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annotate src/share/vm/gc_implementation/g1/ptrQueue.hpp @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
| author | mikael |
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| date | Tue, 24 Dec 2013 11:48:39 -0800 |
| parents | 69944b868a32 |
| children | 4ca6dc0799b6 42c091d63c72 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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_PTRQUEUE_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "utilities/sizes.hpp" | |
| 30 | |
| 342 | 31 // There are various techniques that require threads to be able to log |
| 32 // addresses. For example, a generational write barrier might log | |
| 33 // the addresses of modified old-generation objects. This type supports | |
| 34 // this operation. | |
| 35 | |
| 1111 | 36 // The definition of placement operator new(size_t, void*) in the <new>. |
| 37 #include <new> | |
| 38 | |
| 342 | 39 class PtrQueueSet; |
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40 class PtrQueue VALUE_OBJ_CLASS_SPEC { |
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41 friend class VMStructs; |
| 342 | 42 |
| 43 protected: | |
| 44 // The ptr queue set to which this queue belongs. | |
| 45 PtrQueueSet* _qset; | |
| 46 | |
| 47 // Whether updates should be logged. | |
| 48 bool _active; | |
| 49 | |
| 50 // The buffer. | |
| 51 void** _buf; | |
| 52 // The index at which an object was last enqueued. Starts at "_sz" | |
| 53 // (indicating an empty buffer) and goes towards zero. | |
| 54 size_t _index; | |
| 55 | |
| 56 // The size of the buffer. | |
| 57 size_t _sz; | |
| 58 | |
| 59 // If true, the queue is permanent, and doesn't need to deallocate | |
| 60 // its buffer in the destructor (since that obtains a lock which may not | |
| 61 // be legally locked by then. | |
| 62 bool _perm; | |
| 63 | |
| 64 // If there is a lock associated with this buffer, this is that lock. | |
| 65 Mutex* _lock; | |
| 66 | |
| 67 PtrQueueSet* qset() { return _qset; } | |
| 68 | |
| 69 public: | |
| 70 // Initialize this queue to contain a null buffer, and be part of the | |
| 71 // given PtrQueueSet. | |
| 2149 | 72 PtrQueue(PtrQueueSet* qset, bool perm = false, bool active = false); |
| 342 | 73 // Release any contained resources. |
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74 virtual void flush(); |
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75 // Calls flush() when destroyed. |
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76 ~PtrQueue() { flush(); } |
| 342 | 77 |
| 78 // Associate a lock with a ptr queue. | |
| 79 void set_lock(Mutex* lock) { _lock = lock; } | |
| 80 | |
| 81 void reset() { if (_buf != NULL) _index = _sz; } | |
| 82 | |
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83 void enqueue(volatile void* ptr) { |
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84 enqueue((void*)(ptr)); |
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85 } |
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86 |
| 342 | 87 // Enqueues the given "obj". |
| 88 void enqueue(void* ptr) { | |
| 89 if (!_active) return; | |
| 90 else enqueue_known_active(ptr); | |
| 91 } | |
| 92 | |
| 2149 | 93 // This method is called when we're doing the zero index handling |
| 94 // and gives a chance to the queues to do any pre-enqueueing | |
| 95 // processing they might want to do on the buffer. It should return | |
| 96 // true if the buffer should be enqueued, or false if enough | |
| 97 // entries were cleared from it so that it can be re-used. It should | |
| 98 // not return false if the buffer is still full (otherwise we can | |
| 99 // get into an infinite loop). | |
| 100 virtual bool should_enqueue_buffer() { return true; } | |
| 1111 | 101 void handle_zero_index(); |
| 342 | 102 void locking_enqueue_completed_buffer(void** buf); |
| 103 | |
| 104 void enqueue_known_active(void* ptr); | |
| 105 | |
| 106 size_t size() { | |
| 107 assert(_sz >= _index, "Invariant."); | |
| 108 return _buf == NULL ? 0 : _sz - _index; | |
| 109 } | |
| 110 | |
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111 bool is_empty() { |
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112 return _buf == NULL || _sz == _index; |
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113 } |
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114 |
| 342 | 115 // Set the "active" property of the queue to "b". An enqueue to an |
| 116 // inactive thread is a no-op. Setting a queue to inactive resets its | |
| 117 // log to the empty state. | |
| 118 void set_active(bool b) { | |
| 119 _active = b; | |
| 120 if (!b && _buf != NULL) { | |
| 121 _index = _sz; | |
| 122 } else if (b && _buf != NULL) { | |
| 123 assert(_index == _sz, "invariant: queues are empty when activated."); | |
| 124 } | |
| 125 } | |
| 126 | |
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127 bool is_active() { return _active; } |
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128 |
| 342 | 129 static int byte_index_to_index(int ind) { |
| 130 assert((ind % oopSize) == 0, "Invariant."); | |
| 131 return ind / oopSize; | |
| 132 } | |
| 133 | |
| 134 static int index_to_byte_index(int byte_ind) { | |
| 135 return byte_ind * oopSize; | |
| 136 } | |
| 137 | |
| 138 // To support compiler. | |
| 139 static ByteSize byte_offset_of_index() { | |
| 140 return byte_offset_of(PtrQueue, _index); | |
| 141 } | |
| 142 static ByteSize byte_width_of_index() { return in_ByteSize(sizeof(size_t)); } | |
| 143 | |
| 144 static ByteSize byte_offset_of_buf() { | |
| 145 return byte_offset_of(PtrQueue, _buf); | |
| 146 } | |
| 147 static ByteSize byte_width_of_buf() { return in_ByteSize(sizeof(void*)); } | |
| 148 | |
| 149 static ByteSize byte_offset_of_active() { | |
| 150 return byte_offset_of(PtrQueue, _active); | |
| 151 } | |
| 152 static ByteSize byte_width_of_active() { return in_ByteSize(sizeof(bool)); } | |
| 153 | |
| 154 }; | |
| 155 | |
| 1111 | 156 class BufferNode { |
| 157 size_t _index; | |
| 158 BufferNode* _next; | |
| 159 public: | |
| 160 BufferNode() : _index(0), _next(NULL) { } | |
| 161 BufferNode* next() const { return _next; } | |
| 162 void set_next(BufferNode* n) { _next = n; } | |
| 163 size_t index() const { return _index; } | |
| 164 void set_index(size_t i) { _index = i; } | |
| 165 | |
| 166 // Align the size of the structure to the size of the pointer | |
| 167 static size_t aligned_size() { | |
| 168 static const size_t alignment = round_to(sizeof(BufferNode), sizeof(void*)); | |
| 169 return alignment; | |
| 170 } | |
| 171 | |
| 172 // BufferNode is allocated before the buffer. | |
| 173 // The chunk of memory that holds both of them is a block. | |
| 174 | |
| 175 // Produce a new BufferNode given a buffer. | |
| 176 static BufferNode* new_from_buffer(void** buf) { | |
| 177 return new (make_block_from_buffer(buf)) BufferNode; | |
| 178 } | |
| 179 | |
| 180 // The following are the required conversion routines: | |
| 181 static BufferNode* make_node_from_buffer(void** buf) { | |
| 182 return (BufferNode*)make_block_from_buffer(buf); | |
| 183 } | |
| 184 static void** make_buffer_from_node(BufferNode *node) { | |
| 185 return make_buffer_from_block(node); | |
| 186 } | |
| 187 static void* make_block_from_node(BufferNode *node) { | |
| 188 return (void*)node; | |
| 189 } | |
| 190 static void** make_buffer_from_block(void* p) { | |
| 191 return (void**)((char*)p + aligned_size()); | |
| 192 } | |
| 193 static void* make_block_from_buffer(void** p) { | |
| 194 return (void*)((char*)p - aligned_size()); | |
| 195 } | |
| 196 }; | |
| 197 | |
| 342 | 198 // A PtrQueueSet represents resources common to a set of pointer queues. |
| 199 // In particular, the individual queues allocate buffers from this shared | |
| 200 // set, and return completed buffers to the set. | |
| 201 // All these variables are are protected by the TLOQ_CBL_mon. XXX ??? | |
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202 class PtrQueueSet VALUE_OBJ_CLASS_SPEC { |
| 342 | 203 protected: |
| 204 Monitor* _cbl_mon; // Protects the fields below. | |
| 1111 | 205 BufferNode* _completed_buffers_head; |
| 206 BufferNode* _completed_buffers_tail; | |
| 207 int _n_completed_buffers; | |
| 208 int _process_completed_threshold; | |
| 342 | 209 volatile bool _process_completed; |
| 210 | |
| 211 // This (and the interpretation of the first element as a "next" | |
| 212 // pointer) are protected by the TLOQ_FL_lock. | |
| 213 Mutex* _fl_lock; | |
| 1111 | 214 BufferNode* _buf_free_list; |
| 342 | 215 size_t _buf_free_list_sz; |
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216 // Queue set can share a freelist. The _fl_owner variable |
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217 // specifies the owner. It is set to "this" by default. |
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218 PtrQueueSet* _fl_owner; |
| 342 | 219 |
| 220 // The size of all buffers in the set. | |
| 221 size_t _sz; | |
| 222 | |
| 223 bool _all_active; | |
| 224 | |
| 225 // If true, notify_all on _cbl_mon when the threshold is reached. | |
| 226 bool _notify_when_complete; | |
| 227 | |
| 228 // Maximum number of elements allowed on completed queue: after that, | |
| 229 // enqueuer does the work itself. Zero indicates no maximum. | |
| 230 int _max_completed_queue; | |
| 1111 | 231 int _completed_queue_padding; |
| 342 | 232 |
| 233 int completed_buffers_list_length(); | |
| 234 void assert_completed_buffer_list_len_correct_locked(); | |
| 235 void assert_completed_buffer_list_len_correct(); | |
| 236 | |
| 237 protected: | |
| 238 // A mutator thread does the the work of processing a buffer. | |
| 239 // Returns "true" iff the work is complete (and the buffer may be | |
| 240 // deallocated). | |
| 241 virtual bool mut_process_buffer(void** buf) { | |
| 242 ShouldNotReachHere(); | |
| 243 return false; | |
| 244 } | |
| 245 | |
| 246 public: | |
| 247 // Create an empty ptr queue set. | |
| 248 PtrQueueSet(bool notify_when_complete = false); | |
| 249 | |
| 250 // Because of init-order concerns, we can't pass these as constructor | |
| 251 // arguments. | |
| 252 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
| 1111 | 253 int process_completed_threshold, |
| 254 int max_completed_queue, | |
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255 PtrQueueSet *fl_owner = NULL) { |
| 342 | 256 _max_completed_queue = max_completed_queue; |
| 1111 | 257 _process_completed_threshold = process_completed_threshold; |
| 258 _completed_queue_padding = 0; | |
| 342 | 259 assert(cbl_mon != NULL && fl_lock != NULL, "Init order issue?"); |
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260 _cbl_mon = cbl_mon; |
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261 _fl_lock = fl_lock; |
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262 _fl_owner = (fl_owner != NULL) ? fl_owner : this; |
| 342 | 263 } |
| 264 | |
| 265 // Return an empty oop array of size _sz (required to be non-zero). | |
| 266 void** allocate_buffer(); | |
| 267 | |
| 268 // Return an empty buffer to the free list. The "buf" argument is | |
| 269 // required to be a pointer to the head of an array of length "_sz". | |
| 270 void deallocate_buffer(void** buf); | |
| 271 | |
| 272 // Declares that "buf" is a complete buffer. | |
| 1111 | 273 void enqueue_complete_buffer(void** buf, size_t index = 0); |
| 274 | |
| 275 // To be invoked by the mutator. | |
| 276 bool process_or_enqueue_complete_buffer(void** buf); | |
| 342 | 277 |
| 278 bool completed_buffers_exist_dirty() { | |
| 279 return _n_completed_buffers > 0; | |
| 280 } | |
| 281 | |
| 282 bool process_completed_buffers() { return _process_completed; } | |
| 1111 | 283 void set_process_completed(bool x) { _process_completed = x; } |
| 342 | 284 |
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285 bool is_active() { return _all_active; } |
| 342 | 286 |
| 287 // Set the buffer size. Should be called before any "enqueue" operation | |
| 288 // can be called. And should only be called once. | |
| 289 void set_buffer_size(size_t sz); | |
| 290 | |
| 291 // Get the buffer size. | |
| 292 size_t buffer_size() { return _sz; } | |
| 293 | |
| 1111 | 294 // Get/Set the number of completed buffers that triggers log processing. |
| 295 void set_process_completed_threshold(int sz) { _process_completed_threshold = sz; } | |
| 296 int process_completed_threshold() const { return _process_completed_threshold; } | |
| 342 | 297 |
| 298 // Must only be called at a safe point. Indicates that the buffer free | |
| 299 // list size may be reduced, if that is deemed desirable. | |
| 300 void reduce_free_list(); | |
| 301 | |
| 1111 | 302 int completed_buffers_num() { return _n_completed_buffers; } |
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303 |
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304 void merge_bufferlists(PtrQueueSet* src); |
| 1111 | 305 |
| 306 void set_max_completed_queue(int m) { _max_completed_queue = m; } | |
| 307 int max_completed_queue() { return _max_completed_queue; } | |
| 308 | |
| 309 void set_completed_queue_padding(int padding) { _completed_queue_padding = padding; } | |
| 310 int completed_queue_padding() { return _completed_queue_padding; } | |
| 311 | |
| 312 // Notify the consumer if the number of buffers crossed the threshold | |
| 313 void notify_if_necessary(); | |
| 342 | 314 }; |
| 1972 | 315 |
| 316 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP |