Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp @ 20445:e5668dcf12e9
8057818: collect allocation context statistics at gc pauses
Reviewed-by: mikael, jmasa
| author | jcoomes |
|---|---|
| date | Wed, 10 Sep 2014 13:01:13 -0700 |
| parents | 570cb6369f17 |
| children | c2844108a708 |
| rev | line source |
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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 { | |
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76 // The closure used in mut_process_buffer(). |
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77 CardTableEntryClosure* _mut_process_closure; |
| 342 | 78 |
| 79 DirtyCardQueue _shared_dirty_card_queue; | |
| 80 | |
| 81 // Override. | |
| 82 bool mut_process_buffer(void** buf); | |
| 83 | |
| 84 // Protected by the _cbl_mon. | |
| 85 FreeIdSet* _free_ids; | |
| 86 | |
| 87 // The number of completed buffers processed by mutator and rs thread, | |
| 88 // respectively. | |
| 89 jint _processed_buffers_mut; | |
| 90 jint _processed_buffers_rs_thread; | |
| 91 | |
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92 // Current buffer node used for parallel iteration. |
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93 BufferNode* volatile _cur_par_buffer_node; |
| 342 | 94 public: |
| 1111 | 95 DirtyCardQueueSet(bool notify_when_complete = true); |
| 342 | 96 |
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97 void initialize(CardTableEntryClosure* cl, Monitor* cbl_mon, Mutex* fl_lock, |
| 1111 | 98 int process_completed_threshold, |
| 99 int max_completed_queue, | |
| 100 Mutex* lock, PtrQueueSet* fl_owner = NULL); | |
| 342 | 101 |
| 102 // The number of parallel ids that can be claimed to allow collector or | |
| 103 // mutator threads to do card-processing work. | |
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104 static uint num_par_ids(); |
| 342 | 105 |
| 106 static void handle_zero_index_for_thread(JavaThread* t); | |
| 107 | |
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108 // Apply the given closure to all entries in all currently-active buffers. |
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109 // This should only be applied at a safepoint. (Currently must not be called |
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110 // in parallel; this should change in the future.) If "consume" is true, |
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111 // processed entries are discarded. |
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112 void iterate_closure_all_threads(CardTableEntryClosure* cl, |
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113 bool consume = true, |
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114 uint worker_i = 0); |
| 342 | 115 |
| 116 // If there exists some completed buffer, pop it, then apply the | |
| 1705 | 117 // specified closure to all its elements, nulling out those elements |
| 118 // processed. If all elements are processed, returns "true". If no | |
| 119 // completed buffers exist, returns false. If a completed buffer exists, | |
| 120 // but is only partially completed before a "yield" happens, the | |
| 121 // partially completed buffer (with its processed elements set to NULL) | |
| 122 // is returned to the completed buffer set, and this call returns false. | |
| 123 bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl, | |
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124 uint worker_i = 0, |
| 1705 | 125 int stop_at = 0, |
| 126 bool during_pause = false); | |
| 127 | |
| 128 // Helper routine for the above. | |
| 129 bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl, | |
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130 uint worker_i, |
| 1111 | 131 BufferNode* nd); |
| 342 | 132 |
| 1111 | 133 BufferNode* get_completed_buffer(int stop_at); |
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134 |
| 342 | 135 // Applies the current closure to all completed buffers, |
| 136 // non-consumptively. | |
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137 void apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl); |
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138 |
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139 void reset_for_par_iteration() { _cur_par_buffer_node = _completed_buffers_head; } |
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140 // Applies the current closure to all completed buffers, non-consumptively. |
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141 // Parallel version. |
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142 void par_apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl); |
| 342 | 143 |
| 144 DirtyCardQueue* shared_dirty_card_queue() { | |
| 145 return &_shared_dirty_card_queue; | |
| 146 } | |
| 147 | |
| 1705 | 148 // Deallocate any completed log buffers |
| 149 void clear(); | |
| 150 | |
| 342 | 151 // If a full collection is happening, reset partial logs, and ignore |
| 152 // completed ones: the full collection will make them all irrelevant. | |
| 153 void abandon_logs(); | |
| 154 | |
| 155 // If any threads have partial logs, add them to the global list of logs. | |
| 156 void concatenate_logs(); | |
| 157 void clear_n_completed_buffers() { _n_completed_buffers = 0;} | |
| 158 | |
| 159 jint processed_buffers_mut() { | |
| 160 return _processed_buffers_mut; | |
| 161 } | |
| 162 jint processed_buffers_rs_thread() { | |
| 163 return _processed_buffers_rs_thread; | |
| 164 } | |
| 165 | |
| 166 }; | |
| 1972 | 167 |
| 168 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP |