hotspot/src/share/vm/runtime/safepoint.cpp
author fparain
Thu, 03 Apr 2014 09:28:28 +0000
changeset 23865 ba4aeedb2a9f
parent 23517 27c4307d6cda
child 24096 6f7e28b293fb
permissions -rw-r--r--
8038473: Remove support for old T1 libthread Reviewed-by: dholmes, coleenp, acorn, dcubed
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/*
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 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "code/codeCache.hpp"
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#include "code/icBuffer.hpp"
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#include "code/nmethod.hpp"
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#include "code/pcDesc.hpp"
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#include "code/scopeDesc.hpp"
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#include "gc_interface/collectedHeap.hpp"
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#include "interpreter/interpreter.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/compilationPolicy.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/signature.hpp"
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#include "runtime/stubCodeGenerator.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/sweeper.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/thread.inline.hpp"
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#include "services/memTracker.hpp"
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#include "services/runtimeService.hpp"
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#include "utilities/events.hpp"
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#include "utilities/macros.hpp"
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#ifdef TARGET_ARCH_x86
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# include "nativeInst_x86.hpp"
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# include "vmreg_x86.inline.hpp"
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#endif
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#ifdef TARGET_ARCH_sparc
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# include "nativeInst_sparc.hpp"
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# include "vmreg_sparc.inline.hpp"
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#endif
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#ifdef TARGET_ARCH_zero
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# include "nativeInst_zero.hpp"
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# include "vmreg_zero.inline.hpp"
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#endif
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#ifdef TARGET_ARCH_arm
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# include "nativeInst_arm.hpp"
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# include "vmreg_arm.inline.hpp"
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#endif
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#ifdef TARGET_ARCH_ppc
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# include "nativeInst_ppc.hpp"
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# include "vmreg_ppc.inline.hpp"
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#endif
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#if INCLUDE_ALL_GCS
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#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
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#include "gc_implementation/shared/concurrentGCThread.hpp"
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#endif // INCLUDE_ALL_GCS
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#ifdef COMPILER1
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#include "c1/c1_globals.hpp"
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#endif
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// --------------------------------------------------------------------------------------------------
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// Implementation of Safepoint begin/end
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SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized;
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volatile int  SafepointSynchronize::_waiting_to_block = 0;
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volatile int SafepointSynchronize::_safepoint_counter = 0;
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int SafepointSynchronize::_current_jni_active_count = 0;
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long  SafepointSynchronize::_end_of_last_safepoint = 0;
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static volatile int PageArmed = 0 ;        // safepoint polling page is RO|RW vs PROT_NONE
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static volatile int TryingToBlock = 0 ;    // proximate value -- for advisory use only
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static bool timeout_error_printed = false;
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// Roll all threads forward to a safepoint and suspend them all
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void SafepointSynchronize::begin() {
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  Thread* myThread = Thread::current();
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  assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint");
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  if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) {
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    _safepoint_begin_time = os::javaTimeNanos();
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    _ts_of_current_safepoint = tty->time_stamp().seconds();
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  }
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#if INCLUDE_ALL_GCS
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  if (UseConcMarkSweepGC) {
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    // In the future we should investigate whether CMS can use the
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    // more-general mechanism below.  DLD (01/05).
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    ConcurrentMarkSweepThread::synchronize(false);
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  } else if (UseG1GC) {
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    ConcurrentGCThread::safepoint_synchronize();
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  }
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#endif // INCLUDE_ALL_GCS
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  // By getting the Threads_lock, we assure that no threads are about to start or
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  // exit. It is released again in SafepointSynchronize::end().
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  Threads_lock->lock();
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  assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state");
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  int nof_threads = Threads::number_of_threads();
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  if (TraceSafepoint) {
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    tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads);
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  }
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  RuntimeService::record_safepoint_begin();
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  MutexLocker mu(Safepoint_lock);
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  // Reset the count of active JNI critical threads
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  _current_jni_active_count = 0;
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  // Set number of threads to wait for, before we initiate the callbacks
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  _waiting_to_block = nof_threads;
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  TryingToBlock     = 0 ;
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  int still_running = nof_threads;
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  // Save the starting time, so that it can be compared to see if this has taken
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  // too long to complete.
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  jlong safepoint_limit_time;
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  timeout_error_printed = false;
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  // PrintSafepointStatisticsTimeout can be specified separately. When
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  // specified, PrintSafepointStatistics will be set to true in
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  // deferred_initialize_stat method. The initialization has to be done
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  // early enough to avoid any races. See bug 6880029 for details.
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  if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) {
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    deferred_initialize_stat();
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  }
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  // Begin the process of bringing the system to a safepoint.
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  // Java threads can be in several different states and are
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  // stopped by different mechanisms:
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  //
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  //  1. Running interpreted
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  //     The interpreter dispatch table is changed to force it to
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  //     check for a safepoint condition between bytecodes.
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  //  2. Running in native code
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  //     When returning from the native code, a Java thread must check
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  //     the safepoint _state to see if we must block.  If the
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  //     VM thread sees a Java thread in native, it does
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  //     not wait for this thread to block.  The order of the memory
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  //     writes and reads of both the safepoint state and the Java
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  //     threads state is critical.  In order to guarantee that the
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  //     memory writes are serialized with respect to each other,
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  //     the VM thread issues a memory barrier instruction
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  //     (on MP systems).  In order to avoid the overhead of issuing
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  //     a memory barrier for each Java thread making native calls, each Java
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  //     thread performs a write to a single memory page after changing
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  //     the thread state.  The VM thread performs a sequence of
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  //     mprotect OS calls which forces all previous writes from all
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  //     Java threads to be serialized.  This is done in the
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  //     os::serialize_thread_states() call.  This has proven to be
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  //     much more efficient than executing a membar instruction
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  //     on every call to native code.
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  //  3. Running compiled Code
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  //     Compiled code reads a global (Safepoint Polling) page that
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  //     is set to fault if we are trying to get to a safepoint.
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  //  4. Blocked
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  //     A thread which is blocked will not be allowed to return from the
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  //     block condition until the safepoint operation is complete.
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  //  5. In VM or Transitioning between states
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  //     If a Java thread is currently running in the VM or transitioning
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  //     between states, the safepointing code will wait for the thread to
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  //     block itself when it attempts transitions to a new state.
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  //
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  _state            = _synchronizing;
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  OrderAccess::fence();
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  // Flush all thread states to memory
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  if (!UseMembar) {
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    os::serialize_thread_states();
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  }
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  // Make interpreter safepoint aware
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  Interpreter::notice_safepoints();
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  if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) {
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    // Make polling safepoint aware
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    guarantee (PageArmed == 0, "invariant") ;
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    PageArmed = 1 ;
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    os::make_polling_page_unreadable();
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  }
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  // Consider using active_processor_count() ... but that call is expensive.
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  int ncpus = os::processor_count() ;
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#ifdef ASSERT
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  for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
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    assert(cur->safepoint_state()->is_running(), "Illegal initial state");
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    // Clear the visited flag to ensure that the critical counts are collected properly.
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    cur->set_visited_for_critical_count(false);
1
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  }
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#endif // ASSERT
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  if (SafepointTimeout)
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    safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS;
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  // Iterate through all threads until it have been determined how to stop them all at a safepoint
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  unsigned int iterations = 0;
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  int steps = 0 ;
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  while(still_running > 0) {
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    for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
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      assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended");
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      ThreadSafepointState *cur_state = cur->safepoint_state();
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      if (cur_state->is_running()) {
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        cur_state->examine_state_of_thread();
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        if (!cur_state->is_running()) {
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           still_running--;
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           // consider adjusting steps downward:
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           //   steps = 0
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           //   steps -= NNN
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           //   steps >>= 1
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           //   steps = MIN(steps, 2000-100)
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           //   if (iterations != 0) steps -= NNN
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        }
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        if (TraceSafepoint && Verbose) cur_state->print();
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      }
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    }
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    if (PrintSafepointStatistics && iterations == 0) {
1
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      begin_statistics(nof_threads, still_running);
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    }
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    if (still_running > 0) {
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      // Check for if it takes to long
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      if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) {
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        print_safepoint_timeout(_spinning_timeout);
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      }
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      // Spin to avoid context switching.
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      // There's a tension between allowing the mutators to run (and rendezvous)
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      // vs spinning.  As the VM thread spins, wasting cycles, it consumes CPU that
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      // a mutator might otherwise use profitably to reach a safepoint.  Excessive
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      // spinning by the VM thread on a saturated system can increase rendezvous latency.
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      // Blocking or yielding incur their own penalties in the form of context switching
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      // and the resultant loss of $ residency.
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      //
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      // Further complicating matters is that yield() does not work as naively expected
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      // on many platforms -- yield() does not guarantee that any other ready threads
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      // will run.   As such we revert yield_all() after some number of iterations.
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      // Yield_all() is implemented as a short unconditional sleep on some platforms.
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      // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping
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      // can actually increase the time it takes the VM thread to detect that a system-wide
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      // stop-the-world safepoint has been reached.  In a pathological scenario such as that
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      // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe.
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      // In that case the mutators will be stalled waiting for the safepoint to complete and the
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      // the VMthread will be sleeping, waiting for the mutators to rendezvous.  The VMthread
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      // will eventually wake up and detect that all mutators are safe, at which point
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      // we'll again make progress.
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      //
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      // Beware too that that the VMThread typically runs at elevated priority.
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      // Its default priority is higher than the default mutator priority.
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      // Obviously, this complicates spinning.
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      //
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      // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0).
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      // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will.
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      //
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      // See the comments in synchronizer.cpp for additional remarks on spinning.
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      //
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      // In the future we might:
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      // 1. Modify the safepoint scheme to avoid potentially unbounded spinning.
1
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      //    This is tricky as the path used by a thread exiting the JVM (say on
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      //    on JNI call-out) simply stores into its state field.  The burden
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      //    is placed on the VM thread, which must poll (spin).
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      // 2. Find something useful to do while spinning.  If the safepoint is GC-related
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      //    we might aggressively scan the stacks of threads that are already safe.
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      // 3. Use Solaris schedctl to examine the state of the still-running mutators.
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      //    If all the mutators are ONPROC there's no reason to sleep or yield.
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      // 4. YieldTo() any still-running mutators that are ready but OFFPROC.
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      // 5. Check system saturation.  If the system is not fully saturated then
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      //    simply spin and avoid sleep/yield.
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      // 6. As still-running mutators rendezvous they could unpark the sleeping
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      //    VMthread.  This works well for still-running mutators that become
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      //    safe.  The VMthread must still poll for mutators that call-out.
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      // 7. Drive the policy on time-since-begin instead of iterations.
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      // 8. Consider making the spin duration a function of the # of CPUs:
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      //    Spin = (((ncpus-1) * M) + K) + F(still_running)
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      //    Alternately, instead of counting iterations of the outer loop
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      //    we could count the # of threads visited in the inner loop, above.
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      // 9. On windows consider using the return value from SwitchThreadTo()
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      //    to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions.
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      if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) {
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         guarantee (PageArmed == 0, "invariant") ;
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         PageArmed = 1 ;
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         os::make_polling_page_unreadable();
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      }
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      // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or
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      // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus)
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      ++steps ;
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      if (ncpus > 1 && steps < SafepointSpinBeforeYield) {
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        SpinPause() ;     // MP-Polite spin
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      } else
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      if (steps < DeferThrSuspendLoopCount) {
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        os::NakedYield() ;
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      } else {
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        os::yield_all() ;
1
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        // Alternately, the VM thread could transiently depress its scheduling priority or
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        // transiently increase the priority of the tardy mutator(s).
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      }
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      iterations ++ ;
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    }
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    assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long");
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  }
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  assert(still_running == 0, "sanity check");
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  if (PrintSafepointStatistics) {
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    update_statistics_on_spin_end();
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  }
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  // wait until all threads are stopped
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  while (_waiting_to_block > 0) {
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    if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block);
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    if (!SafepointTimeout || timeout_error_printed) {
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      Safepoint_lock->wait(true);  // true, means with no safepoint checks
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    } else {
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      // Compute remaining time
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      jlong remaining_time = safepoint_limit_time - os::javaTimeNanos();
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      // If there is no remaining time, then there is an error
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      if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) {
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        print_safepoint_timeout(_blocking_timeout);
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      }
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    }
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  }
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   352
  assert(_waiting_to_block == 0, "sanity check");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   353
489c9b5090e2 Initial load
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parents:
diff changeset
   354
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   355
  if (SafepointTimeout) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   356
    jlong current_time = os::javaTimeNanos();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   357
    if (safepoint_limit_time < current_time) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   358
      tty->print_cr("# SafepointSynchronize: Finished after "
489c9b5090e2 Initial load
duke
parents:
diff changeset
   359
                    INT64_FORMAT_W(6) " ms",
489c9b5090e2 Initial load
duke
parents:
diff changeset
   360
                    ((current_time - safepoint_limit_time) / MICROUNITS +
489c9b5090e2 Initial load
duke
parents:
diff changeset
   361
                     SafepointTimeoutDelay));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   362
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   363
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   364
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   365
489c9b5090e2 Initial load
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parents:
diff changeset
   366
  assert((_safepoint_counter & 0x1) == 0, "must be even");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   367
  assert(Threads_lock->owned_by_self(), "must hold Threads_lock");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   368
  _safepoint_counter ++;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   369
489c9b5090e2 Initial load
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parents:
diff changeset
   370
  // Record state
489c9b5090e2 Initial load
duke
parents:
diff changeset
   371
  _state = _synchronized;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   372
489c9b5090e2 Initial load
duke
parents:
diff changeset
   373
  OrderAccess::fence();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   374
12108
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   375
#ifdef ASSERT
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   376
  for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   377
    // make sure all the threads were visited
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   378
    assert(cur->was_visited_for_critical_count(), "missed a thread");
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   379
  }
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   380
#endif // ASSERT
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   381
11631
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   382
  // Update the count of active JNI critical regions
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   383
  GC_locker::set_jni_lock_count(_current_jni_active_count);
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   384
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   385
  if (TraceSafepoint) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   386
    VM_Operation *op = VMThread::vm_operation();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   387
    tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   388
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   389
489c9b5090e2 Initial load
duke
parents:
diff changeset
   390
  RuntimeService::record_safepoint_synchronized();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   391
  if (PrintSafepointStatistics) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   392
    update_statistics_on_sync_end(os::javaTimeNanos());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   393
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   394
489c9b5090e2 Initial load
duke
parents:
diff changeset
   395
  // Call stuff that needs to be run when a safepoint is just about to be completed
489c9b5090e2 Initial load
duke
parents:
diff changeset
   396
  do_cleanup_tasks();
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   397
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   398
  if (PrintSafepointStatistics) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   399
    // Record how much time spend on the above cleanup tasks
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   400
    update_statistics_on_cleanup_end(os::javaTimeNanos());
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   401
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   402
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   403
489c9b5090e2 Initial load
duke
parents:
diff changeset
   404
// Wake up all threads, so they are ready to resume execution after the safepoint
489c9b5090e2 Initial load
duke
parents:
diff changeset
   405
// operation has been carried out
489c9b5090e2 Initial load
duke
parents:
diff changeset
   406
void SafepointSynchronize::end() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   407
489c9b5090e2 Initial load
duke
parents:
diff changeset
   408
  assert(Threads_lock->owned_by_self(), "must hold Threads_lock");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   409
  assert((_safepoint_counter & 0x1) == 1, "must be odd");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   410
  _safepoint_counter ++;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   411
  // memory fence isn't required here since an odd _safepoint_counter
489c9b5090e2 Initial load
duke
parents:
diff changeset
   412
  // value can do no harm and a fence is issued below anyway.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   413
489c9b5090e2 Initial load
duke
parents:
diff changeset
   414
  DEBUG_ONLY(Thread* myThread = Thread::current();)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   415
  assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   416
489c9b5090e2 Initial load
duke
parents:
diff changeset
   417
  if (PrintSafepointStatistics) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   418
    end_statistics(os::javaTimeNanos());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   419
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   420
489c9b5090e2 Initial load
duke
parents:
diff changeset
   421
#ifdef ASSERT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   422
  // A pending_exception cannot be installed during a safepoint.  The threads
489c9b5090e2 Initial load
duke
parents:
diff changeset
   423
  // may install an async exception after they come back from a safepoint into
489c9b5090e2 Initial load
duke
parents:
diff changeset
   424
  // pending_exception after they unblock.  But that should happen later.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   425
  for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   426
    assert (!(cur->has_pending_exception() &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   427
              cur->safepoint_state()->is_at_poll_safepoint()),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   428
            "safepoint installed a pending exception");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   429
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   430
#endif // ASSERT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   431
489c9b5090e2 Initial load
duke
parents:
diff changeset
   432
  if (PageArmed) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   433
    // Make polling safepoint aware
489c9b5090e2 Initial load
duke
parents:
diff changeset
   434
    os::make_polling_page_readable();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   435
    PageArmed = 0 ;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   436
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   437
489c9b5090e2 Initial load
duke
parents:
diff changeset
   438
  // Remove safepoint check from interpreter
489c9b5090e2 Initial load
duke
parents:
diff changeset
   439
  Interpreter::ignore_safepoints();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   440
489c9b5090e2 Initial load
duke
parents:
diff changeset
   441
  {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   442
    MutexLocker mu(Safepoint_lock);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   443
489c9b5090e2 Initial load
duke
parents:
diff changeset
   444
    assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   445
489c9b5090e2 Initial load
duke
parents:
diff changeset
   446
    // Set to not synchronized, so the threads will not go into the signal_thread_blocked method
489c9b5090e2 Initial load
duke
parents:
diff changeset
   447
    // when they get restarted.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   448
    _state = _not_synchronized;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   449
    OrderAccess::fence();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   450
489c9b5090e2 Initial load
duke
parents:
diff changeset
   451
    if (TraceSafepoint) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   452
       tty->print_cr("Leaving safepoint region");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   453
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   454
489c9b5090e2 Initial load
duke
parents:
diff changeset
   455
    // Start suspended threads
489c9b5090e2 Initial load
duke
parents:
diff changeset
   456
    for(JavaThread *current = Threads::first(); current; current = current->next()) {
2131
98f9cef66a34 6810672: Comment typos
twisti
parents: 1889
diff changeset
   457
      // A problem occurring on Solaris is when attempting to restart threads
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   458
      // the first #cpus - 1 go well, but then the VMThread is preempted when we get
489c9b5090e2 Initial load
duke
parents:
diff changeset
   459
      // to the next one (since it has been running the longest).  We then have
489c9b5090e2 Initial load
duke
parents:
diff changeset
   460
      // to wait for a cpu to become available before we can continue restarting
489c9b5090e2 Initial load
duke
parents:
diff changeset
   461
      // threads.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   462
      // FIXME: This causes the performance of the VM to degrade when active and with
489c9b5090e2 Initial load
duke
parents:
diff changeset
   463
      // large numbers of threads.  Apparently this is due to the synchronous nature
489c9b5090e2 Initial load
duke
parents:
diff changeset
   464
      // of suspending threads.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   465
      //
489c9b5090e2 Initial load
duke
parents:
diff changeset
   466
      // TODO-FIXME: the comments above are vestigial and no longer apply.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   467
      // Furthermore, using solaris' schedctl in this particular context confers no benefit
489c9b5090e2 Initial load
duke
parents:
diff changeset
   468
      if (VMThreadHintNoPreempt) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   469
        os::hint_no_preempt();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   470
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   471
      ThreadSafepointState* cur_state = current->safepoint_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   472
      assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   473
      cur_state->restart();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   474
      assert(cur_state->is_running(), "safepoint state has not been reset");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   475
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   476
489c9b5090e2 Initial load
duke
parents:
diff changeset
   477
    RuntimeService::record_safepoint_end();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   478
489c9b5090e2 Initial load
duke
parents:
diff changeset
   479
    // Release threads lock, so threads can be created/destroyed again. It will also starts all threads
489c9b5090e2 Initial load
duke
parents:
diff changeset
   480
    // blocked in signal_thread_blocked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   481
    Threads_lock->unlock();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   482
489c9b5090e2 Initial load
duke
parents:
diff changeset
   483
  }
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 14583
diff changeset
   484
#if INCLUDE_ALL_GCS
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   485
  // If there are any concurrent GC threads resume them.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   486
  if (UseConcMarkSweepGC) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   487
    ConcurrentMarkSweepThread::desynchronize(false);
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 2154
diff changeset
   488
  } else if (UseG1GC) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   489
    ConcurrentGCThread::safepoint_desynchronize();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   490
  }
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 14583
diff changeset
   491
#endif // INCLUDE_ALL_GCS
22551
9bf46d16dcc6 8025856: Fix typos in the GC code
jwilhelm
parents: 20300
diff changeset
   492
  // record this time so VMThread can keep track how much time has elapsed
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   493
  // since last safepoint.
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   494
  _end_of_last_safepoint = os::javaTimeMillis();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   495
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
bool SafepointSynchronize::is_cleanup_needed() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   498
  // Need a safepoint if some inline cache buffers is non-empty
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
  if (!InlineCacheBuffer::is_empty()) return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   500
  return false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   501
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
489c9b5090e2 Initial load
duke
parents:
diff changeset
   503
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
489c9b5090e2 Initial load
duke
parents:
diff changeset
   505
// Various cleaning tasks that should be done periodically at safepoints
489c9b5090e2 Initial load
duke
parents:
diff changeset
   506
void SafepointSynchronize::do_cleanup_tasks() {
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   507
  {
5086
ebccc0bb7b8e 6934758: Expose the break down of clean up task time during safepoint.
xlu
parents: 5042
diff changeset
   508
    TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime);
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   509
    ObjectSynchronizer::deflate_idle_monitors();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   510
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   512
  {
5086
ebccc0bb7b8e 6934758: Expose the break down of clean up task time during safepoint.
xlu
parents: 5042
diff changeset
   513
    TraceTime t2("updating inline caches", TraceSafepointCleanupTime);
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   514
    InlineCacheBuffer::update_inline_caches();
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   515
  }
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents: 6269
diff changeset
   516
  {
970dc585ab63 6953144: Tiered compilation
iveresov
parents: 6269
diff changeset
   517
    TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime);
970dc585ab63 6953144: Tiered compilation
iveresov
parents: 6269
diff changeset
   518
    CompilationPolicy::policy()->do_safepoint_work();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
  }
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
   520
13087
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   521
  {
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 16670
diff changeset
   522
    TraceTime t4("mark nmethods", TraceSafepointCleanupTime);
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 16670
diff changeset
   523
    NMethodSweeper::mark_active_nmethods();
13087
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   524
  }
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   525
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   526
  if (SymbolTable::needs_rehashing()) {
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   527
    TraceTime t5("rehashing symbol table", TraceSafepointCleanupTime);
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   528
    SymbolTable::rehash_table();
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   529
  }
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   530
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   531
  if (StringTable::needs_rehashing()) {
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   532
    TraceTime t6("rehashing string table", TraceSafepointCleanupTime);
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   533
    StringTable::rehash_table();
673ea6efaf18 7158800: Improve storage of symbol tables
coleenp
parents: 12108
diff changeset
   534
  }
9990
c8683968c01b 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 8921
diff changeset
   535
c8683968c01b 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 8921
diff changeset
   536
  // rotate log files?
c8683968c01b 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 8921
diff changeset
   537
  if (UseGCLogFileRotation) {
23517
27c4307d6cda 7090324: gclog rotation via external tool
minqi
parents: 22551
diff changeset
   538
    gclog_or_tty->rotate_log(false);
9990
c8683968c01b 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 8921
diff changeset
   539
  }
13195
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 13087
diff changeset
   540
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 13087
diff changeset
   541
  if (MemTracker::is_on()) {
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 13087
diff changeset
   542
    MemTracker::sync();
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 13087
diff changeset
   543
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   544
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   545
489c9b5090e2 Initial load
duke
parents:
diff changeset
   546
489c9b5090e2 Initial load
duke
parents:
diff changeset
   547
bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   548
  switch(state) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   549
  case _thread_in_native:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   550
    // native threads are safe if they have no java stack or have walkable stack
489c9b5090e2 Initial load
duke
parents:
diff changeset
   551
    return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   552
489c9b5090e2 Initial load
duke
parents:
diff changeset
   553
   // blocked threads should have already have walkable stack
489c9b5090e2 Initial load
duke
parents:
diff changeset
   554
  case _thread_blocked:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   555
    assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   556
    return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   557
489c9b5090e2 Initial load
duke
parents:
diff changeset
   558
  default:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   559
    return false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   560
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   561
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   562
489c9b5090e2 Initial load
duke
parents:
diff changeset
   563
11637
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   564
// See if the thread is running inside a lazy critical native and
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   565
// update the thread critical count if so.  Also set a suspend flag to
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   566
// cause the native wrapper to return into the JVM to do the unlock
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   567
// once the native finishes.
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   568
void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) {
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   569
  if (state == _thread_in_native &&
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   570
      thread->has_last_Java_frame() &&
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   571
      thread->frame_anchor()->walkable()) {
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   572
    // This thread might be in a critical native nmethod so look at
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   573
    // the top of the stack and increment the critical count if it
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   574
    // is.
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   575
    frame wrapper_frame = thread->last_frame();
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   576
    CodeBlob* stub_cb = wrapper_frame.cb();
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   577
    if (stub_cb != NULL &&
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   578
        stub_cb->is_nmethod() &&
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   579
        stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) {
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   580
      // A thread could potentially be in a critical native across
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   581
      // more than one safepoint, so only update the critical state on
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   582
      // the first one.  When it returns it will perform the unlock.
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   583
      if (!thread->do_critical_native_unlock()) {
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   584
#ifdef ASSERT
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   585
        if (!thread->in_critical()) {
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   586
          GC_locker::increment_debug_jni_lock_count();
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   587
        }
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   588
#endif
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   589
        thread->enter_critical();
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   590
        // Make sure the native wrapper calls back on return to
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   591
        // perform the needed critical unlock.
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   592
        thread->set_critical_native_unlock();
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   593
      }
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   594
    }
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   595
  }
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   596
}
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   597
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   598
030466036615 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 11631
diff changeset
   599
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   600
// -------------------------------------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   601
// Implementation of Safepoint callback point
489c9b5090e2 Initial load
duke
parents:
diff changeset
   602
489c9b5090e2 Initial load
duke
parents:
diff changeset
   603
void SafepointSynchronize::block(JavaThread *thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   604
  assert(thread != NULL, "thread must be set");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   605
  assert(thread->is_Java_thread(), "not a Java thread");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   606
489c9b5090e2 Initial load
duke
parents:
diff changeset
   607
  // Threads shouldn't block if they are in the middle of printing, but...
489c9b5090e2 Initial load
duke
parents:
diff changeset
   608
  ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   609
489c9b5090e2 Initial load
duke
parents:
diff changeset
   610
  // Only bail from the block() call if the thread is gone from the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   611
  // thread list; starting to exit should still block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   612
  if (thread->is_terminated()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   613
     // block current thread if we come here from native code when VM is gone
489c9b5090e2 Initial load
duke
parents:
diff changeset
   614
     thread->block_if_vm_exited();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   615
489c9b5090e2 Initial load
duke
parents:
diff changeset
   616
     // otherwise do nothing
489c9b5090e2 Initial load
duke
parents:
diff changeset
   617
     return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   618
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   619
489c9b5090e2 Initial load
duke
parents:
diff changeset
   620
  JavaThreadState state = thread->thread_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   621
  thread->frame_anchor()->make_walkable(thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   622
489c9b5090e2 Initial load
duke
parents:
diff changeset
   623
  // Check that we have a valid thread_state at this point
489c9b5090e2 Initial load
duke
parents:
diff changeset
   624
  switch(state) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   625
    case _thread_in_vm_trans:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   626
    case _thread_in_Java:        // From compiled code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   627
489c9b5090e2 Initial load
duke
parents:
diff changeset
   628
      // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   629
      // we pretend we are still in the VM.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   630
      thread->set_thread_state(_thread_in_vm);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   631
489c9b5090e2 Initial load
duke
parents:
diff changeset
   632
      if (is_synchronizing()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   633
         Atomic::inc (&TryingToBlock) ;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   634
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   635
489c9b5090e2 Initial load
duke
parents:
diff changeset
   636
      // We will always be holding the Safepoint_lock when we are examine the state
489c9b5090e2 Initial load
duke
parents:
diff changeset
   637
      // of a thread. Hence, the instructions between the Safepoint_lock->lock() and
489c9b5090e2 Initial load
duke
parents:
diff changeset
   638
      // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   639
      Safepoint_lock->lock_without_safepoint_check();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   640
      if (is_synchronizing()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   641
        // Decrement the number of threads to wait for and signal vm thread
489c9b5090e2 Initial load
duke
parents:
diff changeset
   642
        assert(_waiting_to_block > 0, "sanity check");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   643
        _waiting_to_block--;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   644
        thread->safepoint_state()->set_has_called_back(true);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   645
12108
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   646
        DEBUG_ONLY(thread->set_visited_for_critical_count(true));
11631
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   647
        if (thread->in_critical()) {
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   648
          // Notice that this thread is in a critical section
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   649
          increment_jni_active_count();
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   650
        }
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   651
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   652
        // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread
489c9b5090e2 Initial load
duke
parents:
diff changeset
   653
        if (_waiting_to_block == 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   654
          Safepoint_lock->notify_all();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   655
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   656
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   657
489c9b5090e2 Initial load
duke
parents:
diff changeset
   658
      // We transition the thread to state _thread_blocked here, but
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
      // we can't do our usual check for external suspension and then
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
      // self-suspend after the lock_without_safepoint_check() call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   661
      // below because we are often called during transitions while
489c9b5090e2 Initial load
duke
parents:
diff changeset
   662
      // we hold different locks. That would leave us suspended while
489c9b5090e2 Initial load
duke
parents:
diff changeset
   663
      // holding a resource which results in deadlocks.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
      thread->set_thread_state(_thread_blocked);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   665
      Safepoint_lock->unlock();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   666
489c9b5090e2 Initial load
duke
parents:
diff changeset
   667
      // We now try to acquire the threads lock. Since this lock is hold by the VM thread during
489c9b5090e2 Initial load
duke
parents:
diff changeset
   668
      // the entire safepoint, the threads will all line up here during the safepoint.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   669
      Threads_lock->lock_without_safepoint_check();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   670
      // restore original state. This is important if the thread comes from compiled code, so it
489c9b5090e2 Initial load
duke
parents:
diff changeset
   671
      // will continue to execute with the _thread_in_Java state.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   672
      thread->set_thread_state(state);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   673
      Threads_lock->unlock();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   674
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   675
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
    case _thread_in_native_trans:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   677
    case _thread_blocked_trans:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   678
    case _thread_new_trans:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   679
      if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
        thread->print_thread_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   681
        fatal("Deadlock in safepoint code.  "
489c9b5090e2 Initial load
duke
parents:
diff changeset
   682
              "Should have called back to the VM before blocking.");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   683
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   684
489c9b5090e2 Initial load
duke
parents:
diff changeset
   685
      // We transition the thread to state _thread_blocked here, but
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
      // we can't do our usual check for external suspension and then
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
      // self-suspend after the lock_without_safepoint_check() call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   688
      // below because we are often called during transitions while
489c9b5090e2 Initial load
duke
parents:
diff changeset
   689
      // we hold different locks. That would leave us suspended while
489c9b5090e2 Initial load
duke
parents:
diff changeset
   690
      // holding a resource which results in deadlocks.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   691
      thread->set_thread_state(_thread_blocked);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   692
489c9b5090e2 Initial load
duke
parents:
diff changeset
   693
      // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   694
      // the safepoint code might still be waiting for it to block. We need to change the state here,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
      // so it can see that it is at a safepoint.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   696
489c9b5090e2 Initial load
duke
parents:
diff changeset
   697
      // Block until the safepoint operation is completed.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   698
      Threads_lock->lock_without_safepoint_check();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   699
489c9b5090e2 Initial load
duke
parents:
diff changeset
   700
      // Restore state
489c9b5090e2 Initial load
duke
parents:
diff changeset
   701
      thread->set_thread_state(state);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   702
489c9b5090e2 Initial load
duke
parents:
diff changeset
   703
      Threads_lock->unlock();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   704
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   705
489c9b5090e2 Initial load
duke
parents:
diff changeset
   706
    default:
5403
6b0dd9c75dde 6888954: argument formatting for assert() and friends
jcoomes
parents: 5086
diff changeset
   707
     fatal(err_msg("Illegal threadstate encountered: %d", state));
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   708
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   709
489c9b5090e2 Initial load
duke
parents:
diff changeset
   710
  // Check for pending. async. exceptions or suspends - except if the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   711
  // thread was blocked inside the VM. has_special_runtime_exit_condition()
489c9b5090e2 Initial load
duke
parents:
diff changeset
   712
  // is called last since it grabs a lock and we only want to do that when
489c9b5090e2 Initial load
duke
parents:
diff changeset
   713
  // we must.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   714
  //
489c9b5090e2 Initial load
duke
parents:
diff changeset
   715
  // Note: we never deliver an async exception at a polling point as the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   716
  // compiler may not have an exception handler for it. The polling
489c9b5090e2 Initial load
duke
parents:
diff changeset
   717
  // code will notice the async and deoptimize and the exception will
489c9b5090e2 Initial load
duke
parents:
diff changeset
   718
  // be delivered. (Polling at a return point is ok though). Sure is
489c9b5090e2 Initial load
duke
parents:
diff changeset
   719
  // a lot of bother for a deprecated feature...
489c9b5090e2 Initial load
duke
parents:
diff changeset
   720
  //
489c9b5090e2 Initial load
duke
parents:
diff changeset
   721
  // We don't deliver an async exception if the thread state is
489c9b5090e2 Initial load
duke
parents:
diff changeset
   722
  // _thread_in_native_trans so JNI functions won't be called with
489c9b5090e2 Initial load
duke
parents:
diff changeset
   723
  // a surprising pending exception. If the thread state is going back to java,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   724
  // async exception is checked in check_special_condition_for_native_trans().
489c9b5090e2 Initial load
duke
parents:
diff changeset
   725
489c9b5090e2 Initial load
duke
parents:
diff changeset
   726
  if (state != _thread_blocked_trans &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   727
      state != _thread_in_vm_trans &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   728
      thread->has_special_runtime_exit_condition()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   729
    thread->handle_special_runtime_exit_condition(
489c9b5090e2 Initial load
duke
parents:
diff changeset
   730
      !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   731
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   732
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   733
489c9b5090e2 Initial load
duke
parents:
diff changeset
   734
// ------------------------------------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   735
// Exception handlers
489c9b5090e2 Initial load
duke
parents:
diff changeset
   736
489c9b5090e2 Initial load
duke
parents:
diff changeset
   737
#ifndef PRODUCT
16670
4af09aff4237 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 15482
diff changeset
   738
4af09aff4237 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 15482
diff changeset
   739
#ifdef SPARC
4af09aff4237 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 15482
diff changeset
   740
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   741
#ifdef _LP64
489c9b5090e2 Initial load
duke
parents:
diff changeset
   742
#define PTR_PAD ""
489c9b5090e2 Initial load
duke
parents:
diff changeset
   743
#else
489c9b5090e2 Initial load
duke
parents:
diff changeset
   744
#define PTR_PAD "        "
489c9b5090e2 Initial load
duke
parents:
diff changeset
   745
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   746
489c9b5090e2 Initial load
duke
parents:
diff changeset
   747
static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) {
20282
7f9cbdf89af2 7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents: 16670
diff changeset
   748
  bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   749
  tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s",
489c9b5090e2 Initial load
duke
parents:
diff changeset
   750
                oldptr, wasoop?"oop":"   ", oldptr == newptr ? ' ' : '!',
489c9b5090e2 Initial load
duke
parents:
diff changeset
   751
                newptr, is_oop?"oop":"   ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":"     "));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   752
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   753
489c9b5090e2 Initial load
duke
parents:
diff changeset
   754
static void print_longs(jlong oldptr, jlong newptr, bool wasoop) {
20282
7f9cbdf89af2 7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents: 16670
diff changeset
   755
  bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   756
  tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s",
489c9b5090e2 Initial load
duke
parents:
diff changeset
   757
                oldptr, wasoop?"oop":"   ", oldptr == newptr ? ' ' : '!',
489c9b5090e2 Initial load
duke
parents:
diff changeset
   758
                newptr, is_oop?"oop":"   ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":"     "));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   759
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   760
489c9b5090e2 Initial load
duke
parents:
diff changeset
   761
static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   762
#ifdef _LP64
489c9b5090e2 Initial load
duke
parents:
diff changeset
   763
  tty->print_cr("--------+------address-----+------before-----------+-------after----------+");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   764
  const int incr = 1;           // Increment to skip a long, in units of intptr_t
489c9b5090e2 Initial load
duke
parents:
diff changeset
   765
#else
489c9b5090e2 Initial load
duke
parents:
diff changeset
   766
  tty->print_cr("--------+--address-+------before-----------+-------after----------+");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   767
  const int incr = 2;           // Increment to skip a long, in units of intptr_t
489c9b5090e2 Initial load
duke
parents:
diff changeset
   768
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   769
  tty->print_cr("---SP---|");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   770
  for( int i=0; i<16; i++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   771
    tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   772
  tty->print_cr("--------|");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   773
  for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   774
    tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   775
  tty->print("     pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   776
  tty->print_cr("--------|");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   777
  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;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   778
  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;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   779
  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;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   780
  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;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   781
  tty->print_cr(" FSR    |"PTR_FORMAT" "PTR64_FORMAT"       "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   782
  old_sp += incr; new_sp += incr; was_oops += incr;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   783
  // Skip the floats
489c9b5090e2 Initial load
duke
parents:
diff changeset
   784
  tty->print_cr("--Float-|"PTR_FORMAT,new_sp);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   785
  tty->print_cr("---FP---|");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   786
  old_sp += incr*32;  new_sp += incr*32;  was_oops += incr*32;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   787
  for( int i2=0; i2<16; i2++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   788
    tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   789
  tty->print_cr("");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   790
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   791
#endif  // SPARC
489c9b5090e2 Initial load
duke
parents:
diff changeset
   792
#endif  // PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   793
489c9b5090e2 Initial load
duke
parents:
diff changeset
   794
489c9b5090e2 Initial load
duke
parents:
diff changeset
   795
void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   796
  assert(thread->is_Java_thread(), "polling reference encountered by VM thread");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   797
  assert(thread->thread_state() == _thread_in_Java, "should come from Java code");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   798
  assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   799
489c9b5090e2 Initial load
duke
parents:
diff changeset
   800
  // Uncomment this to get some serious before/after printing of the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   801
  // Sparc safepoint-blob frame structure.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   802
  /*
489c9b5090e2 Initial load
duke
parents:
diff changeset
   803
  intptr_t* sp = thread->last_Java_sp();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   804
  intptr_t stack_copy[150];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   805
  for( int i=0; i<150; i++ ) stack_copy[i] = sp[i];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   806
  bool was_oops[150];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   807
  for( int i=0; i<150; i++ )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   808
    was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   809
  */
489c9b5090e2 Initial load
duke
parents:
diff changeset
   810
489c9b5090e2 Initial load
duke
parents:
diff changeset
   811
  if (ShowSafepointMsgs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   812
    tty->print("handle_polling_page_exception: ");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   813
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   814
489c9b5090e2 Initial load
duke
parents:
diff changeset
   815
  if (PrintSafepointStatistics) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   816
    inc_page_trap_count();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   817
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   818
489c9b5090e2 Initial load
duke
parents:
diff changeset
   819
  ThreadSafepointState* state = thread->safepoint_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   820
489c9b5090e2 Initial load
duke
parents:
diff changeset
   821
  state->handle_polling_page_exception();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   822
  // print_me(sp,stack_copy,was_oops);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   823
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   824
489c9b5090e2 Initial load
duke
parents:
diff changeset
   825
489c9b5090e2 Initial load
duke
parents:
diff changeset
   826
void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   827
  if (!timeout_error_printed) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   828
    timeout_error_printed = true;
22551
9bf46d16dcc6 8025856: Fix typos in the GC code
jwilhelm
parents: 20300
diff changeset
   829
    // Print out the thread info which didn't reach the safepoint for debugging
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   830
    // purposes (useful when there are lots of threads in the debugger).
489c9b5090e2 Initial load
duke
parents:
diff changeset
   831
    tty->print_cr("");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   832
    tty->print_cr("# SafepointSynchronize::begin: Timeout detected:");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   833
    if (reason ==  _spinning_timeout) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   834
      tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint.");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   835
    } else if (reason == _blocking_timeout) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   836
      tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop.");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   837
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   838
489c9b5090e2 Initial load
duke
parents:
diff changeset
   839
    tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   840
    ThreadSafepointState *cur_state;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   841
    ResourceMark rm;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   842
    for(JavaThread *cur_thread = Threads::first(); cur_thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   843
        cur_thread = cur_thread->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   844
      cur_state = cur_thread->safepoint_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   845
489c9b5090e2 Initial load
duke
parents:
diff changeset
   846
      if (cur_thread->thread_state() != _thread_blocked &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   847
          ((reason == _spinning_timeout && cur_state->is_running()) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   848
           (reason == _blocking_timeout && !cur_state->has_called_back()))) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   849
        tty->print("# ");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   850
        cur_thread->print();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   851
        tty->print_cr("");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   852
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   853
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   854
    tty->print_cr("# SafepointSynchronize::begin: (End of list)");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   855
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   856
489c9b5090e2 Initial load
duke
parents:
diff changeset
   857
  // To debug the long safepoint, specify both DieOnSafepointTimeout &
489c9b5090e2 Initial load
duke
parents:
diff changeset
   858
  // ShowMessageBoxOnError.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   859
  if (DieOnSafepointTimeout) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   860
    char msg[1024];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   861
    VM_Operation *op = VMThread::vm_operation();
1889
24b003a6fe46 6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents: 1
diff changeset
   862
    sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.",
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   863
            SafepointTimeoutDelay,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   864
            op != NULL ? op->name() : "no vm operation");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   865
    fatal(msg);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   866
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   867
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   868
489c9b5090e2 Initial load
duke
parents:
diff changeset
   869
489c9b5090e2 Initial load
duke
parents:
diff changeset
   870
// -------------------------------------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   871
// Implementation of ThreadSafepointState
489c9b5090e2 Initial load
duke
parents:
diff changeset
   872
489c9b5090e2 Initial load
duke
parents:
diff changeset
   873
ThreadSafepointState::ThreadSafepointState(JavaThread *thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   874
  _thread = thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   875
  _type   = _running;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   876
  _has_called_back = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   877
  _at_poll_safepoint = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   878
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   879
489c9b5090e2 Initial load
duke
parents:
diff changeset
   880
void ThreadSafepointState::create(JavaThread *thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   881
  ThreadSafepointState *state = new ThreadSafepointState(thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   882
  thread->set_safepoint_state(state);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   883
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   884
489c9b5090e2 Initial load
duke
parents:
diff changeset
   885
void ThreadSafepointState::destroy(JavaThread *thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   886
  if (thread->safepoint_state()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   887
    delete(thread->safepoint_state());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   888
    thread->set_safepoint_state(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   889
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   890
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   891
489c9b5090e2 Initial load
duke
parents:
diff changeset
   892
void ThreadSafepointState::examine_state_of_thread() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   893
  assert(is_running(), "better be running or just have hit safepoint poll");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   894
489c9b5090e2 Initial load
duke
parents:
diff changeset
   895
  JavaThreadState state = _thread->thread_state();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   896
6269
10e06287c0b0 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 5547
diff changeset
   897
  // Save the state at the start of safepoint processing.
10e06287c0b0 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 5547
diff changeset
   898
  _orig_thread_state = state;
10e06287c0b0 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 5547
diff changeset
   899
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   900
  // Check for a thread that is suspended. Note that thread resume tries
489c9b5090e2 Initial load
duke
parents:
diff changeset
   901
  // to grab the Threads_lock which we own here, so a thread cannot be
489c9b5090e2 Initial load
duke
parents:
diff changeset
   902
  // resumed during safepoint synchronization.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   903
3826
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   904
  // We check to see if this thread is suspended without locking to
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   905
  // avoid deadlocking with a third thread that is waiting for this
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   906
  // thread to be suspended. The third thread can notice the safepoint
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   907
  // that we're trying to start at the beginning of its SR_lock->wait()
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   908
  // call. If that happens, then the third thread will block on the
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   909
  // safepoint while still holding the underlying SR_lock. We won't be
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   910
  // able to get the SR_lock and we'll deadlock.
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   911
  //
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   912
  // We don't need to grab the SR_lock here for two reasons:
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   913
  // 1) The suspend flags are both volatile and are set with an
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   914
  //    Atomic::cmpxchg() call so we should see the suspended
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   915
  //    state right away.
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   916
  // 2) We're being called from the safepoint polling loop; if
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   917
  //    we don't see the suspended state on this iteration, then
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   918
  //    we'll come around again.
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   919
  //
67b89f5a5cac 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 3262
diff changeset
   920
  bool is_suspended = _thread->is_ext_suspended();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   921
  if (is_suspended) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   922
    roll_forward(_at_safepoint);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   923
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   924
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   925
489c9b5090e2 Initial load
duke
parents:
diff changeset
   926
  // Some JavaThread states have an initial safepoint state of
489c9b5090e2 Initial load
duke
parents:
diff changeset
   927
  // running, but are actually at a safepoint. We will happily
489c9b5090e2 Initial load
duke
parents:
diff changeset
   928
  // agree and update the safepoint state here.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   929
  if (SafepointSynchronize::safepoint_safe(_thread, state)) {
12108
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   930
    SafepointSynchronize::check_for_lazy_critical_native(_thread, state);
11631
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   931
    roll_forward(_at_safepoint);
33813f69207b 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 10565
diff changeset
   932
    return;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   933
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   934
489c9b5090e2 Initial load
duke
parents:
diff changeset
   935
  if (state == _thread_in_vm) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   936
    roll_forward(_call_back);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   937
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   938
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   939
489c9b5090e2 Initial load
duke
parents:
diff changeset
   940
  // All other thread states will continue to run until they
489c9b5090e2 Initial load
duke
parents:
diff changeset
   941
  // transition and self-block in state _blocked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   942
  // Safepoint polling in compiled code causes the Java threads to do the same.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   943
  // Note: new threads may require a malloc so they must be allowed to finish
489c9b5090e2 Initial load
duke
parents:
diff changeset
   944
489c9b5090e2 Initial load
duke
parents:
diff changeset
   945
  assert(is_running(), "examine_state_of_thread on non-running thread");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   946
  return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   947
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   948
489c9b5090e2 Initial load
duke
parents:
diff changeset
   949
// Returns true is thread could not be rolled forward at present position.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   950
void ThreadSafepointState::roll_forward(suspend_type type) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   951
  _type = type;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   952
489c9b5090e2 Initial load
duke
parents:
diff changeset
   953
  switch(_type) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   954
    case _at_safepoint:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   955
      SafepointSynchronize::signal_thread_at_safepoint();
12108
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   956
      DEBUG_ONLY(_thread->set_visited_for_critical_count(true));
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   957
      if (_thread->in_critical()) {
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   958
        // Notice that this thread is in a critical section
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   959
        SafepointSynchronize::increment_jni_active_count();
b2ee55606008 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 11637
diff changeset
   960
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   961
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   962
489c9b5090e2 Initial load
duke
parents:
diff changeset
   963
    case _call_back:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   964
      set_has_called_back(false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   965
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   966
489c9b5090e2 Initial load
duke
parents:
diff changeset
   967
    case _running:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   968
    default:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   969
      ShouldNotReachHere();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   970
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   971
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   972
489c9b5090e2 Initial load
duke
parents:
diff changeset
   973
void ThreadSafepointState::restart() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   974
  switch(type()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   975
    case _at_safepoint:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   976
    case _call_back:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   977
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   978
489c9b5090e2 Initial load
duke
parents:
diff changeset
   979
    case _running:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   980
    default:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   981
       tty->print_cr("restart thread "INTPTR_FORMAT" with state %d",
489c9b5090e2 Initial load
duke
parents:
diff changeset
   982
                      _thread, _type);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   983
       _thread->print();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   984
      ShouldNotReachHere();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   985
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   986
  _type = _running;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   987
  set_has_called_back(false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   988
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   989
489c9b5090e2 Initial load
duke
parents:
diff changeset
   990
489c9b5090e2 Initial load
duke
parents:
diff changeset
   991
void ThreadSafepointState::print_on(outputStream *st) const {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   992
  const char *s;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   993
489c9b5090e2 Initial load
duke
parents:
diff changeset
   994
  switch(_type) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   995
    case _running                : s = "_running";              break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   996
    case _at_safepoint           : s = "_at_safepoint";         break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   997
    case _call_back              : s = "_call_back";            break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   998
    default:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   999
      ShouldNotReachHere();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1000
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1001
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1002
  st->print_cr("Thread: " INTPTR_FORMAT
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1003
              "  [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d",
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1004
               _thread, _thread->osthread()->thread_id(), s, _has_called_back,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1005
               _at_poll_safepoint);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1006
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1007
  _thread->print_thread_state_on(st);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1008
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1009
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1010
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1011
// ---------------------------------------------------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1012
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1013
// Block the thread at the safepoint poll or poll return.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1014
void ThreadSafepointState::handle_polling_page_exception() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1015
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1016
  // Check state.  block() will set thread state to thread_in_vm which will
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1017
  // cause the safepoint state _type to become _call_back.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1018
  assert(type() == ThreadSafepointState::_running,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1019
         "polling page exception on thread not running state");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1020
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1021
  // Step 1: Find the nmethod from the return address
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1022
  if (ShowSafepointMsgs && Verbose) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1023
    tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc());
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1024
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1025
  address real_return_addr = thread()->saved_exception_pc();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1026
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1027
  CodeBlob *cb = CodeCache::find_blob(real_return_addr);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1028
  assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1029
  nmethod* nm = (nmethod*)cb;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1030
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1031
  // Find frame of caller
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1032
  frame stub_fr = thread()->last_frame();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1033
  CodeBlob* stub_cb = stub_fr.cb();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1034
  assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1035
  RegisterMap map(thread(), true);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1036
  frame caller_fr = stub_fr.sender(&map);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1037
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1038
  // Should only be poll_return or poll
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1039
  assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" );
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1040
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1041
  // This is a poll immediately before a return. The exception handling code
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1042
  // has already had the effect of causing the return to occur, so the execution
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1043
  // will continue immediately after the call. In addition, the oopmap at the
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1044
  // return point does not mark the return value as an oop (if it is), so
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1045
  // it needs a handle here to be updated.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1046
  if( nm->is_at_poll_return(real_return_addr) ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1047
    // See if return type is an oop.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1048
    bool return_oop = nm->method()->is_returning_oop();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1049
    Handle return_value;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1050
    if (return_oop) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1051
      // The oop result has been saved on the stack together with all
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1052
      // the other registers. In order to preserve it over GCs we need
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1053
      // to keep it in a handle.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1054
      oop result = caller_fr.saved_oop_result(&map);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1055
      assert(result == NULL || result->is_oop(), "must be oop");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1056
      return_value = Handle(thread(), result);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1057
      assert(Universe::heap()->is_in_or_null(result), "must be heap pointer");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1058
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1059
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1060
    // Block the thread
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1061
    SafepointSynchronize::block(thread());
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1062
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1063
    // restore oop result, if any
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1064
    if (return_oop) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1065
      caller_fr.set_saved_oop_result(&map, return_value());
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1066
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1067
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1068
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1069
  // This is a safepoint poll. Verify the return address and block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1070
  else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1071
    set_at_poll_safepoint(true);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1072
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1073
    // verify the blob built the "return address" correctly
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1074
    assert(real_return_addr == caller_fr.pc(), "must match");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1075
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1076
    // Block the thread
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1077
    SafepointSynchronize::block(thread());
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1078
    set_at_poll_safepoint(false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1079
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1080
    // If we have a pending async exception deoptimize the frame
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1081
    // as otherwise we may never deliver it.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1082
    if (thread()->has_async_condition()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1083
      ThreadInVMfromJavaNoAsyncException __tiv(thread());
7106
867c9d296c6b 6968367: can_post_on_exceptions is still using VM_DeoptimizeFrame in some places
never
parents: 6453
diff changeset
  1084
      Deoptimization::deoptimize_frame(thread(), caller_fr.id());
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1085
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1086
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1087
    // If an exception has been installed we must check for a pending deoptimization
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1088
    // Deoptimize frame if exception has been thrown.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1089
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1090
    if (thread()->has_pending_exception() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1091
      RegisterMap map(thread(), true);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1092
      frame caller_fr = stub_fr.sender(&map);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1093
      if (caller_fr.is_deoptimized_frame()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1094
        // The exception patch will destroy registers that are still
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1095
        // live and will be needed during deoptimization. Defer the
22551
9bf46d16dcc6 8025856: Fix typos in the GC code
jwilhelm
parents: 20300
diff changeset
  1096
        // Async exception should have deferred the exception until the
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1097
        // next safepoint which will be detected when we get into
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1098
        // the interpreter so if we have an exception now things
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1099
        // are messed up.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1100
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1101
        fatal("Exception installed and deoptimization is pending");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1102
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1103
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1104
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1105
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1106
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1107
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1108
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1109
//                     Statistics & Instrumentations
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1110
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1111
SafepointSynchronize::SafepointStats*  SafepointSynchronize::_safepoint_stats = NULL;
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1112
jlong  SafepointSynchronize::_safepoint_begin_time = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1113
int    SafepointSynchronize::_cur_stat_index = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1114
julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1115
julong SafepointSynchronize::_coalesced_vmop_count = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1116
jlong  SafepointSynchronize::_max_sync_time = 0;
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1117
jlong  SafepointSynchronize::_max_vmop_time = 0;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1118
float  SafepointSynchronize::_ts_of_current_safepoint = 0.0f;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1119
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1120
static jlong  cleanup_end_time = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1121
static bool   need_to_track_page_armed_status = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1122
static bool   init_done = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1123
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1124
// Helper method to print the header.
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1125
static void print_header() {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1126
  tty->print("         vmop                    "
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1127
             "[threads: total initially_running wait_to_block]    ");
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1128
  tty->print("[time: spin block sync cleanup vmop] ");
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1129
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1130
  // no page armed status printed out if it is always armed.
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1131
  if (need_to_track_page_armed_status) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1132
    tty->print("page_armed ");
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1133
  }
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1134
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1135
  tty->print_cr("page_trap_count");
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1136
}
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1137
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1138
void SafepointSynchronize::deferred_initialize_stat() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1139
  if (init_done) return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1140
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1141
  if (PrintSafepointStatisticsCount <= 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1142
    fatal("Wrong PrintSafepointStatisticsCount");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1143
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1144
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1145
  // If PrintSafepointStatisticsTimeout is specified, the statistics data will
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1146
  // be printed right away, in which case, _safepoint_stats will regress to
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1147
  // a single element array. Otherwise, it is a circular ring buffer with default
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1148
  // size of PrintSafepointStatisticsCount.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1149
  int stats_array_size;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1150
  if (PrintSafepointStatisticsTimeout > 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1151
    stats_array_size = 1;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1152
    PrintSafepointStatistics = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1153
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1154
    stats_array_size = PrintSafepointStatisticsCount;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1155
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1156
  _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size
13195
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 13087
diff changeset
  1157
                                                 * sizeof(SafepointStats), mtInternal);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1158
  guarantee(_safepoint_stats != NULL,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1159
            "not enough memory for safepoint instrumentation data");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1160
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1161
  if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1162
    need_to_track_page_armed_status = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1163
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1164
  init_done = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1165
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1166
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1167
void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) {
4006
7be2d5b3b15c 6880029: JDK 1.6.0_u14p Application crashed very early
xlu
parents: 3826
diff changeset
  1168
  assert(init_done, "safepoint statistics array hasn't been initialized");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1169
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1170
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1171
  spstat->_time_stamp = _ts_of_current_safepoint;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1172
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1173
  VM_Operation *op = VMThread::vm_operation();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1174
  spstat->_vmop_type = (op != NULL ? op->type() : -1);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1175
  if (op != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1176
    _safepoint_reasons[spstat->_vmop_type]++;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1177
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1178
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1179
  spstat->_nof_total_threads = nof_threads;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1180
  spstat->_nof_initial_running_threads = nof_running;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1181
  spstat->_nof_threads_hit_page_trap = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1182
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1183
  // Records the start time of spinning. The real time spent on spinning
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1184
  // will be adjusted when spin is done. Same trick is applied for time
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1185
  // spent on waiting for threads to block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1186
  if (nof_running != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1187
    spstat->_time_to_spin = os::javaTimeNanos();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1188
  }  else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1189
    spstat->_time_to_spin = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1190
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1191
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1192
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1193
void SafepointSynchronize::update_statistics_on_spin_end() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1194
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1195
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1196
  jlong cur_time = os::javaTimeNanos();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1197
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1198
  spstat->_nof_threads_wait_to_block = _waiting_to_block;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1199
  if (spstat->_nof_initial_running_threads != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1200
    spstat->_time_to_spin = cur_time - spstat->_time_to_spin;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1201
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1202
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1203
  if (need_to_track_page_armed_status) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1204
    spstat->_page_armed = (PageArmed == 1);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1205
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1206
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1207
  // Records the start time of waiting for to block. Updated when block is done.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1208
  if (_waiting_to_block != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1209
    spstat->_time_to_wait_to_block = cur_time;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1210
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1211
    spstat->_time_to_wait_to_block = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1212
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1213
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1214
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1215
void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1216
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1217
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1218
  if (spstat->_nof_threads_wait_to_block != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1219
    spstat->_time_to_wait_to_block = end_time -
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1220
      spstat->_time_to_wait_to_block;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1221
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1222
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1223
  // Records the end time of sync which will be used to calculate the total
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1224
  // vm operation time. Again, the real time spending in syncing will be deducted
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1225
  // from the start of the sync time later when end_statistics is called.
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1226
  spstat->_time_to_sync = end_time - _safepoint_begin_time;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1227
  if (spstat->_time_to_sync > _max_sync_time) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1228
    _max_sync_time = spstat->_time_to_sync;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1229
  }
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1230
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1231
  spstat->_time_to_do_cleanups = end_time;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1232
}
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1233
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1234
void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1235
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1236
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1237
  // Record how long spent in cleanup tasks.
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1238
  spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1239
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1240
  cleanup_end_time = end_time;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1241
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1242
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1243
void SafepointSynchronize::end_statistics(jlong vmop_end_time) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1244
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1245
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1246
  // Update the vm operation time.
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1247
  spstat->_time_to_exec_vmop = vmop_end_time -  cleanup_end_time;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1248
  if (spstat->_time_to_exec_vmop > _max_vmop_time) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1249
    _max_vmop_time = spstat->_time_to_exec_vmop;
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1250
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1251
  // Only the sync time longer than the specified
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1252
  // PrintSafepointStatisticsTimeout will be printed out right away.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1253
  // By default, it is -1 meaning all samples will be put into the list.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1254
  if ( PrintSafepointStatisticsTimeout > 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1255
    if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1256
      print_statistics();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1257
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1258
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1259
    // The safepoint statistics will be printed out when the _safepoin_stats
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1260
    // array fills up.
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1261
    if (_cur_stat_index == PrintSafepointStatisticsCount - 1) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1262
      print_statistics();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1263
      _cur_stat_index = 0;
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1264
    } else {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1265
      _cur_stat_index++;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1266
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1267
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1268
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1269
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1270
void SafepointSynchronize::print_statistics() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1271
  SafepointStats* sstats = _safepoint_stats;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1272
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1273
  for (int index = 0; index <= _cur_stat_index; index++) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1274
    if (index % 30 == 0) {
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1275
      print_header();
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1276
    }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1277
    sstats = &_safepoint_stats[index];
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1278
    tty->print("%.3f: ", sstats->_time_stamp);
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1279
    tty->print("%-26s       ["
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1280
               INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15)
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1281
               "    ]    ",
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1282
               sstats->_vmop_type == -1 ? "no vm operation" :
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1283
               VM_Operation::name(sstats->_vmop_type),
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1284
               sstats->_nof_total_threads,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1285
               sstats->_nof_initial_running_threads,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1286
               sstats->_nof_threads_wait_to_block);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1287
    // "/ MICROUNITS " is to convert the unit from nanos to millis.
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1288
    tty->print("  ["
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1289
               INT64_FORMAT_W(6)INT64_FORMAT_W(6)
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1290
               INT64_FORMAT_W(6)INT64_FORMAT_W(6)
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1291
               INT64_FORMAT_W(6)"    ]  ",
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1292
               sstats->_time_to_spin / MICROUNITS,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1293
               sstats->_time_to_wait_to_block / MICROUNITS,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1294
               sstats->_time_to_sync / MICROUNITS,
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1295
               sstats->_time_to_do_cleanups / MICROUNITS,
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1296
               sstats->_time_to_exec_vmop / MICROUNITS);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1297
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1298
    if (need_to_track_page_armed_status) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1299
      tty->print(INT32_FORMAT"         ", sstats->_page_armed);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1300
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1301
    tty->print_cr(INT32_FORMAT"   ", sstats->_nof_threads_hit_page_trap);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1302
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1303
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1304
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1305
// This method will be called when VM exits. It will first call
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1306
// print_statistics to print out the rest of the sampling.  Then
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1307
// it tries to summarize the sampling.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1308
void SafepointSynchronize::print_stat_on_exit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1309
  if (_safepoint_stats == NULL) return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1310
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1311
  SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1312
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1313
  // During VM exit, end_statistics may not get called and in that
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1314
  // case, if the sync time is less than PrintSafepointStatisticsTimeout,
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1315
  // don't print it out.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1316
  // Approximate the vm op time.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1317
  _safepoint_stats[_cur_stat_index]._time_to_exec_vmop =
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1318
    os::javaTimeNanos() - cleanup_end_time;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1319
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1320
  if ( PrintSafepointStatisticsTimeout < 0 ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1321
       spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1322
    print_statistics();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1323
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1324
  tty->print_cr("");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1325
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1326
  // Print out polling page sampling status.
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1327
  if (!need_to_track_page_armed_status) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1328
    if (UseCompilerSafepoints) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1329
      tty->print_cr("Polling page always armed");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1330
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1331
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1332
    tty->print_cr("Defer polling page loop count = %d\n",
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1333
                 DeferPollingPageLoopCount);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1334
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1335
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1336
  for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1337
    if (_safepoint_reasons[index] != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1338
      tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index),
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1339
                    _safepoint_reasons[index]);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1340
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1341
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1342
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1343
  tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint",
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1344
                _coalesced_vmop_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1345
  tty->print_cr("Maximum sync time  "INT64_FORMAT_W(5)" ms",
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1346
                _max_sync_time / MICROUNITS);
5042
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1347
  tty->print_cr("Maximum vm operation time (except for Exit VM operation)  "
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1348
                INT64_FORMAT_W(5)" ms",
f86707fd195a 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 4006
diff changeset
  1349
                _max_vmop_time / MICROUNITS);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1350
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1351
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1352
// ------------------------------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1353
// Non-product code
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1354
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1355
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1356
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1357
void SafepointSynchronize::print_state() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1358
  if (_state == _not_synchronized) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1359
    tty->print_cr("not synchronized");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1360
  } else if (_state == _synchronizing || _state == _synchronized) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1361
    tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" :
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1362
                  "synchronized");
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1363
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1364
    for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1365
       cur->safepoint_state()->print();
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1366
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1367
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1368
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1369
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1370
void SafepointSynchronize::safepoint_msg(const char* format, ...) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1371
  if (ShowSafepointMsgs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1372
    va_list ap;
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1373
    va_start(ap, format);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1374
    tty->vprint_cr(format, ap);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1375
    va_end(ap);
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1376
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1377
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1378
489c9b5090e2 Initial load
duke
parents:
diff changeset
  1379
#endif // !PRODUCT