Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 6882:716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
Summary: Enhanced virtual memory tracking to track committed regions as well as reserved regions, so NMT now can generate virtual memory map.
Reviewed-by: acorn, coleenp
| author | zgu |
|---|---|
| date | Fri, 19 Oct 2012 21:40:07 -0400 |
| parents | b711844284e2 |
| children | bbc14465e7db |
| 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 | |
| 26 #include "runtime/atomic.hpp" | |
| 27 #include "runtime/interfaceSupport.hpp" | |
| 28 #include "runtime/mutexLocker.hpp" | |
| 29 #include "runtime/safepoint.hpp" | |
| 30 #include "runtime/threadCritical.hpp" | |
| 31 #include "services/memPtr.hpp" | |
| 32 #include "services/memReporter.hpp" | |
| 33 #include "services/memTracker.hpp" | |
| 34 #include "utilities/decoder.hpp" | |
| 35 #include "utilities/globalDefinitions.hpp" | |
| 36 | |
| 37 bool NMT_track_callsite = false; | |
| 38 | |
| 39 // walk all 'known' threads at NMT sync point, and collect their recorders | |
| 40 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
| 41 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 42 if (thread->is_Java_thread()) { | |
| 43 JavaThread* javaThread = (JavaThread*)thread; | |
| 44 MemRecorder* recorder = javaThread->get_recorder(); | |
| 45 if (recorder != NULL) { | |
| 46 MemTracker::enqueue_pending_recorder(recorder); | |
| 47 javaThread->set_recorder(NULL); | |
| 48 } | |
| 49 } | |
| 50 _thread_count ++; | |
| 51 } | |
| 52 | |
| 53 | |
| 54 MemRecorder* MemTracker::_global_recorder = NULL; | |
| 55 MemSnapshot* MemTracker::_snapshot = NULL; | |
| 56 MemBaseline MemTracker::_baseline; | |
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57 Mutex* MemTracker::_query_lock = NULL; |
| 6197 | 58 volatile MemRecorder* MemTracker::_merge_pending_queue = NULL; |
| 59 volatile MemRecorder* MemTracker::_pooled_recorders = NULL; | |
| 60 MemTrackWorker* MemTracker::_worker_thread = NULL; | |
| 61 int MemTracker::_sync_point_skip_count = 0; | |
| 62 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
| 63 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
| 64 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
| 65 int MemTracker::_thread_count = 255; | |
| 66 volatile jint MemTracker::_pooled_recorder_count = 0; | |
| 67 debug_only(intx MemTracker::_main_thread_tid = 0;) | |
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68 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
| 6197 | 69 |
| 70 void MemTracker::init_tracking_options(const char* option_line) { | |
| 71 _tracking_level = NMT_off; | |
| 72 if (strncmp(option_line, "=summary", 8) == 0) { | |
| 73 _tracking_level = NMT_summary; | |
| 6781 | 74 } else if (strncmp(option_line, "=detail", 7) == 0) { |
| 6197 | 75 _tracking_level = NMT_detail; |
| 6781 | 76 } else { |
| 77 char msg[255]; | |
| 78 //+1 to remove the '=' character | |
| 79 jio_snprintf(msg, 255, "Unknown option given to XX:NativeMemoryTracking: %s", option_line+1); | |
| 80 vm_exit_during_initialization(msg, NULL); | |
| 6197 | 81 } |
| 82 } | |
| 83 | |
| 84 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
| 85 void MemTracker::bootstrap_single_thread() { | |
| 86 if (_tracking_level > NMT_off) { | |
| 87 assert(_state == NMT_uninited, "wrong state"); | |
| 88 | |
| 89 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
| 90 // handle the amount of malloc data without significantly impacting | |
| 91 // runtime performance when this flag is on. | |
| 92 if (UseMallocOnly) { | |
| 93 shutdown(NMT_use_malloc_only); | |
| 94 return; | |
| 95 } | |
| 96 | |
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97 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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98 if (_query_lock == NULL) { |
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99 shutdown(NMT_out_of_memory); |
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100 return; |
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101 } |
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102 |
| 6197 | 103 debug_only(_main_thread_tid = os::current_thread_id();) |
| 104 _state = NMT_bootstrapping_single_thread; | |
| 105 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 106 } | |
| 107 } | |
| 108 | |
| 109 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
| 110 void MemTracker::bootstrap_multi_thread() { | |
| 111 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
| 112 // create nmt lock for multi-thread execution | |
| 113 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 114 _state = NMT_bootstrapping_multi_thread; | |
| 115 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 // fully start nmt | |
| 120 void MemTracker::start() { | |
| 121 // Native memory tracking is off from command line option | |
| 122 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
| 123 | |
| 124 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 125 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
| 126 | |
| 127 _snapshot = new (std::nothrow)MemSnapshot(); | |
| 128 if (_snapshot != NULL && !_snapshot->out_of_memory()) { | |
| 129 if (start_worker()) { | |
| 130 _state = NMT_started; | |
| 131 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 132 return; | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 // fail to start native memory tracking, shut it down | |
| 137 shutdown(NMT_initialization); | |
| 138 } | |
| 139 | |
| 140 /** | |
| 141 * Shutting down native memory tracking. | |
| 142 * We can not shutdown native memory tracking immediately, so we just | |
| 143 * setup shutdown pending flag, every native memory tracking component | |
| 144 * should orderly shut itself down. | |
| 145 * | |
| 146 * The shutdown sequences: | |
| 147 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 148 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 149 * MemTracker to final shutdown state. | |
| 150 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 151 * tracking level to off to complete shutdown. | |
| 152 */ | |
| 153 void MemTracker::shutdown(ShutdownReason reason) { | |
| 154 if (_tracking_level == NMT_off) return; | |
| 155 | |
| 156 if (_state <= NMT_bootstrapping_single_thread) { | |
| 157 // we still in single thread mode, there is not contention | |
| 158 _state = NMT_shutdown_pending; | |
| 159 _reason = reason; | |
| 160 } else { | |
| 161 // we want to know who initialized shutdown | |
| 162 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 163 (jint*)&_state, (jint)NMT_started)) { | |
| 164 _reason = reason; | |
| 165 } | |
| 166 } | |
| 167 } | |
| 168 | |
| 169 // final phase of shutdown | |
| 170 void MemTracker::final_shutdown() { | |
| 171 // delete all pending recorders and pooled recorders | |
| 172 delete_all_pending_recorders(); | |
| 173 delete_all_pooled_recorders(); | |
| 174 | |
| 175 { | |
| 176 // shared baseline and snapshot are the only objects needed to | |
| 177 // create query results | |
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178 MutexLockerEx locker(_query_lock, true); |
| 6197 | 179 // cleanup baseline data and snapshot |
| 180 _baseline.clear(); | |
| 181 delete _snapshot; | |
| 182 _snapshot = NULL; | |
| 183 } | |
| 184 | |
| 185 // shutdown shared decoder instance, since it is only | |
| 186 // used by native memory tracking so far. | |
| 187 Decoder::shutdown(); | |
| 188 | |
| 189 MemTrackWorker* worker = NULL; | |
| 190 { | |
| 191 ThreadCritical tc; | |
| 192 // can not delete worker inside the thread critical | |
| 193 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 194 worker = _worker_thread; | |
| 195 _worker_thread = NULL; | |
| 196 } | |
| 197 } | |
| 198 if (worker != NULL) { | |
| 199 delete worker; | |
| 200 } | |
| 201 _state = NMT_final_shutdown; | |
| 202 } | |
| 203 | |
| 204 // delete all pooled recorders | |
| 205 void MemTracker::delete_all_pooled_recorders() { | |
| 206 // free all pooled recorders | |
| 207 volatile MemRecorder* cur_head = _pooled_recorders; | |
| 208 if (cur_head != NULL) { | |
| 209 MemRecorder* null_ptr = NULL; | |
| 210 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 211 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 212 cur_head = _pooled_recorders; | |
| 213 } | |
| 214 if (cur_head != NULL) { | |
| 215 delete cur_head; | |
| 216 _pooled_recorder_count = 0; | |
| 217 } | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 // delete all recorders in pending queue | |
| 222 void MemTracker::delete_all_pending_recorders() { | |
| 223 // free all pending recorders | |
| 224 MemRecorder* pending_head = get_pending_recorders(); | |
| 225 if (pending_head != NULL) { | |
| 226 delete pending_head; | |
| 227 } | |
| 228 } | |
| 229 | |
| 230 /* | |
| 231 * retrieve per-thread recorder of specified thread. | |
| 232 * if thread == NULL, it means global recorder | |
| 233 */ | |
| 234 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 235 if (shutdown_in_progress()) return NULL; | |
| 236 | |
| 237 MemRecorder* rc; | |
| 238 if (thread == NULL) { | |
| 239 rc = _global_recorder; | |
| 240 } else { | |
| 241 rc = thread->get_recorder(); | |
| 242 } | |
| 243 | |
| 244 if (rc != NULL && rc->is_full()) { | |
| 245 enqueue_pending_recorder(rc); | |
| 246 rc = NULL; | |
| 247 } | |
| 248 | |
| 249 if (rc == NULL) { | |
| 250 rc = get_new_or_pooled_instance(); | |
| 251 if (thread == NULL) { | |
| 252 _global_recorder = rc; | |
| 253 } else { | |
| 254 thread->set_recorder(rc); | |
| 255 } | |
| 256 } | |
| 257 return rc; | |
| 258 } | |
| 259 | |
| 260 /* | |
| 261 * get a per-thread recorder from pool, or create a new one if | |
| 262 * there is not one available. | |
| 263 */ | |
| 264 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 265 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 266 if (cur_head == NULL) { | |
| 267 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 268 if (rec == NULL || rec->out_of_memory()) { | |
| 269 shutdown(NMT_out_of_memory); | |
| 270 if (rec != NULL) { | |
| 271 delete rec; | |
| 272 rec = NULL; | |
| 273 } | |
| 274 } | |
| 275 return rec; | |
| 276 } else { | |
| 277 MemRecorder* next_head = cur_head->next(); | |
| 278 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 279 (void*)cur_head)) { | |
| 280 return get_new_or_pooled_instance(); | |
| 281 } | |
| 282 cur_head->set_next(NULL); | |
| 283 Atomic::dec(&_pooled_recorder_count); | |
| 284 debug_only(cur_head->set_generation();) | |
| 285 return cur_head; | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 /* | |
| 290 * retrieve all recorders in pending queue, and empty the queue | |
| 291 */ | |
| 292 MemRecorder* MemTracker::get_pending_recorders() { | |
| 293 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 294 MemRecorder* null_ptr = NULL; | |
| 295 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 296 (void*)cur_head)) { | |
| 297 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 298 } | |
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299 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 300 return cur_head; |
| 301 } | |
| 302 | |
| 303 /* | |
| 304 * release a recorder to recorder pool. | |
| 305 */ | |
| 306 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 307 assert(rec != NULL, "null recorder"); | |
| 308 // we don't want to pool too many recorders | |
| 309 rec->set_next(NULL); | |
| 310 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 311 delete rec; | |
| 312 return; | |
| 313 } | |
| 314 | |
| 315 rec->clear(); | |
| 316 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 317 rec->set_next(cur_head); | |
| 318 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 319 (void*)cur_head)) { | |
| 320 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 321 rec->set_next(cur_head); | |
| 322 } | |
| 323 Atomic::inc(&_pooled_recorder_count); | |
| 324 } | |
| 325 | |
| 326 /* | |
| 327 * This is the most important method in whole nmt implementation. | |
| 328 * | |
| 329 * Create a memory record. | |
| 330 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
| 331 * still in single thread mode. | |
| 332 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
| 333 * to write to recorders to global recorder. | |
| 334 * 3. For JavaThreads that are not longer visible by safepoint, also | |
| 335 * need to take ThreadCritical and records are written to global | |
| 336 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
| 337 * 4. JavaThreads that are running in native state, have to transition | |
| 338 * to VM state before writing to per-thread recorders. | |
| 339 * 5. JavaThreads that are running in VM state do not need any lock and | |
| 340 * records are written to per-thread recorders. | |
| 341 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
| 342 * ThreadCritical to write to global recorder. | |
| 343 * | |
| 344 * Important note: | |
| 345 * NO LOCK should be taken inside ThreadCritical lock !!! | |
| 346 */ | |
| 347 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
| 348 size_t size, address pc, Thread* thread) { | |
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349 assert(addr != NULL, "Sanity check"); |
| 6197 | 350 if (!shutdown_in_progress()) { |
| 351 // single thread, we just write records direct to global recorder,' | |
| 352 // with any lock | |
| 353 if (_state == NMT_bootstrapping_single_thread) { | |
| 354 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 355 thread = NULL; | |
| 356 } else { | |
| 357 if (thread == NULL) { | |
| 358 // don't use Thread::current(), since it is possible that | |
| 359 // the calling thread has yet to attach to VM 'Thread', | |
| 360 // which will result assertion failure | |
| 361 thread = ThreadLocalStorage::thread(); | |
| 362 } | |
| 363 } | |
| 364 | |
| 365 if (thread != NULL) { | |
| 366 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { | |
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367 JavaThread* java_thread = (JavaThread*)thread; |
| 6231 | 368 JavaThreadState state = java_thread->thread_state(); |
| 369 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
| 370 // JavaThreads that are safepoint safe, can run through safepoint, | |
| 371 // so ThreadCritical is needed to ensure no threads at safepoint create | |
| 372 // new records while the records are being gathered and the sequence number is changing | |
| 373 ThreadCritical tc; | |
| 374 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
| 6197 | 375 } else { |
| 6231 | 376 create_record_in_recorder(addr, flags, size, pc, java_thread); |
| 6197 | 377 } |
| 378 } else { | |
| 379 // other threads, such as worker and watcher threads, etc. need to | |
| 380 // take ThreadCritical to write to global recorder | |
| 381 ThreadCritical tc; | |
| 382 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 383 } | |
| 384 } else { | |
| 385 if (_state == NMT_bootstrapping_single_thread) { | |
| 386 // single thread, no lock needed | |
| 387 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 388 } else { | |
| 389 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
| 390 // use native thread critical instead | |
| 391 ThreadCritical tc; | |
| 392 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 393 } | |
| 394 } | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 // write a record to proper recorder. No lock can be taken from this method | |
| 399 // down. | |
| 400 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
| 6231 | 401 size_t size, address pc, JavaThread* thread) { |
| 6197 | 402 |
| 6231 | 403 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 404 if (rc != NULL) { |
| 405 rc->record(addr, flags, size, pc); | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 /** | |
| 410 * enqueue a recorder to pending queue | |
| 411 */ | |
| 412 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 413 assert(rec != NULL, "null recorder"); | |
| 414 | |
| 415 // we are shutting down, so just delete it | |
| 416 if (shutdown_in_progress()) { | |
| 417 rec->set_next(NULL); | |
| 418 delete rec; | |
| 419 return; | |
| 420 } | |
| 421 | |
| 422 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 423 rec->set_next(cur_head); | |
| 424 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 425 (void*)cur_head)) { | |
| 426 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 427 rec->set_next(cur_head); | |
| 428 } | |
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429 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 430 } |
| 431 | |
| 432 /* | |
| 433 * The method is called at global safepoint | |
| 434 * during it synchronization process. | |
| 435 * 1. enqueue all JavaThreads' per-thread recorders | |
| 436 * 2. enqueue global recorder | |
| 437 * 3. retrieve all pending recorders | |
| 438 * 4. reset global sequence number generator | |
| 439 * 5. call worker's sync | |
| 440 */ | |
| 441 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 442 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 443 #define HIGH_GENERATION_THRESHOLD 60 | |
| 444 | |
| 445 void MemTracker::sync() { | |
| 446 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 447 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 448 | |
| 449 // Some GC tests hit large number of safepoints in short period of time | |
| 450 // without meaningful activities. We should prevent going to | |
| 451 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 452 // Here is the factots to determine if we should go into sync point: | |
| 453 // 1. not to overflow sequence number | |
| 454 // 2. if we are in danger to overflow generation buffer | |
| 455 // 3. how many safepoints we already skipped sync point | |
| 456 if (_state == NMT_started) { | |
| 457 // worker thread is not ready, no one can manage generation | |
| 458 // buffer, so skip this safepoint | |
| 459 if (_worker_thread == NULL) return; | |
| 460 | |
| 461 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 462 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 463 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 464 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 465 _sync_point_skip_count ++; | |
| 466 return; | |
| 467 } | |
| 468 } | |
| 469 _sync_point_skip_count = 0; | |
| 470 { | |
| 471 // This method is running at safepoint, with ThreadCritical lock, | |
| 472 // it should guarantee that NMT is fully sync-ed. | |
| 473 ThreadCritical tc; | |
| 6231 | 474 |
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475 SequenceGenerator::reset(); |
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476 |
| 6231 | 477 // walk all JavaThreads to collect recorders |
| 478 SyncThreadRecorderClosure stc; | |
| 479 Threads::threads_do(&stc); | |
| 480 | |
| 481 _thread_count = stc.get_thread_count(); | |
| 482 MemRecorder* pending_recorders = get_pending_recorders(); | |
| 483 | |
| 6197 | 484 if (_global_recorder != NULL) { |
| 485 _global_recorder->set_next(pending_recorders); | |
| 486 pending_recorders = _global_recorder; | |
| 487 _global_recorder = NULL; | |
| 488 } | |
| 489 // check _worker_thread with lock to avoid racing condition | |
| 490 if (_worker_thread != NULL) { | |
| 491 _worker_thread->at_sync_point(pending_recorders); | |
| 492 } | |
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493 |
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494 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
| 6197 | 495 } |
| 496 } | |
| 497 | |
| 498 // now, it is the time to shut whole things off | |
| 499 if (_state == NMT_final_shutdown) { | |
| 500 // walk all JavaThreads to delete all recorders | |
| 501 SyncThreadRecorderClosure stc; | |
| 502 Threads::threads_do(&stc); | |
| 503 // delete global recorder | |
| 504 { | |
| 505 ThreadCritical tc; | |
| 506 if (_global_recorder != NULL) { | |
| 507 delete _global_recorder; | |
| 508 _global_recorder = NULL; | |
| 509 } | |
| 510 } | |
| 6231 | 511 MemRecorder* pending_recorders = get_pending_recorders(); |
| 512 if (pending_recorders != NULL) { | |
| 513 delete pending_recorders; | |
| 514 } | |
| 515 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 516 // completely shutdown NMT | |
| 517 if (MemRecorder::_instance_count == 0) { | |
| 518 _state = NMT_shutdown; | |
| 519 _tracking_level = NMT_off; | |
| 520 } | |
| 6197 | 521 } |
| 522 } | |
| 523 | |
| 524 /* | |
| 525 * Start worker thread. | |
| 526 */ | |
| 527 bool MemTracker::start_worker() { | |
| 528 assert(_worker_thread == NULL, "Just Check"); | |
| 529 _worker_thread = new (std::nothrow) MemTrackWorker(); | |
| 530 if (_worker_thread == NULL || _worker_thread->has_error()) { | |
| 531 shutdown(NMT_initialization); | |
| 532 return false; | |
| 533 } | |
| 534 _worker_thread->start(); | |
| 535 return true; | |
| 536 } | |
| 537 | |
| 538 /* | |
| 539 * We need to collect a JavaThread's per-thread recorder | |
| 540 * before it exits. | |
| 541 */ | |
| 542 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 543 if (is_on()) { | |
| 544 MemRecorder* rec = thread->get_recorder(); | |
| 545 if (rec != NULL) { | |
| 546 enqueue_pending_recorder(rec); | |
| 547 thread->set_recorder(NULL); | |
| 548 } | |
| 549 } | |
| 550 } | |
| 551 | |
| 552 // baseline current memory snapshot | |
| 553 bool MemTracker::baseline() { | |
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554 MutexLockerEx lock(_query_lock, true); |
| 6197 | 555 MemSnapshot* snapshot = get_snapshot(); |
| 556 if (snapshot != NULL) { | |
| 557 return _baseline.baseline(*snapshot, false); | |
| 558 } | |
| 559 return false; | |
| 560 } | |
| 561 | |
| 562 // print memory usage from current snapshot | |
| 563 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 564 MemBaseline baseline; | |
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565 MutexLockerEx lock(_query_lock, true); |
| 6197 | 566 MemSnapshot* snapshot = get_snapshot(); |
| 567 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 568 BaselineReporter reporter(out, unit); | |
| 569 reporter.report_baseline(baseline, summary_only); | |
| 570 return true; | |
| 571 } | |
| 572 return false; | |
| 573 } | |
| 574 | |
| 575 // compare memory usage between current snapshot and baseline | |
| 576 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
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577 MutexLockerEx lock(_query_lock, true); |
| 6197 | 578 if (_baseline.baselined()) { |
| 579 MemBaseline baseline; | |
| 580 MemSnapshot* snapshot = get_snapshot(); | |
| 581 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 582 BaselineReporter reporter(out, unit); | |
| 583 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 584 return true; | |
| 585 } | |
| 586 } | |
| 587 return false; | |
| 588 } | |
| 589 | |
| 590 #ifndef PRODUCT | |
| 591 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 592 int cur_len = 0; | |
| 593 char tmp[1024]; | |
| 594 address pc; | |
| 595 | |
| 596 while (cur_len < len) { | |
| 597 pc = os::get_caller_pc(toSkip + 1); | |
| 598 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 599 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 600 cur_len = (int)strlen(buf); | |
| 601 } else { | |
| 602 buf[cur_len] = '\0'; | |
| 603 break; | |
| 604 } | |
| 605 toSkip ++; | |
| 606 } | |
| 607 } | |
| 608 | |
| 609 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 610 st->print_cr("\nMemory Tracker Stats:"); | |
| 611 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 612 st->print_cr("\tthead count = %d", _thread_count); | |
| 613 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 614 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 615 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 616 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 617 if (_worker_thread != NULL) { | |
| 618 st->print_cr("\tWorker thread:"); | |
| 619 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 620 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 621 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 622 } else { | |
| 623 st->print_cr("\tWorker thread is not started"); | |
| 624 } | |
| 625 st->print_cr(" "); | |
| 626 | |
| 627 if (_snapshot != NULL) { | |
| 628 _snapshot->print_snapshot_stats(st); | |
| 629 } else { | |
| 630 st->print_cr("No snapshot"); | |
| 631 } | |
| 632 } | |
| 633 #endif | |
| 634 |