Mercurial > hg > graal-compiler
annotate src/share/vm/services/threadService.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 | 78bbf4d43a14 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2014, 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" | |
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36 #include "runtime/thread.inline.hpp" |
| 1972 | 37 #include "runtime/vmThread.hpp" |
| 38 #include "runtime/vm_operations.hpp" | |
| 39 #include "services/threadService.hpp" | |
| 0 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
| 0 | 43 // TODO: we need to define a naming convention for perf counters |
| 44 // to distinguish counters for: | |
| 45 // - standard JSR174 use | |
| 46 // - Hotspot extension (public and committed) | |
| 47 // - Hotspot extension (private/internal and uncommitted) | |
| 48 | |
| 49 // Default is disabled. | |
| 50 bool ThreadService::_thread_monitoring_contention_enabled = false; | |
| 51 bool ThreadService::_thread_cpu_time_enabled = false; | |
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52 bool ThreadService::_thread_allocated_memory_enabled = false; |
| 0 | 53 |
| 54 PerfCounter* ThreadService::_total_threads_count = NULL; | |
| 55 PerfVariable* ThreadService::_live_threads_count = NULL; | |
| 56 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
| 57 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
| 58 volatile int ThreadService::_exiting_threads_count = 0; | |
| 59 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
| 60 | |
| 61 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
| 62 | |
| 63 static const int INITIAL_ARRAY_SIZE = 10; | |
| 64 | |
| 65 void ThreadService::init() { | |
| 66 EXCEPTION_MARK; | |
| 67 | |
| 68 // These counters are for java.lang.management API support. | |
| 69 // They are created even if -XX:-UsePerfData is set and in | |
| 70 // that case, they will be allocated on C heap. | |
| 71 | |
| 72 _total_threads_count = | |
| 73 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
| 74 PerfData::U_Events, CHECK); | |
| 75 | |
| 76 _live_threads_count = | |
| 77 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
| 78 PerfData::U_None, CHECK); | |
| 79 | |
| 80 _peak_threads_count = | |
| 81 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
| 82 PerfData::U_None, CHECK); | |
| 83 | |
| 84 _daemon_threads_count = | |
| 85 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
| 86 PerfData::U_None, CHECK); | |
| 87 | |
| 88 if (os::is_thread_cpu_time_supported()) { | |
| 89 _thread_cpu_time_enabled = true; | |
| 90 } | |
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91 |
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92 _thread_allocated_memory_enabled = true; // Always on, so enable it |
| 0 | 93 } |
| 94 | |
| 95 void ThreadService::reset_peak_thread_count() { | |
| 96 // Acquire the lock to update the peak thread count | |
| 97 // to synchronize with thread addition and removal. | |
| 98 MutexLockerEx mu(Threads_lock); | |
| 99 _peak_threads_count->set_value(get_live_thread_count()); | |
| 100 } | |
| 101 | |
| 102 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
| 103 // Do not count VM internal or JVMTI agent threads | |
| 104 if (thread->is_hidden_from_external_view() || | |
| 105 thread->is_jvmti_agent_thread()) { | |
| 106 return; | |
| 107 } | |
| 108 | |
| 109 _total_threads_count->inc(); | |
| 110 _live_threads_count->inc(); | |
| 111 | |
| 112 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
| 113 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
| 114 } | |
| 115 | |
| 116 if (daemon) { | |
| 117 _daemon_threads_count->inc(); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
| 122 Atomic::dec((jint*) &_exiting_threads_count); | |
| 123 | |
| 124 if (thread->is_hidden_from_external_view() || | |
| 125 thread->is_jvmti_agent_thread()) { | |
| 126 return; | |
| 127 } | |
| 128 | |
| 129 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
| 130 | |
| 131 if (daemon) { | |
| 132 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
| 133 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
| 138 assert(jt == JavaThread::current(), "Called by current thread"); | |
| 139 Atomic::inc((jint*) &_exiting_threads_count); | |
| 140 | |
| 141 oop threadObj = jt->threadObj(); | |
| 142 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
| 143 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 // FIXME: JVMTI should call this function | |
| 148 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
| 149 assert(thread != NULL, "should be non-NULL"); | |
| 150 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
| 151 | |
| 152 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
| 153 | |
| 154 oop obj = NULL; | |
| 155 if (wait_obj != NULL) { | |
| 156 // thread is doing an Object.wait() call | |
| 157 obj = (oop) wait_obj->object(); | |
| 158 assert(obj != NULL, "Object.wait() should have an object"); | |
| 159 } else { | |
| 160 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
| 161 if (enter_obj != NULL) { | |
| 162 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
| 163 obj = (oop) enter_obj->object(); | |
| 164 } | |
| 165 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
| 166 } | |
| 167 | |
| 168 Handle h(obj); | |
| 169 return h; | |
| 170 } | |
| 171 | |
| 172 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
| 173 MutexLocker m(Management_lock); | |
| 174 | |
| 175 bool prev = _thread_monitoring_contention_enabled; | |
| 176 _thread_monitoring_contention_enabled = flag; | |
| 177 | |
| 178 return prev; | |
| 179 } | |
| 180 | |
| 181 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
| 182 MutexLocker m(Management_lock); | |
| 183 | |
| 184 bool prev = _thread_cpu_time_enabled; | |
| 185 _thread_cpu_time_enabled = flag; | |
| 186 | |
| 187 return prev; | |
| 188 } | |
| 189 | |
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190 bool ThreadService::set_thread_allocated_memory_enabled(bool flag) { |
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191 MutexLocker m(Management_lock); |
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192 |
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193 bool prev = _thread_allocated_memory_enabled; |
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194 _thread_allocated_memory_enabled = flag; |
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195 |
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196 return prev; |
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197 } |
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198 |
| 0 | 199 // GC support |
| 200 void ThreadService::oops_do(OopClosure* f) { | |
| 201 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
| 202 dump->oops_do(f); | |
| 203 } | |
| 204 } | |
| 205 | |
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206 void ThreadService::metadata_do(void f(Metadata*)) { |
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207 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { |
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208 dump->metadata_do(f); |
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209 } |
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210 } |
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211 |
| 0 | 212 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { |
| 213 MutexLocker ml(Management_lock); | |
| 214 if (_threaddump_list == NULL) { | |
| 215 _threaddump_list = dump; | |
| 216 } else { | |
| 217 dump->set_next(_threaddump_list); | |
| 218 _threaddump_list = dump; | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
| 223 MutexLocker ml(Management_lock); | |
| 224 | |
| 225 ThreadDumpResult* prev = NULL; | |
| 226 bool found = false; | |
| 227 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
| 228 if (d == dump) { | |
| 229 if (prev == NULL) { | |
| 230 _threaddump_list = dump->next(); | |
| 231 } else { | |
| 232 prev->set_next(dump->next()); | |
| 233 } | |
| 234 found = true; | |
| 235 break; | |
| 236 } | |
| 237 } | |
| 238 assert(found, "The threaddump result to be removed must exist."); | |
| 239 } | |
| 240 | |
| 241 // Dump stack trace of threads specified in the given threads array. | |
| 242 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
| 243 // the corresponding entry in the given threads array | |
| 244 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
| 245 int num_threads, | |
| 246 TRAPS) { | |
| 247 assert(num_threads > 0, "just checking"); | |
| 248 | |
| 249 ThreadDumpResult dump_result; | |
| 250 VM_ThreadDump op(&dump_result, | |
| 251 threads, | |
| 252 num_threads, | |
| 253 -1, /* entire stack */ | |
| 254 false, /* with locked monitors */ | |
| 255 false /* with locked synchronizers */); | |
| 256 VMThread::execute(&op); | |
| 257 | |
| 258 // Allocate the resulting StackTraceElement[][] object | |
| 259 | |
| 260 ResourceMark rm(THREAD); | |
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261 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackTraceElement_array(), true, CHECK_NH); |
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262 ObjArrayKlass* ik = ObjArrayKlass::cast(k); |
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263 objArrayOop r = oopFactory::new_objArray(ik, num_threads, CHECK_NH); |
| 0 | 264 objArrayHandle result_obj(THREAD, r); |
| 265 | |
| 266 int num_snapshots = dump_result.num_snapshots(); | |
| 267 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
| 268 int i = 0; | |
| 269 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
| 270 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
| 271 if (stacktrace == NULL) { | |
| 272 // No stack trace | |
| 273 result_obj->obj_at_put(i, NULL); | |
| 274 } else { | |
| 275 // Construct an array of java/lang/StackTraceElement object | |
| 276 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
| 277 result_obj->obj_at_put(i, backtrace_h()); | |
| 278 } | |
| 279 } | |
| 280 | |
| 281 return result_obj; | |
| 282 } | |
| 283 | |
| 284 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
| 285 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 286 if (stat != NULL) { | |
| 287 stat->reset_count_stat(); | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
| 292 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 293 if (stat != NULL) { | |
| 294 stat->reset_time_stat(); | |
| 295 } | |
| 296 } | |
| 297 | |
| 298 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
| 299 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
| 300 // This code was modified from the original Threads::find_deadlocks code. | |
| 301 int globalDfn = 0, thisDfn; | |
| 302 ObjectMonitor* waitingToLockMonitor = NULL; | |
| 303 oop waitingToLockBlocker = NULL; | |
| 304 bool blocked_on_monitor = false; | |
| 305 JavaThread *currentThread, *previousThread; | |
| 306 int num_deadlocks = 0; | |
| 307 | |
| 308 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
| 309 // Initialize the depth-first-number | |
| 310 p->set_depth_first_number(-1); | |
| 311 } | |
| 312 | |
| 313 DeadlockCycle* deadlocks = NULL; | |
| 314 DeadlockCycle* last = NULL; | |
| 315 DeadlockCycle* cycle = new DeadlockCycle(); | |
| 316 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 317 if (jt->depth_first_number() >= 0) { | |
| 318 // this thread was already visited | |
| 319 continue; | |
| 320 } | |
| 321 | |
| 322 thisDfn = globalDfn; | |
| 323 jt->set_depth_first_number(globalDfn++); | |
| 324 previousThread = jt; | |
| 325 currentThread = jt; | |
| 326 | |
| 327 cycle->reset(); | |
| 328 | |
| 329 // When there is a deadlock, all the monitors involved in the dependency | |
| 330 // cycle must be contended and heavyweight. So we only care about the | |
| 331 // heavyweight monitor a thread is waiting to lock. | |
| 332 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
| 333 if (concurrent_locks) { | |
| 334 waitingToLockBlocker = jt->current_park_blocker(); | |
| 335 } | |
| 336 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
| 337 cycle->add_thread(currentThread); | |
| 338 if (waitingToLockMonitor != NULL) { | |
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339 address currentOwner = (address)waitingToLockMonitor->owner(); |
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340 if (currentOwner != NULL) { |
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341 currentThread = Threads::owning_thread_from_monitor_owner( |
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342 currentOwner, |
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343 false /* no locking needed */); |
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344 if (currentThread == NULL) { |
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345 // This function is called at a safepoint so the JavaThread |
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346 // that owns waitingToLockMonitor should be findable, but |
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347 // if it is not findable, then the previous currentThread is |
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348 // blocked permanently. We record this as a deadlock. |
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349 num_deadlocks++; |
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350 |
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351 cycle->set_deadlock(true); |
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352 |
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353 // add this cycle to the deadlocks list |
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354 if (deadlocks == NULL) { |
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355 deadlocks = cycle; |
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356 } else { |
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357 last->set_next(cycle); |
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358 } |
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359 last = cycle; |
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360 cycle = new DeadlockCycle(); |
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361 break; |
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362 } |
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363 } |
| 0 | 364 } else { |
| 365 if (concurrent_locks) { | |
| 366 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 367 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 368 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
| 369 } else { | |
| 370 currentThread = NULL; | |
| 371 } | |
| 372 } | |
| 373 } | |
| 374 | |
| 375 if (currentThread == NULL) { | |
| 376 // No dependency on another thread | |
| 377 break; | |
| 378 } | |
| 379 if (currentThread->depth_first_number() < 0) { | |
| 380 // First visit to this thread | |
| 381 currentThread->set_depth_first_number(globalDfn++); | |
| 382 } else if (currentThread->depth_first_number() < thisDfn) { | |
| 383 // Thread already visited, and not on a (new) cycle | |
| 384 break; | |
| 385 } else if (currentThread == previousThread) { | |
| 386 // Self-loop, ignore | |
| 387 break; | |
| 388 } else { | |
| 389 // We have a (new) cycle | |
| 390 num_deadlocks++; | |
| 391 | |
| 392 cycle->set_deadlock(true); | |
| 393 | |
| 394 // add this cycle to the deadlocks list | |
| 395 if (deadlocks == NULL) { | |
| 396 deadlocks = cycle; | |
| 397 } else { | |
| 398 last->set_next(cycle); | |
| 399 } | |
| 400 last = cycle; | |
| 401 cycle = new DeadlockCycle(); | |
| 402 break; | |
| 403 } | |
| 404 previousThread = currentThread; | |
| 405 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 406 if (concurrent_locks) { | |
| 407 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 408 } | |
| 409 } | |
| 410 | |
| 411 } | |
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412 delete cycle; |
| 0 | 413 return deadlocks; |
| 414 } | |
| 415 | |
| 416 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 417 | |
| 418 // Create a new ThreadDumpResult object and append to the list. | |
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419 // If GC happens before this function returns, Method* |
| 0 | 420 // in the stack trace will be visited. |
| 421 ThreadService::add_thread_dump(this); | |
| 422 } | |
| 423 | |
| 424 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
| 425 // Create a new ThreadDumpResult object and append to the list. | |
| 426 // If GC happens before this function returns, oops | |
| 427 // will be visited. | |
| 428 ThreadService::add_thread_dump(this); | |
| 429 } | |
| 430 | |
| 431 ThreadDumpResult::~ThreadDumpResult() { | |
| 432 ThreadService::remove_thread_dump(this); | |
| 433 | |
| 434 // free all the ThreadSnapshot objects created during | |
| 435 // the VM_ThreadDump operation | |
| 436 ThreadSnapshot* ts = _snapshots; | |
| 437 while (ts != NULL) { | |
| 438 ThreadSnapshot* p = ts; | |
| 439 ts = ts->next(); | |
| 440 delete p; | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 | |
| 445 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
| 446 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
| 447 "_num_snapshots must be less than _num_threads"); | |
| 448 _num_snapshots++; | |
| 449 if (_snapshots == NULL) { | |
| 450 _snapshots = ts; | |
| 451 } else { | |
| 452 _last->set_next(ts); | |
| 453 } | |
| 454 _last = ts; | |
| 455 } | |
| 456 | |
| 457 void ThreadDumpResult::oops_do(OopClosure* f) { | |
| 458 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
| 459 ts->oops_do(f); | |
| 460 } | |
| 461 } | |
| 462 | |
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463 void ThreadDumpResult::metadata_do(void f(Metadata*)) { |
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464 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { |
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465 ts->metadata_do(f); |
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466 } |
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467 } |
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468 |
| 0 | 469 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { |
| 470 _method = jvf->method(); | |
| 471 _bci = jvf->bci(); | |
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472 _class_holder = _method->method_holder()->klass_holder(); |
| 0 | 473 _locked_monitors = NULL; |
| 474 if (with_lock_info) { | |
| 475 ResourceMark rm; | |
| 476 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
| 477 int length = list->length(); | |
| 478 if (length > 0) { | |
| 6197 | 479 _locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(length, true); |
| 0 | 480 for (int i = 0; i < length; i++) { |
| 481 MonitorInfo* monitor = list->at(i); | |
| 482 assert(monitor->owner(), "This monitor must have an owning object"); | |
| 483 _locked_monitors->append(monitor->owner()); | |
| 484 } | |
| 485 } | |
| 486 } | |
| 487 } | |
| 488 | |
| 489 void StackFrameInfo::oops_do(OopClosure* f) { | |
| 490 if (_locked_monitors != NULL) { | |
| 491 int length = _locked_monitors->length(); | |
| 492 for (int i = 0; i < length; i++) { | |
| 493 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
| 494 } | |
| 495 } | |
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496 f->do_oop(&_class_holder); |
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497 } |
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498 |
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499 void StackFrameInfo::metadata_do(void f(Metadata*)) { |
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500 f(_method); |
| 0 | 501 } |
| 502 | |
| 503 void StackFrameInfo::print_on(outputStream* st) const { | |
| 504 ResourceMark rm; | |
| 505 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
| 506 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
| 507 for (int i = 0; i < len; i++) { | |
| 508 oop o = _locked_monitors->at(i); | |
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509 InstanceKlass* ik = InstanceKlass::cast(o->klass()); |
| 0 | 510 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); |
| 511 } | |
| 512 | |
| 513 } | |
| 514 | |
| 515 // Iterate through monitor cache to find JNI locked monitors | |
| 516 class InflatedMonitorsClosure: public MonitorClosure { | |
| 517 private: | |
| 518 ThreadStackTrace* _stack_trace; | |
| 519 Thread* _thread; | |
| 520 public: | |
| 521 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
| 522 _thread = t; | |
| 523 _stack_trace = st; | |
| 524 } | |
| 525 void do_monitor(ObjectMonitor* mid) { | |
| 526 if (mid->owner() == _thread) { | |
| 527 oop object = (oop) mid->object(); | |
| 528 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
| 529 _stack_trace->add_jni_locked_monitor(object); | |
| 530 } | |
| 531 } | |
| 532 } | |
| 533 }; | |
| 534 | |
| 535 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
| 536 _thread = t; | |
| 6197 | 537 _frames = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); |
| 0 | 538 _depth = 0; |
| 539 _with_locked_monitors = with_locked_monitors; | |
| 540 if (_with_locked_monitors) { | |
| 6197 | 541 _jni_locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); |
| 0 | 542 } else { |
| 543 _jni_locked_monitors = NULL; | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 ThreadStackTrace::~ThreadStackTrace() { | |
| 548 for (int i = 0; i < _frames->length(); i++) { | |
| 549 delete _frames->at(i); | |
| 550 } | |
| 551 delete _frames; | |
| 552 if (_jni_locked_monitors != NULL) { | |
| 553 delete _jni_locked_monitors; | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
| 558 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 559 | |
| 560 if (_thread->has_last_Java_frame()) { | |
| 561 RegisterMap reg_map(_thread); | |
| 562 vframe* start_vf = _thread->last_java_vframe(®_map); | |
| 563 int count = 0; | |
| 564 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 565 if (f->is_java_frame()) { | |
| 566 javaVFrame* jvf = javaVFrame::cast(f); | |
| 567 add_stack_frame(jvf); | |
| 568 count++; | |
| 569 } else { | |
| 570 // Ignore non-Java frames | |
| 571 } | |
| 572 if (maxDepth > 0 && count == maxDepth) { | |
| 573 // Skip frames if more than maxDepth | |
| 574 break; | |
| 575 } | |
| 576 } | |
| 577 } | |
| 578 | |
| 579 if (_with_locked_monitors) { | |
| 580 // Iterate inflated monitors and find monitors locked by this thread | |
| 581 // not found in the stack | |
| 582 InflatedMonitorsClosure imc(_thread, this); | |
| 583 ObjectSynchronizer::monitors_iterate(&imc); | |
| 584 } | |
| 585 } | |
| 586 | |
| 587 | |
| 588 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
| 589 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 590 | |
| 591 bool found = false; | |
| 592 int num_frames = get_stack_depth(); | |
| 593 for (int depth = 0; depth < num_frames; depth++) { | |
| 594 StackFrameInfo* frame = stack_frame_at(depth); | |
| 595 int len = frame->num_locked_monitors(); | |
| 596 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
| 597 for (int j = 0; j < len; j++) { | |
| 598 oop monitor = locked_monitors->at(j); | |
| 599 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
| 600 if (monitor == object) { | |
| 601 found = true; | |
| 602 break; | |
| 603 } | |
| 604 } | |
| 605 } | |
| 606 return found; | |
| 607 } | |
| 608 | |
| 609 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
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610 Klass* k = SystemDictionary::StackTraceElement_klass(); |
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611 assert(k != NULL, "must be loaded in 1.4+"); |
| 0 | 612 instanceKlassHandle ik(THREAD, k); |
| 613 | |
| 614 // Allocate an array of java/lang/StackTraceElement object | |
| 615 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
| 616 objArrayHandle backtrace(THREAD, ste); | |
| 617 for (int j = 0; j < _depth; j++) { | |
| 618 StackFrameInfo* frame = _frames->at(j); | |
| 619 methodHandle mh(THREAD, frame->method()); | |
| 620 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
| 621 backtrace->obj_at_put(j, element); | |
| 622 } | |
| 623 return backtrace; | |
| 624 } | |
| 625 | |
| 626 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
| 627 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
| 628 _frames->append(frame); | |
| 629 _depth++; | |
| 630 } | |
| 631 | |
| 632 void ThreadStackTrace::oops_do(OopClosure* f) { | |
| 633 int length = _frames->length(); | |
| 634 for (int i = 0; i < length; i++) { | |
| 635 _frames->at(i)->oops_do(f); | |
| 636 } | |
| 637 | |
| 638 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
| 639 for (int j = 0; j < length; j++) { | |
| 640 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
| 641 } | |
| 642 } | |
| 643 | |
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644 void ThreadStackTrace::metadata_do(void f(Metadata*)) { |
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645 int length = _frames->length(); |
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646 for (int i = 0; i < length; i++) { |
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647 _frames->at(i)->metadata_do(f); |
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648 } |
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649 } |
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650 |
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651 |
| 0 | 652 ConcurrentLocksDump::~ConcurrentLocksDump() { |
| 653 if (_retain_map_on_free) { | |
| 654 return; | |
| 655 } | |
| 656 | |
| 657 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
| 658 ThreadConcurrentLocks* tcl = t; | |
| 659 t = t->next(); | |
| 660 delete tcl; | |
| 661 } | |
| 662 } | |
| 663 | |
| 664 void ConcurrentLocksDump::dump_at_safepoint() { | |
| 665 // dump all locked concurrent locks | |
| 666 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 667 | |
| 668 if (JDK_Version::is_gte_jdk16x_version()) { | |
| 669 ResourceMark rm; | |
| 670 | |
| 671 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
| 672 | |
| 673 // Find all instances of AbstractOwnableSynchronizer | |
| 674 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
| 675 aos_objects); | |
| 676 // Build a map of thread to its owned AQS locks | |
| 677 build_map(aos_objects); | |
| 678 } | |
| 679 } | |
| 680 | |
| 681 | |
| 682 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
| 683 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
| 684 int length = aos_objects->length(); | |
| 685 for (int i = 0; i < length; i++) { | |
| 686 oop o = aos_objects->at(i); | |
| 687 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
| 688 if (owner_thread_obj != NULL) { | |
| 689 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
| 690 assert(o->is_instance(), "Must be an instanceOop"); | |
| 691 add_lock(thread, (instanceOop) o); | |
| 692 } | |
| 693 } | |
| 694 } | |
| 695 | |
| 696 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
| 697 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
| 698 if (tcl != NULL) { | |
| 699 tcl->add_lock(o); | |
| 700 return; | |
| 701 } | |
| 702 | |
| 703 // First owned lock found for this thread | |
| 704 tcl = new ThreadConcurrentLocks(thread); | |
| 705 tcl->add_lock(o); | |
| 706 if (_map == NULL) { | |
| 707 _map = tcl; | |
| 708 } else { | |
| 709 _last->set_next(tcl); | |
| 710 } | |
| 711 _last = tcl; | |
| 712 } | |
| 713 | |
| 714 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
| 715 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
| 716 if (tcl->java_thread() == thread) { | |
| 717 return tcl; | |
| 718 } | |
| 719 } | |
| 720 return NULL; | |
| 721 } | |
| 722 | |
| 723 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
| 724 st->print_cr(" Locked ownable synchronizers:"); | |
| 725 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
| 726 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
| 727 if (locks == NULL || locks->is_empty()) { | |
| 728 st->print_cr("\t- None"); | |
| 729 st->cr(); | |
| 730 return; | |
| 731 } | |
| 732 | |
| 733 for (int i = 0; i < locks->length(); i++) { | |
| 734 instanceOop obj = locks->at(i); | |
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735 InstanceKlass* ik = InstanceKlass::cast(obj->klass()); |
| 0 | 736 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); |
| 737 } | |
| 738 st->cr(); | |
| 739 } | |
| 740 | |
| 741 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
| 742 _thread = thread; | |
| 6197 | 743 _owned_locks = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); |
| 0 | 744 _next = NULL; |
| 745 } | |
| 746 | |
| 747 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
| 748 delete _owned_locks; | |
| 749 } | |
| 750 | |
| 751 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
| 752 _owned_locks->append(o); | |
| 753 } | |
| 754 | |
| 755 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
| 756 int length = _owned_locks->length(); | |
| 757 for (int i = 0; i < length; i++) { | |
| 758 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
| 759 } | |
| 760 } | |
| 761 | |
| 762 ThreadStatistics::ThreadStatistics() { | |
| 763 _contended_enter_count = 0; | |
| 764 _monitor_wait_count = 0; | |
| 765 _sleep_count = 0; | |
| 766 _count_pending_reset = false; | |
| 767 _timer_pending_reset = false; | |
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768 memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts)); |
| 0 | 769 } |
| 770 | |
| 771 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
| 772 _thread = thread; | |
| 773 _threadObj = thread->threadObj(); | |
| 774 _stack_trace = NULL; | |
| 775 _concurrent_locks = NULL; | |
| 776 _next = NULL; | |
| 777 | |
| 778 ThreadStatistics* stat = thread->get_thread_stat(); | |
| 779 _contended_enter_ticks = stat->contended_enter_ticks(); | |
| 780 _contended_enter_count = stat->contended_enter_count(); | |
| 781 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
| 782 _monitor_wait_count = stat->monitor_wait_count(); | |
| 783 _sleep_ticks = stat->sleep_ticks(); | |
| 784 _sleep_count = stat->sleep_count(); | |
| 785 | |
| 786 _blocker_object = NULL; | |
| 787 _blocker_object_owner = NULL; | |
| 788 | |
| 789 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
| 790 _is_ext_suspended = thread->is_being_ext_suspended(); | |
| 791 _is_in_native = (thread->thread_state() == _thread_in_native); | |
| 792 | |
| 793 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
| 794 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
| 795 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
| 796 | |
| 797 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
| 798 if (obj() == NULL) { | |
| 799 // monitor no longer exists; thread is not blocked | |
| 800 _thread_status = java_lang_Thread::RUNNABLE; | |
| 801 } else { | |
| 802 _blocker_object = obj(); | |
| 803 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
| 804 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
| 4006 | 805 || (owner != NULL && owner->is_attaching_via_jni())) { |
| 0 | 806 // ownership information of the monitor is not available |
| 807 // (may no longer be owned or releasing to some other thread) | |
| 808 // make this thread in RUNNABLE state. | |
| 809 // And when the owner thread is in attaching state, the java thread | |
| 810 // is not completely initialized. For example thread name and id | |
| 811 // and may not be set, so hide the attaching thread. | |
| 812 _thread_status = java_lang_Thread::RUNNABLE; | |
| 813 _blocker_object = NULL; | |
| 814 } else if (owner != NULL) { | |
| 815 _blocker_object_owner = owner->threadObj(); | |
| 816 } | |
| 817 } | |
| 818 } | |
| 819 | |
| 820 // Support for JSR-166 locks | |
| 242 | 821 if (JDK_Version::current().supports_thread_park_blocker() && |
| 0 | 822 (_thread_status == java_lang_Thread::PARKED || |
| 823 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
| 824 | |
| 825 _blocker_object = thread->current_park_blocker(); | |
| 826 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
| 827 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
| 828 } | |
| 829 } | |
| 830 } | |
| 831 | |
| 832 ThreadSnapshot::~ThreadSnapshot() { | |
| 833 delete _stack_trace; | |
| 834 delete _concurrent_locks; | |
| 835 } | |
| 836 | |
| 837 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
| 838 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
| 839 _stack_trace->dump_stack_at_safepoint(max_depth); | |
| 840 } | |
| 841 | |
| 842 | |
| 843 void ThreadSnapshot::oops_do(OopClosure* f) { | |
| 844 f->do_oop(&_threadObj); | |
| 845 f->do_oop(&_blocker_object); | |
| 846 f->do_oop(&_blocker_object_owner); | |
| 847 if (_stack_trace != NULL) { | |
| 848 _stack_trace->oops_do(f); | |
| 849 } | |
| 850 if (_concurrent_locks != NULL) { | |
| 851 _concurrent_locks->oops_do(f); | |
| 852 } | |
| 853 } | |
| 854 | |
|
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855 void ThreadSnapshot::metadata_do(void f(Metadata*)) { |
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856 if (_stack_trace != NULL) { |
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857 _stack_trace->metadata_do(f); |
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858 } |
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859 } |
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860 |
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861 |
| 0 | 862 DeadlockCycle::DeadlockCycle() { |
| 863 _is_deadlock = false; | |
| 6197 | 864 _threads = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); |
| 0 | 865 _next = NULL; |
| 866 } | |
| 867 | |
| 868 DeadlockCycle::~DeadlockCycle() { | |
| 869 delete _threads; | |
| 870 } | |
| 871 | |
| 872 void DeadlockCycle::print_on(outputStream* st) const { | |
| 873 st->cr(); | |
| 874 st->print_cr("Found one Java-level deadlock:"); | |
| 875 st->print("============================="); | |
| 876 | |
| 877 JavaThread* currentThread; | |
| 878 ObjectMonitor* waitingToLockMonitor; | |
| 879 oop waitingToLockBlocker; | |
| 880 int len = _threads->length(); | |
| 881 for (int i = 0; i < len; i++) { | |
| 882 currentThread = _threads->at(i); | |
| 883 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
| 884 waitingToLockBlocker = currentThread->current_park_blocker(); | |
| 885 st->cr(); | |
| 886 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 887 const char* owner_desc = ",\n which is held by"; | |
| 888 if (waitingToLockMonitor != NULL) { | |
| 889 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
| 890 oop obj = (oop)waitingToLockMonitor->object(); | |
| 891 if (obj != NULL) { | |
| 892 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
|
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893 (InstanceKlass::cast(obj->klass()))->external_name()); |
| 0 | 894 |
| 895 if (!currentThread->current_pending_monitor_is_from_java()) { | |
| 896 owner_desc = "\n in JNI, which is held by"; | |
| 897 } | |
| 898 } else { | |
| 899 // No Java object associated - a JVMTI raw monitor | |
| 900 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
| 901 } | |
| 902 currentThread = Threads::owning_thread_from_monitor_owner( | |
|
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903 (address)waitingToLockMonitor->owner(), |
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904 false /* no locking needed */); |
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905 if (currentThread == NULL) { |
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906 // The deadlock was detected at a safepoint so the JavaThread |
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907 // that owns waitingToLockMonitor should be findable, but |
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908 // if it is not findable, then the previous currentThread is |
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909 // blocked permanently. |
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910 st->print("%s UNKNOWN_owner_addr=" PTR_FORMAT, owner_desc, |
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911 (address)waitingToLockMonitor->owner()); |
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912 continue; |
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913 } |
| 0 | 914 } else { |
| 915 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
| 916 (address)waitingToLockBlocker, | |
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917 (InstanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); |
| 0 | 918 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), |
| 919 "Must be an AbstractOwnableSynchronizer"); | |
| 920 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
| 921 currentThread = java_lang_Thread::thread(ownerObj); | |
| 922 } | |
| 923 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
| 924 } | |
| 925 | |
| 926 st->cr(); | |
| 927 st->cr(); | |
| 928 | |
| 929 // Print stack traces | |
| 930 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
| 931 JavaMonitorsInStackTrace = true; | |
| 932 st->print_cr("Java stack information for the threads listed above:"); | |
| 933 st->print_cr("==================================================="); | |
| 934 for (int j = 0; j < len; j++) { | |
| 935 currentThread = _threads->at(j); | |
| 936 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
| 937 currentThread->print_stack_on(st); | |
| 938 } | |
| 939 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
| 940 } | |
| 941 | |
| 942 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
| 943 bool include_jvmti_agent_threads, | |
| 944 bool include_jni_attaching_threads) { | |
| 945 assert(cur_thread == Thread::current(), "Check current thread"); | |
| 946 | |
| 947 int init_size = ThreadService::get_live_thread_count(); | |
| 948 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
| 949 | |
| 950 MutexLockerEx ml(Threads_lock); | |
| 951 | |
| 952 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 953 // skips JavaThreads in the process of exiting | |
| 954 // and also skips VM internal JavaThreads | |
| 955 // Threads in _thread_new or _thread_new_trans state are included. | |
| 956 // i.e. threads have been started but not yet running. | |
| 957 if (jt->threadObj() == NULL || | |
| 958 jt->is_exiting() || | |
| 959 !java_lang_Thread::is_alive(jt->threadObj()) || | |
| 960 jt->is_hidden_from_external_view()) { | |
| 961 continue; | |
| 962 } | |
| 963 | |
| 964 // skip agent threads | |
| 965 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
| 966 continue; | |
| 967 } | |
| 968 | |
| 969 // skip jni threads in the process of attaching | |
| 4006 | 970 if (!include_jni_attaching_threads && jt->is_attaching_via_jni()) { |
| 0 | 971 continue; |
| 972 } | |
| 973 | |
| 974 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
| 975 _threads_array->append(h); | |
| 976 } | |
| 977 } |