
173 return _processed_buffers_rs_thread; | |
174 } | |
175 | |
176 }; | |
1972 | 177 |
178 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP |