Mercurial > hg > truffle
annotate src/share/vm/runtime/safepoint.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
| author | goetz |
|---|---|
| date | Tue, 29 Apr 2014 15:17:27 +0200 |
| parents | 581e70386ec9 |
| children | 833b0f92429a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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" | |
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44 #include "runtime/orderAccess.inline.hpp" |
| 1972 | 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" |
| 20192 | 79 #include "gc_implementation/shared/suspendibleThreadSet.hpp" |
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80 #endif // INCLUDE_ALL_GCS |
| 1972 | 81 #ifdef COMPILER1 |
| 82 #include "c1/c1_globals.hpp" | |
| 83 #endif | |
| 0 | 84 |
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85 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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86 |
| 0 | 87 // -------------------------------------------------------------------------------------------------- |
| 88 // Implementation of Safepoint begin/end | |
| 89 | |
| 90 SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized; | |
| 91 volatile int SafepointSynchronize::_waiting_to_block = 0; | |
| 92 volatile int SafepointSynchronize::_safepoint_counter = 0; | |
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93 int SafepointSynchronize::_current_jni_active_count = 0; |
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94 long SafepointSynchronize::_end_of_last_safepoint = 0; |
| 0 | 95 static volatile int PageArmed = 0 ; // safepoint polling page is RO|RW vs PROT_NONE |
| 96 static volatile int TryingToBlock = 0 ; // proximate value -- for advisory use only | |
| 97 static bool timeout_error_printed = false; | |
| 98 | |
| 99 // Roll all threads forward to a safepoint and suspend them all | |
| 100 void SafepointSynchronize::begin() { | |
| 101 | |
| 102 Thread* myThread = Thread::current(); | |
| 103 assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint"); | |
| 104 | |
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105 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { |
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106 _safepoint_begin_time = os::javaTimeNanos(); |
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107 _ts_of_current_safepoint = tty->time_stamp().seconds(); |
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108 } |
| 0 | 109 |
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110 #if INCLUDE_ALL_GCS |
| 0 | 111 if (UseConcMarkSweepGC) { |
| 112 // In the future we should investigate whether CMS can use the | |
| 113 // more-general mechanism below. DLD (01/05). | |
| 114 ConcurrentMarkSweepThread::synchronize(false); | |
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115 } else if (UseG1GC) { |
| 20192 | 116 SuspendibleThreadSet::synchronize(); |
| 0 | 117 } |
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118 #endif // INCLUDE_ALL_GCS |
| 0 | 119 |
| 120 // By getting the Threads_lock, we assure that no threads are about to start or | |
| 121 // exit. It is released again in SafepointSynchronize::end(). | |
| 122 Threads_lock->lock(); | |
| 123 | |
| 124 assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state"); | |
| 125 | |
| 126 int nof_threads = Threads::number_of_threads(); | |
| 127 | |
| 128 if (TraceSafepoint) { | |
| 129 tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads); | |
| 130 } | |
| 131 | |
| 132 RuntimeService::record_safepoint_begin(); | |
| 133 | |
| 134 MutexLocker mu(Safepoint_lock); | |
| 135 | |
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136 // Reset the count of active JNI critical threads |
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137 _current_jni_active_count = 0; |
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138 |
| 0 | 139 // Set number of threads to wait for, before we initiate the callbacks |
| 140 _waiting_to_block = nof_threads; | |
| 141 TryingToBlock = 0 ; | |
| 142 int still_running = nof_threads; | |
| 143 | |
| 144 // Save the starting time, so that it can be compared to see if this has taken | |
| 145 // too long to complete. | |
| 146 jlong safepoint_limit_time; | |
| 147 timeout_error_printed = false; | |
| 148 | |
| 1003 | 149 // PrintSafepointStatisticsTimeout can be specified separately. When |
| 150 // specified, PrintSafepointStatistics will be set to true in | |
| 151 // deferred_initialize_stat method. The initialization has to be done | |
| 152 // early enough to avoid any races. See bug 6880029 for details. | |
| 153 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) { | |
| 154 deferred_initialize_stat(); | |
| 155 } | |
| 156 | |
| 0 | 157 // Begin the process of bringing the system to a safepoint. |
| 158 // Java threads can be in several different states and are | |
| 159 // stopped by different mechanisms: | |
| 160 // | |
| 161 // 1. Running interpreted | |
| 162 // The interpeter dispatch table is changed to force it to | |
| 163 // check for a safepoint condition between bytecodes. | |
| 164 // 2. Running in native code | |
| 165 // When returning from the native code, a Java thread must check | |
| 166 // the safepoint _state to see if we must block. If the | |
| 167 // VM thread sees a Java thread in native, it does | |
| 168 // not wait for this thread to block. The order of the memory | |
| 169 // writes and reads of both the safepoint state and the Java | |
| 170 // threads state is critical. In order to guarantee that the | |
| 171 // memory writes are serialized with respect to each other, | |
| 172 // the VM thread issues a memory barrier instruction | |
| 173 // (on MP systems). In order to avoid the overhead of issuing | |
| 174 // a memory barrier for each Java thread making native calls, each Java | |
| 175 // thread performs a write to a single memory page after changing | |
| 176 // the thread state. The VM thread performs a sequence of | |
| 177 // mprotect OS calls which forces all previous writes from all | |
| 178 // Java threads to be serialized. This is done in the | |
| 179 // os::serialize_thread_states() call. This has proven to be | |
| 180 // much more efficient than executing a membar instruction | |
| 181 // on every call to native code. | |
| 182 // 3. Running compiled Code | |
| 183 // Compiled code reads a global (Safepoint Polling) page that | |
| 184 // is set to fault if we are trying to get to a safepoint. | |
| 185 // 4. Blocked | |
| 186 // A thread which is blocked will not be allowed to return from the | |
| 187 // block condition until the safepoint operation is complete. | |
| 188 // 5. In VM or Transitioning between states | |
| 189 // If a Java thread is currently running in the VM or transitioning | |
| 190 // between states, the safepointing code will wait for the thread to | |
| 191 // block itself when it attempts transitions to a new state. | |
| 192 // | |
| 193 _state = _synchronizing; | |
| 194 OrderAccess::fence(); | |
| 195 | |
| 196 // Flush all thread states to memory | |
| 197 if (!UseMembar) { | |
| 198 os::serialize_thread_states(); | |
| 199 } | |
| 200 | |
| 201 // Make interpreter safepoint aware | |
| 202 Interpreter::notice_safepoints(); | |
| 203 | |
| 204 if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) { | |
| 205 // Make polling safepoint aware | |
| 206 guarantee (PageArmed == 0, "invariant") ; | |
| 207 PageArmed = 1 ; | |
| 208 os::make_polling_page_unreadable(); | |
| 209 } | |
| 210 | |
| 211 // Consider using active_processor_count() ... but that call is expensive. | |
| 212 int ncpus = os::processor_count() ; | |
| 213 | |
| 214 #ifdef ASSERT | |
| 215 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
| 216 assert(cur->safepoint_state()->is_running(), "Illegal initial state"); | |
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217 // Clear the visited flag to ensure that the critical counts are collected properly. |
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218 cur->set_visited_for_critical_count(false); |
| 0 | 219 } |
| 220 #endif // ASSERT | |
| 221 | |
| 222 if (SafepointTimeout) | |
| 223 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS; | |
| 224 | |
| 225 // Iterate through all threads until it have been determined how to stop them all at a safepoint | |
| 226 unsigned int iterations = 0; | |
| 227 int steps = 0 ; | |
| 228 while(still_running > 0) { | |
| 229 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { | |
| 230 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended"); | |
| 231 ThreadSafepointState *cur_state = cur->safepoint_state(); | |
| 232 if (cur_state->is_running()) { | |
| 233 cur_state->examine_state_of_thread(); | |
| 234 if (!cur_state->is_running()) { | |
| 235 still_running--; | |
| 236 // consider adjusting steps downward: | |
| 237 // steps = 0 | |
| 238 // steps -= NNN | |
| 239 // steps >>= 1 | |
| 240 // steps = MIN(steps, 2000-100) | |
| 241 // if (iterations != 0) steps -= NNN | |
| 242 } | |
| 243 if (TraceSafepoint && Verbose) cur_state->print(); | |
| 244 } | |
| 245 } | |
| 246 | |
| 1003 | 247 if (PrintSafepointStatistics && iterations == 0) { |
| 0 | 248 begin_statistics(nof_threads, still_running); |
| 249 } | |
| 250 | |
| 251 if (still_running > 0) { | |
| 252 // Check for if it takes to long | |
| 253 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) { | |
| 254 print_safepoint_timeout(_spinning_timeout); | |
| 255 } | |
| 256 | |
| 257 // Spin to avoid context switching. | |
| 258 // There's a tension between allowing the mutators to run (and rendezvous) | |
| 259 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that | |
| 260 // a mutator might otherwise use profitably to reach a safepoint. Excessive | |
| 261 // spinning by the VM thread on a saturated system can increase rendezvous latency. | |
| 262 // Blocking or yielding incur their own penalties in the form of context switching | |
| 263 // and the resultant loss of $ residency. | |
| 264 // | |
| 265 // Further complicating matters is that yield() does not work as naively expected | |
| 266 // on many platforms -- yield() does not guarantee that any other ready threads | |
| 267 // will run. As such we revert yield_all() after some number of iterations. | |
| 268 // Yield_all() is implemented as a short unconditional sleep on some platforms. | |
| 269 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping | |
| 270 // can actually increase the time it takes the VM thread to detect that a system-wide | |
| 271 // stop-the-world safepoint has been reached. In a pathological scenario such as that | |
| 272 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe. | |
| 273 // In that case the mutators will be stalled waiting for the safepoint to complete and the | |
| 274 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread | |
| 275 // will eventually wake up and detect that all mutators are safe, at which point | |
| 276 // we'll again make progress. | |
| 277 // | |
| 278 // Beware too that that the VMThread typically runs at elevated priority. | |
| 279 // Its default priority is higher than the default mutator priority. | |
| 280 // Obviously, this complicates spinning. | |
| 281 // | |
| 282 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0). | |
| 283 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will. | |
| 284 // | |
| 285 // See the comments in synchronizer.cpp for additional remarks on spinning. | |
| 286 // | |
| 287 // In the future we might: | |
| 288 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning. | |
| 289 // This is tricky as the path used by a thread exiting the JVM (say on | |
| 290 // on JNI call-out) simply stores into its state field. The burden | |
| 291 // is placed on the VM thread, which must poll (spin). | |
| 292 // 2. Find something useful to do while spinning. If the safepoint is GC-related | |
| 293 // we might aggressively scan the stacks of threads that are already safe. | |
| 294 // 3. Use Solaris schedctl to examine the state of the still-running mutators. | |
| 295 // If all the mutators are ONPROC there's no reason to sleep or yield. | |
| 296 // 4. YieldTo() any still-running mutators that are ready but OFFPROC. | |
| 297 // 5. Check system saturation. If the system is not fully saturated then | |
| 298 // simply spin and avoid sleep/yield. | |
| 299 // 6. As still-running mutators rendezvous they could unpark the sleeping | |
| 300 // VMthread. This works well for still-running mutators that become | |
| 301 // safe. The VMthread must still poll for mutators that call-out. | |
| 302 // 7. Drive the policy on time-since-begin instead of iterations. | |
| 303 // 8. Consider making the spin duration a function of the # of CPUs: | |
| 304 // Spin = (((ncpus-1) * M) + K) + F(still_running) | |
| 305 // Alternately, instead of counting iterations of the outer loop | |
| 306 // we could count the # of threads visited in the inner loop, above. | |
| 307 // 9. On windows consider using the return value from SwitchThreadTo() | |
| 308 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions. | |
| 309 | |
| 310 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) { | |
| 311 guarantee (PageArmed == 0, "invariant") ; | |
| 312 PageArmed = 1 ; | |
| 313 os::make_polling_page_unreadable(); | |
| 314 } | |
| 315 | |
| 316 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or | |
| 317 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus) | |
| 318 ++steps ; | |
| 319 if (ncpus > 1 && steps < SafepointSpinBeforeYield) { | |
| 320 SpinPause() ; // MP-Polite spin | |
| 321 } else | |
| 322 if (steps < DeferThrSuspendLoopCount) { | |
| 323 os::NakedYield() ; | |
| 324 } else { | |
| 325 os::yield_all(steps) ; | |
| 326 // Alternately, the VM thread could transiently depress its scheduling priority or | |
| 327 // transiently increase the priority of the tardy mutator(s). | |
| 328 } | |
| 329 | |
| 330 iterations ++ ; | |
| 331 } | |
| 332 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long"); | |
| 333 } | |
| 334 assert(still_running == 0, "sanity check"); | |
| 335 | |
| 336 if (PrintSafepointStatistics) { | |
| 337 update_statistics_on_spin_end(); | |
| 338 } | |
| 339 | |
| 340 // wait until all threads are stopped | |
| 341 while (_waiting_to_block > 0) { | |
| 342 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block); | |
| 343 if (!SafepointTimeout || timeout_error_printed) { | |
| 344 Safepoint_lock->wait(true); // true, means with no safepoint checks | |
| 345 } else { | |
| 346 // Compute remaining time | |
| 347 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos(); | |
| 348 | |
| 349 // If there is no remaining time, then there is an error | |
| 350 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) { | |
| 351 print_safepoint_timeout(_blocking_timeout); | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 assert(_waiting_to_block == 0, "sanity check"); | |
| 356 | |
| 357 #ifndef PRODUCT | |
| 358 if (SafepointTimeout) { | |
| 359 jlong current_time = os::javaTimeNanos(); | |
| 360 if (safepoint_limit_time < current_time) { | |
| 361 tty->print_cr("# SafepointSynchronize: Finished after " | |
| 362 INT64_FORMAT_W(6) " ms", | |
| 363 ((current_time - safepoint_limit_time) / MICROUNITS + | |
| 364 SafepointTimeoutDelay)); | |
| 365 } | |
| 366 } | |
| 367 #endif | |
| 368 | |
| 369 assert((_safepoint_counter & 0x1) == 0, "must be even"); | |
| 370 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
| 371 _safepoint_counter ++; | |
| 372 | |
| 373 // Record state | |
| 374 _state = _synchronized; | |
| 375 | |
| 376 OrderAccess::fence(); | |
| 377 | |
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378 #ifdef ASSERT |
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379 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) { |
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380 // make sure all the threads were visited |
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381 assert(cur->was_visited_for_critical_count(), "missed a thread"); |
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382 } |
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383 #endif // ASSERT |
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384 |
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385 // Update the count of active JNI critical regions |
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386 GC_locker::set_jni_lock_count(_current_jni_active_count); |
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387 |
| 0 | 388 if (TraceSafepoint) { |
| 389 VM_Operation *op = VMThread::vm_operation(); | |
| 390 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation"); | |
| 391 } | |
| 392 | |
| 393 RuntimeService::record_safepoint_synchronized(); | |
| 394 if (PrintSafepointStatistics) { | |
| 395 update_statistics_on_sync_end(os::javaTimeNanos()); | |
| 396 } | |
| 397 | |
| 398 // Call stuff that needs to be run when a safepoint is just about to be completed | |
| 399 do_cleanup_tasks(); | |
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400 |
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401 if (PrintSafepointStatistics) { |
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402 // Record how much time spend on the above cleanup tasks |
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403 update_statistics_on_cleanup_end(os::javaTimeNanos()); |
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404 } |
| 0 | 405 } |
| 406 | |
| 407 // Wake up all threads, so they are ready to resume execution after the safepoint | |
| 408 // operation has been carried out | |
| 409 void SafepointSynchronize::end() { | |
| 410 | |
| 411 assert(Threads_lock->owned_by_self(), "must hold Threads_lock"); | |
| 412 assert((_safepoint_counter & 0x1) == 1, "must be odd"); | |
| 413 _safepoint_counter ++; | |
| 414 // memory fence isn't required here since an odd _safepoint_counter | |
| 415 // value can do no harm and a fence is issued below anyway. | |
| 416 | |
| 417 DEBUG_ONLY(Thread* myThread = Thread::current();) | |
| 418 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint"); | |
| 419 | |
| 420 if (PrintSafepointStatistics) { | |
| 421 end_statistics(os::javaTimeNanos()); | |
| 422 } | |
| 423 | |
| 424 #ifdef ASSERT | |
| 425 // A pending_exception cannot be installed during a safepoint. The threads | |
| 426 // may install an async exception after they come back from a safepoint into | |
| 427 // pending_exception after they unblock. But that should happen later. | |
| 428 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
| 429 assert (!(cur->has_pending_exception() && | |
| 430 cur->safepoint_state()->is_at_poll_safepoint()), | |
| 431 "safepoint installed a pending exception"); | |
| 432 } | |
| 433 #endif // ASSERT | |
| 434 | |
| 435 if (PageArmed) { | |
| 436 // Make polling safepoint aware | |
| 437 os::make_polling_page_readable(); | |
| 438 PageArmed = 0 ; | |
| 439 } | |
| 440 | |
| 441 // Remove safepoint check from interpreter | |
| 442 Interpreter::ignore_safepoints(); | |
| 443 | |
| 444 { | |
| 445 MutexLocker mu(Safepoint_lock); | |
| 446 | |
| 447 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization"); | |
| 448 | |
| 449 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method | |
| 450 // when they get restarted. | |
| 451 _state = _not_synchronized; | |
| 452 OrderAccess::fence(); | |
| 453 | |
| 454 if (TraceSafepoint) { | |
| 455 tty->print_cr("Leaving safepoint region"); | |
| 456 } | |
| 457 | |
| 458 // Start suspended threads | |
| 459 for(JavaThread *current = Threads::first(); current; current = current->next()) { | |
| 605 | 460 // A problem occurring on Solaris is when attempting to restart threads |
| 0 | 461 // the first #cpus - 1 go well, but then the VMThread is preempted when we get |
| 462 // to the next one (since it has been running the longest). We then have | |
| 463 // to wait for a cpu to become available before we can continue restarting | |
| 464 // threads. | |
| 465 // FIXME: This causes the performance of the VM to degrade when active and with | |
| 466 // large numbers of threads. Apparently this is due to the synchronous nature | |
| 467 // of suspending threads. | |
| 468 // | |
| 469 // TODO-FIXME: the comments above are vestigial and no longer apply. | |
| 470 // Furthermore, using solaris' schedctl in this particular context confers no benefit | |
| 471 if (VMThreadHintNoPreempt) { | |
| 472 os::hint_no_preempt(); | |
| 473 } | |
| 474 ThreadSafepointState* cur_state = current->safepoint_state(); | |
| 475 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint"); | |
| 476 cur_state->restart(); | |
| 477 assert(cur_state->is_running(), "safepoint state has not been reset"); | |
| 478 } | |
| 479 | |
| 480 RuntimeService::record_safepoint_end(); | |
| 481 | |
| 482 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads | |
| 483 // blocked in signal_thread_blocked | |
| 484 Threads_lock->unlock(); | |
| 485 | |
| 486 } | |
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487 #if INCLUDE_ALL_GCS |
| 0 | 488 // If there are any concurrent GC threads resume them. |
| 489 if (UseConcMarkSweepGC) { | |
| 490 ConcurrentMarkSweepThread::desynchronize(false); | |
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491 } else if (UseG1GC) { |
| 20192 | 492 SuspendibleThreadSet::desynchronize(); |
| 0 | 493 } |
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494 #endif // INCLUDE_ALL_GCS |
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495 // record this time so VMThread can keep track how much time has elasped |
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496 // since last safepoint. |
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497 _end_of_last_safepoint = os::javaTimeMillis(); |
| 0 | 498 } |
| 499 | |
| 500 bool SafepointSynchronize::is_cleanup_needed() { | |
| 501 // Need a safepoint if some inline cache buffers is non-empty | |
| 502 if (!InlineCacheBuffer::is_empty()) return true; | |
| 503 return false; | |
| 504 } | |
| 505 | |
| 506 | |
| 507 | |
| 508 // Various cleaning tasks that should be done periodically at safepoints | |
| 509 void SafepointSynchronize::do_cleanup_tasks() { | |
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510 { |
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511 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); |
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512 ObjectSynchronizer::deflate_idle_monitors(); |
| 0 | 513 } |
| 514 | |
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515 { |
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516 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); |
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517 InlineCacheBuffer::update_inline_caches(); |
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518 } |
| 1783 | 519 { |
| 520 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime); | |
| 521 CompilationPolicy::policy()->do_safepoint_work(); | |
| 0 | 522 } |
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523 |
| 6162 | 524 { |
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525 TraceTime t4("mark nmethods", TraceSafepointCleanupTime); |
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526 NMethodSweeper::mark_active_nmethods(); |
| 6162 | 527 } |
| 528 | |
| 529 if (SymbolTable::needs_rehashing()) { | |
| 530 TraceTime t5("rehashing symbol table", TraceSafepointCleanupTime); | |
| 531 SymbolTable::rehash_table(); | |
| 532 } | |
| 533 | |
| 534 if (StringTable::needs_rehashing()) { | |
| 535 TraceTime t6("rehashing string table", TraceSafepointCleanupTime); | |
| 536 StringTable::rehash_table(); | |
| 537 } | |
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538 |
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539 // rotate log files? |
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540 if (UseGCLogFileRotation) { |
| 17827 | 541 gclog_or_tty->rotate_log(false); |
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542 } |
| 6197 | 543 |
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544 { |
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545 // CMS delays purging the CLDG until the beginning of the next safepoint and to |
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546 // make sure concurrent sweep is done |
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547 TraceTime t7("purging class loader data graph", TraceSafepointCleanupTime); |
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548 ClassLoaderDataGraph::purge_if_needed(); |
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549 } |
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550 |
| 6197 | 551 if (MemTracker::is_on()) { |
| 552 MemTracker::sync(); | |
| 553 } | |
| 0 | 554 } |
| 555 | |
| 556 | |
| 557 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) { | |
| 558 switch(state) { | |
| 559 case _thread_in_native: | |
| 560 // native threads are safe if they have no java stack or have walkable stack | |
| 561 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable(); | |
| 562 | |
| 563 // blocked threads should have already have walkable stack | |
| 564 case _thread_blocked: | |
| 565 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable"); | |
| 566 return true; | |
| 567 | |
| 568 default: | |
| 569 return false; | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 | |
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574 // See if the thread is running inside a lazy critical native and |
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575 // update the thread critical count if so. Also set a suspend flag to |
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576 // cause the native wrapper to return into the JVM to do the unlock |
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577 // once the native finishes. |
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578 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) { |
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579 if (state == _thread_in_native && |
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580 thread->has_last_Java_frame() && |
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581 thread->frame_anchor()->walkable()) { |
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582 // This thread might be in a critical native nmethod so look at |
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583 // the top of the stack and increment the critical count if it |
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584 // is. |
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585 frame wrapper_frame = thread->last_frame(); |
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586 CodeBlob* stub_cb = wrapper_frame.cb(); |
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587 if (stub_cb != NULL && |
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588 stub_cb->is_nmethod() && |
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589 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) { |
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590 // A thread could potentially be in a critical native across |
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591 // more than one safepoint, so only update the critical state on |
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592 // the first one. When it returns it will perform the unlock. |
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593 if (!thread->do_critical_native_unlock()) { |
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594 #ifdef ASSERT |
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595 if (!thread->in_critical()) { |
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596 GC_locker::increment_debug_jni_lock_count(); |
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597 } |
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598 #endif |
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599 thread->enter_critical(); |
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600 // Make sure the native wrapper calls back on return to |
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601 // perform the needed critical unlock. |
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602 thread->set_critical_native_unlock(); |
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603 } |
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604 } |
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605 } |
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606 } |
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607 |
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608 |
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609 |
| 0 | 610 // ------------------------------------------------------------------------------------------------------- |
| 611 // Implementation of Safepoint callback point | |
| 612 | |
| 613 void SafepointSynchronize::block(JavaThread *thread) { | |
| 614 assert(thread != NULL, "thread must be set"); | |
| 615 assert(thread->is_Java_thread(), "not a Java thread"); | |
| 616 | |
| 617 // Threads shouldn't block if they are in the middle of printing, but... | |
| 618 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id()); | |
| 619 | |
| 620 // Only bail from the block() call if the thread is gone from the | |
| 621 // thread list; starting to exit should still block. | |
| 622 if (thread->is_terminated()) { | |
| 623 // block current thread if we come here from native code when VM is gone | |
| 624 thread->block_if_vm_exited(); | |
| 625 | |
| 626 // otherwise do nothing | |
| 627 return; | |
| 628 } | |
| 629 | |
| 630 JavaThreadState state = thread->thread_state(); | |
| 631 thread->frame_anchor()->make_walkable(thread); | |
| 632 | |
| 633 // Check that we have a valid thread_state at this point | |
| 634 switch(state) { | |
| 635 case _thread_in_vm_trans: | |
| 636 case _thread_in_Java: // From compiled code | |
| 637 | |
| 638 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case, | |
| 639 // we pretend we are still in the VM. | |
| 640 thread->set_thread_state(_thread_in_vm); | |
| 641 | |
| 642 if (is_synchronizing()) { | |
| 643 Atomic::inc (&TryingToBlock) ; | |
| 644 } | |
| 645 | |
| 646 // We will always be holding the Safepoint_lock when we are examine the state | |
| 647 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and | |
| 648 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code | |
| 649 Safepoint_lock->lock_without_safepoint_check(); | |
| 650 if (is_synchronizing()) { | |
| 651 // Decrement the number of threads to wait for and signal vm thread | |
| 652 assert(_waiting_to_block > 0, "sanity check"); | |
| 653 _waiting_to_block--; | |
| 654 thread->safepoint_state()->set_has_called_back(true); | |
| 655 | |
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656 DEBUG_ONLY(thread->set_visited_for_critical_count(true)); |
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657 if (thread->in_critical()) { |
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658 // Notice that this thread is in a critical section |
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659 increment_jni_active_count(); |
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660 } |
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661 |
| 0 | 662 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread |
| 663 if (_waiting_to_block == 0) { | |
| 664 Safepoint_lock->notify_all(); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 // We transition the thread to state _thread_blocked here, but | |
| 669 // we can't do our usual check for external suspension and then | |
| 670 // self-suspend after the lock_without_safepoint_check() call | |
| 671 // below because we are often called during transitions while | |
| 672 // we hold different locks. That would leave us suspended while | |
| 673 // holding a resource which results in deadlocks. | |
| 674 thread->set_thread_state(_thread_blocked); | |
| 675 Safepoint_lock->unlock(); | |
| 676 | |
| 677 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during | |
| 678 // the entire safepoint, the threads will all line up here during the safepoint. | |
| 679 Threads_lock->lock_without_safepoint_check(); | |
| 680 // restore original state. This is important if the thread comes from compiled code, so it | |
| 681 // will continue to execute with the _thread_in_Java state. | |
| 682 thread->set_thread_state(state); | |
| 683 Threads_lock->unlock(); | |
| 684 break; | |
| 685 | |
| 686 case _thread_in_native_trans: | |
| 687 case _thread_blocked_trans: | |
| 688 case _thread_new_trans: | |
| 689 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) { | |
| 690 thread->print_thread_state(); | |
| 691 fatal("Deadlock in safepoint code. " | |
| 692 "Should have called back to the VM before blocking."); | |
| 693 } | |
| 694 | |
| 695 // We transition the thread to state _thread_blocked here, but | |
| 696 // we can't do our usual check for external suspension and then | |
| 697 // self-suspend after the lock_without_safepoint_check() call | |
| 698 // below because we are often called during transitions while | |
| 699 // we hold different locks. That would leave us suspended while | |
| 700 // holding a resource which results in deadlocks. | |
| 701 thread->set_thread_state(_thread_blocked); | |
| 702 | |
| 703 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence, | |
| 704 // the safepoint code might still be waiting for it to block. We need to change the state here, | |
| 705 // so it can see that it is at a safepoint. | |
| 706 | |
| 707 // Block until the safepoint operation is completed. | |
| 708 Threads_lock->lock_without_safepoint_check(); | |
| 709 | |
| 710 // Restore state | |
| 711 thread->set_thread_state(state); | |
| 712 | |
| 713 Threads_lock->unlock(); | |
| 714 break; | |
| 715 | |
| 716 default: | |
|
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717 fatal(err_msg("Illegal threadstate encountered: %d", state)); |
| 0 | 718 } |
| 719 | |
| 720 // Check for pending. async. exceptions or suspends - except if the | |
| 721 // thread was blocked inside the VM. has_special_runtime_exit_condition() | |
| 722 // is called last since it grabs a lock and we only want to do that when | |
| 723 // we must. | |
| 724 // | |
| 725 // Note: we never deliver an async exception at a polling point as the | |
| 726 // compiler may not have an exception handler for it. The polling | |
| 727 // code will notice the async and deoptimize and the exception will | |
| 728 // be delivered. (Polling at a return point is ok though). Sure is | |
| 729 // a lot of bother for a deprecated feature... | |
| 730 // | |
| 731 // We don't deliver an async exception if the thread state is | |
| 732 // _thread_in_native_trans so JNI functions won't be called with | |
| 733 // a surprising pending exception. If the thread state is going back to java, | |
| 734 // async exception is checked in check_special_condition_for_native_trans(). | |
| 735 | |
| 736 if (state != _thread_blocked_trans && | |
| 737 state != _thread_in_vm_trans && | |
| 738 thread->has_special_runtime_exit_condition()) { | |
| 739 thread->handle_special_runtime_exit_condition( | |
| 740 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans)); | |
| 741 } | |
| 742 } | |
| 743 | |
| 744 // ------------------------------------------------------------------------------------------------------ | |
| 745 // Exception handlers | |
| 746 | |
| 747 #ifndef PRODUCT | |
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748 |
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749 #ifdef SPARC |
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750 |
| 0 | 751 #ifdef _LP64 |
| 752 #define PTR_PAD "" | |
| 753 #else | |
| 754 #define PTR_PAD " " | |
| 755 #endif | |
| 756 | |
| 757 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) { | |
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758 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false; |
| 0 | 759 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s", |
| 760 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
| 761 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
| 762 } | |
| 763 | |
| 764 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) { | |
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765 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false; |
| 0 | 766 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s", |
| 767 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!', | |
| 768 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" ")); | |
| 769 } | |
| 770 | |
| 771 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) { | |
| 772 #ifdef _LP64 | |
| 773 tty->print_cr("--------+------address-----+------before-----------+-------after----------+"); | |
| 774 const int incr = 1; // Increment to skip a long, in units of intptr_t | |
| 775 #else | |
| 776 tty->print_cr("--------+--address-+------before-----------+-------after----------+"); | |
| 777 const int incr = 2; // Increment to skip a long, in units of intptr_t | |
| 778 #endif | |
| 779 tty->print_cr("---SP---|"); | |
| 780 for( int i=0; i<16; i++ ) { | |
| 781 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
| 782 tty->print_cr("--------|"); | |
| 783 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) { | |
| 784 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
| 785 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); | |
| 786 tty->print_cr("--------|"); | |
| 787 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; | |
| 788 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; | |
| 789 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; | |
| 790 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; | |
| 791 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp); | |
| 792 old_sp += incr; new_sp += incr; was_oops += incr; | |
| 793 // Skip the floats | |
| 794 tty->print_cr("--Float-|"PTR_FORMAT,new_sp); | |
| 795 tty->print_cr("---FP---|"); | |
| 796 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32; | |
| 797 for( int i2=0; i2<16; i2++ ) { | |
| 798 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); } | |
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799 tty->cr(); |
| 0 | 800 } |
| 801 #endif // SPARC | |
| 802 #endif // PRODUCT | |
| 803 | |
| 804 | |
| 805 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { | |
| 806 assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); | |
| 807 assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); | |
| 808 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization"); | |
| 809 | |
| 810 // Uncomment this to get some serious before/after printing of the | |
| 811 // Sparc safepoint-blob frame structure. | |
| 812 /* | |
| 813 intptr_t* sp = thread->last_Java_sp(); | |
| 814 intptr_t stack_copy[150]; | |
| 815 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i]; | |
| 816 bool was_oops[150]; | |
| 817 for( int i=0; i<150; i++ ) | |
| 818 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false; | |
| 819 */ | |
| 820 | |
| 821 if (ShowSafepointMsgs) { | |
| 822 tty->print("handle_polling_page_exception: "); | |
| 823 } | |
| 824 | |
| 825 if (PrintSafepointStatistics) { | |
| 826 inc_page_trap_count(); | |
| 827 } | |
| 828 | |
| 829 ThreadSafepointState* state = thread->safepoint_state(); | |
| 830 | |
| 831 state->handle_polling_page_exception(); | |
| 832 // print_me(sp,stack_copy,was_oops); | |
| 833 } | |
| 834 | |
| 835 | |
| 836 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) { | |
| 837 if (!timeout_error_printed) { | |
| 838 timeout_error_printed = true; | |
| 839 // Print out the thread infor which didn't reach the safepoint for debugging | |
| 840 // purposes (useful when there are lots of threads in the debugger). | |
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841 tty->cr(); |
| 0 | 842 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:"); |
| 843 if (reason == _spinning_timeout) { | |
| 844 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint."); | |
| 845 } else if (reason == _blocking_timeout) { | |
| 846 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop."); | |
| 847 } | |
| 848 | |
| 849 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:"); | |
| 850 ThreadSafepointState *cur_state; | |
| 851 ResourceMark rm; | |
| 852 for(JavaThread *cur_thread = Threads::first(); cur_thread; | |
| 853 cur_thread = cur_thread->next()) { | |
| 854 cur_state = cur_thread->safepoint_state(); | |
| 855 | |
| 856 if (cur_thread->thread_state() != _thread_blocked && | |
| 857 ((reason == _spinning_timeout && cur_state->is_running()) || | |
| 858 (reason == _blocking_timeout && !cur_state->has_called_back()))) { | |
| 859 tty->print("# "); | |
| 860 cur_thread->print(); | |
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861 tty->cr(); |
| 0 | 862 } |
| 863 } | |
| 864 tty->print_cr("# SafepointSynchronize::begin: (End of list)"); | |
| 865 } | |
| 866 | |
| 867 // To debug the long safepoint, specify both DieOnSafepointTimeout & | |
| 868 // ShowMessageBoxOnError. | |
| 869 if (DieOnSafepointTimeout) { | |
| 870 char msg[1024]; | |
| 871 VM_Operation *op = VMThread::vm_operation(); | |
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872 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.", |
| 0 | 873 SafepointTimeoutDelay, |
| 874 op != NULL ? op->name() : "no vm operation"); | |
| 875 fatal(msg); | |
| 876 } | |
| 877 } | |
| 878 | |
| 879 | |
| 880 // ------------------------------------------------------------------------------------------------------- | |
| 881 // Implementation of ThreadSafepointState | |
| 882 | |
| 883 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) { | |
| 884 _thread = thread; | |
| 885 _type = _running; | |
| 886 _has_called_back = false; | |
| 887 _at_poll_safepoint = false; | |
| 888 } | |
| 889 | |
| 890 void ThreadSafepointState::create(JavaThread *thread) { | |
| 891 ThreadSafepointState *state = new ThreadSafepointState(thread); | |
| 892 thread->set_safepoint_state(state); | |
| 893 } | |
| 894 | |
| 895 void ThreadSafepointState::destroy(JavaThread *thread) { | |
| 896 if (thread->safepoint_state()) { | |
| 897 delete(thread->safepoint_state()); | |
| 898 thread->set_safepoint_state(NULL); | |
| 899 } | |
| 900 } | |
| 901 | |
| 902 void ThreadSafepointState::examine_state_of_thread() { | |
| 903 assert(is_running(), "better be running or just have hit safepoint poll"); | |
| 904 | |
| 905 JavaThreadState state = _thread->thread_state(); | |
| 906 | |
|
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907 // Save the state at the start of safepoint processing. |
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908 _orig_thread_state = state; |
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909 |
| 0 | 910 // Check for a thread that is suspended. Note that thread resume tries |
| 911 // to grab the Threads_lock which we own here, so a thread cannot be | |
| 912 // resumed during safepoint synchronization. | |
| 913 | |
| 979 | 914 // We check to see if this thread is suspended without locking to |
| 915 // avoid deadlocking with a third thread that is waiting for this | |
| 916 // thread to be suspended. The third thread can notice the safepoint | |
| 917 // that we're trying to start at the beginning of its SR_lock->wait() | |
| 918 // call. If that happens, then the third thread will block on the | |
| 919 // safepoint while still holding the underlying SR_lock. We won't be | |
| 920 // able to get the SR_lock and we'll deadlock. | |
| 921 // | |
| 922 // We don't need to grab the SR_lock here for two reasons: | |
| 923 // 1) The suspend flags are both volatile and are set with an | |
| 924 // Atomic::cmpxchg() call so we should see the suspended | |
| 925 // state right away. | |
| 926 // 2) We're being called from the safepoint polling loop; if | |
| 927 // we don't see the suspended state on this iteration, then | |
| 928 // we'll come around again. | |
| 929 // | |
| 930 bool is_suspended = _thread->is_ext_suspended(); | |
| 0 | 931 if (is_suspended) { |
| 932 roll_forward(_at_safepoint); | |
| 933 return; | |
| 934 } | |
| 935 | |
| 936 // Some JavaThread states have an initial safepoint state of | |
| 937 // running, but are actually at a safepoint. We will happily | |
| 938 // agree and update the safepoint state here. | |
| 939 if (SafepointSynchronize::safepoint_safe(_thread, state)) { | |
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940 SafepointSynchronize::check_for_lazy_critical_native(_thread, state); |
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941 roll_forward(_at_safepoint); |
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942 return; |
| 0 | 943 } |
| 944 | |
| 945 if (state == _thread_in_vm) { | |
| 946 roll_forward(_call_back); | |
| 947 return; | |
| 948 } | |
| 949 | |
| 950 // All other thread states will continue to run until they | |
| 951 // transition and self-block in state _blocked | |
| 952 // Safepoint polling in compiled code causes the Java threads to do the same. | |
| 953 // Note: new threads may require a malloc so they must be allowed to finish | |
| 954 | |
| 955 assert(is_running(), "examine_state_of_thread on non-running thread"); | |
| 956 return; | |
| 957 } | |
| 958 | |
| 959 // Returns true is thread could not be rolled forward at present position. | |
| 960 void ThreadSafepointState::roll_forward(suspend_type type) { | |
| 961 _type = type; | |
| 962 | |
| 963 switch(_type) { | |
| 964 case _at_safepoint: | |
| 965 SafepointSynchronize::signal_thread_at_safepoint(); | |
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966 DEBUG_ONLY(_thread->set_visited_for_critical_count(true)); |
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967 if (_thread->in_critical()) { |
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968 // Notice that this thread is in a critical section |
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969 SafepointSynchronize::increment_jni_active_count(); |
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970 } |
| 0 | 971 break; |
| 972 | |
| 973 case _call_back: | |
| 974 set_has_called_back(false); | |
| 975 break; | |
| 976 | |
| 977 case _running: | |
| 978 default: | |
| 979 ShouldNotReachHere(); | |
| 980 } | |
| 981 } | |
| 982 | |
| 983 void ThreadSafepointState::restart() { | |
| 984 switch(type()) { | |
| 985 case _at_safepoint: | |
| 986 case _call_back: | |
| 987 break; | |
| 988 | |
| 989 case _running: | |
| 990 default: | |
| 991 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d", | |
| 992 _thread, _type); | |
| 993 _thread->print(); | |
| 994 ShouldNotReachHere(); | |
| 995 } | |
| 996 _type = _running; | |
| 997 set_has_called_back(false); | |
| 998 } | |
| 999 | |
| 1000 | |
| 1001 void ThreadSafepointState::print_on(outputStream *st) const { | |
| 1002 const char *s; | |
| 1003 | |
| 1004 switch(_type) { | |
| 1005 case _running : s = "_running"; break; | |
| 1006 case _at_safepoint : s = "_at_safepoint"; break; | |
| 1007 case _call_back : s = "_call_back"; break; | |
| 1008 default: | |
| 1009 ShouldNotReachHere(); | |
| 1010 } | |
| 1011 | |
| 1012 st->print_cr("Thread: " INTPTR_FORMAT | |
| 1013 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d", | |
| 1014 _thread, _thread->osthread()->thread_id(), s, _has_called_back, | |
| 1015 _at_poll_safepoint); | |
| 1016 | |
| 1017 _thread->print_thread_state_on(st); | |
| 1018 } | |
| 1019 | |
| 1020 | |
| 1021 // --------------------------------------------------------------------------------------------------------------------- | |
| 1022 | |
| 1023 // Block the thread at the safepoint poll or poll return. | |
| 1024 void ThreadSafepointState::handle_polling_page_exception() { | |
| 1025 | |
| 1026 // Check state. block() will set thread state to thread_in_vm which will | |
| 1027 // cause the safepoint state _type to become _call_back. | |
| 1028 assert(type() == ThreadSafepointState::_running, | |
| 1029 "polling page exception on thread not running state"); | |
| 1030 | |
| 1031 // Step 1: Find the nmethod from the return address | |
| 1032 if (ShowSafepointMsgs && Verbose) { | |
| 1033 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc()); | |
| 1034 } | |
| 1035 address real_return_addr = thread()->saved_exception_pc(); | |
| 1036 | |
| 1037 CodeBlob *cb = CodeCache::find_blob(real_return_addr); | |
| 1038 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod"); | |
| 1039 nmethod* nm = (nmethod*)cb; | |
| 1040 | |
| 1041 // Find frame of caller | |
| 1042 frame stub_fr = thread()->last_frame(); | |
| 1043 CodeBlob* stub_cb = stub_fr.cb(); | |
| 1044 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub"); | |
| 1045 RegisterMap map(thread(), true); | |
| 1046 frame caller_fr = stub_fr.sender(&map); | |
| 1047 | |
| 1048 // Should only be poll_return or poll | |
| 1049 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" ); | |
| 1050 | |
| 1051 // This is a poll immediately before a return. The exception handling code | |
| 1052 // has already had the effect of causing the return to occur, so the execution | |
| 1053 // will continue immediately after the call. In addition, the oopmap at the | |
| 1054 // return point does not mark the return value as an oop (if it is), so | |
| 1055 // it needs a handle here to be updated. | |
| 1056 if( nm->is_at_poll_return(real_return_addr) ) { | |
| 1057 // See if return type is an oop. | |
| 1058 bool return_oop = nm->method()->is_returning_oop(); | |
| 1059 Handle return_value; | |
| 1060 if (return_oop) { | |
| 1061 // The oop result has been saved on the stack together with all | |
| 1062 // the other registers. In order to preserve it over GCs we need | |
| 1063 // to keep it in a handle. | |
| 1064 oop result = caller_fr.saved_oop_result(&map); | |
| 1065 assert(result == NULL || result->is_oop(), "must be oop"); | |
| 1066 return_value = Handle(thread(), result); | |
| 1067 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); | |
| 1068 } | |
| 1069 | |
| 1070 // Block the thread | |
| 1071 SafepointSynchronize::block(thread()); | |
| 1072 | |
| 1073 // restore oop result, if any | |
| 1074 if (return_oop) { | |
| 1075 caller_fr.set_saved_oop_result(&map, return_value()); | |
| 1076 } | |
| 1077 } | |
| 1078 | |
| 1079 // This is a safepoint poll. Verify the return address and block. | |
| 1080 else { | |
| 1081 set_at_poll_safepoint(true); | |
| 1082 | |
| 1083 // verify the blob built the "return address" correctly | |
| 1084 assert(real_return_addr == caller_fr.pc(), "must match"); | |
| 1085 | |
| 1086 // Block the thread | |
| 1087 SafepointSynchronize::block(thread()); | |
| 1088 set_at_poll_safepoint(false); | |
| 1089 | |
| 1090 // If we have a pending async exception deoptimize the frame | |
| 1091 // as otherwise we may never deliver it. | |
| 1092 if (thread()->has_async_condition()) { | |
| 1093 ThreadInVMfromJavaNoAsyncException __tiv(thread()); | |
|
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1094 Deoptimization::deoptimize_frame(thread(), caller_fr.id()); |
| 0 | 1095 } |
| 1096 | |
| 1097 // If an exception has been installed we must check for a pending deoptimization | |
| 1098 // Deoptimize frame if exception has been thrown. | |
| 1099 | |
| 1100 if (thread()->has_pending_exception() ) { | |
| 1101 RegisterMap map(thread(), true); | |
| 1102 frame caller_fr = stub_fr.sender(&map); | |
| 1103 if (caller_fr.is_deoptimized_frame()) { | |
| 1104 // The exception patch will destroy registers that are still | |
| 1105 // live and will be needed during deoptimization. Defer the | |
| 1106 // Async exception should have defered the exception until the | |
| 1107 // next safepoint which will be detected when we get into | |
| 1108 // the interpreter so if we have an exception now things | |
| 1109 // are messed up. | |
| 1110 | |
| 1111 fatal("Exception installed and deoptimization is pending"); | |
| 1112 } | |
| 1113 } | |
| 1114 } | |
| 1115 } | |
| 1116 | |
| 1117 | |
| 1118 // | |
| 1119 // Statistics & Instrumentations | |
| 1120 // | |
| 1121 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL; | |
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1122 jlong SafepointSynchronize::_safepoint_begin_time = 0; |
| 0 | 1123 int SafepointSynchronize::_cur_stat_index = 0; |
| 1124 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating]; | |
| 1125 julong SafepointSynchronize::_coalesced_vmop_count = 0; | |
| 1126 jlong SafepointSynchronize::_max_sync_time = 0; | |
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1127 jlong SafepointSynchronize::_max_vmop_time = 0; |
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1128 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f; |
| 0 | 1129 |
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1130 static jlong cleanup_end_time = 0; |
| 0 | 1131 static bool need_to_track_page_armed_status = false; |
| 1132 static bool init_done = false; | |
| 1133 | |
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1134 // Helper method to print the header. |
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1135 static void print_header() { |
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1136 tty->print(" vmop " |
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1137 "[threads: total initially_running wait_to_block] "); |
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1138 tty->print("[time: spin block sync cleanup vmop] "); |
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1139 |
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1140 // no page armed status printed out if it is always armed. |
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1141 if (need_to_track_page_armed_status) { |
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1142 tty->print("page_armed "); |
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1143 } |
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1144 |
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1145 tty->print_cr("page_trap_count"); |
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1146 } |
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1147 |
| 0 | 1148 void SafepointSynchronize::deferred_initialize_stat() { |
| 1149 if (init_done) return; | |
| 1150 | |
| 1151 if (PrintSafepointStatisticsCount <= 0) { | |
| 1152 fatal("Wrong PrintSafepointStatisticsCount"); | |
| 1153 } | |
| 1154 | |
| 1155 // If PrintSafepointStatisticsTimeout is specified, the statistics data will | |
| 1156 // be printed right away, in which case, _safepoint_stats will regress to | |
| 1157 // a single element array. Otherwise, it is a circular ring buffer with default | |
| 1158 // size of PrintSafepointStatisticsCount. | |
| 1159 int stats_array_size; | |
| 1160 if (PrintSafepointStatisticsTimeout > 0) { | |
| 1161 stats_array_size = 1; | |
| 1162 PrintSafepointStatistics = true; | |
| 1163 } else { | |
| 1164 stats_array_size = PrintSafepointStatisticsCount; | |
| 1165 } | |
| 1166 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size | |
| 6197 | 1167 * sizeof(SafepointStats), mtInternal); |
| 0 | 1168 guarantee(_safepoint_stats != NULL, |
| 1169 "not enough memory for safepoint instrumentation data"); | |
| 1170 | |
| 1171 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) { | |
| 1172 need_to_track_page_armed_status = true; | |
| 1173 } | |
| 1174 init_done = true; | |
| 1175 } | |
| 1176 | |
| 1177 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) { | |
| 1003 | 1178 assert(init_done, "safepoint statistics array hasn't been initialized"); |
| 0 | 1179 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
| 1180 | |
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1181 spstat->_time_stamp = _ts_of_current_safepoint; |
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1182 |
| 0 | 1183 VM_Operation *op = VMThread::vm_operation(); |
| 1184 spstat->_vmop_type = (op != NULL ? op->type() : -1); | |
| 1185 if (op != NULL) { | |
| 1186 _safepoint_reasons[spstat->_vmop_type]++; | |
| 1187 } | |
| 1188 | |
| 1189 spstat->_nof_total_threads = nof_threads; | |
| 1190 spstat->_nof_initial_running_threads = nof_running; | |
| 1191 spstat->_nof_threads_hit_page_trap = 0; | |
| 1192 | |
| 1193 // Records the start time of spinning. The real time spent on spinning | |
| 1194 // will be adjusted when spin is done. Same trick is applied for time | |
| 1195 // spent on waiting for threads to block. | |
| 1196 if (nof_running != 0) { | |
| 1197 spstat->_time_to_spin = os::javaTimeNanos(); | |
| 1198 } else { | |
| 1199 spstat->_time_to_spin = 0; | |
| 1200 } | |
| 1201 } | |
| 1202 | |
| 1203 void SafepointSynchronize::update_statistics_on_spin_end() { | |
| 1204 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
| 1205 | |
| 1206 jlong cur_time = os::javaTimeNanos(); | |
| 1207 | |
| 1208 spstat->_nof_threads_wait_to_block = _waiting_to_block; | |
| 1209 if (spstat->_nof_initial_running_threads != 0) { | |
| 1210 spstat->_time_to_spin = cur_time - spstat->_time_to_spin; | |
| 1211 } | |
| 1212 | |
| 1213 if (need_to_track_page_armed_status) { | |
| 1214 spstat->_page_armed = (PageArmed == 1); | |
| 1215 } | |
| 1216 | |
| 1217 // Records the start time of waiting for to block. Updated when block is done. | |
| 1218 if (_waiting_to_block != 0) { | |
| 1219 spstat->_time_to_wait_to_block = cur_time; | |
| 1220 } else { | |
| 1221 spstat->_time_to_wait_to_block = 0; | |
| 1222 } | |
| 1223 } | |
| 1224 | |
| 1225 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) { | |
| 1226 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
| 1227 | |
| 1228 if (spstat->_nof_threads_wait_to_block != 0) { | |
| 1229 spstat->_time_to_wait_to_block = end_time - | |
| 1230 spstat->_time_to_wait_to_block; | |
| 1231 } | |
| 1232 | |
| 1233 // Records the end time of sync which will be used to calculate the total | |
| 1234 // vm operation time. Again, the real time spending in syncing will be deducted | |
| 1235 // from the start of the sync time later when end_statistics is called. | |
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1236 spstat->_time_to_sync = end_time - _safepoint_begin_time; |
| 0 | 1237 if (spstat->_time_to_sync > _max_sync_time) { |
| 1238 _max_sync_time = spstat->_time_to_sync; | |
| 1239 } | |
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1240 |
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1241 spstat->_time_to_do_cleanups = end_time; |
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1242 } |
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1243 |
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1244 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) { |
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1245 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; |
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1246 |
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1247 // Record how long spent in cleanup tasks. |
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1248 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups; |
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1249 |
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1250 cleanup_end_time = end_time; |
| 0 | 1251 } |
| 1252 | |
| 1253 void SafepointSynchronize::end_statistics(jlong vmop_end_time) { | |
| 1254 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
| 1255 | |
| 1256 // Update the vm operation time. | |
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1257 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time; |
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1258 if (spstat->_time_to_exec_vmop > _max_vmop_time) { |
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1259 _max_vmop_time = spstat->_time_to_exec_vmop; |
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1260 } |
| 0 | 1261 // Only the sync time longer than the specified |
| 1262 // PrintSafepointStatisticsTimeout will be printed out right away. | |
| 1263 // By default, it is -1 meaning all samples will be put into the list. | |
| 1264 if ( PrintSafepointStatisticsTimeout > 0) { | |
| 1265 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
| 1266 print_statistics(); | |
| 1267 } | |
| 1268 } else { | |
| 1269 // The safepoint statistics will be printed out when the _safepoin_stats | |
| 1270 // array fills up. | |
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1271 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) { |
| 0 | 1272 print_statistics(); |
| 1273 _cur_stat_index = 0; | |
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1274 } else { |
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1275 _cur_stat_index++; |
| 0 | 1276 } |
| 1277 } | |
| 1278 } | |
| 1279 | |
| 1280 void SafepointSynchronize::print_statistics() { | |
| 1281 SafepointStats* sstats = _safepoint_stats; | |
| 1282 | |
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1283 for (int index = 0; index <= _cur_stat_index; index++) { |
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1284 if (index % 30 == 0) { |
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1285 print_header(); |
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1286 } |
| 0 | 1287 sstats = &_safepoint_stats[index]; |
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1288 tty->print("%.3f: ", sstats->_time_stamp); |
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1289 tty->print("%-26s [" |
| 0 | 1290 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15) |
|
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1291 " ] ", |
| 0 | 1292 sstats->_vmop_type == -1 ? "no vm operation" : |
| 1293 VM_Operation::name(sstats->_vmop_type), | |
| 1294 sstats->_nof_total_threads, | |
| 1295 sstats->_nof_initial_running_threads, | |
| 1296 sstats->_nof_threads_wait_to_block); | |
| 1297 // "/ MICROUNITS " is to convert the unit from nanos to millis. | |
|
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1298 tty->print(" [" |
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1299 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1300 INT64_FORMAT_W(6)INT64_FORMAT_W(6) |
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1301 INT64_FORMAT_W(6)" ] ", |
| 0 | 1302 sstats->_time_to_spin / MICROUNITS, |
| 1303 sstats->_time_to_wait_to_block / MICROUNITS, | |
| 1304 sstats->_time_to_sync / MICROUNITS, | |
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1305 sstats->_time_to_do_cleanups / MICROUNITS, |
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1306 sstats->_time_to_exec_vmop / MICROUNITS); |
| 0 | 1307 |
| 1308 if (need_to_track_page_armed_status) { | |
| 1309 tty->print(INT32_FORMAT" ", sstats->_page_armed); | |
| 1310 } | |
| 1311 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap); | |
| 1312 } | |
| 1313 } | |
| 1314 | |
| 1315 // This method will be called when VM exits. It will first call | |
| 1316 // print_statistics to print out the rest of the sampling. Then | |
| 1317 // it tries to summarize the sampling. | |
| 1318 void SafepointSynchronize::print_stat_on_exit() { | |
| 1319 if (_safepoint_stats == NULL) return; | |
| 1320 | |
| 1321 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index]; | |
| 1322 | |
| 1323 // During VM exit, end_statistics may not get called and in that | |
| 1324 // case, if the sync time is less than PrintSafepointStatisticsTimeout, | |
| 1325 // don't print it out. | |
| 1326 // Approximate the vm op time. | |
| 1327 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop = | |
|
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1328 os::javaTimeNanos() - cleanup_end_time; |
| 0 | 1329 |
| 1330 if ( PrintSafepointStatisticsTimeout < 0 || | |
| 1331 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) { | |
| 1332 print_statistics(); | |
| 1333 } | |
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1334 tty->cr(); |
| 0 | 1335 |
| 1336 // Print out polling page sampling status. | |
| 1337 if (!need_to_track_page_armed_status) { | |
| 1338 if (UseCompilerSafepoints) { | |
| 1339 tty->print_cr("Polling page always armed"); | |
| 1340 } | |
| 1341 } else { | |
| 1342 tty->print_cr("Defer polling page loop count = %d\n", | |
| 1343 DeferPollingPageLoopCount); | |
| 1344 } | |
| 1345 | |
| 1346 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) { | |
| 1347 if (_safepoint_reasons[index] != 0) { | |
| 1348 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index), | |
| 1349 _safepoint_reasons[index]); | |
| 1350 } | |
| 1351 } | |
| 1352 | |
| 1353 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint", | |
| 1354 _coalesced_vmop_count); | |
| 1355 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms", | |
| 1356 _max_sync_time / MICROUNITS); | |
|
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1357 tty->print_cr("Maximum vm operation time (except for Exit VM operation) " |
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1358 INT64_FORMAT_W(5)" ms", |
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1359 _max_vmop_time / MICROUNITS); |
| 0 | 1360 } |
| 1361 | |
| 1362 // ------------------------------------------------------------------------------------------------ | |
| 1363 // Non-product code | |
| 1364 | |
| 1365 #ifndef PRODUCT | |
| 1366 | |
| 1367 void SafepointSynchronize::print_state() { | |
| 1368 if (_state == _not_synchronized) { | |
| 1369 tty->print_cr("not synchronized"); | |
| 1370 } else if (_state == _synchronizing || _state == _synchronized) { | |
| 1371 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" : | |
| 1372 "synchronized"); | |
| 1373 | |
| 1374 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) { | |
| 1375 cur->safepoint_state()->print(); | |
| 1376 } | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 void SafepointSynchronize::safepoint_msg(const char* format, ...) { | |
| 1381 if (ShowSafepointMsgs) { | |
| 1382 va_list ap; | |
| 1383 va_start(ap, format); | |
| 1384 tty->vprint_cr(format, ap); | |
| 1385 va_end(ap); | |
| 1386 } | |
| 1387 } | |
| 1388 | |
| 1389 #endif // !PRODUCT |