Mercurial > hg > truffle
annotate src/share/vm/runtime/safepoint.cpp @ 6080:7432b9db36ff
7165755: OS Information much longer on linux than other platforms
Reviewed-by: sla, dholmes
author | nloodin |
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date | Thu, 10 May 2012 15:44:19 +0200 |
parents | 541c4a5e7b88 |
children | e9140bf80b4a |
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"); | |
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222 // Clear the visited flag to ensure that the critical counts are collected properly. |
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223 cur->set_visited_for_critical_count(false); |
0 | 224 } |
225 #endif // ASSERT | |
226 | |
227 if (SafepointTimeout) | |
228 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS; | |
229 | |
230 // Iterate through all threads until it have been determined how to stop them all at a safepoint | |
231 unsigned int iterations = 0; | |
232 int steps = 0 ; | |
233 while(still_running > 0) { | |
234 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
235 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended"); | |
236 ThreadSafepointState *cur_state = cur->safepoint_state(); | |
237 if (cur_state->is_running()) { | |
238 cur_state->examine_state_of_thread(); | |
239 if (!cur_state->is_running()) { | |
240 still_running--; | |
241 // consider adjusting steps downward: | |
242 // steps = 0 | |
243 // steps -= NNN | |
244 // steps >>= 1 | |
245 // steps = MIN(steps, 2000-100) | |
246 // if (iterations != 0) steps -= NNN | |
247 } | |
248 if (TraceSafepoint && Verbose) cur_state->print(); | |
249 } | |
250 } | |
251 | |
1003 | 252 if (PrintSafepointStatistics && iterations == 0) { |
0 | 253 begin_statistics(nof_threads, still_running); |
254 } | |
255 | |
256 if (still_running > 0) { | |
257 // Check for if it takes to long | |
258 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) { | |
259 print_safepoint_timeout(_spinning_timeout); | |
260 } | |
261 | |
262 // Spin to avoid context switching. | |
263 // There's a tension between allowing the mutators to run (and rendezvous) | |
264 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that | |
265 // a mutator might otherwise use profitably to reach a safepoint. Excessive | |
266 // spinning by the VM thread on a saturated system can increase rendezvous latency. | |
267 // Blocking or yielding incur their own penalties in the form of context switching | |
268 // and the resultant loss of $ residency. | |
269 // | |
270 // Further complicating matters is that yield() does not work as naively expected | |
271 // on many platforms -- yield() does not guarantee that any other ready threads | |
272 // will run. As such we revert yield_all() after some number of iterations. | |
273 // Yield_all() is implemented as a short unconditional sleep on some platforms. | |
274 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping | |
275 // can actually increase the time it takes the VM thread to detect that a system-wide | |
276 // stop-the-world safepoint has been reached. In a pathological scenario such as that | |
277 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe. | |
278 // In that case the mutators will be stalled waiting for the safepoint to complete and the | |
279 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread | |
280 // will eventually wake up and detect that all mutators are safe, at which point | |
281 // we'll again make progress. | |
282 // | |
283 // Beware too that that the VMThread typically runs at elevated priority. | |
284 // Its default priority is higher than the default mutator priority. | |
285 // Obviously, this complicates spinning. | |
286 // | |
287 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0). | |
288 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will. | |
289 // | |
290 // See the comments in synchronizer.cpp for additional remarks on spinning. | |
291 // | |
292 // In the future we might: | |
293 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning. | |
294 // This is tricky as the path used by a thread exiting the JVM (say on | |
295 // on JNI call-out) simply stores into its state field. The burden | |
296 // is placed on the VM thread, which must poll (spin). | |
297 // 2. Find something useful to do while spinning. If the safepoint is GC-related | |
298 // we might aggressively scan the stacks of threads that are already safe. | |
299 // 3. Use Solaris schedctl to examine the state of the still-running mutators. | |
300 // If all the mutators are ONPROC there's no reason to sleep or yield. | |
301 // 4. YieldTo() any still-running mutators that are ready but OFFPROC. | |
302 // 5. Check system saturation. If the system is not fully saturated then | |
303 // simply spin and avoid sleep/yield. | |
304 // 6. As still-running mutators rendezvous they could unpark the sleeping | |
305 // VMthread. This works well for still-running mutators that become | |
306 // safe. The VMthread must still poll for mutators that call-out. | |
307 // 7. Drive the policy on time-since-begin instead of iterations. | |
308 // 8. Consider making the spin duration a function of the # of CPUs: | |
309 // Spin = (((ncpus-1) * M) + K) + F(still_running) | |
310 // Alternately, instead of counting iterations of the outer loop | |
311 // we could count the # of threads visited in the inner loop, above. | |
312 // 9. On windows consider using the return value from SwitchThreadTo() | |
313 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions. | |
314 | |
315 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) { | |
316 guarantee (PageArmed == 0, "invariant") ; | |
317 PageArmed = 1 ; | |
318 os::make_polling_page_unreadable(); | |
319 } | |
320 | |
321 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or | |
322 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus) | |
323 ++steps ; | |
324 if (ncpus > 1 && steps < SafepointSpinBeforeYield) { | |
325 SpinPause() ; // MP-Polite spin | |
326 } else | |
327 if (steps < DeferThrSuspendLoopCount) { | |
328 os::NakedYield() ; | |
329 } else { | |
330 os::yield_all(steps) ; | |
331 // Alternately, the VM thread could transiently depress its scheduling priority or | |
332 // transiently increase the priority of the tardy mutator(s). | |
333 } | |
334 | |
335 iterations ++ ; | |
336 } | |
337 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long"); | |
338 } | |
339 assert(still_running == 0, "sanity check"); | |
340 | |
341 if (PrintSafepointStatistics) { | |
342 update_statistics_on_spin_end(); | |
343 } | |
344 | |
345 // wait until all threads are stopped | |
346 while (_waiting_to_block > 0) { | |
347 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block); | |
348 if (!SafepointTimeout || timeout_error_printed) { | |
349 Safepoint_lock->wait(true); // true, means with no safepoint checks | |
350 } else { | |
351 // Compute remaining time | |
352 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos(); | |
353 | |
354 // If there is no remaining time, then there is an error | |
355 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) { | |
356 print_safepoint_timeout(_blocking_timeout); | |
357 } | |
358 } | |
359 } | |
360 assert(_waiting_to_block == 0, "sanity check"); | |
361 | |
362 #ifndef PRODUCT | |
363 if (SafepointTimeout) { | |
364 jlong current_time = os::javaTimeNanos(); | |
365 if (safepoint_limit_time < current_time) { | |
366 tty->print_cr("# SafepointSynchronize: Finished after " | |
367 INT64_FORMAT_W(6) " ms", | |
368 ((current_time - safepoint_limit_time) / MICROUNITS + | |
369 SafepointTimeoutDelay)); | |
370 } | |
371 } | |
372 #endif | |
373 | |
374 assert((_safepoint_counter & 0x1) == 0, "must be even"); | |
375 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
376 _safepoint_counter ++; | |
377 | |
378 // Record state | |
379 _state = _synchronized; | |
380 | |
381 OrderAccess::fence(); | |
382 | |
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383 #ifdef ASSERT |
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384 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { |
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385 // make sure all the threads were visited |
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386 assert(cur->was_visited_for_critical_count(), "missed a thread"); |
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387 } |
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388 #endif // ASSERT |
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389 |
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390 // Update the count of active JNI critical regions |
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391 GC_locker::set_jni_lock_count(_current_jni_active_count); |
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392 |
0 | 393 if (TraceSafepoint) { |
394 VM_Operation *op = VMThread::vm_operation(); | |
395 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation"); | |
396 } | |
397 | |
398 RuntimeService::record_safepoint_synchronized(); | |
399 if (PrintSafepointStatistics) { | |
400 update_statistics_on_sync_end(os::javaTimeNanos()); | |
401 } | |
402 | |
403 // Call stuff that needs to be run when a safepoint is just about to be completed | |
404 do_cleanup_tasks(); | |
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405 |
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406 if (PrintSafepointStatistics) { |
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407 // Record how much time spend on the above cleanup tasks |
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408 update_statistics_on_cleanup_end(os::javaTimeNanos()); |
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409 } |
0 | 410 } |
411 | |
412 // Wake up all threads, so they are ready to resume execution after the safepoint | |
413 // operation has been carried out | |
414 void SafepointSynchronize::end() { | |
415 | |
416 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
417 assert((_safepoint_counter & 0x1) == 1, "must be odd"); | |
418 _safepoint_counter ++; | |
419 // memory fence isn't required here since an odd _safepoint_counter | |
420 // value can do no harm and a fence is issued below anyway. | |
421 | |
422 DEBUG_ONLY(Thread* myThread = Thread::current();) | |
423 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint"); | |
424 | |
425 if (PrintSafepointStatistics) { | |
426 end_statistics(os::javaTimeNanos()); | |
427 } | |
428 | |
429 #ifdef ASSERT | |
430 // A pending_exception cannot be installed during a safepoint. The threads | |
431 // may install an async exception after they come back from a safepoint into | |
432 // pending_exception after they unblock. But that should happen later. | |
433 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
434 assert (!(cur->has_pending_exception() && | |
435 cur->safepoint_state()->is_at_poll_safepoint()), | |
436 "safepoint installed a pending exception"); | |
437 } | |
438 #endif // ASSERT | |
439 | |
440 if (PageArmed) { | |
441 // Make polling safepoint aware | |
442 os::make_polling_page_readable(); | |
443 PageArmed = 0 ; | |
444 } | |
445 | |
446 // Remove safepoint check from interpreter | |
447 Interpreter::ignore_safepoints(); | |
448 | |
449 { | |
450 MutexLocker mu(Safepoint_lock); | |
451 | |
452 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization"); | |
453 | |
454 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method | |
455 // when they get restarted. | |
456 _state = _not_synchronized; | |
457 OrderAccess::fence(); | |
458 | |
459 if (TraceSafepoint) { | |
460 tty->print_cr("Leaving safepoint region"); | |
461 } | |
462 | |
463 // Start suspended threads | |
464 for(JavaThread *current = Threads::first(); current; current = current->next()) { | |
605 | 465 // A problem occurring on Solaris is when attempting to restart threads |
0 | 466 // the first #cpus - 1 go well, but then the VMThread is preempted when we get |
467 // to the next one (since it has been running the longest). We then have | |
468 // to wait for a cpu to become available before we can continue restarting | |
469 // threads. | |
470 // FIXME: This causes the performance of the VM to degrade when active and with | |
471 // large numbers of threads. Apparently this is due to the synchronous nature | |
472 // of suspending threads. | |
473 // | |
474 // TODO-FIXME: the comments above are vestigial and no longer apply. | |
475 // Furthermore, using solaris' schedctl in this particular context confers no benefit | |
476 if (VMThreadHintNoPreempt) { | |
477 os::hint_no_preempt(); | |
478 } | |
479 ThreadSafepointState* cur_state = current->safepoint_state(); | |
480 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint"); | |
481 cur_state->restart(); | |
482 assert(cur_state->is_running(), "safepoint state has not been reset"); | |
483 } | |
484 | |
485 RuntimeService::record_safepoint_end(); | |
486 | |
487 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads | |
488 // blocked in signal_thread_blocked | |
489 Threads_lock->unlock(); | |
490 | |
491 } | |
492 #ifndef SERIALGC | |
493 // If there are any concurrent GC threads resume them. | |
494 if (UseConcMarkSweepGC) { | |
495 ConcurrentMarkSweepThread::desynchronize(false); | |
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496 } else if (UseG1GC) { |
0 | 497 ConcurrentGCThread::safepoint_desynchronize(); |
498 } | |
499 #endif // SERIALGC | |
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500 // record this time so VMThread can keep track how much time has elasped |
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501 // since last safepoint. |
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502 _end_of_last_safepoint = os::javaTimeMillis(); |
0 | 503 } |
504 | |
505 bool SafepointSynchronize::is_cleanup_needed() { | |
506 // Need a safepoint if some inline cache buffers is non-empty | |
507 if (!InlineCacheBuffer::is_empty()) return true; | |
508 return false; | |
509 } | |
510 | |
511 | |
512 | |
513 // Various cleaning tasks that should be done periodically at safepoints | |
514 void SafepointSynchronize::do_cleanup_tasks() { | |
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515 { |
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516 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); |
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517 ObjectSynchronizer::deflate_idle_monitors(); |
0 | 518 } |
519 | |
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520 { |
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521 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); |
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522 InlineCacheBuffer::update_inline_caches(); |
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523 } |
1783 | 524 { |
525 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime); | |
526 CompilationPolicy::policy()->do_safepoint_work(); | |
0 | 527 } |
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528 |
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529 TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime); |
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530 NMethodSweeper::scan_stacks(); |
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531 |
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532 // rotate log files? |
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533 if (UseGCLogFileRotation) { |
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534 gclog_or_tty->rotate_log(); |
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535 } |
0 | 536 } |
537 | |
538 | |
539 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) { | |
540 switch(state) { | |
541 case _thread_in_native: | |
542 // native threads are safe if they have no java stack or have walkable stack | |
543 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable(); | |
544 | |
545 // blocked threads should have already have walkable stack | |
546 case _thread_blocked: | |
547 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable"); | |
548 return true; | |
549 | |
550 default: | |
551 return false; | |
552 } | |
553 } | |
554 | |
555 | |
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556 // See if the thread is running inside a lazy critical native and |
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557 // update the thread critical count if so. Also set a suspend flag to |
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558 // cause the native wrapper to return into the JVM to do the unlock |
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559 // once the native finishes. |
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560 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) { |
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561 if (state == _thread_in_native && |
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562 thread->has_last_Java_frame() && |
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563 thread->frame_anchor()->walkable()) { |
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564 // This thread might be in a critical native nmethod so look at |
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565 // the top of the stack and increment the critical count if it |
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566 // is. |
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567 frame wrapper_frame = thread->last_frame(); |
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568 CodeBlob* stub_cb = wrapper_frame.cb(); |
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569 if (stub_cb != NULL && |
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570 stub_cb->is_nmethod() && |
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571 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) { |
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572 // A thread could potentially be in a critical native across |
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573 // more than one safepoint, so only update the critical state on |
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574 // the first one. When it returns it will perform the unlock. |
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575 if (!thread->do_critical_native_unlock()) { |
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576 #ifdef ASSERT |
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577 if (!thread->in_critical()) { |
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578 GC_locker::increment_debug_jni_lock_count(); |
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579 } |
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580 #endif |
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581 thread->enter_critical(); |
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582 // Make sure the native wrapper calls back on return to |
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583 // perform the needed critical unlock. |
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584 thread->set_critical_native_unlock(); |
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585 } |
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586 } |
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587 } |
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588 } |
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589 |
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590 |
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591 |
0 | 592 // ------------------------------------------------------------------------------------------------------- |
593 // Implementation of Safepoint callback point | |
594 | |
595 void SafepointSynchronize::block(JavaThread *thread) { | |
596 assert(thread != NULL, "thread must be set"); | |
597 assert(thread->is_Java_thread(), "not a Java thread"); | |
598 | |
599 // Threads shouldn't block if they are in the middle of printing, but... | |
600 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id()); | |
601 | |
602 // Only bail from the block() call if the thread is gone from the | |
603 // thread list; starting to exit should still block. | |
604 if (thread->is_terminated()) { | |
605 // block current thread if we come here from native code when VM is gone | |
606 thread->block_if_vm_exited(); | |
607 | |
608 // otherwise do nothing | |
609 return; | |
610 } | |
611 | |
612 JavaThreadState state = thread->thread_state(); | |
613 thread->frame_anchor()->make_walkable(thread); | |
614 | |
615 // Check that we have a valid thread_state at this point | |
616 switch(state) { | |
617 case _thread_in_vm_trans: | |
618 case _thread_in_Java: // From compiled code | |
619 | |
620 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case, | |
621 // we pretend we are still in the VM. | |
622 thread->set_thread_state(_thread_in_vm); | |
623 | |
624 if (is_synchronizing()) { | |
625 Atomic::inc (&TryingToBlock) ; | |
626 } | |
627 | |
628 // We will always be holding the Safepoint_lock when we are examine the state | |
629 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and | |
630 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code | |
631 Safepoint_lock->lock_without_safepoint_check(); | |
632 if (is_synchronizing()) { | |
633 // Decrement the number of threads to wait for and signal vm thread | |
634 assert(_waiting_to_block > 0, "sanity check"); | |
635 _waiting_to_block--; | |
636 thread->safepoint_state()->set_has_called_back(true); | |
637 | |
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638 DEBUG_ONLY(thread->set_visited_for_critical_count(true)); |
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639 if (thread->in_critical()) { |
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640 // Notice that this thread is in a critical section |
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641 increment_jni_active_count(); |
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642 } |
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643 |
0 | 644 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread |
645 if (_waiting_to_block == 0) { | |
646 Safepoint_lock->notify_all(); | |
647 } | |
648 } | |
649 | |
650 // We transition the thread to state _thread_blocked here, but | |
651 // we can't do our usual check for external suspension and then | |
652 // self-suspend after the lock_without_safepoint_check() call | |
653 // below because we are often called during transitions while | |
654 // we hold different locks. That would leave us suspended while | |
655 // holding a resource which results in deadlocks. | |
656 thread->set_thread_state(_thread_blocked); | |
657 Safepoint_lock->unlock(); | |
658 | |
659 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during | |
660 // the entire safepoint, the threads will all line up here during the safepoint. | |
661 Threads_lock->lock_without_safepoint_check(); | |
662 // restore original state. This is important if the thread comes from compiled code, so it | |
663 // will continue to execute with the _thread_in_Java state. | |
664 thread->set_thread_state(state); | |
665 Threads_lock->unlock(); | |
666 break; | |
667 | |
668 case _thread_in_native_trans: | |
669 case _thread_blocked_trans: | |
670 case _thread_new_trans: | |
671 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) { | |
672 thread->print_thread_state(); | |
673 fatal("Deadlock in safepoint code. " | |
674 "Should have called back to the VM before blocking."); | |
675 } | |
676 | |
677 // We transition the thread to state _thread_blocked here, but | |
678 // we can't do our usual check for external suspension and then | |
679 // self-suspend after the lock_without_safepoint_check() call | |
680 // below because we are often called during transitions while | |
681 // we hold different locks. That would leave us suspended while | |
682 // holding a resource which results in deadlocks. | |
683 thread->set_thread_state(_thread_blocked); | |
684 | |
685 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence, | |
686 // the safepoint code might still be waiting for it to block. We need to change the state here, | |
687 // so it can see that it is at a safepoint. | |
688 | |
689 // Block until the safepoint operation is completed. | |
690 Threads_lock->lock_without_safepoint_check(); | |
691 | |
692 // Restore state | |
693 thread->set_thread_state(state); | |
694 | |
695 Threads_lock->unlock(); | |
696 break; | |
697 | |
698 default: | |
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699 fatal(err_msg("Illegal threadstate encountered: %d", state)); |
0 | 700 } |
701 | |
702 // Check for pending. async. exceptions or suspends - except if the | |
703 // thread was blocked inside the VM. has_special_runtime_exit_condition() | |
704 // is called last since it grabs a lock and we only want to do that when | |
705 // we must. | |
706 // | |
707 // Note: we never deliver an async exception at a polling point as the | |
708 // compiler may not have an exception handler for it. The polling | |
709 // code will notice the async and deoptimize and the exception will | |
710 // be delivered. (Polling at a return point is ok though). Sure is | |
711 // a lot of bother for a deprecated feature... | |
712 // | |
713 // We don't deliver an async exception if the thread state is | |
714 // _thread_in_native_trans so JNI functions won't be called with | |
715 // a surprising pending exception. If the thread state is going back to java, | |
716 // async exception is checked in check_special_condition_for_native_trans(). | |
717 | |
718 if (state != _thread_blocked_trans && | |
719 state != _thread_in_vm_trans && | |
720 thread->has_special_runtime_exit_condition()) { | |
721 thread->handle_special_runtime_exit_condition( | |
722 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans)); | |
723 } | |
724 } | |
725 | |
726 // ------------------------------------------------------------------------------------------------------ | |
727 // Exception handlers | |
728 | |
729 #ifndef PRODUCT | |
730 #ifdef _LP64 | |
731 #define PTR_PAD "" | |
732 #else | |
733 #define PTR_PAD " " | |
734 #endif | |
735 | |
736 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) { | |
737 bool is_oop = newptr ? ((oop)newptr)->is_oop() : false; | |
738 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s", | |
739 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
740 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
741 } | |
742 | |
743 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) { | |
744 bool is_oop = newptr ? ((oop)(intptr_t)newptr)->is_oop() : false; | |
745 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s", | |
746 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
747 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
748 } | |
749 | |
750 #ifdef SPARC | |
751 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) { | |
752 #ifdef _LP64 | |
753 tty->print_cr("--------+------address-----+------before-----------+-------after----------+"); | |
754 const int incr = 1; // Increment to skip a long, in units of intptr_t | |
755 #else | |
756 tty->print_cr("--------+--address-+------before-----------+-------after----------+"); | |
757 const int incr = 2; // Increment to skip a long, in units of intptr_t | |
758 #endif | |
759 tty->print_cr("---SP---|"); | |
760 for( int i=0; i<16; i++ ) { | |
761 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
762 tty->print_cr("--------|"); | |
763 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) { | |
764 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
765 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); | |
766 tty->print_cr("--------|"); | |
767 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; | |
768 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; | |
769 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; | |
770 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; | |
771 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp); | |
772 old_sp += incr; new_sp += incr; was_oops += incr; | |
773 // Skip the floats | |
774 tty->print_cr("--Float-|"PTR_FORMAT,new_sp); | |
775 tty->print_cr("---FP---|"); | |
776 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32; | |
777 for( int i2=0; i2<16; i2++ ) { | |
778 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
779 tty->print_cr(""); | |
780 } | |
781 #endif // SPARC | |
782 #endif // PRODUCT | |
783 | |
784 | |
785 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { | |
786 assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); | |
787 assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); | |
788 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization"); | |
789 | |
790 // Uncomment this to get some serious before/after printing of the | |
791 // Sparc safepoint-blob frame structure. | |
792 /* | |
793 intptr_t* sp = thread->last_Java_sp(); | |
794 intptr_t stack_copy[150]; | |
795 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i]; | |
796 bool was_oops[150]; | |
797 for( int i=0; i<150; i++ ) | |
798 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false; | |
799 */ | |
800 | |
801 if (ShowSafepointMsgs) { | |
802 tty->print("handle_polling_page_exception: "); | |
803 } | |
804 | |
805 if (PrintSafepointStatistics) { | |
806 inc_page_trap_count(); | |
807 } | |
808 | |
809 ThreadSafepointState* state = thread->safepoint_state(); | |
810 | |
811 state->handle_polling_page_exception(); | |
812 // print_me(sp,stack_copy,was_oops); | |
813 } | |
814 | |
815 | |
816 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) { | |
817 if (!timeout_error_printed) { | |
818 timeout_error_printed = true; | |
819 // Print out the thread infor which didn't reach the safepoint for debugging | |
820 // purposes (useful when there are lots of threads in the debugger). | |
821 tty->print_cr(""); | |
822 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:"); | |
823 if (reason == _spinning_timeout) { | |
824 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint."); | |
825 } else if (reason == _blocking_timeout) { | |
826 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop."); | |
827 } | |
828 | |
829 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:"); | |
830 ThreadSafepointState *cur_state; | |
831 ResourceMark rm; | |
832 for(JavaThread *cur_thread = Threads::first(); cur_thread; | |
833 cur_thread = cur_thread->next()) { | |
834 cur_state = cur_thread->safepoint_state(); | |
835 | |
836 if (cur_thread->thread_state() != _thread_blocked && | |
837 ((reason == _spinning_timeout && cur_state->is_running()) || | |
838 (reason == _blocking_timeout && !cur_state->has_called_back()))) { | |
839 tty->print("# "); | |
840 cur_thread->print(); | |
841 tty->print_cr(""); | |
842 } | |
843 } | |
844 tty->print_cr("# SafepointSynchronize::begin: (End of list)"); | |
845 } | |
846 | |
847 // To debug the long safepoint, specify both DieOnSafepointTimeout & | |
848 // ShowMessageBoxOnError. | |
849 if (DieOnSafepointTimeout) { | |
850 char msg[1024]; | |
851 VM_Operation *op = VMThread::vm_operation(); | |
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852 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.", |
0 | 853 SafepointTimeoutDelay, |
854 op != NULL ? op->name() : "no vm operation"); | |
855 fatal(msg); | |
856 } | |
857 } | |
858 | |
859 | |
860 // ------------------------------------------------------------------------------------------------------- | |
861 // Implementation of ThreadSafepointState | |
862 | |
863 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) { | |
864 _thread = thread; | |
865 _type = _running; | |
866 _has_called_back = false; | |
867 _at_poll_safepoint = false; | |
868 } | |
869 | |
870 void ThreadSafepointState::create(JavaThread *thread) { | |
871 ThreadSafepointState *state = new ThreadSafepointState(thread); | |
872 thread->set_safepoint_state(state); | |
873 } | |
874 | |
875 void ThreadSafepointState::destroy(JavaThread *thread) { | |
876 if (thread->safepoint_state()) { | |
877 delete(thread->safepoint_state()); | |
878 thread->set_safepoint_state(NULL); | |
879 } | |
880 } | |
881 | |
882 void ThreadSafepointState::examine_state_of_thread() { | |
883 assert(is_running(), "better be running or just have hit safepoint poll"); | |
884 | |
885 JavaThreadState state = _thread->thread_state(); | |
886 | |
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887 // Save the state at the start of safepoint processing. |
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888 _orig_thread_state = state; |
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889 |
0 | 890 // Check for a thread that is suspended. Note that thread resume tries |
891 // to grab the Threads_lock which we own here, so a thread cannot be | |
892 // resumed during safepoint synchronization. | |
893 | |
979 | 894 // We check to see if this thread is suspended without locking to |
895 // avoid deadlocking with a third thread that is waiting for this | |
896 // thread to be suspended. The third thread can notice the safepoint | |
897 // that we're trying to start at the beginning of its SR_lock->wait() | |
898 // call. If that happens, then the third thread will block on the | |
899 // safepoint while still holding the underlying SR_lock. We won't be | |
900 // able to get the SR_lock and we'll deadlock. | |
901 // | |
902 // We don't need to grab the SR_lock here for two reasons: | |
903 // 1) The suspend flags are both volatile and are set with an | |
904 // Atomic::cmpxchg() call so we should see the suspended | |
905 // state right away. | |
906 // 2) We're being called from the safepoint polling loop; if | |
907 // we don't see the suspended state on this iteration, then | |
908 // we'll come around again. | |
909 // | |
910 bool is_suspended = _thread->is_ext_suspended(); | |
0 | 911 if (is_suspended) { |
912 roll_forward(_at_safepoint); | |
913 return; | |
914 } | |
915 | |
916 // Some JavaThread states have an initial safepoint state of | |
917 // running, but are actually at a safepoint. We will happily | |
918 // agree and update the safepoint state here. | |
919 if (SafepointSynchronize::safepoint_safe(_thread, state)) { | |
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920 SafepointSynchronize::check_for_lazy_critical_native(_thread, state); |
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921 roll_forward(_at_safepoint); |
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922 return; |
0 | 923 } |
924 | |
925 if (state == _thread_in_vm) { | |
926 roll_forward(_call_back); | |
927 return; | |
928 } | |
929 | |
930 // All other thread states will continue to run until they | |
931 // transition and self-block in state _blocked | |
932 // Safepoint polling in compiled code causes the Java threads to do the same. | |
933 // Note: new threads may require a malloc so they must be allowed to finish | |
934 | |
935 assert(is_running(), "examine_state_of_thread on non-running thread"); | |
936 return; | |
937 } | |
938 | |
939 // Returns true is thread could not be rolled forward at present position. | |
940 void ThreadSafepointState::roll_forward(suspend_type type) { | |
941 _type = type; | |
942 | |
943 switch(_type) { | |
944 case _at_safepoint: | |
945 SafepointSynchronize::signal_thread_at_safepoint(); | |
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946 DEBUG_ONLY(_thread->set_visited_for_critical_count(true)); |
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947 if (_thread->in_critical()) { |
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948 // Notice that this thread is in a critical section |
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949 SafepointSynchronize::increment_jni_active_count(); |
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950 } |
0 | 951 break; |
952 | |
953 case _call_back: | |
954 set_has_called_back(false); | |
955 break; | |
956 | |
957 case _running: | |
958 default: | |
959 ShouldNotReachHere(); | |
960 } | |
961 } | |
962 | |
963 void ThreadSafepointState::restart() { | |
964 switch(type()) { | |
965 case _at_safepoint: | |
966 case _call_back: | |
967 break; | |
968 | |
969 case _running: | |
970 default: | |
971 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d", | |
972 _thread, _type); | |
973 _thread->print(); | |
974 ShouldNotReachHere(); | |
975 } | |
976 _type = _running; | |
977 set_has_called_back(false); | |
978 } | |
979 | |
980 | |
981 void ThreadSafepointState::print_on(outputStream *st) const { | |
982 const char *s; | |
983 | |
984 switch(_type) { | |
985 case _running : s = "_running"; break; | |
986 case _at_safepoint : s = "_at_safepoint"; break; | |
987 case _call_back : s = "_call_back"; break; | |
988 default: | |
989 ShouldNotReachHere(); | |
990 } | |
991 | |
992 st->print_cr("Thread: " INTPTR_FORMAT | |
993 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d", | |
994 _thread, _thread->osthread()->thread_id(), s, _has_called_back, | |
995 _at_poll_safepoint); | |
996 | |
997 _thread->print_thread_state_on(st); | |
998 } | |
999 | |
1000 | |
1001 // --------------------------------------------------------------------------------------------------------------------- | |
1002 | |
1003 // Block the thread at the safepoint poll or poll return. | |
1004 void ThreadSafepointState::handle_polling_page_exception() { | |
1005 | |
1006 // Check state. block() will set thread state to thread_in_vm which will | |
1007 // cause the safepoint state _type to become _call_back. | |
1008 assert(type() == ThreadSafepointState::_running, | |
1009 "polling page exception on thread not running state"); | |
1010 | |
1011 // Step 1: Find the nmethod from the return address | |
1012 if (ShowSafepointMsgs && Verbose) { | |
1013 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc()); | |
1014 } | |
1015 address real_return_addr = thread()->saved_exception_pc(); | |
1016 | |
1017 CodeBlob *cb = CodeCache::find_blob(real_return_addr); | |
1018 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod"); | |
1019 nmethod* nm = (nmethod*)cb; | |
1020 | |
1021 // Find frame of caller | |
1022 frame stub_fr = thread()->last_frame(); | |
1023 CodeBlob* stub_cb = stub_fr.cb(); | |
1024 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub"); | |
1025 RegisterMap map(thread(), true); | |
1026 frame caller_fr = stub_fr.sender(&map); | |
1027 | |
1028 // Should only be poll_return or poll | |
1029 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" ); | |
1030 | |
1031 // This is a poll immediately before a return. The exception handling code | |
1032 // has already had the effect of causing the return to occur, so the execution | |
1033 // will continue immediately after the call. In addition, the oopmap at the | |
1034 // return point does not mark the return value as an oop (if it is), so | |
1035 // it needs a handle here to be updated. | |
1036 if( nm->is_at_poll_return(real_return_addr) ) { | |
1037 // See if return type is an oop. | |
1038 bool return_oop = nm->method()->is_returning_oop(); | |
1039 Handle return_value; | |
1040 if (return_oop) { | |
1041 // The oop result has been saved on the stack together with all | |
1042 // the other registers. In order to preserve it over GCs we need | |
1043 // to keep it in a handle. | |
1044 oop result = caller_fr.saved_oop_result(&map); | |
1045 assert(result == NULL || result->is_oop(), "must be oop"); | |
1046 return_value = Handle(thread(), result); | |
1047 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); | |
1048 } | |
1049 | |
1050 // Block the thread | |
1051 SafepointSynchronize::block(thread()); | |
1052 | |
1053 // restore oop result, if any | |
1054 if (return_oop) { | |
1055 caller_fr.set_saved_oop_result(&map, return_value()); | |
1056 } | |
1057 } | |
1058 | |
1059 // This is a safepoint poll. Verify the return address and block. | |
1060 else { | |
1061 set_at_poll_safepoint(true); | |
1062 | |
1063 // verify the blob built the "return address" correctly | |
1064 assert(real_return_addr == caller_fr.pc(), "must match"); | |
1065 | |
1066 // Block the thread | |
1067 SafepointSynchronize::block(thread()); | |
1068 set_at_poll_safepoint(false); | |
1069 | |
1070 // If we have a pending async exception deoptimize the frame | |
1071 // as otherwise we may never deliver it. | |
1072 if (thread()->has_async_condition()) { | |
1073 ThreadInVMfromJavaNoAsyncException __tiv(thread()); | |
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1074 Deoptimization::deoptimize_frame(thread(), caller_fr.id()); |
0 | 1075 } |
1076 | |
1077 // If an exception has been installed we must check for a pending deoptimization | |
1078 // Deoptimize frame if exception has been thrown. | |
1079 | |
1080 if (thread()->has_pending_exception() ) { | |
1081 RegisterMap map(thread(), true); | |
1082 frame caller_fr = stub_fr.sender(&map); | |
1083 if (caller_fr.is_deoptimized_frame()) { | |
1084 // The exception patch will destroy registers that are still | |
1085 // live and will be needed during deoptimization. Defer the | |
1086 // Async exception should have defered the exception until the | |
1087 // next safepoint which will be detected when we get into | |
1088 // the interpreter so if we have an exception now things | |
1089 // are messed up. | |
1090 | |
1091 fatal("Exception installed and deoptimization is pending"); | |
1092 } | |
1093 } | |
1094 } | |
1095 } | |
1096 | |
1097 | |
1098 // | |
1099 // Statistics & Instrumentations | |
1100 // | |
1101 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL; | |
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1102 jlong SafepointSynchronize::_safepoint_begin_time = 0; |
0 | 1103 int SafepointSynchronize::_cur_stat_index = 0; |
1104 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating]; | |
1105 julong SafepointSynchronize::_coalesced_vmop_count = 0; | |
1106 jlong SafepointSynchronize::_max_sync_time = 0; | |
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1107 jlong SafepointSynchronize::_max_vmop_time = 0; |
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1108 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f; |
0 | 1109 |
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1110 static jlong cleanup_end_time = 0; |
0 | 1111 static bool need_to_track_page_armed_status = false; |
1112 static bool init_done = false; | |
1113 | |
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1114 // Helper method to print the header. |
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1115 static void print_header() { |
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1116 tty->print(" vmop " |
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1117 "[threads: total initially_running wait_to_block] "); |
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1118 tty->print("[time: spin block sync cleanup vmop] "); |
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1119 |
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1120 // no page armed status printed out if it is always armed. |
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1121 if (need_to_track_page_armed_status) { |
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1122 tty->print("page_armed "); |
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1123 } |
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1124 |
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1125 tty->print_cr("page_trap_count"); |
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1126 } |
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1127 |
0 | 1128 void SafepointSynchronize::deferred_initialize_stat() { |
1129 if (init_done) return; | |
1130 | |
1131 if (PrintSafepointStatisticsCount <= 0) { | |
1132 fatal("Wrong PrintSafepointStatisticsCount"); | |
1133 } | |
1134 | |
1135 // If PrintSafepointStatisticsTimeout is specified, the statistics data will | |
1136 // be printed right away, in which case, _safepoint_stats will regress to | |
1137 // a single element array. Otherwise, it is a circular ring buffer with default | |
1138 // size of PrintSafepointStatisticsCount. | |
1139 int stats_array_size; | |
1140 if (PrintSafepointStatisticsTimeout > 0) { | |
1141 stats_array_size = 1; | |
1142 PrintSafepointStatistics = true; | |
1143 } else { | |
1144 stats_array_size = PrintSafepointStatisticsCount; | |
1145 } | |
1146 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size | |
1147 * sizeof(SafepointStats)); | |
1148 guarantee(_safepoint_stats != NULL, | |
1149 "not enough memory for safepoint instrumentation data"); | |
1150 | |
1151 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) { | |
1152 need_to_track_page_armed_status = true; | |
1153 } | |
1154 init_done = true; | |
1155 } | |
1156 | |
1157 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) { | |
1003 | 1158 assert(init_done, "safepoint statistics array hasn't been initialized"); |
0 | 1159 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
1160 | |
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1161 spstat->_time_stamp = _ts_of_current_safepoint; |
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1162 |
0 | 1163 VM_Operation *op = VMThread::vm_operation(); |
1164 spstat->_vmop_type = (op != NULL ? op->type() : -1); | |
1165 if (op != NULL) { | |
1166 _safepoint_reasons[spstat->_vmop_type]++; | |
1167 } | |
1168 | |
1169 spstat->_nof_total_threads = nof_threads; | |
1170 spstat->_nof_initial_running_threads = nof_running; | |
1171 spstat->_nof_threads_hit_page_trap = 0; | |
1172 | |
1173 // Records the start time of spinning. The real time spent on spinning | |
1174 // will be adjusted when spin is done. Same trick is applied for time | |
1175 // spent on waiting for threads to block. | |
1176 if (nof_running != 0) { | |
1177 spstat->_time_to_spin = os::javaTimeNanos(); | |
1178 } else { | |
1179 spstat->_time_to_spin = 0; | |
1180 } | |
1181 } | |
1182 | |
1183 void SafepointSynchronize::update_statistics_on_spin_end() { | |
1184 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1185 | |
1186 jlong cur_time = os::javaTimeNanos(); | |
1187 | |
1188 spstat->_nof_threads_wait_to_block = _waiting_to_block; | |
1189 if (spstat->_nof_initial_running_threads != 0) { | |
1190 spstat->_time_to_spin = cur_time - spstat->_time_to_spin; | |
1191 } | |
1192 | |
1193 if (need_to_track_page_armed_status) { | |
1194 spstat->_page_armed = (PageArmed == 1); | |
1195 } | |
1196 | |
1197 // Records the start time of waiting for to block. Updated when block is done. | |
1198 if (_waiting_to_block != 0) { | |
1199 spstat->_time_to_wait_to_block = cur_time; | |
1200 } else { | |
1201 spstat->_time_to_wait_to_block = 0; | |
1202 } | |
1203 } | |
1204 | |
1205 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) { | |
1206 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1207 | |
1208 if (spstat->_nof_threads_wait_to_block != 0) { | |
1209 spstat->_time_to_wait_to_block = end_time - | |
1210 spstat->_time_to_wait_to_block; | |
1211 } | |
1212 | |
1213 // Records the end time of sync which will be used to calculate the total | |
1214 // vm operation time. Again, the real time spending in syncing will be deducted | |
1215 // from the start of the sync time later when end_statistics is called. | |
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1216 spstat->_time_to_sync = end_time - _safepoint_begin_time; |
0 | 1217 if (spstat->_time_to_sync > _max_sync_time) { |
1218 _max_sync_time = spstat->_time_to_sync; | |
1219 } | |
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1220 |
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1221 spstat->_time_to_do_cleanups = end_time; |
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1222 } |
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1223 |
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1224 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) { |
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1225 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
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1226 |
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1227 // Record how long spent in cleanup tasks. |
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1228 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups; |
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1229 |
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1230 cleanup_end_time = end_time; |
0 | 1231 } |
1232 | |
1233 void SafepointSynchronize::end_statistics(jlong vmop_end_time) { | |
1234 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1235 | |
1236 // Update the vm operation time. | |
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1237 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time; |
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1238 if (spstat->_time_to_exec_vmop > _max_vmop_time) { |
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1239 _max_vmop_time = spstat->_time_to_exec_vmop; |
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1240 } |
0 | 1241 // Only the sync time longer than the specified |
1242 // PrintSafepointStatisticsTimeout will be printed out right away. | |
1243 // By default, it is -1 meaning all samples will be put into the list. | |
1244 if ( PrintSafepointStatisticsTimeout > 0) { | |
1245 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1246 print_statistics(); | |
1247 } | |
1248 } else { | |
1249 // The safepoint statistics will be printed out when the _safepoin_stats | |
1250 // array fills up. | |
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1251 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) { |
0 | 1252 print_statistics(); |
1253 _cur_stat_index = 0; | |
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1254 } else { |
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1255 _cur_stat_index++; |
0 | 1256 } |
1257 } | |
1258 } | |
1259 | |
1260 void SafepointSynchronize::print_statistics() { | |
1261 SafepointStats* sstats = _safepoint_stats; | |
1262 | |
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1263 for (int index = 0; index <= _cur_stat_index; index++) { |
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1264 if (index % 30 == 0) { |
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1265 print_header(); |
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1266 } |
0 | 1267 sstats = &_safepoint_stats[index]; |
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1268 tty->print("%.3f: ", sstats->_time_stamp); |
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1269 tty->print("%-26s [" |
0 | 1270 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15) |
1291
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1271 " ] ", |
0 | 1272 sstats->_vmop_type == -1 ? "no vm operation" : |
1273 VM_Operation::name(sstats->_vmop_type), | |
1274 sstats->_nof_total_threads, | |
1275 sstats->_nof_initial_running_threads, | |
1276 sstats->_nof_threads_wait_to_block); | |
1277 // "/ MICROUNITS " is to convert the unit from nanos to millis. | |
1291
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1278 tty->print(" [" |
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1279 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1280 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1281 INT64_FORMAT_W(6)" ] ", |
0 | 1282 sstats->_time_to_spin / MICROUNITS, |
1283 sstats->_time_to_wait_to_block / MICROUNITS, | |
1284 sstats->_time_to_sync / MICROUNITS, | |
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1285 sstats->_time_to_do_cleanups / MICROUNITS, |
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1286 sstats->_time_to_exec_vmop / MICROUNITS); |
0 | 1287 |
1288 if (need_to_track_page_armed_status) { | |
1289 tty->print(INT32_FORMAT" ", sstats->_page_armed); | |
1290 } | |
1291 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap); | |
1292 } | |
1293 } | |
1294 | |
1295 // This method will be called when VM exits. It will first call | |
1296 // print_statistics to print out the rest of the sampling. Then | |
1297 // it tries to summarize the sampling. | |
1298 void SafepointSynchronize::print_stat_on_exit() { | |
1299 if (_safepoint_stats == NULL) return; | |
1300 | |
1301 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1302 | |
1303 // During VM exit, end_statistics may not get called and in that | |
1304 // case, if the sync time is less than PrintSafepointStatisticsTimeout, | |
1305 // don't print it out. | |
1306 // Approximate the vm op time. | |
1307 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop = | |
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1308 os::javaTimeNanos() - cleanup_end_time; |
0 | 1309 |
1310 if ( PrintSafepointStatisticsTimeout < 0 || | |
1311 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1312 print_statistics(); | |
1313 } | |
1314 tty->print_cr(""); | |
1315 | |
1316 // Print out polling page sampling status. | |
1317 if (!need_to_track_page_armed_status) { | |
1318 if (UseCompilerSafepoints) { | |
1319 tty->print_cr("Polling page always armed"); | |
1320 } | |
1321 } else { | |
1322 tty->print_cr("Defer polling page loop count = %d\n", | |
1323 DeferPollingPageLoopCount); | |
1324 } | |
1325 | |
1326 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) { | |
1327 if (_safepoint_reasons[index] != 0) { | |
1328 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index), | |
1329 _safepoint_reasons[index]); | |
1330 } | |
1331 } | |
1332 | |
1333 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint", | |
1334 _coalesced_vmop_count); | |
1335 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms", | |
1336 _max_sync_time / MICROUNITS); | |
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1337 tty->print_cr("Maximum vm operation time (except for Exit VM operation) " |
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1338 INT64_FORMAT_W(5)" ms", |
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1339 _max_vmop_time / MICROUNITS); |
0 | 1340 } |
1341 | |
1342 // ------------------------------------------------------------------------------------------------ | |
1343 // Non-product code | |
1344 | |
1345 #ifndef PRODUCT | |
1346 | |
1347 void SafepointSynchronize::print_state() { | |
1348 if (_state == _not_synchronized) { | |
1349 tty->print_cr("not synchronized"); | |
1350 } else if (_state == _synchronizing || _state == _synchronized) { | |
1351 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" : | |
1352 "synchronized"); | |
1353 | |
1354 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
1355 cur->safepoint_state()->print(); | |
1356 } | |
1357 } | |
1358 } | |
1359 | |
1360 void SafepointSynchronize::safepoint_msg(const char* format, ...) { | |
1361 if (ShowSafepointMsgs) { | |
1362 va_list ap; | |
1363 va_start(ap, format); | |
1364 tty->vprint_cr(format, ap); | |
1365 va_end(ap); | |
1366 } | |
1367 } | |
1368 | |
1369 #endif // !PRODUCT |