Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 1019:035d2e036a9b
6885041: G1: inconsistent thread dump
Summary: When G1 is enabled, thread dumps are inconsistent as the info for some of the G1 threads is not formatted properly.
Reviewed-by: ysr, johnc
author | tonyp |
---|---|
date | Fri, 02 Oct 2009 16:12:07 -0400 |
parents | bd02caa94611 |
children | 5f932a151fd4 |
rev | line source |
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342 | 1 /* |
844 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
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/_ptrQueue.cpp.incl" | |
27 | |
28 PtrQueue::PtrQueue(PtrQueueSet* qset_, bool perm) : | |
29 _qset(qset_), _buf(NULL), _index(0), _active(false), | |
30 _perm(perm), _lock(NULL) | |
31 {} | |
32 | |
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33 void PtrQueue::flush() { |
342 | 34 if (!_perm && _buf != NULL) { |
35 if (_index == _sz) { | |
36 // No work to do. | |
37 qset()->deallocate_buffer(_buf); | |
38 } else { | |
39 // We must NULL out the unused entries, then enqueue. | |
40 for (size_t i = 0; i < _index; i += oopSize) { | |
41 _buf[byte_index_to_index((int)i)] = NULL; | |
42 } | |
43 qset()->enqueue_complete_buffer(_buf); | |
44 } | |
441
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45 _buf = NULL; |
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46 _index = 0; |
342 | 47 } |
48 } | |
49 | |
50 | |
51 static int byte_index_to_index(int ind) { | |
52 assert((ind % oopSize) == 0, "Invariant."); | |
53 return ind / oopSize; | |
54 } | |
55 | |
56 static int index_to_byte_index(int byte_ind) { | |
57 return byte_ind * oopSize; | |
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 } | |
67 assert(_index > 0, "postcondition"); | |
68 | |
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."); | |
76 _lock->unlock(); | |
77 qset()->enqueue_complete_buffer(buf); | |
78 // We must relock only because the caller will unlock, for the normal | |
79 // case. | |
80 _lock->lock_without_safepoint_check(); | |
81 } | |
82 | |
83 | |
84 PtrQueueSet::PtrQueueSet(bool notify_when_complete) : | |
85 _max_completed_queue(0), | |
86 _cbl_mon(NULL), _fl_lock(NULL), | |
87 _notify_when_complete(notify_when_complete), | |
88 _sz(0), | |
89 _completed_buffers_head(NULL), | |
90 _completed_buffers_tail(NULL), | |
91 _n_completed_buffers(0), | |
92 _process_completed_threshold(0), _process_completed(false), | |
93 _buf_free_list(NULL), _buf_free_list_sz(0) | |
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94 { |
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95 _fl_owner = this; |
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96 } |
342 | 97 |
98 void** PtrQueueSet::allocate_buffer() { | |
99 assert(_sz > 0, "Didn't set a buffer size."); | |
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100 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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101 if (_fl_owner->_buf_free_list != NULL) { |
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102 void** res = _fl_owner->_buf_free_list; |
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103 _fl_owner->_buf_free_list = (void**)_fl_owner->_buf_free_list[0]; |
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104 _fl_owner->_buf_free_list_sz--; |
342 | 105 // Just override the next pointer with NULL, just in case we scan this part |
106 // of the buffer. | |
107 res[0] = NULL; | |
108 return res; | |
109 } else { | |
110 return NEW_C_HEAP_ARRAY(void*, _sz); | |
111 } | |
112 } | |
113 | |
114 void PtrQueueSet::deallocate_buffer(void** buf) { | |
115 assert(_sz > 0, "Didn't set a buffer size."); | |
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116 MutexLockerEx x(_fl_owner->_fl_lock, Mutex::_no_safepoint_check_flag); |
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117 buf[0] = (void*)_fl_owner->_buf_free_list; |
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118 _fl_owner->_buf_free_list = buf; |
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119 _fl_owner->_buf_free_list_sz++; |
342 | 120 } |
121 | |
122 void PtrQueueSet::reduce_free_list() { | |
123 // For now we'll adopt the strategy of deleting half. | |
124 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); | |
125 size_t n = _buf_free_list_sz / 2; | |
126 while (n > 0) { | |
127 assert(_buf_free_list != NULL, "_buf_free_list_sz must be wrong."); | |
128 void** head = _buf_free_list; | |
129 _buf_free_list = (void**)_buf_free_list[0]; | |
130 FREE_C_HEAP_ARRAY(void*,head); | |
131 n--; | |
132 } | |
133 } | |
134 | |
135 void PtrQueueSet::enqueue_complete_buffer(void** buf, size_t index, bool ignore_max_completed) { | |
136 // I use explicit locking here because there's a bailout in the middle. | |
137 _cbl_mon->lock_without_safepoint_check(); | |
138 | |
139 Thread* thread = Thread::current(); | |
140 assert( ignore_max_completed || | |
141 thread->is_Java_thread() || | |
142 SafepointSynchronize::is_at_safepoint(), | |
143 "invariant" ); | |
144 ignore_max_completed = ignore_max_completed || !thread->is_Java_thread(); | |
145 | |
146 if (!ignore_max_completed && _max_completed_queue > 0 && | |
147 _n_completed_buffers >= (size_t) _max_completed_queue) { | |
148 _cbl_mon->unlock(); | |
149 bool b = mut_process_buffer(buf); | |
150 if (b) { | |
151 deallocate_buffer(buf); | |
152 return; | |
153 } | |
154 | |
155 // Otherwise, go ahead and enqueue the buffer. Must reaquire the lock. | |
156 _cbl_mon->lock_without_safepoint_check(); | |
157 } | |
158 | |
159 // Here we still hold the _cbl_mon. | |
160 CompletedBufferNode* cbn = new CompletedBufferNode; | |
161 cbn->buf = buf; | |
162 cbn->next = NULL; | |
163 cbn->index = index; | |
164 if (_completed_buffers_tail == NULL) { | |
165 assert(_completed_buffers_head == NULL, "Well-formedness"); | |
166 _completed_buffers_head = cbn; | |
167 _completed_buffers_tail = cbn; | |
168 } else { | |
169 _completed_buffers_tail->next = cbn; | |
170 _completed_buffers_tail = cbn; | |
171 } | |
172 _n_completed_buffers++; | |
173 | |
174 if (!_process_completed && | |
794 | 175 _n_completed_buffers >= _process_completed_threshold) { |
342 | 176 _process_completed = true; |
177 if (_notify_when_complete) | |
178 _cbl_mon->notify_all(); | |
179 } | |
180 debug_only(assert_completed_buffer_list_len_correct_locked()); | |
181 _cbl_mon->unlock(); | |
182 } | |
183 | |
184 int PtrQueueSet::completed_buffers_list_length() { | |
185 int n = 0; | |
186 CompletedBufferNode* cbn = _completed_buffers_head; | |
187 while (cbn != NULL) { | |
188 n++; | |
189 cbn = cbn->next; | |
190 } | |
191 return n; | |
192 } | |
193 | |
194 void PtrQueueSet::assert_completed_buffer_list_len_correct() { | |
195 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
196 assert_completed_buffer_list_len_correct_locked(); | |
197 } | |
198 | |
199 void PtrQueueSet::assert_completed_buffer_list_len_correct_locked() { | |
200 guarantee((size_t)completed_buffers_list_length() == _n_completed_buffers, | |
201 "Completed buffer length is wrong."); | |
202 } | |
203 | |
204 void PtrQueueSet::set_buffer_size(size_t sz) { | |
205 assert(_sz == 0 && sz > 0, "Should be called only once."); | |
206 _sz = sz * oopSize; | |
207 } | |
208 | |
209 void PtrQueueSet::set_process_completed_threshold(size_t sz) { | |
210 _process_completed_threshold = sz; | |
211 } | |
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212 |
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213 // Merge lists of buffers. Notify waiting threads if the length of the list |
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214 // exceeds threshold. The source queue is emptied as a result. The queues |
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215 // must share the monitor. |
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216 void PtrQueueSet::merge_bufferlists(PtrQueueSet *src) { |
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217 assert(_cbl_mon == src->_cbl_mon, "Should share the same lock"); |
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218 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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219 if (_completed_buffers_tail == NULL) { |
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220 assert(_completed_buffers_head == NULL, "Well-formedness"); |
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221 _completed_buffers_head = src->_completed_buffers_head; |
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222 _completed_buffers_tail = src->_completed_buffers_tail; |
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223 } else { |
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224 assert(_completed_buffers_head != NULL, "Well formedness"); |
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225 if (src->_completed_buffers_head != NULL) { |
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226 _completed_buffers_tail->next = src->_completed_buffers_head; |
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227 _completed_buffers_tail = src->_completed_buffers_tail; |
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228 } |
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229 } |
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230 _n_completed_buffers += src->_n_completed_buffers; |
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231 |
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232 src->_n_completed_buffers = 0; |
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233 src->_completed_buffers_head = NULL; |
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234 src->_completed_buffers_tail = NULL; |
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235 |
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236 assert(_completed_buffers_head == NULL && _completed_buffers_tail == NULL || |
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237 _completed_buffers_head != NULL && _completed_buffers_tail != NULL, |
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238 "Sanity"); |
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239 |
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240 if (!_process_completed && |
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241 _n_completed_buffers >= _process_completed_threshold) { |
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242 _process_completed = true; |
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243 if (_notify_when_complete) |
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244 _cbl_mon->notify_all(); |
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245 } |
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246 } |
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247 |
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248 // Merge free lists of the two queues. The free list of the source |
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249 // queue is emptied as a result. The queues must share the same |
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250 // mutex that guards free lists. |
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251 void PtrQueueSet::merge_freelists(PtrQueueSet* src) { |
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252 assert(_fl_lock == src->_fl_lock, "Should share the same lock"); |
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253 MutexLockerEx x(_fl_lock, Mutex::_no_safepoint_check_flag); |
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254 if (_buf_free_list != NULL) { |
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255 void **p = _buf_free_list; |
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256 while (*p != NULL) { |
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257 p = (void**)*p; |
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258 } |
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259 *p = src->_buf_free_list; |
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260 } else { |
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261 _buf_free_list = src->_buf_free_list; |
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262 } |
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263 _buf_free_list_sz += src->_buf_free_list_sz; |
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264 src->_buf_free_list = NULL; |
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265 src->_buf_free_list_sz = 0; |
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266 } |