Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/safepoint.cpp @ 6166:58ad5f22317e
Merge
author | sla |
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date | Mon, 18 Jun 2012 11:33:17 +0200 |
parents | e9140bf80b4a |
children | d2a62e0f25eb |
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" |
6162 | 26 #include "classfile/symbolTable.hpp" |
1972 | 27 #include "classfile/systemDictionary.hpp" |
28 #include "code/codeCache.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/nmethod.hpp" | |
31 #include "code/pcDesc.hpp" | |
32 #include "code/scopeDesc.hpp" | |
33 #include "gc_interface/collectedHeap.hpp" | |
34 #include "interpreter/interpreter.hpp" | |
35 #include "memory/resourceArea.hpp" | |
36 #include "memory/universe.inline.hpp" | |
37 #include "oops/oop.inline.hpp" | |
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38 #include "oops/symbol.hpp" |
1972 | 39 #include "runtime/compilationPolicy.hpp" |
40 #include "runtime/deoptimization.hpp" | |
41 #include "runtime/frame.inline.hpp" | |
42 #include "runtime/interfaceSupport.hpp" | |
43 #include "runtime/mutexLocker.hpp" | |
44 #include "runtime/osThread.hpp" | |
45 #include "runtime/safepoint.hpp" | |
46 #include "runtime/signature.hpp" | |
47 #include "runtime/stubCodeGenerator.hpp" | |
48 #include "runtime/stubRoutines.hpp" | |
49 #include "runtime/sweeper.hpp" | |
50 #include "runtime/synchronizer.hpp" | |
51 #include "services/runtimeService.hpp" | |
52 #include "utilities/events.hpp" | |
53 #ifdef TARGET_ARCH_x86 | |
54 # include "nativeInst_x86.hpp" | |
55 # include "vmreg_x86.inline.hpp" | |
56 #endif | |
57 #ifdef TARGET_ARCH_sparc | |
58 # include "nativeInst_sparc.hpp" | |
59 # include "vmreg_sparc.inline.hpp" | |
60 #endif | |
61 #ifdef TARGET_ARCH_zero | |
62 # include "nativeInst_zero.hpp" | |
63 # include "vmreg_zero.inline.hpp" | |
64 #endif | |
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65 #ifdef TARGET_ARCH_arm |
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66 # include "nativeInst_arm.hpp" |
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67 # include "vmreg_arm.inline.hpp" |
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68 #endif |
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69 #ifdef TARGET_ARCH_ppc |
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70 # include "nativeInst_ppc.hpp" |
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71 # include "vmreg_ppc.inline.hpp" |
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72 #endif |
1972 | 73 #ifdef TARGET_OS_FAMILY_linux |
74 # include "thread_linux.inline.hpp" | |
75 #endif | |
76 #ifdef TARGET_OS_FAMILY_solaris | |
77 # include "thread_solaris.inline.hpp" | |
78 #endif | |
79 #ifdef TARGET_OS_FAMILY_windows | |
80 # include "thread_windows.inline.hpp" | |
81 #endif | |
3960 | 82 #ifdef TARGET_OS_FAMILY_bsd |
83 # include "thread_bsd.inline.hpp" | |
84 #endif | |
1972 | 85 #ifndef SERIALGC |
86 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
87 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
88 #endif | |
89 #ifdef COMPILER1 | |
90 #include "c1/c1_globals.hpp" | |
91 #endif | |
0 | 92 |
93 // -------------------------------------------------------------------------------------------------- | |
94 // Implementation of Safepoint begin/end | |
95 | |
96 SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized; | |
97 volatile int SafepointSynchronize::_waiting_to_block = 0; | |
98 volatile int SafepointSynchronize::_safepoint_counter = 0; | |
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99 int SafepointSynchronize::_current_jni_active_count = 0; |
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100 long SafepointSynchronize::_end_of_last_safepoint = 0; |
0 | 101 static volatile int PageArmed = 0 ; // safepoint polling page is RO|RW vs PROT_NONE |
102 static volatile int TryingToBlock = 0 ; // proximate value -- for advisory use only | |
103 static bool timeout_error_printed = false; | |
104 | |
105 // Roll all threads forward to a safepoint and suspend them all | |
106 void SafepointSynchronize::begin() { | |
107 | |
108 Thread* myThread = Thread::current(); | |
109 assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint"); | |
110 | |
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111 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { |
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112 _safepoint_begin_time = os::javaTimeNanos(); |
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113 _ts_of_current_safepoint = tty->time_stamp().seconds(); |
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114 } |
0 | 115 |
116 #ifndef SERIALGC | |
117 if (UseConcMarkSweepGC) { | |
118 // In the future we should investigate whether CMS can use the | |
119 // more-general mechanism below. DLD (01/05). | |
120 ConcurrentMarkSweepThread::synchronize(false); | |
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121 } else if (UseG1GC) { |
0 | 122 ConcurrentGCThread::safepoint_synchronize(); |
123 } | |
124 #endif // SERIALGC | |
125 | |
126 // By getting the Threads_lock, we assure that no threads are about to start or | |
127 // exit. It is released again in SafepointSynchronize::end(). | |
128 Threads_lock->lock(); | |
129 | |
130 assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state"); | |
131 | |
132 int nof_threads = Threads::number_of_threads(); | |
133 | |
134 if (TraceSafepoint) { | |
135 tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads); | |
136 } | |
137 | |
138 RuntimeService::record_safepoint_begin(); | |
139 | |
140 MutexLocker mu(Safepoint_lock); | |
141 | |
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142 // Reset the count of active JNI critical threads |
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143 _current_jni_active_count = 0; |
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144 |
0 | 145 // Set number of threads to wait for, before we initiate the callbacks |
146 _waiting_to_block = nof_threads; | |
147 TryingToBlock = 0 ; | |
148 int still_running = nof_threads; | |
149 | |
150 // Save the starting time, so that it can be compared to see if this has taken | |
151 // too long to complete. | |
152 jlong safepoint_limit_time; | |
153 timeout_error_printed = false; | |
154 | |
1003 | 155 // PrintSafepointStatisticsTimeout can be specified separately. When |
156 // specified, PrintSafepointStatistics will be set to true in | |
157 // deferred_initialize_stat method. The initialization has to be done | |
158 // early enough to avoid any races. See bug 6880029 for details. | |
159 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { | |
160 deferred_initialize_stat(); | |
161 } | |
162 | |
0 | 163 // Begin the process of bringing the system to a safepoint. |
164 // Java threads can be in several different states and are | |
165 // stopped by different mechanisms: | |
166 // | |
167 // 1. Running interpreted | |
168 // The interpeter dispatch table is changed to force it to | |
169 // check for a safepoint condition between bytecodes. | |
170 // 2. Running in native code | |
171 // When returning from the native code, a Java thread must check | |
172 // the safepoint _state to see if we must block. If the | |
173 // VM thread sees a Java thread in native, it does | |
174 // not wait for this thread to block. The order of the memory | |
175 // writes and reads of both the safepoint state and the Java | |
176 // threads state is critical. In order to guarantee that the | |
177 // memory writes are serialized with respect to each other, | |
178 // the VM thread issues a memory barrier instruction | |
179 // (on MP systems). In order to avoid the overhead of issuing | |
180 // a memory barrier for each Java thread making native calls, each Java | |
181 // thread performs a write to a single memory page after changing | |
182 // the thread state. The VM thread performs a sequence of | |
183 // mprotect OS calls which forces all previous writes from all | |
184 // Java threads to be serialized. This is done in the | |
185 // os::serialize_thread_states() call. This has proven to be | |
186 // much more efficient than executing a membar instruction | |
187 // on every call to native code. | |
188 // 3. Running compiled Code | |
189 // Compiled code reads a global (Safepoint Polling) page that | |
190 // is set to fault if we are trying to get to a safepoint. | |
191 // 4. Blocked | |
192 // A thread which is blocked will not be allowed to return from the | |
193 // block condition until the safepoint operation is complete. | |
194 // 5. In VM or Transitioning between states | |
195 // If a Java thread is currently running in the VM or transitioning | |
196 // between states, the safepointing code will wait for the thread to | |
197 // block itself when it attempts transitions to a new state. | |
198 // | |
199 _state = _synchronizing; | |
200 OrderAccess::fence(); | |
201 | |
202 // Flush all thread states to memory | |
203 if (!UseMembar) { | |
204 os::serialize_thread_states(); | |
205 } | |
206 | |
207 // Make interpreter safepoint aware | |
208 Interpreter::notice_safepoints(); | |
209 | |
210 if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) { | |
211 // Make polling safepoint aware | |
212 guarantee (PageArmed == 0, "invariant") ; | |
213 PageArmed = 1 ; | |
214 os::make_polling_page_unreadable(); | |
215 } | |
216 | |
217 // Consider using active_processor_count() ... but that call is expensive. | |
218 int ncpus = os::processor_count() ; | |
219 | |
220 #ifdef ASSERT | |
221 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
222 assert(cur->safepoint_state()->is_running(), "Illegal initial state"); | |
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223 // Clear the visited flag to ensure that the critical counts are collected properly. |
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224 cur->set_visited_for_critical_count(false); |
0 | 225 } |
226 #endif // ASSERT | |
227 | |
228 if (SafepointTimeout) | |
229 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS; | |
230 | |
231 // Iterate through all threads until it have been determined how to stop them all at a safepoint | |
232 unsigned int iterations = 0; | |
233 int steps = 0 ; | |
234 while(still_running > 0) { | |
235 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
236 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended"); | |
237 ThreadSafepointState *cur_state = cur->safepoint_state(); | |
238 if (cur_state->is_running()) { | |
239 cur_state->examine_state_of_thread(); | |
240 if (!cur_state->is_running()) { | |
241 still_running--; | |
242 // consider adjusting steps downward: | |
243 // steps = 0 | |
244 // steps -= NNN | |
245 // steps >>= 1 | |
246 // steps = MIN(steps, 2000-100) | |
247 // if (iterations != 0) steps -= NNN | |
248 } | |
249 if (TraceSafepoint && Verbose) cur_state->print(); | |
250 } | |
251 } | |
252 | |
1003 | 253 if (PrintSafepointStatistics && iterations == 0) { |
0 | 254 begin_statistics(nof_threads, still_running); |
255 } | |
256 | |
257 if (still_running > 0) { | |
258 // Check for if it takes to long | |
259 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) { | |
260 print_safepoint_timeout(_spinning_timeout); | |
261 } | |
262 | |
263 // Spin to avoid context switching. | |
264 // There's a tension between allowing the mutators to run (and rendezvous) | |
265 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that | |
266 // a mutator might otherwise use profitably to reach a safepoint. Excessive | |
267 // spinning by the VM thread on a saturated system can increase rendezvous latency. | |
268 // Blocking or yielding incur their own penalties in the form of context switching | |
269 // and the resultant loss of $ residency. | |
270 // | |
271 // Further complicating matters is that yield() does not work as naively expected | |
272 // on many platforms -- yield() does not guarantee that any other ready threads | |
273 // will run. As such we revert yield_all() after some number of iterations. | |
274 // Yield_all() is implemented as a short unconditional sleep on some platforms. | |
275 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping | |
276 // can actually increase the time it takes the VM thread to detect that a system-wide | |
277 // stop-the-world safepoint has been reached. In a pathological scenario such as that | |
278 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe. | |
279 // In that case the mutators will be stalled waiting for the safepoint to complete and the | |
280 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread | |
281 // will eventually wake up and detect that all mutators are safe, at which point | |
282 // we'll again make progress. | |
283 // | |
284 // Beware too that that the VMThread typically runs at elevated priority. | |
285 // Its default priority is higher than the default mutator priority. | |
286 // Obviously, this complicates spinning. | |
287 // | |
288 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0). | |
289 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will. | |
290 // | |
291 // See the comments in synchronizer.cpp for additional remarks on spinning. | |
292 // | |
293 // In the future we might: | |
294 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning. | |
295 // This is tricky as the path used by a thread exiting the JVM (say on | |
296 // on JNI call-out) simply stores into its state field. The burden | |
297 // is placed on the VM thread, which must poll (spin). | |
298 // 2. Find something useful to do while spinning. If the safepoint is GC-related | |
299 // we might aggressively scan the stacks of threads that are already safe. | |
300 // 3. Use Solaris schedctl to examine the state of the still-running mutators. | |
301 // If all the mutators are ONPROC there's no reason to sleep or yield. | |
302 // 4. YieldTo() any still-running mutators that are ready but OFFPROC. | |
303 // 5. Check system saturation. If the system is not fully saturated then | |
304 // simply spin and avoid sleep/yield. | |
305 // 6. As still-running mutators rendezvous they could unpark the sleeping | |
306 // VMthread. This works well for still-running mutators that become | |
307 // safe. The VMthread must still poll for mutators that call-out. | |
308 // 7. Drive the policy on time-since-begin instead of iterations. | |
309 // 8. Consider making the spin duration a function of the # of CPUs: | |
310 // Spin = (((ncpus-1) * M) + K) + F(still_running) | |
311 // Alternately, instead of counting iterations of the outer loop | |
312 // we could count the # of threads visited in the inner loop, above. | |
313 // 9. On windows consider using the return value from SwitchThreadTo() | |
314 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions. | |
315 | |
316 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) { | |
317 guarantee (PageArmed == 0, "invariant") ; | |
318 PageArmed = 1 ; | |
319 os::make_polling_page_unreadable(); | |
320 } | |
321 | |
322 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or | |
323 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus) | |
324 ++steps ; | |
325 if (ncpus > 1 && steps < SafepointSpinBeforeYield) { | |
326 SpinPause() ; // MP-Polite spin | |
327 } else | |
328 if (steps < DeferThrSuspendLoopCount) { | |
329 os::NakedYield() ; | |
330 } else { | |
331 os::yield_all(steps) ; | |
332 // Alternately, the VM thread could transiently depress its scheduling priority or | |
333 // transiently increase the priority of the tardy mutator(s). | |
334 } | |
335 | |
336 iterations ++ ; | |
337 } | |
338 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long"); | |
339 } | |
340 assert(still_running == 0, "sanity check"); | |
341 | |
342 if (PrintSafepointStatistics) { | |
343 update_statistics_on_spin_end(); | |
344 } | |
345 | |
346 // wait until all threads are stopped | |
347 while (_waiting_to_block > 0) { | |
348 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block); | |
349 if (!SafepointTimeout || timeout_error_printed) { | |
350 Safepoint_lock->wait(true); // true, means with no safepoint checks | |
351 } else { | |
352 // Compute remaining time | |
353 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos(); | |
354 | |
355 // If there is no remaining time, then there is an error | |
356 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) { | |
357 print_safepoint_timeout(_blocking_timeout); | |
358 } | |
359 } | |
360 } | |
361 assert(_waiting_to_block == 0, "sanity check"); | |
362 | |
363 #ifndef PRODUCT | |
364 if (SafepointTimeout) { | |
365 jlong current_time = os::javaTimeNanos(); | |
366 if (safepoint_limit_time < current_time) { | |
367 tty->print_cr("# SafepointSynchronize: Finished after " | |
368 INT64_FORMAT_W(6) " ms", | |
369 ((current_time - safepoint_limit_time) / MICROUNITS + | |
370 SafepointTimeoutDelay)); | |
371 } | |
372 } | |
373 #endif | |
374 | |
375 assert((_safepoint_counter & 0x1) == 0, "must be even"); | |
376 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
377 _safepoint_counter ++; | |
378 | |
379 // Record state | |
380 _state = _synchronized; | |
381 | |
382 OrderAccess::fence(); | |
383 | |
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384 #ifdef ASSERT |
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385 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { |
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386 // make sure all the threads were visited |
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387 assert(cur->was_visited_for_critical_count(), "missed a thread"); |
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388 } |
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389 #endif // ASSERT |
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390 |
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391 // Update the count of active JNI critical regions |
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392 GC_locker::set_jni_lock_count(_current_jni_active_count); |
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393 |
0 | 394 if (TraceSafepoint) { |
395 VM_Operation *op = VMThread::vm_operation(); | |
396 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation"); | |
397 } | |
398 | |
399 RuntimeService::record_safepoint_synchronized(); | |
400 if (PrintSafepointStatistics) { | |
401 update_statistics_on_sync_end(os::javaTimeNanos()); | |
402 } | |
403 | |
404 // Call stuff that needs to be run when a safepoint is just about to be completed | |
405 do_cleanup_tasks(); | |
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406 |
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407 if (PrintSafepointStatistics) { |
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408 // Record how much time spend on the above cleanup tasks |
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409 update_statistics_on_cleanup_end(os::javaTimeNanos()); |
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410 } |
0 | 411 } |
412 | |
413 // Wake up all threads, so they are ready to resume execution after the safepoint | |
414 // operation has been carried out | |
415 void SafepointSynchronize::end() { | |
416 | |
417 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
418 assert((_safepoint_counter & 0x1) == 1, "must be odd"); | |
419 _safepoint_counter ++; | |
420 // memory fence isn't required here since an odd _safepoint_counter | |
421 // value can do no harm and a fence is issued below anyway. | |
422 | |
423 DEBUG_ONLY(Thread* myThread = Thread::current();) | |
424 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint"); | |
425 | |
426 if (PrintSafepointStatistics) { | |
427 end_statistics(os::javaTimeNanos()); | |
428 } | |
429 | |
430 #ifdef ASSERT | |
431 // A pending_exception cannot be installed during a safepoint. The threads | |
432 // may install an async exception after they come back from a safepoint into | |
433 // pending_exception after they unblock. But that should happen later. | |
434 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
435 assert (!(cur->has_pending_exception() && | |
436 cur->safepoint_state()->is_at_poll_safepoint()), | |
437 "safepoint installed a pending exception"); | |
438 } | |
439 #endif // ASSERT | |
440 | |
441 if (PageArmed) { | |
442 // Make polling safepoint aware | |
443 os::make_polling_page_readable(); | |
444 PageArmed = 0 ; | |
445 } | |
446 | |
447 // Remove safepoint check from interpreter | |
448 Interpreter::ignore_safepoints(); | |
449 | |
450 { | |
451 MutexLocker mu(Safepoint_lock); | |
452 | |
453 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization"); | |
454 | |
455 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method | |
456 // when they get restarted. | |
457 _state = _not_synchronized; | |
458 OrderAccess::fence(); | |
459 | |
460 if (TraceSafepoint) { | |
461 tty->print_cr("Leaving safepoint region"); | |
462 } | |
463 | |
464 // Start suspended threads | |
465 for(JavaThread *current = Threads::first(); current; current = current->next()) { | |
605 | 466 // A problem occurring on Solaris is when attempting to restart threads |
0 | 467 // the first #cpus - 1 go well, but then the VMThread is preempted when we get |
468 // to the next one (since it has been running the longest). We then have | |
469 // to wait for a cpu to become available before we can continue restarting | |
470 // threads. | |
471 // FIXME: This causes the performance of the VM to degrade when active and with | |
472 // large numbers of threads. Apparently this is due to the synchronous nature | |
473 // of suspending threads. | |
474 // | |
475 // TODO-FIXME: the comments above are vestigial and no longer apply. | |
476 // Furthermore, using solaris' schedctl in this particular context confers no benefit | |
477 if (VMThreadHintNoPreempt) { | |
478 os::hint_no_preempt(); | |
479 } | |
480 ThreadSafepointState* cur_state = current->safepoint_state(); | |
481 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint"); | |
482 cur_state->restart(); | |
483 assert(cur_state->is_running(), "safepoint state has not been reset"); | |
484 } | |
485 | |
486 RuntimeService::record_safepoint_end(); | |
487 | |
488 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads | |
489 // blocked in signal_thread_blocked | |
490 Threads_lock->unlock(); | |
491 | |
492 } | |
493 #ifndef SERIALGC | |
494 // If there are any concurrent GC threads resume them. | |
495 if (UseConcMarkSweepGC) { | |
496 ConcurrentMarkSweepThread::desynchronize(false); | |
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497 } else if (UseG1GC) { |
0 | 498 ConcurrentGCThread::safepoint_desynchronize(); |
499 } | |
500 #endif // SERIALGC | |
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501 // record this time so VMThread can keep track how much time has elasped |
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502 // since last safepoint. |
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503 _end_of_last_safepoint = os::javaTimeMillis(); |
0 | 504 } |
505 | |
506 bool SafepointSynchronize::is_cleanup_needed() { | |
507 // Need a safepoint if some inline cache buffers is non-empty | |
508 if (!InlineCacheBuffer::is_empty()) return true; | |
509 return false; | |
510 } | |
511 | |
512 | |
513 | |
514 // Various cleaning tasks that should be done periodically at safepoints | |
515 void SafepointSynchronize::do_cleanup_tasks() { | |
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516 { |
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517 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); |
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518 ObjectSynchronizer::deflate_idle_monitors(); |
0 | 519 } |
520 | |
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521 { |
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522 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); |
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523 InlineCacheBuffer::update_inline_caches(); |
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524 } |
1783 | 525 { |
526 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime); | |
527 CompilationPolicy::policy()->do_safepoint_work(); | |
0 | 528 } |
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529 |
6162 | 530 { |
531 TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime); | |
532 NMethodSweeper::scan_stacks(); | |
533 } | |
534 | |
535 if (SymbolTable::needs_rehashing()) { | |
536 TraceTime t5("rehashing symbol table", TraceSafepointCleanupTime); | |
537 SymbolTable::rehash_table(); | |
538 } | |
539 | |
540 if (StringTable::needs_rehashing()) { | |
541 TraceTime t6("rehashing string table", TraceSafepointCleanupTime); | |
542 StringTable::rehash_table(); | |
543 } | |
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544 |
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545 // rotate log files? |
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546 if (UseGCLogFileRotation) { |
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547 gclog_or_tty->rotate_log(); |
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548 } |
0 | 549 } |
550 | |
551 | |
552 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) { | |
553 switch(state) { | |
554 case _thread_in_native: | |
555 // native threads are safe if they have no java stack or have walkable stack | |
556 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable(); | |
557 | |
558 // blocked threads should have already have walkable stack | |
559 case _thread_blocked: | |
560 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable"); | |
561 return true; | |
562 | |
563 default: | |
564 return false; | |
565 } | |
566 } | |
567 | |
568 | |
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569 // See if the thread is running inside a lazy critical native and |
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570 // update the thread critical count if so. Also set a suspend flag to |
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571 // cause the native wrapper to return into the JVM to do the unlock |
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572 // once the native finishes. |
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573 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) { |
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574 if (state == _thread_in_native && |
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575 thread->has_last_Java_frame() && |
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576 thread->frame_anchor()->walkable()) { |
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577 // This thread might be in a critical native nmethod so look at |
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578 // the top of the stack and increment the critical count if it |
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579 // is. |
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580 frame wrapper_frame = thread->last_frame(); |
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581 CodeBlob* stub_cb = wrapper_frame.cb(); |
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582 if (stub_cb != NULL && |
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583 stub_cb->is_nmethod() && |
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584 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) { |
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585 // A thread could potentially be in a critical native across |
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586 // more than one safepoint, so only update the critical state on |
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587 // the first one. When it returns it will perform the unlock. |
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588 if (!thread->do_critical_native_unlock()) { |
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589 #ifdef ASSERT |
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590 if (!thread->in_critical()) { |
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591 GC_locker::increment_debug_jni_lock_count(); |
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592 } |
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593 #endif |
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594 thread->enter_critical(); |
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595 // Make sure the native wrapper calls back on return to |
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596 // perform the needed critical unlock. |
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597 thread->set_critical_native_unlock(); |
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598 } |
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599 } |
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600 } |
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601 } |
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602 |
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603 |
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604 |
0 | 605 // ------------------------------------------------------------------------------------------------------- |
606 // Implementation of Safepoint callback point | |
607 | |
608 void SafepointSynchronize::block(JavaThread *thread) { | |
609 assert(thread != NULL, "thread must be set"); | |
610 assert(thread->is_Java_thread(), "not a Java thread"); | |
611 | |
612 // Threads shouldn't block if they are in the middle of printing, but... | |
613 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id()); | |
614 | |
615 // Only bail from the block() call if the thread is gone from the | |
616 // thread list; starting to exit should still block. | |
617 if (thread->is_terminated()) { | |
618 // block current thread if we come here from native code when VM is gone | |
619 thread->block_if_vm_exited(); | |
620 | |
621 // otherwise do nothing | |
622 return; | |
623 } | |
624 | |
625 JavaThreadState state = thread->thread_state(); | |
626 thread->frame_anchor()->make_walkable(thread); | |
627 | |
628 // Check that we have a valid thread_state at this point | |
629 switch(state) { | |
630 case _thread_in_vm_trans: | |
631 case _thread_in_Java: // From compiled code | |
632 | |
633 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case, | |
634 // we pretend we are still in the VM. | |
635 thread->set_thread_state(_thread_in_vm); | |
636 | |
637 if (is_synchronizing()) { | |
638 Atomic::inc (&TryingToBlock) ; | |
639 } | |
640 | |
641 // We will always be holding the Safepoint_lock when we are examine the state | |
642 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and | |
643 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code | |
644 Safepoint_lock->lock_without_safepoint_check(); | |
645 if (is_synchronizing()) { | |
646 // Decrement the number of threads to wait for and signal vm thread | |
647 assert(_waiting_to_block > 0, "sanity check"); | |
648 _waiting_to_block--; | |
649 thread->safepoint_state()->set_has_called_back(true); | |
650 | |
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651 DEBUG_ONLY(thread->set_visited_for_critical_count(true)); |
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652 if (thread->in_critical()) { |
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653 // Notice that this thread is in a critical section |
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654 increment_jni_active_count(); |
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655 } |
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656 |
0 | 657 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread |
658 if (_waiting_to_block == 0) { | |
659 Safepoint_lock->notify_all(); | |
660 } | |
661 } | |
662 | |
663 // We transition the thread to state _thread_blocked here, but | |
664 // we can't do our usual check for external suspension and then | |
665 // self-suspend after the lock_without_safepoint_check() call | |
666 // below because we are often called during transitions while | |
667 // we hold different locks. That would leave us suspended while | |
668 // holding a resource which results in deadlocks. | |
669 thread->set_thread_state(_thread_blocked); | |
670 Safepoint_lock->unlock(); | |
671 | |
672 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during | |
673 // the entire safepoint, the threads will all line up here during the safepoint. | |
674 Threads_lock->lock_without_safepoint_check(); | |
675 // restore original state. This is important if the thread comes from compiled code, so it | |
676 // will continue to execute with the _thread_in_Java state. | |
677 thread->set_thread_state(state); | |
678 Threads_lock->unlock(); | |
679 break; | |
680 | |
681 case _thread_in_native_trans: | |
682 case _thread_blocked_trans: | |
683 case _thread_new_trans: | |
684 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) { | |
685 thread->print_thread_state(); | |
686 fatal("Deadlock in safepoint code. " | |
687 "Should have called back to the VM before blocking."); | |
688 } | |
689 | |
690 // We transition the thread to state _thread_blocked here, but | |
691 // we can't do our usual check for external suspension and then | |
692 // self-suspend after the lock_without_safepoint_check() call | |
693 // below because we are often called during transitions while | |
694 // we hold different locks. That would leave us suspended while | |
695 // holding a resource which results in deadlocks. | |
696 thread->set_thread_state(_thread_blocked); | |
697 | |
698 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence, | |
699 // the safepoint code might still be waiting for it to block. We need to change the state here, | |
700 // so it can see that it is at a safepoint. | |
701 | |
702 // Block until the safepoint operation is completed. | |
703 Threads_lock->lock_without_safepoint_check(); | |
704 | |
705 // Restore state | |
706 thread->set_thread_state(state); | |
707 | |
708 Threads_lock->unlock(); | |
709 break; | |
710 | |
711 default: | |
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712 fatal(err_msg("Illegal threadstate encountered: %d", state)); |
0 | 713 } |
714 | |
715 // Check for pending. async. exceptions or suspends - except if the | |
716 // thread was blocked inside the VM. has_special_runtime_exit_condition() | |
717 // is called last since it grabs a lock and we only want to do that when | |
718 // we must. | |
719 // | |
720 // Note: we never deliver an async exception at a polling point as the | |
721 // compiler may not have an exception handler for it. The polling | |
722 // code will notice the async and deoptimize and the exception will | |
723 // be delivered. (Polling at a return point is ok though). Sure is | |
724 // a lot of bother for a deprecated feature... | |
725 // | |
726 // We don't deliver an async exception if the thread state is | |
727 // _thread_in_native_trans so JNI functions won't be called with | |
728 // a surprising pending exception. If the thread state is going back to java, | |
729 // async exception is checked in check_special_condition_for_native_trans(). | |
730 | |
731 if (state != _thread_blocked_trans && | |
732 state != _thread_in_vm_trans && | |
733 thread->has_special_runtime_exit_condition()) { | |
734 thread->handle_special_runtime_exit_condition( | |
735 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans)); | |
736 } | |
737 } | |
738 | |
739 // ------------------------------------------------------------------------------------------------------ | |
740 // Exception handlers | |
741 | |
742 #ifndef PRODUCT | |
743 #ifdef _LP64 | |
744 #define PTR_PAD "" | |
745 #else | |
746 #define PTR_PAD " " | |
747 #endif | |
748 | |
749 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) { | |
750 bool is_oop = newptr ? ((oop)newptr)->is_oop() : false; | |
751 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s", | |
752 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
753 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
754 } | |
755 | |
756 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) { | |
757 bool is_oop = newptr ? ((oop)(intptr_t)newptr)->is_oop() : false; | |
758 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s", | |
759 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
760 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
761 } | |
762 | |
763 #ifdef SPARC | |
764 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) { | |
765 #ifdef _LP64 | |
766 tty->print_cr("--------+------address-----+------before-----------+-------after----------+"); | |
767 const int incr = 1; // Increment to skip a long, in units of intptr_t | |
768 #else | |
769 tty->print_cr("--------+--address-+------before-----------+-------after----------+"); | |
770 const int incr = 2; // Increment to skip a long, in units of intptr_t | |
771 #endif | |
772 tty->print_cr("---SP---|"); | |
773 for( int i=0; i<16; i++ ) { | |
774 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
775 tty->print_cr("--------|"); | |
776 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) { | |
777 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
778 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); | |
779 tty->print_cr("--------|"); | |
780 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; | |
781 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; | |
782 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; | |
783 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; | |
784 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp); | |
785 old_sp += incr; new_sp += incr; was_oops += incr; | |
786 // Skip the floats | |
787 tty->print_cr("--Float-|"PTR_FORMAT,new_sp); | |
788 tty->print_cr("---FP---|"); | |
789 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32; | |
790 for( int i2=0; i2<16; i2++ ) { | |
791 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
792 tty->print_cr(""); | |
793 } | |
794 #endif // SPARC | |
795 #endif // PRODUCT | |
796 | |
797 | |
798 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { | |
799 assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); | |
800 assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); | |
801 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization"); | |
802 | |
803 // Uncomment this to get some serious before/after printing of the | |
804 // Sparc safepoint-blob frame structure. | |
805 /* | |
806 intptr_t* sp = thread->last_Java_sp(); | |
807 intptr_t stack_copy[150]; | |
808 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i]; | |
809 bool was_oops[150]; | |
810 for( int i=0; i<150; i++ ) | |
811 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false; | |
812 */ | |
813 | |
814 if (ShowSafepointMsgs) { | |
815 tty->print("handle_polling_page_exception: "); | |
816 } | |
817 | |
818 if (PrintSafepointStatistics) { | |
819 inc_page_trap_count(); | |
820 } | |
821 | |
822 ThreadSafepointState* state = thread->safepoint_state(); | |
823 | |
824 state->handle_polling_page_exception(); | |
825 // print_me(sp,stack_copy,was_oops); | |
826 } | |
827 | |
828 | |
829 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) { | |
830 if (!timeout_error_printed) { | |
831 timeout_error_printed = true; | |
832 // Print out the thread infor which didn't reach the safepoint for debugging | |
833 // purposes (useful when there are lots of threads in the debugger). | |
834 tty->print_cr(""); | |
835 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:"); | |
836 if (reason == _spinning_timeout) { | |
837 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint."); | |
838 } else if (reason == _blocking_timeout) { | |
839 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop."); | |
840 } | |
841 | |
842 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:"); | |
843 ThreadSafepointState *cur_state; | |
844 ResourceMark rm; | |
845 for(JavaThread *cur_thread = Threads::first(); cur_thread; | |
846 cur_thread = cur_thread->next()) { | |
847 cur_state = cur_thread->safepoint_state(); | |
848 | |
849 if (cur_thread->thread_state() != _thread_blocked && | |
850 ((reason == _spinning_timeout && cur_state->is_running()) || | |
851 (reason == _blocking_timeout && !cur_state->has_called_back()))) { | |
852 tty->print("# "); | |
853 cur_thread->print(); | |
854 tty->print_cr(""); | |
855 } | |
856 } | |
857 tty->print_cr("# SafepointSynchronize::begin: (End of list)"); | |
858 } | |
859 | |
860 // To debug the long safepoint, specify both DieOnSafepointTimeout & | |
861 // ShowMessageBoxOnError. | |
862 if (DieOnSafepointTimeout) { | |
863 char msg[1024]; | |
864 VM_Operation *op = VMThread::vm_operation(); | |
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865 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.", |
0 | 866 SafepointTimeoutDelay, |
867 op != NULL ? op->name() : "no vm operation"); | |
868 fatal(msg); | |
869 } | |
870 } | |
871 | |
872 | |
873 // ------------------------------------------------------------------------------------------------------- | |
874 // Implementation of ThreadSafepointState | |
875 | |
876 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) { | |
877 _thread = thread; | |
878 _type = _running; | |
879 _has_called_back = false; | |
880 _at_poll_safepoint = false; | |
881 } | |
882 | |
883 void ThreadSafepointState::create(JavaThread *thread) { | |
884 ThreadSafepointState *state = new ThreadSafepointState(thread); | |
885 thread->set_safepoint_state(state); | |
886 } | |
887 | |
888 void ThreadSafepointState::destroy(JavaThread *thread) { | |
889 if (thread->safepoint_state()) { | |
890 delete(thread->safepoint_state()); | |
891 thread->set_safepoint_state(NULL); | |
892 } | |
893 } | |
894 | |
895 void ThreadSafepointState::examine_state_of_thread() { | |
896 assert(is_running(), "better be running or just have hit safepoint poll"); | |
897 | |
898 JavaThreadState state = _thread->thread_state(); | |
899 | |
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900 // Save the state at the start of safepoint processing. |
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901 _orig_thread_state = state; |
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902 |
0 | 903 // Check for a thread that is suspended. Note that thread resume tries |
904 // to grab the Threads_lock which we own here, so a thread cannot be | |
905 // resumed during safepoint synchronization. | |
906 | |
979 | 907 // We check to see if this thread is suspended without locking to |
908 // avoid deadlocking with a third thread that is waiting for this | |
909 // thread to be suspended. The third thread can notice the safepoint | |
910 // that we're trying to start at the beginning of its SR_lock->wait() | |
911 // call. If that happens, then the third thread will block on the | |
912 // safepoint while still holding the underlying SR_lock. We won't be | |
913 // able to get the SR_lock and we'll deadlock. | |
914 // | |
915 // We don't need to grab the SR_lock here for two reasons: | |
916 // 1) The suspend flags are both volatile and are set with an | |
917 // Atomic::cmpxchg() call so we should see the suspended | |
918 // state right away. | |
919 // 2) We're being called from the safepoint polling loop; if | |
920 // we don't see the suspended state on this iteration, then | |
921 // we'll come around again. | |
922 // | |
923 bool is_suspended = _thread->is_ext_suspended(); | |
0 | 924 if (is_suspended) { |
925 roll_forward(_at_safepoint); | |
926 return; | |
927 } | |
928 | |
929 // Some JavaThread states have an initial safepoint state of | |
930 // running, but are actually at a safepoint. We will happily | |
931 // agree and update the safepoint state here. | |
932 if (SafepointSynchronize::safepoint_safe(_thread, state)) { | |
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933 SafepointSynchronize::check_for_lazy_critical_native(_thread, state); |
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934 roll_forward(_at_safepoint); |
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935 return; |
0 | 936 } |
937 | |
938 if (state == _thread_in_vm) { | |
939 roll_forward(_call_back); | |
940 return; | |
941 } | |
942 | |
943 // All other thread states will continue to run until they | |
944 // transition and self-block in state _blocked | |
945 // Safepoint polling in compiled code causes the Java threads to do the same. | |
946 // Note: new threads may require a malloc so they must be allowed to finish | |
947 | |
948 assert(is_running(), "examine_state_of_thread on non-running thread"); | |
949 return; | |
950 } | |
951 | |
952 // Returns true is thread could not be rolled forward at present position. | |
953 void ThreadSafepointState::roll_forward(suspend_type type) { | |
954 _type = type; | |
955 | |
956 switch(_type) { | |
957 case _at_safepoint: | |
958 SafepointSynchronize::signal_thread_at_safepoint(); | |
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959 DEBUG_ONLY(_thread->set_visited_for_critical_count(true)); |
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960 if (_thread->in_critical()) { |
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961 // Notice that this thread is in a critical section |
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962 SafepointSynchronize::increment_jni_active_count(); |
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963 } |
0 | 964 break; |
965 | |
966 case _call_back: | |
967 set_has_called_back(false); | |
968 break; | |
969 | |
970 case _running: | |
971 default: | |
972 ShouldNotReachHere(); | |
973 } | |
974 } | |
975 | |
976 void ThreadSafepointState::restart() { | |
977 switch(type()) { | |
978 case _at_safepoint: | |
979 case _call_back: | |
980 break; | |
981 | |
982 case _running: | |
983 default: | |
984 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d", | |
985 _thread, _type); | |
986 _thread->print(); | |
987 ShouldNotReachHere(); | |
988 } | |
989 _type = _running; | |
990 set_has_called_back(false); | |
991 } | |
992 | |
993 | |
994 void ThreadSafepointState::print_on(outputStream *st) const { | |
995 const char *s; | |
996 | |
997 switch(_type) { | |
998 case _running : s = "_running"; break; | |
999 case _at_safepoint : s = "_at_safepoint"; break; | |
1000 case _call_back : s = "_call_back"; break; | |
1001 default: | |
1002 ShouldNotReachHere(); | |
1003 } | |
1004 | |
1005 st->print_cr("Thread: " INTPTR_FORMAT | |
1006 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d", | |
1007 _thread, _thread->osthread()->thread_id(), s, _has_called_back, | |
1008 _at_poll_safepoint); | |
1009 | |
1010 _thread->print_thread_state_on(st); | |
1011 } | |
1012 | |
1013 | |
1014 // --------------------------------------------------------------------------------------------------------------------- | |
1015 | |
1016 // Block the thread at the safepoint poll or poll return. | |
1017 void ThreadSafepointState::handle_polling_page_exception() { | |
1018 | |
1019 // Check state. block() will set thread state to thread_in_vm which will | |
1020 // cause the safepoint state _type to become _call_back. | |
1021 assert(type() == ThreadSafepointState::_running, | |
1022 "polling page exception on thread not running state"); | |
1023 | |
1024 // Step 1: Find the nmethod from the return address | |
1025 if (ShowSafepointMsgs && Verbose) { | |
1026 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc()); | |
1027 } | |
1028 address real_return_addr = thread()->saved_exception_pc(); | |
1029 | |
1030 CodeBlob *cb = CodeCache::find_blob(real_return_addr); | |
1031 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod"); | |
1032 nmethod* nm = (nmethod*)cb; | |
1033 | |
1034 // Find frame of caller | |
1035 frame stub_fr = thread()->last_frame(); | |
1036 CodeBlob* stub_cb = stub_fr.cb(); | |
1037 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub"); | |
1038 RegisterMap map(thread(), true); | |
1039 frame caller_fr = stub_fr.sender(&map); | |
1040 | |
1041 // Should only be poll_return or poll | |
1042 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" ); | |
1043 | |
1044 // This is a poll immediately before a return. The exception handling code | |
1045 // has already had the effect of causing the return to occur, so the execution | |
1046 // will continue immediately after the call. In addition, the oopmap at the | |
1047 // return point does not mark the return value as an oop (if it is), so | |
1048 // it needs a handle here to be updated. | |
1049 if( nm->is_at_poll_return(real_return_addr) ) { | |
1050 // See if return type is an oop. | |
1051 bool return_oop = nm->method()->is_returning_oop(); | |
1052 Handle return_value; | |
1053 if (return_oop) { | |
1054 // The oop result has been saved on the stack together with all | |
1055 // the other registers. In order to preserve it over GCs we need | |
1056 // to keep it in a handle. | |
1057 oop result = caller_fr.saved_oop_result(&map); | |
1058 assert(result == NULL || result->is_oop(), "must be oop"); | |
1059 return_value = Handle(thread(), result); | |
1060 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); | |
1061 } | |
1062 | |
1063 // Block the thread | |
1064 SafepointSynchronize::block(thread()); | |
1065 | |
1066 // restore oop result, if any | |
1067 if (return_oop) { | |
1068 caller_fr.set_saved_oop_result(&map, return_value()); | |
1069 } | |
1070 } | |
1071 | |
1072 // This is a safepoint poll. Verify the return address and block. | |
1073 else { | |
1074 set_at_poll_safepoint(true); | |
1075 | |
1076 // verify the blob built the "return address" correctly | |
1077 assert(real_return_addr == caller_fr.pc(), "must match"); | |
1078 | |
1079 // Block the thread | |
1080 SafepointSynchronize::block(thread()); | |
1081 set_at_poll_safepoint(false); | |
1082 | |
1083 // If we have a pending async exception deoptimize the frame | |
1084 // as otherwise we may never deliver it. | |
1085 if (thread()->has_async_condition()) { | |
1086 ThreadInVMfromJavaNoAsyncException __tiv(thread()); | |
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1087 Deoptimization::deoptimize_frame(thread(), caller_fr.id()); |
0 | 1088 } |
1089 | |
1090 // If an exception has been installed we must check for a pending deoptimization | |
1091 // Deoptimize frame if exception has been thrown. | |
1092 | |
1093 if (thread()->has_pending_exception() ) { | |
1094 RegisterMap map(thread(), true); | |
1095 frame caller_fr = stub_fr.sender(&map); | |
1096 if (caller_fr.is_deoptimized_frame()) { | |
1097 // The exception patch will destroy registers that are still | |
1098 // live and will be needed during deoptimization. Defer the | |
1099 // Async exception should have defered the exception until the | |
1100 // next safepoint which will be detected when we get into | |
1101 // the interpreter so if we have an exception now things | |
1102 // are messed up. | |
1103 | |
1104 fatal("Exception installed and deoptimization is pending"); | |
1105 } | |
1106 } | |
1107 } | |
1108 } | |
1109 | |
1110 | |
1111 // | |
1112 // Statistics & Instrumentations | |
1113 // | |
1114 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL; | |
1291
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1115 jlong SafepointSynchronize::_safepoint_begin_time = 0; |
0 | 1116 int SafepointSynchronize::_cur_stat_index = 0; |
1117 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating]; | |
1118 julong SafepointSynchronize::_coalesced_vmop_count = 0; | |
1119 jlong SafepointSynchronize::_max_sync_time = 0; | |
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1120 jlong SafepointSynchronize::_max_vmop_time = 0; |
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1121 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f; |
0 | 1122 |
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1123 static jlong cleanup_end_time = 0; |
0 | 1124 static bool need_to_track_page_armed_status = false; |
1125 static bool init_done = false; | |
1126 | |
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1127 // Helper method to print the header. |
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1128 static void print_header() { |
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1129 tty->print(" vmop " |
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1130 "[threads: total initially_running wait_to_block] "); |
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1131 tty->print("[time: spin block sync cleanup vmop] "); |
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1132 |
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1133 // no page armed status printed out if it is always armed. |
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1134 if (need_to_track_page_armed_status) { |
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1135 tty->print("page_armed "); |
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1136 } |
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1137 |
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1138 tty->print_cr("page_trap_count"); |
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1139 } |
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1140 |
0 | 1141 void SafepointSynchronize::deferred_initialize_stat() { |
1142 if (init_done) return; | |
1143 | |
1144 if (PrintSafepointStatisticsCount <= 0) { | |
1145 fatal("Wrong PrintSafepointStatisticsCount"); | |
1146 } | |
1147 | |
1148 // If PrintSafepointStatisticsTimeout is specified, the statistics data will | |
1149 // be printed right away, in which case, _safepoint_stats will regress to | |
1150 // a single element array. Otherwise, it is a circular ring buffer with default | |
1151 // size of PrintSafepointStatisticsCount. | |
1152 int stats_array_size; | |
1153 if (PrintSafepointStatisticsTimeout > 0) { | |
1154 stats_array_size = 1; | |
1155 PrintSafepointStatistics = true; | |
1156 } else { | |
1157 stats_array_size = PrintSafepointStatisticsCount; | |
1158 } | |
1159 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size | |
1160 * sizeof(SafepointStats)); | |
1161 guarantee(_safepoint_stats != NULL, | |
1162 "not enough memory for safepoint instrumentation data"); | |
1163 | |
1164 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) { | |
1165 need_to_track_page_armed_status = true; | |
1166 } | |
1167 init_done = true; | |
1168 } | |
1169 | |
1170 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) { | |
1003 | 1171 assert(init_done, "safepoint statistics array hasn't been initialized"); |
0 | 1172 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
1173 | |
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1174 spstat->_time_stamp = _ts_of_current_safepoint; |
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1175 |
0 | 1176 VM_Operation *op = VMThread::vm_operation(); |
1177 spstat->_vmop_type = (op != NULL ? op->type() : -1); | |
1178 if (op != NULL) { | |
1179 _safepoint_reasons[spstat->_vmop_type]++; | |
1180 } | |
1181 | |
1182 spstat->_nof_total_threads = nof_threads; | |
1183 spstat->_nof_initial_running_threads = nof_running; | |
1184 spstat->_nof_threads_hit_page_trap = 0; | |
1185 | |
1186 // Records the start time of spinning. The real time spent on spinning | |
1187 // will be adjusted when spin is done. Same trick is applied for time | |
1188 // spent on waiting for threads to block. | |
1189 if (nof_running != 0) { | |
1190 spstat->_time_to_spin = os::javaTimeNanos(); | |
1191 } else { | |
1192 spstat->_time_to_spin = 0; | |
1193 } | |
1194 } | |
1195 | |
1196 void SafepointSynchronize::update_statistics_on_spin_end() { | |
1197 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1198 | |
1199 jlong cur_time = os::javaTimeNanos(); | |
1200 | |
1201 spstat->_nof_threads_wait_to_block = _waiting_to_block; | |
1202 if (spstat->_nof_initial_running_threads != 0) { | |
1203 spstat->_time_to_spin = cur_time - spstat->_time_to_spin; | |
1204 } | |
1205 | |
1206 if (need_to_track_page_armed_status) { | |
1207 spstat->_page_armed = (PageArmed == 1); | |
1208 } | |
1209 | |
1210 // Records the start time of waiting for to block. Updated when block is done. | |
1211 if (_waiting_to_block != 0) { | |
1212 spstat->_time_to_wait_to_block = cur_time; | |
1213 } else { | |
1214 spstat->_time_to_wait_to_block = 0; | |
1215 } | |
1216 } | |
1217 | |
1218 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) { | |
1219 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1220 | |
1221 if (spstat->_nof_threads_wait_to_block != 0) { | |
1222 spstat->_time_to_wait_to_block = end_time - | |
1223 spstat->_time_to_wait_to_block; | |
1224 } | |
1225 | |
1226 // Records the end time of sync which will be used to calculate the total | |
1227 // vm operation time. Again, the real time spending in syncing will be deducted | |
1228 // from the start of the sync time later when end_statistics is called. | |
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1229 spstat->_time_to_sync = end_time - _safepoint_begin_time; |
0 | 1230 if (spstat->_time_to_sync > _max_sync_time) { |
1231 _max_sync_time = spstat->_time_to_sync; | |
1232 } | |
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1233 |
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1234 spstat->_time_to_do_cleanups = end_time; |
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1235 } |
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1236 |
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1237 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) { |
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1238 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
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1239 |
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1240 // Record how long spent in cleanup tasks. |
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1241 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups; |
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1242 |
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1243 cleanup_end_time = end_time; |
0 | 1244 } |
1245 | |
1246 void SafepointSynchronize::end_statistics(jlong vmop_end_time) { | |
1247 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1248 | |
1249 // Update the vm operation time. | |
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1250 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time; |
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1251 if (spstat->_time_to_exec_vmop > _max_vmop_time) { |
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1252 _max_vmop_time = spstat->_time_to_exec_vmop; |
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1253 } |
0 | 1254 // Only the sync time longer than the specified |
1255 // PrintSafepointStatisticsTimeout will be printed out right away. | |
1256 // By default, it is -1 meaning all samples will be put into the list. | |
1257 if ( PrintSafepointStatisticsTimeout > 0) { | |
1258 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1259 print_statistics(); | |
1260 } | |
1261 } else { | |
1262 // The safepoint statistics will be printed out when the _safepoin_stats | |
1263 // array fills up. | |
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1264 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) { |
0 | 1265 print_statistics(); |
1266 _cur_stat_index = 0; | |
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1267 } else { |
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1268 _cur_stat_index++; |
0 | 1269 } |
1270 } | |
1271 } | |
1272 | |
1273 void SafepointSynchronize::print_statistics() { | |
1274 SafepointStats* sstats = _safepoint_stats; | |
1275 | |
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1276 for (int index = 0; index <= _cur_stat_index; index++) { |
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1277 if (index % 30 == 0) { |
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1278 print_header(); |
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1279 } |
0 | 1280 sstats = &_safepoint_stats[index]; |
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1281 tty->print("%.3f: ", sstats->_time_stamp); |
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1282 tty->print("%-26s [" |
0 | 1283 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15) |
1291
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1284 " ] ", |
0 | 1285 sstats->_vmop_type == -1 ? "no vm operation" : |
1286 VM_Operation::name(sstats->_vmop_type), | |
1287 sstats->_nof_total_threads, | |
1288 sstats->_nof_initial_running_threads, | |
1289 sstats->_nof_threads_wait_to_block); | |
1290 // "/ MICROUNITS " is to convert the unit from nanos to millis. | |
1291
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1291 tty->print(" [" |
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1292 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1293 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1294 INT64_FORMAT_W(6)" ] ", |
0 | 1295 sstats->_time_to_spin / MICROUNITS, |
1296 sstats->_time_to_wait_to_block / MICROUNITS, | |
1297 sstats->_time_to_sync / MICROUNITS, | |
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1298 sstats->_time_to_do_cleanups / MICROUNITS, |
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1299 sstats->_time_to_exec_vmop / MICROUNITS); |
0 | 1300 |
1301 if (need_to_track_page_armed_status) { | |
1302 tty->print(INT32_FORMAT" ", sstats->_page_armed); | |
1303 } | |
1304 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap); | |
1305 } | |
1306 } | |
1307 | |
1308 // This method will be called when VM exits. It will first call | |
1309 // print_statistics to print out the rest of the sampling. Then | |
1310 // it tries to summarize the sampling. | |
1311 void SafepointSynchronize::print_stat_on_exit() { | |
1312 if (_safepoint_stats == NULL) return; | |
1313 | |
1314 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1315 | |
1316 // During VM exit, end_statistics may not get called and in that | |
1317 // case, if the sync time is less than PrintSafepointStatisticsTimeout, | |
1318 // don't print it out. | |
1319 // Approximate the vm op time. | |
1320 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop = | |
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1321 os::javaTimeNanos() - cleanup_end_time; |
0 | 1322 |
1323 if ( PrintSafepointStatisticsTimeout < 0 || | |
1324 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1325 print_statistics(); | |
1326 } | |
1327 tty->print_cr(""); | |
1328 | |
1329 // Print out polling page sampling status. | |
1330 if (!need_to_track_page_armed_status) { | |
1331 if (UseCompilerSafepoints) { | |
1332 tty->print_cr("Polling page always armed"); | |
1333 } | |
1334 } else { | |
1335 tty->print_cr("Defer polling page loop count = %d\n", | |
1336 DeferPollingPageLoopCount); | |
1337 } | |
1338 | |
1339 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) { | |
1340 if (_safepoint_reasons[index] != 0) { | |
1341 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index), | |
1342 _safepoint_reasons[index]); | |
1343 } | |
1344 } | |
1345 | |
1346 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint", | |
1347 _coalesced_vmop_count); | |
1348 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms", | |
1349 _max_sync_time / MICROUNITS); | |
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1350 tty->print_cr("Maximum vm operation time (except for Exit VM operation) " |
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1351 INT64_FORMAT_W(5)" ms", |
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1352 _max_vmop_time / MICROUNITS); |
0 | 1353 } |
1354 | |
1355 // ------------------------------------------------------------------------------------------------ | |
1356 // Non-product code | |
1357 | |
1358 #ifndef PRODUCT | |
1359 | |
1360 void SafepointSynchronize::print_state() { | |
1361 if (_state == _not_synchronized) { | |
1362 tty->print_cr("not synchronized"); | |
1363 } else if (_state == _synchronizing || _state == _synchronized) { | |
1364 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" : | |
1365 "synchronized"); | |
1366 | |
1367 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
1368 cur->safepoint_state()->print(); | |
1369 } | |
1370 } | |
1371 } | |
1372 | |
1373 void SafepointSynchronize::safepoint_msg(const char* format, ...) { | |
1374 if (ShowSafepointMsgs) { | |
1375 va_list ap; | |
1376 va_start(ap, format); | |
1377 tty->vprint_cr(format, ap); | |
1378 va_end(ap); | |
1379 } | |
1380 } | |
1381 | |
1382 #endif // !PRODUCT |