Mercurial > hg > truffle
annotate src/share/vm/services/threadService.cpp @ 11722:ff05c78a7f64
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author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | ef748153ee8f |
children | 0b9ea9a72436 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "memory/allocation.hpp" | |
28 #include "memory/heapInspection.hpp" | |
29 #include "memory/oopFactory.hpp" | |
30 #include "oops/instanceKlass.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/handles.inline.hpp" | |
33 #include "runtime/init.hpp" | |
34 #include "runtime/thread.hpp" | |
35 #include "runtime/vframe.hpp" | |
36 #include "runtime/vmThread.hpp" | |
37 #include "runtime/vm_operations.hpp" | |
38 #include "services/threadService.hpp" | |
0 | 39 |
40 // TODO: we need to define a naming convention for perf counters | |
41 // to distinguish counters for: | |
42 // - standard JSR174 use | |
43 // - Hotspot extension (public and committed) | |
44 // - Hotspot extension (private/internal and uncommitted) | |
45 | |
46 // Default is disabled. | |
47 bool ThreadService::_thread_monitoring_contention_enabled = false; | |
48 bool ThreadService::_thread_cpu_time_enabled = false; | |
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49 bool ThreadService::_thread_allocated_memory_enabled = false; |
0 | 50 |
51 PerfCounter* ThreadService::_total_threads_count = NULL; | |
52 PerfVariable* ThreadService::_live_threads_count = NULL; | |
53 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
54 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
55 volatile int ThreadService::_exiting_threads_count = 0; | |
56 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
57 | |
58 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
59 | |
60 static const int INITIAL_ARRAY_SIZE = 10; | |
61 | |
62 void ThreadService::init() { | |
63 EXCEPTION_MARK; | |
64 | |
65 // These counters are for java.lang.management API support. | |
66 // They are created even if -XX:-UsePerfData is set and in | |
67 // that case, they will be allocated on C heap. | |
68 | |
69 _total_threads_count = | |
70 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
71 PerfData::U_Events, CHECK); | |
72 | |
73 _live_threads_count = | |
74 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
75 PerfData::U_None, CHECK); | |
76 | |
77 _peak_threads_count = | |
78 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
79 PerfData::U_None, CHECK); | |
80 | |
81 _daemon_threads_count = | |
82 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
83 PerfData::U_None, CHECK); | |
84 | |
85 if (os::is_thread_cpu_time_supported()) { | |
86 _thread_cpu_time_enabled = true; | |
87 } | |
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88 |
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89 _thread_allocated_memory_enabled = true; // Always on, so enable it |
0 | 90 } |
91 | |
92 void ThreadService::reset_peak_thread_count() { | |
93 // Acquire the lock to update the peak thread count | |
94 // to synchronize with thread addition and removal. | |
95 MutexLockerEx mu(Threads_lock); | |
96 _peak_threads_count->set_value(get_live_thread_count()); | |
97 } | |
98 | |
99 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
100 // Do not count VM internal or JVMTI agent threads | |
101 if (thread->is_hidden_from_external_view() || | |
102 thread->is_jvmti_agent_thread()) { | |
103 return; | |
104 } | |
105 | |
106 _total_threads_count->inc(); | |
107 _live_threads_count->inc(); | |
108 | |
109 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
110 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
111 } | |
112 | |
113 if (daemon) { | |
114 _daemon_threads_count->inc(); | |
115 } | |
116 } | |
117 | |
118 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
119 Atomic::dec((jint*) &_exiting_threads_count); | |
120 | |
121 if (thread->is_hidden_from_external_view() || | |
122 thread->is_jvmti_agent_thread()) { | |
123 return; | |
124 } | |
125 | |
126 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
127 | |
128 if (daemon) { | |
129 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
130 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
131 } | |
132 } | |
133 | |
134 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
135 assert(jt == JavaThread::current(), "Called by current thread"); | |
136 Atomic::inc((jint*) &_exiting_threads_count); | |
137 | |
138 oop threadObj = jt->threadObj(); | |
139 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
140 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
141 } | |
142 } | |
143 | |
144 // FIXME: JVMTI should call this function | |
145 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
146 assert(thread != NULL, "should be non-NULL"); | |
147 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
148 | |
149 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
150 | |
151 oop obj = NULL; | |
152 if (wait_obj != NULL) { | |
153 // thread is doing an Object.wait() call | |
154 obj = (oop) wait_obj->object(); | |
155 assert(obj != NULL, "Object.wait() should have an object"); | |
156 } else { | |
157 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
158 if (enter_obj != NULL) { | |
159 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
160 obj = (oop) enter_obj->object(); | |
161 } | |
162 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
163 } | |
164 | |
165 Handle h(obj); | |
166 return h; | |
167 } | |
168 | |
169 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
170 MutexLocker m(Management_lock); | |
171 | |
172 bool prev = _thread_monitoring_contention_enabled; | |
173 _thread_monitoring_contention_enabled = flag; | |
174 | |
175 return prev; | |
176 } | |
177 | |
178 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
179 MutexLocker m(Management_lock); | |
180 | |
181 bool prev = _thread_cpu_time_enabled; | |
182 _thread_cpu_time_enabled = flag; | |
183 | |
184 return prev; | |
185 } | |
186 | |
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187 bool ThreadService::set_thread_allocated_memory_enabled(bool flag) { |
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188 MutexLocker m(Management_lock); |
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189 |
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190 bool prev = _thread_allocated_memory_enabled; |
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191 _thread_allocated_memory_enabled = flag; |
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192 |
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193 return prev; |
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194 } |
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195 |
0 | 196 // GC support |
197 void ThreadService::oops_do(OopClosure* f) { | |
198 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
199 dump->oops_do(f); | |
200 } | |
201 } | |
202 | |
203 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { | |
204 MutexLocker ml(Management_lock); | |
205 if (_threaddump_list == NULL) { | |
206 _threaddump_list = dump; | |
207 } else { | |
208 dump->set_next(_threaddump_list); | |
209 _threaddump_list = dump; | |
210 } | |
211 } | |
212 | |
213 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
214 MutexLocker ml(Management_lock); | |
215 | |
216 ThreadDumpResult* prev = NULL; | |
217 bool found = false; | |
218 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
219 if (d == dump) { | |
220 if (prev == NULL) { | |
221 _threaddump_list = dump->next(); | |
222 } else { | |
223 prev->set_next(dump->next()); | |
224 } | |
225 found = true; | |
226 break; | |
227 } | |
228 } | |
229 assert(found, "The threaddump result to be removed must exist."); | |
230 } | |
231 | |
232 // Dump stack trace of threads specified in the given threads array. | |
233 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
234 // the corresponding entry in the given threads array | |
235 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
236 int num_threads, | |
237 TRAPS) { | |
238 assert(num_threads > 0, "just checking"); | |
239 | |
240 ThreadDumpResult dump_result; | |
241 VM_ThreadDump op(&dump_result, | |
242 threads, | |
243 num_threads, | |
244 -1, /* entire stack */ | |
245 false, /* with locked monitors */ | |
246 false /* with locked synchronizers */); | |
247 VMThread::execute(&op); | |
248 | |
249 // Allocate the resulting StackTraceElement[][] object | |
250 | |
251 ResourceMark rm(THREAD); | |
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252 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackTraceElement_array(), true, CHECK_NH); |
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253 ObjArrayKlass* ik = ObjArrayKlass::cast(k); |
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254 objArrayOop r = oopFactory::new_objArray(ik, num_threads, CHECK_NH); |
0 | 255 objArrayHandle result_obj(THREAD, r); |
256 | |
257 int num_snapshots = dump_result.num_snapshots(); | |
258 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
259 int i = 0; | |
260 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
261 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
262 if (stacktrace == NULL) { | |
263 // No stack trace | |
264 result_obj->obj_at_put(i, NULL); | |
265 } else { | |
266 // Construct an array of java/lang/StackTraceElement object | |
267 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
268 result_obj->obj_at_put(i, backtrace_h()); | |
269 } | |
270 } | |
271 | |
272 return result_obj; | |
273 } | |
274 | |
275 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
276 ThreadStatistics* stat = thread->get_thread_stat(); | |
277 if (stat != NULL) { | |
278 stat->reset_count_stat(); | |
279 } | |
280 } | |
281 | |
282 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
283 ThreadStatistics* stat = thread->get_thread_stat(); | |
284 if (stat != NULL) { | |
285 stat->reset_time_stat(); | |
286 } | |
287 } | |
288 | |
289 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
290 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
291 // This code was modified from the original Threads::find_deadlocks code. | |
292 int globalDfn = 0, thisDfn; | |
293 ObjectMonitor* waitingToLockMonitor = NULL; | |
294 oop waitingToLockBlocker = NULL; | |
295 bool blocked_on_monitor = false; | |
296 JavaThread *currentThread, *previousThread; | |
297 int num_deadlocks = 0; | |
298 | |
299 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
300 // Initialize the depth-first-number | |
301 p->set_depth_first_number(-1); | |
302 } | |
303 | |
304 DeadlockCycle* deadlocks = NULL; | |
305 DeadlockCycle* last = NULL; | |
306 DeadlockCycle* cycle = new DeadlockCycle(); | |
307 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
308 if (jt->depth_first_number() >= 0) { | |
309 // this thread was already visited | |
310 continue; | |
311 } | |
312 | |
313 thisDfn = globalDfn; | |
314 jt->set_depth_first_number(globalDfn++); | |
315 previousThread = jt; | |
316 currentThread = jt; | |
317 | |
318 cycle->reset(); | |
319 | |
320 // When there is a deadlock, all the monitors involved in the dependency | |
321 // cycle must be contended and heavyweight. So we only care about the | |
322 // heavyweight monitor a thread is waiting to lock. | |
323 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
324 if (concurrent_locks) { | |
325 waitingToLockBlocker = jt->current_park_blocker(); | |
326 } | |
327 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
328 cycle->add_thread(currentThread); | |
329 if (waitingToLockMonitor != NULL) { | |
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330 address currentOwner = (address)waitingToLockMonitor->owner(); |
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331 if (currentOwner != NULL) { |
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332 currentThread = Threads::owning_thread_from_monitor_owner( |
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333 currentOwner, |
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334 false /* no locking needed */); |
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335 if (currentThread == NULL) { |
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336 // This function is called at a safepoint so the JavaThread |
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337 // that owns waitingToLockMonitor should be findable, but |
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338 // if it is not findable, then the previous currentThread is |
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339 // blocked permanently. We record this as a deadlock. |
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340 num_deadlocks++; |
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341 |
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342 cycle->set_deadlock(true); |
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343 |
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344 // add this cycle to the deadlocks list |
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345 if (deadlocks == NULL) { |
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346 deadlocks = cycle; |
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347 } else { |
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348 last->set_next(cycle); |
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349 } |
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350 last = cycle; |
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351 cycle = new DeadlockCycle(); |
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352 break; |
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353 } |
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354 } |
0 | 355 } else { |
356 if (concurrent_locks) { | |
357 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
358 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
359 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
360 } else { | |
361 currentThread = NULL; | |
362 } | |
363 } | |
364 } | |
365 | |
366 if (currentThread == NULL) { | |
367 // No dependency on another thread | |
368 break; | |
369 } | |
370 if (currentThread->depth_first_number() < 0) { | |
371 // First visit to this thread | |
372 currentThread->set_depth_first_number(globalDfn++); | |
373 } else if (currentThread->depth_first_number() < thisDfn) { | |
374 // Thread already visited, and not on a (new) cycle | |
375 break; | |
376 } else if (currentThread == previousThread) { | |
377 // Self-loop, ignore | |
378 break; | |
379 } else { | |
380 // We have a (new) cycle | |
381 num_deadlocks++; | |
382 | |
383 cycle->set_deadlock(true); | |
384 | |
385 // add this cycle to the deadlocks list | |
386 if (deadlocks == NULL) { | |
387 deadlocks = cycle; | |
388 } else { | |
389 last->set_next(cycle); | |
390 } | |
391 last = cycle; | |
392 cycle = new DeadlockCycle(); | |
393 break; | |
394 } | |
395 previousThread = currentThread; | |
396 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
397 if (concurrent_locks) { | |
398 waitingToLockBlocker = currentThread->current_park_blocker(); | |
399 } | |
400 } | |
401 | |
402 } | |
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403 delete cycle; |
0 | 404 return deadlocks; |
405 } | |
406 | |
407 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
408 | |
409 // Create a new ThreadDumpResult object and append to the list. | |
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410 // If GC happens before this function returns, Method* |
0 | 411 // in the stack trace will be visited. |
412 ThreadService::add_thread_dump(this); | |
413 } | |
414 | |
415 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
416 // Create a new ThreadDumpResult object and append to the list. | |
417 // If GC happens before this function returns, oops | |
418 // will be visited. | |
419 ThreadService::add_thread_dump(this); | |
420 } | |
421 | |
422 ThreadDumpResult::~ThreadDumpResult() { | |
423 ThreadService::remove_thread_dump(this); | |
424 | |
425 // free all the ThreadSnapshot objects created during | |
426 // the VM_ThreadDump operation | |
427 ThreadSnapshot* ts = _snapshots; | |
428 while (ts != NULL) { | |
429 ThreadSnapshot* p = ts; | |
430 ts = ts->next(); | |
431 delete p; | |
432 } | |
433 } | |
434 | |
435 | |
436 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
437 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
438 "_num_snapshots must be less than _num_threads"); | |
439 _num_snapshots++; | |
440 if (_snapshots == NULL) { | |
441 _snapshots = ts; | |
442 } else { | |
443 _last->set_next(ts); | |
444 } | |
445 _last = ts; | |
446 } | |
447 | |
448 void ThreadDumpResult::oops_do(OopClosure* f) { | |
449 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
450 ts->oops_do(f); | |
451 } | |
452 } | |
453 | |
454 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { | |
455 _method = jvf->method(); | |
456 _bci = jvf->bci(); | |
457 _locked_monitors = NULL; | |
458 if (with_lock_info) { | |
459 ResourceMark rm; | |
460 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
461 int length = list->length(); | |
462 if (length > 0) { | |
6197 | 463 _locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(length, true); |
0 | 464 for (int i = 0; i < length; i++) { |
465 MonitorInfo* monitor = list->at(i); | |
466 assert(monitor->owner(), "This monitor must have an owning object"); | |
467 _locked_monitors->append(monitor->owner()); | |
468 } | |
469 } | |
470 } | |
471 } | |
472 | |
473 void StackFrameInfo::oops_do(OopClosure* f) { | |
474 if (_locked_monitors != NULL) { | |
475 int length = _locked_monitors->length(); | |
476 for (int i = 0; i < length; i++) { | |
477 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
478 } | |
479 } | |
480 } | |
481 | |
482 void StackFrameInfo::print_on(outputStream* st) const { | |
483 ResourceMark rm; | |
484 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
485 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
486 for (int i = 0; i < len; i++) { | |
487 oop o = _locked_monitors->at(i); | |
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488 InstanceKlass* ik = InstanceKlass::cast(o->klass()); |
0 | 489 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); |
490 } | |
491 | |
492 } | |
493 | |
494 // Iterate through monitor cache to find JNI locked monitors | |
495 class InflatedMonitorsClosure: public MonitorClosure { | |
496 private: | |
497 ThreadStackTrace* _stack_trace; | |
498 Thread* _thread; | |
499 public: | |
500 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
501 _thread = t; | |
502 _stack_trace = st; | |
503 } | |
504 void do_monitor(ObjectMonitor* mid) { | |
505 if (mid->owner() == _thread) { | |
506 oop object = (oop) mid->object(); | |
507 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
508 _stack_trace->add_jni_locked_monitor(object); | |
509 } | |
510 } | |
511 } | |
512 }; | |
513 | |
514 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
515 _thread = t; | |
6197 | 516 _frames = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); |
0 | 517 _depth = 0; |
518 _with_locked_monitors = with_locked_monitors; | |
519 if (_with_locked_monitors) { | |
6197 | 520 _jni_locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); |
0 | 521 } else { |
522 _jni_locked_monitors = NULL; | |
523 } | |
524 } | |
525 | |
526 ThreadStackTrace::~ThreadStackTrace() { | |
527 for (int i = 0; i < _frames->length(); i++) { | |
528 delete _frames->at(i); | |
529 } | |
530 delete _frames; | |
531 if (_jni_locked_monitors != NULL) { | |
532 delete _jni_locked_monitors; | |
533 } | |
534 } | |
535 | |
536 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
537 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
538 | |
539 if (_thread->has_last_Java_frame()) { | |
540 RegisterMap reg_map(_thread); | |
541 vframe* start_vf = _thread->last_java_vframe(®_map); | |
542 int count = 0; | |
543 for (vframe* f = start_vf; f; f = f->sender() ) { | |
544 if (f->is_java_frame()) { | |
545 javaVFrame* jvf = javaVFrame::cast(f); | |
546 add_stack_frame(jvf); | |
547 count++; | |
548 } else { | |
549 // Ignore non-Java frames | |
550 } | |
551 if (maxDepth > 0 && count == maxDepth) { | |
552 // Skip frames if more than maxDepth | |
553 break; | |
554 } | |
555 } | |
556 } | |
557 | |
558 if (_with_locked_monitors) { | |
559 // Iterate inflated monitors and find monitors locked by this thread | |
560 // not found in the stack | |
561 InflatedMonitorsClosure imc(_thread, this); | |
562 ObjectSynchronizer::monitors_iterate(&imc); | |
563 } | |
564 } | |
565 | |
566 | |
567 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
568 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
569 | |
570 bool found = false; | |
571 int num_frames = get_stack_depth(); | |
572 for (int depth = 0; depth < num_frames; depth++) { | |
573 StackFrameInfo* frame = stack_frame_at(depth); | |
574 int len = frame->num_locked_monitors(); | |
575 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
576 for (int j = 0; j < len; j++) { | |
577 oop monitor = locked_monitors->at(j); | |
578 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
579 if (monitor == object) { | |
580 found = true; | |
581 break; | |
582 } | |
583 } | |
584 } | |
585 return found; | |
586 } | |
587 | |
588 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
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589 Klass* k = SystemDictionary::StackTraceElement_klass(); |
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590 assert(k != NULL, "must be loaded in 1.4+"); |
0 | 591 instanceKlassHandle ik(THREAD, k); |
592 | |
593 // Allocate an array of java/lang/StackTraceElement object | |
594 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
595 objArrayHandle backtrace(THREAD, ste); | |
596 for (int j = 0; j < _depth; j++) { | |
597 StackFrameInfo* frame = _frames->at(j); | |
598 methodHandle mh(THREAD, frame->method()); | |
599 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
600 backtrace->obj_at_put(j, element); | |
601 } | |
602 return backtrace; | |
603 } | |
604 | |
605 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
606 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
607 _frames->append(frame); | |
608 _depth++; | |
609 } | |
610 | |
611 void ThreadStackTrace::oops_do(OopClosure* f) { | |
612 int length = _frames->length(); | |
613 for (int i = 0; i < length; i++) { | |
614 _frames->at(i)->oops_do(f); | |
615 } | |
616 | |
617 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
618 for (int j = 0; j < length; j++) { | |
619 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
620 } | |
621 } | |
622 | |
623 ConcurrentLocksDump::~ConcurrentLocksDump() { | |
624 if (_retain_map_on_free) { | |
625 return; | |
626 } | |
627 | |
628 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
629 ThreadConcurrentLocks* tcl = t; | |
630 t = t->next(); | |
631 delete tcl; | |
632 } | |
633 } | |
634 | |
635 void ConcurrentLocksDump::dump_at_safepoint() { | |
636 // dump all locked concurrent locks | |
637 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
638 | |
639 if (JDK_Version::is_gte_jdk16x_version()) { | |
640 ResourceMark rm; | |
641 | |
642 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
643 | |
644 // Find all instances of AbstractOwnableSynchronizer | |
645 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
646 aos_objects); | |
647 // Build a map of thread to its owned AQS locks | |
648 build_map(aos_objects); | |
649 } | |
650 } | |
651 | |
652 | |
653 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
654 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
655 int length = aos_objects->length(); | |
656 for (int i = 0; i < length; i++) { | |
657 oop o = aos_objects->at(i); | |
658 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
659 if (owner_thread_obj != NULL) { | |
660 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
661 assert(o->is_instance(), "Must be an instanceOop"); | |
662 add_lock(thread, (instanceOop) o); | |
663 } | |
664 } | |
665 } | |
666 | |
667 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
668 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
669 if (tcl != NULL) { | |
670 tcl->add_lock(o); | |
671 return; | |
672 } | |
673 | |
674 // First owned lock found for this thread | |
675 tcl = new ThreadConcurrentLocks(thread); | |
676 tcl->add_lock(o); | |
677 if (_map == NULL) { | |
678 _map = tcl; | |
679 } else { | |
680 _last->set_next(tcl); | |
681 } | |
682 _last = tcl; | |
683 } | |
684 | |
685 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
686 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
687 if (tcl->java_thread() == thread) { | |
688 return tcl; | |
689 } | |
690 } | |
691 return NULL; | |
692 } | |
693 | |
694 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
695 st->print_cr(" Locked ownable synchronizers:"); | |
696 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
697 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
698 if (locks == NULL || locks->is_empty()) { | |
699 st->print_cr("\t- None"); | |
700 st->cr(); | |
701 return; | |
702 } | |
703 | |
704 for (int i = 0; i < locks->length(); i++) { | |
705 instanceOop obj = locks->at(i); | |
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706 InstanceKlass* ik = InstanceKlass::cast(obj->klass()); |
0 | 707 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); |
708 } | |
709 st->cr(); | |
710 } | |
711 | |
712 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
713 _thread = thread; | |
6197 | 714 _owned_locks = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); |
0 | 715 _next = NULL; |
716 } | |
717 | |
718 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
719 delete _owned_locks; | |
720 } | |
721 | |
722 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
723 _owned_locks->append(o); | |
724 } | |
725 | |
726 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
727 int length = _owned_locks->length(); | |
728 for (int i = 0; i < length; i++) { | |
729 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
730 } | |
731 } | |
732 | |
733 ThreadStatistics::ThreadStatistics() { | |
734 _contended_enter_count = 0; | |
735 _monitor_wait_count = 0; | |
736 _sleep_count = 0; | |
737 _count_pending_reset = false; | |
738 _timer_pending_reset = false; | |
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739 memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts)); |
0 | 740 } |
741 | |
742 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
743 _thread = thread; | |
744 _threadObj = thread->threadObj(); | |
745 _stack_trace = NULL; | |
746 _concurrent_locks = NULL; | |
747 _next = NULL; | |
748 | |
749 ThreadStatistics* stat = thread->get_thread_stat(); | |
750 _contended_enter_ticks = stat->contended_enter_ticks(); | |
751 _contended_enter_count = stat->contended_enter_count(); | |
752 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
753 _monitor_wait_count = stat->monitor_wait_count(); | |
754 _sleep_ticks = stat->sleep_ticks(); | |
755 _sleep_count = stat->sleep_count(); | |
756 | |
757 _blocker_object = NULL; | |
758 _blocker_object_owner = NULL; | |
759 | |
760 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
761 _is_ext_suspended = thread->is_being_ext_suspended(); | |
762 _is_in_native = (thread->thread_state() == _thread_in_native); | |
763 | |
764 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
765 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
766 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
767 | |
768 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
769 if (obj() == NULL) { | |
770 // monitor no longer exists; thread is not blocked | |
771 _thread_status = java_lang_Thread::RUNNABLE; | |
772 } else { | |
773 _blocker_object = obj(); | |
774 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
775 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
4006 | 776 || (owner != NULL && owner->is_attaching_via_jni())) { |
0 | 777 // ownership information of the monitor is not available |
778 // (may no longer be owned or releasing to some other thread) | |
779 // make this thread in RUNNABLE state. | |
780 // And when the owner thread is in attaching state, the java thread | |
781 // is not completely initialized. For example thread name and id | |
782 // and may not be set, so hide the attaching thread. | |
783 _thread_status = java_lang_Thread::RUNNABLE; | |
784 _blocker_object = NULL; | |
785 } else if (owner != NULL) { | |
786 _blocker_object_owner = owner->threadObj(); | |
787 } | |
788 } | |
789 } | |
790 | |
791 // Support for JSR-166 locks | |
242 | 792 if (JDK_Version::current().supports_thread_park_blocker() && |
0 | 793 (_thread_status == java_lang_Thread::PARKED || |
794 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
795 | |
796 _blocker_object = thread->current_park_blocker(); | |
797 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
798 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
799 } | |
800 } | |
801 } | |
802 | |
803 ThreadSnapshot::~ThreadSnapshot() { | |
804 delete _stack_trace; | |
805 delete _concurrent_locks; | |
806 } | |
807 | |
808 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
809 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
810 _stack_trace->dump_stack_at_safepoint(max_depth); | |
811 } | |
812 | |
813 | |
814 void ThreadSnapshot::oops_do(OopClosure* f) { | |
815 f->do_oop(&_threadObj); | |
816 f->do_oop(&_blocker_object); | |
817 f->do_oop(&_blocker_object_owner); | |
818 if (_stack_trace != NULL) { | |
819 _stack_trace->oops_do(f); | |
820 } | |
821 if (_concurrent_locks != NULL) { | |
822 _concurrent_locks->oops_do(f); | |
823 } | |
824 } | |
825 | |
826 DeadlockCycle::DeadlockCycle() { | |
827 _is_deadlock = false; | |
6197 | 828 _threads = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); |
0 | 829 _next = NULL; |
830 } | |
831 | |
832 DeadlockCycle::~DeadlockCycle() { | |
833 delete _threads; | |
834 } | |
835 | |
836 void DeadlockCycle::print_on(outputStream* st) const { | |
837 st->cr(); | |
838 st->print_cr("Found one Java-level deadlock:"); | |
839 st->print("============================="); | |
840 | |
841 JavaThread* currentThread; | |
842 ObjectMonitor* waitingToLockMonitor; | |
843 oop waitingToLockBlocker; | |
844 int len = _threads->length(); | |
845 for (int i = 0; i < len; i++) { | |
846 currentThread = _threads->at(i); | |
847 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
848 waitingToLockBlocker = currentThread->current_park_blocker(); | |
849 st->cr(); | |
850 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
851 const char* owner_desc = ",\n which is held by"; | |
852 if (waitingToLockMonitor != NULL) { | |
853 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
854 oop obj = (oop)waitingToLockMonitor->object(); | |
855 if (obj != NULL) { | |
856 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
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857 (InstanceKlass::cast(obj->klass()))->external_name()); |
0 | 858 |
859 if (!currentThread->current_pending_monitor_is_from_java()) { | |
860 owner_desc = "\n in JNI, which is held by"; | |
861 } | |
862 } else { | |
863 // No Java object associated - a JVMTI raw monitor | |
864 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
865 } | |
866 currentThread = Threads::owning_thread_from_monitor_owner( | |
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867 (address)waitingToLockMonitor->owner(), |
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868 false /* no locking needed */); |
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869 if (currentThread == NULL) { |
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870 // The deadlock was detected at a safepoint so the JavaThread |
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871 // that owns waitingToLockMonitor should be findable, but |
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872 // if it is not findable, then the previous currentThread is |
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873 // blocked permanently. |
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874 st->print("%s UNKNOWN_owner_addr=" PTR_FORMAT, owner_desc, |
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875 (address)waitingToLockMonitor->owner()); |
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876 continue; |
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877 } |
0 | 878 } else { |
879 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
880 (address)waitingToLockBlocker, | |
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881 (InstanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); |
0 | 882 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), |
883 "Must be an AbstractOwnableSynchronizer"); | |
884 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
885 currentThread = java_lang_Thread::thread(ownerObj); | |
886 } | |
887 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
888 } | |
889 | |
890 st->cr(); | |
891 st->cr(); | |
892 | |
893 // Print stack traces | |
894 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
895 JavaMonitorsInStackTrace = true; | |
896 st->print_cr("Java stack information for the threads listed above:"); | |
897 st->print_cr("==================================================="); | |
898 for (int j = 0; j < len; j++) { | |
899 currentThread = _threads->at(j); | |
900 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
901 currentThread->print_stack_on(st); | |
902 } | |
903 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
904 } | |
905 | |
906 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
907 bool include_jvmti_agent_threads, | |
908 bool include_jni_attaching_threads) { | |
909 assert(cur_thread == Thread::current(), "Check current thread"); | |
910 | |
911 int init_size = ThreadService::get_live_thread_count(); | |
912 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
913 | |
914 MutexLockerEx ml(Threads_lock); | |
915 | |
916 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
917 // skips JavaThreads in the process of exiting | |
918 // and also skips VM internal JavaThreads | |
919 // Threads in _thread_new or _thread_new_trans state are included. | |
920 // i.e. threads have been started but not yet running. | |
921 if (jt->threadObj() == NULL || | |
922 jt->is_exiting() || | |
923 !java_lang_Thread::is_alive(jt->threadObj()) || | |
924 jt->is_hidden_from_external_view()) { | |
925 continue; | |
926 } | |
927 | |
928 // skip agent threads | |
929 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
930 continue; | |
931 } | |
932 | |
933 // skip jni threads in the process of attaching | |
4006 | 934 if (!include_jni_attaching_threads && jt->is_attaching_via_jni()) { |
0 | 935 continue; |
936 } | |
937 | |
938 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
939 _threads_array->append(h); | |
940 } | |
941 } |