Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/dirtyCardQueue.cpp @ 2951:0c0e407faa39
another fix to debug info (on-stack parameters), DCE removes unnecessary merges and LoopBegins whose LoopEnd went away
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 14 Jun 2011 16:47:31 +0200 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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342 | 1 /* |
1705 | 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/dirtyCardQueue.hpp" | |
27 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
28 #include "runtime/atomic.hpp" | |
29 #include "runtime/mutexLocker.hpp" | |
30 #include "runtime/safepoint.hpp" | |
31 #include "runtime/thread.hpp" | |
32 #include "utilities/workgroup.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "thread_linux.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_solaris | |
37 # include "thread_solaris.inline.hpp" | |
38 #endif | |
39 #ifdef TARGET_OS_FAMILY_windows | |
40 # include "thread_windows.inline.hpp" | |
41 #endif | |
342 | 42 |
43 bool DirtyCardQueue::apply_closure(CardTableEntryClosure* cl, | |
44 bool consume, | |
45 size_t worker_i) { | |
46 bool res = true; | |
47 if (_buf != NULL) { | |
48 res = apply_closure_to_buffer(cl, _buf, _index, _sz, | |
49 consume, | |
50 (int) worker_i); | |
51 if (res && consume) _index = _sz; | |
52 } | |
53 return res; | |
54 } | |
55 | |
56 bool DirtyCardQueue::apply_closure_to_buffer(CardTableEntryClosure* cl, | |
57 void** buf, | |
58 size_t index, size_t sz, | |
59 bool consume, | |
60 int worker_i) { | |
61 if (cl == NULL) return true; | |
62 for (size_t i = index; i < sz; i += oopSize) { | |
63 int ind = byte_index_to_index((int)i); | |
64 jbyte* card_ptr = (jbyte*)buf[ind]; | |
65 if (card_ptr != NULL) { | |
66 // Set the entry to null, so we don't do it again (via the test | |
67 // above) if we reconsider this buffer. | |
68 if (consume) buf[ind] = NULL; | |
69 if (!cl->do_card_ptr(card_ptr, worker_i)) return false; | |
70 } | |
71 } | |
72 return true; | |
73 } | |
74 | |
75 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
76 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
77 #endif // _MSC_VER | |
78 | |
1111 | 79 DirtyCardQueueSet::DirtyCardQueueSet(bool notify_when_complete) : |
80 PtrQueueSet(notify_when_complete), | |
342 | 81 _closure(NULL), |
82 _shared_dirty_card_queue(this, true /*perm*/), | |
83 _free_ids(NULL), | |
84 _processed_buffers_mut(0), _processed_buffers_rs_thread(0) | |
85 { | |
86 _all_active = true; | |
87 } | |
88 | |
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89 // Determines how many mutator threads can process the buffers in parallel. |
342 | 90 size_t DirtyCardQueueSet::num_par_ids() { |
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91 return os::processor_count(); |
342 | 92 } |
93 | |
94 void DirtyCardQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 95 int process_completed_threshold, |
342 | 96 int max_completed_queue, |
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97 Mutex* lock, PtrQueueSet* fl_owner) { |
1111 | 98 PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, |
99 max_completed_queue, fl_owner); | |
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100 set_buffer_size(G1UpdateBufferSize); |
342 | 101 _shared_dirty_card_queue.set_lock(lock); |
102 _free_ids = new FreeIdSet((int) num_par_ids(), _cbl_mon); | |
103 } | |
104 | |
105 void DirtyCardQueueSet::handle_zero_index_for_thread(JavaThread* t) { | |
106 t->dirty_card_queue().handle_zero_index(); | |
107 } | |
108 | |
109 void DirtyCardQueueSet::set_closure(CardTableEntryClosure* closure) { | |
110 _closure = closure; | |
111 } | |
112 | |
113 void DirtyCardQueueSet::iterate_closure_all_threads(bool consume, | |
114 size_t worker_i) { | |
115 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
116 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
117 bool b = t->dirty_card_queue().apply_closure(_closure, consume); | |
118 guarantee(b, "Should not be interrupted."); | |
119 } | |
120 bool b = shared_dirty_card_queue()->apply_closure(_closure, | |
121 consume, | |
122 worker_i); | |
123 guarantee(b, "Should not be interrupted."); | |
124 } | |
125 | |
126 bool DirtyCardQueueSet::mut_process_buffer(void** buf) { | |
127 | |
128 // Used to determine if we had already claimed a par_id | |
129 // before entering this method. | |
130 bool already_claimed = false; | |
131 | |
132 // We grab the current JavaThread. | |
133 JavaThread* thread = JavaThread::current(); | |
134 | |
135 // We get the the number of any par_id that this thread | |
136 // might have already claimed. | |
137 int worker_i = thread->get_claimed_par_id(); | |
138 | |
139 // If worker_i is not -1 then the thread has already claimed | |
140 // a par_id. We make note of it using the already_claimed value | |
141 if (worker_i != -1) { | |
142 already_claimed = true; | |
143 } else { | |
144 | |
145 // Otherwise we need to claim a par id | |
146 worker_i = _free_ids->claim_par_id(); | |
147 | |
148 // And store the par_id value in the thread | |
149 thread->set_claimed_par_id(worker_i); | |
150 } | |
151 | |
152 bool b = false; | |
153 if (worker_i != -1) { | |
154 b = DirtyCardQueue::apply_closure_to_buffer(_closure, buf, 0, | |
155 _sz, true, worker_i); | |
156 if (b) Atomic::inc(&_processed_buffers_mut); | |
157 | |
158 // If we had not claimed an id before entering the method | |
159 // then we must release the id. | |
160 if (!already_claimed) { | |
161 | |
162 // we release the id | |
163 _free_ids->release_par_id(worker_i); | |
164 | |
165 // and set the claimed_id in the thread to -1 | |
166 thread->set_claimed_par_id(-1); | |
167 } | |
168 } | |
169 return b; | |
170 } | |
171 | |
1111 | 172 |
173 BufferNode* | |
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174 DirtyCardQueueSet::get_completed_buffer(int stop_at) { |
1111 | 175 BufferNode* nd = NULL; |
342 | 176 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
177 | |
178 if ((int)_n_completed_buffers <= stop_at) { | |
179 _process_completed = false; | |
180 return NULL; | |
181 } | |
182 | |
183 if (_completed_buffers_head != NULL) { | |
184 nd = _completed_buffers_head; | |
1111 | 185 _completed_buffers_head = nd->next(); |
342 | 186 if (_completed_buffers_head == NULL) |
187 _completed_buffers_tail = NULL; | |
188 _n_completed_buffers--; | |
1111 | 189 assert(_n_completed_buffers >= 0, "Invariant"); |
342 | 190 } |
191 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
192 return nd; | |
193 } | |
194 | |
195 bool DirtyCardQueueSet:: | |
1705 | 196 apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl, |
197 int worker_i, | |
1111 | 198 BufferNode* nd) { |
342 | 199 if (nd != NULL) { |
1111 | 200 void **buf = BufferNode::make_buffer_from_node(nd); |
201 size_t index = nd->index(); | |
342 | 202 bool b = |
1705 | 203 DirtyCardQueue::apply_closure_to_buffer(cl, buf, |
1111 | 204 index, _sz, |
342 | 205 true, worker_i); |
206 if (b) { | |
207 deallocate_buffer(buf); | |
208 return true; // In normal case, go on to next buffer. | |
209 } else { | |
1111 | 210 enqueue_complete_buffer(buf, index); |
342 | 211 return false; |
212 } | |
213 } else { | |
214 return false; | |
215 } | |
216 } | |
217 | |
1705 | 218 bool DirtyCardQueueSet::apply_closure_to_completed_buffer(CardTableEntryClosure* cl, |
219 int worker_i, | |
220 int stop_at, | |
221 bool during_pause) { | |
222 assert(!during_pause || stop_at == 0, "Should not leave any completed buffers during a pause"); | |
223 BufferNode* nd = get_completed_buffer(stop_at); | |
224 bool res = apply_closure_to_completed_buffer_helper(cl, worker_i, nd); | |
225 if (res) Atomic::inc(&_processed_buffers_rs_thread); | |
226 return res; | |
227 } | |
228 | |
342 | 229 bool DirtyCardQueueSet::apply_closure_to_completed_buffer(int worker_i, |
230 int stop_at, | |
1705 | 231 bool during_pause) { |
232 return apply_closure_to_completed_buffer(_closure, worker_i, | |
233 stop_at, during_pause); | |
342 | 234 } |
235 | |
236 void DirtyCardQueueSet::apply_closure_to_all_completed_buffers() { | |
1111 | 237 BufferNode* nd = _completed_buffers_head; |
342 | 238 while (nd != NULL) { |
239 bool b = | |
1111 | 240 DirtyCardQueue::apply_closure_to_buffer(_closure, |
241 BufferNode::make_buffer_from_node(nd), | |
242 0, _sz, false); | |
342 | 243 guarantee(b, "Should not stop early."); |
1111 | 244 nd = nd->next(); |
342 | 245 } |
246 } | |
247 | |
1705 | 248 // Deallocates any completed log buffers |
249 void DirtyCardQueueSet::clear() { | |
1111 | 250 BufferNode* buffers_to_delete = NULL; |
342 | 251 { |
252 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
253 while (_completed_buffers_head != NULL) { | |
1111 | 254 BufferNode* nd = _completed_buffers_head; |
255 _completed_buffers_head = nd->next(); | |
256 nd->set_next(buffers_to_delete); | |
342 | 257 buffers_to_delete = nd; |
258 } | |
259 _n_completed_buffers = 0; | |
260 _completed_buffers_tail = NULL; | |
261 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
262 } | |
263 while (buffers_to_delete != NULL) { | |
1111 | 264 BufferNode* nd = buffers_to_delete; |
265 buffers_to_delete = nd->next(); | |
266 deallocate_buffer(BufferNode::make_buffer_from_node(nd)); | |
342 | 267 } |
1705 | 268 |
269 } | |
270 | |
271 void DirtyCardQueueSet::abandon_logs() { | |
272 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
273 clear(); | |
342 | 274 // Since abandon is done only at safepoints, we can safely manipulate |
275 // these queues. | |
276 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
277 t->dirty_card_queue().reset(); | |
278 } | |
279 shared_dirty_card_queue()->reset(); | |
280 } | |
281 | |
282 | |
283 void DirtyCardQueueSet::concatenate_logs() { | |
284 // Iterate over all the threads, if we find a partial log add it to | |
285 // the global list of logs. Temporarily turn off the limit on the number | |
286 // of outstanding buffers. | |
287 int save_max_completed_queue = _max_completed_queue; | |
288 _max_completed_queue = max_jint; | |
289 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
290 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
291 DirtyCardQueue& dcq = t->dirty_card_queue(); | |
292 if (dcq.size() != 0) { | |
293 void **buf = t->dirty_card_queue().get_buf(); | |
294 // We must NULL out the unused entries, then enqueue. | |
295 for (size_t i = 0; i < t->dirty_card_queue().get_index(); i += oopSize) { | |
296 buf[PtrQueue::byte_index_to_index((int)i)] = NULL; | |
297 } | |
298 enqueue_complete_buffer(dcq.get_buf(), dcq.get_index()); | |
299 dcq.reinitialize(); | |
300 } | |
301 } | |
302 if (_shared_dirty_card_queue.size() != 0) { | |
303 enqueue_complete_buffer(_shared_dirty_card_queue.get_buf(), | |
304 _shared_dirty_card_queue.get_index()); | |
305 _shared_dirty_card_queue.reinitialize(); | |
306 } | |
307 // Restore the completed buffer queue limit. | |
308 _max_completed_queue = save_max_completed_queue; | |
309 } |