Mercurial > hg > truffle
annotate src/share/vm/services/threadService.cpp @ 2004:4da76e32c0be
7002666: eclipse CDT projects crash with compressed oops
Reviewed-by: kvn, twisti
author | never |
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date | Wed, 01 Dec 2010 10:16:31 -0800 |
parents | f95d63e2154a |
children | b1a2afa37ec4 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, 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 * | |
1552
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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; | |
49 | |
50 PerfCounter* ThreadService::_total_threads_count = NULL; | |
51 PerfVariable* ThreadService::_live_threads_count = NULL; | |
52 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
53 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
54 volatile int ThreadService::_exiting_threads_count = 0; | |
55 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
56 | |
57 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
58 | |
59 static const int INITIAL_ARRAY_SIZE = 10; | |
60 | |
61 void ThreadService::init() { | |
62 EXCEPTION_MARK; | |
63 | |
64 // These counters are for java.lang.management API support. | |
65 // They are created even if -XX:-UsePerfData is set and in | |
66 // that case, they will be allocated on C heap. | |
67 | |
68 _total_threads_count = | |
69 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
70 PerfData::U_Events, CHECK); | |
71 | |
72 _live_threads_count = | |
73 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
74 PerfData::U_None, CHECK); | |
75 | |
76 _peak_threads_count = | |
77 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
78 PerfData::U_None, CHECK); | |
79 | |
80 _daemon_threads_count = | |
81 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
82 PerfData::U_None, CHECK); | |
83 | |
84 if (os::is_thread_cpu_time_supported()) { | |
85 _thread_cpu_time_enabled = true; | |
86 } | |
87 } | |
88 | |
89 void ThreadService::reset_peak_thread_count() { | |
90 // Acquire the lock to update the peak thread count | |
91 // to synchronize with thread addition and removal. | |
92 MutexLockerEx mu(Threads_lock); | |
93 _peak_threads_count->set_value(get_live_thread_count()); | |
94 } | |
95 | |
96 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
97 // Do not count VM internal or JVMTI agent threads | |
98 if (thread->is_hidden_from_external_view() || | |
99 thread->is_jvmti_agent_thread()) { | |
100 return; | |
101 } | |
102 | |
103 _total_threads_count->inc(); | |
104 _live_threads_count->inc(); | |
105 | |
106 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
107 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
108 } | |
109 | |
110 if (daemon) { | |
111 _daemon_threads_count->inc(); | |
112 } | |
113 } | |
114 | |
115 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
116 Atomic::dec((jint*) &_exiting_threads_count); | |
117 | |
118 if (thread->is_hidden_from_external_view() || | |
119 thread->is_jvmti_agent_thread()) { | |
120 return; | |
121 } | |
122 | |
123 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
124 | |
125 if (daemon) { | |
126 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
127 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
128 } | |
129 } | |
130 | |
131 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
132 assert(jt == JavaThread::current(), "Called by current thread"); | |
133 Atomic::inc((jint*) &_exiting_threads_count); | |
134 | |
135 oop threadObj = jt->threadObj(); | |
136 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
137 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
138 } | |
139 } | |
140 | |
141 // FIXME: JVMTI should call this function | |
142 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
143 assert(thread != NULL, "should be non-NULL"); | |
144 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
145 | |
146 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
147 | |
148 oop obj = NULL; | |
149 if (wait_obj != NULL) { | |
150 // thread is doing an Object.wait() call | |
151 obj = (oop) wait_obj->object(); | |
152 assert(obj != NULL, "Object.wait() should have an object"); | |
153 } else { | |
154 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
155 if (enter_obj != NULL) { | |
156 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
157 obj = (oop) enter_obj->object(); | |
158 } | |
159 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
160 } | |
161 | |
162 Handle h(obj); | |
163 return h; | |
164 } | |
165 | |
166 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
167 MutexLocker m(Management_lock); | |
168 | |
169 bool prev = _thread_monitoring_contention_enabled; | |
170 _thread_monitoring_contention_enabled = flag; | |
171 | |
172 return prev; | |
173 } | |
174 | |
175 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
176 MutexLocker m(Management_lock); | |
177 | |
178 bool prev = _thread_cpu_time_enabled; | |
179 _thread_cpu_time_enabled = flag; | |
180 | |
181 return prev; | |
182 } | |
183 | |
184 // GC support | |
185 void ThreadService::oops_do(OopClosure* f) { | |
186 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
187 dump->oops_do(f); | |
188 } | |
189 } | |
190 | |
191 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { | |
192 MutexLocker ml(Management_lock); | |
193 if (_threaddump_list == NULL) { | |
194 _threaddump_list = dump; | |
195 } else { | |
196 dump->set_next(_threaddump_list); | |
197 _threaddump_list = dump; | |
198 } | |
199 } | |
200 | |
201 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
202 MutexLocker ml(Management_lock); | |
203 | |
204 ThreadDumpResult* prev = NULL; | |
205 bool found = false; | |
206 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
207 if (d == dump) { | |
208 if (prev == NULL) { | |
209 _threaddump_list = dump->next(); | |
210 } else { | |
211 prev->set_next(dump->next()); | |
212 } | |
213 found = true; | |
214 break; | |
215 } | |
216 } | |
217 assert(found, "The threaddump result to be removed must exist."); | |
218 } | |
219 | |
220 // Dump stack trace of threads specified in the given threads array. | |
221 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
222 // the corresponding entry in the given threads array | |
223 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
224 int num_threads, | |
225 TRAPS) { | |
226 assert(num_threads > 0, "just checking"); | |
227 | |
228 ThreadDumpResult dump_result; | |
229 VM_ThreadDump op(&dump_result, | |
230 threads, | |
231 num_threads, | |
232 -1, /* entire stack */ | |
233 false, /* with locked monitors */ | |
234 false /* with locked synchronizers */); | |
235 VMThread::execute(&op); | |
236 | |
237 // Allocate the resulting StackTraceElement[][] object | |
238 | |
239 ResourceMark rm(THREAD); | |
240 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_StackTraceElement_array(), true, CHECK_NH); | |
241 objArrayKlassHandle ik (THREAD, k); | |
242 objArrayOop r = oopFactory::new_objArray(ik(), num_threads, CHECK_NH); | |
243 objArrayHandle result_obj(THREAD, r); | |
244 | |
245 int num_snapshots = dump_result.num_snapshots(); | |
246 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
247 int i = 0; | |
248 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
249 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
250 if (stacktrace == NULL) { | |
251 // No stack trace | |
252 result_obj->obj_at_put(i, NULL); | |
253 } else { | |
254 // Construct an array of java/lang/StackTraceElement object | |
255 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
256 result_obj->obj_at_put(i, backtrace_h()); | |
257 } | |
258 } | |
259 | |
260 return result_obj; | |
261 } | |
262 | |
263 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
264 ThreadStatistics* stat = thread->get_thread_stat(); | |
265 if (stat != NULL) { | |
266 stat->reset_count_stat(); | |
267 } | |
268 } | |
269 | |
270 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
271 ThreadStatistics* stat = thread->get_thread_stat(); | |
272 if (stat != NULL) { | |
273 stat->reset_time_stat(); | |
274 } | |
275 } | |
276 | |
277 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
278 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
279 // This code was modified from the original Threads::find_deadlocks code. | |
280 int globalDfn = 0, thisDfn; | |
281 ObjectMonitor* waitingToLockMonitor = NULL; | |
282 oop waitingToLockBlocker = NULL; | |
283 bool blocked_on_monitor = false; | |
284 JavaThread *currentThread, *previousThread; | |
285 int num_deadlocks = 0; | |
286 | |
287 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
288 // Initialize the depth-first-number | |
289 p->set_depth_first_number(-1); | |
290 } | |
291 | |
292 DeadlockCycle* deadlocks = NULL; | |
293 DeadlockCycle* last = NULL; | |
294 DeadlockCycle* cycle = new DeadlockCycle(); | |
295 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
296 if (jt->depth_first_number() >= 0) { | |
297 // this thread was already visited | |
298 continue; | |
299 } | |
300 | |
301 thisDfn = globalDfn; | |
302 jt->set_depth_first_number(globalDfn++); | |
303 previousThread = jt; | |
304 currentThread = jt; | |
305 | |
306 cycle->reset(); | |
307 | |
308 // When there is a deadlock, all the monitors involved in the dependency | |
309 // cycle must be contended and heavyweight. So we only care about the | |
310 // heavyweight monitor a thread is waiting to lock. | |
311 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
312 if (concurrent_locks) { | |
313 waitingToLockBlocker = jt->current_park_blocker(); | |
314 } | |
315 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
316 cycle->add_thread(currentThread); | |
317 if (waitingToLockMonitor != NULL) { | |
318 currentThread = Threads::owning_thread_from_monitor_owner((address)waitingToLockMonitor->owner(), | |
319 false /* no locking needed */); | |
320 } else { | |
321 if (concurrent_locks) { | |
322 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
323 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
324 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
325 } else { | |
326 currentThread = NULL; | |
327 } | |
328 } | |
329 } | |
330 | |
331 if (currentThread == NULL) { | |
332 // No dependency on another thread | |
333 break; | |
334 } | |
335 if (currentThread->depth_first_number() < 0) { | |
336 // First visit to this thread | |
337 currentThread->set_depth_first_number(globalDfn++); | |
338 } else if (currentThread->depth_first_number() < thisDfn) { | |
339 // Thread already visited, and not on a (new) cycle | |
340 break; | |
341 } else if (currentThread == previousThread) { | |
342 // Self-loop, ignore | |
343 break; | |
344 } else { | |
345 // We have a (new) cycle | |
346 num_deadlocks++; | |
347 | |
348 cycle->set_deadlock(true); | |
349 | |
350 // add this cycle to the deadlocks list | |
351 if (deadlocks == NULL) { | |
352 deadlocks = cycle; | |
353 } else { | |
354 last->set_next(cycle); | |
355 } | |
356 last = cycle; | |
357 cycle = new DeadlockCycle(); | |
358 break; | |
359 } | |
360 previousThread = currentThread; | |
361 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
362 if (concurrent_locks) { | |
363 waitingToLockBlocker = currentThread->current_park_blocker(); | |
364 } | |
365 } | |
366 | |
367 } | |
368 | |
369 return deadlocks; | |
370 } | |
371 | |
372 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
373 | |
374 // Create a new ThreadDumpResult object and append to the list. | |
375 // If GC happens before this function returns, methodOop | |
376 // in the stack trace will be visited. | |
377 ThreadService::add_thread_dump(this); | |
378 } | |
379 | |
380 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
381 // Create a new ThreadDumpResult object and append to the list. | |
382 // If GC happens before this function returns, oops | |
383 // will be visited. | |
384 ThreadService::add_thread_dump(this); | |
385 } | |
386 | |
387 ThreadDumpResult::~ThreadDumpResult() { | |
388 ThreadService::remove_thread_dump(this); | |
389 | |
390 // free all the ThreadSnapshot objects created during | |
391 // the VM_ThreadDump operation | |
392 ThreadSnapshot* ts = _snapshots; | |
393 while (ts != NULL) { | |
394 ThreadSnapshot* p = ts; | |
395 ts = ts->next(); | |
396 delete p; | |
397 } | |
398 } | |
399 | |
400 | |
401 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
402 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
403 "_num_snapshots must be less than _num_threads"); | |
404 _num_snapshots++; | |
405 if (_snapshots == NULL) { | |
406 _snapshots = ts; | |
407 } else { | |
408 _last->set_next(ts); | |
409 } | |
410 _last = ts; | |
411 } | |
412 | |
413 void ThreadDumpResult::oops_do(OopClosure* f) { | |
414 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
415 ts->oops_do(f); | |
416 } | |
417 } | |
418 | |
419 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { | |
420 _method = jvf->method(); | |
421 _bci = jvf->bci(); | |
422 _locked_monitors = NULL; | |
423 if (with_lock_info) { | |
424 ResourceMark rm; | |
425 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
426 int length = list->length(); | |
427 if (length > 0) { | |
428 _locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(length, true); | |
429 for (int i = 0; i < length; i++) { | |
430 MonitorInfo* monitor = list->at(i); | |
431 assert(monitor->owner(), "This monitor must have an owning object"); | |
432 _locked_monitors->append(monitor->owner()); | |
433 } | |
434 } | |
435 } | |
436 } | |
437 | |
438 void StackFrameInfo::oops_do(OopClosure* f) { | |
439 f->do_oop((oop*) &_method); | |
440 if (_locked_monitors != NULL) { | |
441 int length = _locked_monitors->length(); | |
442 for (int i = 0; i < length; i++) { | |
443 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
444 } | |
445 } | |
446 } | |
447 | |
448 void StackFrameInfo::print_on(outputStream* st) const { | |
449 ResourceMark rm; | |
450 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
451 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
452 for (int i = 0; i < len; i++) { | |
453 oop o = _locked_monitors->at(i); | |
454 instanceKlass* ik = instanceKlass::cast(o->klass()); | |
455 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); | |
456 } | |
457 | |
458 } | |
459 | |
460 // Iterate through monitor cache to find JNI locked monitors | |
461 class InflatedMonitorsClosure: public MonitorClosure { | |
462 private: | |
463 ThreadStackTrace* _stack_trace; | |
464 Thread* _thread; | |
465 public: | |
466 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
467 _thread = t; | |
468 _stack_trace = st; | |
469 } | |
470 void do_monitor(ObjectMonitor* mid) { | |
471 if (mid->owner() == _thread) { | |
472 oop object = (oop) mid->object(); | |
473 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
474 _stack_trace->add_jni_locked_monitor(object); | |
475 } | |
476 } | |
477 } | |
478 }; | |
479 | |
480 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
481 _thread = t; | |
482 _frames = new (ResourceObj::C_HEAP) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); | |
483 _depth = 0; | |
484 _with_locked_monitors = with_locked_monitors; | |
485 if (_with_locked_monitors) { | |
486 _jni_locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); | |
487 } else { | |
488 _jni_locked_monitors = NULL; | |
489 } | |
490 } | |
491 | |
492 ThreadStackTrace::~ThreadStackTrace() { | |
493 for (int i = 0; i < _frames->length(); i++) { | |
494 delete _frames->at(i); | |
495 } | |
496 delete _frames; | |
497 if (_jni_locked_monitors != NULL) { | |
498 delete _jni_locked_monitors; | |
499 } | |
500 } | |
501 | |
502 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
503 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
504 | |
505 if (_thread->has_last_Java_frame()) { | |
506 RegisterMap reg_map(_thread); | |
507 vframe* start_vf = _thread->last_java_vframe(®_map); | |
508 int count = 0; | |
509 for (vframe* f = start_vf; f; f = f->sender() ) { | |
510 if (f->is_java_frame()) { | |
511 javaVFrame* jvf = javaVFrame::cast(f); | |
512 add_stack_frame(jvf); | |
513 count++; | |
514 } else { | |
515 // Ignore non-Java frames | |
516 } | |
517 if (maxDepth > 0 && count == maxDepth) { | |
518 // Skip frames if more than maxDepth | |
519 break; | |
520 } | |
521 } | |
522 } | |
523 | |
524 if (_with_locked_monitors) { | |
525 // Iterate inflated monitors and find monitors locked by this thread | |
526 // not found in the stack | |
527 InflatedMonitorsClosure imc(_thread, this); | |
528 ObjectSynchronizer::monitors_iterate(&imc); | |
529 } | |
530 } | |
531 | |
532 | |
533 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
534 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
535 | |
536 bool found = false; | |
537 int num_frames = get_stack_depth(); | |
538 for (int depth = 0; depth < num_frames; depth++) { | |
539 StackFrameInfo* frame = stack_frame_at(depth); | |
540 int len = frame->num_locked_monitors(); | |
541 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
542 for (int j = 0; j < len; j++) { | |
543 oop monitor = locked_monitors->at(j); | |
544 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
545 if (monitor == object) { | |
546 found = true; | |
547 break; | |
548 } | |
549 } | |
550 } | |
551 return found; | |
552 } | |
553 | |
554 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
1142 | 555 klassOop k = SystemDictionary::StackTraceElement_klass(); |
132
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556 assert(k != NULL, "must be loaded in 1.4+"); |
0 | 557 instanceKlassHandle ik(THREAD, k); |
558 | |
559 // Allocate an array of java/lang/StackTraceElement object | |
560 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
561 objArrayHandle backtrace(THREAD, ste); | |
562 for (int j = 0; j < _depth; j++) { | |
563 StackFrameInfo* frame = _frames->at(j); | |
564 methodHandle mh(THREAD, frame->method()); | |
565 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
566 backtrace->obj_at_put(j, element); | |
567 } | |
568 return backtrace; | |
569 } | |
570 | |
571 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
572 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
573 _frames->append(frame); | |
574 _depth++; | |
575 } | |
576 | |
577 void ThreadStackTrace::oops_do(OopClosure* f) { | |
578 int length = _frames->length(); | |
579 for (int i = 0; i < length; i++) { | |
580 _frames->at(i)->oops_do(f); | |
581 } | |
582 | |
583 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
584 for (int j = 0; j < length; j++) { | |
585 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
586 } | |
587 } | |
588 | |
589 ConcurrentLocksDump::~ConcurrentLocksDump() { | |
590 if (_retain_map_on_free) { | |
591 return; | |
592 } | |
593 | |
594 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
595 ThreadConcurrentLocks* tcl = t; | |
596 t = t->next(); | |
597 delete tcl; | |
598 } | |
599 } | |
600 | |
601 void ConcurrentLocksDump::dump_at_safepoint() { | |
602 // dump all locked concurrent locks | |
603 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
604 | |
605 if (JDK_Version::is_gte_jdk16x_version()) { | |
606 ResourceMark rm; | |
607 | |
608 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
609 | |
610 // Find all instances of AbstractOwnableSynchronizer | |
611 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
612 aos_objects); | |
613 // Build a map of thread to its owned AQS locks | |
614 build_map(aos_objects); | |
615 } | |
616 } | |
617 | |
618 | |
619 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
620 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
621 int length = aos_objects->length(); | |
622 for (int i = 0; i < length; i++) { | |
623 oop o = aos_objects->at(i); | |
624 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
625 if (owner_thread_obj != NULL) { | |
626 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
627 assert(o->is_instance(), "Must be an instanceOop"); | |
628 add_lock(thread, (instanceOop) o); | |
629 } | |
630 } | |
631 } | |
632 | |
633 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
634 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
635 if (tcl != NULL) { | |
636 tcl->add_lock(o); | |
637 return; | |
638 } | |
639 | |
640 // First owned lock found for this thread | |
641 tcl = new ThreadConcurrentLocks(thread); | |
642 tcl->add_lock(o); | |
643 if (_map == NULL) { | |
644 _map = tcl; | |
645 } else { | |
646 _last->set_next(tcl); | |
647 } | |
648 _last = tcl; | |
649 } | |
650 | |
651 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
652 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
653 if (tcl->java_thread() == thread) { | |
654 return tcl; | |
655 } | |
656 } | |
657 return NULL; | |
658 } | |
659 | |
660 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
661 st->print_cr(" Locked ownable synchronizers:"); | |
662 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
663 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
664 if (locks == NULL || locks->is_empty()) { | |
665 st->print_cr("\t- None"); | |
666 st->cr(); | |
667 return; | |
668 } | |
669 | |
670 for (int i = 0; i < locks->length(); i++) { | |
671 instanceOop obj = locks->at(i); | |
672 instanceKlass* ik = instanceKlass::cast(obj->klass()); | |
673 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); | |
674 } | |
675 st->cr(); | |
676 } | |
677 | |
678 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
679 _thread = thread; | |
680 _owned_locks = new (ResourceObj::C_HEAP) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); | |
681 _next = NULL; | |
682 } | |
683 | |
684 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
685 delete _owned_locks; | |
686 } | |
687 | |
688 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
689 _owned_locks->append(o); | |
690 } | |
691 | |
692 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
693 int length = _owned_locks->length(); | |
694 for (int i = 0; i < length; i++) { | |
695 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
696 } | |
697 } | |
698 | |
699 ThreadStatistics::ThreadStatistics() { | |
700 _contended_enter_count = 0; | |
701 _monitor_wait_count = 0; | |
702 _sleep_count = 0; | |
703 _count_pending_reset = false; | |
704 _timer_pending_reset = false; | |
875
6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
mchung
parents:
242
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changeset
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705 memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts)); |
0 | 706 } |
707 | |
708 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
709 _thread = thread; | |
710 _threadObj = thread->threadObj(); | |
711 _stack_trace = NULL; | |
712 _concurrent_locks = NULL; | |
713 _next = NULL; | |
714 | |
715 ThreadStatistics* stat = thread->get_thread_stat(); | |
716 _contended_enter_ticks = stat->contended_enter_ticks(); | |
717 _contended_enter_count = stat->contended_enter_count(); | |
718 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
719 _monitor_wait_count = stat->monitor_wait_count(); | |
720 _sleep_ticks = stat->sleep_ticks(); | |
721 _sleep_count = stat->sleep_count(); | |
722 | |
723 _blocker_object = NULL; | |
724 _blocker_object_owner = NULL; | |
725 | |
726 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
727 _is_ext_suspended = thread->is_being_ext_suspended(); | |
728 _is_in_native = (thread->thread_state() == _thread_in_native); | |
729 | |
730 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
731 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
732 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
733 | |
734 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
735 if (obj() == NULL) { | |
736 // monitor no longer exists; thread is not blocked | |
737 _thread_status = java_lang_Thread::RUNNABLE; | |
738 } else { | |
739 _blocker_object = obj(); | |
740 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
741 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
742 || (owner != NULL && owner->is_attaching())) { | |
743 // ownership information of the monitor is not available | |
744 // (may no longer be owned or releasing to some other thread) | |
745 // make this thread in RUNNABLE state. | |
746 // And when the owner thread is in attaching state, the java thread | |
747 // is not completely initialized. For example thread name and id | |
748 // and may not be set, so hide the attaching thread. | |
749 _thread_status = java_lang_Thread::RUNNABLE; | |
750 _blocker_object = NULL; | |
751 } else if (owner != NULL) { | |
752 _blocker_object_owner = owner->threadObj(); | |
753 } | |
754 } | |
755 } | |
756 | |
757 // Support for JSR-166 locks | |
242 | 758 if (JDK_Version::current().supports_thread_park_blocker() && |
0 | 759 (_thread_status == java_lang_Thread::PARKED || |
760 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
761 | |
762 _blocker_object = thread->current_park_blocker(); | |
763 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
764 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
765 } | |
766 } | |
767 } | |
768 | |
769 ThreadSnapshot::~ThreadSnapshot() { | |
770 delete _stack_trace; | |
771 delete _concurrent_locks; | |
772 } | |
773 | |
774 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
775 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
776 _stack_trace->dump_stack_at_safepoint(max_depth); | |
777 } | |
778 | |
779 | |
780 void ThreadSnapshot::oops_do(OopClosure* f) { | |
781 f->do_oop(&_threadObj); | |
782 f->do_oop(&_blocker_object); | |
783 f->do_oop(&_blocker_object_owner); | |
784 if (_stack_trace != NULL) { | |
785 _stack_trace->oops_do(f); | |
786 } | |
787 if (_concurrent_locks != NULL) { | |
788 _concurrent_locks->oops_do(f); | |
789 } | |
790 } | |
791 | |
792 DeadlockCycle::DeadlockCycle() { | |
793 _is_deadlock = false; | |
794 _threads = new (ResourceObj::C_HEAP) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); | |
795 _next = NULL; | |
796 } | |
797 | |
798 DeadlockCycle::~DeadlockCycle() { | |
799 delete _threads; | |
800 } | |
801 | |
802 void DeadlockCycle::print_on(outputStream* st) const { | |
803 st->cr(); | |
804 st->print_cr("Found one Java-level deadlock:"); | |
805 st->print("============================="); | |
806 | |
807 JavaThread* currentThread; | |
808 ObjectMonitor* waitingToLockMonitor; | |
809 oop waitingToLockBlocker; | |
810 int len = _threads->length(); | |
811 for (int i = 0; i < len; i++) { | |
812 currentThread = _threads->at(i); | |
813 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
814 waitingToLockBlocker = currentThread->current_park_blocker(); | |
815 st->cr(); | |
816 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
817 const char* owner_desc = ",\n which is held by"; | |
818 if (waitingToLockMonitor != NULL) { | |
819 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
820 oop obj = (oop)waitingToLockMonitor->object(); | |
821 if (obj != NULL) { | |
822 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
823 (instanceKlass::cast(obj->klass()))->external_name()); | |
824 | |
825 if (!currentThread->current_pending_monitor_is_from_java()) { | |
826 owner_desc = "\n in JNI, which is held by"; | |
827 } | |
828 } else { | |
829 // No Java object associated - a JVMTI raw monitor | |
830 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
831 } | |
832 currentThread = Threads::owning_thread_from_monitor_owner( | |
833 (address)waitingToLockMonitor->owner(), false /* no locking needed */); | |
834 } else { | |
835 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
836 (address)waitingToLockBlocker, | |
837 (instanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); | |
838 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), | |
839 "Must be an AbstractOwnableSynchronizer"); | |
840 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
841 currentThread = java_lang_Thread::thread(ownerObj); | |
842 } | |
843 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
844 } | |
845 | |
846 st->cr(); | |
847 st->cr(); | |
848 | |
849 // Print stack traces | |
850 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
851 JavaMonitorsInStackTrace = true; | |
852 st->print_cr("Java stack information for the threads listed above:"); | |
853 st->print_cr("==================================================="); | |
854 for (int j = 0; j < len; j++) { | |
855 currentThread = _threads->at(j); | |
856 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
857 currentThread->print_stack_on(st); | |
858 } | |
859 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
860 } | |
861 | |
862 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
863 bool include_jvmti_agent_threads, | |
864 bool include_jni_attaching_threads) { | |
865 assert(cur_thread == Thread::current(), "Check current thread"); | |
866 | |
867 int init_size = ThreadService::get_live_thread_count(); | |
868 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
869 | |
870 MutexLockerEx ml(Threads_lock); | |
871 | |
872 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
873 // skips JavaThreads in the process of exiting | |
874 // and also skips VM internal JavaThreads | |
875 // Threads in _thread_new or _thread_new_trans state are included. | |
876 // i.e. threads have been started but not yet running. | |
877 if (jt->threadObj() == NULL || | |
878 jt->is_exiting() || | |
879 !java_lang_Thread::is_alive(jt->threadObj()) || | |
880 jt->is_hidden_from_external_view()) { | |
881 continue; | |
882 } | |
883 | |
884 // skip agent threads | |
885 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
886 continue; | |
887 } | |
888 | |
889 // skip jni threads in the process of attaching | |
890 if (!include_jni_attaching_threads && jt->is_attaching()) { | |
891 continue; | |
892 } | |
893 | |
894 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
895 _threads_array->append(h); | |
896 } | |
897 } |