Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/ptrQueue.hpp @ 11979:8d4ff57af591
8022051: G1: Remove some unused G1 flags
Reviewed-by: tschatzl, jmasa
| author | brutisso |
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| date | Thu, 01 Aug 2013 17:29:49 +0200 |
| parents | 2ace1c4ee8da |
| children | 69f26e8e09f9 |
| 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_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 { |
| 342 | 41 |
| 42 protected: | |
| 43 // The ptr queue set to which this queue belongs. | |
| 44 PtrQueueSet* _qset; | |
| 45 | |
| 46 // Whether updates should be logged. | |
| 47 bool _active; | |
| 48 | |
| 49 // The buffer. | |
| 50 void** _buf; | |
| 51 // The index at which an object was last enqueued. Starts at "_sz" | |
| 52 // (indicating an empty buffer) and goes towards zero. | |
| 53 size_t _index; | |
| 54 | |
| 55 // The size of the buffer. | |
| 56 size_t _sz; | |
| 57 | |
| 58 // If true, the queue is permanent, and doesn't need to deallocate | |
| 59 // its buffer in the destructor (since that obtains a lock which may not | |
| 60 // be legally locked by then. | |
| 61 bool _perm; | |
| 62 | |
| 63 // If there is a lock associated with this buffer, this is that lock. | |
| 64 Mutex* _lock; | |
| 65 | |
| 66 PtrQueueSet* qset() { return _qset; } | |
| 67 | |
| 68 public: | |
| 69 // Initialize this queue to contain a null buffer, and be part of the | |
| 70 // given PtrQueueSet. | |
| 2149 | 71 PtrQueue(PtrQueueSet* qset, bool perm = false, bool active = false); |
| 342 | 72 // Release any contained resources. |
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73 virtual void flush(); |
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74 // Calls flush() when destroyed. |
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75 ~PtrQueue() { flush(); } |
| 342 | 76 |
| 77 // Associate a lock with a ptr queue. | |
| 78 void set_lock(Mutex* lock) { _lock = lock; } | |
| 79 | |
| 80 void reset() { if (_buf != NULL) _index = _sz; } | |
| 81 | |
| 82 // Enqueues the given "obj". | |
| 83 void enqueue(void* ptr) { | |
| 84 if (!_active) return; | |
| 85 else enqueue_known_active(ptr); | |
| 86 } | |
| 87 | |
| 2149 | 88 // This method is called when we're doing the zero index handling |
| 89 // and gives a chance to the queues to do any pre-enqueueing | |
| 90 // processing they might want to do on the buffer. It should return | |
| 91 // true if the buffer should be enqueued, or false if enough | |
| 92 // entries were cleared from it so that it can be re-used. It should | |
| 93 // not return false if the buffer is still full (otherwise we can | |
| 94 // get into an infinite loop). | |
| 95 virtual bool should_enqueue_buffer() { return true; } | |
| 1111 | 96 void handle_zero_index(); |
| 342 | 97 void locking_enqueue_completed_buffer(void** buf); |
| 98 | |
| 99 void enqueue_known_active(void* ptr); | |
| 100 | |
| 101 size_t size() { | |
| 102 assert(_sz >= _index, "Invariant."); | |
| 103 return _buf == NULL ? 0 : _sz - _index; | |
| 104 } | |
| 105 | |
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106 bool is_empty() { |
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107 return _buf == NULL || _sz == _index; |
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108 } |
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109 |
| 342 | 110 // Set the "active" property of the queue to "b". An enqueue to an |
| 111 // inactive thread is a no-op. Setting a queue to inactive resets its | |
| 112 // log to the empty state. | |
| 113 void set_active(bool b) { | |
| 114 _active = b; | |
| 115 if (!b && _buf != NULL) { | |
| 116 _index = _sz; | |
| 117 } else if (b && _buf != NULL) { | |
| 118 assert(_index == _sz, "invariant: queues are empty when activated."); | |
| 119 } | |
| 120 } | |
| 121 | |
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122 bool is_active() { return _active; } |
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123 |
| 342 | 124 static int byte_index_to_index(int ind) { |
| 125 assert((ind % oopSize) == 0, "Invariant."); | |
| 126 return ind / oopSize; | |
| 127 } | |
| 128 | |
| 129 static int index_to_byte_index(int byte_ind) { | |
| 130 return byte_ind * oopSize; | |
| 131 } | |
| 132 | |
| 133 // To support compiler. | |
| 134 static ByteSize byte_offset_of_index() { | |
| 135 return byte_offset_of(PtrQueue, _index); | |
| 136 } | |
| 137 static ByteSize byte_width_of_index() { return in_ByteSize(sizeof(size_t)); } | |
| 138 | |
| 139 static ByteSize byte_offset_of_buf() { | |
| 140 return byte_offset_of(PtrQueue, _buf); | |
| 141 } | |
| 142 static ByteSize byte_width_of_buf() { return in_ByteSize(sizeof(void*)); } | |
| 143 | |
| 144 static ByteSize byte_offset_of_active() { | |
| 145 return byte_offset_of(PtrQueue, _active); | |
| 146 } | |
| 147 static ByteSize byte_width_of_active() { return in_ByteSize(sizeof(bool)); } | |
| 148 | |
| 149 }; | |
| 150 | |
| 1111 | 151 class BufferNode { |
| 152 size_t _index; | |
| 153 BufferNode* _next; | |
| 154 public: | |
| 155 BufferNode() : _index(0), _next(NULL) { } | |
| 156 BufferNode* next() const { return _next; } | |
| 157 void set_next(BufferNode* n) { _next = n; } | |
| 158 size_t index() const { return _index; } | |
| 159 void set_index(size_t i) { _index = i; } | |
| 160 | |
| 161 // Align the size of the structure to the size of the pointer | |
| 162 static size_t aligned_size() { | |
| 163 static const size_t alignment = round_to(sizeof(BufferNode), sizeof(void*)); | |
| 164 return alignment; | |
| 165 } | |
| 166 | |
| 167 // BufferNode is allocated before the buffer. | |
| 168 // The chunk of memory that holds both of them is a block. | |
| 169 | |
| 170 // Produce a new BufferNode given a buffer. | |
| 171 static BufferNode* new_from_buffer(void** buf) { | |
| 172 return new (make_block_from_buffer(buf)) BufferNode; | |
| 173 } | |
| 174 | |
| 175 // The following are the required conversion routines: | |
| 176 static BufferNode* make_node_from_buffer(void** buf) { | |
| 177 return (BufferNode*)make_block_from_buffer(buf); | |
| 178 } | |
| 179 static void** make_buffer_from_node(BufferNode *node) { | |
| 180 return make_buffer_from_block(node); | |
| 181 } | |
| 182 static void* make_block_from_node(BufferNode *node) { | |
| 183 return (void*)node; | |
| 184 } | |
| 185 static void** make_buffer_from_block(void* p) { | |
| 186 return (void**)((char*)p + aligned_size()); | |
| 187 } | |
| 188 static void* make_block_from_buffer(void** p) { | |
| 189 return (void*)((char*)p - aligned_size()); | |
| 190 } | |
| 191 }; | |
| 192 | |
| 342 | 193 // A PtrQueueSet represents resources common to a set of pointer queues. |
| 194 // In particular, the individual queues allocate buffers from this shared | |
| 195 // set, and return completed buffers to the set. | |
| 196 // All these variables are are protected by the TLOQ_CBL_mon. XXX ??? | |
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197 class PtrQueueSet VALUE_OBJ_CLASS_SPEC { |
| 342 | 198 protected: |
| 199 Monitor* _cbl_mon; // Protects the fields below. | |
| 1111 | 200 BufferNode* _completed_buffers_head; |
| 201 BufferNode* _completed_buffers_tail; | |
| 202 int _n_completed_buffers; | |
| 203 int _process_completed_threshold; | |
| 342 | 204 volatile bool _process_completed; |
| 205 | |
| 206 // This (and the interpretation of the first element as a "next" | |
| 207 // pointer) are protected by the TLOQ_FL_lock. | |
| 208 Mutex* _fl_lock; | |
| 1111 | 209 BufferNode* _buf_free_list; |
| 342 | 210 size_t _buf_free_list_sz; |
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211 // Queue set can share a freelist. The _fl_owner variable |
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212 // specifies the owner. It is set to "this" by default. |
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213 PtrQueueSet* _fl_owner; |
| 342 | 214 |
| 215 // The size of all buffers in the set. | |
| 216 size_t _sz; | |
| 217 | |
| 218 bool _all_active; | |
| 219 | |
| 220 // If true, notify_all on _cbl_mon when the threshold is reached. | |
| 221 bool _notify_when_complete; | |
| 222 | |
| 223 // Maximum number of elements allowed on completed queue: after that, | |
| 224 // enqueuer does the work itself. Zero indicates no maximum. | |
| 225 int _max_completed_queue; | |
| 1111 | 226 int _completed_queue_padding; |
| 342 | 227 |
| 228 int completed_buffers_list_length(); | |
| 229 void assert_completed_buffer_list_len_correct_locked(); | |
| 230 void assert_completed_buffer_list_len_correct(); | |
| 231 | |
| 232 protected: | |
| 233 // A mutator thread does the the work of processing a buffer. | |
| 234 // Returns "true" iff the work is complete (and the buffer may be | |
| 235 // deallocated). | |
| 236 virtual bool mut_process_buffer(void** buf) { | |
| 237 ShouldNotReachHere(); | |
| 238 return false; | |
| 239 } | |
| 240 | |
| 241 public: | |
| 242 // Create an empty ptr queue set. | |
| 243 PtrQueueSet(bool notify_when_complete = false); | |
| 244 | |
| 245 // Because of init-order concerns, we can't pass these as constructor | |
| 246 // arguments. | |
| 247 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
| 1111 | 248 int process_completed_threshold, |
| 249 int max_completed_queue, | |
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250 PtrQueueSet *fl_owner = NULL) { |
| 342 | 251 _max_completed_queue = max_completed_queue; |
| 1111 | 252 _process_completed_threshold = process_completed_threshold; |
| 253 _completed_queue_padding = 0; | |
| 342 | 254 assert(cbl_mon != NULL && fl_lock != NULL, "Init order issue?"); |
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255 _cbl_mon = cbl_mon; |
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256 _fl_lock = fl_lock; |
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257 _fl_owner = (fl_owner != NULL) ? fl_owner : this; |
| 342 | 258 } |
| 259 | |
| 260 // Return an empty oop array of size _sz (required to be non-zero). | |
| 261 void** allocate_buffer(); | |
| 262 | |
| 263 // Return an empty buffer to the free list. The "buf" argument is | |
| 264 // required to be a pointer to the head of an array of length "_sz". | |
| 265 void deallocate_buffer(void** buf); | |
| 266 | |
| 267 // Declares that "buf" is a complete buffer. | |
| 1111 | 268 void enqueue_complete_buffer(void** buf, size_t index = 0); |
| 269 | |
| 270 // To be invoked by the mutator. | |
| 271 bool process_or_enqueue_complete_buffer(void** buf); | |
| 342 | 272 |
| 273 bool completed_buffers_exist_dirty() { | |
| 274 return _n_completed_buffers > 0; | |
| 275 } | |
| 276 | |
| 277 bool process_completed_buffers() { return _process_completed; } | |
| 1111 | 278 void set_process_completed(bool x) { _process_completed = x; } |
| 342 | 279 |
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280 bool is_active() { return _all_active; } |
| 342 | 281 |
| 282 // Set the buffer size. Should be called before any "enqueue" operation | |
| 283 // can be called. And should only be called once. | |
| 284 void set_buffer_size(size_t sz); | |
| 285 | |
| 286 // Get the buffer size. | |
| 287 size_t buffer_size() { return _sz; } | |
| 288 | |
| 1111 | 289 // Get/Set the number of completed buffers that triggers log processing. |
| 290 void set_process_completed_threshold(int sz) { _process_completed_threshold = sz; } | |
| 291 int process_completed_threshold() const { return _process_completed_threshold; } | |
| 342 | 292 |
| 293 // Must only be called at a safe point. Indicates that the buffer free | |
| 294 // list size may be reduced, if that is deemed desirable. | |
| 295 void reduce_free_list(); | |
| 296 | |
| 1111 | 297 int completed_buffers_num() { return _n_completed_buffers; } |
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298 |
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299 void merge_bufferlists(PtrQueueSet* src); |
| 1111 | 300 |
| 301 void set_max_completed_queue(int m) { _max_completed_queue = m; } | |
| 302 int max_completed_queue() { return _max_completed_queue; } | |
| 303 | |
| 304 void set_completed_queue_padding(int padding) { _completed_queue_padding = padding; } | |
| 305 int completed_queue_padding() { return _completed_queue_padding; } | |
| 306 | |
| 307 // Notify the consumer if the number of buffers crossed the threshold | |
| 308 void notify_if_necessary(); | |
| 342 | 309 }; |
| 1972 | 310 |
| 311 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP |