Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
author | mgerdin |
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date | Thu, 09 Oct 2014 15:42:23 +0200 |
parents | 42c091d63c72 |
children | c2844108a708 |
rev | line source |
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342 | 1 /* |
20731 | 2 * Copyright (c) 2001, 2014, 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 |
20731 | 50 // Flush before destroying; queue may be used to capture pending work while |
51 // doing something else, with auto-flush on completion. | |
52 ~DirtyCardQueue() { if (!is_permanent()) flush(); } | |
53 | |
54 // Process queue entries and release resources. | |
55 void flush() { flush_impl(); } | |
56 | |
342 | 57 // Apply the closure to all elements, and reset the index to make the |
58 // buffer empty. If a closure application returns "false", return | |
59 // "false" immediately, halting the iteration. If "consume" is true, | |
60 // deletes processed entries from logs. | |
61 bool apply_closure(CardTableEntryClosure* cl, | |
62 bool consume = true, | |
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63 uint worker_i = 0); |
342 | 64 |
65 // Apply the closure to all elements of "buf", down to "index" | |
66 // (inclusive.) If returns "false", then a closure application returned | |
67 // "false", and we return immediately. If "consume" is true, entries are | |
68 // set to NULL as they are processed, so they will not be processed again | |
69 // later. | |
70 static bool apply_closure_to_buffer(CardTableEntryClosure* cl, | |
71 void** buf, size_t index, size_t sz, | |
72 bool consume = true, | |
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73 uint worker_i = 0); |
342 | 74 void **get_buf() { return _buf;} |
75 void set_buf(void **buf) {_buf = buf;} | |
76 size_t get_index() { return _index;} | |
77 void reinitialize() { _buf = 0; _sz = 0; _index = 0;} | |
78 }; | |
79 | |
80 | |
81 | |
82 class DirtyCardQueueSet: public PtrQueueSet { | |
83 CardTableEntryClosure* _closure; | |
84 | |
85 DirtyCardQueue _shared_dirty_card_queue; | |
86 | |
87 // Override. | |
88 bool mut_process_buffer(void** buf); | |
89 | |
90 // Protected by the _cbl_mon. | |
91 FreeIdSet* _free_ids; | |
92 | |
93 // The number of completed buffers processed by mutator and rs thread, | |
94 // respectively. | |
95 jint _processed_buffers_mut; | |
96 jint _processed_buffers_rs_thread; | |
97 | |
98 public: | |
1111 | 99 DirtyCardQueueSet(bool notify_when_complete = true); |
342 | 100 |
101 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 102 int process_completed_threshold, |
103 int max_completed_queue, | |
104 Mutex* lock, PtrQueueSet* fl_owner = NULL); | |
342 | 105 |
106 // The number of parallel ids that can be claimed to allow collector or | |
107 // mutator threads to do card-processing work. | |
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108 static uint num_par_ids(); |
342 | 109 |
110 static void handle_zero_index_for_thread(JavaThread* t); | |
111 | |
112 // Register "blk" as "the closure" for all queues. Only one such closure | |
113 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
114 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
115 // applies it to partially-filled buffers (the latter should only be done | |
116 // with the world stopped). | |
117 void set_closure(CardTableEntryClosure* closure); | |
118 | |
119 // If there is a registered closure for buffers, apply it to all entries | |
120 // in all currently-active buffers. This should only be applied at a | |
121 // safepoint. (Currently must not be called in parallel; this should | |
122 // change in the future.) If "consume" is true, processed entries are | |
123 // discarded. | |
124 void iterate_closure_all_threads(bool consume = true, | |
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125 uint worker_i = 0); |
342 | 126 |
127 // If there exists some completed buffer, pop it, then apply the | |
128 // registered closure to all its elements, nulling out those elements | |
129 // processed. If all elements are processed, returns "true". If no | |
130 // completed buffers exist, returns false. If a completed buffer exists, | |
131 // but is only partially completed before a "yield" happens, the | |
132 // partially completed buffer (with its processed elements set to NULL) | |
133 // is returned to the completed buffer set, and this call returns false. | |
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134 bool apply_closure_to_completed_buffer(uint worker_i = 0, |
342 | 135 int stop_at = 0, |
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136 bool during_pause = false); |
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137 |
1705 | 138 // If there exists some completed buffer, pop it, then apply the |
139 // specified closure to all its elements, nulling out those elements | |
140 // processed. If all elements are processed, returns "true". If no | |
141 // completed buffers exist, returns false. If a completed buffer exists, | |
142 // but is only partially completed before a "yield" happens, the | |
143 // partially completed buffer (with its processed elements set to NULL) | |
144 // is returned to the completed buffer set, and this call returns false. | |
145 bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl, | |
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146 uint worker_i = 0, |
1705 | 147 int stop_at = 0, |
148 bool during_pause = false); | |
149 | |
150 // Helper routine for the above. | |
151 bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl, | |
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152 uint worker_i, |
1111 | 153 BufferNode* nd); |
342 | 154 |
1111 | 155 BufferNode* get_completed_buffer(int stop_at); |
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156 |
342 | 157 // Applies the current closure to all completed buffers, |
158 // non-consumptively. | |
159 void apply_closure_to_all_completed_buffers(); | |
160 | |
161 DirtyCardQueue* shared_dirty_card_queue() { | |
162 return &_shared_dirty_card_queue; | |
163 } | |
164 | |
1705 | 165 // Deallocate any completed log buffers |
166 void clear(); | |
167 | |
342 | 168 // If a full collection is happening, reset partial logs, and ignore |
169 // completed ones: the full collection will make them all irrelevant. | |
170 void abandon_logs(); | |
171 | |
172 // If any threads have partial logs, add them to the global list of logs. | |
173 void concatenate_logs(); | |
174 void clear_n_completed_buffers() { _n_completed_buffers = 0;} | |
175 | |
176 jint processed_buffers_mut() { | |
177 return _processed_buffers_mut; | |
178 } | |
179 jint processed_buffers_rs_thread() { | |
180 return _processed_buffers_rs_thread; | |
181 } | |
182 | |
183 }; | |
1972 | 184 |
185 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP |