Mercurial > hg > truffle
annotate src/share/vm/services/threadService.cpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
| author | coleenp |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | b1a2afa37ec4 |
| children | 436b4a3231bf |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "memory/allocation.hpp" | |
| 28 #include "memory/heapInspection.hpp" | |
| 29 #include "memory/oopFactory.hpp" | |
| 30 #include "oops/instanceKlass.hpp" | |
| 31 #include "oops/oop.inline.hpp" | |
| 32 #include "runtime/handles.inline.hpp" | |
| 33 #include "runtime/init.hpp" | |
| 34 #include "runtime/thread.hpp" | |
| 35 #include "runtime/vframe.hpp" | |
| 36 #include "runtime/vmThread.hpp" | |
| 37 #include "runtime/vm_operations.hpp" | |
| 38 #include "services/threadService.hpp" | |
| 0 | 39 |
| 40 // TODO: we need to define a naming convention for perf counters | |
| 41 // to distinguish counters for: | |
| 42 // - standard JSR174 use | |
| 43 // - Hotspot extension (public and committed) | |
| 44 // - Hotspot extension (private/internal and uncommitted) | |
| 45 | |
| 46 // Default is disabled. | |
| 47 bool ThreadService::_thread_monitoring_contention_enabled = false; | |
| 48 bool ThreadService::_thread_cpu_time_enabled = false; | |
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49 bool ThreadService::_thread_allocated_memory_enabled = false; |
| 0 | 50 |
| 51 PerfCounter* ThreadService::_total_threads_count = NULL; | |
| 52 PerfVariable* ThreadService::_live_threads_count = NULL; | |
| 53 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
| 54 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
| 55 volatile int ThreadService::_exiting_threads_count = 0; | |
| 56 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
| 57 | |
| 58 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
| 59 | |
| 60 static const int INITIAL_ARRAY_SIZE = 10; | |
| 61 | |
| 62 void ThreadService::init() { | |
| 63 EXCEPTION_MARK; | |
| 64 | |
| 65 // These counters are for java.lang.management API support. | |
| 66 // They are created even if -XX:-UsePerfData is set and in | |
| 67 // that case, they will be allocated on C heap. | |
| 68 | |
| 69 _total_threads_count = | |
| 70 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
| 71 PerfData::U_Events, CHECK); | |
| 72 | |
| 73 _live_threads_count = | |
| 74 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
| 75 PerfData::U_None, CHECK); | |
| 76 | |
| 77 _peak_threads_count = | |
| 78 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
| 79 PerfData::U_None, CHECK); | |
| 80 | |
| 81 _daemon_threads_count = | |
| 82 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
| 83 PerfData::U_None, CHECK); | |
| 84 | |
| 85 if (os::is_thread_cpu_time_supported()) { | |
| 86 _thread_cpu_time_enabled = true; | |
| 87 } | |
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88 |
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89 _thread_allocated_memory_enabled = true; // Always on, so enable it |
| 0 | 90 } |
| 91 | |
| 92 void ThreadService::reset_peak_thread_count() { | |
| 93 // Acquire the lock to update the peak thread count | |
| 94 // to synchronize with thread addition and removal. | |
| 95 MutexLockerEx mu(Threads_lock); | |
| 96 _peak_threads_count->set_value(get_live_thread_count()); | |
| 97 } | |
| 98 | |
| 99 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
| 100 // Do not count VM internal or JVMTI agent threads | |
| 101 if (thread->is_hidden_from_external_view() || | |
| 102 thread->is_jvmti_agent_thread()) { | |
| 103 return; | |
| 104 } | |
| 105 | |
| 106 _total_threads_count->inc(); | |
| 107 _live_threads_count->inc(); | |
| 108 | |
| 109 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
| 110 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
| 111 } | |
| 112 | |
| 113 if (daemon) { | |
| 114 _daemon_threads_count->inc(); | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
| 119 Atomic::dec((jint*) &_exiting_threads_count); | |
| 120 | |
| 121 if (thread->is_hidden_from_external_view() || | |
| 122 thread->is_jvmti_agent_thread()) { | |
| 123 return; | |
| 124 } | |
| 125 | |
| 126 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
| 127 | |
| 128 if (daemon) { | |
| 129 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
| 130 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
| 135 assert(jt == JavaThread::current(), "Called by current thread"); | |
| 136 Atomic::inc((jint*) &_exiting_threads_count); | |
| 137 | |
| 138 oop threadObj = jt->threadObj(); | |
| 139 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
| 140 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // FIXME: JVMTI should call this function | |
| 145 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
| 146 assert(thread != NULL, "should be non-NULL"); | |
| 147 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
| 148 | |
| 149 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
| 150 | |
| 151 oop obj = NULL; | |
| 152 if (wait_obj != NULL) { | |
| 153 // thread is doing an Object.wait() call | |
| 154 obj = (oop) wait_obj->object(); | |
| 155 assert(obj != NULL, "Object.wait() should have an object"); | |
| 156 } else { | |
| 157 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
| 158 if (enter_obj != NULL) { | |
| 159 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
| 160 obj = (oop) enter_obj->object(); | |
| 161 } | |
| 162 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
| 163 } | |
| 164 | |
| 165 Handle h(obj); | |
| 166 return h; | |
| 167 } | |
| 168 | |
| 169 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
| 170 MutexLocker m(Management_lock); | |
| 171 | |
| 172 bool prev = _thread_monitoring_contention_enabled; | |
| 173 _thread_monitoring_contention_enabled = flag; | |
| 174 | |
| 175 return prev; | |
| 176 } | |
| 177 | |
| 178 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
| 179 MutexLocker m(Management_lock); | |
| 180 | |
| 181 bool prev = _thread_cpu_time_enabled; | |
| 182 _thread_cpu_time_enabled = flag; | |
| 183 | |
| 184 return prev; | |
| 185 } | |
| 186 | |
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187 bool ThreadService::set_thread_allocated_memory_enabled(bool flag) { |
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188 MutexLocker m(Management_lock); |
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189 |
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190 bool prev = _thread_allocated_memory_enabled; |
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191 _thread_allocated_memory_enabled = flag; |
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192 |
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193 return prev; |
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194 } |
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195 |
| 0 | 196 // GC support |
| 197 void ThreadService::oops_do(OopClosure* f) { | |
| 198 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
| 199 dump->oops_do(f); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { | |
| 204 MutexLocker ml(Management_lock); | |
| 205 if (_threaddump_list == NULL) { | |
| 206 _threaddump_list = dump; | |
| 207 } else { | |
| 208 dump->set_next(_threaddump_list); | |
| 209 _threaddump_list = dump; | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
| 214 MutexLocker ml(Management_lock); | |
| 215 | |
| 216 ThreadDumpResult* prev = NULL; | |
| 217 bool found = false; | |
| 218 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
| 219 if (d == dump) { | |
| 220 if (prev == NULL) { | |
| 221 _threaddump_list = dump->next(); | |
| 222 } else { | |
| 223 prev->set_next(dump->next()); | |
| 224 } | |
| 225 found = true; | |
| 226 break; | |
| 227 } | |
| 228 } | |
| 229 assert(found, "The threaddump result to be removed must exist."); | |
| 230 } | |
| 231 | |
| 232 // Dump stack trace of threads specified in the given threads array. | |
| 233 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
| 234 // the corresponding entry in the given threads array | |
| 235 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
| 236 int num_threads, | |
| 237 TRAPS) { | |
| 238 assert(num_threads > 0, "just checking"); | |
| 239 | |
| 240 ThreadDumpResult dump_result; | |
| 241 VM_ThreadDump op(&dump_result, | |
| 242 threads, | |
| 243 num_threads, | |
| 244 -1, /* entire stack */ | |
| 245 false, /* with locked monitors */ | |
| 246 false /* with locked synchronizers */); | |
| 247 VMThread::execute(&op); | |
| 248 | |
| 249 // Allocate the resulting StackTraceElement[][] object | |
| 250 | |
| 251 ResourceMark rm(THREAD); | |
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252 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackTraceElement_array(), true, CHECK_NH); |
| 0 | 253 objArrayKlassHandle ik (THREAD, k); |
| 254 objArrayOop r = oopFactory::new_objArray(ik(), num_threads, CHECK_NH); | |
| 255 objArrayHandle result_obj(THREAD, r); | |
| 256 | |
| 257 int num_snapshots = dump_result.num_snapshots(); | |
| 258 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
| 259 int i = 0; | |
| 260 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
| 261 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
| 262 if (stacktrace == NULL) { | |
| 263 // No stack trace | |
| 264 result_obj->obj_at_put(i, NULL); | |
| 265 } else { | |
| 266 // Construct an array of java/lang/StackTraceElement object | |
| 267 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
| 268 result_obj->obj_at_put(i, backtrace_h()); | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 return result_obj; | |
| 273 } | |
| 274 | |
| 275 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
| 276 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 277 if (stat != NULL) { | |
| 278 stat->reset_count_stat(); | |
| 279 } | |
| 280 } | |
| 281 | |
| 282 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
| 283 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 284 if (stat != NULL) { | |
| 285 stat->reset_time_stat(); | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
| 290 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
| 291 // This code was modified from the original Threads::find_deadlocks code. | |
| 292 int globalDfn = 0, thisDfn; | |
| 293 ObjectMonitor* waitingToLockMonitor = NULL; | |
| 294 oop waitingToLockBlocker = NULL; | |
| 295 bool blocked_on_monitor = false; | |
| 296 JavaThread *currentThread, *previousThread; | |
| 297 int num_deadlocks = 0; | |
| 298 | |
| 299 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
| 300 // Initialize the depth-first-number | |
| 301 p->set_depth_first_number(-1); | |
| 302 } | |
| 303 | |
| 304 DeadlockCycle* deadlocks = NULL; | |
| 305 DeadlockCycle* last = NULL; | |
| 306 DeadlockCycle* cycle = new DeadlockCycle(); | |
| 307 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 308 if (jt->depth_first_number() >= 0) { | |
| 309 // this thread was already visited | |
| 310 continue; | |
| 311 } | |
| 312 | |
| 313 thisDfn = globalDfn; | |
| 314 jt->set_depth_first_number(globalDfn++); | |
| 315 previousThread = jt; | |
| 316 currentThread = jt; | |
| 317 | |
| 318 cycle->reset(); | |
| 319 | |
| 320 // When there is a deadlock, all the monitors involved in the dependency | |
| 321 // cycle must be contended and heavyweight. So we only care about the | |
| 322 // heavyweight monitor a thread is waiting to lock. | |
| 323 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
| 324 if (concurrent_locks) { | |
| 325 waitingToLockBlocker = jt->current_park_blocker(); | |
| 326 } | |
| 327 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
| 328 cycle->add_thread(currentThread); | |
| 329 if (waitingToLockMonitor != NULL) { | |
| 330 currentThread = Threads::owning_thread_from_monitor_owner((address)waitingToLockMonitor->owner(), | |
| 331 false /* no locking needed */); | |
| 332 } else { | |
| 333 if (concurrent_locks) { | |
| 334 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 335 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 336 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
| 337 } else { | |
| 338 currentThread = NULL; | |
| 339 } | |
| 340 } | |
| 341 } | |
| 342 | |
| 343 if (currentThread == NULL) { | |
| 344 // No dependency on another thread | |
| 345 break; | |
| 346 } | |
| 347 if (currentThread->depth_first_number() < 0) { | |
| 348 // First visit to this thread | |
| 349 currentThread->set_depth_first_number(globalDfn++); | |
| 350 } else if (currentThread->depth_first_number() < thisDfn) { | |
| 351 // Thread already visited, and not on a (new) cycle | |
| 352 break; | |
| 353 } else if (currentThread == previousThread) { | |
| 354 // Self-loop, ignore | |
| 355 break; | |
| 356 } else { | |
| 357 // We have a (new) cycle | |
| 358 num_deadlocks++; | |
| 359 | |
| 360 cycle->set_deadlock(true); | |
| 361 | |
| 362 // add this cycle to the deadlocks list | |
| 363 if (deadlocks == NULL) { | |
| 364 deadlocks = cycle; | |
| 365 } else { | |
| 366 last->set_next(cycle); | |
| 367 } | |
| 368 last = cycle; | |
| 369 cycle = new DeadlockCycle(); | |
| 370 break; | |
| 371 } | |
| 372 previousThread = currentThread; | |
| 373 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 374 if (concurrent_locks) { | |
| 375 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 } | |
| 380 | |
| 381 return deadlocks; | |
| 382 } | |
| 383 | |
| 384 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 385 | |
| 386 // Create a new ThreadDumpResult object and append to the list. | |
| 387 // If GC happens before this function returns, methodOop | |
| 388 // in the stack trace will be visited. | |
| 389 ThreadService::add_thread_dump(this); | |
| 390 } | |
| 391 | |
| 392 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 393 // Create a new ThreadDumpResult object and append to the list. | |
| 394 // If GC happens before this function returns, oops | |
| 395 // will be visited. | |
| 396 ThreadService::add_thread_dump(this); | |
| 397 } | |
| 398 | |
| 399 ThreadDumpResult::~ThreadDumpResult() { | |
| 400 ThreadService::remove_thread_dump(this); | |
| 401 | |
| 402 // free all the ThreadSnapshot objects created during | |
| 403 // the VM_ThreadDump operation | |
| 404 ThreadSnapshot* ts = _snapshots; | |
| 405 while (ts != NULL) { | |
| 406 ThreadSnapshot* p = ts; | |
| 407 ts = ts->next(); | |
| 408 delete p; | |
| 409 } | |
| 410 } | |
| 411 | |
| 412 | |
| 413 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
| 414 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
| 415 "_num_snapshots must be less than _num_threads"); | |
| 416 _num_snapshots++; | |
| 417 if (_snapshots == NULL) { | |
| 418 _snapshots = ts; | |
| 419 } else { | |
| 420 _last->set_next(ts); | |
| 421 } | |
| 422 _last = ts; | |
| 423 } | |
| 424 | |
| 425 void ThreadDumpResult::oops_do(OopClosure* f) { | |
| 426 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
| 427 ts->oops_do(f); | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { | |
| 432 _method = jvf->method(); | |
| 433 _bci = jvf->bci(); | |
| 434 _locked_monitors = NULL; | |
| 435 if (with_lock_info) { | |
| 436 ResourceMark rm; | |
| 437 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
| 438 int length = list->length(); | |
| 439 if (length > 0) { | |
| 440 _locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(length, true); | |
| 441 for (int i = 0; i < length; i++) { | |
| 442 MonitorInfo* monitor = list->at(i); | |
| 443 assert(monitor->owner(), "This monitor must have an owning object"); | |
| 444 _locked_monitors->append(monitor->owner()); | |
| 445 } | |
| 446 } | |
| 447 } | |
| 448 } | |
| 449 | |
| 450 void StackFrameInfo::oops_do(OopClosure* f) { | |
| 451 f->do_oop((oop*) &_method); | |
| 452 if (_locked_monitors != NULL) { | |
| 453 int length = _locked_monitors->length(); | |
| 454 for (int i = 0; i < length; i++) { | |
| 455 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
| 456 } | |
| 457 } | |
| 458 } | |
| 459 | |
| 460 void StackFrameInfo::print_on(outputStream* st) const { | |
| 461 ResourceMark rm; | |
| 462 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
| 463 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
| 464 for (int i = 0; i < len; i++) { | |
| 465 oop o = _locked_monitors->at(i); | |
| 466 instanceKlass* ik = instanceKlass::cast(o->klass()); | |
| 467 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); | |
| 468 } | |
| 469 | |
| 470 } | |
| 471 | |
| 472 // Iterate through monitor cache to find JNI locked monitors | |
| 473 class InflatedMonitorsClosure: public MonitorClosure { | |
| 474 private: | |
| 475 ThreadStackTrace* _stack_trace; | |
| 476 Thread* _thread; | |
| 477 public: | |
| 478 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
| 479 _thread = t; | |
| 480 _stack_trace = st; | |
| 481 } | |
| 482 void do_monitor(ObjectMonitor* mid) { | |
| 483 if (mid->owner() == _thread) { | |
| 484 oop object = (oop) mid->object(); | |
| 485 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
| 486 _stack_trace->add_jni_locked_monitor(object); | |
| 487 } | |
| 488 } | |
| 489 } | |
| 490 }; | |
| 491 | |
| 492 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
| 493 _thread = t; | |
| 494 _frames = new (ResourceObj::C_HEAP) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); | |
| 495 _depth = 0; | |
| 496 _with_locked_monitors = with_locked_monitors; | |
| 497 if (_with_locked_monitors) { | |
| 498 _jni_locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); | |
| 499 } else { | |
| 500 _jni_locked_monitors = NULL; | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 ThreadStackTrace::~ThreadStackTrace() { | |
| 505 for (int i = 0; i < _frames->length(); i++) { | |
| 506 delete _frames->at(i); | |
| 507 } | |
| 508 delete _frames; | |
| 509 if (_jni_locked_monitors != NULL) { | |
| 510 delete _jni_locked_monitors; | |
| 511 } | |
| 512 } | |
| 513 | |
| 514 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
| 515 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 516 | |
| 517 if (_thread->has_last_Java_frame()) { | |
| 518 RegisterMap reg_map(_thread); | |
| 519 vframe* start_vf = _thread->last_java_vframe(®_map); | |
| 520 int count = 0; | |
| 521 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 522 if (f->is_java_frame()) { | |
| 523 javaVFrame* jvf = javaVFrame::cast(f); | |
| 524 add_stack_frame(jvf); | |
| 525 count++; | |
| 526 } else { | |
| 527 // Ignore non-Java frames | |
| 528 } | |
| 529 if (maxDepth > 0 && count == maxDepth) { | |
| 530 // Skip frames if more than maxDepth | |
| 531 break; | |
| 532 } | |
| 533 } | |
| 534 } | |
| 535 | |
| 536 if (_with_locked_monitors) { | |
| 537 // Iterate inflated monitors and find monitors locked by this thread | |
| 538 // not found in the stack | |
| 539 InflatedMonitorsClosure imc(_thread, this); | |
| 540 ObjectSynchronizer::monitors_iterate(&imc); | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 | |
| 545 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
| 546 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 547 | |
| 548 bool found = false; | |
| 549 int num_frames = get_stack_depth(); | |
| 550 for (int depth = 0; depth < num_frames; depth++) { | |
| 551 StackFrameInfo* frame = stack_frame_at(depth); | |
| 552 int len = frame->num_locked_monitors(); | |
| 553 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
| 554 for (int j = 0; j < len; j++) { | |
| 555 oop monitor = locked_monitors->at(j); | |
| 556 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
| 557 if (monitor == object) { | |
| 558 found = true; | |
| 559 break; | |
| 560 } | |
| 561 } | |
| 562 } | |
| 563 return found; | |
| 564 } | |
| 565 | |
| 566 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
| 1142 | 567 klassOop k = SystemDictionary::StackTraceElement_klass(); |
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568 assert(k != NULL, "must be loaded in 1.4+"); |
| 0 | 569 instanceKlassHandle ik(THREAD, k); |
| 570 | |
| 571 // Allocate an array of java/lang/StackTraceElement object | |
| 572 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
| 573 objArrayHandle backtrace(THREAD, ste); | |
| 574 for (int j = 0; j < _depth; j++) { | |
| 575 StackFrameInfo* frame = _frames->at(j); | |
| 576 methodHandle mh(THREAD, frame->method()); | |
| 577 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
| 578 backtrace->obj_at_put(j, element); | |
| 579 } | |
| 580 return backtrace; | |
| 581 } | |
| 582 | |
| 583 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
| 584 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
| 585 _frames->append(frame); | |
| 586 _depth++; | |
| 587 } | |
| 588 | |
| 589 void ThreadStackTrace::oops_do(OopClosure* f) { | |
| 590 int length = _frames->length(); | |
| 591 for (int i = 0; i < length; i++) { | |
| 592 _frames->at(i)->oops_do(f); | |
| 593 } | |
| 594 | |
| 595 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
| 596 for (int j = 0; j < length; j++) { | |
| 597 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
| 598 } | |
| 599 } | |
| 600 | |
| 601 ConcurrentLocksDump::~ConcurrentLocksDump() { | |
| 602 if (_retain_map_on_free) { | |
| 603 return; | |
| 604 } | |
| 605 | |
| 606 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
| 607 ThreadConcurrentLocks* tcl = t; | |
| 608 t = t->next(); | |
| 609 delete tcl; | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 void ConcurrentLocksDump::dump_at_safepoint() { | |
| 614 // dump all locked concurrent locks | |
| 615 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 616 | |
| 617 if (JDK_Version::is_gte_jdk16x_version()) { | |
| 618 ResourceMark rm; | |
| 619 | |
| 620 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
| 621 | |
| 622 // Find all instances of AbstractOwnableSynchronizer | |
| 623 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
| 624 aos_objects); | |
| 625 // Build a map of thread to its owned AQS locks | |
| 626 build_map(aos_objects); | |
| 627 } | |
| 628 } | |
| 629 | |
| 630 | |
| 631 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
| 632 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
| 633 int length = aos_objects->length(); | |
| 634 for (int i = 0; i < length; i++) { | |
| 635 oop o = aos_objects->at(i); | |
| 636 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
| 637 if (owner_thread_obj != NULL) { | |
| 638 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
| 639 assert(o->is_instance(), "Must be an instanceOop"); | |
| 640 add_lock(thread, (instanceOop) o); | |
| 641 } | |
| 642 } | |
| 643 } | |
| 644 | |
| 645 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
| 646 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
| 647 if (tcl != NULL) { | |
| 648 tcl->add_lock(o); | |
| 649 return; | |
| 650 } | |
| 651 | |
| 652 // First owned lock found for this thread | |
| 653 tcl = new ThreadConcurrentLocks(thread); | |
| 654 tcl->add_lock(o); | |
| 655 if (_map == NULL) { | |
| 656 _map = tcl; | |
| 657 } else { | |
| 658 _last->set_next(tcl); | |
| 659 } | |
| 660 _last = tcl; | |
| 661 } | |
| 662 | |
| 663 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
| 664 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
| 665 if (tcl->java_thread() == thread) { | |
| 666 return tcl; | |
| 667 } | |
| 668 } | |
| 669 return NULL; | |
| 670 } | |
| 671 | |
| 672 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
| 673 st->print_cr(" Locked ownable synchronizers:"); | |
| 674 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
| 675 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
| 676 if (locks == NULL || locks->is_empty()) { | |
| 677 st->print_cr("\t- None"); | |
| 678 st->cr(); | |
| 679 return; | |
| 680 } | |
| 681 | |
| 682 for (int i = 0; i < locks->length(); i++) { | |
| 683 instanceOop obj = locks->at(i); | |
| 684 instanceKlass* ik = instanceKlass::cast(obj->klass()); | |
| 685 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); | |
| 686 } | |
| 687 st->cr(); | |
| 688 } | |
| 689 | |
| 690 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
| 691 _thread = thread; | |
| 692 _owned_locks = new (ResourceObj::C_HEAP) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); | |
| 693 _next = NULL; | |
| 694 } | |
| 695 | |
| 696 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
| 697 delete _owned_locks; | |
| 698 } | |
| 699 | |
| 700 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
| 701 _owned_locks->append(o); | |
| 702 } | |
| 703 | |
| 704 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
| 705 int length = _owned_locks->length(); | |
| 706 for (int i = 0; i < length; i++) { | |
| 707 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
| 708 } | |
| 709 } | |
| 710 | |
| 711 ThreadStatistics::ThreadStatistics() { | |
| 712 _contended_enter_count = 0; | |
| 713 _monitor_wait_count = 0; | |
| 714 _sleep_count = 0; | |
| 715 _count_pending_reset = false; | |
| 716 _timer_pending_reset = false; | |
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717 memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts)); |
| 0 | 718 } |
| 719 | |
| 720 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
| 721 _thread = thread; | |
| 722 _threadObj = thread->threadObj(); | |
| 723 _stack_trace = NULL; | |
| 724 _concurrent_locks = NULL; | |
| 725 _next = NULL; | |
| 726 | |
| 727 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 728 _contended_enter_ticks = stat->contended_enter_ticks(); | |
| 729 _contended_enter_count = stat->contended_enter_count(); | |
| 730 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
| 731 _monitor_wait_count = stat->monitor_wait_count(); | |
| 732 _sleep_ticks = stat->sleep_ticks(); | |
| 733 _sleep_count = stat->sleep_count(); | |
| 734 | |
| 735 _blocker_object = NULL; | |
| 736 _blocker_object_owner = NULL; | |
| 737 | |
| 738 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
| 739 _is_ext_suspended = thread->is_being_ext_suspended(); | |
| 740 _is_in_native = (thread->thread_state() == _thread_in_native); | |
| 741 | |
| 742 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
| 743 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
| 744 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
| 745 | |
| 746 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
| 747 if (obj() == NULL) { | |
| 748 // monitor no longer exists; thread is not blocked | |
| 749 _thread_status = java_lang_Thread::RUNNABLE; | |
| 750 } else { | |
| 751 _blocker_object = obj(); | |
| 752 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
| 753 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
| 754 || (owner != NULL && owner->is_attaching())) { | |
| 755 // ownership information of the monitor is not available | |
| 756 // (may no longer be owned or releasing to some other thread) | |
| 757 // make this thread in RUNNABLE state. | |
| 758 // And when the owner thread is in attaching state, the java thread | |
| 759 // is not completely initialized. For example thread name and id | |
| 760 // and may not be set, so hide the attaching thread. | |
| 761 _thread_status = java_lang_Thread::RUNNABLE; | |
| 762 _blocker_object = NULL; | |
| 763 } else if (owner != NULL) { | |
| 764 _blocker_object_owner = owner->threadObj(); | |
| 765 } | |
| 766 } | |
| 767 } | |
| 768 | |
| 769 // Support for JSR-166 locks | |
| 242 | 770 if (JDK_Version::current().supports_thread_park_blocker() && |
| 0 | 771 (_thread_status == java_lang_Thread::PARKED || |
| 772 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
| 773 | |
| 774 _blocker_object = thread->current_park_blocker(); | |
| 775 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 776 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
| 777 } | |
| 778 } | |
| 779 } | |
| 780 | |
| 781 ThreadSnapshot::~ThreadSnapshot() { | |
| 782 delete _stack_trace; | |
| 783 delete _concurrent_locks; | |
| 784 } | |
| 785 | |
| 786 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
| 787 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
| 788 _stack_trace->dump_stack_at_safepoint(max_depth); | |
| 789 } | |
| 790 | |
| 791 | |
| 792 void ThreadSnapshot::oops_do(OopClosure* f) { | |
| 793 f->do_oop(&_threadObj); | |
| 794 f->do_oop(&_blocker_object); | |
| 795 f->do_oop(&_blocker_object_owner); | |
| 796 if (_stack_trace != NULL) { | |
| 797 _stack_trace->oops_do(f); | |
| 798 } | |
| 799 if (_concurrent_locks != NULL) { | |
| 800 _concurrent_locks->oops_do(f); | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 DeadlockCycle::DeadlockCycle() { | |
| 805 _is_deadlock = false; | |
| 806 _threads = new (ResourceObj::C_HEAP) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); | |
| 807 _next = NULL; | |
| 808 } | |
| 809 | |
| 810 DeadlockCycle::~DeadlockCycle() { | |
| 811 delete _threads; | |
| 812 } | |
| 813 | |
| 814 void DeadlockCycle::print_on(outputStream* st) const { | |
| 815 st->cr(); | |
| 816 st->print_cr("Found one Java-level deadlock:"); | |
| 817 st->print("============================="); | |
| 818 | |
| 819 JavaThread* currentThread; | |
| 820 ObjectMonitor* waitingToLockMonitor; | |
| 821 oop waitingToLockBlocker; | |
| 822 int len = _threads->length(); | |
| 823 for (int i = 0; i < len; i++) { | |
| 824 currentThread = _threads->at(i); | |
| 825 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 826 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 827 st->cr(); | |
| 828 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 829 const char* owner_desc = ",\n which is held by"; | |
| 830 if (waitingToLockMonitor != NULL) { | |
| 831 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
| 832 oop obj = (oop)waitingToLockMonitor->object(); | |
| 833 if (obj != NULL) { | |
| 834 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
| 835 (instanceKlass::cast(obj->klass()))->external_name()); | |
| 836 | |
| 837 if (!currentThread->current_pending_monitor_is_from_java()) { | |
| 838 owner_desc = "\n in JNI, which is held by"; | |
| 839 } | |
| 840 } else { | |
| 841 // No Java object associated - a JVMTI raw monitor | |
| 842 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
| 843 } | |
| 844 currentThread = Threads::owning_thread_from_monitor_owner( | |
| 845 (address)waitingToLockMonitor->owner(), false /* no locking needed */); | |
| 846 } else { | |
| 847 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
| 848 (address)waitingToLockBlocker, | |
| 849 (instanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); | |
| 850 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), | |
| 851 "Must be an AbstractOwnableSynchronizer"); | |
| 852 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 853 currentThread = java_lang_Thread::thread(ownerObj); | |
| 854 } | |
| 855 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
| 856 } | |
| 857 | |
| 858 st->cr(); | |
| 859 st->cr(); | |
| 860 | |
| 861 // Print stack traces | |
| 862 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
| 863 JavaMonitorsInStackTrace = true; | |
| 864 st->print_cr("Java stack information for the threads listed above:"); | |
| 865 st->print_cr("==================================================="); | |
| 866 for (int j = 0; j < len; j++) { | |
| 867 currentThread = _threads->at(j); | |
| 868 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 869 currentThread->print_stack_on(st); | |
| 870 } | |
| 871 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
| 872 } | |
| 873 | |
| 874 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
| 875 bool include_jvmti_agent_threads, | |
| 876 bool include_jni_attaching_threads) { | |
| 877 assert(cur_thread == Thread::current(), "Check current thread"); | |
| 878 | |
| 879 int init_size = ThreadService::get_live_thread_count(); | |
| 880 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
| 881 | |
| 882 MutexLockerEx ml(Threads_lock); | |
| 883 | |
| 884 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 885 // skips JavaThreads in the process of exiting | |
| 886 // and also skips VM internal JavaThreads | |
| 887 // Threads in _thread_new or _thread_new_trans state are included. | |
| 888 // i.e. threads have been started but not yet running. | |
| 889 if (jt->threadObj() == NULL || | |
| 890 jt->is_exiting() || | |
| 891 !java_lang_Thread::is_alive(jt->threadObj()) || | |
| 892 jt->is_hidden_from_external_view()) { | |
| 893 continue; | |
| 894 } | |
| 895 | |
| 896 // skip agent threads | |
| 897 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
| 898 continue; | |
| 899 } | |
| 900 | |
| 901 // skip jni threads in the process of attaching | |
| 902 if (!include_jni_attaching_threads && jt->is_attaching()) { | |
| 903 continue; | |
| 904 } | |
| 905 | |
| 906 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
| 907 _threads_array->append(h); | |
| 908 } | |
| 909 } |