Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 7e37af9d69ef |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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" | |
| 31 #ifdef TARGET_OS_FAMILY_linux | |
| 32 # include "thread_linux.inline.hpp" | |
| 33 #endif | |
| 34 #ifdef TARGET_OS_FAMILY_solaris | |
| 35 # include "thread_solaris.inline.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_OS_FAMILY_windows | |
| 38 # include "thread_windows.inline.hpp" | |
| 39 #endif | |
| 342 | 40 |
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41 PtrQueue::PtrQueue(PtrQueueSet* qset_, bool perm, bool active) : |
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42 _qset(qset_), _buf(NULL), _index(0), _active(active), |
| 342 | 43 _perm(perm), _lock(NULL) |
| 44 {} | |
| 45 | |
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46 void PtrQueue::flush() { |
| 342 | 47 if (!_perm && _buf != NULL) { |
| 48 if (_index == _sz) { | |
| 49 // No work to do. | |
| 50 qset()->deallocate_buffer(_buf); | |
| 51 } else { | |
| 52 // We must NULL out the unused entries, then enqueue. | |
| 53 for (size_t i = 0; i < _index; i += oopSize) { | |
| 54 _buf[byte_index_to_index((int)i)] = NULL; | |
| 55 } | |
| 56 qset()->enqueue_complete_buffer(_buf); | |
| 57 } | |
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58 _buf = NULL; |
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59 _index = 0; |
| 342 | 60 } |
| 61 } | |
| 62 | |
| 63 | |
| 64 static int byte_index_to_index(int ind) { | |
| 65 assert((ind % oopSize) == 0, "Invariant."); | |
| 66 return ind / oopSize; | |
| 67 } | |
| 68 | |
| 69 static int index_to_byte_index(int byte_ind) { | |
| 70 return byte_ind * oopSize; | |
| 71 } | |
| 72 | |
| 73 void PtrQueue::enqueue_known_active(void* ptr) { | |
| 74 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 75 assert(_index == 0 || _buf != NULL, "invariant"); | |
| 76 | |
| 77 while (_index == 0) { | |
| 78 handle_zero_index(); | |
| 79 } | |
| 1111 | 80 |
| 342 | 81 assert(_index > 0, "postcondition"); |
| 82 _index -= oopSize; | |
| 83 _buf[byte_index_to_index((int)_index)] = ptr; | |
| 84 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 85 } | |
| 86 | |
| 87 void PtrQueue::locking_enqueue_completed_buffer(void** buf) { | |
| 88 assert(_lock->owned_by_self(), "Required."); | |
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89 |
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90 // We have to unlock _lock (which may be Shared_DirtyCardQ_lock) before |
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91 // we acquire DirtyCardQ_CBL_mon inside enqeue_complete_buffer as they |
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92 // have the same rank and we may get the "possible deadlock" message |
| 342 | 93 _lock->unlock(); |
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94 |
| 342 | 95 qset()->enqueue_complete_buffer(buf); |
| 96 // We must relock only because the caller will unlock, for the normal | |
| 97 // case. | |
| 98 _lock->lock_without_safepoint_check(); | |
| 99 } | |
| 100 | |
| 101 | |
| 102 PtrQueueSet::PtrQueueSet(bool notify_when_complete) : | |
| 103 _max_completed_queue(0), | |
| 104 _cbl_mon(NULL), _fl_lock(NULL), | |
| 105 _notify_when_complete(notify_when_complete), | |
| 106 _sz(0), | |
| 107 _completed_buffers_head(NULL), | |
| 108 _completed_buffers_tail(NULL), | |
| 109 _n_completed_buffers(0), | |
| 110 _process_completed_threshold(0), _process_completed(false), | |
| 111 _buf_free_list(NULL), _buf_free_list_sz(0) | |
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112 { |
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113 _fl_owner = this; |
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114 } |
| 342 | 115 |
| 116 void** PtrQueueSet::allocate_buffer() { | |
| 117 assert(_sz > 0, "Didn't set a buffer size."); | |
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118 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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119 if (_fl_owner->_buf_free_list != NULL) { |
| 1111 | 120 void** res = BufferNode::make_buffer_from_node(_fl_owner->_buf_free_list); |
| 121 _fl_owner->_buf_free_list = _fl_owner->_buf_free_list->next(); | |
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122 _fl_owner->_buf_free_list_sz--; |
| 342 | 123 return res; |
| 124 } else { | |
| 1111 | 125 // Allocate space for the BufferNode in front of the buffer. |
| 126 char *b = NEW_C_HEAP_ARRAY(char, _sz + BufferNode::aligned_size()); | |
| 127 return BufferNode::make_buffer_from_block(b); | |
| 342 | 128 } |
| 129 } | |
| 130 | |
| 131 void PtrQueueSet::deallocate_buffer(void** buf) { | |
| 132 assert(_sz > 0, "Didn't set a buffer size."); | |
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133 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
| 1111 | 134 BufferNode *node = BufferNode::make_node_from_buffer(buf); |
| 135 node->set_next(_fl_owner->_buf_free_list); | |
| 136 _fl_owner->_buf_free_list = node; | |
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137 _fl_owner->_buf_free_list_sz++; |
| 342 | 138 } |
| 139 | |
| 140 void PtrQueueSet::reduce_free_list() { | |
| 1111 | 141 assert(_fl_owner == this, "Free list reduction is allowed only for the owner"); |
| 342 | 142 // For now we'll adopt the strategy of deleting half. |
| 143 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); | |
| 144 size_t n = _buf_free_list_sz / 2; | |
| 145 while (n > 0) { | |
| 146 assert(_buf_free_list != NULL, "_buf_free_list_sz must be wrong."); | |
| 1111 | 147 void* b = BufferNode::make_block_from_node(_buf_free_list); |
| 148 _buf_free_list = _buf_free_list->next(); | |
| 149 FREE_C_HEAP_ARRAY(char, b); | |
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150 _buf_free_list_sz --; |
| 342 | 151 n--; |
| 152 } | |
| 153 } | |
| 154 | |
| 1111 | 155 void PtrQueue::handle_zero_index() { |
| 156 assert(0 == _index, "Precondition."); | |
| 157 // This thread records the full buffer and allocates a new one (while | |
| 158 // holding the lock if there is one). | |
| 159 if (_buf != NULL) { | |
| 160 if (_lock) { | |
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161 assert(_lock->owned_by_self(), "Required."); |
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162 |
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163 // The current PtrQ may be the shared dirty card queue and |
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164 // may be being manipulated by more than one worker thread |
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165 // during a pause. Since the enqueuing of the completed |
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166 // buffer unlocks the Shared_DirtyCardQ_lock more than one |
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167 // worker thread can 'race' on reading the shared queue attributes |
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168 // (_buf and _index) and multiple threads can call into this |
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169 // routine for the same buffer. This will cause the completed |
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170 // buffer to be added to the CBL multiple times. |
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171 |
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172 // We "claim" the current buffer by caching value of _buf in |
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173 // a local and clearing the field while holding _lock. When |
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174 // _lock is released (while enqueueing the completed buffer) |
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175 // the thread that acquires _lock will skip this code, |
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176 // preventing the subsequent the multiple enqueue, and |
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177 // install a newly allocated buffer below. |
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178 |
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179 void** buf = _buf; // local pointer to completed buffer |
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180 _buf = NULL; // clear shared _buf field |
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181 |
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182 locking_enqueue_completed_buffer(buf); // enqueue completed buffer |
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183 |
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184 // While the current thread was enqueuing the buffer another thread |
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185 // may have a allocated a new buffer and inserted it into this pointer |
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186 // queue. If that happens then we just return so that the current |
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187 // thread doesn't overwrite the buffer allocated by the other thread |
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188 // and potentially losing some dirtied cards. |
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189 |
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190 if (_buf != NULL) return; |
| 1111 | 191 } else { |
| 192 if (qset()->process_or_enqueue_complete_buffer(_buf)) { | |
| 193 // Recycle the buffer. No allocation. | |
| 194 _sz = qset()->buffer_size(); | |
| 195 _index = _sz; | |
| 196 return; | |
| 197 } | |
| 198 } | |
| 199 } | |
| 200 // Reallocate the buffer | |
| 201 _buf = qset()->allocate_buffer(); | |
| 202 _sz = qset()->buffer_size(); | |
| 203 _index = _sz; | |
| 204 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 205 } | |
| 342 | 206 |
| 1111 | 207 bool PtrQueueSet::process_or_enqueue_complete_buffer(void** buf) { |
| 208 if (Thread::current()->is_Java_thread()) { | |
| 209 // We don't lock. It is fine to be epsilon-precise here. | |
| 210 if (_max_completed_queue == 0 || _max_completed_queue > 0 && | |
| 211 _n_completed_buffers >= _max_completed_queue + _completed_queue_padding) { | |
| 212 bool b = mut_process_buffer(buf); | |
| 213 if (b) { | |
| 214 // True here means that the buffer hasn't been deallocated and the caller may reuse it. | |
| 215 return true; | |
| 216 } | |
| 342 | 217 } |
| 1111 | 218 } |
| 219 // The buffer will be enqueued. The caller will have to get a new one. | |
| 220 enqueue_complete_buffer(buf); | |
| 221 return false; | |
| 222 } | |
| 342 | 223 |
| 1111 | 224 void PtrQueueSet::enqueue_complete_buffer(void** buf, size_t index) { |
| 225 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 226 BufferNode* cbn = BufferNode::new_from_buffer(buf); | |
| 227 cbn->set_index(index); | |
| 342 | 228 if (_completed_buffers_tail == NULL) { |
| 229 assert(_completed_buffers_head == NULL, "Well-formedness"); | |
| 230 _completed_buffers_head = cbn; | |
| 231 _completed_buffers_tail = cbn; | |
| 232 } else { | |
| 1111 | 233 _completed_buffers_tail->set_next(cbn); |
| 342 | 234 _completed_buffers_tail = cbn; |
| 235 } | |
| 236 _n_completed_buffers++; | |
| 237 | |
| 1111 | 238 if (!_process_completed && _process_completed_threshold >= 0 && |
| 794 | 239 _n_completed_buffers >= _process_completed_threshold) { |
| 342 | 240 _process_completed = true; |
| 241 if (_notify_when_complete) | |
| 1111 | 242 _cbl_mon->notify(); |
| 342 | 243 } |
| 244 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
| 245 } | |
| 246 | |
| 247 int PtrQueueSet::completed_buffers_list_length() { | |
| 248 int n = 0; | |
| 1111 | 249 BufferNode* cbn = _completed_buffers_head; |
| 342 | 250 while (cbn != NULL) { |
| 251 n++; | |
| 1111 | 252 cbn = cbn->next(); |
| 342 | 253 } |
| 254 return n; | |
| 255 } | |
| 256 | |
| 257 void PtrQueueSet::assert_completed_buffer_list_len_correct() { | |
| 258 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 259 assert_completed_buffer_list_len_correct_locked(); | |
| 260 } | |
| 261 | |
| 262 void PtrQueueSet::assert_completed_buffer_list_len_correct_locked() { | |
| 1111 | 263 guarantee(completed_buffers_list_length() == _n_completed_buffers, |
| 342 | 264 "Completed buffer length is wrong."); |
| 265 } | |
| 266 | |
| 267 void PtrQueueSet::set_buffer_size(size_t sz) { | |
| 268 assert(_sz == 0 && sz > 0, "Should be called only once."); | |
| 269 _sz = sz * oopSize; | |
| 270 } | |
| 271 | |
| 1111 | 272 // Merge lists of buffers. Notify the processing threads. |
| 273 // The source queue is emptied as a result. The queues | |
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274 // must share the monitor. |
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275 void PtrQueueSet::merge_bufferlists(PtrQueueSet *src) { |
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276 assert(_cbl_mon == src->_cbl_mon, "Should share the same lock"); |
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277 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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278 if (_completed_buffers_tail == NULL) { |
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279 assert(_completed_buffers_head == NULL, "Well-formedness"); |
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280 _completed_buffers_head = src->_completed_buffers_head; |
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281 _completed_buffers_tail = src->_completed_buffers_tail; |
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282 } else { |
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283 assert(_completed_buffers_head != NULL, "Well formedness"); |
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284 if (src->_completed_buffers_head != NULL) { |
| 1111 | 285 _completed_buffers_tail->set_next(src->_completed_buffers_head); |
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286 _completed_buffers_tail = src->_completed_buffers_tail; |
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287 } |
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288 } |
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289 _n_completed_buffers += src->_n_completed_buffers; |
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290 |
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291 src->_n_completed_buffers = 0; |
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292 src->_completed_buffers_head = NULL; |
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293 src->_completed_buffers_tail = NULL; |
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294 |
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295 assert(_completed_buffers_head == NULL && _completed_buffers_tail == NULL || |
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296 _completed_buffers_head != NULL && _completed_buffers_tail != NULL, |
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297 "Sanity"); |
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298 } |
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299 |
| 1111 | 300 void PtrQueueSet::notify_if_necessary() { |
| 301 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 302 if (_n_completed_buffers >= _process_completed_threshold || _max_completed_queue == 0) { | |
| 303 _process_completed = true; | |
| 304 if (_notify_when_complete) | |
| 305 _cbl_mon->notify(); | |
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306 } |
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307 } |