Mercurial > hg > truffle
annotate src/share/vm/services/threadService.cpp @ 20380:9337d0e7ea4f
8055919: Remove dead code in G1 concurrent marking code
Reviewed-by: jmasa, jwilhelm
author | tschatzl |
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date | Tue, 02 Sep 2014 15:04:00 +0200 |
parents | ce8f6bb717c9 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "memory/allocation.hpp" | |
28 #include "memory/heapInspection.hpp" | |
29 #include "memory/oopFactory.hpp" | |
30 #include "oops/instanceKlass.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/handles.inline.hpp" | |
33 #include "runtime/init.hpp" | |
34 #include "runtime/thread.hpp" | |
35 #include "runtime/vframe.hpp" | |
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36 #include "runtime/thread.inline.hpp" |
1972 | 37 #include "runtime/vmThread.hpp" |
38 #include "runtime/vm_operations.hpp" | |
39 #include "services/threadService.hpp" | |
0 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
0 | 43 // TODO: we need to define a naming convention for perf counters |
44 // to distinguish counters for: | |
45 // - standard JSR174 use | |
46 // - Hotspot extension (public and committed) | |
47 // - Hotspot extension (private/internal and uncommitted) | |
48 | |
49 // Default is disabled. | |
50 bool ThreadService::_thread_monitoring_contention_enabled = false; | |
51 bool ThreadService::_thread_cpu_time_enabled = false; | |
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52 bool ThreadService::_thread_allocated_memory_enabled = false; |
0 | 53 |
54 PerfCounter* ThreadService::_total_threads_count = NULL; | |
55 PerfVariable* ThreadService::_live_threads_count = NULL; | |
56 PerfVariable* ThreadService::_peak_threads_count = NULL; | |
57 PerfVariable* ThreadService::_daemon_threads_count = NULL; | |
58 volatile int ThreadService::_exiting_threads_count = 0; | |
59 volatile int ThreadService::_exiting_daemon_threads_count = 0; | |
60 | |
61 ThreadDumpResult* ThreadService::_threaddump_list = NULL; | |
62 | |
63 static const int INITIAL_ARRAY_SIZE = 10; | |
64 | |
65 void ThreadService::init() { | |
66 EXCEPTION_MARK; | |
67 | |
68 // These counters are for java.lang.management API support. | |
69 // They are created even if -XX:-UsePerfData is set and in | |
70 // that case, they will be allocated on C heap. | |
71 | |
72 _total_threads_count = | |
73 PerfDataManager::create_counter(JAVA_THREADS, "started", | |
74 PerfData::U_Events, CHECK); | |
75 | |
76 _live_threads_count = | |
77 PerfDataManager::create_variable(JAVA_THREADS, "live", | |
78 PerfData::U_None, CHECK); | |
79 | |
80 _peak_threads_count = | |
81 PerfDataManager::create_variable(JAVA_THREADS, "livePeak", | |
82 PerfData::U_None, CHECK); | |
83 | |
84 _daemon_threads_count = | |
85 PerfDataManager::create_variable(JAVA_THREADS, "daemon", | |
86 PerfData::U_None, CHECK); | |
87 | |
88 if (os::is_thread_cpu_time_supported()) { | |
89 _thread_cpu_time_enabled = true; | |
90 } | |
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91 |
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92 _thread_allocated_memory_enabled = true; // Always on, so enable it |
0 | 93 } |
94 | |
95 void ThreadService::reset_peak_thread_count() { | |
96 // Acquire the lock to update the peak thread count | |
97 // to synchronize with thread addition and removal. | |
98 MutexLockerEx mu(Threads_lock); | |
99 _peak_threads_count->set_value(get_live_thread_count()); | |
100 } | |
101 | |
102 void ThreadService::add_thread(JavaThread* thread, bool daemon) { | |
103 // Do not count VM internal or JVMTI agent threads | |
104 if (thread->is_hidden_from_external_view() || | |
105 thread->is_jvmti_agent_thread()) { | |
106 return; | |
107 } | |
108 | |
109 _total_threads_count->inc(); | |
110 _live_threads_count->inc(); | |
111 | |
112 if (_live_threads_count->get_value() > _peak_threads_count->get_value()) { | |
113 _peak_threads_count->set_value(_live_threads_count->get_value()); | |
114 } | |
115 | |
116 if (daemon) { | |
117 _daemon_threads_count->inc(); | |
118 } | |
119 } | |
120 | |
121 void ThreadService::remove_thread(JavaThread* thread, bool daemon) { | |
122 Atomic::dec((jint*) &_exiting_threads_count); | |
123 | |
124 if (thread->is_hidden_from_external_view() || | |
125 thread->is_jvmti_agent_thread()) { | |
126 return; | |
127 } | |
128 | |
129 _live_threads_count->set_value(_live_threads_count->get_value() - 1); | |
130 | |
131 if (daemon) { | |
132 _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1); | |
133 Atomic::dec((jint*) &_exiting_daemon_threads_count); | |
134 } | |
135 } | |
136 | |
137 void ThreadService::current_thread_exiting(JavaThread* jt) { | |
138 assert(jt == JavaThread::current(), "Called by current thread"); | |
139 Atomic::inc((jint*) &_exiting_threads_count); | |
140 | |
141 oop threadObj = jt->threadObj(); | |
142 if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) { | |
143 Atomic::inc((jint*) &_exiting_daemon_threads_count); | |
144 } | |
145 } | |
146 | |
147 // FIXME: JVMTI should call this function | |
148 Handle ThreadService::get_current_contended_monitor(JavaThread* thread) { | |
149 assert(thread != NULL, "should be non-NULL"); | |
150 assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint"); | |
151 | |
152 ObjectMonitor *wait_obj = thread->current_waiting_monitor(); | |
153 | |
154 oop obj = NULL; | |
155 if (wait_obj != NULL) { | |
156 // thread is doing an Object.wait() call | |
157 obj = (oop) wait_obj->object(); | |
158 assert(obj != NULL, "Object.wait() should have an object"); | |
159 } else { | |
160 ObjectMonitor *enter_obj = thread->current_pending_monitor(); | |
161 if (enter_obj != NULL) { | |
162 // thread is trying to enter() or raw_enter() an ObjectMonitor. | |
163 obj = (oop) enter_obj->object(); | |
164 } | |
165 // If obj == NULL, then ObjectMonitor is raw which doesn't count. | |
166 } | |
167 | |
168 Handle h(obj); | |
169 return h; | |
170 } | |
171 | |
172 bool ThreadService::set_thread_monitoring_contention(bool flag) { | |
173 MutexLocker m(Management_lock); | |
174 | |
175 bool prev = _thread_monitoring_contention_enabled; | |
176 _thread_monitoring_contention_enabled = flag; | |
177 | |
178 return prev; | |
179 } | |
180 | |
181 bool ThreadService::set_thread_cpu_time_enabled(bool flag) { | |
182 MutexLocker m(Management_lock); | |
183 | |
184 bool prev = _thread_cpu_time_enabled; | |
185 _thread_cpu_time_enabled = flag; | |
186 | |
187 return prev; | |
188 } | |
189 | |
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190 bool ThreadService::set_thread_allocated_memory_enabled(bool flag) { |
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191 MutexLocker m(Management_lock); |
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192 |
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193 bool prev = _thread_allocated_memory_enabled; |
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194 _thread_allocated_memory_enabled = flag; |
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195 |
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196 return prev; |
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197 } |
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198 |
0 | 199 // GC support |
200 void ThreadService::oops_do(OopClosure* f) { | |
201 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { | |
202 dump->oops_do(f); | |
203 } | |
204 } | |
205 | |
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206 void ThreadService::metadata_do(void f(Metadata*)) { |
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207 for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) { |
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208 dump->metadata_do(f); |
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209 } |
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210 } |
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211 |
0 | 212 void ThreadService::add_thread_dump(ThreadDumpResult* dump) { |
213 MutexLocker ml(Management_lock); | |
214 if (_threaddump_list == NULL) { | |
215 _threaddump_list = dump; | |
216 } else { | |
217 dump->set_next(_threaddump_list); | |
218 _threaddump_list = dump; | |
219 } | |
220 } | |
221 | |
222 void ThreadService::remove_thread_dump(ThreadDumpResult* dump) { | |
223 MutexLocker ml(Management_lock); | |
224 | |
225 ThreadDumpResult* prev = NULL; | |
226 bool found = false; | |
227 for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) { | |
228 if (d == dump) { | |
229 if (prev == NULL) { | |
230 _threaddump_list = dump->next(); | |
231 } else { | |
232 prev->set_next(dump->next()); | |
233 } | |
234 found = true; | |
235 break; | |
236 } | |
237 } | |
238 assert(found, "The threaddump result to be removed must exist."); | |
239 } | |
240 | |
241 // Dump stack trace of threads specified in the given threads array. | |
242 // Returns StackTraceElement[][] each element is the stack trace of a thread in | |
243 // the corresponding entry in the given threads array | |
244 Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
245 int num_threads, | |
246 TRAPS) { | |
247 assert(num_threads > 0, "just checking"); | |
248 | |
249 ThreadDumpResult dump_result; | |
250 VM_ThreadDump op(&dump_result, | |
251 threads, | |
252 num_threads, | |
253 -1, /* entire stack */ | |
254 false, /* with locked monitors */ | |
255 false /* with locked synchronizers */); | |
256 VMThread::execute(&op); | |
257 | |
258 // Allocate the resulting StackTraceElement[][] object | |
259 | |
260 ResourceMark rm(THREAD); | |
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261 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackTraceElement_array(), true, CHECK_NH); |
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262 ObjArrayKlass* ik = ObjArrayKlass::cast(k); |
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263 objArrayOop r = oopFactory::new_objArray(ik, num_threads, CHECK_NH); |
0 | 264 objArrayHandle result_obj(THREAD, r); |
265 | |
266 int num_snapshots = dump_result.num_snapshots(); | |
267 assert(num_snapshots == num_threads, "Must have num_threads thread snapshots"); | |
268 int i = 0; | |
269 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) { | |
270 ThreadStackTrace* stacktrace = ts->get_stack_trace(); | |
271 if (stacktrace == NULL) { | |
272 // No stack trace | |
273 result_obj->obj_at_put(i, NULL); | |
274 } else { | |
275 // Construct an array of java/lang/StackTraceElement object | |
276 Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH); | |
277 result_obj->obj_at_put(i, backtrace_h()); | |
278 } | |
279 } | |
280 | |
281 return result_obj; | |
282 } | |
283 | |
284 void ThreadService::reset_contention_count_stat(JavaThread* thread) { | |
285 ThreadStatistics* stat = thread->get_thread_stat(); | |
286 if (stat != NULL) { | |
287 stat->reset_count_stat(); | |
288 } | |
289 } | |
290 | |
291 void ThreadService::reset_contention_time_stat(JavaThread* thread) { | |
292 ThreadStatistics* stat = thread->get_thread_stat(); | |
293 if (stat != NULL) { | |
294 stat->reset_time_stat(); | |
295 } | |
296 } | |
297 | |
298 // Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true | |
299 DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) { | |
300 // This code was modified from the original Threads::find_deadlocks code. | |
301 int globalDfn = 0, thisDfn; | |
302 ObjectMonitor* waitingToLockMonitor = NULL; | |
303 oop waitingToLockBlocker = NULL; | |
304 bool blocked_on_monitor = false; | |
305 JavaThread *currentThread, *previousThread; | |
306 int num_deadlocks = 0; | |
307 | |
308 for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) { | |
309 // Initialize the depth-first-number | |
310 p->set_depth_first_number(-1); | |
311 } | |
312 | |
313 DeadlockCycle* deadlocks = NULL; | |
314 DeadlockCycle* last = NULL; | |
315 DeadlockCycle* cycle = new DeadlockCycle(); | |
316 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
317 if (jt->depth_first_number() >= 0) { | |
318 // this thread was already visited | |
319 continue; | |
320 } | |
321 | |
322 thisDfn = globalDfn; | |
323 jt->set_depth_first_number(globalDfn++); | |
324 previousThread = jt; | |
325 currentThread = jt; | |
326 | |
327 cycle->reset(); | |
328 | |
329 // When there is a deadlock, all the monitors involved in the dependency | |
330 // cycle must be contended and heavyweight. So we only care about the | |
331 // heavyweight monitor a thread is waiting to lock. | |
332 waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor(); | |
333 if (concurrent_locks) { | |
334 waitingToLockBlocker = jt->current_park_blocker(); | |
335 } | |
336 while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) { | |
337 cycle->add_thread(currentThread); | |
338 if (waitingToLockMonitor != NULL) { | |
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339 address currentOwner = (address)waitingToLockMonitor->owner(); |
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340 if (currentOwner != NULL) { |
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341 currentThread = Threads::owning_thread_from_monitor_owner( |
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342 currentOwner, |
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343 false /* no locking needed */); |
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344 if (currentThread == NULL) { |
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345 // This function is called at a safepoint so the JavaThread |
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346 // that owns waitingToLockMonitor should be findable, but |
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347 // if it is not findable, then the previous currentThread is |
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348 // blocked permanently. We record this as a deadlock. |
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349 num_deadlocks++; |
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350 |
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351 cycle->set_deadlock(true); |
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352 |
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353 // add this cycle to the deadlocks list |
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354 if (deadlocks == NULL) { |
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355 deadlocks = cycle; |
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356 } else { |
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357 last->set_next(cycle); |
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358 } |
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359 last = cycle; |
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360 cycle = new DeadlockCycle(); |
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361 break; |
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362 } |
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363 } |
0 | 364 } else { |
365 if (concurrent_locks) { | |
366 if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
367 oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
368 currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL; | |
369 } else { | |
370 currentThread = NULL; | |
371 } | |
372 } | |
373 } | |
374 | |
375 if (currentThread == NULL) { | |
376 // No dependency on another thread | |
377 break; | |
378 } | |
379 if (currentThread->depth_first_number() < 0) { | |
380 // First visit to this thread | |
381 currentThread->set_depth_first_number(globalDfn++); | |
382 } else if (currentThread->depth_first_number() < thisDfn) { | |
383 // Thread already visited, and not on a (new) cycle | |
384 break; | |
385 } else if (currentThread == previousThread) { | |
386 // Self-loop, ignore | |
387 break; | |
388 } else { | |
389 // We have a (new) cycle | |
390 num_deadlocks++; | |
391 | |
392 cycle->set_deadlock(true); | |
393 | |
394 // add this cycle to the deadlocks list | |
395 if (deadlocks == NULL) { | |
396 deadlocks = cycle; | |
397 } else { | |
398 last->set_next(cycle); | |
399 } | |
400 last = cycle; | |
401 cycle = new DeadlockCycle(); | |
402 break; | |
403 } | |
404 previousThread = currentThread; | |
405 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
406 if (concurrent_locks) { | |
407 waitingToLockBlocker = currentThread->current_park_blocker(); | |
408 } | |
409 } | |
410 | |
411 } | |
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412 delete cycle; |
0 | 413 return deadlocks; |
414 } | |
415 | |
416 ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
417 | |
418 // Create a new ThreadDumpResult object and append to the list. | |
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419 // If GC happens before this function returns, Method* |
0 | 420 // in the stack trace will be visited. |
421 ThreadService::add_thread_dump(this); | |
422 } | |
423 | |
424 ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) { | |
425 // Create a new ThreadDumpResult object and append to the list. | |
426 // If GC happens before this function returns, oops | |
427 // will be visited. | |
428 ThreadService::add_thread_dump(this); | |
429 } | |
430 | |
431 ThreadDumpResult::~ThreadDumpResult() { | |
432 ThreadService::remove_thread_dump(this); | |
433 | |
434 // free all the ThreadSnapshot objects created during | |
435 // the VM_ThreadDump operation | |
436 ThreadSnapshot* ts = _snapshots; | |
437 while (ts != NULL) { | |
438 ThreadSnapshot* p = ts; | |
439 ts = ts->next(); | |
440 delete p; | |
441 } | |
442 } | |
443 | |
444 | |
445 void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) { | |
446 assert(_num_threads == 0 || _num_snapshots < _num_threads, | |
447 "_num_snapshots must be less than _num_threads"); | |
448 _num_snapshots++; | |
449 if (_snapshots == NULL) { | |
450 _snapshots = ts; | |
451 } else { | |
452 _last->set_next(ts); | |
453 } | |
454 _last = ts; | |
455 } | |
456 | |
457 void ThreadDumpResult::oops_do(OopClosure* f) { | |
458 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { | |
459 ts->oops_do(f); | |
460 } | |
461 } | |
462 | |
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463 void ThreadDumpResult::metadata_do(void f(Metadata*)) { |
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464 for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) { |
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465 ts->metadata_do(f); |
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466 } |
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467 } |
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468 |
0 | 469 StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) { |
470 _method = jvf->method(); | |
471 _bci = jvf->bci(); | |
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472 _class_holder = _method->method_holder()->klass_holder(); |
0 | 473 _locked_monitors = NULL; |
474 if (with_lock_info) { | |
475 ResourceMark rm; | |
476 GrowableArray<MonitorInfo*>* list = jvf->locked_monitors(); | |
477 int length = list->length(); | |
478 if (length > 0) { | |
6197 | 479 _locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(length, true); |
0 | 480 for (int i = 0; i < length; i++) { |
481 MonitorInfo* monitor = list->at(i); | |
482 assert(monitor->owner(), "This monitor must have an owning object"); | |
483 _locked_monitors->append(monitor->owner()); | |
484 } | |
485 } | |
486 } | |
487 } | |
488 | |
489 void StackFrameInfo::oops_do(OopClosure* f) { | |
490 if (_locked_monitors != NULL) { | |
491 int length = _locked_monitors->length(); | |
492 for (int i = 0; i < length; i++) { | |
493 f->do_oop((oop*) _locked_monitors->adr_at(i)); | |
494 } | |
495 } | |
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496 f->do_oop(&_class_holder); |
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497 } |
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498 |
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499 void StackFrameInfo::metadata_do(void f(Metadata*)) { |
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500 f(_method); |
0 | 501 } |
502 | |
503 void StackFrameInfo::print_on(outputStream* st) const { | |
504 ResourceMark rm; | |
505 java_lang_Throwable::print_stack_element(st, method(), bci()); | |
506 int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0); | |
507 for (int i = 0; i < len; i++) { | |
508 oop o = _locked_monitors->at(i); | |
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509 InstanceKlass* ik = InstanceKlass::cast(o->klass()); |
0 | 510 st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name()); |
511 } | |
512 | |
513 } | |
514 | |
515 // Iterate through monitor cache to find JNI locked monitors | |
516 class InflatedMonitorsClosure: public MonitorClosure { | |
517 private: | |
518 ThreadStackTrace* _stack_trace; | |
519 Thread* _thread; | |
520 public: | |
521 InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) { | |
522 _thread = t; | |
523 _stack_trace = st; | |
524 } | |
525 void do_monitor(ObjectMonitor* mid) { | |
526 if (mid->owner() == _thread) { | |
527 oop object = (oop) mid->object(); | |
528 if (!_stack_trace->is_owned_monitor_on_stack(object)) { | |
529 _stack_trace->add_jni_locked_monitor(object); | |
530 } | |
531 } | |
532 } | |
533 }; | |
534 | |
535 ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) { | |
536 _thread = t; | |
6197 | 537 _frames = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true); |
0 | 538 _depth = 0; |
539 _with_locked_monitors = with_locked_monitors; | |
540 if (_with_locked_monitors) { | |
6197 | 541 _jni_locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true); |
0 | 542 } else { |
543 _jni_locked_monitors = NULL; | |
544 } | |
545 } | |
546 | |
547 ThreadStackTrace::~ThreadStackTrace() { | |
548 for (int i = 0; i < _frames->length(); i++) { | |
549 delete _frames->at(i); | |
550 } | |
551 delete _frames; | |
552 if (_jni_locked_monitors != NULL) { | |
553 delete _jni_locked_monitors; | |
554 } | |
555 } | |
556 | |
557 void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) { | |
558 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
559 | |
560 if (_thread->has_last_Java_frame()) { | |
561 RegisterMap reg_map(_thread); | |
562 vframe* start_vf = _thread->last_java_vframe(®_map); | |
563 int count = 0; | |
564 for (vframe* f = start_vf; f; f = f->sender() ) { | |
565 if (f->is_java_frame()) { | |
566 javaVFrame* jvf = javaVFrame::cast(f); | |
567 add_stack_frame(jvf); | |
568 count++; | |
569 } else { | |
570 // Ignore non-Java frames | |
571 } | |
572 if (maxDepth > 0 && count == maxDepth) { | |
573 // Skip frames if more than maxDepth | |
574 break; | |
575 } | |
576 } | |
577 } | |
578 | |
579 if (_with_locked_monitors) { | |
580 // Iterate inflated monitors and find monitors locked by this thread | |
581 // not found in the stack | |
582 InflatedMonitorsClosure imc(_thread, this); | |
583 ObjectSynchronizer::monitors_iterate(&imc); | |
584 } | |
585 } | |
586 | |
587 | |
588 bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) { | |
589 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
590 | |
591 bool found = false; | |
592 int num_frames = get_stack_depth(); | |
593 for (int depth = 0; depth < num_frames; depth++) { | |
594 StackFrameInfo* frame = stack_frame_at(depth); | |
595 int len = frame->num_locked_monitors(); | |
596 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); | |
597 for (int j = 0; j < len; j++) { | |
598 oop monitor = locked_monitors->at(j); | |
599 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); | |
600 if (monitor == object) { | |
601 found = true; | |
602 break; | |
603 } | |
604 } | |
605 } | |
606 return found; | |
607 } | |
608 | |
609 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) { | |
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610 Klass* k = SystemDictionary::StackTraceElement_klass(); |
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611 assert(k != NULL, "must be loaded in 1.4+"); |
0 | 612 instanceKlassHandle ik(THREAD, k); |
613 | |
614 // Allocate an array of java/lang/StackTraceElement object | |
615 objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH); | |
616 objArrayHandle backtrace(THREAD, ste); | |
617 for (int j = 0; j < _depth; j++) { | |
618 StackFrameInfo* frame = _frames->at(j); | |
619 methodHandle mh(THREAD, frame->method()); | |
620 oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH); | |
621 backtrace->obj_at_put(j, element); | |
622 } | |
623 return backtrace; | |
624 } | |
625 | |
626 void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) { | |
627 StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors); | |
628 _frames->append(frame); | |
629 _depth++; | |
630 } | |
631 | |
632 void ThreadStackTrace::oops_do(OopClosure* f) { | |
633 int length = _frames->length(); | |
634 for (int i = 0; i < length; i++) { | |
635 _frames->at(i)->oops_do(f); | |
636 } | |
637 | |
638 length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); | |
639 for (int j = 0; j < length; j++) { | |
640 f->do_oop((oop*) _jni_locked_monitors->adr_at(j)); | |
641 } | |
642 } | |
643 | |
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644 void ThreadStackTrace::metadata_do(void f(Metadata*)) { |
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645 int length = _frames->length(); |
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646 for (int i = 0; i < length; i++) { |
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647 _frames->at(i)->metadata_do(f); |
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648 } |
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649 } |
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650 |
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651 |
0 | 652 ConcurrentLocksDump::~ConcurrentLocksDump() { |
653 if (_retain_map_on_free) { | |
654 return; | |
655 } | |
656 | |
657 for (ThreadConcurrentLocks* t = _map; t != NULL;) { | |
658 ThreadConcurrentLocks* tcl = t; | |
659 t = t->next(); | |
660 delete tcl; | |
661 } | |
662 } | |
663 | |
664 void ConcurrentLocksDump::dump_at_safepoint() { | |
665 // dump all locked concurrent locks | |
666 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
667 | |
668 if (JDK_Version::is_gte_jdk16x_version()) { | |
669 ResourceMark rm; | |
670 | |
671 GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE); | |
672 | |
673 // Find all instances of AbstractOwnableSynchronizer | |
674 HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(), | |
675 aos_objects); | |
676 // Build a map of thread to its owned AQS locks | |
677 build_map(aos_objects); | |
678 } | |
679 } | |
680 | |
681 | |
682 // build a map of JavaThread to all its owned AbstractOwnableSynchronizer | |
683 void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) { | |
684 int length = aos_objects->length(); | |
685 for (int i = 0; i < length; i++) { | |
686 oop o = aos_objects->at(i); | |
687 oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o); | |
688 if (owner_thread_obj != NULL) { | |
689 JavaThread* thread = java_lang_Thread::thread(owner_thread_obj); | |
690 assert(o->is_instance(), "Must be an instanceOop"); | |
691 add_lock(thread, (instanceOop) o); | |
692 } | |
693 } | |
694 } | |
695 | |
696 void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) { | |
697 ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread); | |
698 if (tcl != NULL) { | |
699 tcl->add_lock(o); | |
700 return; | |
701 } | |
702 | |
703 // First owned lock found for this thread | |
704 tcl = new ThreadConcurrentLocks(thread); | |
705 tcl->add_lock(o); | |
706 if (_map == NULL) { | |
707 _map = tcl; | |
708 } else { | |
709 _last->set_next(tcl); | |
710 } | |
711 _last = tcl; | |
712 } | |
713 | |
714 ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) { | |
715 for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) { | |
716 if (tcl->java_thread() == thread) { | |
717 return tcl; | |
718 } | |
719 } | |
720 return NULL; | |
721 } | |
722 | |
723 void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) { | |
724 st->print_cr(" Locked ownable synchronizers:"); | |
725 ThreadConcurrentLocks* tcl = thread_concurrent_locks(t); | |
726 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); | |
727 if (locks == NULL || locks->is_empty()) { | |
728 st->print_cr("\t- None"); | |
729 st->cr(); | |
730 return; | |
731 } | |
732 | |
733 for (int i = 0; i < locks->length(); i++) { | |
734 instanceOop obj = locks->at(i); | |
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735 InstanceKlass* ik = InstanceKlass::cast(obj->klass()); |
0 | 736 st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name()); |
737 } | |
738 st->cr(); | |
739 } | |
740 | |
741 ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) { | |
742 _thread = thread; | |
6197 | 743 _owned_locks = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true); |
0 | 744 _next = NULL; |
745 } | |
746 | |
747 ThreadConcurrentLocks::~ThreadConcurrentLocks() { | |
748 delete _owned_locks; | |
749 } | |
750 | |
751 void ThreadConcurrentLocks::add_lock(instanceOop o) { | |
752 _owned_locks->append(o); | |
753 } | |
754 | |
755 void ThreadConcurrentLocks::oops_do(OopClosure* f) { | |
756 int length = _owned_locks->length(); | |
757 for (int i = 0; i < length; i++) { | |
758 f->do_oop((oop*) _owned_locks->adr_at(i)); | |
759 } | |
760 } | |
761 | |
762 ThreadStatistics::ThreadStatistics() { | |
763 _contended_enter_count = 0; | |
764 _monitor_wait_count = 0; | |
765 _sleep_count = 0; | |
766 _count_pending_reset = false; | |
767 _timer_pending_reset = false; | |
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768 memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts)); |
0 | 769 } |
770 | |
771 ThreadSnapshot::ThreadSnapshot(JavaThread* thread) { | |
772 _thread = thread; | |
773 _threadObj = thread->threadObj(); | |
774 _stack_trace = NULL; | |
775 _concurrent_locks = NULL; | |
776 _next = NULL; | |
777 | |
778 ThreadStatistics* stat = thread->get_thread_stat(); | |
779 _contended_enter_ticks = stat->contended_enter_ticks(); | |
780 _contended_enter_count = stat->contended_enter_count(); | |
781 _monitor_wait_ticks = stat->monitor_wait_ticks(); | |
782 _monitor_wait_count = stat->monitor_wait_count(); | |
783 _sleep_ticks = stat->sleep_ticks(); | |
784 _sleep_count = stat->sleep_count(); | |
785 | |
786 _blocker_object = NULL; | |
787 _blocker_object_owner = NULL; | |
788 | |
789 _thread_status = java_lang_Thread::get_thread_status(_threadObj); | |
790 _is_ext_suspended = thread->is_being_ext_suspended(); | |
791 _is_in_native = (thread->thread_state() == _thread_in_native); | |
792 | |
793 if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER || | |
794 _thread_status == java_lang_Thread::IN_OBJECT_WAIT || | |
795 _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) { | |
796 | |
797 Handle obj = ThreadService::get_current_contended_monitor(thread); | |
798 if (obj() == NULL) { | |
799 // monitor no longer exists; thread is not blocked | |
800 _thread_status = java_lang_Thread::RUNNABLE; | |
801 } else { | |
802 _blocker_object = obj(); | |
803 JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false); | |
804 if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER) | |
4006 | 805 || (owner != NULL && owner->is_attaching_via_jni())) { |
0 | 806 // ownership information of the monitor is not available |
807 // (may no longer be owned or releasing to some other thread) | |
808 // make this thread in RUNNABLE state. | |
809 // And when the owner thread is in attaching state, the java thread | |
810 // is not completely initialized. For example thread name and id | |
811 // and may not be set, so hide the attaching thread. | |
812 _thread_status = java_lang_Thread::RUNNABLE; | |
813 _blocker_object = NULL; | |
814 } else if (owner != NULL) { | |
815 _blocker_object_owner = owner->threadObj(); | |
816 } | |
817 } | |
818 } | |
819 | |
820 // Support for JSR-166 locks | |
242 | 821 if (JDK_Version::current().supports_thread_park_blocker() && |
0 | 822 (_thread_status == java_lang_Thread::PARKED || |
823 _thread_status == java_lang_Thread::PARKED_TIMED)) { | |
824 | |
825 _blocker_object = thread->current_park_blocker(); | |
826 if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) { | |
827 _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object); | |
828 } | |
829 } | |
830 } | |
831 | |
832 ThreadSnapshot::~ThreadSnapshot() { | |
833 delete _stack_trace; | |
834 delete _concurrent_locks; | |
835 } | |
836 | |
837 void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) { | |
838 _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors); | |
839 _stack_trace->dump_stack_at_safepoint(max_depth); | |
840 } | |
841 | |
842 | |
843 void ThreadSnapshot::oops_do(OopClosure* f) { | |
844 f->do_oop(&_threadObj); | |
845 f->do_oop(&_blocker_object); | |
846 f->do_oop(&_blocker_object_owner); | |
847 if (_stack_trace != NULL) { | |
848 _stack_trace->oops_do(f); | |
849 } | |
850 if (_concurrent_locks != NULL) { | |
851 _concurrent_locks->oops_do(f); | |
852 } | |
853 } | |
854 | |
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855 void ThreadSnapshot::metadata_do(void f(Metadata*)) { |
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856 if (_stack_trace != NULL) { |
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857 _stack_trace->metadata_do(f); |
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858 } |
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859 } |
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860 |
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861 |
0 | 862 DeadlockCycle::DeadlockCycle() { |
863 _is_deadlock = false; | |
6197 | 864 _threads = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true); |
0 | 865 _next = NULL; |
866 } | |
867 | |
868 DeadlockCycle::~DeadlockCycle() { | |
869 delete _threads; | |
870 } | |
871 | |
872 void DeadlockCycle::print_on(outputStream* st) const { | |
873 st->cr(); | |
874 st->print_cr("Found one Java-level deadlock:"); | |
875 st->print("============================="); | |
876 | |
877 JavaThread* currentThread; | |
878 ObjectMonitor* waitingToLockMonitor; | |
879 oop waitingToLockBlocker; | |
880 int len = _threads->length(); | |
881 for (int i = 0; i < len; i++) { | |
882 currentThread = _threads->at(i); | |
883 waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor(); | |
884 waitingToLockBlocker = currentThread->current_park_blocker(); | |
885 st->cr(); | |
886 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
887 const char* owner_desc = ",\n which is held by"; | |
888 if (waitingToLockMonitor != NULL) { | |
889 st->print(" waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor); | |
890 oop obj = (oop)waitingToLockMonitor->object(); | |
891 if (obj != NULL) { | |
892 st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj, | |
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893 (InstanceKlass::cast(obj->klass()))->external_name()); |
0 | 894 |
895 if (!currentThread->current_pending_monitor_is_from_java()) { | |
896 owner_desc = "\n in JNI, which is held by"; | |
897 } | |
898 } else { | |
899 // No Java object associated - a JVMTI raw monitor | |
900 owner_desc = " (JVMTI raw monitor),\n which is held by"; | |
901 } | |
902 currentThread = Threads::owning_thread_from_monitor_owner( | |
8673
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903 (address)waitingToLockMonitor->owner(), |
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904 false /* no locking needed */); |
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905 if (currentThread == NULL) { |
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906 // The deadlock was detected at a safepoint so the JavaThread |
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907 // that owns waitingToLockMonitor should be findable, but |
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908 // if it is not findable, then the previous currentThread is |
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909 // blocked permanently. |
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910 st->print("%s UNKNOWN_owner_addr=" PTR_FORMAT, owner_desc, |
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911 (address)waitingToLockMonitor->owner()); |
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912 continue; |
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913 } |
0 | 914 } else { |
915 st->print(" waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)", | |
916 (address)waitingToLockBlocker, | |
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917 (InstanceKlass::cast(waitingToLockBlocker->klass()))->external_name()); |
0 | 918 assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()), |
919 "Must be an AbstractOwnableSynchronizer"); | |
920 oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker); | |
921 currentThread = java_lang_Thread::thread(ownerObj); | |
922 } | |
923 st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name()); | |
924 } | |
925 | |
926 st->cr(); | |
927 st->cr(); | |
928 | |
929 // Print stack traces | |
930 bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace; | |
931 JavaMonitorsInStackTrace = true; | |
932 st->print_cr("Java stack information for the threads listed above:"); | |
933 st->print_cr("==================================================="); | |
934 for (int j = 0; j < len; j++) { | |
935 currentThread = _threads->at(j); | |
936 st->print_cr("\"%s\":", currentThread->get_thread_name()); | |
937 currentThread->print_stack_on(st); | |
938 } | |
939 JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace; | |
940 } | |
941 | |
942 ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread, | |
943 bool include_jvmti_agent_threads, | |
944 bool include_jni_attaching_threads) { | |
945 assert(cur_thread == Thread::current(), "Check current thread"); | |
946 | |
947 int init_size = ThreadService::get_live_thread_count(); | |
948 _threads_array = new GrowableArray<instanceHandle>(init_size); | |
949 | |
950 MutexLockerEx ml(Threads_lock); | |
951 | |
952 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
953 // skips JavaThreads in the process of exiting | |
954 // and also skips VM internal JavaThreads | |
955 // Threads in _thread_new or _thread_new_trans state are included. | |
956 // i.e. threads have been started but not yet running. | |
957 if (jt->threadObj() == NULL || | |
958 jt->is_exiting() || | |
959 !java_lang_Thread::is_alive(jt->threadObj()) || | |
960 jt->is_hidden_from_external_view()) { | |
961 continue; | |
962 } | |
963 | |
964 // skip agent threads | |
965 if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) { | |
966 continue; | |
967 } | |
968 | |
969 // skip jni threads in the process of attaching | |
4006 | 970 if (!include_jni_attaching_threads && jt->is_attaching_via_jni()) { |
0 | 971 continue; |
972 } | |
973 | |
974 instanceHandle h(cur_thread, (instanceOop) jt->threadObj()); | |
975 _threads_array->append(h); | |
976 } | |
977 } |