Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 10355:fb14e9ed1594
8011064: Some tests have failed with SIGSEGV on arm-hflt on build b82
Summary: NMT_detail is only supported when frame pointers are not omitted (-fno-omit-frame-pointer).
Reviewed-by: dholmes, cjplummer
| author | jprovino |
|---|---|
| date | Tue, 28 May 2013 11:32:46 -0400 |
| parents | fbca7eaeac2e |
| children | 1f4355cee9a2 16b10327b00d |
| 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" | |
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37 #include "utilities/defaultStream.hpp" |
| 6197 | 38 #include "utilities/globalDefinitions.hpp" |
| 39 | |
| 40 bool NMT_track_callsite = false; | |
| 41 | |
| 42 // walk all 'known' threads at NMT sync point, and collect their recorders | |
| 43 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
| 44 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 45 if (thread->is_Java_thread()) { | |
| 46 JavaThread* javaThread = (JavaThread*)thread; | |
| 47 MemRecorder* recorder = javaThread->get_recorder(); | |
| 48 if (recorder != NULL) { | |
| 49 MemTracker::enqueue_pending_recorder(recorder); | |
| 50 javaThread->set_recorder(NULL); | |
| 51 } | |
| 52 } | |
| 53 _thread_count ++; | |
| 54 } | |
| 55 | |
| 56 | |
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57 MemRecorder* volatile MemTracker::_global_recorder = NULL; |
| 6197 | 58 MemSnapshot* MemTracker::_snapshot = NULL; |
| 59 MemBaseline MemTracker::_baseline; | |
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60 Mutex* MemTracker::_query_lock = NULL; |
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61 MemRecorder* volatile MemTracker::_merge_pending_queue = NULL; |
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62 MemRecorder* volatile MemTracker::_pooled_recorders = NULL; |
| 6197 | 63 MemTrackWorker* MemTracker::_worker_thread = NULL; |
| 64 int MemTracker::_sync_point_skip_count = 0; | |
| 65 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
| 66 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
| 67 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
| 68 int MemTracker::_thread_count = 255; | |
| 69 volatile jint MemTracker::_pooled_recorder_count = 0; | |
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70 volatile unsigned long MemTracker::_processing_generation = 0; |
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71 volatile bool MemTracker::_worker_thread_idle = false; |
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72 volatile bool MemTracker::_slowdown_calling_thread = false; |
| 6197 | 73 debug_only(intx MemTracker::_main_thread_tid = 0;) |
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74 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
| 6197 | 75 |
| 76 void MemTracker::init_tracking_options(const char* option_line) { | |
| 77 _tracking_level = NMT_off; | |
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78 if (strcmp(option_line, "=summary") == 0) { |
| 6197 | 79 _tracking_level = NMT_summary; |
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80 } else if (strcmp(option_line, "=detail") == 0) { |
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81 // detail relies on a stack-walking ability that may not |
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82 // be available depending on platform and/or compiler flags |
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83 if (PLATFORM_NMT_DETAIL_SUPPORTED) { |
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84 _tracking_level = NMT_detail; |
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85 } else { |
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86 jio_fprintf(defaultStream::error_stream(), |
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87 "NMT detail is not supported on this platform. Using NMT summary instead."); |
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88 _tracking_level = NMT_summary; |
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89 } |
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90 } else if (strcmp(option_line, "=off") != 0) { |
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91 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
| 6197 | 92 } |
| 93 } | |
| 94 | |
| 95 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
| 96 void MemTracker::bootstrap_single_thread() { | |
| 97 if (_tracking_level > NMT_off) { | |
| 98 assert(_state == NMT_uninited, "wrong state"); | |
| 99 | |
| 100 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
| 101 // handle the amount of malloc data without significantly impacting | |
| 102 // runtime performance when this flag is on. | |
| 103 if (UseMallocOnly) { | |
| 104 shutdown(NMT_use_malloc_only); | |
| 105 return; | |
| 106 } | |
| 107 | |
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108 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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109 if (_query_lock == NULL) { |
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110 shutdown(NMT_out_of_memory); |
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111 return; |
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112 } |
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113 |
| 6197 | 114 debug_only(_main_thread_tid = os::current_thread_id();) |
| 115 _state = NMT_bootstrapping_single_thread; | |
| 116 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
| 121 void MemTracker::bootstrap_multi_thread() { | |
| 122 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
| 123 // create nmt lock for multi-thread execution | |
| 124 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 125 _state = NMT_bootstrapping_multi_thread; | |
| 126 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 // fully start nmt | |
| 131 void MemTracker::start() { | |
| 132 // Native memory tracking is off from command line option | |
| 133 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
| 134 | |
| 135 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 136 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
| 137 | |
| 138 _snapshot = new (std::nothrow)MemSnapshot(); | |
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139 if (_snapshot != NULL) { |
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140 if (!_snapshot->out_of_memory() && start_worker(_snapshot)) { |
| 6197 | 141 _state = NMT_started; |
| 142 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 143 return; | |
| 144 } | |
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145 |
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146 delete _snapshot; |
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147 _snapshot = NULL; |
| 6197 | 148 } |
| 149 | |
| 150 // fail to start native memory tracking, shut it down | |
| 151 shutdown(NMT_initialization); | |
| 152 } | |
| 153 | |
| 154 /** | |
| 155 * Shutting down native memory tracking. | |
| 156 * We can not shutdown native memory tracking immediately, so we just | |
| 157 * setup shutdown pending flag, every native memory tracking component | |
| 158 * should orderly shut itself down. | |
| 159 * | |
| 160 * The shutdown sequences: | |
| 161 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 162 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 163 * MemTracker to final shutdown state. | |
| 164 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 165 * tracking level to off to complete shutdown. | |
| 166 */ | |
| 167 void MemTracker::shutdown(ShutdownReason reason) { | |
| 168 if (_tracking_level == NMT_off) return; | |
| 169 | |
| 170 if (_state <= NMT_bootstrapping_single_thread) { | |
| 171 // we still in single thread mode, there is not contention | |
| 172 _state = NMT_shutdown_pending; | |
| 173 _reason = reason; | |
| 174 } else { | |
| 175 // we want to know who initialized shutdown | |
| 176 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 177 (jint*)&_state, (jint)NMT_started)) { | |
| 178 _reason = reason; | |
| 179 } | |
| 180 } | |
| 181 } | |
| 182 | |
| 183 // final phase of shutdown | |
| 184 void MemTracker::final_shutdown() { | |
| 185 // delete all pending recorders and pooled recorders | |
| 186 delete_all_pending_recorders(); | |
| 187 delete_all_pooled_recorders(); | |
| 188 | |
| 189 { | |
| 190 // shared baseline and snapshot are the only objects needed to | |
| 191 // create query results | |
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192 MutexLockerEx locker(_query_lock, true); |
| 6197 | 193 // cleanup baseline data and snapshot |
| 194 _baseline.clear(); | |
| 195 delete _snapshot; | |
| 196 _snapshot = NULL; | |
| 197 } | |
| 198 | |
| 199 // shutdown shared decoder instance, since it is only | |
| 200 // used by native memory tracking so far. | |
| 201 Decoder::shutdown(); | |
| 202 | |
| 203 MemTrackWorker* worker = NULL; | |
| 204 { | |
| 205 ThreadCritical tc; | |
| 206 // can not delete worker inside the thread critical | |
| 207 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 208 worker = _worker_thread; | |
| 209 _worker_thread = NULL; | |
| 210 } | |
| 211 } | |
| 212 if (worker != NULL) { | |
| 213 delete worker; | |
| 214 } | |
| 215 _state = NMT_final_shutdown; | |
| 216 } | |
| 217 | |
| 218 // delete all pooled recorders | |
| 219 void MemTracker::delete_all_pooled_recorders() { | |
| 220 // free all pooled recorders | |
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221 MemRecorder* volatile cur_head = _pooled_recorders; |
| 6197 | 222 if (cur_head != NULL) { |
| 223 MemRecorder* null_ptr = NULL; | |
| 224 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 225 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 226 cur_head = _pooled_recorders; | |
| 227 } | |
| 228 if (cur_head != NULL) { | |
| 229 delete cur_head; | |
| 230 _pooled_recorder_count = 0; | |
| 231 } | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 // delete all recorders in pending queue | |
| 236 void MemTracker::delete_all_pending_recorders() { | |
| 237 // free all pending recorders | |
| 238 MemRecorder* pending_head = get_pending_recorders(); | |
| 239 if (pending_head != NULL) { | |
| 240 delete pending_head; | |
| 241 } | |
| 242 } | |
| 243 | |
| 244 /* | |
| 245 * retrieve per-thread recorder of specified thread. | |
| 246 * if thread == NULL, it means global recorder | |
| 247 */ | |
| 248 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 249 if (shutdown_in_progress()) return NULL; | |
| 250 | |
| 251 MemRecorder* rc; | |
| 252 if (thread == NULL) { | |
| 253 rc = _global_recorder; | |
| 254 } else { | |
| 255 rc = thread->get_recorder(); | |
| 256 } | |
| 257 | |
| 258 if (rc != NULL && rc->is_full()) { | |
| 259 enqueue_pending_recorder(rc); | |
| 260 rc = NULL; | |
| 261 } | |
| 262 | |
| 263 if (rc == NULL) { | |
| 264 rc = get_new_or_pooled_instance(); | |
| 265 if (thread == NULL) { | |
| 266 _global_recorder = rc; | |
| 267 } else { | |
| 268 thread->set_recorder(rc); | |
| 269 } | |
| 270 } | |
| 271 return rc; | |
| 272 } | |
| 273 | |
| 274 /* | |
| 275 * get a per-thread recorder from pool, or create a new one if | |
| 276 * there is not one available. | |
| 277 */ | |
| 278 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 279 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 280 if (cur_head == NULL) { | |
| 281 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 282 if (rec == NULL || rec->out_of_memory()) { | |
| 283 shutdown(NMT_out_of_memory); | |
| 284 if (rec != NULL) { | |
| 285 delete rec; | |
| 286 rec = NULL; | |
| 287 } | |
| 288 } | |
| 289 return rec; | |
| 290 } else { | |
| 291 MemRecorder* next_head = cur_head->next(); | |
| 292 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 293 (void*)cur_head)) { | |
| 294 return get_new_or_pooled_instance(); | |
| 295 } | |
| 296 cur_head->set_next(NULL); | |
| 297 Atomic::dec(&_pooled_recorder_count); | |
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298 cur_head->set_generation(); |
| 6197 | 299 return cur_head; |
| 300 } | |
| 301 } | |
| 302 | |
| 303 /* | |
| 304 * retrieve all recorders in pending queue, and empty the queue | |
| 305 */ | |
| 306 MemRecorder* MemTracker::get_pending_recorders() { | |
| 307 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 308 MemRecorder* null_ptr = NULL; | |
| 309 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 310 (void*)cur_head)) { | |
| 311 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 312 } | |
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313 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 314 return cur_head; |
| 315 } | |
| 316 | |
| 317 /* | |
| 318 * release a recorder to recorder pool. | |
| 319 */ | |
| 320 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 321 assert(rec != NULL, "null recorder"); | |
| 322 // we don't want to pool too many recorders | |
| 323 rec->set_next(NULL); | |
| 324 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 325 delete rec; | |
| 326 return; | |
| 327 } | |
| 328 | |
| 329 rec->clear(); | |
| 330 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 331 rec->set_next(cur_head); | |
| 332 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 333 (void*)cur_head)) { | |
| 334 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 335 rec->set_next(cur_head); | |
| 336 } | |
| 337 Atomic::inc(&_pooled_recorder_count); | |
| 338 } | |
| 339 | |
| 340 /* | |
| 341 * This is the most important method in whole nmt implementation. | |
| 342 * | |
| 343 * Create a memory record. | |
| 344 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM | |
| 345 * still in single thread mode. | |
| 346 * 2. For all threads other than JavaThread, ThreadCritical is needed | |
| 347 * to write to recorders to global recorder. | |
| 348 * 3. For JavaThreads that are not longer visible by safepoint, also | |
| 349 * need to take ThreadCritical and records are written to global | |
| 350 * recorders, since these threads are NOT walked by Threads.do_thread(). | |
| 351 * 4. JavaThreads that are running in native state, have to transition | |
| 352 * to VM state before writing to per-thread recorders. | |
| 353 * 5. JavaThreads that are running in VM state do not need any lock and | |
| 354 * records are written to per-thread recorders. | |
| 355 * 6. For a thread has yet to attach VM 'Thread', they need to take | |
| 356 * ThreadCritical to write to global recorder. | |
| 357 * | |
| 358 * Important note: | |
| 359 * NO LOCK should be taken inside ThreadCritical lock !!! | |
| 360 */ | |
| 361 void MemTracker::create_memory_record(address addr, MEMFLAGS flags, | |
| 362 size_t size, address pc, Thread* thread) { | |
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363 assert(addr != NULL, "Sanity check"); |
| 6197 | 364 if (!shutdown_in_progress()) { |
| 365 // single thread, we just write records direct to global recorder,' | |
| 366 // with any lock | |
| 367 if (_state == NMT_bootstrapping_single_thread) { | |
| 368 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 369 thread = NULL; | |
| 370 } else { | |
| 371 if (thread == NULL) { | |
| 372 // don't use Thread::current(), since it is possible that | |
| 373 // the calling thread has yet to attach to VM 'Thread', | |
| 374 // which will result assertion failure | |
| 375 thread = ThreadLocalStorage::thread(); | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 if (thread != NULL) { | |
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380 // slow down all calling threads except NMT worker thread, so it |
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381 // can catch up. |
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382 if (_slowdown_calling_thread && thread != _worker_thread) { |
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383 os::yield_all(); |
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384 } |
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385 |
| 6197 | 386 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) { |
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387 JavaThread* java_thread = (JavaThread*)thread; |
| 6231 | 388 JavaThreadState state = java_thread->thread_state(); |
| 389 if (SafepointSynchronize::safepoint_safe(java_thread, state)) { | |
| 390 // JavaThreads that are safepoint safe, can run through safepoint, | |
| 391 // so ThreadCritical is needed to ensure no threads at safepoint create | |
| 392 // new records while the records are being gathered and the sequence number is changing | |
| 393 ThreadCritical tc; | |
| 394 create_record_in_recorder(addr, flags, size, pc, java_thread); | |
| 6197 | 395 } else { |
| 6231 | 396 create_record_in_recorder(addr, flags, size, pc, java_thread); |
| 6197 | 397 } |
| 398 } else { | |
| 399 // other threads, such as worker and watcher threads, etc. need to | |
| 400 // take ThreadCritical to write to global recorder | |
| 401 ThreadCritical tc; | |
| 402 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 403 } | |
| 404 } else { | |
| 405 if (_state == NMT_bootstrapping_single_thread) { | |
| 406 // single thread, no lock needed | |
| 407 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 408 } else { | |
| 409 // for thread has yet to attach VM 'Thread', we can not use VM mutex. | |
| 410 // use native thread critical instead | |
| 411 ThreadCritical tc; | |
| 412 create_record_in_recorder(addr, flags, size, pc, NULL); | |
| 413 } | |
| 414 } | |
| 415 } | |
| 416 } | |
| 417 | |
| 418 // write a record to proper recorder. No lock can be taken from this method | |
| 419 // down. | |
| 420 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags, | |
| 6231 | 421 size_t size, address pc, JavaThread* thread) { |
| 6197 | 422 |
| 6231 | 423 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 424 if (rc != NULL) { |
| 425 rc->record(addr, flags, size, pc); | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 /** | |
| 430 * enqueue a recorder to pending queue | |
| 431 */ | |
| 432 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 433 assert(rec != NULL, "null recorder"); | |
| 434 | |
| 435 // we are shutting down, so just delete it | |
| 436 if (shutdown_in_progress()) { | |
| 437 rec->set_next(NULL); | |
| 438 delete rec; | |
| 439 return; | |
| 440 } | |
| 441 | |
| 442 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 443 rec->set_next(cur_head); | |
| 444 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 445 (void*)cur_head)) { | |
| 446 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 447 rec->set_next(cur_head); | |
| 448 } | |
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449 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 450 } |
| 451 | |
| 452 /* | |
| 453 * The method is called at global safepoint | |
| 454 * during it synchronization process. | |
| 455 * 1. enqueue all JavaThreads' per-thread recorders | |
| 456 * 2. enqueue global recorder | |
| 457 * 3. retrieve all pending recorders | |
| 458 * 4. reset global sequence number generator | |
| 459 * 5. call worker's sync | |
| 460 */ | |
| 461 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 462 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 463 #define HIGH_GENERATION_THRESHOLD 60 | |
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464 #define MAX_RECORDER_THREAD_RATIO 30 |
| 6197 | 465 |
| 466 void MemTracker::sync() { | |
| 467 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 468 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 469 | |
| 470 // Some GC tests hit large number of safepoints in short period of time | |
| 471 // without meaningful activities. We should prevent going to | |
| 472 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 473 // Here is the factots to determine if we should go into sync point: | |
| 474 // 1. not to overflow sequence number | |
| 475 // 2. if we are in danger to overflow generation buffer | |
| 476 // 3. how many safepoints we already skipped sync point | |
| 477 if (_state == NMT_started) { | |
| 478 // worker thread is not ready, no one can manage generation | |
| 479 // buffer, so skip this safepoint | |
| 480 if (_worker_thread == NULL) return; | |
| 481 | |
| 482 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 483 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 484 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 485 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 486 _sync_point_skip_count ++; | |
| 487 return; | |
| 488 } | |
| 489 } | |
| 490 _sync_point_skip_count = 0; | |
| 491 { | |
| 492 // This method is running at safepoint, with ThreadCritical lock, | |
| 493 // it should guarantee that NMT is fully sync-ed. | |
| 494 ThreadCritical tc; | |
| 6231 | 495 |
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496 SequenceGenerator::reset(); |
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497 |
| 6231 | 498 // walk all JavaThreads to collect recorders |
| 499 SyncThreadRecorderClosure stc; | |
| 500 Threads::threads_do(&stc); | |
| 501 | |
| 502 _thread_count = stc.get_thread_count(); | |
| 503 MemRecorder* pending_recorders = get_pending_recorders(); | |
| 504 | |
| 6197 | 505 if (_global_recorder != NULL) { |
| 506 _global_recorder->set_next(pending_recorders); | |
| 507 pending_recorders = _global_recorder; | |
| 508 _global_recorder = NULL; | |
| 509 } | |
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510 |
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511 // see if NMT has too many outstanding recorder instances, it usually |
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512 // means that worker thread is lagging behind in processing them. |
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513 if (!AutoShutdownNMT) { |
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514 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); |
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515 } |
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516 |
| 6197 | 517 // check _worker_thread with lock to avoid racing condition |
| 518 if (_worker_thread != NULL) { | |
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519 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
| 6197 | 520 } |
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521 |
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522 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
| 6197 | 523 } |
| 524 } | |
| 525 | |
| 526 // now, it is the time to shut whole things off | |
| 527 if (_state == NMT_final_shutdown) { | |
| 528 // walk all JavaThreads to delete all recorders | |
| 529 SyncThreadRecorderClosure stc; | |
| 530 Threads::threads_do(&stc); | |
| 531 // delete global recorder | |
| 532 { | |
| 533 ThreadCritical tc; | |
| 534 if (_global_recorder != NULL) { | |
| 535 delete _global_recorder; | |
| 536 _global_recorder = NULL; | |
| 537 } | |
| 538 } | |
| 6231 | 539 MemRecorder* pending_recorders = get_pending_recorders(); |
| 540 if (pending_recorders != NULL) { | |
| 541 delete pending_recorders; | |
| 542 } | |
| 543 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 544 // completely shutdown NMT | |
| 545 if (MemRecorder::_instance_count == 0) { | |
| 546 _state = NMT_shutdown; | |
| 547 _tracking_level = NMT_off; | |
| 548 } | |
| 6197 | 549 } |
| 550 } | |
| 551 | |
| 552 /* | |
| 553 * Start worker thread. | |
| 554 */ | |
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555 bool MemTracker::start_worker(MemSnapshot* snapshot) { |
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556 assert(_worker_thread == NULL && _snapshot != NULL, "Just Check"); |
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557 _worker_thread = new (std::nothrow) MemTrackWorker(snapshot); |
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558 if (_worker_thread == NULL) { |
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559 return false; |
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560 } else if (_worker_thread->has_error()) { |
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561 delete _worker_thread; |
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562 _worker_thread = NULL; |
| 6197 | 563 return false; |
| 564 } | |
| 565 _worker_thread->start(); | |
| 566 return true; | |
| 567 } | |
| 568 | |
| 569 /* | |
| 570 * We need to collect a JavaThread's per-thread recorder | |
| 571 * before it exits. | |
| 572 */ | |
| 573 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 574 if (is_on()) { | |
| 575 MemRecorder* rec = thread->get_recorder(); | |
| 576 if (rec != NULL) { | |
| 577 enqueue_pending_recorder(rec); | |
| 578 thread->set_recorder(NULL); | |
| 579 } | |
| 580 } | |
| 581 } | |
| 582 | |
| 583 // baseline current memory snapshot | |
| 584 bool MemTracker::baseline() { | |
| 10148 | 585 MutexLocker lock(_query_lock); |
| 6197 | 586 MemSnapshot* snapshot = get_snapshot(); |
| 587 if (snapshot != NULL) { | |
| 588 return _baseline.baseline(*snapshot, false); | |
| 589 } | |
| 590 return false; | |
| 591 } | |
| 592 | |
| 593 // print memory usage from current snapshot | |
| 594 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 595 MemBaseline baseline; | |
| 10148 | 596 MutexLocker lock(_query_lock); |
| 6197 | 597 MemSnapshot* snapshot = get_snapshot(); |
| 598 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 599 BaselineReporter reporter(out, unit); | |
| 600 reporter.report_baseline(baseline, summary_only); | |
| 601 return true; | |
| 602 } | |
| 603 return false; | |
| 604 } | |
| 605 | |
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606 // Whitebox API for blocking until the current generation of NMT data has been merged |
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607 bool MemTracker::wbtest_wait_for_data_merge() { |
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608 // NMT can't be shutdown while we're holding _query_lock |
| 10148 | 609 MutexLocker lock(_query_lock); |
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610 assert(_worker_thread != NULL, "Invalid query"); |
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611 // the generation at query time, so NMT will spin till this generation is processed |
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612 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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613 unsigned long current_processing_generation = _processing_generation; |
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614 // if generation counter overflown |
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615 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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616 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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617 // spin |
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618 while (!shutdown_in_progress()) { |
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619 if (!generation_overflown) { |
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620 if (current_processing_generation > generation_at_query_time) { |
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621 return true; |
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622 } |
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623 } else { |
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624 assert(generations_to_wrap >= 0, "Sanity check"); |
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625 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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626 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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627 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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628 if (current_generations_to_wrap > generations_to_wrap && |
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629 current_processing_generation > generation_at_query_time) { |
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630 return true; |
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631 } |
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632 } |
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633 |
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634 // if worker thread is idle, but generation is not advancing, that means |
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635 // there is not safepoint to let NMT advance generation, force one. |
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636 if (_worker_thread_idle) { |
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637 VM_ForceSafepoint vfs; |
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638 VMThread::execute(&vfs); |
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639 } |
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640 MemSnapshot* snapshot = get_snapshot(); |
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641 if (snapshot == NULL) { |
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642 return false; |
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643 } |
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644 snapshot->wait(1000); |
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645 current_processing_generation = _processing_generation; |
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646 } |
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647 // We end up here if NMT is shutting down before our data has been merged |
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648 return false; |
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649 } |
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650 |
| 6197 | 651 // compare memory usage between current snapshot and baseline |
| 652 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 10148 | 653 MutexLocker lock(_query_lock); |
| 6197 | 654 if (_baseline.baselined()) { |
| 655 MemBaseline baseline; | |
| 656 MemSnapshot* snapshot = get_snapshot(); | |
| 657 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 658 BaselineReporter reporter(out, unit); | |
| 659 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 660 return true; | |
| 661 } | |
| 662 } | |
| 663 return false; | |
| 664 } | |
| 665 | |
| 666 #ifndef PRODUCT | |
| 667 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 668 int cur_len = 0; | |
| 669 char tmp[1024]; | |
| 670 address pc; | |
| 671 | |
| 672 while (cur_len < len) { | |
| 673 pc = os::get_caller_pc(toSkip + 1); | |
| 674 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 675 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 676 cur_len = (int)strlen(buf); | |
| 677 } else { | |
| 678 buf[cur_len] = '\0'; | |
| 679 break; | |
| 680 } | |
| 681 toSkip ++; | |
| 682 } | |
| 683 } | |
| 684 | |
| 685 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 686 st->print_cr("\nMemory Tracker Stats:"); | |
| 687 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 688 st->print_cr("\tthead count = %d", _thread_count); | |
| 689 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 690 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 691 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 692 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 693 if (_worker_thread != NULL) { | |
| 694 st->print_cr("\tWorker thread:"); | |
| 695 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 696 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 697 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 698 } else { | |
| 699 st->print_cr("\tWorker thread is not started"); | |
| 700 } | |
| 701 st->print_cr(" "); | |
| 702 | |
| 703 if (_snapshot != NULL) { | |
| 704 _snapshot->print_snapshot_stats(st); | |
| 705 } else { | |
| 706 st->print_cr("No snapshot"); | |
| 707 } | |
| 708 } | |
| 709 #endif | |
| 710 |