Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
| author | goetz |
|---|---|
| date | Tue, 29 Apr 2014 15:17:27 +0200 |
| parents | 248c459b2b75 |
| children | 833b0f92429a |
| 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/thread.inline.hpp" |
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33 #include "runtime/vm_operations.hpp" |
| 6197 | 34 #include "services/memPtr.hpp" |
| 35 #include "services/memReporter.hpp" | |
| 36 #include "services/memTracker.hpp" | |
| 37 #include "utilities/decoder.hpp" | |
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38 #include "utilities/defaultStream.hpp" |
| 6197 | 39 #include "utilities/globalDefinitions.hpp" |
| 40 | |
| 41 bool NMT_track_callsite = false; | |
| 42 | |
| 43 // walk all 'known' threads at NMT sync point, and collect their recorders | |
| 44 void SyncThreadRecorderClosure::do_thread(Thread* thread) { | |
| 45 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 46 if (thread->is_Java_thread()) { | |
| 47 JavaThread* javaThread = (JavaThread*)thread; | |
| 48 MemRecorder* recorder = javaThread->get_recorder(); | |
| 49 if (recorder != NULL) { | |
| 50 MemTracker::enqueue_pending_recorder(recorder); | |
| 51 javaThread->set_recorder(NULL); | |
| 52 } | |
| 53 } | |
| 54 _thread_count ++; | |
| 55 } | |
| 56 | |
| 57 | |
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58 MemRecorder* volatile MemTracker::_global_recorder = NULL; |
| 6197 | 59 MemSnapshot* MemTracker::_snapshot = NULL; |
| 60 MemBaseline MemTracker::_baseline; | |
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61 Mutex* MemTracker::_query_lock = NULL; |
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62 MemRecorder* volatile MemTracker::_merge_pending_queue = NULL; |
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63 MemRecorder* volatile MemTracker::_pooled_recorders = NULL; |
| 6197 | 64 MemTrackWorker* MemTracker::_worker_thread = NULL; |
| 65 int MemTracker::_sync_point_skip_count = 0; | |
| 66 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off; | |
| 67 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited; | |
| 68 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none; | |
| 69 int MemTracker::_thread_count = 255; | |
| 70 volatile jint MemTracker::_pooled_recorder_count = 0; | |
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71 volatile unsigned long MemTracker::_processing_generation = 0; |
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72 volatile bool MemTracker::_worker_thread_idle = false; |
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73 volatile jint MemTracker::_pending_op_count = 0; |
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74 volatile bool MemTracker::_slowdown_calling_thread = false; |
| 6197 | 75 debug_only(intx MemTracker::_main_thread_tid = 0;) |
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76 NOT_PRODUCT(volatile jint MemTracker::_pending_recorder_count = 0;) |
| 6197 | 77 |
| 78 void MemTracker::init_tracking_options(const char* option_line) { | |
| 79 _tracking_level = NMT_off; | |
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80 if (strcmp(option_line, "=summary") == 0) { |
| 6197 | 81 _tracking_level = NMT_summary; |
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82 } else if (strcmp(option_line, "=detail") == 0) { |
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83 // detail relies on a stack-walking ability that may not |
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84 // be available depending on platform and/or compiler flags |
| 11129 | 85 #if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED |
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86 _tracking_level = NMT_detail; |
| 11129 | 87 #else |
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88 jio_fprintf(defaultStream::error_stream(), |
| 11129 | 89 "NMT detail is not supported on this platform. Using NMT summary instead.\n"); |
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90 _tracking_level = NMT_summary; |
| 11129 | 91 #endif |
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92 } else if (strcmp(option_line, "=off") != 0) { |
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93 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
| 6197 | 94 } |
| 95 } | |
| 96 | |
| 97 // first phase of bootstrapping, when VM is still in single-threaded mode. | |
| 98 void MemTracker::bootstrap_single_thread() { | |
| 99 if (_tracking_level > NMT_off) { | |
| 100 assert(_state == NMT_uninited, "wrong state"); | |
| 101 | |
| 102 // NMT is not supported with UseMallocOnly is on. NMT can NOT | |
| 103 // handle the amount of malloc data without significantly impacting | |
| 104 // runtime performance when this flag is on. | |
| 105 if (UseMallocOnly) { | |
| 106 shutdown(NMT_use_malloc_only); | |
| 107 return; | |
| 108 } | |
| 109 | |
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110 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
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111 if (_query_lock == NULL) { |
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112 shutdown(NMT_out_of_memory); |
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113 return; |
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114 } |
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115 |
| 6197 | 116 debug_only(_main_thread_tid = os::current_thread_id();) |
| 117 _state = NMT_bootstrapping_single_thread; | |
| 118 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode. | |
| 123 void MemTracker::bootstrap_multi_thread() { | |
| 124 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) { | |
| 125 // create nmt lock for multi-thread execution | |
| 126 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 127 _state = NMT_bootstrapping_multi_thread; | |
| 128 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 // fully start nmt | |
| 133 void MemTracker::start() { | |
| 134 // Native memory tracking is off from command line option | |
| 135 if (_tracking_level == NMT_off || shutdown_in_progress()) return; | |
| 136 | |
| 137 assert(_main_thread_tid == os::current_thread_id(), "wrong thread"); | |
| 138 assert(_state == NMT_bootstrapping_multi_thread, "wrong state"); | |
| 139 | |
| 140 _snapshot = new (std::nothrow)MemSnapshot(); | |
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141 if (_snapshot != NULL) { |
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142 if (!_snapshot->out_of_memory() && start_worker(_snapshot)) { |
| 6197 | 143 _state = NMT_started; |
| 144 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack()); | |
| 145 return; | |
| 146 } | |
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147 |
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148 delete _snapshot; |
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149 _snapshot = NULL; |
| 6197 | 150 } |
| 151 | |
| 152 // fail to start native memory tracking, shut it down | |
| 153 shutdown(NMT_initialization); | |
| 154 } | |
| 155 | |
| 156 /** | |
| 157 * Shutting down native memory tracking. | |
| 158 * We can not shutdown native memory tracking immediately, so we just | |
| 159 * setup shutdown pending flag, every native memory tracking component | |
| 160 * should orderly shut itself down. | |
| 161 * | |
| 162 * The shutdown sequences: | |
| 163 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state | |
| 164 * 2. Worker thread calls MemTracker::final_shutdown(), which transites | |
| 165 * MemTracker to final shutdown state. | |
| 166 * 3. At sync point, MemTracker does final cleanup, before sets memory | |
| 167 * tracking level to off to complete shutdown. | |
| 168 */ | |
| 169 void MemTracker::shutdown(ShutdownReason reason) { | |
| 170 if (_tracking_level == NMT_off) return; | |
| 171 | |
| 172 if (_state <= NMT_bootstrapping_single_thread) { | |
| 173 // we still in single thread mode, there is not contention | |
| 174 _state = NMT_shutdown_pending; | |
| 175 _reason = reason; | |
| 176 } else { | |
| 177 // we want to know who initialized shutdown | |
| 178 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending, | |
| 179 (jint*)&_state, (jint)NMT_started)) { | |
| 180 _reason = reason; | |
| 181 } | |
| 182 } | |
| 183 } | |
| 184 | |
| 185 // final phase of shutdown | |
| 186 void MemTracker::final_shutdown() { | |
| 187 // delete all pending recorders and pooled recorders | |
| 188 delete_all_pending_recorders(); | |
| 189 delete_all_pooled_recorders(); | |
| 190 | |
| 191 { | |
| 192 // shared baseline and snapshot are the only objects needed to | |
| 193 // create query results | |
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194 MutexLockerEx locker(_query_lock, true); |
| 6197 | 195 // cleanup baseline data and snapshot |
| 196 _baseline.clear(); | |
| 197 delete _snapshot; | |
| 198 _snapshot = NULL; | |
| 199 } | |
| 200 | |
| 201 // shutdown shared decoder instance, since it is only | |
| 202 // used by native memory tracking so far. | |
| 203 Decoder::shutdown(); | |
| 204 | |
| 205 MemTrackWorker* worker = NULL; | |
| 206 { | |
| 207 ThreadCritical tc; | |
| 208 // can not delete worker inside the thread critical | |
| 209 if (_worker_thread != NULL && Thread::current() == _worker_thread) { | |
| 210 worker = _worker_thread; | |
| 211 _worker_thread = NULL; | |
| 212 } | |
| 213 } | |
| 214 if (worker != NULL) { | |
| 215 delete worker; | |
| 216 } | |
| 217 _state = NMT_final_shutdown; | |
| 218 } | |
| 219 | |
| 220 // delete all pooled recorders | |
| 221 void MemTracker::delete_all_pooled_recorders() { | |
| 222 // free all pooled recorders | |
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223 MemRecorder* volatile cur_head = _pooled_recorders; |
| 6197 | 224 if (cur_head != NULL) { |
| 225 MemRecorder* null_ptr = NULL; | |
| 226 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, | |
| 227 (void*)&_pooled_recorders, (void*)cur_head)) { | |
| 228 cur_head = _pooled_recorders; | |
| 229 } | |
| 230 if (cur_head != NULL) { | |
| 231 delete cur_head; | |
| 232 _pooled_recorder_count = 0; | |
| 233 } | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 // delete all recorders in pending queue | |
| 238 void MemTracker::delete_all_pending_recorders() { | |
| 239 // free all pending recorders | |
| 240 MemRecorder* pending_head = get_pending_recorders(); | |
| 241 if (pending_head != NULL) { | |
| 242 delete pending_head; | |
| 243 } | |
| 244 } | |
| 245 | |
| 246 /* | |
| 247 * retrieve per-thread recorder of specified thread. | |
| 248 * if thread == NULL, it means global recorder | |
| 249 */ | |
| 250 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) { | |
| 251 if (shutdown_in_progress()) return NULL; | |
| 252 | |
| 253 MemRecorder* rc; | |
| 254 if (thread == NULL) { | |
| 255 rc = _global_recorder; | |
| 256 } else { | |
| 257 rc = thread->get_recorder(); | |
| 258 } | |
| 259 | |
| 260 if (rc != NULL && rc->is_full()) { | |
| 261 enqueue_pending_recorder(rc); | |
| 262 rc = NULL; | |
| 263 } | |
| 264 | |
| 265 if (rc == NULL) { | |
| 266 rc = get_new_or_pooled_instance(); | |
| 267 if (thread == NULL) { | |
| 268 _global_recorder = rc; | |
| 269 } else { | |
| 270 thread->set_recorder(rc); | |
| 271 } | |
| 272 } | |
| 273 return rc; | |
| 274 } | |
| 275 | |
| 276 /* | |
| 277 * get a per-thread recorder from pool, or create a new one if | |
| 278 * there is not one available. | |
| 279 */ | |
| 280 MemRecorder* MemTracker::get_new_or_pooled_instance() { | |
| 281 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders); | |
| 282 if (cur_head == NULL) { | |
| 283 MemRecorder* rec = new (std::nothrow)MemRecorder(); | |
| 284 if (rec == NULL || rec->out_of_memory()) { | |
| 285 shutdown(NMT_out_of_memory); | |
| 286 if (rec != NULL) { | |
| 287 delete rec; | |
| 288 rec = NULL; | |
| 289 } | |
| 290 } | |
| 291 return rec; | |
| 292 } else { | |
| 293 MemRecorder* next_head = cur_head->next(); | |
| 294 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders, | |
| 295 (void*)cur_head)) { | |
| 296 return get_new_or_pooled_instance(); | |
| 297 } | |
| 298 cur_head->set_next(NULL); | |
| 299 Atomic::dec(&_pooled_recorder_count); | |
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300 cur_head->set_generation(); |
| 6197 | 301 return cur_head; |
| 302 } | |
| 303 } | |
| 304 | |
| 305 /* | |
| 306 * retrieve all recorders in pending queue, and empty the queue | |
| 307 */ | |
| 308 MemRecorder* MemTracker::get_pending_recorders() { | |
| 309 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 310 MemRecorder* null_ptr = NULL; | |
| 311 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue, | |
| 312 (void*)cur_head)) { | |
| 313 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 314 } | |
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315 NOT_PRODUCT(Atomic::store(0, &_pending_recorder_count)); |
| 6197 | 316 return cur_head; |
| 317 } | |
| 318 | |
| 319 /* | |
| 320 * release a recorder to recorder pool. | |
| 321 */ | |
| 322 void MemTracker::release_thread_recorder(MemRecorder* rec) { | |
| 323 assert(rec != NULL, "null recorder"); | |
| 324 // we don't want to pool too many recorders | |
| 325 rec->set_next(NULL); | |
| 326 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) { | |
| 327 delete rec; | |
| 328 return; | |
| 329 } | |
| 330 | |
| 331 rec->clear(); | |
| 332 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 333 rec->set_next(cur_head); | |
| 334 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders, | |
| 335 (void*)cur_head)) { | |
| 336 cur_head = const_cast<MemRecorder*>(_pooled_recorders); | |
| 337 rec->set_next(cur_head); | |
| 338 } | |
| 339 Atomic::inc(&_pooled_recorder_count); | |
| 340 } | |
| 341 | |
| 342 // write a record to proper recorder. No lock can be taken from this method | |
| 343 // down. | |
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344 void MemTracker::write_tracking_record(address addr, MEMFLAGS flags, |
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345 size_t size, jint seq, address pc, JavaThread* thread) { |
| 6197 | 346 |
| 6231 | 347 MemRecorder* rc = get_thread_recorder(thread); |
| 6197 | 348 if (rc != NULL) { |
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349 rc->record(addr, flags, size, seq, pc); |
| 6197 | 350 } |
| 351 } | |
| 352 | |
| 353 /** | |
| 354 * enqueue a recorder to pending queue | |
| 355 */ | |
| 356 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) { | |
| 357 assert(rec != NULL, "null recorder"); | |
| 358 | |
| 359 // we are shutting down, so just delete it | |
| 360 if (shutdown_in_progress()) { | |
| 361 rec->set_next(NULL); | |
| 362 delete rec; | |
| 363 return; | |
| 364 } | |
| 365 | |
| 366 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 367 rec->set_next(cur_head); | |
| 368 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue, | |
| 369 (void*)cur_head)) { | |
| 370 cur_head = const_cast<MemRecorder*>(_merge_pending_queue); | |
| 371 rec->set_next(cur_head); | |
| 372 } | |
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373 NOT_PRODUCT(Atomic::inc(&_pending_recorder_count);) |
| 6197 | 374 } |
| 375 | |
| 376 /* | |
| 377 * The method is called at global safepoint | |
| 378 * during it synchronization process. | |
| 379 * 1. enqueue all JavaThreads' per-thread recorders | |
| 380 * 2. enqueue global recorder | |
| 381 * 3. retrieve all pending recorders | |
| 382 * 4. reset global sequence number generator | |
| 383 * 5. call worker's sync | |
| 384 */ | |
| 385 #define MAX_SAFEPOINTS_TO_SKIP 128 | |
| 386 #define SAFE_SEQUENCE_THRESHOLD 30 | |
| 387 #define HIGH_GENERATION_THRESHOLD 60 | |
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388 #define MAX_RECORDER_THREAD_RATIO 30 |
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389 #define MAX_RECORDER_PER_THREAD 100 |
| 6197 | 390 |
| 391 void MemTracker::sync() { | |
| 392 assert(_tracking_level > NMT_off, "NMT is not enabled"); | |
| 393 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); | |
| 394 | |
| 395 // Some GC tests hit large number of safepoints in short period of time | |
| 396 // without meaningful activities. We should prevent going to | |
| 397 // sync point in these cases, which can potentially exhaust generation buffer. | |
| 398 // Here is the factots to determine if we should go into sync point: | |
| 399 // 1. not to overflow sequence number | |
| 400 // 2. if we are in danger to overflow generation buffer | |
| 401 // 3. how many safepoints we already skipped sync point | |
| 402 if (_state == NMT_started) { | |
| 403 // worker thread is not ready, no one can manage generation | |
| 404 // buffer, so skip this safepoint | |
| 405 if (_worker_thread == NULL) return; | |
| 406 | |
| 407 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) { | |
| 408 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint; | |
| 409 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS; | |
| 410 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) { | |
| 411 _sync_point_skip_count ++; | |
| 412 return; | |
| 413 } | |
| 414 } | |
| 415 { | |
| 416 // This method is running at safepoint, with ThreadCritical lock, | |
| 417 // it should guarantee that NMT is fully sync-ed. | |
| 418 ThreadCritical tc; | |
| 6231 | 419 |
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420 // We can NOT execute NMT sync-point if there are pending tracking ops. |
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421 if (_pending_op_count == 0) { |
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422 SequenceGenerator::reset(); |
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423 _sync_point_skip_count = 0; |
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424 |
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425 // walk all JavaThreads to collect recorders |
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426 SyncThreadRecorderClosure stc; |
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427 Threads::threads_do(&stc); |
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428 |
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429 _thread_count = stc.get_thread_count(); |
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430 MemRecorder* pending_recorders = get_pending_recorders(); |
| 6231 | 431 |
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432 if (_global_recorder != NULL) { |
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433 _global_recorder->set_next(pending_recorders); |
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434 pending_recorders = _global_recorder; |
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435 _global_recorder = NULL; |
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436 } |
| 6231 | 437 |
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438 // see if NMT has too many outstanding recorder instances, it usually |
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439 // means that worker thread is lagging behind in processing them. |
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440 if (!AutoShutdownNMT) { |
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441 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); |
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442 } else { |
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443 // If auto shutdown is on, enforce MAX_RECORDER_PER_THREAD threshold to prevent OOM |
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444 if (MemRecorder::_instance_count >= _thread_count * MAX_RECORDER_PER_THREAD) { |
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445 shutdown(NMT_out_of_memory); |
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446 } |
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447 } |
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448 |
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449 // check _worker_thread with lock to avoid racing condition |
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450 if (_worker_thread != NULL) { |
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451 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); |
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452 } |
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453 assert(SequenceGenerator::peek() == 1, "Should not have memory activities during sync-point"); |
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454 } else { |
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455 _sync_point_skip_count ++; |
| 6197 | 456 } |
| 457 } | |
| 458 } | |
| 459 | |
| 460 // now, it is the time to shut whole things off | |
| 461 if (_state == NMT_final_shutdown) { | |
| 462 // walk all JavaThreads to delete all recorders | |
| 463 SyncThreadRecorderClosure stc; | |
| 464 Threads::threads_do(&stc); | |
| 465 // delete global recorder | |
| 466 { | |
| 467 ThreadCritical tc; | |
| 468 if (_global_recorder != NULL) { | |
| 469 delete _global_recorder; | |
| 470 _global_recorder = NULL; | |
| 471 } | |
| 472 } | |
| 6231 | 473 MemRecorder* pending_recorders = get_pending_recorders(); |
| 474 if (pending_recorders != NULL) { | |
| 475 delete pending_recorders; | |
| 476 } | |
| 477 // try at a later sync point to ensure MemRecorder instance drops to zero to | |
| 478 // completely shutdown NMT | |
| 479 if (MemRecorder::_instance_count == 0) { | |
| 480 _state = NMT_shutdown; | |
| 481 _tracking_level = NMT_off; | |
| 482 } | |
| 6197 | 483 } |
| 484 } | |
| 485 | |
| 486 /* | |
| 487 * Start worker thread. | |
| 488 */ | |
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489 bool MemTracker::start_worker(MemSnapshot* snapshot) { |
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490 assert(_worker_thread == NULL && _snapshot != NULL, "Just Check"); |
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491 _worker_thread = new (std::nothrow) MemTrackWorker(snapshot); |
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492 if (_worker_thread == NULL) { |
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493 return false; |
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494 } else if (_worker_thread->has_error()) { |
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495 delete _worker_thread; |
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496 _worker_thread = NULL; |
| 6197 | 497 return false; |
| 498 } | |
| 499 _worker_thread->start(); | |
| 500 return true; | |
| 501 } | |
| 502 | |
| 503 /* | |
| 504 * We need to collect a JavaThread's per-thread recorder | |
| 505 * before it exits. | |
| 506 */ | |
| 507 void MemTracker::thread_exiting(JavaThread* thread) { | |
| 508 if (is_on()) { | |
| 509 MemRecorder* rec = thread->get_recorder(); | |
| 510 if (rec != NULL) { | |
| 511 enqueue_pending_recorder(rec); | |
| 512 thread->set_recorder(NULL); | |
| 513 } | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 // baseline current memory snapshot | |
| 518 bool MemTracker::baseline() { | |
| 10148 | 519 MutexLocker lock(_query_lock); |
| 6197 | 520 MemSnapshot* snapshot = get_snapshot(); |
| 521 if (snapshot != NULL) { | |
| 522 return _baseline.baseline(*snapshot, false); | |
| 523 } | |
| 524 return false; | |
| 525 } | |
| 526 | |
| 527 // print memory usage from current snapshot | |
| 528 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 529 MemBaseline baseline; | |
| 10148 | 530 MutexLocker lock(_query_lock); |
| 6197 | 531 MemSnapshot* snapshot = get_snapshot(); |
| 532 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 533 BaselineReporter reporter(out, unit); | |
| 534 reporter.report_baseline(baseline, summary_only); | |
| 535 return true; | |
| 536 } | |
| 537 return false; | |
| 538 } | |
| 539 | |
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540 // Whitebox API for blocking until the current generation of NMT data has been merged |
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541 bool MemTracker::wbtest_wait_for_data_merge() { |
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542 // NMT can't be shutdown while we're holding _query_lock |
| 10148 | 543 MutexLocker lock(_query_lock); |
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544 assert(_worker_thread != NULL, "Invalid query"); |
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545 // the generation at query time, so NMT will spin till this generation is processed |
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546 unsigned long generation_at_query_time = SequenceGenerator::current_generation(); |
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547 unsigned long current_processing_generation = _processing_generation; |
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548 // if generation counter overflown |
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549 bool generation_overflown = (generation_at_query_time < current_processing_generation); |
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550 long generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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551 // spin |
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552 while (!shutdown_in_progress()) { |
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553 if (!generation_overflown) { |
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554 if (current_processing_generation > generation_at_query_time) { |
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555 return true; |
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556 } |
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557 } else { |
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558 assert(generations_to_wrap >= 0, "Sanity check"); |
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559 long current_generations_to_wrap = MAX_UNSIGNED_LONG - current_processing_generation; |
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560 assert(current_generations_to_wrap >= 0, "Sanity check"); |
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561 // to overflow an unsigned long should take long time, so to_wrap check should be sufficient |
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562 if (current_generations_to_wrap > generations_to_wrap && |
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563 current_processing_generation > generation_at_query_time) { |
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564 return true; |
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565 } |
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566 } |
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567 |
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568 // if worker thread is idle, but generation is not advancing, that means |
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569 // there is not safepoint to let NMT advance generation, force one. |
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570 if (_worker_thread_idle) { |
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571 VM_ForceSafepoint vfs; |
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572 VMThread::execute(&vfs); |
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573 } |
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574 MemSnapshot* snapshot = get_snapshot(); |
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575 if (snapshot == NULL) { |
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576 return false; |
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577 } |
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578 snapshot->wait(1000); |
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579 current_processing_generation = _processing_generation; |
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580 } |
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581 // We end up here if NMT is shutting down before our data has been merged |
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582 return false; |
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583 } |
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584 |
| 6197 | 585 // compare memory usage between current snapshot and baseline |
| 586 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) { | |
| 10148 | 587 MutexLocker lock(_query_lock); |
| 6197 | 588 if (_baseline.baselined()) { |
| 589 MemBaseline baseline; | |
| 590 MemSnapshot* snapshot = get_snapshot(); | |
| 591 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) { | |
| 592 BaselineReporter reporter(out, unit); | |
| 593 reporter.diff_baselines(baseline, _baseline, summary_only); | |
| 594 return true; | |
| 595 } | |
| 596 } | |
| 597 return false; | |
| 598 } | |
| 599 | |
| 600 #ifndef PRODUCT | |
| 601 void MemTracker::walk_stack(int toSkip, char* buf, int len) { | |
| 602 int cur_len = 0; | |
| 603 char tmp[1024]; | |
| 604 address pc; | |
| 605 | |
| 606 while (cur_len < len) { | |
| 607 pc = os::get_caller_pc(toSkip + 1); | |
| 608 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) { | |
| 609 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp); | |
| 610 cur_len = (int)strlen(buf); | |
| 611 } else { | |
| 612 buf[cur_len] = '\0'; | |
| 613 break; | |
| 614 } | |
| 615 toSkip ++; | |
| 616 } | |
| 617 } | |
| 618 | |
| 619 void MemTracker::print_tracker_stats(outputStream* st) { | |
| 620 st->print_cr("\nMemory Tracker Stats:"); | |
| 621 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num()); | |
| 622 st->print_cr("\tthead count = %d", _thread_count); | |
| 623 st->print_cr("\tArena instance = %d", Arena::_instance_count); | |
| 624 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count); | |
| 625 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count); | |
| 626 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count); | |
| 627 if (_worker_thread != NULL) { | |
| 628 st->print_cr("\tWorker thread:"); | |
| 629 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count); | |
| 630 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders()); | |
| 631 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count); | |
| 632 } else { | |
| 633 st->print_cr("\tWorker thread is not started"); | |
| 634 } | |
| 635 st->print_cr(" "); | |
| 636 | |
| 637 if (_snapshot != NULL) { | |
| 638 _snapshot->print_snapshot_stats(st); | |
| 639 } else { | |
| 640 st->print_cr("No snapshot"); | |
| 641 } | |
| 642 } | |
| 643 #endif | |
| 644 | |
|
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645 |
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646 // Tracker Implementation |
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647 |
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648 /* |
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649 * Create a tracker. |
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650 * This is a fairly complicated constructor, as it has to make two important decisions: |
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651 * 1) Does it need to take ThreadCritical lock to write tracking record |
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652 * 2) Does it need to pre-reserve a sequence number for the tracking record |
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653 * |
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654 * The rules to determine if ThreadCritical is needed: |
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655 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM |
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656 * still in single thread mode. |
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657 * 2. For all threads other than JavaThread, ThreadCritical is needed |
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658 * to write to recorders to global recorder. |
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659 * 3. For JavaThreads that are no longer visible by safepoint, also |
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660 * need to take ThreadCritical and records are written to global |
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661 * recorders, since these threads are NOT walked by Threads.do_thread(). |
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662 * 4. JavaThreads that are running in safepoint-safe states do not stop |
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663 * for safepoints, ThreadCritical lock should be taken to write |
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664 * memory records. |
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665 * 5. JavaThreads that are running in VM state do not need any lock and |
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666 * records are written to per-thread recorders. |
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667 * 6. For a thread has yet to attach VM 'Thread', they need to take |
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668 * ThreadCritical to write to global recorder. |
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669 * |
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670 * The memory operations that need pre-reserve sequence numbers: |
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671 * The memory operations that "release" memory blocks and the |
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672 * operations can fail, need to pre-reserve sequence number. They |
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673 * are realloc, uncommit and release. |
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674 * |
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675 * The reason for pre-reserve sequence number, is to prevent race condition: |
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676 * Thread 1 Thread 2 |
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677 * <release> |
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678 * <allocate> |
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679 * <write allocate record> |
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680 * <write release record> |
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681 * if Thread 2 happens to obtain the memory address Thread 1 just released, |
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682 * then NMT can mistakenly report the memory is free. |
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683 * |
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684 * Noticeably, free() does not need pre-reserve sequence number, because the call |
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685 * does not fail, so we can alway write "release" record before the memory is actaully |
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686 * freed. |
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687 * |
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688 * For realloc, uncommit and release, following coding pattern should be used: |
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689 * |
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690 * MemTracker::Tracker tkr = MemTracker::get_realloc_tracker(); |
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691 * ptr = ::realloc(...); |
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692 * if (ptr == NULL) { |
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693 * tkr.record(...) |
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694 * } else { |
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695 * tkr.discard(); |
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696 * } |
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697 * |
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698 * MemTracker::Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); |
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699 * if (uncommit(...)) { |
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700 * tkr.record(...); |
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701 * } else { |
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702 * tkr.discard(); |
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703 * } |
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704 * |
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705 * MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
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706 * if (release(...)) { |
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707 * tkr.record(...); |
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708 * } else { |
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709 * tkr.discard(); |
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710 * } |
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711 * |
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712 * Since pre-reserved sequence number is only good for the generation that it is acquired, |
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713 * when there is pending Tracker that reserved sequence number, NMT sync-point has |
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714 * to be skipped to prevent from advancing generation. This is done by inc and dec |
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715 * MemTracker::_pending_op_count, when MemTracker::_pending_op_count > 0, NMT sync-point is skipped. |
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716 * Not all pre-reservation of sequence number will increment pending op count. For JavaThreads |
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717 * that honor safepoints, safepoint can not occur during the memory operations, so the |
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718 * pre-reserved sequence number won't cross the generation boundry. |
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719 */ |
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720 MemTracker::Tracker::Tracker(MemoryOperation op, Thread* thr) { |
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721 _op = NoOp; |
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722 _seq = 0; |
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723 if (MemTracker::is_on()) { |
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724 _java_thread = NULL; |
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725 _op = op; |
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726 |
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727 // figure out if ThreadCritical lock is needed to write this operation |
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728 // to MemTracker |
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729 if (MemTracker::is_single_threaded_bootstrap()) { |
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730 thr = NULL; |
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731 } else if (thr == NULL) { |
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732 // don't use Thread::current(), since it is possible that |
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733 // the calling thread has yet to attach to VM 'Thread', |
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734 // which will result assertion failure |
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735 thr = ThreadLocalStorage::thread(); |
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736 } |
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737 |
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738 if (thr != NULL) { |
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739 // Check NMT load |
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740 MemTracker::check_NMT_load(thr); |
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741 |
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742 if (thr->is_Java_thread() && ((JavaThread*)thr)->is_safepoint_visible()) { |
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743 _java_thread = (JavaThread*)thr; |
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744 JavaThreadState state = _java_thread->thread_state(); |
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745 // JavaThreads that are safepoint safe, can run through safepoint, |
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746 // so ThreadCritical is needed to ensure no threads at safepoint create |
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747 // new records while the records are being gathered and the sequence number is changing |
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748 _need_thread_critical_lock = |
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749 SafepointSynchronize::safepoint_safe(_java_thread, state); |
|
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parents:
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diff
changeset
|
750 } else { |
|
1f4355cee9a2
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parents:
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diff
changeset
|
751 _need_thread_critical_lock = true; |
|
1f4355cee9a2
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parents:
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diff
changeset
|
752 } |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
753 } else { |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
754 _need_thread_critical_lock |
|
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diff
changeset
|
755 = !MemTracker::is_single_threaded_bootstrap(); |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
756 } |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
757 |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
758 // see if we need to pre-reserve sequence number for this operation |
|
1f4355cee9a2
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diff
changeset
|
759 if (_op == Realloc || _op == Uncommit || _op == Release) { |
|
1f4355cee9a2
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parents:
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diff
changeset
|
760 if (_need_thread_critical_lock) { |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
761 ThreadCritical tc; |
|
1f4355cee9a2
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parents:
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diff
changeset
|
762 MemTracker::inc_pending_op_count(); |
|
1f4355cee9a2
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diff
changeset
|
763 _seq = SequenceGenerator::next(); |
|
1f4355cee9a2
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parents:
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diff
changeset
|
764 } else { |
|
1f4355cee9a2
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diff
changeset
|
765 // for the threads that honor safepoints, no safepoint can occur |
|
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changeset
|
766 // during the lifespan of tracker, so we don't need to increase |
|
1f4355cee9a2
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parents:
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changeset
|
767 // pending op count. |
|
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changeset
|
768 _seq = SequenceGenerator::next(); |
|
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parents:
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diff
changeset
|
769 } |
|
1f4355cee9a2
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parents:
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diff
changeset
|
770 } |
|
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parents:
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diff
changeset
|
771 } |
|
1f4355cee9a2
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parents:
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diff
changeset
|
772 } |
|
1f4355cee9a2
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parents:
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diff
changeset
|
773 |
|
1f4355cee9a2
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parents:
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diff
changeset
|
774 void MemTracker::Tracker::discard() { |
|
1f4355cee9a2
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diff
changeset
|
775 if (MemTracker::is_on() && _seq != 0) { |
|
1f4355cee9a2
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zgu
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diff
changeset
|
776 if (_need_thread_critical_lock) { |
|
1f4355cee9a2
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diff
changeset
|
777 ThreadCritical tc; |
|
1f4355cee9a2
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parents:
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diff
changeset
|
778 MemTracker::dec_pending_op_count(); |
|
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parents:
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diff
changeset
|
779 } |
|
1f4355cee9a2
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parents:
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diff
changeset
|
780 _seq = 0; |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
781 } |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
782 } |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
783 |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
784 |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
785 void MemTracker::Tracker::record(address old_addr, address new_addr, size_t size, |
|
1f4355cee9a2
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parents:
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diff
changeset
|
786 MEMFLAGS flags, address pc) { |
|
1f4355cee9a2
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parents:
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diff
changeset
|
787 assert(old_addr != NULL && new_addr != NULL, "Sanity check"); |
|
1f4355cee9a2
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zgu
parents:
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diff
changeset
|
788 assert(_op == Realloc || _op == NoOp, "Wrong call"); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
789 if (MemTracker::is_on() && NMT_CAN_TRACK(flags) && _op != NoOp) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
790 assert(_seq > 0, "Need pre-reserve sequence number"); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
791 if (_need_thread_critical_lock) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
792 ThreadCritical tc; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
793 // free old address, use pre-reserved sequence number |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
794 MemTracker::write_tracking_record(old_addr, MemPointerRecord::free_tag(), |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
795 0, _seq, pc, _java_thread); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
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parents:
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diff
changeset
|
796 MemTracker::write_tracking_record(new_addr, flags | MemPointerRecord::malloc_tag(), |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
797 size, SequenceGenerator::next(), pc, _java_thread); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
798 // decrement MemTracker pending_op_count |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
799 MemTracker::dec_pending_op_count(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
800 } else { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
801 // free old address, use pre-reserved sequence number |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
802 MemTracker::write_tracking_record(old_addr, MemPointerRecord::free_tag(), |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
803 0, _seq, pc, _java_thread); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
804 MemTracker::write_tracking_record(new_addr, flags | MemPointerRecord::malloc_tag(), |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
805 size, SequenceGenerator::next(), pc, _java_thread); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
806 } |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
807 _seq = 0; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
808 } |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
809 } |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
810 |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
811 void MemTracker::Tracker::record(address addr, size_t size, MEMFLAGS flags, address pc) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
812 // OOM already? |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
813 if (addr == NULL) return; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
814 |
|
1f4355cee9a2
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zgu
parents:
10355
diff
changeset
|
815 if (MemTracker::is_on() && NMT_CAN_TRACK(flags) && _op != NoOp) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
816 bool pre_reserved_seq = (_seq != 0); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
817 address pc = CALLER_CALLER_PC; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
818 MEMFLAGS orig_flags = flags; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
819 |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
820 // or the tagging flags |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
821 switch(_op) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
822 case Malloc: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
823 flags |= MemPointerRecord::malloc_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
824 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
825 case Free: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
826 flags = MemPointerRecord::free_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
827 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
828 case Realloc: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
829 fatal("Use the other Tracker::record()"); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
830 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
831 case Reserve: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
832 case ReserveAndCommit: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
833 flags |= MemPointerRecord::virtual_memory_reserve_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
834 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
835 case Commit: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
836 flags = MemPointerRecord::virtual_memory_commit_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
837 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
838 case Type: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
839 flags |= MemPointerRecord::virtual_memory_type_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
840 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
841 case Uncommit: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
842 assert(pre_reserved_seq, "Need pre-reserve sequence number"); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
843 flags = MemPointerRecord::virtual_memory_uncommit_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
844 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
845 case Release: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
846 assert(pre_reserved_seq, "Need pre-reserve sequence number"); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
847 flags = MemPointerRecord::virtual_memory_release_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
848 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
849 case ArenaSize: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
850 // a bit of hack here, add a small postive offset to arena |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
851 // address for its size record, so the size record is sorted |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
852 // right after arena record. |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
853 flags = MemPointerRecord::arena_size_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
854 addr += sizeof(void*); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
855 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
856 case StackRelease: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
857 flags = MemPointerRecord::virtual_memory_release_tag(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
858 break; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
859 default: |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
860 ShouldNotReachHere(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
861 } |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
862 |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
863 // write memory tracking record |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
864 if (_need_thread_critical_lock) { |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
865 ThreadCritical tc; |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
866 if (_seq == 0) _seq = SequenceGenerator::next(); |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
867 MemTracker::write_tracking_record(addr, flags, size, _seq, pc, _java_thread); |
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868 if (_op == ReserveAndCommit) { |
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869 MemTracker::write_tracking_record(addr, orig_flags | MemPointerRecord::virtual_memory_commit_tag(), |
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870 size, SequenceGenerator::next(), pc, _java_thread); |
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871 } |
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872 if (pre_reserved_seq) MemTracker::dec_pending_op_count(); |
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873 } else { |
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874 if (_seq == 0) _seq = SequenceGenerator::next(); |
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875 MemTracker::write_tracking_record(addr, flags, size, _seq, pc, _java_thread); |
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876 if (_op == ReserveAndCommit) { |
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877 MemTracker::write_tracking_record(addr, orig_flags | MemPointerRecord::virtual_memory_commit_tag(), |
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878 size, SequenceGenerator::next(), pc, _java_thread); |
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879 } |
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880 } |
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881 _seq = 0; |
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882 } |
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883 } |
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884 |