Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 10355:fb14e9ed1594
8011064: Some tests have failed with SIGSEGV on arm-hflt on build b82
Summary: NMT_detail is only supported when frame pointers are not omitted (-fno-omit-frame-pointer).
Reviewed-by: dholmes, cjplummer
author | jprovino |
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date | Tue, 28 May 2013 11:32:46 -0400 |
parents | fbca7eaeac2e |
children | 1f4355cee9a2 16b10327b00d |
rev | line source |
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6197 | 1 /* |
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
6197 | 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 #include "precompiled.hpp" | |
25 | |
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26 #include "oops/instanceKlass.hpp" |
6197 | 27 #include "runtime/atomic.hpp" |
28 #include "runtime/interfaceSupport.hpp" | |
29 #include "runtime/mutexLocker.hpp" | |
30 #include "runtime/safepoint.hpp" | |
31 #include "runtime/threadCritical.hpp" | |
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32 #include "runtime/vm_operations.hpp" |
6197 | 33 #include "services/memPtr.hpp" |
34 #include "services/memReporter.hpp" | |
35 #include "services/memTracker.hpp" | |
36 #include "utilities/decoder.hpp" | |
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37 #include "utilities/defaultStream.hpp" |
6197 | 38 #include "utilities/globalDefinitions.hpp" |
39 | |
40 bool NMT_track_callsite = false; | |
41 | |
42 // walk all 'known' threads at NMT sync point, and collect their recorders | |
43 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
44 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
45 if (thread->is_Java_thread()) { | |
46 JavaThread* javaThread = (JavaThread*)thread; | |
47 MemRecorder* recorder = javaThread->get_recorder(); | |
48 if (recorder != NULL) { | |
49 MemTracker::enqueue_pending_recorder(recorder); | |
50 javaThread->set_recorder(NULL); | |
51 } | |
52 } | |
53 _thread_count ++; | |
54 } | |
55 | |
56 | |
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57 MemRecorder* volatile MemTracker::_global_recorder = NULL; |
6197 | 58 MemSnapshot* MemTracker::_snapshot = NULL; |
59 MemBaseline MemTracker::_baseline; | |
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60 Mutex* MemTracker::_query_lock = NULL; |
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61 MemRecorder* volatile MemTracker::_merge_pending_queue = NULL; |
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62 MemRecorder* volatile MemTracker::_pooled_recorders = NULL; |
6197 | 63 MemTrackWorker* MemTracker::_worker_thread = NULL; |
64 int MemTracker::_sync_point_skip_count = 0; | |
65 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
66 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
67 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
68 int MemTracker::_thread_count = 255; | |
69 volatile jint MemTracker::_pooled_recorder_count = 0; | |
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70 volatile unsigned long MemTracker::_processing_generation = 0; |
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71 volatile bool MemTracker::_worker_thread_idle = false; |
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72 volatile bool MemTracker::_slowdown_calling_thread = false; |
6197 | 73 debug_only(intx MemTracker::_main_thread_tid = 0;) |
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74 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
6197 | 75 |
76 void MemTracker::init_tracking_options(const char* option_line) { | |
77 _tracking_level = NMT_off; | |
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78 if (strcmp(option_line, "=summary") == 0) { |
6197 | 79 _tracking_level = NMT_summary; |
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80 } else if (strcmp(option_line, "=detail") == 0) { |
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81 // detail relies on a stack-walking ability that may not |
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82 // be available depending on platform and/or compiler flags |
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83 if (PLATFORM_NMT_DETAIL_SUPPORTED) { |
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84 _tracking_level = NMT_detail; |
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85 } else { |
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86 jio_fprintf(defaultStream::error_stream(), |
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87 "NMT detail is not supported on this platform. Using NMT summary instead."); |
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88 _tracking_level = NMT_summary; |
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89 } |
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90 } else if (strcmp(option_line, "=off") != 0) { |
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91 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
6197 | 92 } |
93 } | |
94 | |
95 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
96 void MemTracker::bootstrap_single_thread() { | |
97 if (_tracking_level > NMT_off) { | |
98 assert(_state == NMT_uninited, "wrong state"); | |
99 | |
100 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
101 // handle the amount of malloc data without significantly impacting | |
102 // runtime performance when this flag is on. | |
103 if (UseMallocOnly) { | |
104 shutdown(NMT_use_malloc_only); | |
105 return; | |
106 } | |
107 | |
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108 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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109 if (_query_lock == NULL) { |
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110 shutdown(NMT_out_of_memory); |
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111 return; |
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112 } |
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113 |
6197 | 114 debug_only(_main_thread_tid = os::current_thread_id();) |
115 _state = NMT_bootstrapping_single_thread; | |
116 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
117 } | |
118 } | |
119 | |
120 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
121 void MemTracker::bootstrap_multi_thread() { | |
122 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
123 // create nmt lock for multi-thread execution | |
124 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
125 _state = NMT_bootstrapping_multi_thread; | |
126 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
127 } | |
128 } | |
129 | |
130 // fully start nmt | |
131 void MemTracker::start() { | |
132 // Native memory tracking is off from command line option | |
133 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
134 | |
135 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
136 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
137 | |
138 _snapshot = new (std::nothrow)MemSnapshot(); | |
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139 if (_snapshot != NULL) { |
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140 if (!_snapshot->out_of_memory() && start_worker(_snapshot)) { |
6197 | 141 _state = NMT_started; |
142 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
143 return; | |
144 } | |
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145 |
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146 delete _snapshot; |
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147 _snapshot = NULL; |
6197 | 148 } |
149 | |
150 // fail to start native memory tracking, shut it down | |
151 shutdown(NMT_initialization); | |
152 } | |
153 | |
154 /** | |
155 * Shutting down native memory tracking. | |
156 * We can not shutdown native memory tracking immediately, so we just | |
157 * setup shutdown pending flag, every native memory tracking component | |
158 * should orderly shut itself down. | |
159 * | |
160 * The shutdown sequences: | |
161 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
162 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
163 * MemTracker to final shutdown state. | |
164 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
165 * tracking level to off to complete shutdown. | |
166 */ | |
167 void MemTracker::shutdown(ShutdownReason reason) { | |
168 if (_tracking_level == NMT_off) return; | |
169 | |
170 if (_state <= NMT_bootstrapping_single_thread) { | |
171 // we still in single thread mode, there is not contention | |
172 _state = NMT_shutdown_pending; | |
173 _reason = reason; | |
174 } else { | |
175 // we want to know who initialized shutdown | |
176 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
177 (jint*)&_state, (jint)NMT_started)) { | |
178 _reason = reason; | |
179 } | |
180 } | |
181 } | |
182 | |
183 // final phase of shutdown | |
184 void MemTracker::final_shutdown() { | |
185 // delete all pending recorders and pooled recorders | |
186 delete_all_pending_recorders(); | |
187 delete_all_pooled_recorders(); | |
188 | |
189 { | |
190 // shared baseline and snapshot are the only objects needed to | |
191 // create query results | |
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192 MutexLockerEx locker(_query_lock, true); |
6197 | 193 // cleanup baseline data and snapshot |
194 _baseline.clear(); | |
195 delete _snapshot; | |
196 _snapshot = NULL; | |
197 } | |
198 | |
199 // shutdown shared decoder instance, since it is only | |
200 // used by native memory tracking so far. | |
201 Decoder::shutdown(); | |
202 | |
203 MemTrackWorker* worker = NULL; | |
204 { | |
205 ThreadCritical tc; | |
206 // can not delete worker inside the thread critical | |
207 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
208 worker = _worker_thread; | |
209 _worker_thread = NULL; | |
210 } | |
211 } | |
212 if (worker != NULL) { | |
213 delete worker; | |
214 } | |
215 _state = NMT_final_shutdown; | |
216 } | |
217 | |
218 // delete all pooled recorders | |
219 void MemTracker::delete_all_pooled_recorders() { | |
220 // free all pooled recorders | |
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221 MemRecorder* volatile cur_head = _pooled_recorders; |
6197 | 222 if (cur_head != NULL) { |
223 MemRecorder* null_ptr = NULL; | |
224 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
225 (void*)&_pooled_recorders, (void*)cur_head)) { | |
226 cur_head = _pooled_recorders; | |
227 } | |
228 if (cur_head != NULL) { | |
229 delete cur_head; | |
230 _pooled_recorder_count = 0; | |
231 } | |
232 } | |
233 } | |
234 | |
235 // delete all recorders in pending queue | |
236 void MemTracker::delete_all_pending_recorders() { | |
237 // free all pending recorders | |
238 MemRecorder* pending_head = get_pending_recorders(); | |
239 if (pending_head != NULL) { | |
240 delete pending_head; | |
241 } | |
242 } | |
243 | |
244 /* | |
245 * retrieve per-thread recorder of specified thread. | |
246 * if thread == NULL, it means global recorder | |
247 */ | |
248 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
249 if (shutdown_in_progress()) return NULL; | |
250 | |
251 MemRecorder* rc; | |
252 if (thread == NULL) { | |
253 rc = _global_recorder; | |
254 } else { | |
255 rc = thread->get_recorder(); | |
256 } | |
257 | |
258 if (rc != NULL && rc->is_full()) { | |
259 enqueue_pending_recorder(rc); | |
260 rc = NULL; | |
261 } | |
262 | |
263 if (rc == NULL) { | |
264 rc = get_new_or_pooled_instance(); | |
265 if (thread == NULL) { | |
266 _global_recorder = rc; | |
267 } else { | |
268 thread->set_recorder(rc); | |
269 } | |
270 } | |
271 return rc; | |
272 } | |
273 | |
274 /* | |
275 * get a per-thread recorder from pool, or create a new one if | |
276 * there is not one available. | |
277 */ | |
278 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
279 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
280 if (cur_head == NULL) { | |
281 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
282 if (rec == NULL || rec->out_of_memory()) { | |
283 shutdown(NMT_out_of_memory); | |
284 if (rec != NULL) { | |
285 delete rec; | |
286 rec = NULL; | |
287 } | |
288 } | |
289 return rec; | |
290 } else { | |
291 MemRecorder* next_head = cur_head->next(); | |
292 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
293 (void*)cur_head)) { | |
294 return get_new_or_pooled_instance(); | |
295 } | |
296 cur_head->set_next(NULL); | |
297 Atomic::dec(&_pooled_recorder_count); | |
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298 cur_head->set_generation(); |
6197 | 299 return cur_head; |
300 } | |
301 } | |
302 | |
303 /* | |
304 * retrieve all recorders in pending queue, and empty the queue | |
305 */ | |
306 MemRecorder* MemTracker::get_pending_recorders() { | |
307 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
308 MemRecorder* null_ptr = NULL; | |
309 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
310 (void*)cur_head)) { | |
311 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
312 } | |
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313 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
6197 | 314 return cur_head; |
315 } | |
316 | |
317 /* | |
318 * release a recorder to recorder pool. | |
319 */ | |
320 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
321 assert(rec != NULL, "null recorder"); | |
322 // we don't want to pool too many recorders | |
323 rec->set_next(NULL); | |
324 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
325 delete rec; | |
326 return; | |
327 } | |
328 | |
329 rec->clear(); | |
330 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
331 rec->set_next(cur_head); | |
332 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
333 (void*)cur_head)) { | |
334 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
335 rec->set_next(cur_head); | |
336 } | |
337 Atomic::inc(&_pooled_recorder_count); | |
338 } | |
339 | |
340 /* | |
341 * This is the most important method in whole nmt implementation. | |
342 * | |
343 * Create a memory record. | |
344 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
345 * still in single thread mode. | |
346 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
347 * to write to recorders to global recorder. | |
348 * 3. For JavaThreads that are not longer visible by safepoint, also | |
349 * need to take ThreadCritical and records are written to global | |
350 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
351 * 4. JavaThreads that are running in native state, have to transition | |
352 * to VM state before writing to per-thread recorders. | |
353 * 5. JavaThreads that are running in VM state do not need any lock and | |
354 * records are written to per-thread recorders. | |
355 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
356 * ThreadCritical to write to global recorder. | |
357 * | |
358 * Important note: | |
359 * NO LOCK should be taken inside ThreadCritical lock !!! | |
360 */ | |
361 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
362 size_t size, address pc, Thread* thread) { | |
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363 assert(addr != NULL, "Sanity check"); |
6197 | 364 if (!shutdown_in_progress()) { |
365 // single thread, we just write records direct to global recorder,' | |
366 // with any lock | |
367 if (_state == NMT_bootstrapping_single_thread) { | |
368 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
369 thread = NULL; | |
370 } else { | |
371 if (thread == NULL) { | |
372 // don't use Thread::current(), since it is possible that | |
373 // the calling thread has yet to attach to VM 'Thread', | |
374 // which will result assertion failure | |
375 thread = ThreadLocalStorage::thread(); | |
376 } | |
377 } | |
378 | |
379 if (thread != NULL) { | |
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380 // slow down all calling threads except NMT worker thread, so it |
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381 // can catch up. |
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382 if (_slowdown_calling_thread && thread != _worker_thread) { |
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383 os::yield_all(); |
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384 } |
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385 |
6197 | 386 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { |
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387 JavaThread* java_thread = (JavaThread*)thread; |
6231 | 388 JavaThreadState state = java_thread->thread_state(); |
389 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
390 // JavaThreads that are safepoint safe, can run through safepoint, | |
391 // so ThreadCritical is needed to ensure no threads at safepoint create | |
392 // new records while the records are being gathered and the sequence number is changing | |
393 ThreadCritical tc; | |
394 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
6197 | 395 } else { |
6231 | 396 create_record_in_recorder(addr, flags, size, pc, java_thread); |
6197 | 397 } |
398 } else { | |
399 // other threads, such as worker and watcher threads, etc. need to | |
400 // take ThreadCritical to write to global recorder | |
401 ThreadCritical tc; | |
402 create_record_in_recorder(addr, flags, size, pc, NULL); | |
403 } | |
404 } else { | |
405 if (_state == NMT_bootstrapping_single_thread) { | |
406 // single thread, no lock needed | |
407 create_record_in_recorder(addr, flags, size, pc, NULL); | |
408 } else { | |
409 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
410 // use native thread critical instead | |
411 ThreadCritical tc; | |
412 create_record_in_recorder(addr, flags, size, pc, NULL); | |
413 } | |
414 } | |
415 } | |
416 } | |
417 | |
418 // write a record to proper recorder. No lock can be taken from this method | |
419 // down. | |
420 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
6231 | 421 size_t size, address pc, JavaThread* thread) { |
6197 | 422 |
6231 | 423 MemRecorder* rc = get_thread_recorder(thread); |
6197 | 424 if (rc != NULL) { |
425 rc->record(addr, flags, size, pc); | |
426 } | |
427 } | |
428 | |
429 /** | |
430 * enqueue a recorder to pending queue | |
431 */ | |
432 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
433 assert(rec != NULL, "null recorder"); | |
434 | |
435 // we are shutting down, so just delete it | |
436 if (shutdown_in_progress()) { | |
437 rec->set_next(NULL); | |
438 delete rec; | |
439 return; | |
440 } | |
441 | |
442 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
443 rec->set_next(cur_head); | |
444 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
445 (void*)cur_head)) { | |
446 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
447 rec->set_next(cur_head); | |
448 } | |
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449 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
6197 | 450 } |
451 | |
452 /* | |
453 * The method is called at global safepoint | |
454 * during it synchronization process. | |
455 * 1. enqueue all JavaThreads' per-thread recorders | |
456 * 2. enqueue global recorder | |
457 * 3. retrieve all pending recorders | |
458 * 4. reset global sequence number generator | |
459 * 5. call worker's sync | |
460 */ | |
461 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
462 #define SAFE_SEQUENCE_THRESHOLD 30 | |
463 #define HIGH_GENERATION_THRESHOLD 60 | |
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464 #define MAX_RECORDER_THREAD_RATIO 30 |
6197 | 465 |
466 void MemTracker::sync() { | |
467 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
468 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
469 | |
470 // Some GC tests hit large number of safepoints in short period of time | |
471 // without meaningful activities. We should prevent going to | |
472 // sync point in these cases, which can potentially exhaust generation buffer. | |
473 // Here is the factots to determine if we should go into sync point: | |
474 // 1. not to overflow sequence number | |
475 // 2. if we are in danger to overflow generation buffer | |
476 // 3. how many safepoints we already skipped sync point | |
477 if (_state == NMT_started) { | |
478 // worker thread is not ready, no one can manage generation | |
479 // buffer, so skip this safepoint | |
480 if (_worker_thread == NULL) return; | |
481 | |
482 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
483 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
484 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
485 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
486 _sync_point_skip_count ++; | |
487 return; | |
488 } | |
489 } | |
490 _sync_point_skip_count = 0; | |
491 { | |
492 // This method is running at safepoint, with ThreadCritical lock, | |
493 // it should guarantee that NMT is fully sync-ed. | |
494 ThreadCritical tc; | |
6231 | 495 |
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496 SequenceGenerator::reset(); |
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497 |
6231 | 498 // walk all JavaThreads to collect recorders |
499 SyncThreadRecorderClosure stc; | |
500 Threads::threads_do(&stc); | |
501 | |
502 _thread_count = stc.get_thread_count(); | |
503 MemRecorder* pending_recorders = get_pending_recorders(); | |
504 | |
6197 | 505 if (_global_recorder != NULL) { |
506 _global_recorder->set_next(pending_recorders); | |
507 pending_recorders = _global_recorder; | |
508 _global_recorder = NULL; | |
509 } | |
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510 |
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511 // see if NMT has too many outstanding recorder instances, it usually |
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512 // means that worker thread is lagging behind in processing them. |
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513 if (!AutoShutdownNMT) { |
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514 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); |
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515 } |
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516 |
6197 | 517 // check _worker_thread with lock to avoid racing condition |
518 if (_worker_thread != NULL) { | |
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519 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
6197 | 520 } |
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521 |
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522 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
6197 | 523 } |
524 } | |
525 | |
526 // now, it is the time to shut whole things off | |
527 if (_state == NMT_final_shutdown) { | |
528 // walk all JavaThreads to delete all recorders | |
529 SyncThreadRecorderClosure stc; | |
530 Threads::threads_do(&stc); | |
531 // delete global recorder | |
532 { | |
533 ThreadCritical tc; | |
534 if (_global_recorder != NULL) { | |
535 delete _global_recorder; | |
536 _global_recorder = NULL; | |
537 } | |
538 } | |
6231 | 539 MemRecorder* pending_recorders = get_pending_recorders(); |
540 if (pending_recorders != NULL) { | |
541 delete pending_recorders; | |
542 } | |
543 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
544 // completely shutdown NMT | |
545 if (MemRecorder::_instance_count == 0) { | |
546 _state = NMT_shutdown; | |
547 _tracking_level = NMT_off; | |
548 } | |
6197 | 549 } |
550 } | |
551 | |
552 /* | |
553 * Start worker thread. | |
554 */ | |
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555 bool MemTracker::start_worker(MemSnapshot* snapshot) { |
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556 assert(_worker_thread == NULL && _snapshot != NULL, "Just Check"); |
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557 _worker_thread = new (std::nothrow) MemTrackWorker(snapshot); |
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558 if (_worker_thread == NULL) { |
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559 return false; |
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560 } else if (_worker_thread->has_error()) { |
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561 delete _worker_thread; |
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562 _worker_thread = NULL; |
6197 | 563 return false; |
564 } | |
565 _worker_thread->start(); | |
566 return true; | |
567 } | |
568 | |
569 /* | |
570 * We need to collect a JavaThread's per-thread recorder | |
571 * before it exits. | |
572 */ | |
573 void MemTracker::thread_exiting(JavaThread* thread) { | |
574 if (is_on()) { | |
575 MemRecorder* rec = thread->get_recorder(); | |
576 if (rec != NULL) { | |
577 enqueue_pending_recorder(rec); | |
578 thread->set_recorder(NULL); | |
579 } | |
580 } | |
581 } | |
582 | |
583 // baseline current memory snapshot | |
584 bool MemTracker::baseline() { | |
10148 | 585 MutexLocker lock(_query_lock); |
6197 | 586 MemSnapshot* snapshot = get_snapshot(); |
587 if (snapshot != NULL) { | |
588 return _baseline.baseline(*snapshot, false); | |
589 } | |
590 return false; | |
591 } | |
592 | |
593 // print memory usage from current snapshot | |
594 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
595 MemBaseline baseline; | |
10148 | 596 MutexLocker lock(_query_lock); |
6197 | 597 MemSnapshot* snapshot = get_snapshot(); |
598 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
599 BaselineReporter reporter(out, unit); | |
600 reporter.report_baseline(baseline, summary_only); | |
601 return true; | |
602 } | |
603 return false; | |
604 } | |
605 | |
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606 // Whitebox API for blocking until the current generation of NMT data has been merged |
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607 bool MemTracker::wbtest_wait_for_data_merge() { |
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608 // NMT can't be shutdown while we're holding _query_lock |
10148 | 609 MutexLocker lock(_query_lock); |
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610 assert(_worker_thread != NULL, "Invalid query"); |
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611 // the generation at query time, so NMT will spin till this generation is processed |
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612 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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613 unsigned long current_processing_generation = _processing_generation; |
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614 // if generation counter overflown |
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615 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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616 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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617 // spin |
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618 while (!shutdown_in_progress()) { |
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619 if (!generation_overflown) { |
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620 if (current_processing_generation > generation_at_query_time) { |
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621 return true; |
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622 } |
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623 } else { |
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624 assert(generations_to_wrap >= 0, "Sanity check"); |
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625 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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626 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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627 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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628 if (current_generations_to_wrap > generations_to_wrap && |
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629 current_processing_generation > generation_at_query_time) { |
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630 return true; |
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631 } |
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632 } |
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633 |
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634 // if worker thread is idle, but generation is not advancing, that means |
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635 // there is not safepoint to let NMT advance generation, force one. |
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636 if (_worker_thread_idle) { |
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637 VM_ForceSafepoint vfs; |
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638 VMThread::execute(&vfs); |
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639 } |
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640 MemSnapshot* snapshot = get_snapshot(); |
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641 if (snapshot == NULL) { |
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642 return false; |
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643 } |
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644 snapshot->wait(1000); |
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645 current_processing_generation = _processing_generation; |
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646 } |
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647 // We end up here if NMT is shutting down before our data has been merged |
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648 return false; |
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649 } |
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650 |
6197 | 651 // compare memory usage between current snapshot and baseline |
652 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
10148 | 653 MutexLocker lock(_query_lock); |
6197 | 654 if (_baseline.baselined()) { |
655 MemBaseline baseline; | |
656 MemSnapshot* snapshot = get_snapshot(); | |
657 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
658 BaselineReporter reporter(out, unit); | |
659 reporter.diff_baselines(baseline, _baseline, summary_only); | |
660 return true; | |
661 } | |
662 } | |
663 return false; | |
664 } | |
665 | |
666 #ifndef PRODUCT | |
667 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
668 int cur_len = 0; | |
669 char tmp[1024]; | |
670 address pc; | |
671 | |
672 while (cur_len < len) { | |
673 pc = os::get_caller_pc(toSkip + 1); | |
674 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
675 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
676 cur_len = (int)strlen(buf); | |
677 } else { | |
678 buf[cur_len] = '\0'; | |
679 break; | |
680 } | |
681 toSkip ++; | |
682 } | |
683 } | |
684 | |
685 void MemTracker::print_tracker_stats(outputStream* st) { | |
686 st->print_cr("\nMemory Tracker Stats:"); | |
687 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
688 st->print_cr("\tthead count = %d", _thread_count); | |
689 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
690 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
691 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
692 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
693 if (_worker_thread != NULL) { | |
694 st->print_cr("\tWorker thread:"); | |
695 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
696 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
697 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
698 } else { | |
699 st->print_cr("\tWorker thread is not started"); | |
700 } | |
701 st->print_cr(" "); | |
702 | |
703 if (_snapshot != NULL) { | |
704 _snapshot->print_snapshot_stats(st); | |
705 } else { | |
706 st->print_cr("No snapshot"); | |
707 } | |
708 } | |
709 #endif | |
710 |