Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 8071:bbc7936779f9
8006398: Add regression tests for deprectated GCs
Reviewed-by: ehelin, jwilhelm, jmasa
author | brutisso |
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date | Thu, 14 Feb 2013 09:11:43 +0100 |
parents | 4102b59539ce |
children | 06db4c0afbf3 |
rev | line source |
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6197 | 1 /* |
2 * Copyright (c) 2012, Oracle and/or its affiliates. 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 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" | |
37 #include "utilities/globalDefinitions.hpp" | |
38 | |
39 bool NMT_track_callsite = false; | |
40 | |
41 // walk all 'known' threads at NMT sync point, and collect their recorders | |
42 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
43 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
44 if (thread->is_Java_thread()) { | |
45 JavaThread* javaThread = (JavaThread*)thread; | |
46 MemRecorder* recorder = javaThread->get_recorder(); | |
47 if (recorder != NULL) { | |
48 MemTracker::enqueue_pending_recorder(recorder); | |
49 javaThread->set_recorder(NULL); | |
50 } | |
51 } | |
52 _thread_count ++; | |
53 } | |
54 | |
55 | |
56 MemRecorder* MemTracker::_global_recorder = NULL; | |
57 MemSnapshot* MemTracker::_snapshot = NULL; | |
58 MemBaseline MemTracker::_baseline; | |
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59 Mutex* MemTracker::_query_lock = NULL; |
6197 | 60 volatile MemRecorder* MemTracker::_merge_pending_queue = NULL; |
61 volatile MemRecorder* MemTracker::_pooled_recorders = NULL; | |
62 MemTrackWorker* MemTracker::_worker_thread = NULL; | |
63 int MemTracker::_sync_point_skip_count = 0; | |
64 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
65 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
66 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
67 int MemTracker::_thread_count = 255; | |
68 volatile jint MemTracker::_pooled_recorder_count = 0; | |
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69 volatile unsigned long MemTracker::_processing_generation = 0; |
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70 volatile bool MemTracker::_worker_thread_idle = false; |
6197 | 71 debug_only(intx MemTracker::_main_thread_tid = 0;) |
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72 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
6197 | 73 |
74 void MemTracker::init_tracking_options(const char* option_line) { | |
75 _tracking_level = NMT_off; | |
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76 if (strcmp(option_line, "=summary") == 0) { |
6197 | 77 _tracking_level = NMT_summary; |
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78 } else if (strcmp(option_line, "=detail") == 0) { |
6197 | 79 _tracking_level = NMT_detail; |
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80 } else if (strcmp(option_line, "=off") != 0) { |
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81 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
6197 | 82 } |
83 } | |
84 | |
85 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
86 void MemTracker::bootstrap_single_thread() { | |
87 if (_tracking_level > NMT_off) { | |
88 assert(_state == NMT_uninited, "wrong state"); | |
89 | |
90 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
91 // handle the amount of malloc data without significantly impacting | |
92 // runtime performance when this flag is on. | |
93 if (UseMallocOnly) { | |
94 shutdown(NMT_use_malloc_only); | |
95 return; | |
96 } | |
97 | |
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98 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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99 if (_query_lock == NULL) { |
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100 shutdown(NMT_out_of_memory); |
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101 return; |
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102 } |
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103 |
6197 | 104 debug_only(_main_thread_tid = os::current_thread_id();) |
105 _state = NMT_bootstrapping_single_thread; | |
106 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
107 } | |
108 } | |
109 | |
110 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
111 void MemTracker::bootstrap_multi_thread() { | |
112 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
113 // create nmt lock for multi-thread execution | |
114 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
115 _state = NMT_bootstrapping_multi_thread; | |
116 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
117 } | |
118 } | |
119 | |
120 // fully start nmt | |
121 void MemTracker::start() { | |
122 // Native memory tracking is off from command line option | |
123 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
124 | |
125 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
126 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
127 | |
128 _snapshot = new (std::nothrow)MemSnapshot(); | |
129 if (_snapshot != NULL && !_snapshot->out_of_memory()) { | |
130 if (start_worker()) { | |
131 _state = NMT_started; | |
132 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
133 return; | |
134 } | |
135 } | |
136 | |
137 // fail to start native memory tracking, shut it down | |
138 shutdown(NMT_initialization); | |
139 } | |
140 | |
141 /** | |
142 * Shutting down native memory tracking. | |
143 * We can not shutdown native memory tracking immediately, so we just | |
144 * setup shutdown pending flag, every native memory tracking component | |
145 * should orderly shut itself down. | |
146 * | |
147 * The shutdown sequences: | |
148 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
149 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
150 * MemTracker to final shutdown state. | |
151 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
152 * tracking level to off to complete shutdown. | |
153 */ | |
154 void MemTracker::shutdown(ShutdownReason reason) { | |
155 if (_tracking_level == NMT_off) return; | |
156 | |
157 if (_state <= NMT_bootstrapping_single_thread) { | |
158 // we still in single thread mode, there is not contention | |
159 _state = NMT_shutdown_pending; | |
160 _reason = reason; | |
161 } else { | |
162 // we want to know who initialized shutdown | |
163 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
164 (jint*)&_state, (jint)NMT_started)) { | |
165 _reason = reason; | |
166 } | |
167 } | |
168 } | |
169 | |
170 // final phase of shutdown | |
171 void MemTracker::final_shutdown() { | |
172 // delete all pending recorders and pooled recorders | |
173 delete_all_pending_recorders(); | |
174 delete_all_pooled_recorders(); | |
175 | |
176 { | |
177 // shared baseline and snapshot are the only objects needed to | |
178 // create query results | |
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179 MutexLockerEx locker(_query_lock, true); |
6197 | 180 // cleanup baseline data and snapshot |
181 _baseline.clear(); | |
182 delete _snapshot; | |
183 _snapshot = NULL; | |
184 } | |
185 | |
186 // shutdown shared decoder instance, since it is only | |
187 // used by native memory tracking so far. | |
188 Decoder::shutdown(); | |
189 | |
190 MemTrackWorker* worker = NULL; | |
191 { | |
192 ThreadCritical tc; | |
193 // can not delete worker inside the thread critical | |
194 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
195 worker = _worker_thread; | |
196 _worker_thread = NULL; | |
197 } | |
198 } | |
199 if (worker != NULL) { | |
200 delete worker; | |
201 } | |
202 _state = NMT_final_shutdown; | |
203 } | |
204 | |
205 // delete all pooled recorders | |
206 void MemTracker::delete_all_pooled_recorders() { | |
207 // free all pooled recorders | |
208 volatile MemRecorder* cur_head = _pooled_recorders; | |
209 if (cur_head != NULL) { | |
210 MemRecorder* null_ptr = NULL; | |
211 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
212 (void*)&_pooled_recorders, (void*)cur_head)) { | |
213 cur_head = _pooled_recorders; | |
214 } | |
215 if (cur_head != NULL) { | |
216 delete cur_head; | |
217 _pooled_recorder_count = 0; | |
218 } | |
219 } | |
220 } | |
221 | |
222 // delete all recorders in pending queue | |
223 void MemTracker::delete_all_pending_recorders() { | |
224 // free all pending recorders | |
225 MemRecorder* pending_head = get_pending_recorders(); | |
226 if (pending_head != NULL) { | |
227 delete pending_head; | |
228 } | |
229 } | |
230 | |
231 /* | |
232 * retrieve per-thread recorder of specified thread. | |
233 * if thread == NULL, it means global recorder | |
234 */ | |
235 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
236 if (shutdown_in_progress()) return NULL; | |
237 | |
238 MemRecorder* rc; | |
239 if (thread == NULL) { | |
240 rc = _global_recorder; | |
241 } else { | |
242 rc = thread->get_recorder(); | |
243 } | |
244 | |
245 if (rc != NULL && rc->is_full()) { | |
246 enqueue_pending_recorder(rc); | |
247 rc = NULL; | |
248 } | |
249 | |
250 if (rc == NULL) { | |
251 rc = get_new_or_pooled_instance(); | |
252 if (thread == NULL) { | |
253 _global_recorder = rc; | |
254 } else { | |
255 thread->set_recorder(rc); | |
256 } | |
257 } | |
258 return rc; | |
259 } | |
260 | |
261 /* | |
262 * get a per-thread recorder from pool, or create a new one if | |
263 * there is not one available. | |
264 */ | |
265 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
266 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
267 if (cur_head == NULL) { | |
268 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
269 if (rec == NULL || rec->out_of_memory()) { | |
270 shutdown(NMT_out_of_memory); | |
271 if (rec != NULL) { | |
272 delete rec; | |
273 rec = NULL; | |
274 } | |
275 } | |
276 return rec; | |
277 } else { | |
278 MemRecorder* next_head = cur_head->next(); | |
279 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
280 (void*)cur_head)) { | |
281 return get_new_or_pooled_instance(); | |
282 } | |
283 cur_head->set_next(NULL); | |
284 Atomic::dec(&_pooled_recorder_count); | |
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285 cur_head->set_generation(); |
6197 | 286 return cur_head; |
287 } | |
288 } | |
289 | |
290 /* | |
291 * retrieve all recorders in pending queue, and empty the queue | |
292 */ | |
293 MemRecorder* MemTracker::get_pending_recorders() { | |
294 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
295 MemRecorder* null_ptr = NULL; | |
296 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
297 (void*)cur_head)) { | |
298 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
299 } | |
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300 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
6197 | 301 return cur_head; |
302 } | |
303 | |
304 /* | |
305 * release a recorder to recorder pool. | |
306 */ | |
307 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
308 assert(rec != NULL, "null recorder"); | |
309 // we don't want to pool too many recorders | |
310 rec->set_next(NULL); | |
311 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
312 delete rec; | |
313 return; | |
314 } | |
315 | |
316 rec->clear(); | |
317 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
318 rec->set_next(cur_head); | |
319 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
320 (void*)cur_head)) { | |
321 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
322 rec->set_next(cur_head); | |
323 } | |
324 Atomic::inc(&_pooled_recorder_count); | |
325 } | |
326 | |
327 /* | |
328 * This is the most important method in whole nmt implementation. | |
329 * | |
330 * Create a memory record. | |
331 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
332 * still in single thread mode. | |
333 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
334 * to write to recorders to global recorder. | |
335 * 3. For JavaThreads that are not longer visible by safepoint, also | |
336 * need to take ThreadCritical and records are written to global | |
337 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
338 * 4. JavaThreads that are running in native state, have to transition | |
339 * to VM state before writing to per-thread recorders. | |
340 * 5. JavaThreads that are running in VM state do not need any lock and | |
341 * records are written to per-thread recorders. | |
342 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
343 * ThreadCritical to write to global recorder. | |
344 * | |
345 * Important note: | |
346 * NO LOCK should be taken inside ThreadCritical lock !!! | |
347 */ | |
348 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
349 size_t size, address pc, Thread* thread) { | |
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350 assert(addr != NULL, "Sanity check"); |
6197 | 351 if (!shutdown_in_progress()) { |
352 // single thread, we just write records direct to global recorder,' | |
353 // with any lock | |
354 if (_state == NMT_bootstrapping_single_thread) { | |
355 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
356 thread = NULL; | |
357 } else { | |
358 if (thread == NULL) { | |
359 // don't use Thread::current(), since it is possible that | |
360 // the calling thread has yet to attach to VM 'Thread', | |
361 // which will result assertion failure | |
362 thread = ThreadLocalStorage::thread(); | |
363 } | |
364 } | |
365 | |
366 if (thread != NULL) { | |
367 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { | |
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368 JavaThread* java_thread = (JavaThread*)thread; |
6231 | 369 JavaThreadState state = java_thread->thread_state(); |
370 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
371 // JavaThreads that are safepoint safe, can run through safepoint, | |
372 // so ThreadCritical is needed to ensure no threads at safepoint create | |
373 // new records while the records are being gathered and the sequence number is changing | |
374 ThreadCritical tc; | |
375 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
6197 | 376 } else { |
6231 | 377 create_record_in_recorder(addr, flags, size, pc, java_thread); |
6197 | 378 } |
379 } else { | |
380 // other threads, such as worker and watcher threads, etc. need to | |
381 // take ThreadCritical to write to global recorder | |
382 ThreadCritical tc; | |
383 create_record_in_recorder(addr, flags, size, pc, NULL); | |
384 } | |
385 } else { | |
386 if (_state == NMT_bootstrapping_single_thread) { | |
387 // single thread, no lock needed | |
388 create_record_in_recorder(addr, flags, size, pc, NULL); | |
389 } else { | |
390 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
391 // use native thread critical instead | |
392 ThreadCritical tc; | |
393 create_record_in_recorder(addr, flags, size, pc, NULL); | |
394 } | |
395 } | |
396 } | |
397 } | |
398 | |
399 // write a record to proper recorder. No lock can be taken from this method | |
400 // down. | |
401 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
6231 | 402 size_t size, address pc, JavaThread* thread) { |
6197 | 403 |
6231 | 404 MemRecorder* rc = get_thread_recorder(thread); |
6197 | 405 if (rc != NULL) { |
406 rc->record(addr, flags, size, pc); | |
407 } | |
408 } | |
409 | |
410 /** | |
411 * enqueue a recorder to pending queue | |
412 */ | |
413 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
414 assert(rec != NULL, "null recorder"); | |
415 | |
416 // we are shutting down, so just delete it | |
417 if (shutdown_in_progress()) { | |
418 rec->set_next(NULL); | |
419 delete rec; | |
420 return; | |
421 } | |
422 | |
423 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
424 rec->set_next(cur_head); | |
425 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
426 (void*)cur_head)) { | |
427 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
428 rec->set_next(cur_head); | |
429 } | |
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430 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
6197 | 431 } |
432 | |
433 /* | |
434 * The method is called at global safepoint | |
435 * during it synchronization process. | |
436 * 1. enqueue all JavaThreads' per-thread recorders | |
437 * 2. enqueue global recorder | |
438 * 3. retrieve all pending recorders | |
439 * 4. reset global sequence number generator | |
440 * 5. call worker's sync | |
441 */ | |
442 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
443 #define SAFE_SEQUENCE_THRESHOLD 30 | |
444 #define HIGH_GENERATION_THRESHOLD 60 | |
445 | |
446 void MemTracker::sync() { | |
447 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
448 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
449 | |
450 // Some GC tests hit large number of safepoints in short period of time | |
451 // without meaningful activities. We should prevent going to | |
452 // sync point in these cases, which can potentially exhaust generation buffer. | |
453 // Here is the factots to determine if we should go into sync point: | |
454 // 1. not to overflow sequence number | |
455 // 2. if we are in danger to overflow generation buffer | |
456 // 3. how many safepoints we already skipped sync point | |
457 if (_state == NMT_started) { | |
458 // worker thread is not ready, no one can manage generation | |
459 // buffer, so skip this safepoint | |
460 if (_worker_thread == NULL) return; | |
461 | |
462 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
463 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
464 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
465 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
466 _sync_point_skip_count ++; | |
467 return; | |
468 } | |
469 } | |
470 _sync_point_skip_count = 0; | |
471 { | |
472 // This method is running at safepoint, with ThreadCritical lock, | |
473 // it should guarantee that NMT is fully sync-ed. | |
474 ThreadCritical tc; | |
6231 | 475 |
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476 SequenceGenerator::reset(); |
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477 |
6231 | 478 // walk all JavaThreads to collect recorders |
479 SyncThreadRecorderClosure stc; | |
480 Threads::threads_do(&stc); | |
481 | |
482 _thread_count = stc.get_thread_count(); | |
483 MemRecorder* pending_recorders = get_pending_recorders(); | |
484 | |
6197 | 485 if (_global_recorder != NULL) { |
486 _global_recorder->set_next(pending_recorders); | |
487 pending_recorders = _global_recorder; | |
488 _global_recorder = NULL; | |
489 } | |
490 // check _worker_thread with lock to avoid racing condition | |
491 if (_worker_thread != NULL) { | |
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492 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
6197 | 493 } |
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494 |
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495 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
6197 | 496 } |
497 } | |
498 | |
499 // now, it is the time to shut whole things off | |
500 if (_state == NMT_final_shutdown) { | |
501 // walk all JavaThreads to delete all recorders | |
502 SyncThreadRecorderClosure stc; | |
503 Threads::threads_do(&stc); | |
504 // delete global recorder | |
505 { | |
506 ThreadCritical tc; | |
507 if (_global_recorder != NULL) { | |
508 delete _global_recorder; | |
509 _global_recorder = NULL; | |
510 } | |
511 } | |
6231 | 512 MemRecorder* pending_recorders = get_pending_recorders(); |
513 if (pending_recorders != NULL) { | |
514 delete pending_recorders; | |
515 } | |
516 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
517 // completely shutdown NMT | |
518 if (MemRecorder::_instance_count == 0) { | |
519 _state = NMT_shutdown; | |
520 _tracking_level = NMT_off; | |
521 } | |
6197 | 522 } |
523 } | |
524 | |
525 /* | |
526 * Start worker thread. | |
527 */ | |
528 bool MemTracker::start_worker() { | |
529 assert(_worker_thread == NULL, "Just Check"); | |
530 _worker_thread = new (std::nothrow) MemTrackWorker(); | |
531 if (_worker_thread == NULL || _worker_thread->has_error()) { | |
532 shutdown(NMT_initialization); | |
533 return false; | |
534 } | |
535 _worker_thread->start(); | |
536 return true; | |
537 } | |
538 | |
539 /* | |
540 * We need to collect a JavaThread's per-thread recorder | |
541 * before it exits. | |
542 */ | |
543 void MemTracker::thread_exiting(JavaThread* thread) { | |
544 if (is_on()) { | |
545 MemRecorder* rec = thread->get_recorder(); | |
546 if (rec != NULL) { | |
547 enqueue_pending_recorder(rec); | |
548 thread->set_recorder(NULL); | |
549 } | |
550 } | |
551 } | |
552 | |
553 // baseline current memory snapshot | |
554 bool MemTracker::baseline() { | |
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555 MutexLockerEx lock(_query_lock, true); |
6197 | 556 MemSnapshot* snapshot = get_snapshot(); |
557 if (snapshot != NULL) { | |
558 return _baseline.baseline(*snapshot, false); | |
559 } | |
560 return false; | |
561 } | |
562 | |
563 // print memory usage from current snapshot | |
564 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
565 MemBaseline baseline; | |
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566 MutexLockerEx lock(_query_lock, true); |
6197 | 567 MemSnapshot* snapshot = get_snapshot(); |
568 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
569 BaselineReporter reporter(out, unit); | |
570 reporter.report_baseline(baseline, summary_only); | |
571 return true; | |
572 } | |
573 return false; | |
574 } | |
575 | |
7971
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576 // Whitebox API for blocking until the current generation of NMT data has been merged |
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577 bool MemTracker::wbtest_wait_for_data_merge() { |
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578 // NMT can't be shutdown while we're holding _query_lock |
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579 MutexLockerEx lock(_query_lock, true); |
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580 assert(_worker_thread != NULL, "Invalid query"); |
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581 // the generation at query time, so NMT will spin till this generation is processed |
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582 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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583 unsigned long current_processing_generation = _processing_generation; |
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584 // if generation counter overflown |
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585 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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586 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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587 // spin |
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588 while (!shutdown_in_progress()) { |
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589 if (!generation_overflown) { |
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590 if (current_processing_generation > generation_at_query_time) { |
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591 return true; |
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592 } |
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593 } else { |
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594 assert(generations_to_wrap >= 0, "Sanity check"); |
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595 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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596 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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597 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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598 if (current_generations_to_wrap > generations_to_wrap && |
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599 current_processing_generation > generation_at_query_time) { |
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600 return true; |
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601 } |
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602 } |
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603 |
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604 // if worker thread is idle, but generation is not advancing, that means |
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605 // there is not safepoint to let NMT advance generation, force one. |
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606 if (_worker_thread_idle) { |
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607 VM_ForceSafepoint vfs; |
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608 VMThread::execute(&vfs); |
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609 } |
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610 MemSnapshot* snapshot = get_snapshot(); |
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611 if (snapshot == NULL) { |
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612 return false; |
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613 } |
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614 snapshot->wait(1000); |
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615 current_processing_generation = _processing_generation; |
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616 } |
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617 // We end up here if NMT is shutting down before our data has been merged |
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618 return false; |
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619 } |
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620 |
6197 | 621 // compare memory usage between current snapshot and baseline |
622 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
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623 MutexLockerEx lock(_query_lock, true); |
6197 | 624 if (_baseline.baselined()) { |
625 MemBaseline baseline; | |
626 MemSnapshot* snapshot = get_snapshot(); | |
627 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
628 BaselineReporter reporter(out, unit); | |
629 reporter.diff_baselines(baseline, _baseline, summary_only); | |
630 return true; | |
631 } | |
632 } | |
633 return false; | |
634 } | |
635 | |
636 #ifndef PRODUCT | |
637 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
638 int cur_len = 0; | |
639 char tmp[1024]; | |
640 address pc; | |
641 | |
642 while (cur_len < len) { | |
643 pc = os::get_caller_pc(toSkip + 1); | |
644 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
645 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
646 cur_len = (int)strlen(buf); | |
647 } else { | |
648 buf[cur_len] = '\0'; | |
649 break; | |
650 } | |
651 toSkip ++; | |
652 } | |
653 } | |
654 | |
655 void MemTracker::print_tracker_stats(outputStream* st) { | |
656 st->print_cr("\nMemory Tracker Stats:"); | |
657 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
658 st->print_cr("\tthead count = %d", _thread_count); | |
659 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
660 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
661 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
662 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
663 if (_worker_thread != NULL) { | |
664 st->print_cr("\tWorker thread:"); | |
665 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
666 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
667 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
668 } else { | |
669 st->print_cr("\tWorker thread is not started"); | |
670 } | |
671 st->print_cr(" "); | |
672 | |
673 if (_snapshot != NULL) { | |
674 _snapshot->print_snapshot_stats(st); | |
675 } else { | |
676 st->print_cr("No snapshot"); | |
677 } | |
678 } | |
679 #endif | |
680 |