Mercurial > hg > graal-jvmci-8
comparison src/share/vm/gc_implementation/g1/dirtyCardQueue.cpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 919e7959392a |
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189:0b27f3512f9e | 342:37f87013dfd8 |
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1 /* | |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_dirtyCardQueue.cpp.incl" | |
27 | |
28 bool DirtyCardQueue::apply_closure(CardTableEntryClosure* cl, | |
29 bool consume, | |
30 size_t worker_i) { | |
31 bool res = true; | |
32 if (_buf != NULL) { | |
33 res = apply_closure_to_buffer(cl, _buf, _index, _sz, | |
34 consume, | |
35 (int) worker_i); | |
36 if (res && consume) _index = _sz; | |
37 } | |
38 return res; | |
39 } | |
40 | |
41 bool DirtyCardQueue::apply_closure_to_buffer(CardTableEntryClosure* cl, | |
42 void** buf, | |
43 size_t index, size_t sz, | |
44 bool consume, | |
45 int worker_i) { | |
46 if (cl == NULL) return true; | |
47 for (size_t i = index; i < sz; i += oopSize) { | |
48 int ind = byte_index_to_index((int)i); | |
49 jbyte* card_ptr = (jbyte*)buf[ind]; | |
50 if (card_ptr != NULL) { | |
51 // Set the entry to null, so we don't do it again (via the test | |
52 // above) if we reconsider this buffer. | |
53 if (consume) buf[ind] = NULL; | |
54 if (!cl->do_card_ptr(card_ptr, worker_i)) return false; | |
55 } | |
56 } | |
57 return true; | |
58 } | |
59 | |
60 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
61 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
62 #endif // _MSC_VER | |
63 | |
64 DirtyCardQueueSet::DirtyCardQueueSet() : | |
65 PtrQueueSet(true /*notify_when_complete*/), | |
66 _closure(NULL), | |
67 _shared_dirty_card_queue(this, true /*perm*/), | |
68 _free_ids(NULL), | |
69 _processed_buffers_mut(0), _processed_buffers_rs_thread(0) | |
70 { | |
71 _all_active = true; | |
72 } | |
73 | |
74 size_t DirtyCardQueueSet::num_par_ids() { | |
75 return MAX2(ParallelGCThreads, (size_t)2); | |
76 } | |
77 | |
78 | |
79 void DirtyCardQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
80 int max_completed_queue, | |
81 Mutex* lock) { | |
82 PtrQueueSet::initialize(cbl_mon, fl_lock, max_completed_queue); | |
83 set_buffer_size(DCQBarrierQueueBufferSize); | |
84 set_process_completed_threshold(DCQBarrierProcessCompletedThreshold); | |
85 | |
86 _shared_dirty_card_queue.set_lock(lock); | |
87 _free_ids = new FreeIdSet((int) num_par_ids(), _cbl_mon); | |
88 bool b = _free_ids->claim_perm_id(0); | |
89 guarantee(b, "Must reserve id zero for concurrent refinement thread."); | |
90 } | |
91 | |
92 void DirtyCardQueueSet::handle_zero_index_for_thread(JavaThread* t) { | |
93 t->dirty_card_queue().handle_zero_index(); | |
94 } | |
95 | |
96 void DirtyCardQueueSet::set_closure(CardTableEntryClosure* closure) { | |
97 _closure = closure; | |
98 } | |
99 | |
100 void DirtyCardQueueSet::iterate_closure_all_threads(bool consume, | |
101 size_t worker_i) { | |
102 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
103 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
104 bool b = t->dirty_card_queue().apply_closure(_closure, consume); | |
105 guarantee(b, "Should not be interrupted."); | |
106 } | |
107 bool b = shared_dirty_card_queue()->apply_closure(_closure, | |
108 consume, | |
109 worker_i); | |
110 guarantee(b, "Should not be interrupted."); | |
111 } | |
112 | |
113 bool DirtyCardQueueSet::mut_process_buffer(void** buf) { | |
114 | |
115 // Used to determine if we had already claimed a par_id | |
116 // before entering this method. | |
117 bool already_claimed = false; | |
118 | |
119 // We grab the current JavaThread. | |
120 JavaThread* thread = JavaThread::current(); | |
121 | |
122 // We get the the number of any par_id that this thread | |
123 // might have already claimed. | |
124 int worker_i = thread->get_claimed_par_id(); | |
125 | |
126 // If worker_i is not -1 then the thread has already claimed | |
127 // a par_id. We make note of it using the already_claimed value | |
128 if (worker_i != -1) { | |
129 already_claimed = true; | |
130 } else { | |
131 | |
132 // Otherwise we need to claim a par id | |
133 worker_i = _free_ids->claim_par_id(); | |
134 | |
135 // And store the par_id value in the thread | |
136 thread->set_claimed_par_id(worker_i); | |
137 } | |
138 | |
139 bool b = false; | |
140 if (worker_i != -1) { | |
141 b = DirtyCardQueue::apply_closure_to_buffer(_closure, buf, 0, | |
142 _sz, true, worker_i); | |
143 if (b) Atomic::inc(&_processed_buffers_mut); | |
144 | |
145 // If we had not claimed an id before entering the method | |
146 // then we must release the id. | |
147 if (!already_claimed) { | |
148 | |
149 // we release the id | |
150 _free_ids->release_par_id(worker_i); | |
151 | |
152 // and set the claimed_id in the thread to -1 | |
153 thread->set_claimed_par_id(-1); | |
154 } | |
155 } | |
156 return b; | |
157 } | |
158 | |
159 DirtyCardQueueSet::CompletedBufferNode* | |
160 DirtyCardQueueSet::get_completed_buffer_lock(int stop_at) { | |
161 CompletedBufferNode* nd = NULL; | |
162 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
163 | |
164 if ((int)_n_completed_buffers <= stop_at) { | |
165 _process_completed = false; | |
166 return NULL; | |
167 } | |
168 | |
169 if (_completed_buffers_head != NULL) { | |
170 nd = _completed_buffers_head; | |
171 _completed_buffers_head = nd->next; | |
172 if (_completed_buffers_head == NULL) | |
173 _completed_buffers_tail = NULL; | |
174 _n_completed_buffers--; | |
175 } | |
176 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
177 return nd; | |
178 } | |
179 | |
180 // We only do this in contexts where there is no concurrent enqueueing. | |
181 DirtyCardQueueSet::CompletedBufferNode* | |
182 DirtyCardQueueSet::get_completed_buffer_CAS() { | |
183 CompletedBufferNode* nd = _completed_buffers_head; | |
184 | |
185 while (nd != NULL) { | |
186 CompletedBufferNode* next = nd->next; | |
187 CompletedBufferNode* result = | |
188 (CompletedBufferNode*)Atomic::cmpxchg_ptr(next, | |
189 &_completed_buffers_head, | |
190 nd); | |
191 if (result == nd) { | |
192 return result; | |
193 } else { | |
194 nd = _completed_buffers_head; | |
195 } | |
196 } | |
197 assert(_completed_buffers_head == NULL, "Loop post"); | |
198 _completed_buffers_tail = NULL; | |
199 return NULL; | |
200 } | |
201 | |
202 bool DirtyCardQueueSet:: | |
203 apply_closure_to_completed_buffer_helper(int worker_i, | |
204 CompletedBufferNode* nd) { | |
205 if (nd != NULL) { | |
206 bool b = | |
207 DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf, | |
208 nd->index, _sz, | |
209 true, worker_i); | |
210 void** buf = nd->buf; | |
211 delete nd; | |
212 if (b) { | |
213 deallocate_buffer(buf); | |
214 return true; // In normal case, go on to next buffer. | |
215 } else { | |
216 enqueue_complete_buffer(buf, nd->index, true); | |
217 return false; | |
218 } | |
219 } else { | |
220 return false; | |
221 } | |
222 } | |
223 | |
224 bool DirtyCardQueueSet::apply_closure_to_completed_buffer(int worker_i, | |
225 int stop_at, | |
226 bool with_CAS) | |
227 { | |
228 CompletedBufferNode* nd = NULL; | |
229 if (with_CAS) { | |
230 guarantee(stop_at == 0, "Precondition"); | |
231 nd = get_completed_buffer_CAS(); | |
232 } else { | |
233 nd = get_completed_buffer_lock(stop_at); | |
234 } | |
235 bool res = apply_closure_to_completed_buffer_helper(worker_i, nd); | |
236 if (res) _processed_buffers_rs_thread++; | |
237 return res; | |
238 } | |
239 | |
240 void DirtyCardQueueSet::apply_closure_to_all_completed_buffers() { | |
241 CompletedBufferNode* nd = _completed_buffers_head; | |
242 while (nd != NULL) { | |
243 bool b = | |
244 DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf, 0, _sz, | |
245 false); | |
246 guarantee(b, "Should not stop early."); | |
247 nd = nd->next; | |
248 } | |
249 } | |
250 | |
251 void DirtyCardQueueSet::abandon_logs() { | |
252 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
253 CompletedBufferNode* buffers_to_delete = NULL; | |
254 { | |
255 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
256 while (_completed_buffers_head != NULL) { | |
257 CompletedBufferNode* nd = _completed_buffers_head; | |
258 _completed_buffers_head = nd->next; | |
259 nd->next = buffers_to_delete; | |
260 buffers_to_delete = nd; | |
261 } | |
262 _n_completed_buffers = 0; | |
263 _completed_buffers_tail = NULL; | |
264 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
265 } | |
266 while (buffers_to_delete != NULL) { | |
267 CompletedBufferNode* nd = buffers_to_delete; | |
268 buffers_to_delete = nd->next; | |
269 deallocate_buffer(nd->buf); | |
270 delete nd; | |
271 } | |
272 // Since abandon is done only at safepoints, we can safely manipulate | |
273 // these queues. | |
274 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
275 t->dirty_card_queue().reset(); | |
276 } | |
277 shared_dirty_card_queue()->reset(); | |
278 } | |
279 | |
280 | |
281 void DirtyCardQueueSet::concatenate_logs() { | |
282 // Iterate over all the threads, if we find a partial log add it to | |
283 // the global list of logs. Temporarily turn off the limit on the number | |
284 // of outstanding buffers. | |
285 int save_max_completed_queue = _max_completed_queue; | |
286 _max_completed_queue = max_jint; | |
287 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
288 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
289 DirtyCardQueue& dcq = t->dirty_card_queue(); | |
290 if (dcq.size() != 0) { | |
291 void **buf = t->dirty_card_queue().get_buf(); | |
292 // We must NULL out the unused entries, then enqueue. | |
293 for (size_t i = 0; i < t->dirty_card_queue().get_index(); i += oopSize) { | |
294 buf[PtrQueue::byte_index_to_index((int)i)] = NULL; | |
295 } | |
296 enqueue_complete_buffer(dcq.get_buf(), dcq.get_index()); | |
297 dcq.reinitialize(); | |
298 } | |
299 } | |
300 if (_shared_dirty_card_queue.size() != 0) { | |
301 enqueue_complete_buffer(_shared_dirty_card_queue.get_buf(), | |
302 _shared_dirty_card_queue.get_index()); | |
303 _shared_dirty_card_queue.reinitialize(); | |
304 } | |
305 // Restore the completed buffer queue limit. | |
306 _max_completed_queue = save_max_completed_queue; | |
307 } |