Mercurial > hg > truffle
annotate src/share/vm/services/threadService.cpp @ 242:d95b224e9f17
6721093: -XX:AppendRatio=N not supported
Summary: Add mechanism to ignore unsupported flags for a set period of time
Reviewed-by: acorn, never, coleenp
| author | kamg |
|---|---|
| date | Mon, 28 Jul 2008 14:07:44 -0400 |
| parents | d1605aabd0a1 |
| children | 6a93908f268f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_threadService.cpp.incl" | |
| 27 | |
| 28 // TODO: we need to define a naming convention for perf counters | |
| 29 // to distinguish counters for: | |
| 30 // - standard JSR174 use | |
| 31 // - Hotspot extension (public and committed) | |
| 32 // - Hotspot extension (private/internal and uncommitted) | |
| 33 | |
| 34 // Default is disabled. | |
| 35 bool ThreadService::_thread_monitoring_contention_enabled = false; | |
| 36 bool ThreadService::_thread_cpu_time_enabled = false; | |
| 37 | |
| 38 PerfCounter* ThreadService::_total_threads_count = NULL; | |
| 39 PerfVariable* ThreadService::_live_threads_count = NULL; | |
| 40 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
| 41 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
| 42 volatile int ThreadService::_exiting_threads_count = 0; | |
| 43 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
| 44 | |
| 45 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
| 46 | |
| 47 static const int INITIAL_ARRAY_SIZE = 10; | |
| 48 | |
| 49 void ThreadService::init() { | |
| 50 EXCEPTION_MARK; | |
| 51 | |
| 52 // These counters are for java.lang.management API support. | |
| 53 // They are created even if -XX:-UsePerfData is set and in | |
| 54 // that case, they will be allocated on C heap. | |
| 55 | |
| 56 _total_threads_count = | |
| 57 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
| 58 PerfData::U_Events, CHECK); | |
| 59 | |
| 60 _live_threads_count = | |
| 61 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
| 62 PerfData::U_None, CHECK); | |
| 63 | |
| 64 _peak_threads_count = | |
| 65 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
| 66 PerfData::U_None, CHECK); | |
| 67 | |
| 68 _daemon_threads_count = | |
| 69 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
| 70 PerfData::U_None, CHECK); | |
| 71 | |
| 72 if (os::is_thread_cpu_time_supported()) { | |
| 73 _thread_cpu_time_enabled = true; | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 void ThreadService::reset_peak_thread_count() { | |
| 78 // Acquire the lock to update the peak thread count | |
| 79 // to synchronize with thread addition and removal. | |
| 80 MutexLockerEx mu(Threads_lock); | |
| 81 _peak_threads_count->set_value(get_live_thread_count()); | |
| 82 } | |
| 83 | |
| 84 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
| 85 // Do not count VM internal or JVMTI agent threads | |
| 86 if (thread->is_hidden_from_external_view() || | |
| 87 thread->is_jvmti_agent_thread()) { | |
| 88 return; | |
| 89 } | |
| 90 | |
| 91 _total_threads_count->inc(); | |
| 92 _live_threads_count->inc(); | |
| 93 | |
| 94 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
| 95 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
| 96 } | |
| 97 | |
| 98 if (daemon) { | |
| 99 _daemon_threads_count->inc(); | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
| 104 Atomic::dec((jint*) &_exiting_threads_count); | |
| 105 | |
| 106 if (thread->is_hidden_from_external_view() || | |
| 107 thread->is_jvmti_agent_thread()) { | |
| 108 return; | |
| 109 } | |
| 110 | |
| 111 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
| 112 | |
| 113 if (daemon) { | |
| 114 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
| 115 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
| 120 assert(jt == JavaThread::current(), "Called by current thread"); | |
| 121 Atomic::inc((jint*) &_exiting_threads_count); | |
| 122 | |
| 123 oop threadObj = jt->threadObj(); | |
| 124 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
| 125 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 // FIXME: JVMTI should call this function | |
| 130 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
| 131 assert(thread != NULL, "should be non-NULL"); | |
| 132 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
| 133 | |
| 134 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
| 135 | |
| 136 oop obj = NULL; | |
| 137 if (wait_obj != NULL) { | |
| 138 // thread is doing an Object.wait() call | |
| 139 obj = (oop) wait_obj->object(); | |
| 140 assert(obj != NULL, "Object.wait() should have an object"); | |
| 141 } else { | |
| 142 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
| 143 if (enter_obj != NULL) { | |
| 144 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
| 145 obj = (oop) enter_obj->object(); | |
| 146 } | |
| 147 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
| 148 } | |
| 149 | |
| 150 Handle h(obj); | |
| 151 return h; | |
| 152 } | |
| 153 | |
| 154 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
| 155 MutexLocker m(Management_lock); | |
| 156 | |
| 157 bool prev = _thread_monitoring_contention_enabled; | |
| 158 _thread_monitoring_contention_enabled = flag; | |
| 159 | |
| 160 return prev; | |
| 161 } | |
| 162 | |
| 163 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
| 164 MutexLocker m(Management_lock); | |
| 165 | |
| 166 bool prev = _thread_cpu_time_enabled; | |
| 167 _thread_cpu_time_enabled = flag; | |
| 168 | |
| 169 return prev; | |
| 170 } | |
| 171 | |
| 172 // GC support | |
| 173 void ThreadService::oops_do(OopClosure* f) { | |
| 174 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
| 175 dump->oops_do(f); | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { | |
| 180 MutexLocker ml(Management_lock); | |
| 181 if (_threaddump_list == NULL) { | |
| 182 _threaddump_list = dump; | |
| 183 } else { | |
| 184 dump->set_next(_threaddump_list); | |
| 185 _threaddump_list = dump; | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
| 190 MutexLocker ml(Management_lock); | |
| 191 | |
| 192 ThreadDumpResult* prev = NULL; | |
| 193 bool found = false; | |
| 194 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
| 195 if (d == dump) { | |
| 196 if (prev == NULL) { | |
| 197 _threaddump_list = dump->next(); | |
| 198 } else { | |
| 199 prev->set_next(dump->next()); | |
| 200 } | |
| 201 found = true; | |
| 202 break; | |
| 203 } | |
| 204 } | |
| 205 assert(found, "The threaddump result to be removed must exist."); | |
| 206 } | |
| 207 | |
| 208 // Dump stack trace of threads specified in the given threads array. | |
| 209 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
| 210 // the corresponding entry in the given threads array | |
| 211 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
| 212 int num_threads, | |
| 213 TRAPS) { | |
| 214 assert(num_threads > 0, "just checking"); | |
| 215 | |
| 216 ThreadDumpResult dump_result; | |
| 217 VM_ThreadDump op(&dump_result, | |
| 218 threads, | |
| 219 num_threads, | |
| 220 -1, /* entire stack */ | |
| 221 false, /* with locked monitors */ | |
| 222 false /* with locked synchronizers */); | |
| 223 VMThread::execute(&op); | |
| 224 | |
| 225 // Allocate the resulting StackTraceElement[][] object | |
| 226 | |
| 227 ResourceMark rm(THREAD); | |
| 228 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_StackTraceElement_array(), true, CHECK_NH); | |
| 229 objArrayKlassHandle ik (THREAD, k); | |
| 230 objArrayOop r = oopFactory::new_objArray(ik(), num_threads, CHECK_NH); | |
| 231 objArrayHandle result_obj(THREAD, r); | |
| 232 | |
| 233 int num_snapshots = dump_result.num_snapshots(); | |
| 234 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
| 235 int i = 0; | |
| 236 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
| 237 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
| 238 if (stacktrace == NULL) { | |
| 239 // No stack trace | |
| 240 result_obj->obj_at_put(i, NULL); | |
| 241 } else { | |
| 242 // Construct an array of java/lang/StackTraceElement object | |
| 243 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
| 244 result_obj->obj_at_put(i, backtrace_h()); | |
| 245 } | |
| 246 } | |
| 247 | |
| 248 return result_obj; | |
| 249 } | |
| 250 | |
| 251 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
| 252 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 253 if (stat != NULL) { | |
| 254 stat->reset_count_stat(); | |
| 255 } | |
| 256 } | |
| 257 | |
| 258 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
| 259 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 260 if (stat != NULL) { | |
| 261 stat->reset_time_stat(); | |
| 262 } | |
| 263 } | |
| 264 | |
| 265 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
| 266 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
| 267 // This code was modified from the original Threads::find_deadlocks code. | |
| 268 int globalDfn = 0, thisDfn; | |
| 269 ObjectMonitor* waitingToLockMonitor = NULL; | |
| 270 oop waitingToLockBlocker = NULL; | |
| 271 bool blocked_on_monitor = false; | |
| 272 JavaThread *currentThread, *previousThread; | |
| 273 int num_deadlocks = 0; | |
| 274 | |
| 275 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
| 276 // Initialize the depth-first-number | |
| 277 p->set_depth_first_number(-1); | |
| 278 } | |
| 279 | |
| 280 DeadlockCycle* deadlocks = NULL; | |
| 281 DeadlockCycle* last = NULL; | |
| 282 DeadlockCycle* cycle = new DeadlockCycle(); | |
| 283 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 284 if (jt->depth_first_number() >= 0) { | |
| 285 // this thread was already visited | |
| 286 continue; | |
| 287 } | |
| 288 | |
| 289 thisDfn = globalDfn; | |
| 290 jt->set_depth_first_number(globalDfn++); | |
| 291 previousThread = jt; | |
| 292 currentThread = jt; | |
| 293 | |
| 294 cycle->reset(); | |
| 295 | |
| 296 // When there is a deadlock, all the monitors involved in the dependency | |
| 297 // cycle must be contended and heavyweight. So we only care about the | |
| 298 // heavyweight monitor a thread is waiting to lock. | |
| 299 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
| 300 if (concurrent_locks) { | |
| 301 waitingToLockBlocker = jt->current_park_blocker(); | |
| 302 } | |
| 303 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
| 304 cycle->add_thread(currentThread); | |
| 305 if (waitingToLockMonitor != NULL) { | |
| 306 currentThread = Threads::owning_thread_from_monitor_owner((address)waitingToLockMonitor->owner(), | |
| 307 false /* no locking needed */); | |
| 308 } else { | |
| 309 if (concurrent_locks) { | |
| 310 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 311 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 312 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
| 313 } else { | |
| 314 currentThread = NULL; | |
| 315 } | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 if (currentThread == NULL) { | |
| 320 // No dependency on another thread | |
| 321 break; | |
| 322 } | |
| 323 if (currentThread->depth_first_number() < 0) { | |
| 324 // First visit to this thread | |
| 325 currentThread->set_depth_first_number(globalDfn++); | |
| 326 } else if (currentThread->depth_first_number() < thisDfn) { | |
| 327 // Thread already visited, and not on a (new) cycle | |
| 328 break; | |
| 329 } else if (currentThread == previousThread) { | |
| 330 // Self-loop, ignore | |
| 331 break; | |
| 332 } else { | |
| 333 // We have a (new) cycle | |
| 334 num_deadlocks++; | |
| 335 | |
| 336 cycle->set_deadlock(true); | |
| 337 | |
| 338 // add this cycle to the deadlocks list | |
| 339 if (deadlocks == NULL) { | |
| 340 deadlocks = cycle; | |
| 341 } else { | |
| 342 last->set_next(cycle); | |
| 343 } | |
| 344 last = cycle; | |
| 345 cycle = new DeadlockCycle(); | |
| 346 break; | |
| 347 } | |
| 348 previousThread = currentThread; | |
| 349 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 350 if (concurrent_locks) { | |
| 351 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 } | |
| 356 | |
| 357 return deadlocks; | |
| 358 } | |
| 359 | |
| 360 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 361 | |
| 362 // Create a new ThreadDumpResult object and append to the list. | |
| 363 // If GC happens before this function returns, methodOop | |
| 364 // in the stack trace will be visited. | |
| 365 ThreadService::add_thread_dump(this); | |
| 366 } | |
| 367 | |
| 368 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 369 // Create a new ThreadDumpResult object and append to the list. | |
| 370 // If GC happens before this function returns, oops | |
| 371 // will be visited. | |
| 372 ThreadService::add_thread_dump(this); | |
| 373 } | |
| 374 | |
| 375 ThreadDumpResult::~ThreadDumpResult() { | |
| 376 ThreadService::remove_thread_dump(this); | |
| 377 | |
| 378 // free all the ThreadSnapshot objects created during | |
| 379 // the VM_ThreadDump operation | |
| 380 ThreadSnapshot* ts = _snapshots; | |
| 381 while (ts != NULL) { | |
| 382 ThreadSnapshot* p = ts; | |
| 383 ts = ts->next(); | |
| 384 delete p; | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 | |
| 389 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
| 390 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
| 391 "_num_snapshots must be less than _num_threads"); | |
| 392 _num_snapshots++; | |
| 393 if (_snapshots == NULL) { | |
| 394 _snapshots = ts; | |
| 395 } else { | |
| 396 _last->set_next(ts); | |
| 397 } | |
| 398 _last = ts; | |
| 399 } | |
| 400 | |
| 401 void ThreadDumpResult::oops_do(OopClosure* f) { | |
| 402 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
| 403 ts->oops_do(f); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { | |
| 408 _method = jvf->method(); | |
| 409 _bci = jvf->bci(); | |
| 410 _locked_monitors = NULL; | |
| 411 if (with_lock_info) { | |
| 412 ResourceMark rm; | |
| 413 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
| 414 int length = list->length(); | |
| 415 if (length > 0) { | |
| 416 _locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(length, true); | |
| 417 for (int i = 0; i < length; i++) { | |
| 418 MonitorInfo* monitor = list->at(i); | |
| 419 assert(monitor->owner(), "This monitor must have an owning object"); | |
| 420 _locked_monitors->append(monitor->owner()); | |
| 421 } | |
| 422 } | |
| 423 } | |
| 424 } | |
| 425 | |
| 426 void StackFrameInfo::oops_do(OopClosure* f) { | |
| 427 f->do_oop((oop*) &_method); | |
| 428 if (_locked_monitors != NULL) { | |
| 429 int length = _locked_monitors->length(); | |
| 430 for (int i = 0; i < length; i++) { | |
| 431 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
| 432 } | |
| 433 } | |
| 434 } | |
| 435 | |
| 436 void StackFrameInfo::print_on(outputStream* st) const { | |
| 437 ResourceMark rm; | |
| 438 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
| 439 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
| 440 for (int i = 0; i < len; i++) { | |
| 441 oop o = _locked_monitors->at(i); | |
| 442 instanceKlass* ik = instanceKlass::cast(o->klass()); | |
| 443 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); | |
| 444 } | |
| 445 | |
| 446 } | |
| 447 | |
| 448 // Iterate through monitor cache to find JNI locked monitors | |
| 449 class InflatedMonitorsClosure: public MonitorClosure { | |
| 450 private: | |
| 451 ThreadStackTrace* _stack_trace; | |
| 452 Thread* _thread; | |
| 453 public: | |
| 454 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
| 455 _thread = t; | |
| 456 _stack_trace = st; | |
| 457 } | |
| 458 void do_monitor(ObjectMonitor* mid) { | |
| 459 if (mid->owner() == _thread) { | |
| 460 oop object = (oop) mid->object(); | |
| 461 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
| 462 _stack_trace->add_jni_locked_monitor(object); | |
| 463 } | |
| 464 } | |
| 465 } | |
| 466 }; | |
| 467 | |
| 468 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
| 469 _thread = t; | |
| 470 _frames = new (ResourceObj::C_HEAP) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); | |
| 471 _depth = 0; | |
| 472 _with_locked_monitors = with_locked_monitors; | |
| 473 if (_with_locked_monitors) { | |
| 474 _jni_locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); | |
| 475 } else { | |
| 476 _jni_locked_monitors = NULL; | |
| 477 } | |
| 478 } | |
| 479 | |
| 480 ThreadStackTrace::~ThreadStackTrace() { | |
| 481 for (int i = 0; i < _frames->length(); i++) { | |
| 482 delete _frames->at(i); | |
| 483 } | |
| 484 delete _frames; | |
| 485 if (_jni_locked_monitors != NULL) { | |
| 486 delete _jni_locked_monitors; | |
| 487 } | |
| 488 } | |
| 489 | |
| 490 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
| 491 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 492 | |
| 493 if (_thread->has_last_Java_frame()) { | |
| 494 RegisterMap reg_map(_thread); | |
| 495 vframe* start_vf = _thread->last_java_vframe(®_map); | |
| 496 int count = 0; | |
| 497 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 498 if (f->is_java_frame()) { | |
| 499 javaVFrame* jvf = javaVFrame::cast(f); | |
| 500 add_stack_frame(jvf); | |
| 501 count++; | |
| 502 } else { | |
| 503 // Ignore non-Java frames | |
| 504 } | |
| 505 if (maxDepth > 0 && count == maxDepth) { | |
| 506 // Skip frames if more than maxDepth | |
| 507 break; | |
| 508 } | |
| 509 } | |
| 510 } | |
| 511 | |
| 512 if (_with_locked_monitors) { | |
| 513 // Iterate inflated monitors and find monitors locked by this thread | |
| 514 // not found in the stack | |
| 515 InflatedMonitorsClosure imc(_thread, this); | |
| 516 ObjectSynchronizer::monitors_iterate(&imc); | |
| 517 } | |
| 518 } | |
| 519 | |
| 520 | |
| 521 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
| 522 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 523 | |
| 524 bool found = false; | |
| 525 int num_frames = get_stack_depth(); | |
| 526 for (int depth = 0; depth < num_frames; depth++) { | |
| 527 StackFrameInfo* frame = stack_frame_at(depth); | |
| 528 int len = frame->num_locked_monitors(); | |
| 529 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
| 530 for (int j = 0; j < len; j++) { | |
| 531 oop monitor = locked_monitors->at(j); | |
| 532 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
| 533 if (monitor == object) { | |
| 534 found = true; | |
| 535 break; | |
| 536 } | |
| 537 } | |
| 538 } | |
| 539 return found; | |
| 540 } | |
| 541 | |
| 542 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
| 543 klassOop k = SystemDictionary::stackTraceElement_klass(); | |
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60b728ec77c1
6652736: well known classes in system dictionary are inefficiently processed
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|
544 assert(k != NULL, "must be loaded in 1.4+"); |
| 0 | 545 instanceKlassHandle ik(THREAD, k); |
| 546 | |
| 547 // Allocate an array of java/lang/StackTraceElement object | |
| 548 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
| 549 objArrayHandle backtrace(THREAD, ste); | |
| 550 for (int j = 0; j < _depth; j++) { | |
| 551 StackFrameInfo* frame = _frames->at(j); | |
| 552 methodHandle mh(THREAD, frame->method()); | |
| 553 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
| 554 backtrace->obj_at_put(j, element); | |
| 555 } | |
| 556 return backtrace; | |
| 557 } | |
| 558 | |
| 559 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
| 560 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
| 561 _frames->append(frame); | |
| 562 _depth++; | |
| 563 } | |
| 564 | |
| 565 void ThreadStackTrace::oops_do(OopClosure* f) { | |
| 566 int length = _frames->length(); | |
| 567 for (int i = 0; i < length; i++) { | |
| 568 _frames->at(i)->oops_do(f); | |
| 569 } | |
| 570 | |
| 571 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
| 572 for (int j = 0; j < length; j++) { | |
| 573 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
| 574 } | |
| 575 } | |
| 576 | |
| 577 ConcurrentLocksDump::~ConcurrentLocksDump() { | |
| 578 if (_retain_map_on_free) { | |
| 579 return; | |
| 580 } | |
| 581 | |
| 582 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
| 583 ThreadConcurrentLocks* tcl = t; | |
| 584 t = t->next(); | |
| 585 delete tcl; | |
| 586 } | |
| 587 } | |
| 588 | |
| 589 void ConcurrentLocksDump::dump_at_safepoint() { | |
| 590 // dump all locked concurrent locks | |
| 591 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 592 | |
| 593 if (JDK_Version::is_gte_jdk16x_version()) { | |
| 594 ResourceMark rm; | |
| 595 | |
| 596 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
| 597 | |
| 598 // Find all instances of AbstractOwnableSynchronizer | |
| 599 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
| 600 aos_objects); | |
| 601 // Build a map of thread to its owned AQS locks | |
| 602 build_map(aos_objects); | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 | |
| 607 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
| 608 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
| 609 int length = aos_objects->length(); | |
| 610 for (int i = 0; i < length; i++) { | |
| 611 oop o = aos_objects->at(i); | |
| 612 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
| 613 if (owner_thread_obj != NULL) { | |
| 614 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
| 615 assert(o->is_instance(), "Must be an instanceOop"); | |
| 616 add_lock(thread, (instanceOop) o); | |
| 617 } | |
| 618 } | |
| 619 } | |
| 620 | |
| 621 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
| 622 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
| 623 if (tcl != NULL) { | |
| 624 tcl->add_lock(o); | |
| 625 return; | |
| 626 } | |
| 627 | |
| 628 // First owned lock found for this thread | |
| 629 tcl = new ThreadConcurrentLocks(thread); | |
| 630 tcl->add_lock(o); | |
| 631 if (_map == NULL) { | |
| 632 _map = tcl; | |
| 633 } else { | |
| 634 _last->set_next(tcl); | |
| 635 } | |
| 636 _last = tcl; | |
| 637 } | |
| 638 | |
| 639 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
| 640 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
| 641 if (tcl->java_thread() == thread) { | |
| 642 return tcl; | |
| 643 } | |
| 644 } | |
| 645 return NULL; | |
| 646 } | |
| 647 | |
| 648 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
| 649 st->print_cr(" Locked ownable synchronizers:"); | |
| 650 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
| 651 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
| 652 if (locks == NULL || locks->is_empty()) { | |
| 653 st->print_cr("\t- None"); | |
| 654 st->cr(); | |
| 655 return; | |
| 656 } | |
| 657 | |
| 658 for (int i = 0; i < locks->length(); i++) { | |
| 659 instanceOop obj = locks->at(i); | |
| 660 instanceKlass* ik = instanceKlass::cast(obj->klass()); | |
| 661 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); | |
| 662 } | |
| 663 st->cr(); | |
| 664 } | |
| 665 | |
| 666 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
| 667 _thread = thread; | |
| 668 _owned_locks = new (ResourceObj::C_HEAP) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); | |
| 669 _next = NULL; | |
| 670 } | |
| 671 | |
| 672 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
| 673 delete _owned_locks; | |
| 674 } | |
| 675 | |
| 676 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
| 677 _owned_locks->append(o); | |
| 678 } | |
| 679 | |
| 680 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
| 681 int length = _owned_locks->length(); | |
| 682 for (int i = 0; i < length; i++) { | |
| 683 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
| 684 } | |
| 685 } | |
| 686 | |
| 687 ThreadStatistics::ThreadStatistics() { | |
| 688 _contended_enter_count = 0; | |
| 689 _monitor_wait_count = 0; | |
| 690 _sleep_count = 0; | |
| 691 _class_init_recursion_count = 0; | |
| 692 _class_verify_recursion_count = 0; | |
| 693 _count_pending_reset = false; | |
| 694 _timer_pending_reset = false; | |
| 695 } | |
| 696 | |
| 697 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
| 698 _thread = thread; | |
| 699 _threadObj = thread->threadObj(); | |
| 700 _stack_trace = NULL; | |
| 701 _concurrent_locks = NULL; | |
| 702 _next = NULL; | |
| 703 | |
| 704 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 705 _contended_enter_ticks = stat->contended_enter_ticks(); | |
| 706 _contended_enter_count = stat->contended_enter_count(); | |
| 707 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
| 708 _monitor_wait_count = stat->monitor_wait_count(); | |
| 709 _sleep_ticks = stat->sleep_ticks(); | |
| 710 _sleep_count = stat->sleep_count(); | |
| 711 | |
| 712 _blocker_object = NULL; | |
| 713 _blocker_object_owner = NULL; | |
| 714 | |
| 715 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
| 716 _is_ext_suspended = thread->is_being_ext_suspended(); | |
| 717 _is_in_native = (thread->thread_state() == _thread_in_native); | |
| 718 | |
| 719 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
| 720 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
| 721 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
| 722 | |
| 723 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
| 724 if (obj() == NULL) { | |
| 725 // monitor no longer exists; thread is not blocked | |
| 726 _thread_status = java_lang_Thread::RUNNABLE; | |
| 727 } else { | |
| 728 _blocker_object = obj(); | |
| 729 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
| 730 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
| 731 || (owner != NULL && owner->is_attaching())) { | |
| 732 // ownership information of the monitor is not available | |
| 733 // (may no longer be owned or releasing to some other thread) | |
| 734 // make this thread in RUNNABLE state. | |
| 735 // And when the owner thread is in attaching state, the java thread | |
| 736 // is not completely initialized. For example thread name and id | |
| 737 // and may not be set, so hide the attaching thread. | |
| 738 _thread_status = java_lang_Thread::RUNNABLE; | |
| 739 _blocker_object = NULL; | |
| 740 } else if (owner != NULL) { | |
| 741 _blocker_object_owner = owner->threadObj(); | |
| 742 } | |
| 743 } | |
| 744 } | |
| 745 | |
| 746 // Support for JSR-166 locks | |
| 242 | 747 if (JDK_Version::current().supports_thread_park_blocker() && |
| 0 | 748 (_thread_status == java_lang_Thread::PARKED || |
| 749 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
| 750 | |
| 751 _blocker_object = thread->current_park_blocker(); | |
| 752 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 753 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
| 754 } | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 ThreadSnapshot::~ThreadSnapshot() { | |
| 759 delete _stack_trace; | |
| 760 delete _concurrent_locks; | |
| 761 } | |
| 762 | |
| 763 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
| 764 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
| 765 _stack_trace->dump_stack_at_safepoint(max_depth); | |
| 766 } | |
| 767 | |
| 768 | |
| 769 void ThreadSnapshot::oops_do(OopClosure* f) { | |
| 770 f->do_oop(&_threadObj); | |
| 771 f->do_oop(&_blocker_object); | |
| 772 f->do_oop(&_blocker_object_owner); | |
| 773 if (_stack_trace != NULL) { | |
| 774 _stack_trace->oops_do(f); | |
| 775 } | |
| 776 if (_concurrent_locks != NULL) { | |
| 777 _concurrent_locks->oops_do(f); | |
| 778 } | |
| 779 } | |
| 780 | |
| 781 DeadlockCycle::DeadlockCycle() { | |
| 782 _is_deadlock = false; | |
| 783 _threads = new (ResourceObj::C_HEAP) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); | |
| 784 _next = NULL; | |
| 785 } | |
| 786 | |
| 787 DeadlockCycle::~DeadlockCycle() { | |
| 788 delete _threads; | |
| 789 } | |
| 790 | |
| 791 void DeadlockCycle::print_on(outputStream* st) const { | |
| 792 st->cr(); | |
| 793 st->print_cr("Found one Java-level deadlock:"); | |
| 794 st->print("============================="); | |
| 795 | |
| 796 JavaThread* currentThread; | |
| 797 ObjectMonitor* waitingToLockMonitor; | |
| 798 oop waitingToLockBlocker; | |
| 799 int len = _threads->length(); | |
| 800 for (int i = 0; i < len; i++) { | |
| 801 currentThread = _threads->at(i); | |
| 802 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 803 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 804 st->cr(); | |
| 805 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 806 const char* owner_desc = ",\n which is held by"; | |
| 807 if (waitingToLockMonitor != NULL) { | |
| 808 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
| 809 oop obj = (oop)waitingToLockMonitor->object(); | |
| 810 if (obj != NULL) { | |
| 811 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
| 812 (instanceKlass::cast(obj->klass()))->external_name()); | |
| 813 | |
| 814 if (!currentThread->current_pending_monitor_is_from_java()) { | |
| 815 owner_desc = "\n in JNI, which is held by"; | |
| 816 } | |
| 817 } else { | |
| 818 // No Java object associated - a JVMTI raw monitor | |
| 819 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
| 820 } | |
| 821 currentThread = Threads::owning_thread_from_monitor_owner( | |
| 822 (address)waitingToLockMonitor->owner(), false /* no locking needed */); | |
| 823 } else { | |
| 824 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
| 825 (address)waitingToLockBlocker, | |
| 826 (instanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); | |
| 827 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), | |
| 828 "Must be an AbstractOwnableSynchronizer"); | |
| 829 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 830 currentThread = java_lang_Thread::thread(ownerObj); | |
| 831 } | |
| 832 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
| 833 } | |
| 834 | |
| 835 st->cr(); | |
| 836 st->cr(); | |
| 837 | |
| 838 // Print stack traces | |
| 839 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
| 840 JavaMonitorsInStackTrace = true; | |
| 841 st->print_cr("Java stack information for the threads listed above:"); | |
| 842 st->print_cr("==================================================="); | |
| 843 for (int j = 0; j < len; j++) { | |
| 844 currentThread = _threads->at(j); | |
| 845 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 846 currentThread->print_stack_on(st); | |
| 847 } | |
| 848 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
| 849 } | |
| 850 | |
| 851 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
| 852 bool include_jvmti_agent_threads, | |
| 853 bool include_jni_attaching_threads) { | |
| 854 assert(cur_thread == Thread::current(), "Check current thread"); | |
| 855 | |
| 856 int init_size = ThreadService::get_live_thread_count(); | |
| 857 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
| 858 | |
| 859 MutexLockerEx ml(Threads_lock); | |
| 860 | |
| 861 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 862 // skips JavaThreads in the process of exiting | |
| 863 // and also skips VM internal JavaThreads | |
| 864 // Threads in _thread_new or _thread_new_trans state are included. | |
| 865 // i.e. threads have been started but not yet running. | |
| 866 if (jt->threadObj() == NULL || | |
| 867 jt->is_exiting() || | |
| 868 !java_lang_Thread::is_alive(jt->threadObj()) || | |
| 869 jt->is_hidden_from_external_view()) { | |
| 870 continue; | |
| 871 } | |
| 872 | |
| 873 // skip agent threads | |
| 874 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
| 875 continue; | |
| 876 } | |
| 877 | |
| 878 // skip jni threads in the process of attaching | |
| 879 if (!include_jni_attaching_threads && jt->is_attaching()) { | |
| 880 continue; | |
| 881 } | |
| 882 | |
| 883 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
| 884 _threads_array->append(h); | |
| 885 } | |
| 886 } |