Mercurial > hg > graal-compiler
annotate src/share/vm/services/memTracker.cpp @ 9061:4c8bb5e4f68f
8011161: NMT: Memory leak when encountering out of memory error while initializing memory snapshot
Summary: Fix memory leaks when NMT fails to initialize snapshot and worker thread
Reviewed-by: dcubed, ccheung, rdurbin
| author | zgu |
|---|---|
| date | Fri, 05 Apr 2013 12:19:19 -0400 |
| parents | 06db4c0afbf3 |
| children | 35f8765422b9 |
| rev | line source |
|---|---|
| 6197 | 1 /* |
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| 6197 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 #include "precompiled.hpp" | |
| 25 | |
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26 #include "oops/instanceKlass.hpp" |
| 6197 | 27 #include "runtime/atomic.hpp" |
| 28 #include "runtime/interfaceSupport.hpp" | |
| 29 #include "runtime/mutexLocker.hpp" | |
| 30 #include "runtime/safepoint.hpp" | |
| 31 #include "runtime/threadCritical.hpp" | |
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32 #include "runtime/vm_operations.hpp" |
| 6197 | 33 #include "services/memPtr.hpp" |
| 34 #include "services/memReporter.hpp" | |
| 35 #include "services/memTracker.hpp" | |
| 36 #include "utilities/decoder.hpp" | |
| 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(); | |
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130 if (_snapshot != NULL) { |
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131 if (!_snapshot->out_of_memory() && start_worker()) { |
| 6197 | 132 _state = NMT_started; |
| 133 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 134 return; | |
| 135 } | |
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136 |
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137 delete _snapshot; |
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138 _snapshot = NULL; |
| 6197 | 139 } |
| 140 | |
| 141 // fail to start native memory tracking, shut it down | |
| 142 shutdown(NMT_initialization); | |
| 143 } | |
| 144 | |
| 145 /** | |
| 146 * Shutting down native memory tracking. | |
| 147 * We can not shutdown native memory tracking immediately, so we just | |
| 148 * setup shutdown pending flag, every native memory tracking component | |
| 149 * should orderly shut itself down. | |
| 150 * | |
| 151 * The shutdown sequences: | |
| 152 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 153 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 154 * MemTracker to final shutdown state. | |
| 155 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 156 * tracking level to off to complete shutdown. | |
| 157 */ | |
| 158 void MemTracker::shutdown(ShutdownReason reason) { | |
| 159 if (_tracking_level == NMT_off) return; | |
| 160 | |
| 161 if (_state <= NMT_bootstrapping_single_thread) { | |
| 162 // we still in single thread mode, there is not contention | |
| 163 _state = NMT_shutdown_pending; | |
| 164 _reason = reason; | |
| 165 } else { | |
| 166 // we want to know who initialized shutdown | |
| 167 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 168 (jint*)&_state, (jint)NMT_started)) { | |
| 169 _reason = reason; | |
| 170 } | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 // final phase of shutdown | |
| 175 void MemTracker::final_shutdown() { | |
| 176 // delete all pending recorders and pooled recorders | |
| 177 delete_all_pending_recorders(); | |
| 178 delete_all_pooled_recorders(); | |
| 179 | |
| 180 { | |
| 181 // shared baseline and snapshot are the only objects needed to | |
| 182 // create query results | |
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183 MutexLockerEx locker(_query_lock, true); |
| 6197 | 184 // cleanup baseline data and snapshot |
| 185 _baseline.clear(); | |
| 186 delete _snapshot; | |
| 187 _snapshot = NULL; | |
| 188 } | |
| 189 | |
| 190 // shutdown shared decoder instance, since it is only | |
| 191 // used by native memory tracking so far. | |
| 192 Decoder::shutdown(); | |
| 193 | |
| 194 MemTrackWorker* worker = NULL; | |
| 195 { | |
| 196 ThreadCritical tc; | |
| 197 // can not delete worker inside the thread critical | |
| 198 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 199 worker = _worker_thread; | |
| 200 _worker_thread = NULL; | |
| 201 } | |
| 202 } | |
| 203 if (worker != NULL) { | |
| 204 delete worker; | |
| 205 } | |
| 206 _state = NMT_final_shutdown; | |
| 207 } | |
| 208 | |
| 209 // delete all pooled recorders | |
| 210 void MemTracker::delete_all_pooled_recorders() { | |
| 211 // free all pooled recorders | |
| 212 volatile MemRecorder* cur_head = _pooled_recorders; | |
| 213 if (cur_head != NULL) { | |
| 214 MemRecorder* null_ptr = NULL; | |
| 215 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 216 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 217 cur_head = _pooled_recorders; | |
| 218 } | |
| 219 if (cur_head != NULL) { | |
| 220 delete cur_head; | |
| 221 _pooled_recorder_count = 0; | |
| 222 } | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 // delete all recorders in pending queue | |
| 227 void MemTracker::delete_all_pending_recorders() { | |
| 228 // free all pending recorders | |
| 229 MemRecorder* pending_head = get_pending_recorders(); | |
| 230 if (pending_head != NULL) { | |
| 231 delete pending_head; | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 /* | |
| 236 * retrieve per-thread recorder of specified thread. | |
| 237 * if thread == NULL, it means global recorder | |
| 238 */ | |
| 239 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 240 if (shutdown_in_progress()) return NULL; | |
| 241 | |
| 242 MemRecorder* rc; | |
| 243 if (thread == NULL) { | |
| 244 rc = _global_recorder; | |
| 245 } else { | |
| 246 rc = thread->get_recorder(); | |
| 247 } | |
| 248 | |
| 249 if (rc != NULL && rc->is_full()) { | |
| 250 enqueue_pending_recorder(rc); | |
| 251 rc = NULL; | |
| 252 } | |
| 253 | |
| 254 if (rc == NULL) { | |
| 255 rc = get_new_or_pooled_instance(); | |
| 256 if (thread == NULL) { | |
| 257 _global_recorder = rc; | |
| 258 } else { | |
| 259 thread->set_recorder(rc); | |
| 260 } | |
| 261 } | |
| 262 return rc; | |
| 263 } | |
| 264 | |
| 265 /* | |
| 266 * get a per-thread recorder from pool, or create a new one if | |
| 267 * there is not one available. | |
| 268 */ | |
| 269 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 270 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 271 if (cur_head == NULL) { | |
| 272 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 273 if (rec == NULL || rec->out_of_memory()) { | |
| 274 shutdown(NMT_out_of_memory); | |
| 275 if (rec != NULL) { | |
| 276 delete rec; | |
| 277 rec = NULL; | |
| 278 } | |
| 279 } | |
| 280 return rec; | |
| 281 } else { | |
| 282 MemRecorder* next_head = cur_head->next(); | |
| 283 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 284 (void*)cur_head)) { | |
| 285 return get_new_or_pooled_instance(); | |
| 286 } | |
| 287 cur_head->set_next(NULL); | |
| 288 Atomic::dec(&_pooled_recorder_count); | |
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289 cur_head->set_generation(); |
| 6197 | 290 return cur_head; |
| 291 } | |
| 292 } | |
| 293 | |
| 294 /* | |
| 295 * retrieve all recorders in pending queue, and empty the queue | |
| 296 */ | |
| 297 MemRecorder* MemTracker::get_pending_recorders() { | |
| 298 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 299 MemRecorder* null_ptr = NULL; | |
| 300 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 301 (void*)cur_head)) { | |
| 302 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 303 } | |
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304 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 305 return cur_head; |
| 306 } | |
| 307 | |
| 308 /* | |
| 309 * release a recorder to recorder pool. | |
| 310 */ | |
| 311 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 312 assert(rec != NULL, "null recorder"); | |
| 313 // we don't want to pool too many recorders | |
| 314 rec->set_next(NULL); | |
| 315 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 316 delete rec; | |
| 317 return; | |
| 318 } | |
| 319 | |
| 320 rec->clear(); | |
| 321 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 322 rec->set_next(cur_head); | |
| 323 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 324 (void*)cur_head)) { | |
| 325 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 326 rec->set_next(cur_head); | |
| 327 } | |
| 328 Atomic::inc(&_pooled_recorder_count); | |
| 329 } | |
| 330 | |
| 331 /* | |
| 332 * This is the most important method in whole nmt implementation. | |
| 333 * | |
| 334 * Create a memory record. | |
| 335 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
| 336 * still in single thread mode. | |
| 337 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
| 338 * to write to recorders to global recorder. | |
| 339 * 3. For JavaThreads that are not longer visible by safepoint, also | |
| 340 * need to take ThreadCritical and records are written to global | |
| 341 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
| 342 * 4. JavaThreads that are running in native state, have to transition | |
| 343 * to VM state before writing to per-thread recorders. | |
| 344 * 5. JavaThreads that are running in VM state do not need any lock and | |
| 345 * records are written to per-thread recorders. | |
| 346 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
| 347 * ThreadCritical to write to global recorder. | |
| 348 * | |
| 349 * Important note: | |
| 350 * NO LOCK should be taken inside ThreadCritical lock !!! | |
| 351 */ | |
| 352 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
| 353 size_t size, address pc, Thread* thread) { | |
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354 assert(addr != NULL, "Sanity check"); |
| 6197 | 355 if (!shutdown_in_progress()) { |
| 356 // single thread, we just write records direct to global recorder,' | |
| 357 // with any lock | |
| 358 if (_state == NMT_bootstrapping_single_thread) { | |
| 359 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 360 thread = NULL; | |
| 361 } else { | |
| 362 if (thread == NULL) { | |
| 363 // don't use Thread::current(), since it is possible that | |
| 364 // the calling thread has yet to attach to VM 'Thread', | |
| 365 // which will result assertion failure | |
| 366 thread = ThreadLocalStorage::thread(); | |
| 367 } | |
| 368 } | |
| 369 | |
| 370 if (thread != NULL) { | |
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371 // slow down all calling threads except NMT worker thread, so it |
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372 // can catch up. |
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373 if (_slowdown_calling_thread && thread != _worker_thread) { |
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374 os::yield_all(); |
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375 } |
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376 |
| 6197 | 377 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { |
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378 JavaThread* java_thread = (JavaThread*)thread; |
| 6231 | 379 JavaThreadState state = java_thread->thread_state(); |
| 380 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
| 381 // JavaThreads that are safepoint safe, can run through safepoint, | |
| 382 // so ThreadCritical is needed to ensure no threads at safepoint create | |
| 383 // new records while the records are being gathered and the sequence number is changing | |
| 384 ThreadCritical tc; | |
| 385 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
| 6197 | 386 } else { |
| 6231 | 387 create_record_in_recorder(addr, flags, size, pc, java_thread); |
| 6197 | 388 } |
| 389 } else { | |
| 390 // other threads, such as worker and watcher threads, etc. need to | |
| 391 // take ThreadCritical to write to global recorder | |
| 392 ThreadCritical tc; | |
| 393 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 394 } | |
| 395 } else { | |
| 396 if (_state == NMT_bootstrapping_single_thread) { | |
| 397 // single thread, no lock needed | |
| 398 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 399 } else { | |
| 400 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
| 401 // use native thread critical instead | |
| 402 ThreadCritical tc; | |
| 403 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 404 } | |
| 405 } | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 // write a record to proper recorder. No lock can be taken from this method | |
| 410 // down. | |
| 411 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
| 6231 | 412 size_t size, address pc, JavaThread* thread) { |
| 6197 | 413 |
| 6231 | 414 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 415 if (rc != NULL) { |
| 416 rc->record(addr, flags, size, pc); | |
| 417 } | |
| 418 } | |
| 419 | |
| 420 /** | |
| 421 * enqueue a recorder to pending queue | |
| 422 */ | |
| 423 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 424 assert(rec != NULL, "null recorder"); | |
| 425 | |
| 426 // we are shutting down, so just delete it | |
| 427 if (shutdown_in_progress()) { | |
| 428 rec->set_next(NULL); | |
| 429 delete rec; | |
| 430 return; | |
| 431 } | |
| 432 | |
| 433 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 434 rec->set_next(cur_head); | |
| 435 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 436 (void*)cur_head)) { | |
| 437 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 438 rec->set_next(cur_head); | |
| 439 } | |
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440 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 441 } |
| 442 | |
| 443 /* | |
| 444 * The method is called at global safepoint | |
| 445 * during it synchronization process. | |
| 446 * 1. enqueue all JavaThreads' per-thread recorders | |
| 447 * 2. enqueue global recorder | |
| 448 * 3. retrieve all pending recorders | |
| 449 * 4. reset global sequence number generator | |
| 450 * 5. call worker's sync | |
| 451 */ | |
| 452 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 453 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 454 #define HIGH_GENERATION_THRESHOLD 60 | |
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455 #define MAX_RECORDER_THREAD_RATIO 30 |
| 6197 | 456 |
| 457 void MemTracker::sync() { | |
| 458 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 459 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 460 | |
| 461 // Some GC tests hit large number of safepoints in short period of time | |
| 462 // without meaningful activities. We should prevent going to | |
| 463 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 464 // Here is the factots to determine if we should go into sync point: | |
| 465 // 1. not to overflow sequence number | |
| 466 // 2. if we are in danger to overflow generation buffer | |
| 467 // 3. how many safepoints we already skipped sync point | |
| 468 if (_state == NMT_started) { | |
| 469 // worker thread is not ready, no one can manage generation | |
| 470 // buffer, so skip this safepoint | |
| 471 if (_worker_thread == NULL) return; | |
| 472 | |
| 473 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 474 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 475 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 476 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 477 _sync_point_skip_count ++; | |
| 478 return; | |
| 479 } | |
| 480 } | |
| 481 _sync_point_skip_count = 0; | |
| 482 { | |
| 483 // This method is running at safepoint, with ThreadCritical lock, | |
| 484 // it should guarantee that NMT is fully sync-ed. | |
| 485 ThreadCritical tc; | |
| 6231 | 486 |
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487 SequenceGenerator::reset(); |
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488 |
| 6231 | 489 // walk all JavaThreads to collect recorders |
| 490 SyncThreadRecorderClosure stc; | |
| 491 Threads::threads_do(&stc); | |
| 492 | |
| 493 _thread_count = stc.get_thread_count(); | |
| 494 MemRecorder* pending_recorders = get_pending_recorders(); | |
| 495 | |
| 6197 | 496 if (_global_recorder != NULL) { |
| 497 _global_recorder->set_next(pending_recorders); | |
| 498 pending_recorders = _global_recorder; | |
| 499 _global_recorder = NULL; | |
| 500 } | |
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501 |
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502 // see if NMT has too many outstanding recorder instances, it usually |
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503 // means that worker thread is lagging behind in processing them. |
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504 if (!AutoShutdownNMT) { |
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505 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); |
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506 } |
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507 |
| 6197 | 508 // check _worker_thread with lock to avoid racing condition |
| 509 if (_worker_thread != NULL) { | |
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510 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
| 6197 | 511 } |
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512 |
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513 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
| 6197 | 514 } |
| 515 } | |
| 516 | |
| 517 // now, it is the time to shut whole things off | |
| 518 if (_state == NMT_final_shutdown) { | |
| 519 // walk all JavaThreads to delete all recorders | |
| 520 SyncThreadRecorderClosure stc; | |
| 521 Threads::threads_do(&stc); | |
| 522 // delete global recorder | |
| 523 { | |
| 524 ThreadCritical tc; | |
| 525 if (_global_recorder != NULL) { | |
| 526 delete _global_recorder; | |
| 527 _global_recorder = NULL; | |
| 528 } | |
| 529 } | |
| 6231 | 530 MemRecorder* pending_recorders = get_pending_recorders(); |
| 531 if (pending_recorders != NULL) { | |
| 532 delete pending_recorders; | |
| 533 } | |
| 534 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 535 // completely shutdown NMT | |
| 536 if (MemRecorder::_instance_count == 0) { | |
| 537 _state = NMT_shutdown; | |
| 538 _tracking_level = NMT_off; | |
| 539 } | |
| 6197 | 540 } |
| 541 } | |
| 542 | |
| 543 /* | |
| 544 * Start worker thread. | |
| 545 */ | |
| 546 bool MemTracker::start_worker() { | |
| 547 assert(_worker_thread == NULL, "Just Check"); | |
| 548 _worker_thread = new (std::nothrow) MemTrackWorker(); | |
| 549 if (_worker_thread == NULL || _worker_thread->has_error()) { | |
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550 if (_worker_thread != NULL) { |
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551 delete _worker_thread; |
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552 _worker_thread = NULL; |
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553 } |
| 6197 | 554 return false; |
| 555 } | |
| 556 _worker_thread->start(); | |
| 557 return true; | |
| 558 } | |
| 559 | |
| 560 /* | |
| 561 * We need to collect a JavaThread's per-thread recorder | |
| 562 * before it exits. | |
| 563 */ | |
| 564 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 565 if (is_on()) { | |
| 566 MemRecorder* rec = thread->get_recorder(); | |
| 567 if (rec != NULL) { | |
| 568 enqueue_pending_recorder(rec); | |
| 569 thread->set_recorder(NULL); | |
| 570 } | |
| 571 } | |
| 572 } | |
| 573 | |
| 574 // baseline current memory snapshot | |
| 575 bool MemTracker::baseline() { | |
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576 MutexLockerEx lock(_query_lock, true); |
| 6197 | 577 MemSnapshot* snapshot = get_snapshot(); |
| 578 if (snapshot != NULL) { | |
| 579 return _baseline.baseline(*snapshot, false); | |
| 580 } | |
| 581 return false; | |
| 582 } | |
| 583 | |
| 584 // print memory usage from current snapshot | |
| 585 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 586 MemBaseline baseline; | |
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587 MutexLockerEx lock(_query_lock, true); |
| 6197 | 588 MemSnapshot* snapshot = get_snapshot(); |
| 589 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 590 BaselineReporter reporter(out, unit); | |
| 591 reporter.report_baseline(baseline, summary_only); | |
| 592 return true; | |
| 593 } | |
| 594 return false; | |
| 595 } | |
| 596 | |
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597 // Whitebox API for blocking until the current generation of NMT data has been merged |
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598 bool MemTracker::wbtest_wait_for_data_merge() { |
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599 // NMT can't be shutdown while we're holding _query_lock |
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600 MutexLockerEx lock(_query_lock, true); |
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601 assert(_worker_thread != NULL, "Invalid query"); |
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602 // the generation at query time, so NMT will spin till this generation is processed |
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603 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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604 unsigned long current_processing_generation = _processing_generation; |
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605 // if generation counter overflown |
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606 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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607 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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608 // spin |
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609 while (!shutdown_in_progress()) { |
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610 if (!generation_overflown) { |
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611 if (current_processing_generation > generation_at_query_time) { |
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612 return true; |
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613 } |
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614 } else { |
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615 assert(generations_to_wrap >= 0, "Sanity check"); |
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616 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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617 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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618 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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619 if (current_generations_to_wrap > generations_to_wrap && |
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620 current_processing_generation > generation_at_query_time) { |
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621 return true; |
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622 } |
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623 } |
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624 |
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625 // if worker thread is idle, but generation is not advancing, that means |
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626 // there is not safepoint to let NMT advance generation, force one. |
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627 if (_worker_thread_idle) { |
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628 VM_ForceSafepoint vfs; |
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629 VMThread::execute(&vfs); |
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630 } |
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631 MemSnapshot* snapshot = get_snapshot(); |
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632 if (snapshot == NULL) { |
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633 return false; |
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634 } |
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635 snapshot->wait(1000); |
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636 current_processing_generation = _processing_generation; |
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637 } |
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638 // We end up here if NMT is shutting down before our data has been merged |
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639 return false; |
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640 } |
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641 |
| 6197 | 642 // compare memory usage between current snapshot and baseline |
| 643 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
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644 MutexLockerEx lock(_query_lock, true); |
| 6197 | 645 if (_baseline.baselined()) { |
| 646 MemBaseline baseline; | |
| 647 MemSnapshot* snapshot = get_snapshot(); | |
| 648 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 649 BaselineReporter reporter(out, unit); | |
| 650 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 651 return true; | |
| 652 } | |
| 653 } | |
| 654 return false; | |
| 655 } | |
| 656 | |
| 657 #ifndef PRODUCT | |
| 658 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 659 int cur_len = 0; | |
| 660 char tmp[1024]; | |
| 661 address pc; | |
| 662 | |
| 663 while (cur_len < len) { | |
| 664 pc = os::get_caller_pc(toSkip + 1); | |
| 665 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 666 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 667 cur_len = (int)strlen(buf); | |
| 668 } else { | |
| 669 buf[cur_len] = '\0'; | |
| 670 break; | |
| 671 } | |
| 672 toSkip ++; | |
| 673 } | |
| 674 } | |
| 675 | |
| 676 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 677 st->print_cr("\nMemory Tracker Stats:"); | |
| 678 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 679 st->print_cr("\tthead count = %d", _thread_count); | |
| 680 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 681 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 682 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 683 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 684 if (_worker_thread != NULL) { | |
| 685 st->print_cr("\tWorker thread:"); | |
| 686 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 687 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 688 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 689 } else { | |
| 690 st->print_cr("\tWorker thread is not started"); | |
| 691 } | |
| 692 st->print_cr(" "); | |
| 693 | |
| 694 if (_snapshot != NULL) { | |
| 695 _snapshot->print_snapshot_stats(st); | |
| 696 } else { | |
| 697 st->print_cr("No snapshot"); | |
| 698 } | |
| 699 } | |
| 700 #endif | |
| 701 |