Mercurial > hg > truffle
annotate src/share/vm/runtime/safepoint.cpp @ 5131:e307e8104e12
fix for non-graal builds
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 21 Mar 2012 11:57:57 +0100 |
parents | 0ebca2e35ca5 |
children | 957c266d8bc5 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 "code/codeCache.hpp" | |
28 #include "code/icBuffer.hpp" | |
29 #include "code/nmethod.hpp" | |
30 #include "code/pcDesc.hpp" | |
31 #include "code/scopeDesc.hpp" | |
32 #include "gc_interface/collectedHeap.hpp" | |
33 #include "interpreter/interpreter.hpp" | |
34 #include "memory/resourceArea.hpp" | |
35 #include "memory/universe.inline.hpp" | |
36 #include "oops/oop.inline.hpp" | |
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37 #include "oops/symbol.hpp" |
1972 | 38 #include "runtime/compilationPolicy.hpp" |
39 #include "runtime/deoptimization.hpp" | |
40 #include "runtime/frame.inline.hpp" | |
41 #include "runtime/interfaceSupport.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "runtime/osThread.hpp" | |
44 #include "runtime/safepoint.hpp" | |
45 #include "runtime/signature.hpp" | |
46 #include "runtime/stubCodeGenerator.hpp" | |
47 #include "runtime/stubRoutines.hpp" | |
48 #include "runtime/sweeper.hpp" | |
49 #include "runtime/synchronizer.hpp" | |
50 #include "services/runtimeService.hpp" | |
51 #include "utilities/events.hpp" | |
52 #ifdef TARGET_ARCH_x86 | |
53 # include "nativeInst_x86.hpp" | |
54 # include "vmreg_x86.inline.hpp" | |
55 #endif | |
56 #ifdef TARGET_ARCH_sparc | |
57 # include "nativeInst_sparc.hpp" | |
58 # include "vmreg_sparc.inline.hpp" | |
59 #endif | |
60 #ifdef TARGET_ARCH_zero | |
61 # include "nativeInst_zero.hpp" | |
62 # include "vmreg_zero.inline.hpp" | |
63 #endif | |
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64 #ifdef TARGET_ARCH_arm |
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65 # include "nativeInst_arm.hpp" |
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66 # include "vmreg_arm.inline.hpp" |
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67 #endif |
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68 #ifdef TARGET_ARCH_ppc |
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69 # include "nativeInst_ppc.hpp" |
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70 # include "vmreg_ppc.inline.hpp" |
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71 #endif |
1972 | 72 #ifdef TARGET_OS_FAMILY_linux |
73 # include "thread_linux.inline.hpp" | |
74 #endif | |
75 #ifdef TARGET_OS_FAMILY_solaris | |
76 # include "thread_solaris.inline.hpp" | |
77 #endif | |
78 #ifdef TARGET_OS_FAMILY_windows | |
79 # include "thread_windows.inline.hpp" | |
80 #endif | |
3960 | 81 #ifdef TARGET_OS_FAMILY_bsd |
82 # include "thread_bsd.inline.hpp" | |
83 #endif | |
1972 | 84 #ifndef SERIALGC |
85 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
86 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
87 #endif | |
88 #ifdef COMPILER1 | |
89 #include "c1/c1_globals.hpp" | |
90 #endif | |
0 | 91 |
92 // -------------------------------------------------------------------------------------------------- | |
93 // Implementation of Safepoint begin/end | |
94 | |
95 SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized; | |
96 volatile int SafepointSynchronize::_waiting_to_block = 0; | |
97 volatile int SafepointSynchronize::_safepoint_counter = 0; | |
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98 int SafepointSynchronize::_current_jni_active_count = 0; |
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99 long SafepointSynchronize::_end_of_last_safepoint = 0; |
0 | 100 static volatile int PageArmed = 0 ; // safepoint polling page is RO|RW vs PROT_NONE |
101 static volatile int TryingToBlock = 0 ; // proximate value -- for advisory use only | |
102 static bool timeout_error_printed = false; | |
103 | |
104 // Roll all threads forward to a safepoint and suspend them all | |
105 void SafepointSynchronize::begin() { | |
106 | |
107 Thread* myThread = Thread::current(); | |
108 assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint"); | |
109 | |
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110 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { |
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111 _safepoint_begin_time = os::javaTimeNanos(); |
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112 _ts_of_current_safepoint = tty->time_stamp().seconds(); |
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113 } |
0 | 114 |
115 #ifndef SERIALGC | |
116 if (UseConcMarkSweepGC) { | |
117 // In the future we should investigate whether CMS can use the | |
118 // more-general mechanism below. DLD (01/05). | |
119 ConcurrentMarkSweepThread::synchronize(false); | |
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120 } else if (UseG1GC) { |
0 | 121 ConcurrentGCThread::safepoint_synchronize(); |
122 } | |
123 #endif // SERIALGC | |
124 | |
125 // By getting the Threads_lock, we assure that no threads are about to start or | |
126 // exit. It is released again in SafepointSynchronize::end(). | |
127 Threads_lock->lock(); | |
128 | |
129 assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state"); | |
130 | |
131 int nof_threads = Threads::number_of_threads(); | |
132 | |
133 if (TraceSafepoint) { | |
134 tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads); | |
135 } | |
136 | |
137 RuntimeService::record_safepoint_begin(); | |
138 | |
139 MutexLocker mu(Safepoint_lock); | |
140 | |
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141 // Reset the count of active JNI critical threads |
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142 _current_jni_active_count = 0; |
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143 |
0 | 144 // Set number of threads to wait for, before we initiate the callbacks |
145 _waiting_to_block = nof_threads; | |
146 TryingToBlock = 0 ; | |
147 int still_running = nof_threads; | |
148 | |
149 // Save the starting time, so that it can be compared to see if this has taken | |
150 // too long to complete. | |
151 jlong safepoint_limit_time; | |
152 timeout_error_printed = false; | |
153 | |
1003 | 154 // PrintSafepointStatisticsTimeout can be specified separately. When |
155 // specified, PrintSafepointStatistics will be set to true in | |
156 // deferred_initialize_stat method. The initialization has to be done | |
157 // early enough to avoid any races. See bug 6880029 for details. | |
158 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { | |
159 deferred_initialize_stat(); | |
160 } | |
161 | |
0 | 162 // Begin the process of bringing the system to a safepoint. |
163 // Java threads can be in several different states and are | |
164 // stopped by different mechanisms: | |
165 // | |
166 // 1. Running interpreted | |
167 // The interpeter dispatch table is changed to force it to | |
168 // check for a safepoint condition between bytecodes. | |
169 // 2. Running in native code | |
170 // When returning from the native code, a Java thread must check | |
171 // the safepoint _state to see if we must block. If the | |
172 // VM thread sees a Java thread in native, it does | |
173 // not wait for this thread to block. The order of the memory | |
174 // writes and reads of both the safepoint state and the Java | |
175 // threads state is critical. In order to guarantee that the | |
176 // memory writes are serialized with respect to each other, | |
177 // the VM thread issues a memory barrier instruction | |
178 // (on MP systems). In order to avoid the overhead of issuing | |
179 // a memory barrier for each Java thread making native calls, each Java | |
180 // thread performs a write to a single memory page after changing | |
181 // the thread state. The VM thread performs a sequence of | |
182 // mprotect OS calls which forces all previous writes from all | |
183 // Java threads to be serialized. This is done in the | |
184 // os::serialize_thread_states() call. This has proven to be | |
185 // much more efficient than executing a membar instruction | |
186 // on every call to native code. | |
187 // 3. Running compiled Code | |
188 // Compiled code reads a global (Safepoint Polling) page that | |
189 // is set to fault if we are trying to get to a safepoint. | |
190 // 4. Blocked | |
191 // A thread which is blocked will not be allowed to return from the | |
192 // block condition until the safepoint operation is complete. | |
193 // 5. In VM or Transitioning between states | |
194 // If a Java thread is currently running in the VM or transitioning | |
195 // between states, the safepointing code will wait for the thread to | |
196 // block itself when it attempts transitions to a new state. | |
197 // | |
198 _state = _synchronizing; | |
199 OrderAccess::fence(); | |
200 | |
201 // Flush all thread states to memory | |
202 if (!UseMembar) { | |
203 os::serialize_thread_states(); | |
204 } | |
205 | |
206 // Make interpreter safepoint aware | |
207 Interpreter::notice_safepoints(); | |
208 | |
209 if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) { | |
210 // Make polling safepoint aware | |
211 guarantee (PageArmed == 0, "invariant") ; | |
212 PageArmed = 1 ; | |
213 os::make_polling_page_unreadable(); | |
214 } | |
215 | |
216 // Consider using active_processor_count() ... but that call is expensive. | |
217 int ncpus = os::processor_count() ; | |
218 | |
219 #ifdef ASSERT | |
220 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
221 assert(cur->safepoint_state()->is_running(), "Illegal initial state"); | |
222 } | |
223 #endif // ASSERT | |
224 | |
225 if (SafepointTimeout) | |
226 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS; | |
227 | |
228 // Iterate through all threads until it have been determined how to stop them all at a safepoint | |
229 unsigned int iterations = 0; | |
230 int steps = 0 ; | |
231 while(still_running > 0) { | |
232 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
233 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended"); | |
234 ThreadSafepointState *cur_state = cur->safepoint_state(); | |
235 if (cur_state->is_running()) { | |
236 cur_state->examine_state_of_thread(); | |
237 if (!cur_state->is_running()) { | |
238 still_running--; | |
239 // consider adjusting steps downward: | |
240 // steps = 0 | |
241 // steps -= NNN | |
242 // steps >>= 1 | |
243 // steps = MIN(steps, 2000-100) | |
244 // if (iterations != 0) steps -= NNN | |
245 } | |
246 if (TraceSafepoint && Verbose) cur_state->print(); | |
247 } | |
248 } | |
249 | |
1003 | 250 if (PrintSafepointStatistics && iterations == 0) { |
0 | 251 begin_statistics(nof_threads, still_running); |
252 } | |
253 | |
254 if (still_running > 0) { | |
255 // Check for if it takes to long | |
256 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) { | |
257 print_safepoint_timeout(_spinning_timeout); | |
258 } | |
259 | |
260 // Spin to avoid context switching. | |
261 // There's a tension between allowing the mutators to run (and rendezvous) | |
262 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that | |
263 // a mutator might otherwise use profitably to reach a safepoint. Excessive | |
264 // spinning by the VM thread on a saturated system can increase rendezvous latency. | |
265 // Blocking or yielding incur their own penalties in the form of context switching | |
266 // and the resultant loss of $ residency. | |
267 // | |
268 // Further complicating matters is that yield() does not work as naively expected | |
269 // on many platforms -- yield() does not guarantee that any other ready threads | |
270 // will run. As such we revert yield_all() after some number of iterations. | |
271 // Yield_all() is implemented as a short unconditional sleep on some platforms. | |
272 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping | |
273 // can actually increase the time it takes the VM thread to detect that a system-wide | |
274 // stop-the-world safepoint has been reached. In a pathological scenario such as that | |
275 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe. | |
276 // In that case the mutators will be stalled waiting for the safepoint to complete and the | |
277 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread | |
278 // will eventually wake up and detect that all mutators are safe, at which point | |
279 // we'll again make progress. | |
280 // | |
281 // Beware too that that the VMThread typically runs at elevated priority. | |
282 // Its default priority is higher than the default mutator priority. | |
283 // Obviously, this complicates spinning. | |
284 // | |
285 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0). | |
286 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will. | |
287 // | |
288 // See the comments in synchronizer.cpp for additional remarks on spinning. | |
289 // | |
290 // In the future we might: | |
291 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning. | |
292 // This is tricky as the path used by a thread exiting the JVM (say on | |
293 // on JNI call-out) simply stores into its state field. The burden | |
294 // is placed on the VM thread, which must poll (spin). | |
295 // 2. Find something useful to do while spinning. If the safepoint is GC-related | |
296 // we might aggressively scan the stacks of threads that are already safe. | |
297 // 3. Use Solaris schedctl to examine the state of the still-running mutators. | |
298 // If all the mutators are ONPROC there's no reason to sleep or yield. | |
299 // 4. YieldTo() any still-running mutators that are ready but OFFPROC. | |
300 // 5. Check system saturation. If the system is not fully saturated then | |
301 // simply spin and avoid sleep/yield. | |
302 // 6. As still-running mutators rendezvous they could unpark the sleeping | |
303 // VMthread. This works well for still-running mutators that become | |
304 // safe. The VMthread must still poll for mutators that call-out. | |
305 // 7. Drive the policy on time-since-begin instead of iterations. | |
306 // 8. Consider making the spin duration a function of the # of CPUs: | |
307 // Spin = (((ncpus-1) * M) + K) + F(still_running) | |
308 // Alternately, instead of counting iterations of the outer loop | |
309 // we could count the # of threads visited in the inner loop, above. | |
310 // 9. On windows consider using the return value from SwitchThreadTo() | |
311 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions. | |
312 | |
313 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) { | |
314 guarantee (PageArmed == 0, "invariant") ; | |
315 PageArmed = 1 ; | |
316 os::make_polling_page_unreadable(); | |
317 } | |
318 | |
319 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or | |
320 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus) | |
321 ++steps ; | |
322 if (ncpus > 1 && steps < SafepointSpinBeforeYield) { | |
323 SpinPause() ; // MP-Polite spin | |
324 } else | |
325 if (steps < DeferThrSuspendLoopCount) { | |
326 os::NakedYield() ; | |
327 } else { | |
328 os::yield_all(steps) ; | |
329 // Alternately, the VM thread could transiently depress its scheduling priority or | |
330 // transiently increase the priority of the tardy mutator(s). | |
331 } | |
332 | |
333 iterations ++ ; | |
334 } | |
335 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long"); | |
336 } | |
337 assert(still_running == 0, "sanity check"); | |
338 | |
339 if (PrintSafepointStatistics) { | |
340 update_statistics_on_spin_end(); | |
341 } | |
342 | |
343 // wait until all threads are stopped | |
344 while (_waiting_to_block > 0) { | |
345 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block); | |
346 if (!SafepointTimeout || timeout_error_printed) { | |
347 Safepoint_lock->wait(true); // true, means with no safepoint checks | |
348 } else { | |
349 // Compute remaining time | |
350 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos(); | |
351 | |
352 // If there is no remaining time, then there is an error | |
353 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) { | |
354 print_safepoint_timeout(_blocking_timeout); | |
355 } | |
356 } | |
357 } | |
358 assert(_waiting_to_block == 0, "sanity check"); | |
359 | |
360 #ifndef PRODUCT | |
361 if (SafepointTimeout) { | |
362 jlong current_time = os::javaTimeNanos(); | |
363 if (safepoint_limit_time < current_time) { | |
364 tty->print_cr("# SafepointSynchronize: Finished after " | |
365 INT64_FORMAT_W(6) " ms", | |
366 ((current_time - safepoint_limit_time) / MICROUNITS + | |
367 SafepointTimeoutDelay)); | |
368 } | |
369 } | |
370 #endif | |
371 | |
372 assert((_safepoint_counter & 0x1) == 0, "must be even"); | |
373 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
374 _safepoint_counter ++; | |
375 | |
376 // Record state | |
377 _state = _synchronized; | |
378 | |
379 OrderAccess::fence(); | |
380 | |
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381 // Update the count of active JNI critical regions |
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382 GC_locker::set_jni_lock_count(_current_jni_active_count); |
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383 |
0 | 384 if (TraceSafepoint) { |
385 VM_Operation *op = VMThread::vm_operation(); | |
386 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation"); | |
387 } | |
388 | |
389 RuntimeService::record_safepoint_synchronized(); | |
390 if (PrintSafepointStatistics) { | |
391 update_statistics_on_sync_end(os::javaTimeNanos()); | |
392 } | |
393 | |
394 // Call stuff that needs to be run when a safepoint is just about to be completed | |
395 do_cleanup_tasks(); | |
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396 |
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397 if (PrintSafepointStatistics) { |
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398 // Record how much time spend on the above cleanup tasks |
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399 update_statistics_on_cleanup_end(os::javaTimeNanos()); |
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400 } |
0 | 401 } |
402 | |
403 // Wake up all threads, so they are ready to resume execution after the safepoint | |
404 // operation has been carried out | |
405 void SafepointSynchronize::end() { | |
406 | |
407 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
408 assert((_safepoint_counter & 0x1) == 1, "must be odd"); | |
409 _safepoint_counter ++; | |
410 // memory fence isn't required here since an odd _safepoint_counter | |
411 // value can do no harm and a fence is issued below anyway. | |
412 | |
413 DEBUG_ONLY(Thread* myThread = Thread::current();) | |
414 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint"); | |
415 | |
416 if (PrintSafepointStatistics) { | |
417 end_statistics(os::javaTimeNanos()); | |
418 } | |
419 | |
420 #ifdef ASSERT | |
421 // A pending_exception cannot be installed during a safepoint. The threads | |
422 // may install an async exception after they come back from a safepoint into | |
423 // pending_exception after they unblock. But that should happen later. | |
424 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
425 assert (!(cur->has_pending_exception() && | |
426 cur->safepoint_state()->is_at_poll_safepoint()), | |
427 "safepoint installed a pending exception"); | |
428 } | |
429 #endif // ASSERT | |
430 | |
431 if (PageArmed) { | |
432 // Make polling safepoint aware | |
433 os::make_polling_page_readable(); | |
434 PageArmed = 0 ; | |
435 } | |
436 | |
437 // Remove safepoint check from interpreter | |
438 Interpreter::ignore_safepoints(); | |
439 | |
440 { | |
441 MutexLocker mu(Safepoint_lock); | |
442 | |
443 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization"); | |
444 | |
445 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method | |
446 // when they get restarted. | |
447 _state = _not_synchronized; | |
448 OrderAccess::fence(); | |
449 | |
450 if (TraceSafepoint) { | |
451 tty->print_cr("Leaving safepoint region"); | |
452 } | |
453 | |
454 // Start suspended threads | |
455 for(JavaThread *current = Threads::first(); current; current = current->next()) { | |
605 | 456 // A problem occurring on Solaris is when attempting to restart threads |
0 | 457 // the first #cpus - 1 go well, but then the VMThread is preempted when we get |
458 // to the next one (since it has been running the longest). We then have | |
459 // to wait for a cpu to become available before we can continue restarting | |
460 // threads. | |
461 // FIXME: This causes the performance of the VM to degrade when active and with | |
462 // large numbers of threads. Apparently this is due to the synchronous nature | |
463 // of suspending threads. | |
464 // | |
465 // TODO-FIXME: the comments above are vestigial and no longer apply. | |
466 // Furthermore, using solaris' schedctl in this particular context confers no benefit | |
467 if (VMThreadHintNoPreempt) { | |
468 os::hint_no_preempt(); | |
469 } | |
470 ThreadSafepointState* cur_state = current->safepoint_state(); | |
471 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint"); | |
472 cur_state->restart(); | |
473 assert(cur_state->is_running(), "safepoint state has not been reset"); | |
474 } | |
475 | |
476 RuntimeService::record_safepoint_end(); | |
477 | |
478 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads | |
479 // blocked in signal_thread_blocked | |
480 Threads_lock->unlock(); | |
481 | |
482 } | |
483 #ifndef SERIALGC | |
484 // If there are any concurrent GC threads resume them. | |
485 if (UseConcMarkSweepGC) { | |
486 ConcurrentMarkSweepThread::desynchronize(false); | |
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487 } else if (UseG1GC) { |
0 | 488 ConcurrentGCThread::safepoint_desynchronize(); |
489 } | |
490 #endif // SERIALGC | |
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491 // record this time so VMThread can keep track how much time has elasped |
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492 // since last safepoint. |
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493 _end_of_last_safepoint = os::javaTimeMillis(); |
0 | 494 } |
495 | |
496 bool SafepointSynchronize::is_cleanup_needed() { | |
497 // Need a safepoint if some inline cache buffers is non-empty | |
498 if (!InlineCacheBuffer::is_empty()) return true; | |
499 return false; | |
500 } | |
501 | |
502 | |
503 | |
504 // Various cleaning tasks that should be done periodically at safepoints | |
505 void SafepointSynchronize::do_cleanup_tasks() { | |
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506 { |
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507 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); |
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508 ObjectSynchronizer::deflate_idle_monitors(); |
0 | 509 } |
510 | |
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511 { |
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512 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); |
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513 InlineCacheBuffer::update_inline_caches(); |
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514 } |
1783 | 515 { |
516 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime); | |
517 CompilationPolicy::policy()->do_safepoint_work(); | |
0 | 518 } |
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519 |
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520 TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime); |
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521 NMethodSweeper::scan_stacks(); |
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522 |
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523 // rotate log files? |
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524 if (UseGCLogFileRotation) { |
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525 gclog_or_tty->rotate_log(); |
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526 } |
0 | 527 } |
528 | |
529 | |
530 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) { | |
531 switch(state) { | |
532 case _thread_in_native: | |
533 // native threads are safe if they have no java stack or have walkable stack | |
534 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable(); | |
535 | |
536 // blocked threads should have already have walkable stack | |
537 case _thread_blocked: | |
538 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable"); | |
539 return true; | |
540 | |
541 default: | |
542 return false; | |
543 } | |
544 } | |
545 | |
546 | |
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547 // See if the thread is running inside a lazy critical native and |
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548 // update the thread critical count if so. Also set a suspend flag to |
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549 // cause the native wrapper to return into the JVM to do the unlock |
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550 // once the native finishes. |
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551 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) { |
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552 if (state == _thread_in_native && |
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553 thread->has_last_Java_frame() && |
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554 thread->frame_anchor()->walkable()) { |
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555 // This thread might be in a critical native nmethod so look at |
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556 // the top of the stack and increment the critical count if it |
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557 // is. |
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558 frame wrapper_frame = thread->last_frame(); |
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559 CodeBlob* stub_cb = wrapper_frame.cb(); |
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560 if (stub_cb != NULL && |
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561 stub_cb->is_nmethod() && |
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562 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) { |
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563 // A thread could potentially be in a critical native across |
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564 // more than one safepoint, so only update the critical state on |
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565 // the first one. When it returns it will perform the unlock. |
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566 if (!thread->do_critical_native_unlock()) { |
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567 #ifdef ASSERT |
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568 if (!thread->in_critical()) { |
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569 GC_locker::increment_debug_jni_lock_count(); |
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570 } |
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571 #endif |
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572 thread->enter_critical(); |
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573 // Make sure the native wrapper calls back on return to |
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574 // perform the needed critical unlock. |
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575 thread->set_critical_native_unlock(); |
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576 } |
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577 } |
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578 } |
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579 } |
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580 |
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581 |
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582 |
0 | 583 // ------------------------------------------------------------------------------------------------------- |
584 // Implementation of Safepoint callback point | |
585 | |
586 void SafepointSynchronize::block(JavaThread *thread) { | |
587 assert(thread != NULL, "thread must be set"); | |
588 assert(thread->is_Java_thread(), "not a Java thread"); | |
589 | |
590 // Threads shouldn't block if they are in the middle of printing, but... | |
591 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id()); | |
592 | |
593 // Only bail from the block() call if the thread is gone from the | |
594 // thread list; starting to exit should still block. | |
595 if (thread->is_terminated()) { | |
596 // block current thread if we come here from native code when VM is gone | |
597 thread->block_if_vm_exited(); | |
598 | |
599 // otherwise do nothing | |
600 return; | |
601 } | |
602 | |
603 JavaThreadState state = thread->thread_state(); | |
604 thread->frame_anchor()->make_walkable(thread); | |
605 | |
606 // Check that we have a valid thread_state at this point | |
607 switch(state) { | |
608 case _thread_in_vm_trans: | |
609 case _thread_in_Java: // From compiled code | |
610 | |
611 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case, | |
612 // we pretend we are still in the VM. | |
613 thread->set_thread_state(_thread_in_vm); | |
614 | |
615 if (is_synchronizing()) { | |
616 Atomic::inc (&TryingToBlock) ; | |
617 } | |
618 | |
619 // We will always be holding the Safepoint_lock when we are examine the state | |
620 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and | |
621 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code | |
622 Safepoint_lock->lock_without_safepoint_check(); | |
623 if (is_synchronizing()) { | |
624 // Decrement the number of threads to wait for and signal vm thread | |
625 assert(_waiting_to_block > 0, "sanity check"); | |
626 _waiting_to_block--; | |
627 thread->safepoint_state()->set_has_called_back(true); | |
628 | |
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629 if (thread->in_critical()) { |
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630 // Notice that this thread is in a critical section |
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631 increment_jni_active_count(); |
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632 } |
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633 |
0 | 634 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread |
635 if (_waiting_to_block == 0) { | |
636 Safepoint_lock->notify_all(); | |
637 } | |
638 } | |
639 | |
640 // We transition the thread to state _thread_blocked here, but | |
641 // we can't do our usual check for external suspension and then | |
642 // self-suspend after the lock_without_safepoint_check() call | |
643 // below because we are often called during transitions while | |
644 // we hold different locks. That would leave us suspended while | |
645 // holding a resource which results in deadlocks. | |
646 thread->set_thread_state(_thread_blocked); | |
647 Safepoint_lock->unlock(); | |
648 | |
649 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during | |
650 // the entire safepoint, the threads will all line up here during the safepoint. | |
651 Threads_lock->lock_without_safepoint_check(); | |
652 // restore original state. This is important if the thread comes from compiled code, so it | |
653 // will continue to execute with the _thread_in_Java state. | |
654 thread->set_thread_state(state); | |
655 Threads_lock->unlock(); | |
656 break; | |
657 | |
658 case _thread_in_native_trans: | |
659 case _thread_blocked_trans: | |
660 case _thread_new_trans: | |
661 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) { | |
662 thread->print_thread_state(); | |
663 fatal("Deadlock in safepoint code. " | |
664 "Should have called back to the VM before blocking."); | |
665 } | |
666 | |
667 // We transition the thread to state _thread_blocked here, but | |
668 // we can't do our usual check for external suspension and then | |
669 // self-suspend after the lock_without_safepoint_check() call | |
670 // below because we are often called during transitions while | |
671 // we hold different locks. That would leave us suspended while | |
672 // holding a resource which results in deadlocks. | |
673 thread->set_thread_state(_thread_blocked); | |
674 | |
675 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence, | |
676 // the safepoint code might still be waiting for it to block. We need to change the state here, | |
677 // so it can see that it is at a safepoint. | |
678 | |
679 // Block until the safepoint operation is completed. | |
680 Threads_lock->lock_without_safepoint_check(); | |
681 | |
682 // Restore state | |
683 thread->set_thread_state(state); | |
684 | |
685 Threads_lock->unlock(); | |
686 break; | |
687 | |
688 default: | |
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689 fatal(err_msg("Illegal threadstate encountered: %d", state)); |
0 | 690 } |
691 | |
692 // Check for pending. async. exceptions or suspends - except if the | |
693 // thread was blocked inside the VM. has_special_runtime_exit_condition() | |
694 // is called last since it grabs a lock and we only want to do that when | |
695 // we must. | |
696 // | |
697 // Note: we never deliver an async exception at a polling point as the | |
698 // compiler may not have an exception handler for it. The polling | |
699 // code will notice the async and deoptimize and the exception will | |
700 // be delivered. (Polling at a return point is ok though). Sure is | |
701 // a lot of bother for a deprecated feature... | |
702 // | |
703 // We don't deliver an async exception if the thread state is | |
704 // _thread_in_native_trans so JNI functions won't be called with | |
705 // a surprising pending exception. If the thread state is going back to java, | |
706 // async exception is checked in check_special_condition_for_native_trans(). | |
707 | |
708 if (state != _thread_blocked_trans && | |
709 state != _thread_in_vm_trans && | |
710 thread->has_special_runtime_exit_condition()) { | |
711 thread->handle_special_runtime_exit_condition( | |
712 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans)); | |
713 } | |
714 } | |
715 | |
716 // ------------------------------------------------------------------------------------------------------ | |
717 // Exception handlers | |
718 | |
719 #ifndef PRODUCT | |
720 #ifdef _LP64 | |
721 #define PTR_PAD "" | |
722 #else | |
723 #define PTR_PAD " " | |
724 #endif | |
725 | |
726 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) { | |
727 bool is_oop = newptr ? ((oop)newptr)->is_oop() : false; | |
728 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s", | |
729 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
730 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
731 } | |
732 | |
733 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) { | |
734 bool is_oop = newptr ? ((oop)(intptr_t)newptr)->is_oop() : false; | |
735 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s", | |
736 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
737 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
738 } | |
739 | |
740 #ifdef SPARC | |
741 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) { | |
742 #ifdef _LP64 | |
743 tty->print_cr("--------+------address-----+------before-----------+-------after----------+"); | |
744 const int incr = 1; // Increment to skip a long, in units of intptr_t | |
745 #else | |
746 tty->print_cr("--------+--address-+------before-----------+-------after----------+"); | |
747 const int incr = 2; // Increment to skip a long, in units of intptr_t | |
748 #endif | |
749 tty->print_cr("---SP---|"); | |
750 for( int i=0; i<16; i++ ) { | |
751 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
752 tty->print_cr("--------|"); | |
753 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) { | |
754 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
755 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); | |
756 tty->print_cr("--------|"); | |
757 tty->print(" G1 |"PTR_FORMAT" ",new_sp); print_longs(*(jlong*)old_sp,*(jlong*)new_sp,was_oops[incr-1]); old_sp += incr; new_sp += incr; was_oops += incr; | |
758 tty->print(" G3 |"PTR_FORMAT" ",new_sp); print_longs(*(jlong*)old_sp,*(jlong*)new_sp,was_oops[incr-1]); old_sp += incr; new_sp += incr; was_oops += incr; | |
759 tty->print(" G4 |"PTR_FORMAT" ",new_sp); print_longs(*(jlong*)old_sp,*(jlong*)new_sp,was_oops[incr-1]); old_sp += incr; new_sp += incr; was_oops += incr; | |
760 tty->print(" G5 |"PTR_FORMAT" ",new_sp); print_longs(*(jlong*)old_sp,*(jlong*)new_sp,was_oops[incr-1]); old_sp += incr; new_sp += incr; was_oops += incr; | |
761 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp); | |
762 old_sp += incr; new_sp += incr; was_oops += incr; | |
763 // Skip the floats | |
764 tty->print_cr("--Float-|"PTR_FORMAT,new_sp); | |
765 tty->print_cr("---FP---|"); | |
766 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32; | |
767 for( int i2=0; i2<16; i2++ ) { | |
768 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
769 tty->print_cr(""); | |
770 } | |
771 #endif // SPARC | |
772 #endif // PRODUCT | |
773 | |
774 | |
775 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { | |
776 assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); | |
777 assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); | |
778 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization"); | |
779 | |
780 // Uncomment this to get some serious before/after printing of the | |
781 // Sparc safepoint-blob frame structure. | |
782 /* | |
783 intptr_t* sp = thread->last_Java_sp(); | |
784 intptr_t stack_copy[150]; | |
785 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i]; | |
786 bool was_oops[150]; | |
787 for( int i=0; i<150; i++ ) | |
788 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false; | |
789 */ | |
790 | |
791 if (ShowSafepointMsgs) { | |
792 tty->print("handle_polling_page_exception: "); | |
793 } | |
794 | |
795 if (PrintSafepointStatistics) { | |
796 inc_page_trap_count(); | |
797 } | |
798 | |
799 ThreadSafepointState* state = thread->safepoint_state(); | |
800 | |
801 state->handle_polling_page_exception(); | |
802 // print_me(sp,stack_copy,was_oops); | |
803 } | |
804 | |
805 | |
806 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) { | |
807 if (!timeout_error_printed) { | |
808 timeout_error_printed = true; | |
809 // Print out the thread infor which didn't reach the safepoint for debugging | |
810 // purposes (useful when there are lots of threads in the debugger). | |
811 tty->print_cr(""); | |
812 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:"); | |
813 if (reason == _spinning_timeout) { | |
814 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint."); | |
815 } else if (reason == _blocking_timeout) { | |
816 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop."); | |
817 } | |
818 | |
819 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:"); | |
820 ThreadSafepointState *cur_state; | |
821 ResourceMark rm; | |
822 for(JavaThread *cur_thread = Threads::first(); cur_thread; | |
823 cur_thread = cur_thread->next()) { | |
824 cur_state = cur_thread->safepoint_state(); | |
825 | |
826 if (cur_thread->thread_state() != _thread_blocked && | |
827 ((reason == _spinning_timeout && cur_state->is_running()) || | |
828 (reason == _blocking_timeout && !cur_state->has_called_back()))) { | |
829 tty->print("# "); | |
830 cur_thread->print(); | |
831 tty->print_cr(""); | |
832 } | |
833 } | |
834 tty->print_cr("# SafepointSynchronize::begin: (End of list)"); | |
835 } | |
836 | |
837 // To debug the long safepoint, specify both DieOnSafepointTimeout & | |
838 // ShowMessageBoxOnError. | |
839 if (DieOnSafepointTimeout) { | |
840 char msg[1024]; | |
841 VM_Operation *op = VMThread::vm_operation(); | |
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842 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.", |
0 | 843 SafepointTimeoutDelay, |
844 op != NULL ? op->name() : "no vm operation"); | |
845 fatal(msg); | |
846 } | |
847 } | |
848 | |
849 | |
850 // ------------------------------------------------------------------------------------------------------- | |
851 // Implementation of ThreadSafepointState | |
852 | |
853 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) { | |
854 _thread = thread; | |
855 _type = _running; | |
856 _has_called_back = false; | |
857 _at_poll_safepoint = false; | |
858 } | |
859 | |
860 void ThreadSafepointState::create(JavaThread *thread) { | |
861 ThreadSafepointState *state = new ThreadSafepointState(thread); | |
862 thread->set_safepoint_state(state); | |
863 } | |
864 | |
865 void ThreadSafepointState::destroy(JavaThread *thread) { | |
866 if (thread->safepoint_state()) { | |
867 delete(thread->safepoint_state()); | |
868 thread->set_safepoint_state(NULL); | |
869 } | |
870 } | |
871 | |
872 void ThreadSafepointState::examine_state_of_thread() { | |
873 assert(is_running(), "better be running or just have hit safepoint poll"); | |
874 | |
875 JavaThreadState state = _thread->thread_state(); | |
876 | |
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877 // Save the state at the start of safepoint processing. |
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878 _orig_thread_state = state; |
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879 |
0 | 880 // Check for a thread that is suspended. Note that thread resume tries |
881 // to grab the Threads_lock which we own here, so a thread cannot be | |
882 // resumed during safepoint synchronization. | |
883 | |
979 | 884 // We check to see if this thread is suspended without locking to |
885 // avoid deadlocking with a third thread that is waiting for this | |
886 // thread to be suspended. The third thread can notice the safepoint | |
887 // that we're trying to start at the beginning of its SR_lock->wait() | |
888 // call. If that happens, then the third thread will block on the | |
889 // safepoint while still holding the underlying SR_lock. We won't be | |
890 // able to get the SR_lock and we'll deadlock. | |
891 // | |
892 // We don't need to grab the SR_lock here for two reasons: | |
893 // 1) The suspend flags are both volatile and are set with an | |
894 // Atomic::cmpxchg() call so we should see the suspended | |
895 // state right away. | |
896 // 2) We're being called from the safepoint polling loop; if | |
897 // we don't see the suspended state on this iteration, then | |
898 // we'll come around again. | |
899 // | |
900 bool is_suspended = _thread->is_ext_suspended(); | |
0 | 901 if (is_suspended) { |
902 roll_forward(_at_safepoint); | |
903 return; | |
904 } | |
905 | |
906 // Some JavaThread states have an initial safepoint state of | |
907 // running, but are actually at a safepoint. We will happily | |
908 // agree and update the safepoint state here. | |
909 if (SafepointSynchronize::safepoint_safe(_thread, state)) { | |
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910 roll_forward(_at_safepoint); |
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911 SafepointSynchronize::check_for_lazy_critical_native(_thread, state); |
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912 if (_thread->in_critical()) { |
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913 // Notice that this thread is in a critical section |
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914 SafepointSynchronize::increment_jni_active_count(); |
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915 } |
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916 return; |
0 | 917 } |
918 | |
919 if (state == _thread_in_vm) { | |
920 roll_forward(_call_back); | |
921 return; | |
922 } | |
923 | |
924 // All other thread states will continue to run until they | |
925 // transition and self-block in state _blocked | |
926 // Safepoint polling in compiled code causes the Java threads to do the same. | |
927 // Note: new threads may require a malloc so they must be allowed to finish | |
928 | |
929 assert(is_running(), "examine_state_of_thread on non-running thread"); | |
930 return; | |
931 } | |
932 | |
933 // Returns true is thread could not be rolled forward at present position. | |
934 void ThreadSafepointState::roll_forward(suspend_type type) { | |
935 _type = type; | |
936 | |
937 switch(_type) { | |
938 case _at_safepoint: | |
939 SafepointSynchronize::signal_thread_at_safepoint(); | |
940 break; | |
941 | |
942 case _call_back: | |
943 set_has_called_back(false); | |
944 break; | |
945 | |
946 case _running: | |
947 default: | |
948 ShouldNotReachHere(); | |
949 } | |
950 } | |
951 | |
952 void ThreadSafepointState::restart() { | |
953 switch(type()) { | |
954 case _at_safepoint: | |
955 case _call_back: | |
956 break; | |
957 | |
958 case _running: | |
959 default: | |
960 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d", | |
961 _thread, _type); | |
962 _thread->print(); | |
963 ShouldNotReachHere(); | |
964 } | |
965 _type = _running; | |
966 set_has_called_back(false); | |
967 } | |
968 | |
969 | |
970 void ThreadSafepointState::print_on(outputStream *st) const { | |
971 const char *s; | |
972 | |
973 switch(_type) { | |
974 case _running : s = "_running"; break; | |
975 case _at_safepoint : s = "_at_safepoint"; break; | |
976 case _call_back : s = "_call_back"; break; | |
977 default: | |
978 ShouldNotReachHere(); | |
979 } | |
980 | |
981 st->print_cr("Thread: " INTPTR_FORMAT | |
982 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d", | |
983 _thread, _thread->osthread()->thread_id(), s, _has_called_back, | |
984 _at_poll_safepoint); | |
985 | |
986 _thread->print_thread_state_on(st); | |
987 } | |
988 | |
989 | |
990 // --------------------------------------------------------------------------------------------------------------------- | |
991 | |
992 // Block the thread at the safepoint poll or poll return. | |
993 void ThreadSafepointState::handle_polling_page_exception() { | |
994 | |
995 // Check state. block() will set thread state to thread_in_vm which will | |
996 // cause the safepoint state _type to become _call_back. | |
997 assert(type() == ThreadSafepointState::_running, | |
998 "polling page exception on thread not running state"); | |
999 | |
1000 // Step 1: Find the nmethod from the return address | |
1001 if (ShowSafepointMsgs && Verbose) { | |
1002 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc()); | |
1003 } | |
1004 address real_return_addr = thread()->saved_exception_pc(); | |
1005 | |
1006 CodeBlob *cb = CodeCache::find_blob(real_return_addr); | |
1007 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod"); | |
1008 nmethod* nm = (nmethod*)cb; | |
1009 | |
1010 // Find frame of caller | |
1011 frame stub_fr = thread()->last_frame(); | |
1012 CodeBlob* stub_cb = stub_fr.cb(); | |
1013 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub"); | |
1014 RegisterMap map(thread(), true); | |
1015 frame caller_fr = stub_fr.sender(&map); | |
1016 | |
1017 // Should only be poll_return or poll | |
1018 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" ); | |
1019 | |
1020 // This is a poll immediately before a return. The exception handling code | |
1021 // has already had the effect of causing the return to occur, so the execution | |
1022 // will continue immediately after the call. In addition, the oopmap at the | |
1023 // return point does not mark the return value as an oop (if it is), so | |
1024 // it needs a handle here to be updated. | |
1025 if( nm->is_at_poll_return(real_return_addr) ) { | |
1026 // See if return type is an oop. | |
1027 bool return_oop = nm->method()->is_returning_oop(); | |
1028 Handle return_value; | |
1029 if (return_oop) { | |
1030 // The oop result has been saved on the stack together with all | |
1031 // the other registers. In order to preserve it over GCs we need | |
1032 // to keep it in a handle. | |
1033 oop result = caller_fr.saved_oop_result(&map); | |
1034 assert(result == NULL || result->is_oop(), "must be oop"); | |
1035 return_value = Handle(thread(), result); | |
1036 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); | |
1037 } | |
1038 | |
1039 // Block the thread | |
1040 SafepointSynchronize::block(thread()); | |
1041 | |
1042 // restore oop result, if any | |
1043 if (return_oop) { | |
1044 caller_fr.set_saved_oop_result(&map, return_value()); | |
1045 } | |
1046 } | |
1047 | |
1048 // This is a safepoint poll. Verify the return address and block. | |
1049 else { | |
1050 set_at_poll_safepoint(true); | |
1051 | |
1052 // verify the blob built the "return address" correctly | |
1053 assert(real_return_addr == caller_fr.pc(), "must match"); | |
1054 | |
1055 // Block the thread | |
1056 SafepointSynchronize::block(thread()); | |
1057 set_at_poll_safepoint(false); | |
1058 | |
1059 // If we have a pending async exception deoptimize the frame | |
1060 // as otherwise we may never deliver it. | |
1061 if (thread()->has_async_condition()) { | |
1062 ThreadInVMfromJavaNoAsyncException __tiv(thread()); | |
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1063 Deoptimization::deoptimize_frame(thread(), caller_fr.id(), Deoptimization::Reason_constraint); |
0 | 1064 } |
1065 | |
1066 // If an exception has been installed we must check for a pending deoptimization | |
1067 // Deoptimize frame if exception has been thrown. | |
1068 | |
1069 if (thread()->has_pending_exception() ) { | |
1070 RegisterMap map(thread(), true); | |
1071 frame caller_fr = stub_fr.sender(&map); | |
1072 if (caller_fr.is_deoptimized_frame()) { | |
1073 // The exception patch will destroy registers that are still | |
1074 // live and will be needed during deoptimization. Defer the | |
1075 // Async exception should have defered the exception until the | |
1076 // next safepoint which will be detected when we get into | |
1077 // the interpreter so if we have an exception now things | |
1078 // are messed up. | |
1079 | |
1080 fatal("Exception installed and deoptimization is pending"); | |
1081 } | |
1082 } | |
1083 } | |
1084 } | |
1085 | |
1086 | |
1087 // | |
1088 // Statistics & Instrumentations | |
1089 // | |
1090 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL; | |
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1091 jlong SafepointSynchronize::_safepoint_begin_time = 0; |
0 | 1092 int SafepointSynchronize::_cur_stat_index = 0; |
1093 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating]; | |
1094 julong SafepointSynchronize::_coalesced_vmop_count = 0; | |
1095 jlong SafepointSynchronize::_max_sync_time = 0; | |
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1096 jlong SafepointSynchronize::_max_vmop_time = 0; |
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1097 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f; |
0 | 1098 |
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1099 static jlong cleanup_end_time = 0; |
0 | 1100 static bool need_to_track_page_armed_status = false; |
1101 static bool init_done = false; | |
1102 | |
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1103 // Helper method to print the header. |
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1104 static void print_header() { |
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1105 tty->print(" vmop " |
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1106 "[threads: total initially_running wait_to_block] "); |
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1107 tty->print("[time: spin block sync cleanup vmop] "); |
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1108 |
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1109 // no page armed status printed out if it is always armed. |
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1110 if (need_to_track_page_armed_status) { |
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1111 tty->print("page_armed "); |
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1112 } |
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1113 |
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1114 tty->print_cr("page_trap_count"); |
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1115 } |
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1116 |
0 | 1117 void SafepointSynchronize::deferred_initialize_stat() { |
1118 if (init_done) return; | |
1119 | |
1120 if (PrintSafepointStatisticsCount <= 0) { | |
1121 fatal("Wrong PrintSafepointStatisticsCount"); | |
1122 } | |
1123 | |
1124 // If PrintSafepointStatisticsTimeout is specified, the statistics data will | |
1125 // be printed right away, in which case, _safepoint_stats will regress to | |
1126 // a single element array. Otherwise, it is a circular ring buffer with default | |
1127 // size of PrintSafepointStatisticsCount. | |
1128 int stats_array_size; | |
1129 if (PrintSafepointStatisticsTimeout > 0) { | |
1130 stats_array_size = 1; | |
1131 PrintSafepointStatistics = true; | |
1132 } else { | |
1133 stats_array_size = PrintSafepointStatisticsCount; | |
1134 } | |
1135 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size | |
1136 * sizeof(SafepointStats)); | |
1137 guarantee(_safepoint_stats != NULL, | |
1138 "not enough memory for safepoint instrumentation data"); | |
1139 | |
1140 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) { | |
1141 need_to_track_page_armed_status = true; | |
1142 } | |
1143 init_done = true; | |
1144 } | |
1145 | |
1146 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) { | |
1003 | 1147 assert(init_done, "safepoint statistics array hasn't been initialized"); |
0 | 1148 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
1149 | |
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1150 spstat->_time_stamp = _ts_of_current_safepoint; |
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1151 |
0 | 1152 VM_Operation *op = VMThread::vm_operation(); |
1153 spstat->_vmop_type = (op != NULL ? op->type() : -1); | |
1154 if (op != NULL) { | |
1155 _safepoint_reasons[spstat->_vmop_type]++; | |
1156 } | |
1157 | |
1158 spstat->_nof_total_threads = nof_threads; | |
1159 spstat->_nof_initial_running_threads = nof_running; | |
1160 spstat->_nof_threads_hit_page_trap = 0; | |
1161 | |
1162 // Records the start time of spinning. The real time spent on spinning | |
1163 // will be adjusted when spin is done. Same trick is applied for time | |
1164 // spent on waiting for threads to block. | |
1165 if (nof_running != 0) { | |
1166 spstat->_time_to_spin = os::javaTimeNanos(); | |
1167 } else { | |
1168 spstat->_time_to_spin = 0; | |
1169 } | |
1170 } | |
1171 | |
1172 void SafepointSynchronize::update_statistics_on_spin_end() { | |
1173 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1174 | |
1175 jlong cur_time = os::javaTimeNanos(); | |
1176 | |
1177 spstat->_nof_threads_wait_to_block = _waiting_to_block; | |
1178 if (spstat->_nof_initial_running_threads != 0) { | |
1179 spstat->_time_to_spin = cur_time - spstat->_time_to_spin; | |
1180 } | |
1181 | |
1182 if (need_to_track_page_armed_status) { | |
1183 spstat->_page_armed = (PageArmed == 1); | |
1184 } | |
1185 | |
1186 // Records the start time of waiting for to block. Updated when block is done. | |
1187 if (_waiting_to_block != 0) { | |
1188 spstat->_time_to_wait_to_block = cur_time; | |
1189 } else { | |
1190 spstat->_time_to_wait_to_block = 0; | |
1191 } | |
1192 } | |
1193 | |
1194 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) { | |
1195 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1196 | |
1197 if (spstat->_nof_threads_wait_to_block != 0) { | |
1198 spstat->_time_to_wait_to_block = end_time - | |
1199 spstat->_time_to_wait_to_block; | |
1200 } | |
1201 | |
1202 // Records the end time of sync which will be used to calculate the total | |
1203 // vm operation time. Again, the real time spending in syncing will be deducted | |
1204 // from the start of the sync time later when end_statistics is called. | |
1291
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1205 spstat->_time_to_sync = end_time - _safepoint_begin_time; |
0 | 1206 if (spstat->_time_to_sync > _max_sync_time) { |
1207 _max_sync_time = spstat->_time_to_sync; | |
1208 } | |
1291
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1209 |
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1210 spstat->_time_to_do_cleanups = end_time; |
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1211 } |
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1212 |
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1213 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) { |
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1214 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
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1215 |
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1216 // Record how long spent in cleanup tasks. |
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1217 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups; |
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1218 |
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1219 cleanup_end_time = end_time; |
0 | 1220 } |
1221 | |
1222 void SafepointSynchronize::end_statistics(jlong vmop_end_time) { | |
1223 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1224 | |
1225 // Update the vm operation time. | |
1291
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1226 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time; |
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1227 if (spstat->_time_to_exec_vmop > _max_vmop_time) { |
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1228 _max_vmop_time = spstat->_time_to_exec_vmop; |
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1229 } |
0 | 1230 // Only the sync time longer than the specified |
1231 // PrintSafepointStatisticsTimeout will be printed out right away. | |
1232 // By default, it is -1 meaning all samples will be put into the list. | |
1233 if ( PrintSafepointStatisticsTimeout > 0) { | |
1234 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1235 print_statistics(); | |
1236 } | |
1237 } else { | |
1238 // The safepoint statistics will be printed out when the _safepoin_stats | |
1239 // array fills up. | |
1291
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1240 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) { |
0 | 1241 print_statistics(); |
1242 _cur_stat_index = 0; | |
1291
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1243 } else { |
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1244 _cur_stat_index++; |
0 | 1245 } |
1246 } | |
1247 } | |
1248 | |
1249 void SafepointSynchronize::print_statistics() { | |
1250 SafepointStats* sstats = _safepoint_stats; | |
1251 | |
1291
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1252 for (int index = 0; index <= _cur_stat_index; index++) { |
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1253 if (index % 30 == 0) { |
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1254 print_header(); |
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1255 } |
0 | 1256 sstats = &_safepoint_stats[index]; |
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1257 tty->print("%.3f: ", sstats->_time_stamp); |
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1258 tty->print("%-26s [" |
0 | 1259 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15) |
1291
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1260 " ] ", |
0 | 1261 sstats->_vmop_type == -1 ? "no vm operation" : |
1262 VM_Operation::name(sstats->_vmop_type), | |
1263 sstats->_nof_total_threads, | |
1264 sstats->_nof_initial_running_threads, | |
1265 sstats->_nof_threads_wait_to_block); | |
1266 // "/ MICROUNITS " is to convert the unit from nanos to millis. | |
1291
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1267 tty->print(" [" |
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1268 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1269 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1270 INT64_FORMAT_W(6)" ] ", |
0 | 1271 sstats->_time_to_spin / MICROUNITS, |
1272 sstats->_time_to_wait_to_block / MICROUNITS, | |
1273 sstats->_time_to_sync / MICROUNITS, | |
1291
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1274 sstats->_time_to_do_cleanups / MICROUNITS, |
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1275 sstats->_time_to_exec_vmop / MICROUNITS); |
0 | 1276 |
1277 if (need_to_track_page_armed_status) { | |
1278 tty->print(INT32_FORMAT" ", sstats->_page_armed); | |
1279 } | |
1280 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap); | |
1281 } | |
1282 } | |
1283 | |
1284 // This method will be called when VM exits. It will first call | |
1285 // print_statistics to print out the rest of the sampling. Then | |
1286 // it tries to summarize the sampling. | |
1287 void SafepointSynchronize::print_stat_on_exit() { | |
1288 if (_safepoint_stats == NULL) return; | |
1289 | |
1290 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1291 | |
1292 // During VM exit, end_statistics may not get called and in that | |
1293 // case, if the sync time is less than PrintSafepointStatisticsTimeout, | |
1294 // don't print it out. | |
1295 // Approximate the vm op time. | |
1296 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop = | |
1291
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1297 os::javaTimeNanos() - cleanup_end_time; |
0 | 1298 |
1299 if ( PrintSafepointStatisticsTimeout < 0 || | |
1300 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1301 print_statistics(); | |
1302 } | |
1303 tty->print_cr(""); | |
1304 | |
1305 // Print out polling page sampling status. | |
1306 if (!need_to_track_page_armed_status) { | |
1307 if (UseCompilerSafepoints) { | |
1308 tty->print_cr("Polling page always armed"); | |
1309 } | |
1310 } else { | |
1311 tty->print_cr("Defer polling page loop count = %d\n", | |
1312 DeferPollingPageLoopCount); | |
1313 } | |
1314 | |
1315 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) { | |
1316 if (_safepoint_reasons[index] != 0) { | |
1317 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index), | |
1318 _safepoint_reasons[index]); | |
1319 } | |
1320 } | |
1321 | |
1322 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint", | |
1323 _coalesced_vmop_count); | |
1324 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms", | |
1325 _max_sync_time / MICROUNITS); | |
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1326 tty->print_cr("Maximum vm operation time (except for Exit VM operation) " |
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1327 INT64_FORMAT_W(5)" ms", |
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1328 _max_vmop_time / MICROUNITS); |
0 | 1329 } |
1330 | |
1331 // ------------------------------------------------------------------------------------------------ | |
1332 // Non-product code | |
1333 | |
1334 #ifndef PRODUCT | |
1335 | |
1336 void SafepointSynchronize::print_state() { | |
1337 if (_state == _not_synchronized) { | |
1338 tty->print_cr("not synchronized"); | |
1339 } else if (_state == _synchronizing || _state == _synchronized) { | |
1340 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" : | |
1341 "synchronized"); | |
1342 | |
1343 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
1344 cur->safepoint_state()->print(); | |
1345 } | |
1346 } | |
1347 } | |
1348 | |
1349 void SafepointSynchronize::safepoint_msg(const char* format, ...) { | |
1350 if (ShowSafepointMsgs) { | |
1351 va_list ap; | |
1352 va_start(ap, format); | |
1353 tty->vprint_cr(format, ap); | |
1354 va_end(ap); | |
1355 } | |
1356 } | |
1357 | |
1358 #endif // !PRODUCT |