Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 8883:b9a918201d47
Merge with hsx25
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Sat, 06 Apr 2013 20:04:06 +0200 |
| parents | 06db4c0afbf3 |
| children | 4c8bb5e4f68f |
| rev | line source |
|---|---|
| 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; |
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71 volatile bool MemTracker::_slowdown_calling_thread = false; |
| 6197 | 72 debug_only(intx MemTracker::_main_thread_tid = 0;) |
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73 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
| 6197 | 74 |
| 75 void MemTracker::init_tracking_options(const char* option_line) { | |
| 76 _tracking_level = NMT_off; | |
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77 if (strcmp(option_line, "=summary") == 0) { |
| 6197 | 78 _tracking_level = NMT_summary; |
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79 } else if (strcmp(option_line, "=detail") == 0) { |
| 6197 | 80 _tracking_level = NMT_detail; |
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81 } else if (strcmp(option_line, "=off") != 0) { |
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82 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
| 6197 | 83 } |
| 84 } | |
| 85 | |
| 86 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
| 87 void MemTracker::bootstrap_single_thread() { | |
| 88 if (_tracking_level > NMT_off) { | |
| 89 assert(_state == NMT_uninited, "wrong state"); | |
| 90 | |
| 91 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
| 92 // handle the amount of malloc data without significantly impacting | |
| 93 // runtime performance when this flag is on. | |
| 94 if (UseMallocOnly) { | |
| 95 shutdown(NMT_use_malloc_only); | |
| 96 return; | |
| 97 } | |
| 98 | |
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99 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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100 if (_query_lock == NULL) { |
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101 shutdown(NMT_out_of_memory); |
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102 return; |
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103 } |
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104 |
| 6197 | 105 debug_only(_main_thread_tid = os::current_thread_id();) |
| 106 _state = NMT_bootstrapping_single_thread; | |
| 107 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
| 112 void MemTracker::bootstrap_multi_thread() { | |
| 113 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
| 114 // create nmt lock for multi-thread execution | |
| 115 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 116 _state = NMT_bootstrapping_multi_thread; | |
| 117 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 // fully start nmt | |
| 122 void MemTracker::start() { | |
| 123 // Native memory tracking is off from command line option | |
| 124 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
| 125 | |
| 126 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 127 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
| 128 | |
| 129 _snapshot = new (std::nothrow)MemSnapshot(); | |
| 130 if (_snapshot != NULL && !_snapshot->out_of_memory()) { | |
| 131 if (start_worker()) { | |
| 132 _state = NMT_started; | |
| 133 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 134 return; | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 // fail to start native memory tracking, shut it down | |
| 139 shutdown(NMT_initialization); | |
| 140 } | |
| 141 | |
| 142 /** | |
| 143 * Shutting down native memory tracking. | |
| 144 * We can not shutdown native memory tracking immediately, so we just | |
| 145 * setup shutdown pending flag, every native memory tracking component | |
| 146 * should orderly shut itself down. | |
| 147 * | |
| 148 * The shutdown sequences: | |
| 149 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 150 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 151 * MemTracker to final shutdown state. | |
| 152 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 153 * tracking level to off to complete shutdown. | |
| 154 */ | |
| 155 void MemTracker::shutdown(ShutdownReason reason) { | |
| 156 if (_tracking_level == NMT_off) return; | |
| 157 | |
| 158 if (_state <= NMT_bootstrapping_single_thread) { | |
| 159 // we still in single thread mode, there is not contention | |
| 160 _state = NMT_shutdown_pending; | |
| 161 _reason = reason; | |
| 162 } else { | |
| 163 // we want to know who initialized shutdown | |
| 164 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 165 (jint*)&_state, (jint)NMT_started)) { | |
| 166 _reason = reason; | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 // final phase of shutdown | |
| 172 void MemTracker::final_shutdown() { | |
| 173 // delete all pending recorders and pooled recorders | |
| 174 delete_all_pending_recorders(); | |
| 175 delete_all_pooled_recorders(); | |
| 176 | |
| 177 { | |
| 178 // shared baseline and snapshot are the only objects needed to | |
| 179 // create query results | |
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180 MutexLockerEx locker(_query_lock, true); |
| 6197 | 181 // cleanup baseline data and snapshot |
| 182 _baseline.clear(); | |
| 183 delete _snapshot; | |
| 184 _snapshot = NULL; | |
| 185 } | |
| 186 | |
| 187 // shutdown shared decoder instance, since it is only | |
| 188 // used by native memory tracking so far. | |
| 189 Decoder::shutdown(); | |
| 190 | |
| 191 MemTrackWorker* worker = NULL; | |
| 192 { | |
| 193 ThreadCritical tc; | |
| 194 // can not delete worker inside the thread critical | |
| 195 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 196 worker = _worker_thread; | |
| 197 _worker_thread = NULL; | |
| 198 } | |
| 199 } | |
| 200 if (worker != NULL) { | |
| 201 delete worker; | |
| 202 } | |
| 203 _state = NMT_final_shutdown; | |
| 204 } | |
| 205 | |
| 206 // delete all pooled recorders | |
| 207 void MemTracker::delete_all_pooled_recorders() { | |
| 208 // free all pooled recorders | |
| 209 volatile MemRecorder* cur_head = _pooled_recorders; | |
| 210 if (cur_head != NULL) { | |
| 211 MemRecorder* null_ptr = NULL; | |
| 212 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 213 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 214 cur_head = _pooled_recorders; | |
| 215 } | |
| 216 if (cur_head != NULL) { | |
| 217 delete cur_head; | |
| 218 _pooled_recorder_count = 0; | |
| 219 } | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 // delete all recorders in pending queue | |
| 224 void MemTracker::delete_all_pending_recorders() { | |
| 225 // free all pending recorders | |
| 226 MemRecorder* pending_head = get_pending_recorders(); | |
| 227 if (pending_head != NULL) { | |
| 228 delete pending_head; | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 /* | |
| 233 * retrieve per-thread recorder of specified thread. | |
| 234 * if thread == NULL, it means global recorder | |
| 235 */ | |
| 236 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 237 if (shutdown_in_progress()) return NULL; | |
| 238 | |
| 239 MemRecorder* rc; | |
| 240 if (thread == NULL) { | |
| 241 rc = _global_recorder; | |
| 242 } else { | |
| 243 rc = thread->get_recorder(); | |
| 244 } | |
| 245 | |
| 246 if (rc != NULL && rc->is_full()) { | |
| 247 enqueue_pending_recorder(rc); | |
| 248 rc = NULL; | |
| 249 } | |
| 250 | |
| 251 if (rc == NULL) { | |
| 252 rc = get_new_or_pooled_instance(); | |
| 253 if (thread == NULL) { | |
| 254 _global_recorder = rc; | |
| 255 } else { | |
| 256 thread->set_recorder(rc); | |
| 257 } | |
| 258 } | |
| 259 return rc; | |
| 260 } | |
| 261 | |
| 262 /* | |
| 263 * get a per-thread recorder from pool, or create a new one if | |
| 264 * there is not one available. | |
| 265 */ | |
| 266 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 267 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 268 if (cur_head == NULL) { | |
| 269 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 270 if (rec == NULL || rec->out_of_memory()) { | |
| 271 shutdown(NMT_out_of_memory); | |
| 272 if (rec != NULL) { | |
| 273 delete rec; | |
| 274 rec = NULL; | |
| 275 } | |
| 276 } | |
| 277 return rec; | |
| 278 } else { | |
| 279 MemRecorder* next_head = cur_head->next(); | |
| 280 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 281 (void*)cur_head)) { | |
| 282 return get_new_or_pooled_instance(); | |
| 283 } | |
| 284 cur_head->set_next(NULL); | |
| 285 Atomic::dec(&_pooled_recorder_count); | |
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286 cur_head->set_generation(); |
| 6197 | 287 return cur_head; |
| 288 } | |
| 289 } | |
| 290 | |
| 291 /* | |
| 292 * retrieve all recorders in pending queue, and empty the queue | |
| 293 */ | |
| 294 MemRecorder* MemTracker::get_pending_recorders() { | |
| 295 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 296 MemRecorder* null_ptr = NULL; | |
| 297 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 298 (void*)cur_head)) { | |
| 299 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 300 } | |
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301 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 302 return cur_head; |
| 303 } | |
| 304 | |
| 305 /* | |
| 306 * release a recorder to recorder pool. | |
| 307 */ | |
| 308 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 309 assert(rec != NULL, "null recorder"); | |
| 310 // we don't want to pool too many recorders | |
| 311 rec->set_next(NULL); | |
| 312 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 313 delete rec; | |
| 314 return; | |
| 315 } | |
| 316 | |
| 317 rec->clear(); | |
| 318 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 319 rec->set_next(cur_head); | |
| 320 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 321 (void*)cur_head)) { | |
| 322 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 323 rec->set_next(cur_head); | |
| 324 } | |
| 325 Atomic::inc(&_pooled_recorder_count); | |
| 326 } | |
| 327 | |
| 328 /* | |
| 329 * This is the most important method in whole nmt implementation. | |
| 330 * | |
| 331 * Create a memory record. | |
| 332 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
| 333 * still in single thread mode. | |
| 334 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
| 335 * to write to recorders to global recorder. | |
| 336 * 3. For JavaThreads that are not longer visible by safepoint, also | |
| 337 * need to take ThreadCritical and records are written to global | |
| 338 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
| 339 * 4. JavaThreads that are running in native state, have to transition | |
| 340 * to VM state before writing to per-thread recorders. | |
| 341 * 5. JavaThreads that are running in VM state do not need any lock and | |
| 342 * records are written to per-thread recorders. | |
| 343 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
| 344 * ThreadCritical to write to global recorder. | |
| 345 * | |
| 346 * Important note: | |
| 347 * NO LOCK should be taken inside ThreadCritical lock !!! | |
| 348 */ | |
| 349 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
| 350 size_t size, address pc, Thread* thread) { | |
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351 assert(addr != NULL, "Sanity check"); |
| 6197 | 352 if (!shutdown_in_progress()) { |
| 353 // single thread, we just write records direct to global recorder,' | |
| 354 // with any lock | |
| 355 if (_state == NMT_bootstrapping_single_thread) { | |
| 356 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 357 thread = NULL; | |
| 358 } else { | |
| 359 if (thread == NULL) { | |
| 360 // don't use Thread::current(), since it is possible that | |
| 361 // the calling thread has yet to attach to VM 'Thread', | |
| 362 // which will result assertion failure | |
| 363 thread = ThreadLocalStorage::thread(); | |
| 364 } | |
| 365 } | |
| 366 | |
| 367 if (thread != NULL) { | |
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368 // slow down all calling threads except NMT worker thread, so it |
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369 // can catch up. |
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370 if (_slowdown_calling_thread && thread != _worker_thread) { |
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371 os::yield_all(); |
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372 } |
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373 |
| 6197 | 374 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { |
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375 JavaThread* java_thread = (JavaThread*)thread; |
| 6231 | 376 JavaThreadState state = java_thread->thread_state(); |
| 377 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
| 378 // JavaThreads that are safepoint safe, can run through safepoint, | |
| 379 // so ThreadCritical is needed to ensure no threads at safepoint create | |
| 380 // new records while the records are being gathered and the sequence number is changing | |
| 381 ThreadCritical tc; | |
| 382 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
| 6197 | 383 } else { |
| 6231 | 384 create_record_in_recorder(addr, flags, size, pc, java_thread); |
| 6197 | 385 } |
| 386 } else { | |
| 387 // other threads, such as worker and watcher threads, etc. need to | |
| 388 // take ThreadCritical to write to global recorder | |
| 389 ThreadCritical tc; | |
| 390 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 391 } | |
| 392 } else { | |
| 393 if (_state == NMT_bootstrapping_single_thread) { | |
| 394 // single thread, no lock needed | |
| 395 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 396 } else { | |
| 397 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
| 398 // use native thread critical instead | |
| 399 ThreadCritical tc; | |
| 400 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 401 } | |
| 402 } | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 // write a record to proper recorder. No lock can be taken from this method | |
| 407 // down. | |
| 408 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
| 6231 | 409 size_t size, address pc, JavaThread* thread) { |
| 6197 | 410 |
| 6231 | 411 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 412 if (rc != NULL) { |
| 413 rc->record(addr, flags, size, pc); | |
| 414 } | |
| 415 } | |
| 416 | |
| 417 /** | |
| 418 * enqueue a recorder to pending queue | |
| 419 */ | |
| 420 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 421 assert(rec != NULL, "null recorder"); | |
| 422 | |
| 423 // we are shutting down, so just delete it | |
| 424 if (shutdown_in_progress()) { | |
| 425 rec->set_next(NULL); | |
| 426 delete rec; | |
| 427 return; | |
| 428 } | |
| 429 | |
| 430 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 431 rec->set_next(cur_head); | |
| 432 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 433 (void*)cur_head)) { | |
| 434 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 435 rec->set_next(cur_head); | |
| 436 } | |
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437 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 438 } |
| 439 | |
| 440 /* | |
| 441 * The method is called at global safepoint | |
| 442 * during it synchronization process. | |
| 443 * 1. enqueue all JavaThreads' per-thread recorders | |
| 444 * 2. enqueue global recorder | |
| 445 * 3. retrieve all pending recorders | |
| 446 * 4. reset global sequence number generator | |
| 447 * 5. call worker's sync | |
| 448 */ | |
| 449 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 450 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 451 #define HIGH_GENERATION_THRESHOLD 60 | |
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452 #define MAX_RECORDER_THREAD_RATIO 30 |
| 6197 | 453 |
| 454 void MemTracker::sync() { | |
| 455 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 456 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 457 | |
| 458 // Some GC tests hit large number of safepoints in short period of time | |
| 459 // without meaningful activities. We should prevent going to | |
| 460 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 461 // Here is the factots to determine if we should go into sync point: | |
| 462 // 1. not to overflow sequence number | |
| 463 // 2. if we are in danger to overflow generation buffer | |
| 464 // 3. how many safepoints we already skipped sync point | |
| 465 if (_state == NMT_started) { | |
| 466 // worker thread is not ready, no one can manage generation | |
| 467 // buffer, so skip this safepoint | |
| 468 if (_worker_thread == NULL) return; | |
| 469 | |
| 470 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 471 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 472 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 473 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 474 _sync_point_skip_count ++; | |
| 475 return; | |
| 476 } | |
| 477 } | |
| 478 _sync_point_skip_count = 0; | |
| 479 { | |
| 480 // This method is running at safepoint, with ThreadCritical lock, | |
| 481 // it should guarantee that NMT is fully sync-ed. | |
| 482 ThreadCritical tc; | |
| 6231 | 483 |
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484 SequenceGenerator::reset(); |
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485 |
| 6231 | 486 // walk all JavaThreads to collect recorders |
| 487 SyncThreadRecorderClosure stc; | |
| 488 Threads::threads_do(&stc); | |
| 489 | |
| 490 _thread_count = stc.get_thread_count(); | |
| 491 MemRecorder* pending_recorders = get_pending_recorders(); | |
| 492 | |
| 6197 | 493 if (_global_recorder != NULL) { |
| 494 _global_recorder->set_next(pending_recorders); | |
| 495 pending_recorders = _global_recorder; | |
| 496 _global_recorder = NULL; | |
| 497 } | |
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498 |
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499 // see if NMT has too many outstanding recorder instances, it usually |
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500 // means that worker thread is lagging behind in processing them. |
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501 if (!AutoShutdownNMT) { |
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502 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); |
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503 } |
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504 |
| 6197 | 505 // check _worker_thread with lock to avoid racing condition |
| 506 if (_worker_thread != NULL) { | |
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507 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
| 6197 | 508 } |
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509 |
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510 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
| 6197 | 511 } |
| 512 } | |
| 513 | |
| 514 // now, it is the time to shut whole things off | |
| 515 if (_state == NMT_final_shutdown) { | |
| 516 // walk all JavaThreads to delete all recorders | |
| 517 SyncThreadRecorderClosure stc; | |
| 518 Threads::threads_do(&stc); | |
| 519 // delete global recorder | |
| 520 { | |
| 521 ThreadCritical tc; | |
| 522 if (_global_recorder != NULL) { | |
| 523 delete _global_recorder; | |
| 524 _global_recorder = NULL; | |
| 525 } | |
| 526 } | |
| 6231 | 527 MemRecorder* pending_recorders = get_pending_recorders(); |
| 528 if (pending_recorders != NULL) { | |
| 529 delete pending_recorders; | |
| 530 } | |
| 531 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 532 // completely shutdown NMT | |
| 533 if (MemRecorder::_instance_count == 0) { | |
| 534 _state = NMT_shutdown; | |
| 535 _tracking_level = NMT_off; | |
| 536 } | |
| 6197 | 537 } |
| 538 } | |
| 539 | |
| 540 /* | |
| 541 * Start worker thread. | |
| 542 */ | |
| 543 bool MemTracker::start_worker() { | |
| 544 assert(_worker_thread == NULL, "Just Check"); | |
| 545 _worker_thread = new (std::nothrow) MemTrackWorker(); | |
| 546 if (_worker_thread == NULL || _worker_thread->has_error()) { | |
| 547 shutdown(NMT_initialization); | |
| 548 return false; | |
| 549 } | |
| 550 _worker_thread->start(); | |
| 551 return true; | |
| 552 } | |
| 553 | |
| 554 /* | |
| 555 * We need to collect a JavaThread's per-thread recorder | |
| 556 * before it exits. | |
| 557 */ | |
| 558 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 559 if (is_on()) { | |
| 560 MemRecorder* rec = thread->get_recorder(); | |
| 561 if (rec != NULL) { | |
| 562 enqueue_pending_recorder(rec); | |
| 563 thread->set_recorder(NULL); | |
| 564 } | |
| 565 } | |
| 566 } | |
| 567 | |
| 568 // baseline current memory snapshot | |
| 569 bool MemTracker::baseline() { | |
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570 MutexLockerEx lock(_query_lock, true); |
| 6197 | 571 MemSnapshot* snapshot = get_snapshot(); |
| 572 if (snapshot != NULL) { | |
| 573 return _baseline.baseline(*snapshot, false); | |
| 574 } | |
| 575 return false; | |
| 576 } | |
| 577 | |
| 578 // print memory usage from current snapshot | |
| 579 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 580 MemBaseline baseline; | |
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581 MutexLockerEx lock(_query_lock, true); |
| 6197 | 582 MemSnapshot* snapshot = get_snapshot(); |
| 583 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 584 BaselineReporter reporter(out, unit); | |
| 585 reporter.report_baseline(baseline, summary_only); | |
| 586 return true; | |
| 587 } | |
| 588 return false; | |
| 589 } | |
| 590 | |
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591 // Whitebox API for blocking until the current generation of NMT data has been merged |
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592 bool MemTracker::wbtest_wait_for_data_merge() { |
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593 // NMT can't be shutdown while we're holding _query_lock |
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594 MutexLockerEx lock(_query_lock, true); |
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595 assert(_worker_thread != NULL, "Invalid query"); |
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596 // the generation at query time, so NMT will spin till this generation is processed |
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597 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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598 unsigned long current_processing_generation = _processing_generation; |
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599 // if generation counter overflown |
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600 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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601 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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602 // spin |
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603 while (!shutdown_in_progress()) { |
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604 if (!generation_overflown) { |
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605 if (current_processing_generation > generation_at_query_time) { |
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606 return true; |
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607 } |
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608 } else { |
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609 assert(generations_to_wrap >= 0, "Sanity check"); |
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610 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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611 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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612 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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613 if (current_generations_to_wrap > generations_to_wrap && |
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614 current_processing_generation > generation_at_query_time) { |
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615 return true; |
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616 } |
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617 } |
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618 |
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619 // if worker thread is idle, but generation is not advancing, that means |
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620 // there is not safepoint to let NMT advance generation, force one. |
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621 if (_worker_thread_idle) { |
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622 VM_ForceSafepoint vfs; |
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623 VMThread::execute(&vfs); |
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624 } |
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625 MemSnapshot* snapshot = get_snapshot(); |
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626 if (snapshot == NULL) { |
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627 return false; |
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628 } |
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629 snapshot->wait(1000); |
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630 current_processing_generation = _processing_generation; |
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631 } |
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632 // We end up here if NMT is shutting down before our data has been merged |
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633 return false; |
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634 } |
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635 |
| 6197 | 636 // compare memory usage between current snapshot and baseline |
| 637 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
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638 MutexLockerEx lock(_query_lock, true); |
| 6197 | 639 if (_baseline.baselined()) { |
| 640 MemBaseline baseline; | |
| 641 MemSnapshot* snapshot = get_snapshot(); | |
| 642 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 643 BaselineReporter reporter(out, unit); | |
| 644 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 645 return true; | |
| 646 } | |
| 647 } | |
| 648 return false; | |
| 649 } | |
| 650 | |
| 651 #ifndef PRODUCT | |
| 652 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 653 int cur_len = 0; | |
| 654 char tmp[1024]; | |
| 655 address pc; | |
| 656 | |
| 657 while (cur_len < len) { | |
| 658 pc = os::get_caller_pc(toSkip + 1); | |
| 659 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 660 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 661 cur_len = (int)strlen(buf); | |
| 662 } else { | |
| 663 buf[cur_len] = '\0'; | |
| 664 break; | |
| 665 } | |
| 666 toSkip ++; | |
| 667 } | |
| 668 } | |
| 669 | |
| 670 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 671 st->print_cr("\nMemory Tracker Stats:"); | |
| 672 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 673 st->print_cr("\tthead count = %d", _thread_count); | |
| 674 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 675 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 676 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 677 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 678 if (_worker_thread != NULL) { | |
| 679 st->print_cr("\tWorker thread:"); | |
| 680 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 681 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 682 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 683 } else { | |
| 684 st->print_cr("\tWorker thread is not started"); | |
| 685 } | |
| 686 st->print_cr(" "); | |
| 687 | |
| 688 if (_snapshot != NULL) { | |
| 689 _snapshot->print_snapshot_stats(st); | |
| 690 } else { | |
| 691 st->print_cr("No snapshot"); | |
| 692 } | |
| 693 } | |
| 694 #endif | |
| 695 |