Mercurial > hg > truffle
annotate src/share/vm/runtime/safepoint.cpp @ 16704:3cd605c98060
NFI: cleanup
author | Matthias Grimmer <grimmer@ssw.jku.at> |
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date | Wed, 06 Aug 2014 08:27:42 +0200 |
parents | 66e3af78ea96 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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" | |
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42 #include "runtime/gpu.hpp" |
1972 | 43 #include "runtime/interfaceSupport.hpp" |
44 #include "runtime/mutexLocker.hpp" | |
45 #include "runtime/osThread.hpp" | |
46 #include "runtime/safepoint.hpp" | |
47 #include "runtime/signature.hpp" | |
48 #include "runtime/stubCodeGenerator.hpp" | |
49 #include "runtime/stubRoutines.hpp" | |
50 #include "runtime/sweeper.hpp" | |
51 #include "runtime/synchronizer.hpp" | |
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52 #include "runtime/thread.inline.hpp" |
6197 | 53 #include "services/memTracker.hpp" |
1972 | 54 #include "services/runtimeService.hpp" |
55 #include "utilities/events.hpp" | |
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56 #include "utilities/macros.hpp" |
1972 | 57 #ifdef TARGET_ARCH_x86 |
58 # include "nativeInst_x86.hpp" | |
59 # include "vmreg_x86.inline.hpp" | |
60 #endif | |
61 #ifdef TARGET_ARCH_sparc | |
62 # include "nativeInst_sparc.hpp" | |
63 # include "vmreg_sparc.inline.hpp" | |
64 #endif | |
65 #ifdef TARGET_ARCH_zero | |
66 # include "nativeInst_zero.hpp" | |
67 # include "vmreg_zero.inline.hpp" | |
68 #endif | |
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69 #ifdef TARGET_ARCH_arm |
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70 # include "nativeInst_arm.hpp" |
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71 # include "vmreg_arm.inline.hpp" |
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72 #endif |
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73 #ifdef TARGET_ARCH_ppc |
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74 # include "nativeInst_ppc.hpp" |
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75 # include "vmreg_ppc.inline.hpp" |
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76 #endif |
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77 #if INCLUDE_ALL_GCS |
1972 | 78 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
79 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
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80 #endif // INCLUDE_ALL_GCS |
1972 | 81 #ifdef COMPILER1 |
82 #include "c1/c1_globals.hpp" | |
83 #endif | |
0 | 84 |
85 // -------------------------------------------------------------------------------------------------- | |
86 // Implementation of Safepoint begin/end | |
87 | |
88 SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized; | |
89 volatile int SafepointSynchronize::_waiting_to_block = 0; | |
90 volatile int SafepointSynchronize::_safepoint_counter = 0; | |
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91 int SafepointSynchronize::_current_jni_active_count = 0; |
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92 long SafepointSynchronize::_end_of_last_safepoint = 0; |
0 | 93 static volatile int PageArmed = 0 ; // safepoint polling page is RO|RW vs PROT_NONE |
94 static volatile int TryingToBlock = 0 ; // proximate value -- for advisory use only | |
95 static bool timeout_error_printed = false; | |
96 | |
97 // Roll all threads forward to a safepoint and suspend them all | |
98 void SafepointSynchronize::begin() { | |
99 | |
100 Thread* myThread = Thread::current(); | |
101 assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint"); | |
102 | |
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103 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { |
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104 _safepoint_begin_time = os::javaTimeNanos(); |
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105 _ts_of_current_safepoint = tty->time_stamp().seconds(); |
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106 } |
0 | 107 |
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108 #if INCLUDE_ALL_GCS |
0 | 109 if (UseConcMarkSweepGC) { |
110 // In the future we should investigate whether CMS can use the | |
111 // more-general mechanism below. DLD (01/05). | |
112 ConcurrentMarkSweepThread::synchronize(false); | |
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113 } else if (UseG1GC) { |
0 | 114 ConcurrentGCThread::safepoint_synchronize(); |
115 } | |
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116 #endif // INCLUDE_ALL_GCS |
0 | 117 |
118 // By getting the Threads_lock, we assure that no threads are about to start or | |
119 // exit. It is released again in SafepointSynchronize::end(). | |
120 Threads_lock->lock(); | |
121 | |
122 assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state"); | |
123 | |
124 int nof_threads = Threads::number_of_threads(); | |
125 | |
126 if (TraceSafepoint) { | |
127 tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads); | |
128 } | |
129 | |
130 RuntimeService::record_safepoint_begin(); | |
131 | |
132 MutexLocker mu(Safepoint_lock); | |
133 | |
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134 // Reset the count of active JNI critical threads |
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135 _current_jni_active_count = 0; |
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136 |
0 | 137 // Set number of threads to wait for, before we initiate the callbacks |
138 _waiting_to_block = nof_threads; | |
139 TryingToBlock = 0 ; | |
140 int still_running = nof_threads; | |
141 | |
142 // Save the starting time, so that it can be compared to see if this has taken | |
143 // too long to complete. | |
144 jlong safepoint_limit_time; | |
145 timeout_error_printed = false; | |
146 | |
1003 | 147 // PrintSafepointStatisticsTimeout can be specified separately. When |
148 // specified, PrintSafepointStatistics will be set to true in | |
149 // deferred_initialize_stat method. The initialization has to be done | |
150 // early enough to avoid any races. See bug 6880029 for details. | |
151 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { | |
152 deferred_initialize_stat(); | |
153 } | |
154 | |
0 | 155 // Begin the process of bringing the system to a safepoint. |
156 // Java threads can be in several different states and are | |
157 // stopped by different mechanisms: | |
158 // | |
159 // 1. Running interpreted | |
14909 | 160 // The interpeter dispatch table is changed to force it to |
0 | 161 // check for a safepoint condition between bytecodes. |
162 // 2. Running in native code | |
163 // When returning from the native code, a Java thread must check | |
164 // the safepoint _state to see if we must block. If the | |
165 // VM thread sees a Java thread in native, it does | |
166 // not wait for this thread to block. The order of the memory | |
167 // writes and reads of both the safepoint state and the Java | |
168 // threads state is critical. In order to guarantee that the | |
169 // memory writes are serialized with respect to each other, | |
170 // the VM thread issues a memory barrier instruction | |
171 // (on MP systems). In order to avoid the overhead of issuing | |
172 // a memory barrier for each Java thread making native calls, each Java | |
173 // thread performs a write to a single memory page after changing | |
174 // the thread state. The VM thread performs a sequence of | |
175 // mprotect OS calls which forces all previous writes from all | |
176 // Java threads to be serialized. This is done in the | |
177 // os::serialize_thread_states() call. This has proven to be | |
178 // much more efficient than executing a membar instruction | |
179 // on every call to native code. | |
180 // 3. Running compiled Code | |
181 // Compiled code reads a global (Safepoint Polling) page that | |
182 // is set to fault if we are trying to get to a safepoint. | |
183 // 4. Blocked | |
184 // A thread which is blocked will not be allowed to return from the | |
185 // block condition until the safepoint operation is complete. | |
186 // 5. In VM or Transitioning between states | |
187 // If a Java thread is currently running in the VM or transitioning | |
188 // between states, the safepointing code will wait for the thread to | |
189 // block itself when it attempts transitions to a new state. | |
190 // | |
191 _state = _synchronizing; | |
192 OrderAccess::fence(); | |
193 | |
194 // Flush all thread states to memory | |
195 if (!UseMembar) { | |
196 os::serialize_thread_states(); | |
197 } | |
198 | |
199 // Make interpreter safepoint aware | |
200 Interpreter::notice_safepoints(); | |
201 | |
202 if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) { | |
203 // Make polling safepoint aware | |
204 guarantee (PageArmed == 0, "invariant") ; | |
205 PageArmed = 1 ; | |
206 os::make_polling_page_unreadable(); | |
207 } | |
208 | |
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209 #ifdef GRAAL |
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210 if (UseHSAILSafepoints) { |
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211 Gpu::safepoint_event(Gpu::SafepointBegin); |
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212 } |
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213 #endif |
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214 |
0 | 215 // Consider using active_processor_count() ... but that call is expensive. |
216 int ncpus = os::processor_count() ; | |
217 | |
218 #ifdef ASSERT | |
219 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
220 assert(cur->safepoint_state()->is_running(), "Illegal initial state"); | |
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221 // Clear the visited flag to ensure that the critical counts are collected properly. |
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222 cur->set_visited_for_critical_count(false); |
0 | 223 } |
224 #endif // ASSERT | |
225 | |
226 if (SafepointTimeout) | |
227 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS; | |
228 | |
229 // Iterate through all threads until it have been determined how to stop them all at a safepoint | |
230 unsigned int iterations = 0; | |
231 int steps = 0 ; | |
232 while(still_running > 0) { | |
233 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
234 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended"); | |
235 ThreadSafepointState *cur_state = cur->safepoint_state(); | |
236 if (cur_state->is_running()) { | |
237 cur_state->examine_state_of_thread(); | |
238 if (!cur_state->is_running()) { | |
239 still_running--; | |
240 // consider adjusting steps downward: | |
241 // steps = 0 | |
242 // steps -= NNN | |
243 // steps >>= 1 | |
244 // steps = MIN(steps, 2000-100) | |
245 // if (iterations != 0) steps -= NNN | |
246 } | |
247 if (TraceSafepoint && Verbose) cur_state->print(); | |
248 } | |
249 } | |
250 | |
1003 | 251 if (PrintSafepointStatistics && iterations == 0) { |
0 | 252 begin_statistics(nof_threads, still_running); |
253 } | |
254 | |
255 if (still_running > 0) { | |
256 // Check for if it takes to long | |
257 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) { | |
258 print_safepoint_timeout(_spinning_timeout); | |
259 } | |
260 | |
261 // Spin to avoid context switching. | |
262 // There's a tension between allowing the mutators to run (and rendezvous) | |
263 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that | |
264 // a mutator might otherwise use profitably to reach a safepoint. Excessive | |
265 // spinning by the VM thread on a saturated system can increase rendezvous latency. | |
266 // Blocking or yielding incur their own penalties in the form of context switching | |
267 // and the resultant loss of $ residency. | |
268 // | |
269 // Further complicating matters is that yield() does not work as naively expected | |
270 // on many platforms -- yield() does not guarantee that any other ready threads | |
271 // will run. As such we revert yield_all() after some number of iterations. | |
272 // Yield_all() is implemented as a short unconditional sleep on some platforms. | |
273 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping | |
274 // can actually increase the time it takes the VM thread to detect that a system-wide | |
275 // stop-the-world safepoint has been reached. In a pathological scenario such as that | |
276 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe. | |
277 // In that case the mutators will be stalled waiting for the safepoint to complete and the | |
278 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread | |
279 // will eventually wake up and detect that all mutators are safe, at which point | |
280 // we'll again make progress. | |
281 // | |
282 // Beware too that that the VMThread typically runs at elevated priority. | |
283 // Its default priority is higher than the default mutator priority. | |
284 // Obviously, this complicates spinning. | |
285 // | |
286 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0). | |
287 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will. | |
288 // | |
289 // See the comments in synchronizer.cpp for additional remarks on spinning. | |
290 // | |
291 // In the future we might: | |
14909 | 292 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning. |
0 | 293 // This is tricky as the path used by a thread exiting the JVM (say on |
294 // on JNI call-out) simply stores into its state field. The burden | |
295 // is placed on the VM thread, which must poll (spin). | |
296 // 2. Find something useful to do while spinning. If the safepoint is GC-related | |
297 // we might aggressively scan the stacks of threads that are already safe. | |
298 // 3. Use Solaris schedctl to examine the state of the still-running mutators. | |
299 // If all the mutators are ONPROC there's no reason to sleep or yield. | |
300 // 4. YieldTo() any still-running mutators that are ready but OFFPROC. | |
301 // 5. Check system saturation. If the system is not fully saturated then | |
302 // simply spin and avoid sleep/yield. | |
303 // 6. As still-running mutators rendezvous they could unpark the sleeping | |
304 // VMthread. This works well for still-running mutators that become | |
305 // safe. The VMthread must still poll for mutators that call-out. | |
306 // 7. Drive the policy on time-since-begin instead of iterations. | |
307 // 8. Consider making the spin duration a function of the # of CPUs: | |
308 // Spin = (((ncpus-1) * M) + K) + F(still_running) | |
309 // Alternately, instead of counting iterations of the outer loop | |
310 // we could count the # of threads visited in the inner loop, above. | |
311 // 9. On windows consider using the return value from SwitchThreadTo() | |
312 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions. | |
313 | |
314 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) { | |
315 guarantee (PageArmed == 0, "invariant") ; | |
316 PageArmed = 1 ; | |
317 os::make_polling_page_unreadable(); | |
318 } | |
319 | |
320 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or | |
321 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus) | |
322 ++steps ; | |
323 if (ncpus > 1 && steps < SafepointSpinBeforeYield) { | |
324 SpinPause() ; // MP-Polite spin | |
325 } else | |
326 if (steps < DeferThrSuspendLoopCount) { | |
327 os::NakedYield() ; | |
328 } else { | |
329 os::yield_all(steps) ; | |
330 // Alternately, the VM thread could transiently depress its scheduling priority or | |
331 // transiently increase the priority of the tardy mutator(s). | |
332 } | |
333 | |
334 iterations ++ ; | |
335 } | |
336 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long"); | |
337 } | |
338 assert(still_running == 0, "sanity check"); | |
339 | |
340 if (PrintSafepointStatistics) { | |
341 update_statistics_on_spin_end(); | |
342 } | |
343 | |
344 // wait until all threads are stopped | |
345 while (_waiting_to_block > 0) { | |
346 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block); | |
347 if (!SafepointTimeout || timeout_error_printed) { | |
348 Safepoint_lock->wait(true); // true, means with no safepoint checks | |
349 } else { | |
350 // Compute remaining time | |
351 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos(); | |
352 | |
353 // If there is no remaining time, then there is an error | |
354 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) { | |
355 print_safepoint_timeout(_blocking_timeout); | |
356 } | |
357 } | |
358 } | |
359 assert(_waiting_to_block == 0, "sanity check"); | |
360 | |
361 #ifndef PRODUCT | |
362 if (SafepointTimeout) { | |
363 jlong current_time = os::javaTimeNanos(); | |
364 if (safepoint_limit_time < current_time) { | |
365 tty->print_cr("# SafepointSynchronize: Finished after " | |
366 INT64_FORMAT_W(6) " ms", | |
367 ((current_time - safepoint_limit_time) / MICROUNITS + | |
368 SafepointTimeoutDelay)); | |
369 } | |
370 } | |
371 #endif | |
372 | |
373 assert((_safepoint_counter & 0x1) == 0, "must be even"); | |
374 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
375 _safepoint_counter ++; | |
376 | |
377 // Record state | |
378 _state = _synchronized; | |
379 | |
380 OrderAccess::fence(); | |
381 | |
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382 #ifdef ASSERT |
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383 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { |
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384 // make sure all the threads were visited |
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385 assert(cur->was_visited_for_critical_count(), "missed a thread"); |
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386 } |
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387 #endif // ASSERT |
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388 |
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389 // Update the count of active JNI critical regions |
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390 GC_locker::set_jni_lock_count(_current_jni_active_count); |
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391 |
0 | 392 if (TraceSafepoint) { |
393 VM_Operation *op = VMThread::vm_operation(); | |
394 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation"); | |
395 } | |
396 | |
397 RuntimeService::record_safepoint_synchronized(); | |
398 if (PrintSafepointStatistics) { | |
399 update_statistics_on_sync_end(os::javaTimeNanos()); | |
400 } | |
401 | |
402 // Call stuff that needs to be run when a safepoint is just about to be completed | |
403 do_cleanup_tasks(); | |
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404 |
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405 if (PrintSafepointStatistics) { |
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406 // Record how much time spend on the above cleanup tasks |
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407 update_statistics_on_cleanup_end(os::javaTimeNanos()); |
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408 } |
0 | 409 } |
410 | |
411 // Wake up all threads, so they are ready to resume execution after the safepoint | |
412 // operation has been carried out | |
413 void SafepointSynchronize::end() { | |
414 | |
415 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
416 assert((_safepoint_counter & 0x1) == 1, "must be odd"); | |
417 _safepoint_counter ++; | |
418 // memory fence isn't required here since an odd _safepoint_counter | |
419 // value can do no harm and a fence is issued below anyway. | |
420 | |
421 DEBUG_ONLY(Thread* myThread = Thread::current();) | |
422 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint"); | |
423 | |
424 if (PrintSafepointStatistics) { | |
425 end_statistics(os::javaTimeNanos()); | |
426 } | |
427 | |
428 #ifdef ASSERT | |
429 // A pending_exception cannot be installed during a safepoint. The threads | |
430 // may install an async exception after they come back from a safepoint into | |
431 // pending_exception after they unblock. But that should happen later. | |
432 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
433 assert (!(cur->has_pending_exception() && | |
434 cur->safepoint_state()->is_at_poll_safepoint()), | |
435 "safepoint installed a pending exception"); | |
436 } | |
437 #endif // ASSERT | |
438 | |
439 if (PageArmed) { | |
440 // Make polling safepoint aware | |
441 os::make_polling_page_readable(); | |
442 PageArmed = 0 ; | |
443 } | |
444 | |
445 // Remove safepoint check from interpreter | |
446 Interpreter::ignore_safepoints(); | |
447 | |
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448 #ifdef GRAAL |
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449 if (UseHSAILSafepoints) { |
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450 Gpu::safepoint_event(Gpu::SafepointEnd); |
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451 } |
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452 #endif |
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453 |
0 | 454 { |
455 MutexLocker mu(Safepoint_lock); | |
456 | |
457 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization"); | |
458 | |
459 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method | |
460 // when they get restarted. | |
461 _state = _not_synchronized; | |
462 OrderAccess::fence(); | |
463 | |
464 if (TraceSafepoint) { | |
465 tty->print_cr("Leaving safepoint region"); | |
466 } | |
467 | |
468 // Start suspended threads | |
469 for(JavaThread *current = Threads::first(); current; current = current->next()) { | |
605 | 470 // A problem occurring on Solaris is when attempting to restart threads |
0 | 471 // the first #cpus - 1 go well, but then the VMThread is preempted when we get |
472 // to the next one (since it has been running the longest). We then have | |
473 // to wait for a cpu to become available before we can continue restarting | |
474 // threads. | |
475 // FIXME: This causes the performance of the VM to degrade when active and with | |
476 // large numbers of threads. Apparently this is due to the synchronous nature | |
477 // of suspending threads. | |
478 // | |
479 // TODO-FIXME: the comments above are vestigial and no longer apply. | |
480 // Furthermore, using solaris' schedctl in this particular context confers no benefit | |
481 if (VMThreadHintNoPreempt) { | |
482 os::hint_no_preempt(); | |
483 } | |
484 ThreadSafepointState* cur_state = current->safepoint_state(); | |
485 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint"); | |
486 cur_state->restart(); | |
487 assert(cur_state->is_running(), "safepoint state has not been reset"); | |
488 } | |
489 | |
490 RuntimeService::record_safepoint_end(); | |
491 | |
492 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads | |
493 // blocked in signal_thread_blocked | |
494 Threads_lock->unlock(); | |
495 | |
496 } | |
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497 #if INCLUDE_ALL_GCS |
0 | 498 // If there are any concurrent GC threads resume them. |
499 if (UseConcMarkSweepGC) { | |
500 ConcurrentMarkSweepThread::desynchronize(false); | |
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501 } else if (UseG1GC) { |
0 | 502 ConcurrentGCThread::safepoint_desynchronize(); |
503 } | |
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504 #endif // INCLUDE_ALL_GCS |
14909 | 505 // record this time so VMThread can keep track how much time has elasped |
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506 // since last safepoint. |
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507 _end_of_last_safepoint = os::javaTimeMillis(); |
0 | 508 } |
509 | |
510 bool SafepointSynchronize::is_cleanup_needed() { | |
511 // Need a safepoint if some inline cache buffers is non-empty | |
512 if (!InlineCacheBuffer::is_empty()) return true; | |
513 return false; | |
514 } | |
515 | |
516 | |
517 | |
518 // Various cleaning tasks that should be done periodically at safepoints | |
519 void SafepointSynchronize::do_cleanup_tasks() { | |
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520 { |
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521 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); |
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522 ObjectSynchronizer::deflate_idle_monitors(); |
0 | 523 } |
524 | |
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525 { |
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526 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); |
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527 InlineCacheBuffer::update_inline_caches(); |
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528 } |
1783 | 529 { |
530 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime); | |
531 CompilationPolicy::policy()->do_safepoint_work(); | |
0 | 532 } |
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533 |
6162 | 534 { |
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535 TraceTime t4("mark nmethods", TraceSafepointCleanupTime); |
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536 NMethodSweeper::mark_active_nmethods(); |
6162 | 537 } |
538 | |
539 if (SymbolTable::needs_rehashing()) { | |
540 TraceTime t5("rehashing symbol table", TraceSafepointCleanupTime); | |
541 SymbolTable::rehash_table(); | |
542 } | |
543 | |
544 if (StringTable::needs_rehashing()) { | |
545 TraceTime t6("rehashing string table", TraceSafepointCleanupTime); | |
546 StringTable::rehash_table(); | |
547 } | |
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548 |
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549 // rotate log files? |
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550 if (UseGCLogFileRotation) { |
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551 gclog_or_tty->rotate_log(); |
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552 } |
6197 | 553 |
554 if (MemTracker::is_on()) { | |
555 MemTracker::sync(); | |
556 } | |
0 | 557 } |
558 | |
559 | |
560 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) { | |
561 switch(state) { | |
562 case _thread_in_native: | |
563 // native threads are safe if they have no java stack or have walkable stack | |
564 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable(); | |
565 | |
566 // blocked threads should have already have walkable stack | |
567 case _thread_blocked: | |
568 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable"); | |
569 return true; | |
570 | |
571 default: | |
572 return false; | |
573 } | |
574 } | |
575 | |
576 | |
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577 // See if the thread is running inside a lazy critical native and |
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578 // update the thread critical count if so. Also set a suspend flag to |
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579 // cause the native wrapper to return into the JVM to do the unlock |
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580 // once the native finishes. |
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581 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) { |
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582 if (state == _thread_in_native && |
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583 thread->has_last_Java_frame() && |
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584 thread->frame_anchor()->walkable()) { |
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585 // This thread might be in a critical native nmethod so look at |
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586 // the top of the stack and increment the critical count if it |
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587 // is. |
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588 frame wrapper_frame = thread->last_frame(); |
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589 CodeBlob* stub_cb = wrapper_frame.cb(); |
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590 if (stub_cb != NULL && |
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591 stub_cb->is_nmethod() && |
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592 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) { |
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593 // A thread could potentially be in a critical native across |
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594 // more than one safepoint, so only update the critical state on |
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595 // the first one. When it returns it will perform the unlock. |
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596 if (!thread->do_critical_native_unlock()) { |
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597 #ifdef ASSERT |
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598 if (!thread->in_critical()) { |
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599 GC_locker::increment_debug_jni_lock_count(); |
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600 } |
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601 #endif |
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602 thread->enter_critical(); |
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603 // Make sure the native wrapper calls back on return to |
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604 // perform the needed critical unlock. |
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605 thread->set_critical_native_unlock(); |
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606 } |
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607 } |
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608 } |
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609 } |
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610 |
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611 |
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612 |
0 | 613 // ------------------------------------------------------------------------------------------------------- |
614 // Implementation of Safepoint callback point | |
615 | |
616 void SafepointSynchronize::block(JavaThread *thread) { | |
617 assert(thread != NULL, "thread must be set"); | |
618 assert(thread->is_Java_thread(), "not a Java thread"); | |
619 | |
620 // Threads shouldn't block if they are in the middle of printing, but... | |
621 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id()); | |
622 | |
623 // Only bail from the block() call if the thread is gone from the | |
624 // thread list; starting to exit should still block. | |
625 if (thread->is_terminated()) { | |
626 // block current thread if we come here from native code when VM is gone | |
627 thread->block_if_vm_exited(); | |
628 | |
629 // otherwise do nothing | |
630 return; | |
631 } | |
632 | |
633 JavaThreadState state = thread->thread_state(); | |
634 thread->frame_anchor()->make_walkable(thread); | |
635 | |
636 // Check that we have a valid thread_state at this point | |
637 switch(state) { | |
638 case _thread_in_vm_trans: | |
639 case _thread_in_Java: // From compiled code | |
640 | |
641 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case, | |
642 // we pretend we are still in the VM. | |
643 thread->set_thread_state(_thread_in_vm); | |
644 | |
645 if (is_synchronizing()) { | |
646 Atomic::inc (&TryingToBlock) ; | |
647 } | |
648 | |
649 // We will always be holding the Safepoint_lock when we are examine the state | |
650 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and | |
651 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code | |
652 Safepoint_lock->lock_without_safepoint_check(); | |
653 if (is_synchronizing()) { | |
654 // Decrement the number of threads to wait for and signal vm thread | |
655 assert(_waiting_to_block > 0, "sanity check"); | |
656 _waiting_to_block--; | |
657 thread->safepoint_state()->set_has_called_back(true); | |
658 | |
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659 DEBUG_ONLY(thread->set_visited_for_critical_count(true)); |
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660 if (thread->in_critical()) { |
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661 // Notice that this thread is in a critical section |
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662 increment_jni_active_count(); |
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663 } |
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664 |
0 | 665 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread |
666 if (_waiting_to_block == 0) { | |
667 Safepoint_lock->notify_all(); | |
668 } | |
669 } | |
670 | |
671 // We transition the thread to state _thread_blocked here, but | |
672 // we can't do our usual check for external suspension and then | |
673 // self-suspend after the lock_without_safepoint_check() call | |
674 // below because we are often called during transitions while | |
675 // we hold different locks. That would leave us suspended while | |
676 // holding a resource which results in deadlocks. | |
677 thread->set_thread_state(_thread_blocked); | |
678 Safepoint_lock->unlock(); | |
679 | |
680 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during | |
681 // the entire safepoint, the threads will all line up here during the safepoint. | |
682 Threads_lock->lock_without_safepoint_check(); | |
683 // restore original state. This is important if the thread comes from compiled code, so it | |
684 // will continue to execute with the _thread_in_Java state. | |
685 thread->set_thread_state(state); | |
686 Threads_lock->unlock(); | |
687 break; | |
688 | |
689 case _thread_in_native_trans: | |
690 case _thread_blocked_trans: | |
691 case _thread_new_trans: | |
692 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) { | |
693 thread->print_thread_state(); | |
694 fatal("Deadlock in safepoint code. " | |
695 "Should have called back to the VM before blocking."); | |
696 } | |
697 | |
698 // We transition the thread to state _thread_blocked here, but | |
699 // we can't do our usual check for external suspension and then | |
700 // self-suspend after the lock_without_safepoint_check() call | |
701 // below because we are often called during transitions while | |
702 // we hold different locks. That would leave us suspended while | |
703 // holding a resource which results in deadlocks. | |
704 thread->set_thread_state(_thread_blocked); | |
705 | |
706 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence, | |
707 // the safepoint code might still be waiting for it to block. We need to change the state here, | |
708 // so it can see that it is at a safepoint. | |
709 | |
710 // Block until the safepoint operation is completed. | |
711 Threads_lock->lock_without_safepoint_check(); | |
712 | |
713 // Restore state | |
714 thread->set_thread_state(state); | |
715 | |
716 Threads_lock->unlock(); | |
717 break; | |
718 | |
719 default: | |
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720 fatal(err_msg("Illegal threadstate encountered: %d", state)); |
0 | 721 } |
722 | |
723 // Check for pending. async. exceptions or suspends - except if the | |
724 // thread was blocked inside the VM. has_special_runtime_exit_condition() | |
725 // is called last since it grabs a lock and we only want to do that when | |
726 // we must. | |
727 // | |
728 // Note: we never deliver an async exception at a polling point as the | |
729 // compiler may not have an exception handler for it. The polling | |
730 // code will notice the async and deoptimize and the exception will | |
731 // be delivered. (Polling at a return point is ok though). Sure is | |
732 // a lot of bother for a deprecated feature... | |
733 // | |
734 // We don't deliver an async exception if the thread state is | |
735 // _thread_in_native_trans so JNI functions won't be called with | |
736 // a surprising pending exception. If the thread state is going back to java, | |
737 // async exception is checked in check_special_condition_for_native_trans(). | |
738 | |
739 if (state != _thread_blocked_trans && | |
740 state != _thread_in_vm_trans && | |
741 thread->has_special_runtime_exit_condition()) { | |
742 thread->handle_special_runtime_exit_condition( | |
743 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans)); | |
744 } | |
745 } | |
746 | |
747 // ------------------------------------------------------------------------------------------------------ | |
748 // Exception handlers | |
749 | |
750 #ifndef PRODUCT | |
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751 |
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752 #ifdef SPARC |
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753 |
0 | 754 #ifdef _LP64 |
755 #define PTR_PAD "" | |
756 #else | |
757 #define PTR_PAD " " | |
758 #endif | |
759 | |
760 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) { | |
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761 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false; |
0 | 762 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s", |
763 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
764 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
765 } | |
766 | |
767 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) { | |
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768 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false; |
0 | 769 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s", |
770 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
771 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
772 } | |
773 | |
774 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) { | |
775 #ifdef _LP64 | |
776 tty->print_cr("--------+------address-----+------before-----------+-------after----------+"); | |
777 const int incr = 1; // Increment to skip a long, in units of intptr_t | |
778 #else | |
779 tty->print_cr("--------+--address-+------before-----------+-------after----------+"); | |
780 const int incr = 2; // Increment to skip a long, in units of intptr_t | |
781 #endif | |
782 tty->print_cr("---SP---|"); | |
783 for( int i=0; i<16; i++ ) { | |
784 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
785 tty->print_cr("--------|"); | |
786 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) { | |
787 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
788 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); | |
789 tty->print_cr("--------|"); | |
790 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; | |
791 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; | |
792 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; | |
793 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; | |
794 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp); | |
795 old_sp += incr; new_sp += incr; was_oops += incr; | |
796 // Skip the floats | |
797 tty->print_cr("--Float-|"PTR_FORMAT,new_sp); | |
798 tty->print_cr("---FP---|"); | |
799 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32; | |
800 for( int i2=0; i2<16; i2++ ) { | |
801 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
802 tty->print_cr(""); | |
803 } | |
804 #endif // SPARC | |
805 #endif // PRODUCT | |
806 | |
807 | |
808 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { | |
809 assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); | |
810 assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); | |
811 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization"); | |
812 | |
813 // Uncomment this to get some serious before/after printing of the | |
814 // Sparc safepoint-blob frame structure. | |
815 /* | |
816 intptr_t* sp = thread->last_Java_sp(); | |
817 intptr_t stack_copy[150]; | |
818 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i]; | |
819 bool was_oops[150]; | |
820 for( int i=0; i<150; i++ ) | |
821 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false; | |
822 */ | |
823 | |
824 if (ShowSafepointMsgs) { | |
825 tty->print("handle_polling_page_exception: "); | |
826 } | |
827 | |
828 if (PrintSafepointStatistics) { | |
829 inc_page_trap_count(); | |
830 } | |
831 | |
832 ThreadSafepointState* state = thread->safepoint_state(); | |
833 | |
834 state->handle_polling_page_exception(); | |
835 // print_me(sp,stack_copy,was_oops); | |
836 } | |
837 | |
838 | |
839 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) { | |
840 if (!timeout_error_printed) { | |
841 timeout_error_printed = true; | |
14909 | 842 // Print out the thread infor which didn't reach the safepoint for debugging |
0 | 843 // purposes (useful when there are lots of threads in the debugger). |
844 tty->print_cr(""); | |
845 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:"); | |
846 if (reason == _spinning_timeout) { | |
847 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint."); | |
848 } else if (reason == _blocking_timeout) { | |
849 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop."); | |
850 } | |
851 | |
852 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:"); | |
853 ThreadSafepointState *cur_state; | |
854 ResourceMark rm; | |
855 for(JavaThread *cur_thread = Threads::first(); cur_thread; | |
856 cur_thread = cur_thread->next()) { | |
857 cur_state = cur_thread->safepoint_state(); | |
858 | |
859 if (cur_thread->thread_state() != _thread_blocked && | |
860 ((reason == _spinning_timeout && cur_state->is_running()) || | |
861 (reason == _blocking_timeout && !cur_state->has_called_back()))) { | |
862 tty->print("# "); | |
863 cur_thread->print(); | |
864 tty->print_cr(""); | |
865 } | |
866 } | |
867 tty->print_cr("# SafepointSynchronize::begin: (End of list)"); | |
868 } | |
869 | |
870 // To debug the long safepoint, specify both DieOnSafepointTimeout & | |
871 // ShowMessageBoxOnError. | |
872 if (DieOnSafepointTimeout) { | |
873 char msg[1024]; | |
874 VM_Operation *op = VMThread::vm_operation(); | |
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875 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.", |
0 | 876 SafepointTimeoutDelay, |
877 op != NULL ? op->name() : "no vm operation"); | |
878 fatal(msg); | |
879 } | |
880 } | |
881 | |
882 | |
883 // ------------------------------------------------------------------------------------------------------- | |
884 // Implementation of ThreadSafepointState | |
885 | |
886 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) { | |
887 _thread = thread; | |
888 _type = _running; | |
889 _has_called_back = false; | |
890 _at_poll_safepoint = false; | |
891 } | |
892 | |
893 void ThreadSafepointState::create(JavaThread *thread) { | |
894 ThreadSafepointState *state = new ThreadSafepointState(thread); | |
895 thread->set_safepoint_state(state); | |
896 } | |
897 | |
898 void ThreadSafepointState::destroy(JavaThread *thread) { | |
899 if (thread->safepoint_state()) { | |
900 delete(thread->safepoint_state()); | |
901 thread->set_safepoint_state(NULL); | |
902 } | |
903 } | |
904 | |
905 void ThreadSafepointState::examine_state_of_thread() { | |
906 assert(is_running(), "better be running or just have hit safepoint poll"); | |
907 | |
908 JavaThreadState state = _thread->thread_state(); | |
909 | |
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910 // Save the state at the start of safepoint processing. |
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911 _orig_thread_state = state; |
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912 |
0 | 913 // Check for a thread that is suspended. Note that thread resume tries |
914 // to grab the Threads_lock which we own here, so a thread cannot be | |
915 // resumed during safepoint synchronization. | |
916 | |
979 | 917 // We check to see if this thread is suspended without locking to |
918 // avoid deadlocking with a third thread that is waiting for this | |
919 // thread to be suspended. The third thread can notice the safepoint | |
920 // that we're trying to start at the beginning of its SR_lock->wait() | |
921 // call. If that happens, then the third thread will block on the | |
922 // safepoint while still holding the underlying SR_lock. We won't be | |
923 // able to get the SR_lock and we'll deadlock. | |
924 // | |
925 // We don't need to grab the SR_lock here for two reasons: | |
926 // 1) The suspend flags are both volatile and are set with an | |
927 // Atomic::cmpxchg() call so we should see the suspended | |
928 // state right away. | |
929 // 2) We're being called from the safepoint polling loop; if | |
930 // we don't see the suspended state on this iteration, then | |
931 // we'll come around again. | |
932 // | |
933 bool is_suspended = _thread->is_ext_suspended(); | |
0 | 934 if (is_suspended) { |
935 roll_forward(_at_safepoint); | |
936 return; | |
937 } | |
938 | |
939 // Some JavaThread states have an initial safepoint state of | |
940 // running, but are actually at a safepoint. We will happily | |
941 // agree and update the safepoint state here. | |
942 if (SafepointSynchronize::safepoint_safe(_thread, state)) { | |
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943 SafepointSynchronize::check_for_lazy_critical_native(_thread, state); |
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944 roll_forward(_at_safepoint); |
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945 return; |
0 | 946 } |
947 | |
948 if (state == _thread_in_vm) { | |
949 roll_forward(_call_back); | |
950 return; | |
951 } | |
952 | |
953 // All other thread states will continue to run until they | |
954 // transition and self-block in state _blocked | |
955 // Safepoint polling in compiled code causes the Java threads to do the same. | |
956 // Note: new threads may require a malloc so they must be allowed to finish | |
957 | |
958 assert(is_running(), "examine_state_of_thread on non-running thread"); | |
959 return; | |
960 } | |
961 | |
962 // Returns true is thread could not be rolled forward at present position. | |
963 void ThreadSafepointState::roll_forward(suspend_type type) { | |
964 _type = type; | |
965 | |
966 switch(_type) { | |
967 case _at_safepoint: | |
968 SafepointSynchronize::signal_thread_at_safepoint(); | |
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969 DEBUG_ONLY(_thread->set_visited_for_critical_count(true)); |
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970 if (_thread->in_critical()) { |
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971 // Notice that this thread is in a critical section |
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972 SafepointSynchronize::increment_jni_active_count(); |
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973 } |
0 | 974 break; |
975 | |
976 case _call_back: | |
977 set_has_called_back(false); | |
978 break; | |
979 | |
980 case _running: | |
981 default: | |
982 ShouldNotReachHere(); | |
983 } | |
984 } | |
985 | |
986 void ThreadSafepointState::restart() { | |
987 switch(type()) { | |
988 case _at_safepoint: | |
989 case _call_back: | |
990 break; | |
991 | |
992 case _running: | |
993 default: | |
994 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d", | |
995 _thread, _type); | |
996 _thread->print(); | |
997 ShouldNotReachHere(); | |
998 } | |
999 _type = _running; | |
1000 set_has_called_back(false); | |
1001 } | |
1002 | |
1003 | |
1004 void ThreadSafepointState::print_on(outputStream *st) const { | |
1005 const char *s; | |
1006 | |
1007 switch(_type) { | |
1008 case _running : s = "_running"; break; | |
1009 case _at_safepoint : s = "_at_safepoint"; break; | |
1010 case _call_back : s = "_call_back"; break; | |
1011 default: | |
1012 ShouldNotReachHere(); | |
1013 } | |
1014 | |
1015 st->print_cr("Thread: " INTPTR_FORMAT | |
1016 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d", | |
1017 _thread, _thread->osthread()->thread_id(), s, _has_called_back, | |
1018 _at_poll_safepoint); | |
1019 | |
1020 _thread->print_thread_state_on(st); | |
1021 } | |
1022 | |
1023 | |
1024 // --------------------------------------------------------------------------------------------------------------------- | |
1025 | |
1026 // Block the thread at the safepoint poll or poll return. | |
1027 void ThreadSafepointState::handle_polling_page_exception() { | |
1028 | |
1029 // Check state. block() will set thread state to thread_in_vm which will | |
1030 // cause the safepoint state _type to become _call_back. | |
1031 assert(type() == ThreadSafepointState::_running, | |
1032 "polling page exception on thread not running state"); | |
1033 | |
1034 // Step 1: Find the nmethod from the return address | |
1035 if (ShowSafepointMsgs && Verbose) { | |
1036 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc()); | |
1037 } | |
1038 address real_return_addr = thread()->saved_exception_pc(); | |
1039 | |
1040 CodeBlob *cb = CodeCache::find_blob(real_return_addr); | |
1041 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod"); | |
1042 nmethod* nm = (nmethod*)cb; | |
1043 | |
1044 // Find frame of caller | |
1045 frame stub_fr = thread()->last_frame(); | |
1046 CodeBlob* stub_cb = stub_fr.cb(); | |
1047 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub"); | |
1048 RegisterMap map(thread(), true); | |
1049 frame caller_fr = stub_fr.sender(&map); | |
1050 | |
1051 // Should only be poll_return or poll | |
1052 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" ); | |
1053 | |
1054 // This is a poll immediately before a return. The exception handling code | |
1055 // has already had the effect of causing the return to occur, so the execution | |
1056 // will continue immediately after the call. In addition, the oopmap at the | |
1057 // return point does not mark the return value as an oop (if it is), so | |
1058 // it needs a handle here to be updated. | |
1059 if( nm->is_at_poll_return(real_return_addr) ) { | |
1060 // See if return type is an oop. | |
1061 bool return_oop = nm->method()->is_returning_oop(); | |
1062 Handle return_value; | |
1063 if (return_oop) { | |
1064 // The oop result has been saved on the stack together with all | |
1065 // the other registers. In order to preserve it over GCs we need | |
1066 // to keep it in a handle. | |
1067 oop result = caller_fr.saved_oop_result(&map); | |
1068 assert(result == NULL || result->is_oop(), "must be oop"); | |
1069 return_value = Handle(thread(), result); | |
1070 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); | |
1071 } | |
1072 | |
1073 // Block the thread | |
1074 SafepointSynchronize::block(thread()); | |
1075 | |
1076 // restore oop result, if any | |
1077 if (return_oop) { | |
1078 caller_fr.set_saved_oop_result(&map, return_value()); | |
1079 } | |
1080 } | |
1081 | |
1082 // This is a safepoint poll. Verify the return address and block. | |
1083 else { | |
1084 set_at_poll_safepoint(true); | |
1085 | |
1086 // verify the blob built the "return address" correctly | |
1087 assert(real_return_addr == caller_fr.pc(), "must match"); | |
1088 | |
1089 // Block the thread | |
1090 SafepointSynchronize::block(thread()); | |
1091 set_at_poll_safepoint(false); | |
1092 | |
1093 // If we have a pending async exception deoptimize the frame | |
1094 // as otherwise we may never deliver it. | |
1095 if (thread()->has_async_condition()) { | |
1096 ThreadInVMfromJavaNoAsyncException __tiv(thread()); | |
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1097 Deoptimization::deoptimize_frame(thread(), caller_fr.id()); |
0 | 1098 } |
1099 | |
1100 // If an exception has been installed we must check for a pending deoptimization | |
1101 // Deoptimize frame if exception has been thrown. | |
1102 | |
1103 if (thread()->has_pending_exception() ) { | |
1104 RegisterMap map(thread(), true); | |
1105 frame caller_fr = stub_fr.sender(&map); | |
1106 if (caller_fr.is_deoptimized_frame()) { | |
1107 // The exception patch will destroy registers that are still | |
1108 // live and will be needed during deoptimization. Defer the | |
14909 | 1109 // Async exception should have defered the exception until the |
0 | 1110 // next safepoint which will be detected when we get into |
1111 // the interpreter so if we have an exception now things | |
1112 // are messed up. | |
1113 | |
1114 fatal("Exception installed and deoptimization is pending"); | |
1115 } | |
1116 } | |
1117 } | |
1118 } | |
1119 | |
1120 | |
1121 // | |
1122 // Statistics & Instrumentations | |
1123 // | |
1124 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL; | |
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1125 jlong SafepointSynchronize::_safepoint_begin_time = 0; |
0 | 1126 int SafepointSynchronize::_cur_stat_index = 0; |
1127 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating]; | |
1128 julong SafepointSynchronize::_coalesced_vmop_count = 0; | |
1129 jlong SafepointSynchronize::_max_sync_time = 0; | |
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1130 jlong SafepointSynchronize::_max_vmop_time = 0; |
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1131 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f; |
0 | 1132 |
1291
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1133 static jlong cleanup_end_time = 0; |
0 | 1134 static bool need_to_track_page_armed_status = false; |
1135 static bool init_done = false; | |
1136 | |
1291
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1137 // Helper method to print the header. |
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1138 static void print_header() { |
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1139 tty->print(" vmop " |
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1140 "[threads: total initially_running wait_to_block] "); |
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1141 tty->print("[time: spin block sync cleanup vmop] "); |
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1142 |
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1143 // no page armed status printed out if it is always armed. |
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1144 if (need_to_track_page_armed_status) { |
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1145 tty->print("page_armed "); |
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1146 } |
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1147 |
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1148 tty->print_cr("page_trap_count"); |
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1149 } |
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1150 |
0 | 1151 void SafepointSynchronize::deferred_initialize_stat() { |
1152 if (init_done) return; | |
1153 | |
1154 if (PrintSafepointStatisticsCount <= 0) { | |
1155 fatal("Wrong PrintSafepointStatisticsCount"); | |
1156 } | |
1157 | |
1158 // If PrintSafepointStatisticsTimeout is specified, the statistics data will | |
1159 // be printed right away, in which case, _safepoint_stats will regress to | |
1160 // a single element array. Otherwise, it is a circular ring buffer with default | |
1161 // size of PrintSafepointStatisticsCount. | |
1162 int stats_array_size; | |
1163 if (PrintSafepointStatisticsTimeout > 0) { | |
1164 stats_array_size = 1; | |
1165 PrintSafepointStatistics = true; | |
1166 } else { | |
1167 stats_array_size = PrintSafepointStatisticsCount; | |
1168 } | |
1169 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size | |
6197 | 1170 * sizeof(SafepointStats), mtInternal); |
0 | 1171 guarantee(_safepoint_stats != NULL, |
1172 "not enough memory for safepoint instrumentation data"); | |
1173 | |
1174 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) { | |
1175 need_to_track_page_armed_status = true; | |
1176 } | |
1177 init_done = true; | |
1178 } | |
1179 | |
1180 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) { | |
1003 | 1181 assert(init_done, "safepoint statistics array hasn't been initialized"); |
0 | 1182 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
1183 | |
1291
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1184 spstat->_time_stamp = _ts_of_current_safepoint; |
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1185 |
0 | 1186 VM_Operation *op = VMThread::vm_operation(); |
1187 spstat->_vmop_type = (op != NULL ? op->type() : -1); | |
1188 if (op != NULL) { | |
1189 _safepoint_reasons[spstat->_vmop_type]++; | |
1190 } | |
1191 | |
1192 spstat->_nof_total_threads = nof_threads; | |
1193 spstat->_nof_initial_running_threads = nof_running; | |
1194 spstat->_nof_threads_hit_page_trap = 0; | |
1195 | |
1196 // Records the start time of spinning. The real time spent on spinning | |
1197 // will be adjusted when spin is done. Same trick is applied for time | |
1198 // spent on waiting for threads to block. | |
1199 if (nof_running != 0) { | |
1200 spstat->_time_to_spin = os::javaTimeNanos(); | |
1201 } else { | |
1202 spstat->_time_to_spin = 0; | |
1203 } | |
1204 } | |
1205 | |
1206 void SafepointSynchronize::update_statistics_on_spin_end() { | |
1207 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1208 | |
1209 jlong cur_time = os::javaTimeNanos(); | |
1210 | |
1211 spstat->_nof_threads_wait_to_block = _waiting_to_block; | |
1212 if (spstat->_nof_initial_running_threads != 0) { | |
1213 spstat->_time_to_spin = cur_time - spstat->_time_to_spin; | |
1214 } | |
1215 | |
1216 if (need_to_track_page_armed_status) { | |
1217 spstat->_page_armed = (PageArmed == 1); | |
1218 } | |
1219 | |
1220 // Records the start time of waiting for to block. Updated when block is done. | |
1221 if (_waiting_to_block != 0) { | |
1222 spstat->_time_to_wait_to_block = cur_time; | |
1223 } else { | |
1224 spstat->_time_to_wait_to_block = 0; | |
1225 } | |
1226 } | |
1227 | |
1228 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) { | |
1229 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1230 | |
1231 if (spstat->_nof_threads_wait_to_block != 0) { | |
1232 spstat->_time_to_wait_to_block = end_time - | |
1233 spstat->_time_to_wait_to_block; | |
1234 } | |
1235 | |
1236 // Records the end time of sync which will be used to calculate the total | |
1237 // vm operation time. Again, the real time spending in syncing will be deducted | |
1238 // from the start of the sync time later when end_statistics is called. | |
1291
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1239 spstat->_time_to_sync = end_time - _safepoint_begin_time; |
0 | 1240 if (spstat->_time_to_sync > _max_sync_time) { |
1241 _max_sync_time = spstat->_time_to_sync; | |
1242 } | |
1291
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1243 |
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1244 spstat->_time_to_do_cleanups = end_time; |
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1245 } |
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1246 |
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1247 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) { |
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1248 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
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1249 |
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1250 // Record how long spent in cleanup tasks. |
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1251 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups; |
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1252 |
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1253 cleanup_end_time = end_time; |
0 | 1254 } |
1255 | |
1256 void SafepointSynchronize::end_statistics(jlong vmop_end_time) { | |
1257 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1258 | |
1259 // Update the vm operation time. | |
1291
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1260 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time; |
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1261 if (spstat->_time_to_exec_vmop > _max_vmop_time) { |
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1262 _max_vmop_time = spstat->_time_to_exec_vmop; |
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1263 } |
0 | 1264 // Only the sync time longer than the specified |
1265 // PrintSafepointStatisticsTimeout will be printed out right away. | |
1266 // By default, it is -1 meaning all samples will be put into the list. | |
1267 if ( PrintSafepointStatisticsTimeout > 0) { | |
1268 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1269 print_statistics(); | |
1270 } | |
1271 } else { | |
1272 // The safepoint statistics will be printed out when the _safepoin_stats | |
1273 // array fills up. | |
1291
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1274 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) { |
0 | 1275 print_statistics(); |
1276 _cur_stat_index = 0; | |
1291
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1277 } else { |
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1278 _cur_stat_index++; |
0 | 1279 } |
1280 } | |
1281 } | |
1282 | |
1283 void SafepointSynchronize::print_statistics() { | |
1284 SafepointStats* sstats = _safepoint_stats; | |
1285 | |
1291
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1286 for (int index = 0; index <= _cur_stat_index; index++) { |
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1287 if (index % 30 == 0) { |
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1288 print_header(); |
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1289 } |
0 | 1290 sstats = &_safepoint_stats[index]; |
1291
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1291 tty->print("%.3f: ", sstats->_time_stamp); |
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1292 tty->print("%-26s [" |
0 | 1293 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15) |
1291
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1294 " ] ", |
0 | 1295 sstats->_vmop_type == -1 ? "no vm operation" : |
1296 VM_Operation::name(sstats->_vmop_type), | |
1297 sstats->_nof_total_threads, | |
1298 sstats->_nof_initial_running_threads, | |
1299 sstats->_nof_threads_wait_to_block); | |
1300 // "/ MICROUNITS " is to convert the unit from nanos to millis. | |
1291
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1301 tty->print(" [" |
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1302 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1303 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1304 INT64_FORMAT_W(6)" ] ", |
0 | 1305 sstats->_time_to_spin / MICROUNITS, |
1306 sstats->_time_to_wait_to_block / MICROUNITS, | |
1307 sstats->_time_to_sync / MICROUNITS, | |
1291
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1308 sstats->_time_to_do_cleanups / MICROUNITS, |
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1309 sstats->_time_to_exec_vmop / MICROUNITS); |
0 | 1310 |
1311 if (need_to_track_page_armed_status) { | |
1312 tty->print(INT32_FORMAT" ", sstats->_page_armed); | |
1313 } | |
1314 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap); | |
1315 } | |
1316 } | |
1317 | |
1318 // This method will be called when VM exits. It will first call | |
1319 // print_statistics to print out the rest of the sampling. Then | |
1320 // it tries to summarize the sampling. | |
1321 void SafepointSynchronize::print_stat_on_exit() { | |
1322 if (_safepoint_stats == NULL) return; | |
1323 | |
1324 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
1325 | |
1326 // During VM exit, end_statistics may not get called and in that | |
1327 // case, if the sync time is less than PrintSafepointStatisticsTimeout, | |
1328 // don't print it out. | |
1329 // Approximate the vm op time. | |
1330 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop = | |
1291
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1331 os::javaTimeNanos() - cleanup_end_time; |
0 | 1332 |
1333 if ( PrintSafepointStatisticsTimeout < 0 || | |
1334 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
1335 print_statistics(); | |
1336 } | |
1337 tty->print_cr(""); | |
1338 | |
1339 // Print out polling page sampling status. | |
1340 if (!need_to_track_page_armed_status) { | |
1341 if (UseCompilerSafepoints) { | |
1342 tty->print_cr("Polling page always armed"); | |
1343 } | |
1344 } else { | |
1345 tty->print_cr("Defer polling page loop count = %d\n", | |
1346 DeferPollingPageLoopCount); | |
1347 } | |
1348 | |
1349 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) { | |
1350 if (_safepoint_reasons[index] != 0) { | |
1351 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index), | |
1352 _safepoint_reasons[index]); | |
1353 } | |
1354 } | |
1355 | |
1356 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint", | |
1357 _coalesced_vmop_count); | |
1358 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms", | |
1359 _max_sync_time / MICROUNITS); | |
1291
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1360 tty->print_cr("Maximum vm operation time (except for Exit VM operation) " |
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1361 INT64_FORMAT_W(5)" ms", |
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1362 _max_vmop_time / MICROUNITS); |
0 | 1363 } |
1364 | |
1365 // ------------------------------------------------------------------------------------------------ | |
1366 // Non-product code | |
1367 | |
1368 #ifndef PRODUCT | |
1369 | |
1370 void SafepointSynchronize::print_state() { | |
1371 if (_state == _not_synchronized) { | |
1372 tty->print_cr("not synchronized"); | |
1373 } else if (_state == _synchronizing || _state == _synchronized) { | |
1374 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" : | |
1375 "synchronized"); | |
1376 | |
1377 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
1378 cur->safepoint_state()->print(); | |
1379 } | |
1380 } | |
1381 } | |
1382 | |
1383 void SafepointSynchronize::safepoint_msg(const char* format, ...) { | |
1384 if (ShowSafepointMsgs) { | |
1385 va_list ap; | |
1386 va_start(ap, format); | |
1387 tty->vprint_cr(format, ap); | |
1388 va_end(ap); | |
1389 } | |
1390 } | |
1391 | |
1392 #endif // !PRODUCT |