Mercurial > hg > graal-compiler
annotate src/share/vm/services/memTracker.cpp @ 7464:ecd24264898b
8005048: NMT: #loaded classes needs to just show the # defined classes
Summary: Count number of instance classes so that it matches class metadata size
Reviewed-by: coleenp, acorn
| author | zgu |
|---|---|
| date | Tue, 08 Jan 2013 14:04:25 -0500 |
| parents | bbc14465e7db |
| children | 4102b59539ce |
| 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" | |
| 32 #include "services/memPtr.hpp" | |
| 33 #include "services/memReporter.hpp" | |
| 34 #include "services/memTracker.hpp" | |
| 35 #include "utilities/decoder.hpp" | |
| 36 #include "utilities/globalDefinitions.hpp" | |
| 37 | |
| 38 bool NMT_track_callsite = false; | |
| 39 | |
| 40 // walk all 'known' threads at NMT sync point, and collect their recorders | |
| 41 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
| 42 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 43 if (thread->is_Java_thread()) { | |
| 44 JavaThread* javaThread = (JavaThread*)thread; | |
| 45 MemRecorder* recorder = javaThread->get_recorder(); | |
| 46 if (recorder != NULL) { | |
| 47 MemTracker::enqueue_pending_recorder(recorder); | |
| 48 javaThread->set_recorder(NULL); | |
| 49 } | |
| 50 } | |
| 51 _thread_count ++; | |
| 52 } | |
| 53 | |
| 54 | |
| 55 MemRecorder* MemTracker::_global_recorder = NULL; | |
| 56 MemSnapshot* MemTracker::_snapshot = NULL; | |
| 57 MemBaseline MemTracker::_baseline; | |
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58 Mutex* MemTracker::_query_lock = NULL; |
| 6197 | 59 volatile MemRecorder* MemTracker::_merge_pending_queue = NULL; |
| 60 volatile MemRecorder* MemTracker::_pooled_recorders = NULL; | |
| 61 MemTrackWorker* MemTracker::_worker_thread = NULL; | |
| 62 int MemTracker::_sync_point_skip_count = 0; | |
| 63 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
| 64 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
| 65 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
| 66 int MemTracker::_thread_count = 255; | |
| 67 volatile jint MemTracker::_pooled_recorder_count = 0; | |
| 68 debug_only(intx MemTracker::_main_thread_tid = 0;) | |
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69 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
| 6197 | 70 |
| 71 void MemTracker::init_tracking_options(const char* option_line) { | |
| 72 _tracking_level = NMT_off; | |
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73 if (strcmp(option_line, "=summary") == 0) { |
| 6197 | 74 _tracking_level = NMT_summary; |
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75 } else if (strcmp(option_line, "=detail") == 0) { |
| 6197 | 76 _tracking_level = NMT_detail; |
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77 } else if (strcmp(option_line, "=off") != 0) { |
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78 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
| 6197 | 79 } |
| 80 } | |
| 81 | |
| 82 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
| 83 void MemTracker::bootstrap_single_thread() { | |
| 84 if (_tracking_level > NMT_off) { | |
| 85 assert(_state == NMT_uninited, "wrong state"); | |
| 86 | |
| 87 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
| 88 // handle the amount of malloc data without significantly impacting | |
| 89 // runtime performance when this flag is on. | |
| 90 if (UseMallocOnly) { | |
| 91 shutdown(NMT_use_malloc_only); | |
| 92 return; | |
| 93 } | |
| 94 | |
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95 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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96 if (_query_lock == NULL) { |
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97 shutdown(NMT_out_of_memory); |
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98 return; |
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99 } |
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100 |
| 6197 | 101 debug_only(_main_thread_tid = os::current_thread_id();) |
| 102 _state = NMT_bootstrapping_single_thread; | |
| 103 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
| 108 void MemTracker::bootstrap_multi_thread() { | |
| 109 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
| 110 // create nmt lock for multi-thread execution | |
| 111 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 112 _state = NMT_bootstrapping_multi_thread; | |
| 113 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 // fully start nmt | |
| 118 void MemTracker::start() { | |
| 119 // Native memory tracking is off from command line option | |
| 120 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
| 121 | |
| 122 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 123 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
| 124 | |
| 125 _snapshot = new (std::nothrow)MemSnapshot(); | |
| 126 if (_snapshot != NULL && !_snapshot->out_of_memory()) { | |
| 127 if (start_worker()) { | |
| 128 _state = NMT_started; | |
| 129 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 130 return; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 // fail to start native memory tracking, shut it down | |
| 135 shutdown(NMT_initialization); | |
| 136 } | |
| 137 | |
| 138 /** | |
| 139 * Shutting down native memory tracking. | |
| 140 * We can not shutdown native memory tracking immediately, so we just | |
| 141 * setup shutdown pending flag, every native memory tracking component | |
| 142 * should orderly shut itself down. | |
| 143 * | |
| 144 * The shutdown sequences: | |
| 145 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 146 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 147 * MemTracker to final shutdown state. | |
| 148 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 149 * tracking level to off to complete shutdown. | |
| 150 */ | |
| 151 void MemTracker::shutdown(ShutdownReason reason) { | |
| 152 if (_tracking_level == NMT_off) return; | |
| 153 | |
| 154 if (_state <= NMT_bootstrapping_single_thread) { | |
| 155 // we still in single thread mode, there is not contention | |
| 156 _state = NMT_shutdown_pending; | |
| 157 _reason = reason; | |
| 158 } else { | |
| 159 // we want to know who initialized shutdown | |
| 160 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 161 (jint*)&_state, (jint)NMT_started)) { | |
| 162 _reason = reason; | |
| 163 } | |
| 164 } | |
| 165 } | |
| 166 | |
| 167 // final phase of shutdown | |
| 168 void MemTracker::final_shutdown() { | |
| 169 // delete all pending recorders and pooled recorders | |
| 170 delete_all_pending_recorders(); | |
| 171 delete_all_pooled_recorders(); | |
| 172 | |
| 173 { | |
| 174 // shared baseline and snapshot are the only objects needed to | |
| 175 // create query results | |
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176 MutexLockerEx locker(_query_lock, true); |
| 6197 | 177 // cleanup baseline data and snapshot |
| 178 _baseline.clear(); | |
| 179 delete _snapshot; | |
| 180 _snapshot = NULL; | |
| 181 } | |
| 182 | |
| 183 // shutdown shared decoder instance, since it is only | |
| 184 // used by native memory tracking so far. | |
| 185 Decoder::shutdown(); | |
| 186 | |
| 187 MemTrackWorker* worker = NULL; | |
| 188 { | |
| 189 ThreadCritical tc; | |
| 190 // can not delete worker inside the thread critical | |
| 191 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 192 worker = _worker_thread; | |
| 193 _worker_thread = NULL; | |
| 194 } | |
| 195 } | |
| 196 if (worker != NULL) { | |
| 197 delete worker; | |
| 198 } | |
| 199 _state = NMT_final_shutdown; | |
| 200 } | |
| 201 | |
| 202 // delete all pooled recorders | |
| 203 void MemTracker::delete_all_pooled_recorders() { | |
| 204 // free all pooled recorders | |
| 205 volatile MemRecorder* cur_head = _pooled_recorders; | |
| 206 if (cur_head != NULL) { | |
| 207 MemRecorder* null_ptr = NULL; | |
| 208 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 209 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 210 cur_head = _pooled_recorders; | |
| 211 } | |
| 212 if (cur_head != NULL) { | |
| 213 delete cur_head; | |
| 214 _pooled_recorder_count = 0; | |
| 215 } | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 // delete all recorders in pending queue | |
| 220 void MemTracker::delete_all_pending_recorders() { | |
| 221 // free all pending recorders | |
| 222 MemRecorder* pending_head = get_pending_recorders(); | |
| 223 if (pending_head != NULL) { | |
| 224 delete pending_head; | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 /* | |
| 229 * retrieve per-thread recorder of specified thread. | |
| 230 * if thread == NULL, it means global recorder | |
| 231 */ | |
| 232 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 233 if (shutdown_in_progress()) return NULL; | |
| 234 | |
| 235 MemRecorder* rc; | |
| 236 if (thread == NULL) { | |
| 237 rc = _global_recorder; | |
| 238 } else { | |
| 239 rc = thread->get_recorder(); | |
| 240 } | |
| 241 | |
| 242 if (rc != NULL && rc->is_full()) { | |
| 243 enqueue_pending_recorder(rc); | |
| 244 rc = NULL; | |
| 245 } | |
| 246 | |
| 247 if (rc == NULL) { | |
| 248 rc = get_new_or_pooled_instance(); | |
| 249 if (thread == NULL) { | |
| 250 _global_recorder = rc; | |
| 251 } else { | |
| 252 thread->set_recorder(rc); | |
| 253 } | |
| 254 } | |
| 255 return rc; | |
| 256 } | |
| 257 | |
| 258 /* | |
| 259 * get a per-thread recorder from pool, or create a new one if | |
| 260 * there is not one available. | |
| 261 */ | |
| 262 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 263 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 264 if (cur_head == NULL) { | |
| 265 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 266 if (rec == NULL || rec->out_of_memory()) { | |
| 267 shutdown(NMT_out_of_memory); | |
| 268 if (rec != NULL) { | |
| 269 delete rec; | |
| 270 rec = NULL; | |
| 271 } | |
| 272 } | |
| 273 return rec; | |
| 274 } else { | |
| 275 MemRecorder* next_head = cur_head->next(); | |
| 276 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 277 (void*)cur_head)) { | |
| 278 return get_new_or_pooled_instance(); | |
| 279 } | |
| 280 cur_head->set_next(NULL); | |
| 281 Atomic::dec(&_pooled_recorder_count); | |
| 282 debug_only(cur_head->set_generation();) | |
| 283 return cur_head; | |
| 284 } | |
| 285 } | |
| 286 | |
| 287 /* | |
| 288 * retrieve all recorders in pending queue, and empty the queue | |
| 289 */ | |
| 290 MemRecorder* MemTracker::get_pending_recorders() { | |
| 291 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 292 MemRecorder* null_ptr = NULL; | |
| 293 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 294 (void*)cur_head)) { | |
| 295 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 296 } | |
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297 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 298 return cur_head; |
| 299 } | |
| 300 | |
| 301 /* | |
| 302 * release a recorder to recorder pool. | |
| 303 */ | |
| 304 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 305 assert(rec != NULL, "null recorder"); | |
| 306 // we don't want to pool too many recorders | |
| 307 rec->set_next(NULL); | |
| 308 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 309 delete rec; | |
| 310 return; | |
| 311 } | |
| 312 | |
| 313 rec->clear(); | |
| 314 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 315 rec->set_next(cur_head); | |
| 316 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 317 (void*)cur_head)) { | |
| 318 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 319 rec->set_next(cur_head); | |
| 320 } | |
| 321 Atomic::inc(&_pooled_recorder_count); | |
| 322 } | |
| 323 | |
| 324 /* | |
| 325 * This is the most important method in whole nmt implementation. | |
| 326 * | |
| 327 * Create a memory record. | |
| 328 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
| 329 * still in single thread mode. | |
| 330 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
| 331 * to write to recorders to global recorder. | |
| 332 * 3. For JavaThreads that are not longer visible by safepoint, also | |
| 333 * need to take ThreadCritical and records are written to global | |
| 334 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
| 335 * 4. JavaThreads that are running in native state, have to transition | |
| 336 * to VM state before writing to per-thread recorders. | |
| 337 * 5. JavaThreads that are running in VM state do not need any lock and | |
| 338 * records are written to per-thread recorders. | |
| 339 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
| 340 * ThreadCritical to write to global recorder. | |
| 341 * | |
| 342 * Important note: | |
| 343 * NO LOCK should be taken inside ThreadCritical lock !!! | |
| 344 */ | |
| 345 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
| 346 size_t size, address pc, Thread* thread) { | |
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347 assert(addr != NULL, "Sanity check"); |
| 6197 | 348 if (!shutdown_in_progress()) { |
| 349 // single thread, we just write records direct to global recorder,' | |
| 350 // with any lock | |
| 351 if (_state == NMT_bootstrapping_single_thread) { | |
| 352 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 353 thread = NULL; | |
| 354 } else { | |
| 355 if (thread == NULL) { | |
| 356 // don't use Thread::current(), since it is possible that | |
| 357 // the calling thread has yet to attach to VM 'Thread', | |
| 358 // which will result assertion failure | |
| 359 thread = ThreadLocalStorage::thread(); | |
| 360 } | |
| 361 } | |
| 362 | |
| 363 if (thread != NULL) { | |
| 364 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { | |
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365 JavaThread* java_thread = (JavaThread*)thread; |
| 6231 | 366 JavaThreadState state = java_thread->thread_state(); |
| 367 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
| 368 // JavaThreads that are safepoint safe, can run through safepoint, | |
| 369 // so ThreadCritical is needed to ensure no threads at safepoint create | |
| 370 // new records while the records are being gathered and the sequence number is changing | |
| 371 ThreadCritical tc; | |
| 372 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
| 6197 | 373 } else { |
| 6231 | 374 create_record_in_recorder(addr, flags, size, pc, java_thread); |
| 6197 | 375 } |
| 376 } else { | |
| 377 // other threads, such as worker and watcher threads, etc. need to | |
| 378 // take ThreadCritical to write to global recorder | |
| 379 ThreadCritical tc; | |
| 380 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 381 } | |
| 382 } else { | |
| 383 if (_state == NMT_bootstrapping_single_thread) { | |
| 384 // single thread, no lock needed | |
| 385 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 386 } else { | |
| 387 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
| 388 // use native thread critical instead | |
| 389 ThreadCritical tc; | |
| 390 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 391 } | |
| 392 } | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 // write a record to proper recorder. No lock can be taken from this method | |
| 397 // down. | |
| 398 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
| 6231 | 399 size_t size, address pc, JavaThread* thread) { |
| 6197 | 400 |
| 6231 | 401 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 402 if (rc != NULL) { |
| 403 rc->record(addr, flags, size, pc); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 /** | |
| 408 * enqueue a recorder to pending queue | |
| 409 */ | |
| 410 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 411 assert(rec != NULL, "null recorder"); | |
| 412 | |
| 413 // we are shutting down, so just delete it | |
| 414 if (shutdown_in_progress()) { | |
| 415 rec->set_next(NULL); | |
| 416 delete rec; | |
| 417 return; | |
| 418 } | |
| 419 | |
| 420 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 421 rec->set_next(cur_head); | |
| 422 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 423 (void*)cur_head)) { | |
| 424 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 425 rec->set_next(cur_head); | |
| 426 } | |
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427 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 428 } |
| 429 | |
| 430 /* | |
| 431 * The method is called at global safepoint | |
| 432 * during it synchronization process. | |
| 433 * 1. enqueue all JavaThreads' per-thread recorders | |
| 434 * 2. enqueue global recorder | |
| 435 * 3. retrieve all pending recorders | |
| 436 * 4. reset global sequence number generator | |
| 437 * 5. call worker's sync | |
| 438 */ | |
| 439 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 440 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 441 #define HIGH_GENERATION_THRESHOLD 60 | |
| 442 | |
| 443 void MemTracker::sync() { | |
| 444 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 445 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 446 | |
| 447 // Some GC tests hit large number of safepoints in short period of time | |
| 448 // without meaningful activities. We should prevent going to | |
| 449 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 450 // Here is the factots to determine if we should go into sync point: | |
| 451 // 1. not to overflow sequence number | |
| 452 // 2. if we are in danger to overflow generation buffer | |
| 453 // 3. how many safepoints we already skipped sync point | |
| 454 if (_state == NMT_started) { | |
| 455 // worker thread is not ready, no one can manage generation | |
| 456 // buffer, so skip this safepoint | |
| 457 if (_worker_thread == NULL) return; | |
| 458 | |
| 459 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 460 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 461 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 462 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 463 _sync_point_skip_count ++; | |
| 464 return; | |
| 465 } | |
| 466 } | |
| 467 _sync_point_skip_count = 0; | |
| 468 { | |
| 469 // This method is running at safepoint, with ThreadCritical lock, | |
| 470 // it should guarantee that NMT is fully sync-ed. | |
| 471 ThreadCritical tc; | |
| 6231 | 472 |
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473 SequenceGenerator::reset(); |
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474 |
| 6231 | 475 // walk all JavaThreads to collect recorders |
| 476 SyncThreadRecorderClosure stc; | |
| 477 Threads::threads_do(&stc); | |
| 478 | |
| 479 _thread_count = stc.get_thread_count(); | |
| 480 MemRecorder* pending_recorders = get_pending_recorders(); | |
| 481 | |
| 6197 | 482 if (_global_recorder != NULL) { |
| 483 _global_recorder->set_next(pending_recorders); | |
| 484 pending_recorders = _global_recorder; | |
| 485 _global_recorder = NULL; | |
| 486 } | |
| 487 // check _worker_thread with lock to avoid racing condition | |
| 488 if (_worker_thread != NULL) { | |
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489 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
| 6197 | 490 } |
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491 |
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492 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
| 6197 | 493 } |
| 494 } | |
| 495 | |
| 496 // now, it is the time to shut whole things off | |
| 497 if (_state == NMT_final_shutdown) { | |
| 498 // walk all JavaThreads to delete all recorders | |
| 499 SyncThreadRecorderClosure stc; | |
| 500 Threads::threads_do(&stc); | |
| 501 // delete global recorder | |
| 502 { | |
| 503 ThreadCritical tc; | |
| 504 if (_global_recorder != NULL) { | |
| 505 delete _global_recorder; | |
| 506 _global_recorder = NULL; | |
| 507 } | |
| 508 } | |
| 6231 | 509 MemRecorder* pending_recorders = get_pending_recorders(); |
| 510 if (pending_recorders != NULL) { | |
| 511 delete pending_recorders; | |
| 512 } | |
| 513 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 514 // completely shutdown NMT | |
| 515 if (MemRecorder::_instance_count == 0) { | |
| 516 _state = NMT_shutdown; | |
| 517 _tracking_level = NMT_off; | |
| 518 } | |
| 6197 | 519 } |
| 520 } | |
| 521 | |
| 522 /* | |
| 523 * Start worker thread. | |
| 524 */ | |
| 525 bool MemTracker::start_worker() { | |
| 526 assert(_worker_thread == NULL, "Just Check"); | |
| 527 _worker_thread = new (std::nothrow) MemTrackWorker(); | |
| 528 if (_worker_thread == NULL || _worker_thread->has_error()) { | |
| 529 shutdown(NMT_initialization); | |
| 530 return false; | |
| 531 } | |
| 532 _worker_thread->start(); | |
| 533 return true; | |
| 534 } | |
| 535 | |
| 536 /* | |
| 537 * We need to collect a JavaThread's per-thread recorder | |
| 538 * before it exits. | |
| 539 */ | |
| 540 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 541 if (is_on()) { | |
| 542 MemRecorder* rec = thread->get_recorder(); | |
| 543 if (rec != NULL) { | |
| 544 enqueue_pending_recorder(rec); | |
| 545 thread->set_recorder(NULL); | |
| 546 } | |
| 547 } | |
| 548 } | |
| 549 | |
| 550 // baseline current memory snapshot | |
| 551 bool MemTracker::baseline() { | |
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552 MutexLockerEx lock(_query_lock, true); |
| 6197 | 553 MemSnapshot* snapshot = get_snapshot(); |
| 554 if (snapshot != NULL) { | |
| 555 return _baseline.baseline(*snapshot, false); | |
| 556 } | |
| 557 return false; | |
| 558 } | |
| 559 | |
| 560 // print memory usage from current snapshot | |
| 561 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 562 MemBaseline baseline; | |
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563 MutexLockerEx lock(_query_lock, true); |
| 6197 | 564 MemSnapshot* snapshot = get_snapshot(); |
| 565 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 566 BaselineReporter reporter(out, unit); | |
| 567 reporter.report_baseline(baseline, summary_only); | |
| 568 return true; | |
| 569 } | |
| 570 return false; | |
| 571 } | |
| 572 | |
| 573 // compare memory usage between current snapshot and baseline | |
| 574 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
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575 MutexLockerEx lock(_query_lock, true); |
| 6197 | 576 if (_baseline.baselined()) { |
| 577 MemBaseline baseline; | |
| 578 MemSnapshot* snapshot = get_snapshot(); | |
| 579 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 580 BaselineReporter reporter(out, unit); | |
| 581 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 582 return true; | |
| 583 } | |
| 584 } | |
| 585 return false; | |
| 586 } | |
| 587 | |
| 588 #ifndef PRODUCT | |
| 589 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 590 int cur_len = 0; | |
| 591 char tmp[1024]; | |
| 592 address pc; | |
| 593 | |
| 594 while (cur_len < len) { | |
| 595 pc = os::get_caller_pc(toSkip + 1); | |
| 596 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 597 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 598 cur_len = (int)strlen(buf); | |
| 599 } else { | |
| 600 buf[cur_len] = '\0'; | |
| 601 break; | |
| 602 } | |
| 603 toSkip ++; | |
| 604 } | |
| 605 } | |
| 606 | |
| 607 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 608 st->print_cr("\nMemory Tracker Stats:"); | |
| 609 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 610 st->print_cr("\tthead count = %d", _thread_count); | |
| 611 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 612 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 613 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 614 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 615 if (_worker_thread != NULL) { | |
| 616 st->print_cr("\tWorker thread:"); | |
| 617 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 618 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 619 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 620 } else { | |
| 621 st->print_cr("\tWorker thread is not started"); | |
| 622 } | |
| 623 st->print_cr(" "); | |
| 624 | |
| 625 if (_snapshot != NULL) { | |
| 626 _snapshot->print_snapshot_stats(st); | |
| 627 } else { | |
| 628 st->print_cr("No snapshot"); | |
| 629 } | |
| 630 } | |
| 631 #endif | |
| 632 |