Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
author | mgerdin |
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date | Thu, 09 Oct 2014 15:42:23 +0200 |
parents | 42c091d63c72 |
children | 7848fc12602b |
rev | line source |
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342 | 1 /* |
20731 | 2 * Copyright (c) 2001, 2014, 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) : |
20731 | 34 _qset(qset), _buf(NULL), _index(0), _sz(0), _active(active), |
342 | 35 _perm(perm), _lock(NULL) |
36 {} | |
37 | |
20731 | 38 PtrQueue::~PtrQueue() { |
39 assert(_perm || (_buf == NULL), "queue must be flushed before delete"); | |
40 } | |
41 | |
42 void PtrQueue::flush_impl() { | |
342 | 43 if (!_perm && _buf != NULL) { |
44 if (_index == _sz) { | |
45 // No work to do. | |
46 qset()->deallocate_buffer(_buf); | |
47 } else { | |
48 // We must NULL out the unused entries, then enqueue. | |
49 for (size_t i = 0; i < _index; i += oopSize) { | |
50 _buf[byte_index_to_index((int)i)] = NULL; | |
51 } | |
52 qset()->enqueue_complete_buffer(_buf); | |
53 } | |
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54 _buf = NULL; |
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55 _index = 0; |
342 | 56 } |
57 } | |
58 | |
59 | |
60 void PtrQueue::enqueue_known_active(void* ptr) { | |
61 assert(0 <= _index && _index <= _sz, "Invariant."); | |
62 assert(_index == 0 || _buf != NULL, "invariant"); | |
63 | |
64 while (_index == 0) { | |
65 handle_zero_index(); | |
66 } | |
1111 | 67 |
342 | 68 assert(_index > 0, "postcondition"); |
69 _index -= oopSize; | |
70 _buf[byte_index_to_index((int)_index)] = ptr; | |
71 assert(0 <= _index && _index <= _sz, "Invariant."); | |
72 } | |
73 | |
74 void PtrQueue::locking_enqueue_completed_buffer(void** buf) { | |
75 assert(_lock->owned_by_self(), "Required."); | |
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76 |
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77 // We have to unlock _lock (which may be Shared_DirtyCardQ_lock) before |
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78 // we acquire DirtyCardQ_CBL_mon inside enqeue_complete_buffer as they |
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79 // have the same rank and we may get the "possible deadlock" message |
342 | 80 _lock->unlock(); |
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81 |
342 | 82 qset()->enqueue_complete_buffer(buf); |
83 // We must relock only because the caller will unlock, for the normal | |
84 // case. | |
85 _lock->lock_without_safepoint_check(); | |
86 } | |
87 | |
88 | |
89 PtrQueueSet::PtrQueueSet(bool notify_when_complete) : | |
90 _max_completed_queue(0), | |
91 _cbl_mon(NULL), _fl_lock(NULL), | |
92 _notify_when_complete(notify_when_complete), | |
93 _sz(0), | |
94 _completed_buffers_head(NULL), | |
95 _completed_buffers_tail(NULL), | |
96 _n_completed_buffers(0), | |
97 _process_completed_threshold(0), _process_completed(false), | |
98 _buf_free_list(NULL), _buf_free_list_sz(0) | |
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99 { |
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100 _fl_owner = this; |
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101 } |
342 | 102 |
103 void** PtrQueueSet::allocate_buffer() { | |
104 assert(_sz > 0, "Didn't set a buffer size."); | |
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105 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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106 if (_fl_owner->_buf_free_list != NULL) { |
1111 | 107 void** res = BufferNode::make_buffer_from_node(_fl_owner->_buf_free_list); |
108 _fl_owner->_buf_free_list = _fl_owner->_buf_free_list->next(); | |
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109 _fl_owner->_buf_free_list_sz--; |
342 | 110 return res; |
111 } else { | |
1111 | 112 // Allocate space for the BufferNode in front of the buffer. |
6197 | 113 char *b = NEW_C_HEAP_ARRAY(char, _sz + BufferNode::aligned_size(), mtGC); |
1111 | 114 return BufferNode::make_buffer_from_block(b); |
342 | 115 } |
116 } | |
117 | |
118 void PtrQueueSet::deallocate_buffer(void** buf) { | |
119 assert(_sz > 0, "Didn't set a buffer size."); | |
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120 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
1111 | 121 BufferNode *node = BufferNode::make_node_from_buffer(buf); |
122 node->set_next(_fl_owner->_buf_free_list); | |
123 _fl_owner->_buf_free_list = node; | |
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124 _fl_owner->_buf_free_list_sz++; |
342 | 125 } |
126 | |
127 void PtrQueueSet::reduce_free_list() { | |
1111 | 128 assert(_fl_owner == this, "Free list reduction is allowed only for the owner"); |
342 | 129 // For now we'll adopt the strategy of deleting half. |
130 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); | |
131 size_t n = _buf_free_list_sz / 2; | |
132 while (n > 0) { | |
133 assert(_buf_free_list != NULL, "_buf_free_list_sz must be wrong."); | |
1111 | 134 void* b = BufferNode::make_block_from_node(_buf_free_list); |
135 _buf_free_list = _buf_free_list->next(); | |
6197 | 136 FREE_C_HEAP_ARRAY(char, b, mtGC); |
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137 _buf_free_list_sz --; |
342 | 138 n--; |
139 } | |
140 } | |
141 | |
1111 | 142 void PtrQueue::handle_zero_index() { |
2149 | 143 assert(_index == 0, "Precondition."); |
144 | |
1111 | 145 // This thread records the full buffer and allocates a new one (while |
146 // holding the lock if there is one). | |
147 if (_buf != NULL) { | |
2149 | 148 if (!should_enqueue_buffer()) { |
149 assert(_index > 0, "the buffer can only be re-used if it's not full"); | |
150 return; | |
151 } | |
152 | |
1111 | 153 if (_lock) { |
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154 assert(_lock->owned_by_self(), "Required."); |
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155 |
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156 // The current PtrQ may be the shared dirty card queue and |
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157 // may be being manipulated by more than one worker thread |
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158 // during a pause. Since the enqueuing of the completed |
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159 // buffer unlocks the Shared_DirtyCardQ_lock more than one |
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160 // worker thread can 'race' on reading the shared queue attributes |
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161 // (_buf and _index) and multiple threads can call into this |
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162 // routine for the same buffer. This will cause the completed |
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163 // buffer to be added to the CBL multiple times. |
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164 |
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165 // We "claim" the current buffer by caching value of _buf in |
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166 // a local and clearing the field while holding _lock. When |
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167 // _lock is released (while enqueueing the completed buffer) |
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168 // the thread that acquires _lock will skip this code, |
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169 // preventing the subsequent the multiple enqueue, and |
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170 // install a newly allocated buffer below. |
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171 |
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172 void** buf = _buf; // local pointer to completed buffer |
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173 _buf = NULL; // clear shared _buf field |
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174 |
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175 locking_enqueue_completed_buffer(buf); // enqueue completed buffer |
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176 |
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177 // While the current thread was enqueuing the buffer another thread |
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178 // may have a allocated a new buffer and inserted it into this pointer |
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179 // queue. If that happens then we just return so that the current |
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180 // thread doesn't overwrite the buffer allocated by the other thread |
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181 // and potentially losing some dirtied cards. |
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182 |
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183 if (_buf != NULL) return; |
1111 | 184 } else { |
185 if (qset()->process_or_enqueue_complete_buffer(_buf)) { | |
186 // Recycle the buffer. No allocation. | |
187 _sz = qset()->buffer_size(); | |
188 _index = _sz; | |
189 return; | |
190 } | |
191 } | |
192 } | |
193 // Reallocate the buffer | |
194 _buf = qset()->allocate_buffer(); | |
195 _sz = qset()->buffer_size(); | |
196 _index = _sz; | |
197 assert(0 <= _index && _index <= _sz, "Invariant."); | |
198 } | |
342 | 199 |
1111 | 200 bool PtrQueueSet::process_or_enqueue_complete_buffer(void** buf) { |
201 if (Thread::current()->is_Java_thread()) { | |
202 // We don't lock. It is fine to be epsilon-precise here. | |
203 if (_max_completed_queue == 0 || _max_completed_queue > 0 && | |
204 _n_completed_buffers >= _max_completed_queue + _completed_queue_padding) { | |
205 bool b = mut_process_buffer(buf); | |
206 if (b) { | |
207 // True here means that the buffer hasn't been deallocated and the caller may reuse it. | |
208 return true; | |
209 } | |
342 | 210 } |
1111 | 211 } |
212 // The buffer will be enqueued. The caller will have to get a new one. | |
213 enqueue_complete_buffer(buf); | |
214 return false; | |
215 } | |
342 | 216 |
1111 | 217 void PtrQueueSet::enqueue_complete_buffer(void** buf, size_t index) { |
218 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
219 BufferNode* cbn = BufferNode::new_from_buffer(buf); | |
220 cbn->set_index(index); | |
342 | 221 if (_completed_buffers_tail == NULL) { |
222 assert(_completed_buffers_head == NULL, "Well-formedness"); | |
223 _completed_buffers_head = cbn; | |
224 _completed_buffers_tail = cbn; | |
225 } else { | |
1111 | 226 _completed_buffers_tail->set_next(cbn); |
342 | 227 _completed_buffers_tail = cbn; |
228 } | |
229 _n_completed_buffers++; | |
230 | |
1111 | 231 if (!_process_completed && _process_completed_threshold >= 0 && |
794 | 232 _n_completed_buffers >= _process_completed_threshold) { |
342 | 233 _process_completed = true; |
234 if (_notify_when_complete) | |
1111 | 235 _cbl_mon->notify(); |
342 | 236 } |
237 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
238 } | |
239 | |
240 int PtrQueueSet::completed_buffers_list_length() { | |
241 int n = 0; | |
1111 | 242 BufferNode* cbn = _completed_buffers_head; |
342 | 243 while (cbn != NULL) { |
244 n++; | |
1111 | 245 cbn = cbn->next(); |
342 | 246 } |
247 return n; | |
248 } | |
249 | |
250 void PtrQueueSet::assert_completed_buffer_list_len_correct() { | |
251 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
252 assert_completed_buffer_list_len_correct_locked(); | |
253 } | |
254 | |
255 void PtrQueueSet::assert_completed_buffer_list_len_correct_locked() { | |
1111 | 256 guarantee(completed_buffers_list_length() == _n_completed_buffers, |
342 | 257 "Completed buffer length is wrong."); |
258 } | |
259 | |
260 void PtrQueueSet::set_buffer_size(size_t sz) { | |
261 assert(_sz == 0 && sz > 0, "Should be called only once."); | |
262 _sz = sz * oopSize; | |
263 } | |
264 | |
1111 | 265 // Merge lists of buffers. Notify the processing threads. |
266 // The source queue is emptied as a result. The queues | |
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267 // must share the monitor. |
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268 void PtrQueueSet::merge_bufferlists(PtrQueueSet *src) { |
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269 assert(_cbl_mon == src->_cbl_mon, "Should share the same lock"); |
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270 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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271 if (_completed_buffers_tail == NULL) { |
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272 assert(_completed_buffers_head == NULL, "Well-formedness"); |
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273 _completed_buffers_head = src->_completed_buffers_head; |
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274 _completed_buffers_tail = src->_completed_buffers_tail; |
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275 } else { |
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276 assert(_completed_buffers_head != NULL, "Well formedness"); |
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277 if (src->_completed_buffers_head != NULL) { |
1111 | 278 _completed_buffers_tail->set_next(src->_completed_buffers_head); |
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279 _completed_buffers_tail = src->_completed_buffers_tail; |
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280 } |
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281 } |
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282 _n_completed_buffers += src->_n_completed_buffers; |
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283 |
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284 src->_n_completed_buffers = 0; |
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285 src->_completed_buffers_head = NULL; |
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286 src->_completed_buffers_tail = NULL; |
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287 |
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288 assert(_completed_buffers_head == NULL && _completed_buffers_tail == NULL || |
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289 _completed_buffers_head != NULL && _completed_buffers_tail != NULL, |
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290 "Sanity"); |
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291 } |
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292 |
1111 | 293 void PtrQueueSet::notify_if_necessary() { |
294 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
295 if (_n_completed_buffers >= _process_completed_threshold || _max_completed_queue == 0) { | |
296 _process_completed = true; | |
297 if (_notify_when_complete) | |
298 _cbl_mon->notify(); | |
616
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299 } |
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300 } |