Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 6842:b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp
| author | mikael |
|---|---|
| date | Tue, 09 Oct 2012 10:09:34 -0700 |
| parents | d2a62e0f25eb |
| children | f34d701e952e |
| 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" | |
| 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 | |
| 3960 | 40 #ifdef TARGET_OS_FAMILY_bsd |
| 41 # include "thread_bsd.inline.hpp" | |
| 42 #endif | |
| 342 | 43 |
| 2149 | 44 PtrQueue::PtrQueue(PtrQueueSet* qset, bool perm, bool active) : |
| 45 _qset(qset), _buf(NULL), _index(0), _active(active), | |
| 342 | 46 _perm(perm), _lock(NULL) |
| 47 {} | |
| 48 | |
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49 void PtrQueue::flush() { |
| 342 | 50 if (!_perm && _buf != NULL) { |
| 51 if (_index == _sz) { | |
| 52 // No work to do. | |
| 53 qset()->deallocate_buffer(_buf); | |
| 54 } else { | |
| 55 // We must NULL out the unused entries, then enqueue. | |
| 56 for (size_t i = 0; i < _index; i += oopSize) { | |
| 57 _buf[byte_index_to_index((int)i)] = NULL; | |
| 58 } | |
| 59 qset()->enqueue_complete_buffer(_buf); | |
| 60 } | |
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61 _buf = NULL; |
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62 _index = 0; |
| 342 | 63 } |
| 64 } | |
| 65 | |
| 66 | |
| 67 static int byte_index_to_index(int ind) { | |
| 68 assert((ind % oopSize) == 0, "Invariant."); | |
| 69 return ind / oopSize; | |
| 70 } | |
| 71 | |
| 72 static int index_to_byte_index(int byte_ind) { | |
| 73 return byte_ind * oopSize; | |
| 74 } | |
| 75 | |
| 76 void PtrQueue::enqueue_known_active(void* ptr) { | |
| 77 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 78 assert(_index == 0 || _buf != NULL, "invariant"); | |
| 79 | |
| 80 while (_index == 0) { | |
| 81 handle_zero_index(); | |
| 82 } | |
| 1111 | 83 |
| 342 | 84 assert(_index > 0, "postcondition"); |
| 85 _index -= oopSize; | |
| 86 _buf[byte_index_to_index((int)_index)] = ptr; | |
| 87 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 88 } | |
| 89 | |
| 90 void PtrQueue::locking_enqueue_completed_buffer(void** buf) { | |
| 91 assert(_lock->owned_by_self(), "Required."); | |
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92 |
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93 // We have to unlock _lock (which may be Shared_DirtyCardQ_lock) before |
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94 // we acquire DirtyCardQ_CBL_mon inside enqeue_complete_buffer as they |
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95 // have the same rank and we may get the "possible deadlock" message |
| 342 | 96 _lock->unlock(); |
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97 |
| 342 | 98 qset()->enqueue_complete_buffer(buf); |
| 99 // We must relock only because the caller will unlock, for the normal | |
| 100 // case. | |
| 101 _lock->lock_without_safepoint_check(); | |
| 102 } | |
| 103 | |
| 104 | |
| 105 PtrQueueSet::PtrQueueSet(bool notify_when_complete) : | |
| 106 _max_completed_queue(0), | |
| 107 _cbl_mon(NULL), _fl_lock(NULL), | |
| 108 _notify_when_complete(notify_when_complete), | |
| 109 _sz(0), | |
| 110 _completed_buffers_head(NULL), | |
| 111 _completed_buffers_tail(NULL), | |
| 112 _n_completed_buffers(0), | |
| 113 _process_completed_threshold(0), _process_completed(false), | |
| 114 _buf_free_list(NULL), _buf_free_list_sz(0) | |
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115 { |
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116 _fl_owner = this; |
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117 } |
| 342 | 118 |
| 119 void** PtrQueueSet::allocate_buffer() { | |
| 120 assert(_sz > 0, "Didn't set a buffer size."); | |
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121 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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122 if (_fl_owner->_buf_free_list != NULL) { |
| 1111 | 123 void** res = BufferNode::make_buffer_from_node(_fl_owner->_buf_free_list); |
| 124 _fl_owner->_buf_free_list = _fl_owner->_buf_free_list->next(); | |
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125 _fl_owner->_buf_free_list_sz--; |
| 342 | 126 return res; |
| 127 } else { | |
| 1111 | 128 // Allocate space for the BufferNode in front of the buffer. |
| 6197 | 129 char *b = NEW_C_HEAP_ARRAY(char, _sz + BufferNode::aligned_size(), mtGC); |
| 1111 | 130 return BufferNode::make_buffer_from_block(b); |
| 342 | 131 } |
| 132 } | |
| 133 | |
| 134 void PtrQueueSet::deallocate_buffer(void** buf) { | |
| 135 assert(_sz > 0, "Didn't set a buffer size."); | |
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136 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
| 1111 | 137 BufferNode *node = BufferNode::make_node_from_buffer(buf); |
| 138 node->set_next(_fl_owner->_buf_free_list); | |
| 139 _fl_owner->_buf_free_list = node; | |
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140 _fl_owner->_buf_free_list_sz++; |
| 342 | 141 } |
| 142 | |
| 143 void PtrQueueSet::reduce_free_list() { | |
| 1111 | 144 assert(_fl_owner == this, "Free list reduction is allowed only for the owner"); |
| 342 | 145 // For now we'll adopt the strategy of deleting half. |
| 146 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); | |
| 147 size_t n = _buf_free_list_sz / 2; | |
| 148 while (n > 0) { | |
| 149 assert(_buf_free_list != NULL, "_buf_free_list_sz must be wrong."); | |
| 1111 | 150 void* b = BufferNode::make_block_from_node(_buf_free_list); |
| 151 _buf_free_list = _buf_free_list->next(); | |
| 6197 | 152 FREE_C_HEAP_ARRAY(char, b, mtGC); |
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153 _buf_free_list_sz --; |
| 342 | 154 n--; |
| 155 } | |
| 156 } | |
| 157 | |
| 1111 | 158 void PtrQueue::handle_zero_index() { |
| 2149 | 159 assert(_index == 0, "Precondition."); |
| 160 | |
| 1111 | 161 // This thread records the full buffer and allocates a new one (while |
| 162 // holding the lock if there is one). | |
| 163 if (_buf != NULL) { | |
| 2149 | 164 if (!should_enqueue_buffer()) { |
| 165 assert(_index > 0, "the buffer can only be re-used if it's not full"); | |
| 166 return; | |
| 167 } | |
| 168 | |
| 1111 | 169 if (_lock) { |
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170 assert(_lock->owned_by_self(), "Required."); |
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171 |
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172 // The current PtrQ may be the shared dirty card queue and |
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173 // may be being manipulated by more than one worker thread |
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174 // during a pause. Since the enqueuing of the completed |
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175 // buffer unlocks the Shared_DirtyCardQ_lock more than one |
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176 // worker thread can 'race' on reading the shared queue attributes |
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177 // (_buf and _index) and multiple threads can call into this |
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178 // routine for the same buffer. This will cause the completed |
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179 // buffer to be added to the CBL multiple times. |
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180 |
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181 // We "claim" the current buffer by caching value of _buf in |
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182 // a local and clearing the field while holding _lock. When |
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183 // _lock is released (while enqueueing the completed buffer) |
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184 // the thread that acquires _lock will skip this code, |
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185 // preventing the subsequent the multiple enqueue, and |
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186 // install a newly allocated buffer below. |
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187 |
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188 void** buf = _buf; // local pointer to completed buffer |
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189 _buf = NULL; // clear shared _buf field |
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190 |
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191 locking_enqueue_completed_buffer(buf); // enqueue completed buffer |
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192 |
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193 // While the current thread was enqueuing the buffer another thread |
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194 // may have a allocated a new buffer and inserted it into this pointer |
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195 // queue. If that happens then we just return so that the current |
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196 // thread doesn't overwrite the buffer allocated by the other thread |
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197 // and potentially losing some dirtied cards. |
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198 |
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199 if (_buf != NULL) return; |
| 1111 | 200 } else { |
| 201 if (qset()->process_or_enqueue_complete_buffer(_buf)) { | |
| 202 // Recycle the buffer. No allocation. | |
| 203 _sz = qset()->buffer_size(); | |
| 204 _index = _sz; | |
| 205 return; | |
| 206 } | |
| 207 } | |
| 208 } | |
| 209 // Reallocate the buffer | |
| 210 _buf = qset()->allocate_buffer(); | |
| 211 _sz = qset()->buffer_size(); | |
| 212 _index = _sz; | |
| 213 assert(0 <= _index && _index <= _sz, "Invariant."); | |
| 214 } | |
| 342 | 215 |
| 1111 | 216 bool PtrQueueSet::process_or_enqueue_complete_buffer(void** buf) { |
| 217 if (Thread::current()->is_Java_thread()) { | |
| 218 // We don't lock. It is fine to be epsilon-precise here. | |
| 219 if (_max_completed_queue == 0 || _max_completed_queue > 0 && | |
| 220 _n_completed_buffers >= _max_completed_queue + _completed_queue_padding) { | |
| 221 bool b = mut_process_buffer(buf); | |
| 222 if (b) { | |
| 223 // True here means that the buffer hasn't been deallocated and the caller may reuse it. | |
| 224 return true; | |
| 225 } | |
| 342 | 226 } |
| 1111 | 227 } |
| 228 // The buffer will be enqueued. The caller will have to get a new one. | |
| 229 enqueue_complete_buffer(buf); | |
| 230 return false; | |
| 231 } | |
| 342 | 232 |
| 1111 | 233 void PtrQueueSet::enqueue_complete_buffer(void** buf, size_t index) { |
| 234 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 235 BufferNode* cbn = BufferNode::new_from_buffer(buf); | |
| 236 cbn->set_index(index); | |
| 342 | 237 if (_completed_buffers_tail == NULL) { |
| 238 assert(_completed_buffers_head == NULL, "Well-formedness"); | |
| 239 _completed_buffers_head = cbn; | |
| 240 _completed_buffers_tail = cbn; | |
| 241 } else { | |
| 1111 | 242 _completed_buffers_tail->set_next(cbn); |
| 342 | 243 _completed_buffers_tail = cbn; |
| 244 } | |
| 245 _n_completed_buffers++; | |
| 246 | |
| 1111 | 247 if (!_process_completed && _process_completed_threshold >= 0 && |
| 794 | 248 _n_completed_buffers >= _process_completed_threshold) { |
| 342 | 249 _process_completed = true; |
| 250 if (_notify_when_complete) | |
| 1111 | 251 _cbl_mon->notify(); |
| 342 | 252 } |
| 253 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
| 254 } | |
| 255 | |
| 256 int PtrQueueSet::completed_buffers_list_length() { | |
| 257 int n = 0; | |
| 1111 | 258 BufferNode* cbn = _completed_buffers_head; |
| 342 | 259 while (cbn != NULL) { |
| 260 n++; | |
| 1111 | 261 cbn = cbn->next(); |
| 342 | 262 } |
| 263 return n; | |
| 264 } | |
| 265 | |
| 266 void PtrQueueSet::assert_completed_buffer_list_len_correct() { | |
| 267 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 268 assert_completed_buffer_list_len_correct_locked(); | |
| 269 } | |
| 270 | |
| 271 void PtrQueueSet::assert_completed_buffer_list_len_correct_locked() { | |
| 1111 | 272 guarantee(completed_buffers_list_length() == _n_completed_buffers, |
| 342 | 273 "Completed buffer length is wrong."); |
| 274 } | |
| 275 | |
| 276 void PtrQueueSet::set_buffer_size(size_t sz) { | |
| 277 assert(_sz == 0 && sz > 0, "Should be called only once."); | |
| 278 _sz = sz * oopSize; | |
| 279 } | |
| 280 | |
| 1111 | 281 // Merge lists of buffers. Notify the processing threads. |
| 282 // The source queue is emptied as a result. The queues | |
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283 // must share the monitor. |
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284 void PtrQueueSet::merge_bufferlists(PtrQueueSet *src) { |
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285 assert(_cbl_mon == src->_cbl_mon, "Should share the same lock"); |
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286 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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287 if (_completed_buffers_tail == NULL) { |
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288 assert(_completed_buffers_head == NULL, "Well-formedness"); |
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289 _completed_buffers_head = src->_completed_buffers_head; |
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290 _completed_buffers_tail = src->_completed_buffers_tail; |
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291 } else { |
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292 assert(_completed_buffers_head != NULL, "Well formedness"); |
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293 if (src->_completed_buffers_head != NULL) { |
| 1111 | 294 _completed_buffers_tail->set_next(src->_completed_buffers_head); |
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295 _completed_buffers_tail = src->_completed_buffers_tail; |
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296 } |
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297 } |
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298 _n_completed_buffers += src->_n_completed_buffers; |
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299 |
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300 src->_n_completed_buffers = 0; |
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301 src->_completed_buffers_head = NULL; |
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302 src->_completed_buffers_tail = NULL; |
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303 |
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304 assert(_completed_buffers_head == NULL && _completed_buffers_tail == NULL || |
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305 _completed_buffers_head != NULL && _completed_buffers_tail != NULL, |
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306 "Sanity"); |
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307 } |
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308 |
| 1111 | 309 void PtrQueueSet::notify_if_necessary() { |
| 310 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
| 311 if (_n_completed_buffers >= _process_completed_threshold || _max_completed_queue == 0) { | |
| 312 _process_completed = true; | |
| 313 if (_notify_when_complete) | |
| 314 _cbl_mon->notify(); | |
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315 } |
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316 } |