Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 11979:8d4ff57af591
8022051: G1: Remove some unused G1 flags
Reviewed-by: tschatzl, jmasa
| author | brutisso |
|---|---|
| date | Thu, 01 Aug 2013 17:29:49 +0200 |
| parents | cc32ccaaf47f |
| children | de6a9e811145 |
| rev | line source |
|---|---|
| 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 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/ptrQueue.hpp" | |
| 27 #include "memory/allocation.hpp" | |
| 28 #include "memory/allocation.inline.hpp" | |
| 29 #include "runtime/mutex.hpp" | |
| 30 #include "runtime/mutexLocker.hpp" | |
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31 #include "runtime/thread.inline.hpp" |
| 342 | 32 |
| 2149 | 33 PtrQueue::PtrQueue(PtrQueueSet* qset, bool perm, bool active) : |
| 34 _qset(qset), _buf(NULL), _index(0), _active(active), | |
| 342 | 35 _perm(perm), _lock(NULL) |
| 36 {} | |
| 37 | |
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38 void PtrQueue::flush() { |
| 342 | 39 if (!_perm && _buf != NULL) { |
| 40 if (_index == _sz) { | |
| 41 // No work to do. | |
| 42 qset()->deallocate_buffer(_buf); | |
| 43 } else { | |
| 44 // We must NULL out the unused entries, then enqueue. | |
| 45 for (size_t i = 0; i < _index; i += oopSize) { | |
| 46 _buf[byte_index_to_index((int)i)] = NULL; | |
| 47 } | |
| 48 qset()->enqueue_complete_buffer(_buf); | |
| 49 } | |
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50 _buf = NULL; |
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51 _index = 0; |
| 342 | 52 } |
| 53 } | |
| 54 | |
| 55 | |
| 56 void PtrQueue::enqueue_known_active(void* ptr) { | |
| 57 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 58 assert(_index == 0 || _buf != NULL, "invariant"); | |
| 59 | |
| 60 while (_index == 0) { | |
| 61 handle_zero_index(); | |
| 62 } | |
| 1111 | 63 |
| 342 | 64 assert(_index > 0, "postcondition"); |
| 65 _index -= oopSize; | |
| 66 _buf[byte_index_to_index((int)_index)] = ptr; | |
| 67 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 68 } | |
| 69 | |
| 70 void PtrQueue::locking_enqueue_completed_buffer(void** buf) { | |
| 71 assert(_lock->owned_by_self(), "Required."); | |
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72 |
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73 // We have to unlock _lock (which may be Shared_DirtyCardQ_lock) before |
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74 // we acquire DirtyCardQ_CBL_mon inside enqeue_complete_buffer as they |
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75 // have the same rank and we may get the "possible deadlock" message |
| 342 | 76 _lock->unlock(); |
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77 |
| 342 | 78 qset()->enqueue_complete_buffer(buf); |
| 79 // We must relock only because the caller will unlock, for the normal | |
| 80 // case. | |
| 81 _lock->lock_without_safepoint_check(); | |
| 82 } | |
| 83 | |
| 84 | |
| 85 PtrQueueSet::PtrQueueSet(bool notify_when_complete) : | |
| 86 _max_completed_queue(0), | |
| 87 _cbl_mon(NULL), _fl_lock(NULL), | |
| 88 _notify_when_complete(notify_when_complete), | |
| 89 _sz(0), | |
| 90 _completed_buffers_head(NULL), | |
| 91 _completed_buffers_tail(NULL), | |
| 92 _n_completed_buffers(0), | |
| 93 _process_completed_threshold(0), _process_completed(false), | |
| 94 _buf_free_list(NULL), _buf_free_list_sz(0) | |
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95 { |
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96 _fl_owner = this; |
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97 } |
| 342 | 98 |
| 99 void** PtrQueueSet::allocate_buffer() { | |
| 100 assert(_sz > 0, "Didn't set a buffer size."); | |
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101 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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102 if (_fl_owner->_buf_free_list != NULL) { |
| 1111 | 103 void** res = BufferNode::make_buffer_from_node(_fl_owner->_buf_free_list); |
| 104 _fl_owner->_buf_free_list = _fl_owner->_buf_free_list->next(); | |
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105 _fl_owner->_buf_free_list_sz--; |
| 342 | 106 return res; |
| 107 } else { | |
| 1111 | 108 // Allocate space for the BufferNode in front of the buffer. |
| 6197 | 109 char *b = NEW_C_HEAP_ARRAY(char, _sz + BufferNode::aligned_size(), mtGC); |
| 1111 | 110 return BufferNode::make_buffer_from_block(b); |
| 342 | 111 } |
| 112 } | |
| 113 | |
| 114 void PtrQueueSet::deallocate_buffer(void** buf) { | |
| 115 assert(_sz > 0, "Didn't set a buffer size."); | |
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116 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
| 1111 | 117 BufferNode *node = BufferNode::make_node_from_buffer(buf); |
| 118 node->set_next(_fl_owner->_buf_free_list); | |
| 119 _fl_owner->_buf_free_list = node; | |
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120 _fl_owner->_buf_free_list_sz++; |
| 342 | 121 } |
| 122 | |
| 123 void PtrQueueSet::reduce_free_list() { | |
| 1111 | 124 assert(_fl_owner == this, "Free list reduction is allowed only for the owner"); |
| 342 | 125 // For now we'll adopt the strategy of deleting half. |
| 126 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); | |
| 127 size_t n = _buf_free_list_sz / 2; | |
| 128 while (n > 0) { | |
| 129 assert(_buf_free_list != NULL, "_buf_free_list_sz must be wrong."); | |
| 1111 | 130 void* b = BufferNode::make_block_from_node(_buf_free_list); |
| 131 _buf_free_list = _buf_free_list->next(); | |
| 6197 | 132 FREE_C_HEAP_ARRAY(char, b, mtGC); |
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133 _buf_free_list_sz --; |
| 342 | 134 n--; |
| 135 } | |
| 136 } | |
| 137 | |
| 1111 | 138 void PtrQueue::handle_zero_index() { |
| 2149 | 139 assert(_index == 0, "Precondition."); |
| 140 | |
| 1111 | 141 // This thread records the full buffer and allocates a new one (while |
| 142 // holding the lock if there is one). | |
| 143 if (_buf != NULL) { | |
| 2149 | 144 if (!should_enqueue_buffer()) { |
| 145 assert(_index > 0, "the buffer can only be re-used if it's not full"); | |
| 146 return; | |
| 147 } | |
| 148 | |
| 1111 | 149 if (_lock) { |
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150 assert(_lock->owned_by_self(), "Required."); |
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151 |
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152 // The current PtrQ may be the shared dirty card queue and |
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153 // may be being manipulated by more than one worker thread |
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154 // during a pause. Since the enqueuing of the completed |
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155 // buffer unlocks the Shared_DirtyCardQ_lock more than one |
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156 // worker thread can 'race' on reading the shared queue attributes |
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157 // (_buf and _index) and multiple threads can call into this |
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158 // routine for the same buffer. This will cause the completed |
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159 // buffer to be added to the CBL multiple times. |
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160 |
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161 // We "claim" the current buffer by caching value of _buf in |
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162 // a local and clearing the field while holding _lock. When |
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163 // _lock is released (while enqueueing the completed buffer) |
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164 // the thread that acquires _lock will skip this code, |
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165 // preventing the subsequent the multiple enqueue, and |
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166 // install a newly allocated buffer below. |
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167 |
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168 void** buf = _buf; // local pointer to completed buffer |
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169 _buf = NULL; // clear shared _buf field |
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170 |
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171 locking_enqueue_completed_buffer(buf); // enqueue completed buffer |
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172 |
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173 // While the current thread was enqueuing the buffer another thread |
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174 // may have a allocated a new buffer and inserted it into this pointer |
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175 // queue. If that happens then we just return so that the current |
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176 // thread doesn't overwrite the buffer allocated by the other thread |
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177 // and potentially losing some dirtied cards. |
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178 |
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179 if (_buf != NULL) return; |
| 1111 | 180 } else { |
| 181 if (qset()->process_or_enqueue_complete_buffer(_buf)) { | |
| 182 // Recycle the buffer. No allocation. | |
| 183 _sz = qset()->buffer_size(); | |
| 184 _index = _sz; | |
| 185 return; | |
| 186 } | |
| 187 } | |
| 188 } | |
| 189 // Reallocate the buffer | |
| 190 _buf = qset()->allocate_buffer(); | |
| 191 _sz = qset()->buffer_size(); | |
| 192 _index = _sz; | |
| 193 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 194 } | |
| 342 | 195 |
| 1111 | 196 bool PtrQueueSet::process_or_enqueue_complete_buffer(void** buf) { |
| 197 if (Thread::current()->is_Java_thread()) { | |
| 198 // We don't lock. It is fine to be epsilon-precise here. | |
| 199 if (_max_completed_queue == 0 || _max_completed_queue > 0 && | |
| 200 _n_completed_buffers >= _max_completed_queue + _completed_queue_padding) { | |
| 201 bool b = mut_process_buffer(buf); | |
| 202 if (b) { | |
| 203 // True here means that the buffer hasn't been deallocated and the caller may reuse it. | |
| 204 return true; | |
| 205 } | |
| 342 | 206 } |
| 1111 | 207 } |
| 208 // The buffer will be enqueued. The caller will have to get a new one. | |
| 209 enqueue_complete_buffer(buf); | |
| 210 return false; | |
| 211 } | |
| 342 | 212 |
| 1111 | 213 void PtrQueueSet::enqueue_complete_buffer(void** buf, size_t index) { |
| 214 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 215 BufferNode* cbn = BufferNode::new_from_buffer(buf); | |
| 216 cbn->set_index(index); | |
| 342 | 217 if (_completed_buffers_tail == NULL) { |
| 218 assert(_completed_buffers_head == NULL, "Well-formedness"); | |
| 219 _completed_buffers_head = cbn; | |
| 220 _completed_buffers_tail = cbn; | |
| 221 } else { | |
| 1111 | 222 _completed_buffers_tail->set_next(cbn); |
| 342 | 223 _completed_buffers_tail = cbn; |
| 224 } | |
| 225 _n_completed_buffers++; | |
| 226 | |
| 1111 | 227 if (!_process_completed && _process_completed_threshold >= 0 && |
| 794 | 228 _n_completed_buffers >= _process_completed_threshold) { |
| 342 | 229 _process_completed = true; |
| 230 if (_notify_when_complete) | |
| 1111 | 231 _cbl_mon->notify(); |
| 342 | 232 } |
| 233 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
| 234 } | |
| 235 | |
| 236 int PtrQueueSet::completed_buffers_list_length() { | |
| 237 int n = 0; | |
| 1111 | 238 BufferNode* cbn = _completed_buffers_head; |
| 342 | 239 while (cbn != NULL) { |
| 240 n++; | |
| 1111 | 241 cbn = cbn->next(); |
| 342 | 242 } |
| 243 return n; | |
| 244 } | |
| 245 | |
| 246 void PtrQueueSet::assert_completed_buffer_list_len_correct() { | |
| 247 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 248 assert_completed_buffer_list_len_correct_locked(); | |
| 249 } | |
| 250 | |
| 251 void PtrQueueSet::assert_completed_buffer_list_len_correct_locked() { | |
| 1111 | 252 guarantee(completed_buffers_list_length() == _n_completed_buffers, |
| 342 | 253 "Completed buffer length is wrong."); |
| 254 } | |
| 255 | |
| 256 void PtrQueueSet::set_buffer_size(size_t sz) { | |
| 257 assert(_sz == 0 && sz > 0, "Should be called only once."); | |
| 258 _sz = sz * oopSize; | |
| 259 } | |
| 260 | |
| 1111 | 261 // Merge lists of buffers. Notify the processing threads. |
| 262 // The source queue is emptied as a result. The queues | |
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263 // must share the monitor. |
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264 void PtrQueueSet::merge_bufferlists(PtrQueueSet *src) { |
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265 assert(_cbl_mon == src->_cbl_mon, "Should share the same lock"); |
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266 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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267 if (_completed_buffers_tail == NULL) { |
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268 assert(_completed_buffers_head == NULL, "Well-formedness"); |
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269 _completed_buffers_head = src->_completed_buffers_head; |
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270 _completed_buffers_tail = src->_completed_buffers_tail; |
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271 } else { |
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272 assert(_completed_buffers_head != NULL, "Well formedness"); |
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273 if (src->_completed_buffers_head != NULL) { |
| 1111 | 274 _completed_buffers_tail->set_next(src->_completed_buffers_head); |
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275 _completed_buffers_tail = src->_completed_buffers_tail; |
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276 } |
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277 } |
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278 _n_completed_buffers += src->_n_completed_buffers; |
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279 |
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280 src->_n_completed_buffers = 0; |
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281 src->_completed_buffers_head = NULL; |
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282 src->_completed_buffers_tail = NULL; |
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283 |
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284 assert(_completed_buffers_head == NULL && _completed_buffers_tail == NULL || |
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285 _completed_buffers_head != NULL && _completed_buffers_tail != NULL, |
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286 "Sanity"); |
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287 } |
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288 |
| 1111 | 289 void PtrQueueSet::notify_if_necessary() { |
| 290 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 291 if (_n_completed_buffers >= _process_completed_threshold || _max_completed_queue == 0) { | |
| 292 _process_completed = true; | |
| 293 if (_notify_when_complete) | |
| 294 _cbl_mon->notify(); | |
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616
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295 } |
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296 } |