Mercurial > hg > truffle
annotate src/share/vm/runtime/vm_operations.cpp @ 1640:bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
Summary: fix MonitorInUseLists memory leak and MonitorBound now works
Reviewed-by: chrisphi, dice
author | acorn |
---|---|
date | Fri, 02 Jul 2010 17:23:43 -0400 |
parents | c18cbe5936b8 |
children | ce6848d0666d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2007, 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 |
c18cbe5936b8
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_vm_operations.cpp.incl" | |
27 | |
28 #define VM_OP_NAME_INITIALIZE(name) #name, | |
29 | |
30 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \ | |
31 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) }; | |
32 | |
33 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) { | |
34 _calling_thread = thread; | |
35 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
36 _priority = priority; | |
37 } | |
38 | |
39 | |
40 void VM_Operation::evaluate() { | |
41 ResourceMark rm; | |
42 if (TraceVMOperation) { | |
43 tty->print("["); | |
44 NOT_PRODUCT(print();) | |
45 } | |
46 doit(); | |
47 if (TraceVMOperation) { | |
48 tty->print_cr("]"); | |
49 } | |
50 } | |
51 | |
52 // Called by fatal error handler. | |
53 void VM_Operation::print_on_error(outputStream* st) const { | |
54 st->print("VM_Operation (" PTR_FORMAT "): ", this); | |
55 st->print("%s", name()); | |
56 | |
57 const char* mode; | |
58 switch(evaluation_mode()) { | |
59 case _safepoint : mode = "safepoint"; break; | |
60 case _no_safepoint : mode = "no safepoint"; break; | |
61 case _concurrent : mode = "concurrent"; break; | |
62 case _async_safepoint: mode = "async safepoint"; break; | |
63 default : mode = "unknown"; break; | |
64 } | |
65 st->print(", mode: %s", mode); | |
66 | |
67 if (calling_thread()) { | |
68 st->print(", requested by thread " PTR_FORMAT, calling_thread()); | |
69 } | |
70 } | |
71 | |
72 void VM_ThreadStop::doit() { | |
73 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
74 JavaThread* target = java_lang_Thread::thread(target_thread()); | |
75 // Note that this now allows multiple ThreadDeath exceptions to be | |
76 // thrown at a thread. | |
77 if (target != NULL) { | |
78 // the thread has run and is not already in the process of exiting | |
79 target->send_thread_stop(throwable()); | |
80 } | |
81 } | |
82 | |
83 void VM_Deoptimize::doit() { | |
84 // We do not want any GCs to happen while we are in the middle of this VM operation | |
85 ResourceMark rm; | |
86 DeoptimizationMarker dm; | |
87 | |
88 // Deoptimize all activations depending on marked nmethods | |
89 Deoptimization::deoptimize_dependents(); | |
90 | |
91 // Make the dependent methods zombies | |
92 CodeCache::make_marked_nmethods_zombies(); | |
93 } | |
94 | |
95 | |
96 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) { | |
97 _thread = thread; | |
98 _id = id; | |
99 } | |
100 | |
101 | |
102 void VM_DeoptimizeFrame::doit() { | |
103 Deoptimization::deoptimize_frame(_thread, _id); | |
104 } | |
105 | |
106 | |
107 #ifndef PRODUCT | |
108 | |
109 void VM_DeoptimizeAll::doit() { | |
110 DeoptimizationMarker dm; | |
111 // deoptimize all java threads in the system | |
112 if (DeoptimizeALot) { | |
113 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
114 if (thread->has_last_Java_frame()) { | |
115 thread->deoptimize(); | |
116 } | |
117 } | |
118 } else if (DeoptimizeRandom) { | |
119 | |
120 // Deoptimize some selected threads and frames | |
121 int tnum = os::random() & 0x3; | |
122 int fnum = os::random() & 0x3; | |
123 int tcount = 0; | |
124 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
125 if (thread->has_last_Java_frame()) { | |
126 if (tcount++ == tnum) { | |
127 tcount = 0; | |
128 int fcount = 0; | |
129 // Deoptimize some selected frames. | |
130 // Biased llocking wants a updated register map | |
131 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) { | |
132 if (fst.current()->can_be_deoptimized()) { | |
133 if (fcount++ == fnum) { | |
134 fcount = 0; | |
135 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map()); | |
136 } | |
137 } | |
138 } | |
139 } | |
140 } | |
141 } | |
142 } | |
143 } | |
144 | |
145 | |
146 void VM_ZombieAll::doit() { | |
147 JavaThread *thread = (JavaThread *)calling_thread(); | |
148 assert(thread->is_Java_thread(), "must be a Java thread"); | |
149 thread->make_zombies(); | |
150 } | |
151 | |
152 #endif // !PRODUCT | |
153 | |
1202 | 154 void VM_HandleFullCodeCache::doit() { |
155 NMethodSweeper::speculative_disconnect_nmethods(_is_full); | |
156 } | |
157 | |
0 | 158 void VM_Verify::doit() { |
159 Universe::verify(); | |
160 } | |
161 | |
162 bool VM_PrintThreads::doit_prologue() { | |
163 assert(Thread::current()->is_Java_thread(), "just checking"); | |
164 | |
165 // Make sure AbstractOwnableSynchronizer is loaded | |
166 if (JDK_Version::is_gte_jdk16x_version()) { | |
167 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
168 } | |
169 | |
170 // Get Heap_lock if concurrent locks will be dumped | |
171 if (_print_concurrent_locks) { | |
172 Heap_lock->lock(); | |
173 } | |
174 return true; | |
175 } | |
176 | |
177 void VM_PrintThreads::doit() { | |
178 Threads::print_on(_out, true, false, _print_concurrent_locks); | |
179 } | |
180 | |
181 void VM_PrintThreads::doit_epilogue() { | |
182 if (_print_concurrent_locks) { | |
183 // Release Heap_lock | |
184 Heap_lock->unlock(); | |
185 } | |
186 } | |
187 | |
188 void VM_PrintJNI::doit() { | |
189 JNIHandles::print_on(_out); | |
190 } | |
191 | |
192 VM_FindDeadlocks::~VM_FindDeadlocks() { | |
193 if (_deadlocks != NULL) { | |
194 DeadlockCycle* cycle = _deadlocks; | |
195 while (cycle != NULL) { | |
196 DeadlockCycle* d = cycle; | |
197 cycle = cycle->next(); | |
198 delete d; | |
199 } | |
200 } | |
201 } | |
202 | |
203 bool VM_FindDeadlocks::doit_prologue() { | |
204 assert(Thread::current()->is_Java_thread(), "just checking"); | |
205 | |
206 // Load AbstractOwnableSynchronizer class | |
207 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) { | |
208 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
209 } | |
210 | |
211 return true; | |
212 } | |
213 | |
214 void VM_FindDeadlocks::doit() { | |
215 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks); | |
216 if (_out != NULL) { | |
217 int num_deadlocks = 0; | |
218 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) { | |
219 num_deadlocks++; | |
220 cycle->print_on(_out); | |
221 } | |
222 | |
223 if (num_deadlocks == 1) { | |
224 _out->print_cr("\nFound 1 deadlock.\n"); | |
225 _out->flush(); | |
226 } else if (num_deadlocks > 1) { | |
227 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks); | |
228 _out->flush(); | |
229 } | |
230 } | |
231 } | |
232 | |
233 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
234 int max_depth, | |
235 bool with_locked_monitors, | |
236 bool with_locked_synchronizers) { | |
237 _result = result; | |
238 _num_threads = 0; // 0 indicates all threads | |
239 _threads = NULL; | |
240 _result = result; | |
241 _max_depth = max_depth; | |
242 _with_locked_monitors = with_locked_monitors; | |
243 _with_locked_synchronizers = with_locked_synchronizers; | |
244 } | |
245 | |
246 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
247 GrowableArray<instanceHandle>* threads, | |
248 int num_threads, | |
249 int max_depth, | |
250 bool with_locked_monitors, | |
251 bool with_locked_synchronizers) { | |
252 _result = result; | |
253 _num_threads = num_threads; | |
254 _threads = threads; | |
255 _result = result; | |
256 _max_depth = max_depth; | |
257 _with_locked_monitors = with_locked_monitors; | |
258 _with_locked_synchronizers = with_locked_synchronizers; | |
259 } | |
260 | |
261 bool VM_ThreadDump::doit_prologue() { | |
262 assert(Thread::current()->is_Java_thread(), "just checking"); | |
263 | |
264 // Load AbstractOwnableSynchronizer class before taking thread snapshots | |
265 if (JDK_Version::is_gte_jdk16x_version()) { | |
266 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
267 } | |
268 | |
269 if (_with_locked_synchronizers) { | |
270 // Acquire Heap_lock to dump concurrent locks | |
271 Heap_lock->lock(); | |
272 } | |
273 | |
274 return true; | |
275 } | |
276 | |
277 void VM_ThreadDump::doit_epilogue() { | |
278 if (_with_locked_synchronizers) { | |
279 // Release Heap_lock | |
280 Heap_lock->unlock(); | |
281 } | |
282 } | |
283 | |
284 void VM_ThreadDump::doit() { | |
285 ResourceMark rm; | |
286 | |
287 ConcurrentLocksDump concurrent_locks(true); | |
288 if (_with_locked_synchronizers) { | |
289 concurrent_locks.dump_at_safepoint(); | |
290 } | |
291 | |
292 if (_num_threads == 0) { | |
293 // Snapshot all live threads | |
294 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
295 if (jt->is_exiting() || | |
296 jt->is_hidden_from_external_view()) { | |
297 // skip terminating threads and hidden threads | |
298 continue; | |
299 } | |
300 ThreadConcurrentLocks* tcl = NULL; | |
301 if (_with_locked_synchronizers) { | |
302 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
303 } | |
304 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
305 _result->add_thread_snapshot(ts); | |
306 } | |
307 } else { | |
308 // Snapshot threads in the given _threads array | |
309 // A dummy snapshot is created if a thread doesn't exist | |
310 for (int i = 0; i < _num_threads; i++) { | |
311 instanceHandle th = _threads->at(i); | |
312 if (th() == NULL) { | |
313 // skip if the thread doesn't exist | |
314 // Add a dummy snapshot | |
315 _result->add_thread_snapshot(new ThreadSnapshot()); | |
316 continue; | |
317 } | |
318 | |
319 // Dump thread stack only if the thread is alive and not exiting | |
320 // and not VM internal thread. | |
321 JavaThread* jt = java_lang_Thread::thread(th()); | |
322 if (jt == NULL || /* thread not alive */ | |
323 jt->is_exiting() || | |
324 jt->is_hidden_from_external_view()) { | |
325 // add a NULL snapshot if skipped | |
326 _result->add_thread_snapshot(new ThreadSnapshot()); | |
327 continue; | |
328 } | |
329 ThreadConcurrentLocks* tcl = NULL; | |
330 if (_with_locked_synchronizers) { | |
331 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
332 } | |
333 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
334 _result->add_thread_snapshot(ts); | |
335 } | |
336 } | |
337 } | |
338 | |
339 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) { | |
340 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread); | |
341 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors); | |
342 snapshot->set_concurrent_locks(tcl); | |
343 return snapshot; | |
344 } | |
345 | |
346 volatile bool VM_Exit::_vm_exited = false; | |
347 Thread * VM_Exit::_shutdown_thread = NULL; | |
348 | |
349 int VM_Exit::set_vm_exited() { | |
350 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
351 | |
352 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
353 | |
354 int num_active = 0; | |
355 | |
356 _shutdown_thread = thr_cur; | |
357 _vm_exited = true; // global flag | |
358 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) | |
359 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
360 ++num_active; | |
361 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag | |
362 } | |
363 | |
364 return num_active; | |
365 } | |
366 | |
367 int VM_Exit::wait_for_threads_in_native_to_block() { | |
368 // VM exits at safepoint. This function must be called at the final safepoint | |
369 // to wait for threads in _thread_in_native state to be quiescent. | |
370 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
371 | |
372 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
373 Monitor timer(Mutex::leaf, "VM_Exit timer", true); | |
374 | |
375 // Compiler threads need longer wait because they can access VM data directly | |
376 // while in native. If they are active and some structures being used are | |
377 // deleted by the shutdown sequence, they will crash. On the other hand, user | |
378 // threads must go through native=>Java/VM transitions first to access VM | |
379 // data, and they will be stopped during state transition. In theory, we | |
380 // don't have to wait for user threads to be quiescent, but it's always | |
381 // better to terminate VM when current thread is the only active thread, so | |
382 // wait for user threads too. Numbers are in 10 milliseconds. | |
383 int max_wait_user_thread = 30; // at least 300 milliseconds | |
384 int max_wait_compiler_thread = 1000; // at least 10 seconds | |
385 | |
386 int max_wait = max_wait_compiler_thread; | |
387 | |
388 int attempts = 0; | |
389 while (true) { | |
390 int num_active = 0; | |
391 int num_active_compiler_thread = 0; | |
392 | |
393 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) { | |
394 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
395 num_active++; | |
396 if (thr->is_Compiler_thread()) { | |
397 num_active_compiler_thread++; | |
398 } | |
399 } | |
400 } | |
401 | |
402 if (num_active == 0) { | |
403 return 0; | |
404 } else if (attempts > max_wait) { | |
405 return num_active; | |
406 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) { | |
407 return num_active; | |
408 } | |
409 | |
410 attempts++; | |
411 | |
412 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag); | |
413 timer.wait(Mutex::_no_safepoint_check_flag, 10); | |
414 } | |
415 } | |
416 | |
417 void VM_Exit::doit() { | |
418 CompileBroker::set_should_block(); | |
419 | |
420 // Wait for a short period for threads in native to block. Any thread | |
421 // still executing native code after the wait will be stopped at | |
422 // native==>Java/VM barriers. | |
423 // Among 16276 JCK tests, 94% of them come here without any threads still | |
424 // running in native; the other 6% are quiescent within 250ms (Ultra 80). | |
425 wait_for_threads_in_native_to_block(); | |
426 | |
427 set_vm_exited(); | |
428 | |
429 // cleanup globals resources before exiting. exit_globals() currently | |
430 // cleans up outputStream resources and PerfMemory resources. | |
431 exit_globals(); | |
432 | |
433 // Check for exit hook | |
434 exit_hook_t exit_hook = Arguments::exit_hook(); | |
435 if (exit_hook != NULL) { | |
436 // exit hook should exit. | |
437 exit_hook(_exit_code); | |
438 // ... but if it didn't, we must do it here | |
439 vm_direct_exit(_exit_code); | |
440 } else { | |
441 vm_direct_exit(_exit_code); | |
442 } | |
443 } | |
444 | |
445 | |
446 void VM_Exit::wait_if_vm_exited() { | |
447 if (_vm_exited && | |
448 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) { | |
449 // _vm_exited is set at safepoint, and the Threads_lock is never released | |
450 // we will block here until the process dies | |
451 Threads_lock->lock_without_safepoint_check(); | |
452 ShouldNotReachHere(); | |
453 } | |
454 } |