Mercurial > hg > truffle
annotate src/share/vm/services/threadService.hpp @ 875:6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
Summary: Add new jvmstat counters to measure detailed class loading time
Reviewed-by: acorn, kamg
| author | mchung |
|---|---|
| date | Fri, 10 Jul 2009 11:10:00 -0700 |
| parents | ad8c8ca4ab0f |
| children | 89e0543e1737 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 470 | 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 class OopClosure; | |
| 26 class ThreadDumpResult; | |
| 27 class ThreadStackTrace; | |
| 28 class ThreadSnapshot; | |
| 29 class StackFrameInfo; | |
| 30 class ThreadConcurrentLocks; | |
| 31 class DeadlockCycle; | |
| 32 | |
| 33 // VM monitoring and management support for the thread and | |
| 34 // synchronization subsystem | |
| 35 // | |
| 36 // Thread contention monitoring is disabled by default. | |
| 37 // When enabled, the VM will begin measuring the accumulated | |
| 38 // elapsed time a thread blocked on synchronization. | |
| 39 // | |
| 40 class ThreadService : public AllStatic { | |
| 41 private: | |
| 42 // These counters could be moved to Threads class | |
| 43 static PerfCounter* _total_threads_count; | |
| 44 static PerfVariable* _live_threads_count; | |
| 45 static PerfVariable* _peak_threads_count; | |
| 46 static PerfVariable* _daemon_threads_count; | |
| 47 | |
| 48 // These 2 counters are atomically incremented once the thread is exiting. | |
| 49 // They will be atomically decremented when ThreadService::remove_thread is called. | |
| 50 static volatile int _exiting_threads_count; | |
| 51 static volatile int _exiting_daemon_threads_count; | |
| 52 | |
| 53 static bool _thread_monitoring_contention_enabled; | |
| 54 static bool _thread_cpu_time_enabled; | |
| 55 | |
| 56 // Need to keep the list of thread dump result that | |
| 57 // keep references to methodOop since thread dump can be | |
| 58 // requested by multiple threads concurrently. | |
| 59 static ThreadDumpResult* _threaddump_list; | |
| 60 | |
| 61 public: | |
| 62 static void init(); | |
| 63 static void add_thread(JavaThread* thread, bool daemon); | |
| 64 static void remove_thread(JavaThread* thread, bool daemon); | |
| 65 static void current_thread_exiting(JavaThread* jt); | |
| 66 | |
| 67 static bool set_thread_monitoring_contention(bool flag); | |
| 68 static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; } | |
| 69 | |
| 70 static bool set_thread_cpu_time_enabled(bool flag); | |
| 71 static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; } | |
| 72 | |
| 73 static jlong get_total_thread_count() { return _total_threads_count->get_value(); } | |
| 74 static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); } | |
| 75 static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; } | |
| 76 static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; } | |
| 77 | |
| 78 static int exiting_threads_count() { return _exiting_threads_count; } | |
| 79 static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; } | |
| 80 | |
| 81 // Support for thread dump | |
| 82 static void add_thread_dump(ThreadDumpResult* dump); | |
| 83 static void remove_thread_dump(ThreadDumpResult* dump); | |
| 84 | |
| 85 static Handle get_current_contended_monitor(JavaThread* thread); | |
| 86 | |
| 87 // This function is called by JVM_DumpThreads. | |
| 88 static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
| 89 int num_threads, TRAPS); | |
| 90 | |
| 91 static void reset_peak_thread_count(); | |
| 92 static void reset_contention_count_stat(JavaThread* thread); | |
| 93 static void reset_contention_time_stat(JavaThread* thread); | |
| 94 | |
| 95 static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only); | |
| 96 | |
| 97 // GC support | |
| 98 static void oops_do(OopClosure* f); | |
| 99 }; | |
| 100 | |
| 101 // Per-thread Statistics for synchronization | |
| 102 class ThreadStatistics : public CHeapObj { | |
| 103 private: | |
| 104 // The following contention statistics are only updated by | |
| 105 // the thread owning these statistics when contention occurs. | |
| 106 | |
| 107 jlong _contended_enter_count; | |
| 108 elapsedTimer _contended_enter_timer; | |
| 109 jlong _monitor_wait_count; | |
| 110 elapsedTimer _monitor_wait_timer; | |
| 111 jlong _sleep_count; | |
| 112 elapsedTimer _sleep_timer; | |
| 113 | |
| 114 | |
| 115 // These two reset flags are set to true when another thread | |
| 116 // requests to reset the statistics. The actual statistics | |
| 117 // are reset when the thread contention occurs and attempts | |
| 118 // to update the statistics. | |
| 119 bool _count_pending_reset; | |
| 120 bool _timer_pending_reset; | |
| 121 | |
| 122 // Keep accurate times for potentially recursive class operations | |
|
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123 int _perf_recursion_counts[6]; |
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124 elapsedTimer _perf_timers[6]; |
| 0 | 125 |
| 126 // utility functions | |
| 127 void check_and_reset_count() { | |
| 128 if (!_count_pending_reset) return; | |
| 129 _contended_enter_count = 0; | |
| 130 _monitor_wait_count = 0; | |
| 131 _sleep_count = 0; | |
| 132 _count_pending_reset = 0; | |
| 133 } | |
| 134 void check_and_reset_timer() { | |
| 135 if (!_timer_pending_reset) return; | |
| 136 _contended_enter_timer.reset(); | |
| 137 _monitor_wait_timer.reset(); | |
| 138 _sleep_timer.reset(); | |
| 139 _timer_pending_reset = 0; | |
| 140 } | |
| 141 | |
| 142 public: | |
| 143 ThreadStatistics(); | |
| 144 | |
| 145 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); } | |
| 146 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); } | |
| 147 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); } | |
| 148 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); } | |
| 149 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); } | |
| 150 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); } | |
| 151 | |
| 152 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; } | |
| 153 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); } | |
| 154 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); } | |
| 155 | |
| 156 void thread_sleep() { check_and_reset_count(); _sleep_count++; } | |
| 157 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); } | |
| 158 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); } | |
| 159 | |
| 160 void contended_enter() { check_and_reset_count(); _contended_enter_count++; } | |
| 161 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); } | |
| 162 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); } | |
| 163 | |
| 164 void reset_count_stat() { _count_pending_reset = true; } | |
| 165 void reset_time_stat() { _timer_pending_reset = true; } | |
| 166 | |
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167 int* perf_recursion_counts_addr() { return _perf_recursion_counts; } |
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168 elapsedTimer* perf_timers_addr() { return _perf_timers; } |
| 0 | 169 }; |
| 170 | |
| 171 // Thread snapshot to represent the thread state and statistics | |
| 172 class ThreadSnapshot : public CHeapObj { | |
| 173 private: | |
| 174 JavaThread* _thread; | |
| 175 oop _threadObj; | |
| 176 java_lang_Thread::ThreadStatus _thread_status; | |
| 177 | |
| 178 bool _is_ext_suspended; | |
| 179 bool _is_in_native; | |
| 180 | |
| 181 jlong _contended_enter_ticks; | |
| 182 jlong _contended_enter_count; | |
| 183 jlong _monitor_wait_ticks; | |
| 184 jlong _monitor_wait_count; | |
| 185 jlong _sleep_ticks; | |
| 186 jlong _sleep_count; | |
| 187 oop _blocker_object; | |
| 188 oop _blocker_object_owner; | |
| 189 | |
| 190 ThreadStackTrace* _stack_trace; | |
| 191 ThreadConcurrentLocks* _concurrent_locks; | |
| 192 ThreadSnapshot* _next; | |
| 193 | |
| 194 public: | |
| 195 // Dummy snapshot | |
| 196 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL), | |
| 197 _blocker_object(NULL), _blocker_object_owner(NULL) {}; | |
| 198 ThreadSnapshot(JavaThread* thread); | |
| 199 ~ThreadSnapshot(); | |
| 200 | |
| 201 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; } | |
| 202 | |
| 203 oop threadObj() const { return _threadObj; } | |
| 204 | |
| 205 void set_next(ThreadSnapshot* n) { _next = n; } | |
| 206 | |
| 207 bool is_ext_suspended() { return _is_ext_suspended; } | |
| 208 bool is_in_native() { return _is_in_native; } | |
| 209 | |
| 210 jlong contended_enter_count() { return _contended_enter_count; } | |
| 211 jlong contended_enter_ticks() { return _contended_enter_ticks; } | |
| 212 jlong monitor_wait_count() { return _monitor_wait_count; } | |
| 213 jlong monitor_wait_ticks() { return _monitor_wait_ticks; } | |
| 214 jlong sleep_count() { return _sleep_count; } | |
| 215 jlong sleep_ticks() { return _sleep_ticks; } | |
| 216 | |
| 217 | |
| 218 oop blocker_object() { return _blocker_object; } | |
| 219 oop blocker_object_owner() { return _blocker_object_owner; } | |
| 220 | |
| 221 ThreadSnapshot* next() const { return _next; } | |
| 222 ThreadStackTrace* get_stack_trace() { return _stack_trace; } | |
| 223 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; } | |
| 224 | |
| 225 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors); | |
| 226 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; } | |
| 227 void oops_do(OopClosure* f); | |
| 228 }; | |
| 229 | |
| 230 class ThreadStackTrace : public CHeapObj { | |
| 231 private: | |
| 232 JavaThread* _thread; | |
| 233 int _depth; // number of stack frames added | |
| 234 bool _with_locked_monitors; | |
| 235 GrowableArray<StackFrameInfo*>* _frames; | |
| 236 GrowableArray<oop>* _jni_locked_monitors; | |
| 237 | |
| 238 public: | |
| 239 | |
| 240 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors); | |
| 241 ~ThreadStackTrace(); | |
| 242 | |
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243 JavaThread* thread() { return _thread; } |
| 0 | 244 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); } |
| 245 int get_stack_depth() { return _depth; } | |
| 246 | |
| 247 void add_stack_frame(javaVFrame* jvf); | |
| 248 void dump_stack_at_safepoint(int max_depth); | |
| 249 Handle allocate_fill_stack_trace_element_array(TRAPS); | |
| 250 void oops_do(OopClosure* f); | |
| 251 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; } | |
| 252 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); } | |
| 253 | |
| 254 bool is_owned_monitor_on_stack(oop object); | |
| 255 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); } | |
| 256 }; | |
| 257 | |
| 258 // StackFrameInfo for keeping methodOop and bci during | |
| 259 // stack walking for later construction of StackTraceElement[] | |
| 260 // Java instances | |
| 261 class StackFrameInfo : public CHeapObj { | |
| 262 private: | |
| 263 methodOop _method; | |
| 264 int _bci; | |
| 265 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame | |
| 266 | |
| 267 public: | |
| 268 | |
| 269 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors); | |
| 270 ~StackFrameInfo() { | |
| 271 if (_locked_monitors != NULL) { | |
| 272 delete _locked_monitors; | |
| 273 } | |
| 274 }; | |
| 275 methodOop method() const { return _method; } | |
| 276 int bci() const { return _bci; } | |
| 277 void oops_do(OopClosure* f); | |
| 278 | |
| 279 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); } | |
| 280 GrowableArray<oop>* locked_monitors() { return _locked_monitors; } | |
| 281 | |
| 282 void print_on(outputStream* st) const; | |
| 283 }; | |
| 284 | |
| 285 class ThreadConcurrentLocks : public CHeapObj { | |
| 286 private: | |
| 287 GrowableArray<instanceOop>* _owned_locks; | |
| 288 ThreadConcurrentLocks* _next; | |
| 289 JavaThread* _thread; | |
| 290 public: | |
| 291 ThreadConcurrentLocks(JavaThread* thread); | |
| 292 ~ThreadConcurrentLocks(); | |
| 293 | |
| 294 void add_lock(instanceOop o); | |
| 295 void set_next(ThreadConcurrentLocks* n) { _next = n; } | |
| 296 ThreadConcurrentLocks* next() { return _next; } | |
| 297 JavaThread* java_thread() { return _thread; } | |
| 298 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; } | |
| 299 void oops_do(OopClosure* f); | |
| 300 }; | |
| 301 | |
| 302 class ConcurrentLocksDump : public StackObj { | |
| 303 private: | |
| 304 ThreadConcurrentLocks* _map; | |
| 305 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map | |
| 306 bool _retain_map_on_free; | |
| 307 | |
| 308 void build_map(GrowableArray<oop>* aos_objects); | |
| 309 void add_lock(JavaThread* thread, instanceOop o); | |
| 310 | |
| 311 public: | |
| 312 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {}; | |
| 313 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {}; | |
| 314 ~ConcurrentLocksDump(); | |
| 315 | |
| 316 void dump_at_safepoint(); | |
| 317 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread); | |
| 318 void print_locks_on(JavaThread* t, outputStream* st); | |
| 319 }; | |
| 320 | |
| 321 class ThreadDumpResult : public StackObj { | |
| 322 private: | |
| 323 int _num_threads; | |
| 324 int _num_snapshots; | |
| 325 ThreadSnapshot* _snapshots; | |
| 326 ThreadSnapshot* _last; | |
| 327 ThreadDumpResult* _next; | |
| 328 public: | |
| 329 ThreadDumpResult(); | |
| 330 ThreadDumpResult(int num_threads); | |
| 331 ~ThreadDumpResult(); | |
| 332 | |
| 333 void add_thread_snapshot(ThreadSnapshot* ts); | |
| 334 void set_next(ThreadDumpResult* next) { _next = next; } | |
| 335 ThreadDumpResult* next() { return _next; } | |
| 336 int num_threads() { return _num_threads; } | |
| 337 int num_snapshots() { return _num_snapshots; } | |
| 338 ThreadSnapshot* snapshots() { return _snapshots; } | |
| 339 void oops_do(OopClosure* f); | |
| 340 }; | |
| 341 | |
| 342 class DeadlockCycle : public CHeapObj { | |
| 343 private: | |
| 344 bool _is_deadlock; | |
| 345 GrowableArray<JavaThread*>* _threads; | |
| 346 DeadlockCycle* _next; | |
| 347 public: | |
| 348 DeadlockCycle(); | |
| 349 ~DeadlockCycle(); | |
| 350 | |
| 351 DeadlockCycle* next() { return _next; } | |
| 352 void set_next(DeadlockCycle* d) { _next = d; } | |
| 353 void add_thread(JavaThread* t) { _threads->append(t); } | |
| 354 void reset() { _is_deadlock = false; _threads->clear(); } | |
| 355 void set_deadlock(bool value) { _is_deadlock = value; } | |
| 356 bool is_deadlock() { return _is_deadlock; } | |
| 357 int num_threads() { return _threads->length(); } | |
| 358 GrowableArray<JavaThread*>* threads() { return _threads; } | |
| 359 void print_on(outputStream* st) const; | |
| 360 }; | |
| 361 | |
| 362 // Utility class to get list of java threads. | |
| 363 class ThreadsListEnumerator : public StackObj { | |
| 364 private: | |
| 365 GrowableArray<instanceHandle>* _threads_array; | |
| 366 public: | |
| 367 ThreadsListEnumerator(Thread* cur_thread, | |
| 368 bool include_jvmti_agent_threads = false, | |
| 369 bool include_jni_attaching_threads = true); | |
| 370 int num_threads() { return _threads_array->length(); } | |
| 371 instanceHandle get_threadObj(int index) { return _threads_array->at(index); } | |
| 372 }; | |
| 373 | |
| 374 | |
| 375 // abstract utility class to set new thread states, and restore previous after the block exits | |
| 376 class JavaThreadStatusChanger : public StackObj { | |
| 377 private: | |
| 378 java_lang_Thread::ThreadStatus _old_state; | |
| 379 JavaThread* _java_thread; | |
| 380 bool _is_alive; | |
| 381 | |
| 382 void save_old_state(JavaThread* java_thread) { | |
| 383 _java_thread = java_thread; | |
| 384 _is_alive = is_alive(java_thread); | |
| 385 if (is_alive()) { | |
| 386 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj()); | |
| 387 } | |
| 388 } | |
| 389 | |
| 390 public: | |
| 391 static void set_thread_status(JavaThread* java_thread, | |
| 392 java_lang_Thread::ThreadStatus state) { | |
| 393 java_lang_Thread::set_thread_status(java_thread->threadObj(), state); | |
| 394 } | |
| 395 | |
| 396 void set_thread_status(java_lang_Thread::ThreadStatus state) { | |
| 397 if (is_alive()) { | |
| 398 set_thread_status(_java_thread, state); | |
| 399 } | |
| 400 } | |
| 401 | |
| 402 JavaThreadStatusChanger(JavaThread* java_thread, | |
| 403 java_lang_Thread::ThreadStatus state) { | |
| 404 save_old_state(java_thread); | |
| 405 set_thread_status(state); | |
| 406 } | |
| 407 | |
| 408 JavaThreadStatusChanger(JavaThread* java_thread) { | |
| 409 save_old_state(java_thread); | |
| 410 } | |
| 411 | |
| 412 ~JavaThreadStatusChanger() { | |
| 413 set_thread_status(_old_state); | |
| 414 } | |
| 415 | |
| 416 static bool is_alive(JavaThread* java_thread) { | |
| 417 return java_thread != NULL && java_thread->threadObj() != NULL; | |
| 418 } | |
| 419 | |
| 420 bool is_alive() { | |
| 421 return _is_alive; | |
| 422 } | |
| 423 }; | |
| 424 | |
| 425 // Change status to waiting on an object (timed or indefinite) | |
| 426 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger { | |
| 427 private: | |
| 428 ThreadStatistics* _stat; | |
| 429 bool _active; | |
| 430 | |
| 431 public: | |
| 432 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) : | |
| 433 JavaThreadStatusChanger(java_thread, | |
| 434 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) { | |
| 435 if (is_alive()) { | |
| 436 _stat = java_thread->get_thread_stat(); | |
| 437 _active = ThreadService::is_thread_monitoring_contention(); | |
| 438 _stat->monitor_wait(); | |
| 439 if (_active) { | |
| 440 _stat->monitor_wait_begin(); | |
| 441 } | |
| 442 } else { | |
| 443 _active = false; | |
| 444 } | |
| 445 } | |
| 446 | |
| 447 ~JavaThreadInObjectWaitState() { | |
| 448 if (_active) { | |
| 449 _stat->monitor_wait_end(); | |
| 450 } | |
| 451 } | |
| 452 }; | |
| 453 | |
| 454 // Change status to parked (timed or indefinite) | |
| 455 class JavaThreadParkedState : public JavaThreadStatusChanger { | |
| 456 private: | |
| 457 ThreadStatistics* _stat; | |
| 458 bool _active; | |
| 459 | |
| 460 public: | |
| 461 JavaThreadParkedState(JavaThread *java_thread, bool timed) : | |
| 462 JavaThreadStatusChanger(java_thread, | |
| 463 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) { | |
| 464 if (is_alive()) { | |
| 465 _stat = java_thread->get_thread_stat(); | |
| 466 _active = ThreadService::is_thread_monitoring_contention(); | |
| 467 _stat->monitor_wait(); | |
| 468 if (_active) { | |
| 469 _stat->monitor_wait_begin(); | |
| 470 } | |
| 471 } else { | |
| 472 _active = false; | |
| 473 } | |
| 474 } | |
| 475 | |
| 476 ~JavaThreadParkedState() { | |
| 477 if (_active) { | |
| 478 _stat->monitor_wait_end(); | |
| 479 } | |
| 480 } | |
| 481 }; | |
| 482 | |
| 483 // Change status to blocked on (re-)entering a synchronization block | |
| 484 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger { | |
| 485 private: | |
| 486 ThreadStatistics* _stat; | |
| 487 bool _active; | |
| 488 | |
| 489 static bool contended_enter_begin(JavaThread *java_thread) { | |
| 490 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); | |
| 491 ThreadStatistics* stat = java_thread->get_thread_stat(); | |
| 492 stat->contended_enter(); | |
| 493 bool active = ThreadService::is_thread_monitoring_contention(); | |
| 494 if (active) { | |
| 495 stat->contended_enter_begin(); | |
| 496 } | |
| 497 return active; | |
| 498 } | |
| 499 | |
| 500 public: | |
| 501 // java_thread is waiting thread being blocked on monitor reenter. | |
| 502 // Current thread is the notifying thread which holds the monitor. | |
| 503 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) { | |
| 504 assert((java_thread != NULL), "Java thread should not be null here"); | |
| 505 bool active = false; | |
| 506 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) { | |
| 507 active = contended_enter_begin(java_thread); | |
| 508 } | |
| 509 return active; | |
| 510 } | |
| 511 | |
| 512 static void wait_reenter_end(JavaThread *java_thread, bool active) { | |
| 513 if (active) { | |
| 514 java_thread->get_thread_stat()->contended_enter_end(); | |
| 515 } | |
| 516 set_thread_status(java_thread, java_lang_Thread::RUNNABLE); | |
| 517 } | |
| 518 | |
| 519 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) : | |
| 520 JavaThreadStatusChanger(java_thread) { | |
| 521 assert((java_thread != NULL), "Java thread should not be null here"); | |
| 522 // Change thread status and collect contended enter stats for monitor contended | |
| 523 // enter done for external java world objects and it is contended. All other cases | |
| 524 // like for vm internal objects and for external objects which are not contended | |
| 525 // thread status is not changed and contended enter stat is not collected. | |
| 526 _active = false; | |
| 527 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) { | |
| 528 _stat = java_thread->get_thread_stat(); | |
| 529 _active = contended_enter_begin(java_thread); | |
| 530 } | |
| 531 } | |
| 532 | |
| 533 ~JavaThreadBlockedOnMonitorEnterState() { | |
| 534 if (_active) { | |
| 535 _stat->contended_enter_end(); | |
| 536 } | |
| 537 } | |
| 538 }; | |
| 539 | |
| 540 // Change status to sleeping | |
| 541 class JavaThreadSleepState : public JavaThreadStatusChanger { | |
| 542 private: | |
| 543 ThreadStatistics* _stat; | |
| 544 bool _active; | |
| 545 public: | |
| 546 JavaThreadSleepState(JavaThread *java_thread) : | |
| 547 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) { | |
| 548 if (is_alive()) { | |
| 549 _stat = java_thread->get_thread_stat(); | |
| 550 _active = ThreadService::is_thread_monitoring_contention(); | |
| 551 _stat->thread_sleep(); | |
| 552 if (_active) { | |
| 553 _stat->thread_sleep_begin(); | |
| 554 } | |
| 555 } else { | |
| 556 _active = false; | |
| 557 } | |
| 558 } | |
| 559 | |
| 560 ~JavaThreadSleepState() { | |
| 561 if (_active) { | |
| 562 _stat->thread_sleep_end(); | |
| 563 } | |
| 564 } | |
| 565 }; |