annotate src/share/vm/runtime/safepoint.cpp @ 18096:ca6d25be853b jdk8u25-b13

8044269: Analysis of archive files. Summary: Add checksum verification. Reviewed-by: iklam, dholmes, mschoene
author jiangli
date Tue, 12 Aug 2014 17:46:16 -0400
parents 78bbf4d43a14
children 52b4284cb496 581e70386ec9
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1 /*
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/symbolTable.hpp"
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27 #include "classfile/systemDictionary.hpp"
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28 #include "code/codeCache.hpp"
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29 #include "code/icBuffer.hpp"
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30 #include "code/nmethod.hpp"
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31 #include "code/pcDesc.hpp"
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32 #include "code/scopeDesc.hpp"
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33 #include "gc_interface/collectedHeap.hpp"
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34 #include "interpreter/interpreter.hpp"
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35 #include "memory/resourceArea.hpp"
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36 #include "memory/universe.inline.hpp"
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37 #include "oops/oop.inline.hpp"
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38 #include "oops/symbol.hpp"
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39 #include "runtime/compilationPolicy.hpp"
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40 #include "runtime/deoptimization.hpp"
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41 #include "runtime/frame.inline.hpp"
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42 #include "runtime/interfaceSupport.hpp"
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43 #include "runtime/mutexLocker.hpp"
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44 #include "runtime/osThread.hpp"
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45 #include "runtime/safepoint.hpp"
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46 #include "runtime/signature.hpp"
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47 #include "runtime/stubCodeGenerator.hpp"
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48 #include "runtime/stubRoutines.hpp"
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49 #include "runtime/sweeper.hpp"
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50 #include "runtime/synchronizer.hpp"
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51 #include "runtime/thread.inline.hpp"
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52 #include "services/memTracker.hpp"
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53 #include "services/runtimeService.hpp"
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54 #include "utilities/events.hpp"
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55 #include "utilities/macros.hpp"
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56 #ifdef TARGET_ARCH_x86
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57 # include "nativeInst_x86.hpp"
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58 # include "vmreg_x86.inline.hpp"
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59 #endif
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60 #ifdef TARGET_ARCH_sparc
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61 # include "nativeInst_sparc.hpp"
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62 # include "vmreg_sparc.inline.hpp"
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63 #endif
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64 #ifdef TARGET_ARCH_zero
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65 # include "nativeInst_zero.hpp"
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66 # include "vmreg_zero.inline.hpp"
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67 #endif
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68 #ifdef TARGET_ARCH_arm
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69 # include "nativeInst_arm.hpp"
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70 # include "vmreg_arm.inline.hpp"
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71 #endif
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72 #ifdef TARGET_ARCH_ppc
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73 # include "nativeInst_ppc.hpp"
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74 # include "vmreg_ppc.inline.hpp"
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75 #endif
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76 #if INCLUDE_ALL_GCS
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77 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
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78 #include "gc_implementation/shared/concurrentGCThread.hpp"
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79 #endif // INCLUDE_ALL_GCS
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80 #ifdef COMPILER1
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81 #include "c1/c1_globals.hpp"
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82 #endif
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83
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84 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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85
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86 // --------------------------------------------------------------------------------------------------
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87 // Implementation of Safepoint begin/end
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88
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89 SafepointSynchronize::SynchronizeState volatile SafepointSynchronize::_state = SafepointSynchronize::_not_synchronized;
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90 volatile int SafepointSynchronize::_waiting_to_block = 0;
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91 volatile int SafepointSynchronize::_safepoint_counter = 0;
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92 int SafepointSynchronize::_current_jni_active_count = 0;
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93 long SafepointSynchronize::_end_of_last_safepoint = 0;
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94 static volatile int PageArmed = 0 ; // safepoint polling page is RO|RW vs PROT_NONE
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95 static volatile int TryingToBlock = 0 ; // proximate value -- for advisory use only
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96 static bool timeout_error_printed = false;
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97
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98 // Roll all threads forward to a safepoint and suspend them all
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99 void SafepointSynchronize::begin() {
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100
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101 Thread* myThread = Thread::current();
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102 assert(myThread->is_VM_thread(), "Only VM thread may execute a safepoint");
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103
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104 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) {
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105 _safepoint_begin_time = os::javaTimeNanos();
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106 _ts_of_current_safepoint = tty->time_stamp().seconds();
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107 }
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108
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109 #if INCLUDE_ALL_GCS
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110 if (UseConcMarkSweepGC) {
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111 // In the future we should investigate whether CMS can use the
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112 // more-general mechanism below. DLD (01/05).
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113 ConcurrentMarkSweepThread::synchronize(false);
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114 } else if (UseG1GC) {
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115 ConcurrentGCThread::safepoint_synchronize();
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116 }
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117 #endif // INCLUDE_ALL_GCS
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118
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119 // By getting the Threads_lock, we assure that no threads are about to start or
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120 // exit. It is released again in SafepointSynchronize::end().
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121 Threads_lock->lock();
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122
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123 assert( _state == _not_synchronized, "trying to safepoint synchronize with wrong state");
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124
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125 int nof_threads = Threads::number_of_threads();
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126
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127 if (TraceSafepoint) {
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128 tty->print_cr("Safepoint synchronization initiated. (%d)", nof_threads);
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129 }
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130
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131 RuntimeService::record_safepoint_begin();
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132
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133 MutexLocker mu(Safepoint_lock);
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134
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135 // Reset the count of active JNI critical threads
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136 _current_jni_active_count = 0;
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137
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138 // Set number of threads to wait for, before we initiate the callbacks
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139 _waiting_to_block = nof_threads;
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140 TryingToBlock = 0 ;
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141 int still_running = nof_threads;
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142
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143 // Save the starting time, so that it can be compared to see if this has taken
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144 // too long to complete.
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145 jlong safepoint_limit_time;
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146 timeout_error_printed = false;
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147
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148 // PrintSafepointStatisticsTimeout can be specified separately. When
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149 // specified, PrintSafepointStatistics will be set to true in
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150 // deferred_initialize_stat method. The initialization has to be done
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151 // early enough to avoid any races. See bug 6880029 for details.
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152 if (PrintSafepointStatistics || PrintSafepointStatisticsTimeout > 0) {
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153 deferred_initialize_stat();
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154 }
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155
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156 // Begin the process of bringing the system to a safepoint.
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157 // Java threads can be in several different states and are
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158 // stopped by different mechanisms:
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159 //
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160 // 1. Running interpreted
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161 // The interpeter dispatch table is changed to force it to
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162 // check for a safepoint condition between bytecodes.
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163 // 2. Running in native code
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164 // When returning from the native code, a Java thread must check
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165 // the safepoint _state to see if we must block. If the
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166 // VM thread sees a Java thread in native, it does
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167 // not wait for this thread to block. The order of the memory
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168 // writes and reads of both the safepoint state and the Java
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169 // threads state is critical. In order to guarantee that the
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170 // memory writes are serialized with respect to each other,
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171 // the VM thread issues a memory barrier instruction
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172 // (on MP systems). In order to avoid the overhead of issuing
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173 // a memory barrier for each Java thread making native calls, each Java
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174 // thread performs a write to a single memory page after changing
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175 // the thread state. The VM thread performs a sequence of
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176 // mprotect OS calls which forces all previous writes from all
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177 // Java threads to be serialized. This is done in the
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178 // os::serialize_thread_states() call. This has proven to be
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179 // much more efficient than executing a membar instruction
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180 // on every call to native code.
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181 // 3. Running compiled Code
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182 // Compiled code reads a global (Safepoint Polling) page that
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183 // is set to fault if we are trying to get to a safepoint.
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184 // 4. Blocked
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185 // A thread which is blocked will not be allowed to return from the
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186 // block condition until the safepoint operation is complete.
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187 // 5. In VM or Transitioning between states
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188 // If a Java thread is currently running in the VM or transitioning
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189 // between states, the safepointing code will wait for the thread to
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190 // block itself when it attempts transitions to a new state.
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191 //
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192 _state = _synchronizing;
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193 OrderAccess::fence();
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194
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195 // Flush all thread states to memory
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196 if (!UseMembar) {
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197 os::serialize_thread_states();
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198 }
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199
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200 // Make interpreter safepoint aware
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201 Interpreter::notice_safepoints();
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202
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203 if (UseCompilerSafepoints && DeferPollingPageLoopCount < 0) {
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204 // Make polling safepoint aware
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205 guarantee (PageArmed == 0, "invariant") ;
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206 PageArmed = 1 ;
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207 os::make_polling_page_unreadable();
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208 }
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209
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210 // Consider using active_processor_count() ... but that call is expensive.
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211 int ncpus = os::processor_count() ;
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212
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213 #ifdef ASSERT
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214 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
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215 assert(cur->safepoint_state()->is_running(), "Illegal initial state");
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216 // Clear the visited flag to ensure that the critical counts are collected properly.
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217 cur->set_visited_for_critical_count(false);
0
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218 }
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219 #endif // ASSERT
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220
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221 if (SafepointTimeout)
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222 safepoint_limit_time = os::javaTimeNanos() + (jlong)SafepointTimeoutDelay * MICROUNITS;
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223
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224 // Iterate through all threads until it have been determined how to stop them all at a safepoint
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225 unsigned int iterations = 0;
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226 int steps = 0 ;
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227 while(still_running > 0) {
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228 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
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229 assert(!cur->is_ConcurrentGC_thread(), "A concurrent GC thread is unexpectly being suspended");
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230 ThreadSafepointState *cur_state = cur->safepoint_state();
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231 if (cur_state->is_running()) {
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232 cur_state->examine_state_of_thread();
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233 if (!cur_state->is_running()) {
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234 still_running--;
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235 // consider adjusting steps downward:
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236 // steps = 0
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237 // steps -= NNN
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238 // steps >>= 1
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239 // steps = MIN(steps, 2000-100)
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240 // if (iterations != 0) steps -= NNN
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241 }
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242 if (TraceSafepoint && Verbose) cur_state->print();
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243 }
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244 }
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245
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246 if (PrintSafepointStatistics && iterations == 0) {
0
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247 begin_statistics(nof_threads, still_running);
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248 }
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249
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250 if (still_running > 0) {
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251 // Check for if it takes to long
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252 if (SafepointTimeout && safepoint_limit_time < os::javaTimeNanos()) {
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253 print_safepoint_timeout(_spinning_timeout);
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254 }
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255
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256 // Spin to avoid context switching.
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257 // There's a tension between allowing the mutators to run (and rendezvous)
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258 // vs spinning. As the VM thread spins, wasting cycles, it consumes CPU that
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259 // a mutator might otherwise use profitably to reach a safepoint. Excessive
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260 // spinning by the VM thread on a saturated system can increase rendezvous latency.
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261 // Blocking or yielding incur their own penalties in the form of context switching
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262 // and the resultant loss of $ residency.
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263 //
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264 // Further complicating matters is that yield() does not work as naively expected
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265 // on many platforms -- yield() does not guarantee that any other ready threads
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266 // will run. As such we revert yield_all() after some number of iterations.
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267 // Yield_all() is implemented as a short unconditional sleep on some platforms.
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268 // Typical operating systems round a "short" sleep period up to 10 msecs, so sleeping
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269 // can actually increase the time it takes the VM thread to detect that a system-wide
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270 // stop-the-world safepoint has been reached. In a pathological scenario such as that
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271 // described in CR6415670 the VMthread may sleep just before the mutator(s) become safe.
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272 // In that case the mutators will be stalled waiting for the safepoint to complete and the
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273 // the VMthread will be sleeping, waiting for the mutators to rendezvous. The VMthread
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274 // will eventually wake up and detect that all mutators are safe, at which point
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275 // we'll again make progress.
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276 //
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277 // Beware too that that the VMThread typically runs at elevated priority.
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278 // Its default priority is higher than the default mutator priority.
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279 // Obviously, this complicates spinning.
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280 //
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281 // Note too that on Windows XP SwitchThreadTo() has quite different behavior than Sleep(0).
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282 // Sleep(0) will _not yield to lower priority threads, while SwitchThreadTo() will.
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283 //
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284 // See the comments in synchronizer.cpp for additional remarks on spinning.
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285 //
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286 // In the future we might:
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287 // 1. Modify the safepoint scheme to avoid potentally unbounded spinning.
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288 // This is tricky as the path used by a thread exiting the JVM (say on
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289 // on JNI call-out) simply stores into its state field. The burden
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290 // is placed on the VM thread, which must poll (spin).
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291 // 2. Find something useful to do while spinning. If the safepoint is GC-related
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292 // we might aggressively scan the stacks of threads that are already safe.
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293 // 3. Use Solaris schedctl to examine the state of the still-running mutators.
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294 // If all the mutators are ONPROC there's no reason to sleep or yield.
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295 // 4. YieldTo() any still-running mutators that are ready but OFFPROC.
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296 // 5. Check system saturation. If the system is not fully saturated then
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297 // simply spin and avoid sleep/yield.
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298 // 6. As still-running mutators rendezvous they could unpark the sleeping
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299 // VMthread. This works well for still-running mutators that become
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300 // safe. The VMthread must still poll for mutators that call-out.
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301 // 7. Drive the policy on time-since-begin instead of iterations.
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302 // 8. Consider making the spin duration a function of the # of CPUs:
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303 // Spin = (((ncpus-1) * M) + K) + F(still_running)
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304 // Alternately, instead of counting iterations of the outer loop
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305 // we could count the # of threads visited in the inner loop, above.
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306 // 9. On windows consider using the return value from SwitchThreadTo()
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307 // to drive subsequent spin/SwitchThreadTo()/Sleep(N) decisions.
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308
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309 if (UseCompilerSafepoints && int(iterations) == DeferPollingPageLoopCount) {
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310 guarantee (PageArmed == 0, "invariant") ;
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311 PageArmed = 1 ;
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312 os::make_polling_page_unreadable();
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313 }
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314
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315 // Instead of (ncpus > 1) consider either (still_running < (ncpus + EPSILON)) or
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316 // ((still_running + _waiting_to_block - TryingToBlock)) < ncpus)
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317 ++steps ;
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318 if (ncpus > 1 && steps < SafepointSpinBeforeYield) {
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319 SpinPause() ; // MP-Polite spin
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320 } else
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321 if (steps < DeferThrSuspendLoopCount) {
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322 os::NakedYield() ;
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323 } else {
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324 os::yield_all(steps) ;
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325 // Alternately, the VM thread could transiently depress its scheduling priority or
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326 // transiently increase the priority of the tardy mutator(s).
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327 }
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328
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329 iterations ++ ;
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330 }
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331 assert(iterations < (uint)max_jint, "We have been iterating in the safepoint loop too long");
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332 }
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333 assert(still_running == 0, "sanity check");
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334
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335 if (PrintSafepointStatistics) {
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336 update_statistics_on_spin_end();
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337 }
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338
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339 // wait until all threads are stopped
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340 while (_waiting_to_block > 0) {
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341 if (TraceSafepoint) tty->print_cr("Waiting for %d thread(s) to block", _waiting_to_block);
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342 if (!SafepointTimeout || timeout_error_printed) {
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343 Safepoint_lock->wait(true); // true, means with no safepoint checks
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344 } else {
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345 // Compute remaining time
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346 jlong remaining_time = safepoint_limit_time - os::javaTimeNanos();
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347
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348 // If there is no remaining time, then there is an error
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349 if (remaining_time < 0 || Safepoint_lock->wait(true, remaining_time / MICROUNITS)) {
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350 print_safepoint_timeout(_blocking_timeout);
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351 }
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352 }
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353 }
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354 assert(_waiting_to_block == 0, "sanity check");
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355
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356 #ifndef PRODUCT
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357 if (SafepointTimeout) {
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358 jlong current_time = os::javaTimeNanos();
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359 if (safepoint_limit_time < current_time) {
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360 tty->print_cr("# SafepointSynchronize: Finished after "
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361 INT64_FORMAT_W(6) " ms",
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362 ((current_time - safepoint_limit_time) / MICROUNITS +
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363 SafepointTimeoutDelay));
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364 }
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365 }
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366 #endif
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367
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368 assert((_safepoint_counter & 0x1) == 0, "must be even");
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369 assert(Threads_lock->owned_by_self(), "must hold Threads_lock");
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370 _safepoint_counter ++;
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371
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372 // Record state
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373 _state = _synchronized;
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374
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375 OrderAccess::fence();
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376
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377 #ifdef ASSERT
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378 for (JavaThread *cur = Threads::first(); cur != NULL; cur = cur->next()) {
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379 // make sure all the threads were visited
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380 assert(cur->was_visited_for_critical_count(), "missed a thread");
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381 }
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382 #endif // ASSERT
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383
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384 // Update the count of active JNI critical regions
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385 GC_locker::set_jni_lock_count(_current_jni_active_count);
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386
0
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387 if (TraceSafepoint) {
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388 VM_Operation *op = VMThread::vm_operation();
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389 tty->print_cr("Entering safepoint region: %s", (op != NULL) ? op->name() : "no vm operation");
a61af66fc99e Initial load
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parents:
diff changeset
390 }
a61af66fc99e Initial load
duke
parents:
diff changeset
391
a61af66fc99e Initial load
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parents:
diff changeset
392 RuntimeService::record_safepoint_synchronized();
a61af66fc99e Initial load
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parents:
diff changeset
393 if (PrintSafepointStatistics) {
a61af66fc99e Initial load
duke
parents:
diff changeset
394 update_statistics_on_sync_end(os::javaTimeNanos());
a61af66fc99e Initial load
duke
parents:
diff changeset
395 }
a61af66fc99e Initial load
duke
parents:
diff changeset
396
a61af66fc99e Initial load
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parents:
diff changeset
397 // Call stuff that needs to be run when a safepoint is just about to be completed
a61af66fc99e Initial load
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parents:
diff changeset
398 do_cleanup_tasks();
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
399
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
400 if (PrintSafepointStatistics) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
401 // Record how much time spend on the above cleanup tasks
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
402 update_statistics_on_cleanup_end(os::javaTimeNanos());
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
403 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
404 }
a61af66fc99e Initial load
duke
parents:
diff changeset
405
a61af66fc99e Initial load
duke
parents:
diff changeset
406 // Wake up all threads, so they are ready to resume execution after the safepoint
a61af66fc99e Initial load
duke
parents:
diff changeset
407 // operation has been carried out
a61af66fc99e Initial load
duke
parents:
diff changeset
408 void SafepointSynchronize::end() {
a61af66fc99e Initial load
duke
parents:
diff changeset
409
a61af66fc99e Initial load
duke
parents:
diff changeset
410 assert(Threads_lock->owned_by_self(), "must hold Threads_lock");
a61af66fc99e Initial load
duke
parents:
diff changeset
411 assert((_safepoint_counter & 0x1) == 1, "must be odd");
a61af66fc99e Initial load
duke
parents:
diff changeset
412 _safepoint_counter ++;
a61af66fc99e Initial load
duke
parents:
diff changeset
413 // memory fence isn't required here since an odd _safepoint_counter
a61af66fc99e Initial load
duke
parents:
diff changeset
414 // value can do no harm and a fence is issued below anyway.
a61af66fc99e Initial load
duke
parents:
diff changeset
415
a61af66fc99e Initial load
duke
parents:
diff changeset
416 DEBUG_ONLY(Thread* myThread = Thread::current();)
a61af66fc99e Initial load
duke
parents:
diff changeset
417 assert(myThread->is_VM_thread(), "Only VM thread can execute a safepoint");
a61af66fc99e Initial load
duke
parents:
diff changeset
418
a61af66fc99e Initial load
duke
parents:
diff changeset
419 if (PrintSafepointStatistics) {
a61af66fc99e Initial load
duke
parents:
diff changeset
420 end_statistics(os::javaTimeNanos());
a61af66fc99e Initial load
duke
parents:
diff changeset
421 }
a61af66fc99e Initial load
duke
parents:
diff changeset
422
a61af66fc99e Initial load
duke
parents:
diff changeset
423 #ifdef ASSERT
a61af66fc99e Initial load
duke
parents:
diff changeset
424 // A pending_exception cannot be installed during a safepoint. The threads
a61af66fc99e Initial load
duke
parents:
diff changeset
425 // may install an async exception after they come back from a safepoint into
a61af66fc99e Initial load
duke
parents:
diff changeset
426 // pending_exception after they unblock. But that should happen later.
a61af66fc99e Initial load
duke
parents:
diff changeset
427 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
428 assert (!(cur->has_pending_exception() &&
a61af66fc99e Initial load
duke
parents:
diff changeset
429 cur->safepoint_state()->is_at_poll_safepoint()),
a61af66fc99e Initial load
duke
parents:
diff changeset
430 "safepoint installed a pending exception");
a61af66fc99e Initial load
duke
parents:
diff changeset
431 }
a61af66fc99e Initial load
duke
parents:
diff changeset
432 #endif // ASSERT
a61af66fc99e Initial load
duke
parents:
diff changeset
433
a61af66fc99e Initial load
duke
parents:
diff changeset
434 if (PageArmed) {
a61af66fc99e Initial load
duke
parents:
diff changeset
435 // Make polling safepoint aware
a61af66fc99e Initial load
duke
parents:
diff changeset
436 os::make_polling_page_readable();
a61af66fc99e Initial load
duke
parents:
diff changeset
437 PageArmed = 0 ;
a61af66fc99e Initial load
duke
parents:
diff changeset
438 }
a61af66fc99e Initial load
duke
parents:
diff changeset
439
a61af66fc99e Initial load
duke
parents:
diff changeset
440 // Remove safepoint check from interpreter
a61af66fc99e Initial load
duke
parents:
diff changeset
441 Interpreter::ignore_safepoints();
a61af66fc99e Initial load
duke
parents:
diff changeset
442
a61af66fc99e Initial load
duke
parents:
diff changeset
443 {
a61af66fc99e Initial load
duke
parents:
diff changeset
444 MutexLocker mu(Safepoint_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
445
a61af66fc99e Initial load
duke
parents:
diff changeset
446 assert(_state == _synchronized, "must be synchronized before ending safepoint synchronization");
a61af66fc99e Initial load
duke
parents:
diff changeset
447
a61af66fc99e Initial load
duke
parents:
diff changeset
448 // Set to not synchronized, so the threads will not go into the signal_thread_blocked method
a61af66fc99e Initial load
duke
parents:
diff changeset
449 // when they get restarted.
a61af66fc99e Initial load
duke
parents:
diff changeset
450 _state = _not_synchronized;
a61af66fc99e Initial load
duke
parents:
diff changeset
451 OrderAccess::fence();
a61af66fc99e Initial load
duke
parents:
diff changeset
452
a61af66fc99e Initial load
duke
parents:
diff changeset
453 if (TraceSafepoint) {
a61af66fc99e Initial load
duke
parents:
diff changeset
454 tty->print_cr("Leaving safepoint region");
a61af66fc99e Initial load
duke
parents:
diff changeset
455 }
a61af66fc99e Initial load
duke
parents:
diff changeset
456
a61af66fc99e Initial load
duke
parents:
diff changeset
457 // Start suspended threads
a61af66fc99e Initial load
duke
parents:
diff changeset
458 for(JavaThread *current = Threads::first(); current; current = current->next()) {
605
98cb887364d3 6810672: Comment typos
twisti
parents: 513
diff changeset
459 // A problem occurring on Solaris is when attempting to restart threads
0
a61af66fc99e Initial load
duke
parents:
diff changeset
460 // the first #cpus - 1 go well, but then the VMThread is preempted when we get
a61af66fc99e Initial load
duke
parents:
diff changeset
461 // to the next one (since it has been running the longest). We then have
a61af66fc99e Initial load
duke
parents:
diff changeset
462 // to wait for a cpu to become available before we can continue restarting
a61af66fc99e Initial load
duke
parents:
diff changeset
463 // threads.
a61af66fc99e Initial load
duke
parents:
diff changeset
464 // FIXME: This causes the performance of the VM to degrade when active and with
a61af66fc99e Initial load
duke
parents:
diff changeset
465 // large numbers of threads. Apparently this is due to the synchronous nature
a61af66fc99e Initial load
duke
parents:
diff changeset
466 // of suspending threads.
a61af66fc99e Initial load
duke
parents:
diff changeset
467 //
a61af66fc99e Initial load
duke
parents:
diff changeset
468 // TODO-FIXME: the comments above are vestigial and no longer apply.
a61af66fc99e Initial load
duke
parents:
diff changeset
469 // Furthermore, using solaris' schedctl in this particular context confers no benefit
a61af66fc99e Initial load
duke
parents:
diff changeset
470 if (VMThreadHintNoPreempt) {
a61af66fc99e Initial load
duke
parents:
diff changeset
471 os::hint_no_preempt();
a61af66fc99e Initial load
duke
parents:
diff changeset
472 }
a61af66fc99e Initial load
duke
parents:
diff changeset
473 ThreadSafepointState* cur_state = current->safepoint_state();
a61af66fc99e Initial load
duke
parents:
diff changeset
474 assert(cur_state->type() != ThreadSafepointState::_running, "Thread not suspended at safepoint");
a61af66fc99e Initial load
duke
parents:
diff changeset
475 cur_state->restart();
a61af66fc99e Initial load
duke
parents:
diff changeset
476 assert(cur_state->is_running(), "safepoint state has not been reset");
a61af66fc99e Initial load
duke
parents:
diff changeset
477 }
a61af66fc99e Initial load
duke
parents:
diff changeset
478
a61af66fc99e Initial load
duke
parents:
diff changeset
479 RuntimeService::record_safepoint_end();
a61af66fc99e Initial load
duke
parents:
diff changeset
480
a61af66fc99e Initial load
duke
parents:
diff changeset
481 // Release threads lock, so threads can be created/destroyed again. It will also starts all threads
a61af66fc99e Initial load
duke
parents:
diff changeset
482 // blocked in signal_thread_blocked
a61af66fc99e Initial load
duke
parents:
diff changeset
483 Threads_lock->unlock();
a61af66fc99e Initial load
duke
parents:
diff changeset
484
a61af66fc99e Initial load
duke
parents:
diff changeset
485 }
8001
db9981fd3124 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 7180
diff changeset
486 #if INCLUDE_ALL_GCS
0
a61af66fc99e Initial load
duke
parents:
diff changeset
487 // If there are any concurrent GC threads resume them.
a61af66fc99e Initial load
duke
parents:
diff changeset
488 if (UseConcMarkSweepGC) {
a61af66fc99e Initial load
duke
parents:
diff changeset
489 ConcurrentMarkSweepThread::desynchronize(false);
845
df6caf649ff7 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 628
diff changeset
490 } else if (UseG1GC) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
491 ConcurrentGCThread::safepoint_desynchronize();
a61af66fc99e Initial load
duke
parents:
diff changeset
492 }
8001
db9981fd3124 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 7180
diff changeset
493 #endif // INCLUDE_ALL_GCS
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
494 // record this time so VMThread can keep track how much time has elasped
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
495 // since last safepoint.
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
496 _end_of_last_safepoint = os::javaTimeMillis();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
497 }
a61af66fc99e Initial load
duke
parents:
diff changeset
498
a61af66fc99e Initial load
duke
parents:
diff changeset
499 bool SafepointSynchronize::is_cleanup_needed() {
a61af66fc99e Initial load
duke
parents:
diff changeset
500 // Need a safepoint if some inline cache buffers is non-empty
a61af66fc99e Initial load
duke
parents:
diff changeset
501 if (!InlineCacheBuffer::is_empty()) return true;
a61af66fc99e Initial load
duke
parents:
diff changeset
502 return false;
a61af66fc99e Initial load
duke
parents:
diff changeset
503 }
a61af66fc99e Initial load
duke
parents:
diff changeset
504
a61af66fc99e Initial load
duke
parents:
diff changeset
505
a61af66fc99e Initial load
duke
parents:
diff changeset
506
a61af66fc99e Initial load
duke
parents:
diff changeset
507 // Various cleaning tasks that should be done periodically at safepoints
a61af66fc99e Initial load
duke
parents:
diff changeset
508 void SafepointSynchronize::do_cleanup_tasks() {
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
509 {
1321
0f6600cee529 6934758: Expose the break down of clean up task time during safepoint.
xlu
parents: 1291
diff changeset
510 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime);
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
511 ObjectSynchronizer::deflate_idle_monitors();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
512 }
a61af66fc99e Initial load
duke
parents:
diff changeset
513
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
514 {
1321
0f6600cee529 6934758: Expose the break down of clean up task time during safepoint.
xlu
parents: 1291
diff changeset
515 TraceTime t2("updating inline caches", TraceSafepointCleanupTime);
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
516 InlineCacheBuffer::update_inline_caches();
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
517 }
1783
d5d065957597 6953144: Tiered compilation
iveresov
parents: 1727
diff changeset
518 {
d5d065957597 6953144: Tiered compilation
iveresov
parents: 1727
diff changeset
519 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime);
d5d065957597 6953144: Tiered compilation
iveresov
parents: 1727
diff changeset
520 CompilationPolicy::policy()->do_safepoint_work();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
521 }
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
522
6162
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
523 {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 9060
diff changeset
524 TraceTime t4("mark nmethods", TraceSafepointCleanupTime);
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 9060
diff changeset
525 NMethodSweeper::mark_active_nmethods();
6162
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
526 }
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
527
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
528 if (SymbolTable::needs_rehashing()) {
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
529 TraceTime t5("rehashing symbol table", TraceSafepointCleanupTime);
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
530 SymbolTable::rehash_table();
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
531 }
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
532
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
533 if (StringTable::needs_rehashing()) {
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
534 TraceTime t6("rehashing string table", TraceSafepointCleanupTime);
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
535 StringTable::rehash_table();
e9140bf80b4a 7158800: Improve storage of symbol tables
coleenp
parents: 5928
diff changeset
536 }
3767
2a241e764894 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 2426
diff changeset
537
2a241e764894 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 2426
diff changeset
538 // rotate log files?
2a241e764894 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 2426
diff changeset
539 if (UseGCLogFileRotation) {
17827
f42c10a3d4b1 7090324: gclog rotation via external tool
minqi
parents: 12334
diff changeset
540 gclog_or_tty->rotate_log(false);
3767
2a241e764894 6941923: RFE: Handling large log files produced by long running Java Applications
minqi
parents: 2426
diff changeset
541 }
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 6162
diff changeset
542
17935
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
543 {
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
544 // CMS delays purging the CLDG until the beginning of the next safepoint and to
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
545 // make sure concurrent sweep is done
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
546 TraceTime t7("purging class loader data graph", TraceSafepointCleanupTime);
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
547 ClassLoaderDataGraph::purge_if_needed();
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
548 }
7384f6a12fc1 8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
parents: 17827
diff changeset
549
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 6162
diff changeset
550 if (MemTracker::is_on()) {
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 6162
diff changeset
551 MemTracker::sync();
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 6162
diff changeset
552 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
553 }
a61af66fc99e Initial load
duke
parents:
diff changeset
554
a61af66fc99e Initial load
duke
parents:
diff changeset
555
a61af66fc99e Initial load
duke
parents:
diff changeset
556 bool SafepointSynchronize::safepoint_safe(JavaThread *thread, JavaThreadState state) {
a61af66fc99e Initial load
duke
parents:
diff changeset
557 switch(state) {
a61af66fc99e Initial load
duke
parents:
diff changeset
558 case _thread_in_native:
a61af66fc99e Initial load
duke
parents:
diff changeset
559 // native threads are safe if they have no java stack or have walkable stack
a61af66fc99e Initial load
duke
parents:
diff changeset
560 return !thread->has_last_Java_frame() || thread->frame_anchor()->walkable();
a61af66fc99e Initial load
duke
parents:
diff changeset
561
a61af66fc99e Initial load
duke
parents:
diff changeset
562 // blocked threads should have already have walkable stack
a61af66fc99e Initial load
duke
parents:
diff changeset
563 case _thread_blocked:
a61af66fc99e Initial load
duke
parents:
diff changeset
564 assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "blocked and not walkable");
a61af66fc99e Initial load
duke
parents:
diff changeset
565 return true;
a61af66fc99e Initial load
duke
parents:
diff changeset
566
a61af66fc99e Initial load
duke
parents:
diff changeset
567 default:
a61af66fc99e Initial load
duke
parents:
diff changeset
568 return false;
a61af66fc99e Initial load
duke
parents:
diff changeset
569 }
a61af66fc99e Initial load
duke
parents:
diff changeset
570 }
a61af66fc99e Initial load
duke
parents:
diff changeset
571
a61af66fc99e Initial load
duke
parents:
diff changeset
572
4873
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
573 // See if the thread is running inside a lazy critical native and
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
574 // update the thread critical count if so. Also set a suspend flag to
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
575 // cause the native wrapper to return into the JVM to do the unlock
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
576 // once the native finishes.
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
577 void SafepointSynchronize::check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state) {
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
578 if (state == _thread_in_native &&
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
579 thread->has_last_Java_frame() &&
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
580 thread->frame_anchor()->walkable()) {
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
581 // This thread might be in a critical native nmethod so look at
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
582 // the top of the stack and increment the critical count if it
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
583 // is.
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
584 frame wrapper_frame = thread->last_frame();
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
585 CodeBlob* stub_cb = wrapper_frame.cb();
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
586 if (stub_cb != NULL &&
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
587 stub_cb->is_nmethod() &&
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
588 stub_cb->as_nmethod_or_null()->is_lazy_critical_native()) {
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
589 // A thread could potentially be in a critical native across
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
590 // more than one safepoint, so only update the critical state on
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
591 // the first one. When it returns it will perform the unlock.
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
592 if (!thread->do_critical_native_unlock()) {
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
593 #ifdef ASSERT
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
594 if (!thread->in_critical()) {
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
595 GC_locker::increment_debug_jni_lock_count();
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
596 }
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
597 #endif
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
598 thread->enter_critical();
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
599 // Make sure the native wrapper calls back on return to
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
600 // perform the needed critical unlock.
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
601 thread->set_critical_native_unlock();
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
602 }
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
603 }
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
604 }
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
605 }
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
606
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
607
0382d2b469b2 7013347: allow crypto functions to be called inline to enhance performance
never
parents: 4867
diff changeset
608
0
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parents:
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609 // -------------------------------------------------------------------------------------------------------
a61af66fc99e Initial load
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parents:
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610 // Implementation of Safepoint callback point
a61af66fc99e Initial load
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parents:
diff changeset
611
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parents:
diff changeset
612 void SafepointSynchronize::block(JavaThread *thread) {
a61af66fc99e Initial load
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parents:
diff changeset
613 assert(thread != NULL, "thread must be set");
a61af66fc99e Initial load
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parents:
diff changeset
614 assert(thread->is_Java_thread(), "not a Java thread");
a61af66fc99e Initial load
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parents:
diff changeset
615
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parents:
diff changeset
616 // Threads shouldn't block if they are in the middle of printing, but...
a61af66fc99e Initial load
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parents:
diff changeset
617 ttyLocker::break_tty_lock_for_safepoint(os::current_thread_id());
a61af66fc99e Initial load
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parents:
diff changeset
618
a61af66fc99e Initial load
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parents:
diff changeset
619 // Only bail from the block() call if the thread is gone from the
a61af66fc99e Initial load
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parents:
diff changeset
620 // thread list; starting to exit should still block.
a61af66fc99e Initial load
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parents:
diff changeset
621 if (thread->is_terminated()) {
a61af66fc99e Initial load
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parents:
diff changeset
622 // block current thread if we come here from native code when VM is gone
a61af66fc99e Initial load
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parents:
diff changeset
623 thread->block_if_vm_exited();
a61af66fc99e Initial load
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parents:
diff changeset
624
a61af66fc99e Initial load
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parents:
diff changeset
625 // otherwise do nothing
a61af66fc99e Initial load
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parents:
diff changeset
626 return;
a61af66fc99e Initial load
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parents:
diff changeset
627 }
a61af66fc99e Initial load
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parents:
diff changeset
628
a61af66fc99e Initial load
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parents:
diff changeset
629 JavaThreadState state = thread->thread_state();
a61af66fc99e Initial load
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parents:
diff changeset
630 thread->frame_anchor()->make_walkable(thread);
a61af66fc99e Initial load
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parents:
diff changeset
631
a61af66fc99e Initial load
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parents:
diff changeset
632 // Check that we have a valid thread_state at this point
a61af66fc99e Initial load
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parents:
diff changeset
633 switch(state) {
a61af66fc99e Initial load
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parents:
diff changeset
634 case _thread_in_vm_trans:
a61af66fc99e Initial load
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parents:
diff changeset
635 case _thread_in_Java: // From compiled code
a61af66fc99e Initial load
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parents:
diff changeset
636
a61af66fc99e Initial load
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parents:
diff changeset
637 // We are highly likely to block on the Safepoint_lock. In order to avoid blocking in this case,
a61af66fc99e Initial load
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parents:
diff changeset
638 // we pretend we are still in the VM.
a61af66fc99e Initial load
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parents:
diff changeset
639 thread->set_thread_state(_thread_in_vm);
a61af66fc99e Initial load
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parents:
diff changeset
640
a61af66fc99e Initial load
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parents:
diff changeset
641 if (is_synchronizing()) {
a61af66fc99e Initial load
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parents:
diff changeset
642 Atomic::inc (&TryingToBlock) ;
a61af66fc99e Initial load
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parents:
diff changeset
643 }
a61af66fc99e Initial load
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parents:
diff changeset
644
a61af66fc99e Initial load
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parents:
diff changeset
645 // We will always be holding the Safepoint_lock when we are examine the state
a61af66fc99e Initial load
duke
parents:
diff changeset
646 // of a thread. Hence, the instructions between the Safepoint_lock->lock() and
a61af66fc99e Initial load
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parents:
diff changeset
647 // Safepoint_lock->unlock() are happening atomic with regards to the safepoint code
a61af66fc99e Initial load
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parents:
diff changeset
648 Safepoint_lock->lock_without_safepoint_check();
a61af66fc99e Initial load
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parents:
diff changeset
649 if (is_synchronizing()) {
a61af66fc99e Initial load
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parents:
diff changeset
650 // Decrement the number of threads to wait for and signal vm thread
a61af66fc99e Initial load
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parents:
diff changeset
651 assert(_waiting_to_block > 0, "sanity check");
a61af66fc99e Initial load
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parents:
diff changeset
652 _waiting_to_block--;
a61af66fc99e Initial load
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parents:
diff changeset
653 thread->safepoint_state()->set_has_called_back(true);
a61af66fc99e Initial load
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parents:
diff changeset
654
5928
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
655 DEBUG_ONLY(thread->set_visited_for_critical_count(true));
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
656 if (thread->in_critical()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
657 // Notice that this thread is in a critical section
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
658 increment_jni_active_count();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
659 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
660
0
a61af66fc99e Initial load
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parents:
diff changeset
661 // Consider (_waiting_to_block < 2) to pipeline the wakeup of the VM thread
a61af66fc99e Initial load
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parents:
diff changeset
662 if (_waiting_to_block == 0) {
a61af66fc99e Initial load
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parents:
diff changeset
663 Safepoint_lock->notify_all();
a61af66fc99e Initial load
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parents:
diff changeset
664 }
a61af66fc99e Initial load
duke
parents:
diff changeset
665 }
a61af66fc99e Initial load
duke
parents:
diff changeset
666
a61af66fc99e Initial load
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parents:
diff changeset
667 // We transition the thread to state _thread_blocked here, but
a61af66fc99e Initial load
duke
parents:
diff changeset
668 // we can't do our usual check for external suspension and then
a61af66fc99e Initial load
duke
parents:
diff changeset
669 // self-suspend after the lock_without_safepoint_check() call
a61af66fc99e Initial load
duke
parents:
diff changeset
670 // below because we are often called during transitions while
a61af66fc99e Initial load
duke
parents:
diff changeset
671 // we hold different locks. That would leave us suspended while
a61af66fc99e Initial load
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parents:
diff changeset
672 // holding a resource which results in deadlocks.
a61af66fc99e Initial load
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parents:
diff changeset
673 thread->set_thread_state(_thread_blocked);
a61af66fc99e Initial load
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parents:
diff changeset
674 Safepoint_lock->unlock();
a61af66fc99e Initial load
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parents:
diff changeset
675
a61af66fc99e Initial load
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parents:
diff changeset
676 // We now try to acquire the threads lock. Since this lock is hold by the VM thread during
a61af66fc99e Initial load
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parents:
diff changeset
677 // the entire safepoint, the threads will all line up here during the safepoint.
a61af66fc99e Initial load
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parents:
diff changeset
678 Threads_lock->lock_without_safepoint_check();
a61af66fc99e Initial load
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parents:
diff changeset
679 // restore original state. This is important if the thread comes from compiled code, so it
a61af66fc99e Initial load
duke
parents:
diff changeset
680 // will continue to execute with the _thread_in_Java state.
a61af66fc99e Initial load
duke
parents:
diff changeset
681 thread->set_thread_state(state);
a61af66fc99e Initial load
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parents:
diff changeset
682 Threads_lock->unlock();
a61af66fc99e Initial load
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parents:
diff changeset
683 break;
a61af66fc99e Initial load
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parents:
diff changeset
684
a61af66fc99e Initial load
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parents:
diff changeset
685 case _thread_in_native_trans:
a61af66fc99e Initial load
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parents:
diff changeset
686 case _thread_blocked_trans:
a61af66fc99e Initial load
duke
parents:
diff changeset
687 case _thread_new_trans:
a61af66fc99e Initial load
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parents:
diff changeset
688 if (thread->safepoint_state()->type() == ThreadSafepointState::_call_back) {
a61af66fc99e Initial load
duke
parents:
diff changeset
689 thread->print_thread_state();
a61af66fc99e Initial load
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parents:
diff changeset
690 fatal("Deadlock in safepoint code. "
a61af66fc99e Initial load
duke
parents:
diff changeset
691 "Should have called back to the VM before blocking.");
a61af66fc99e Initial load
duke
parents:
diff changeset
692 }
a61af66fc99e Initial load
duke
parents:
diff changeset
693
a61af66fc99e Initial load
duke
parents:
diff changeset
694 // We transition the thread to state _thread_blocked here, but
a61af66fc99e Initial load
duke
parents:
diff changeset
695 // we can't do our usual check for external suspension and then
a61af66fc99e Initial load
duke
parents:
diff changeset
696 // self-suspend after the lock_without_safepoint_check() call
a61af66fc99e Initial load
duke
parents:
diff changeset
697 // below because we are often called during transitions while
a61af66fc99e Initial load
duke
parents:
diff changeset
698 // we hold different locks. That would leave us suspended while
a61af66fc99e Initial load
duke
parents:
diff changeset
699 // holding a resource which results in deadlocks.
a61af66fc99e Initial load
duke
parents:
diff changeset
700 thread->set_thread_state(_thread_blocked);
a61af66fc99e Initial load
duke
parents:
diff changeset
701
a61af66fc99e Initial load
duke
parents:
diff changeset
702 // It is not safe to suspend a thread if we discover it is in _thread_in_native_trans. Hence,
a61af66fc99e Initial load
duke
parents:
diff changeset
703 // the safepoint code might still be waiting for it to block. We need to change the state here,
a61af66fc99e Initial load
duke
parents:
diff changeset
704 // so it can see that it is at a safepoint.
a61af66fc99e Initial load
duke
parents:
diff changeset
705
a61af66fc99e Initial load
duke
parents:
diff changeset
706 // Block until the safepoint operation is completed.
a61af66fc99e Initial load
duke
parents:
diff changeset
707 Threads_lock->lock_without_safepoint_check();
a61af66fc99e Initial load
duke
parents:
diff changeset
708
a61af66fc99e Initial load
duke
parents:
diff changeset
709 // Restore state
a61af66fc99e Initial load
duke
parents:
diff changeset
710 thread->set_thread_state(state);
a61af66fc99e Initial load
duke
parents:
diff changeset
711
a61af66fc99e Initial load
duke
parents:
diff changeset
712 Threads_lock->unlock();
a61af66fc99e Initial load
duke
parents:
diff changeset
713 break;
a61af66fc99e Initial load
duke
parents:
diff changeset
714
a61af66fc99e Initial load
duke
parents:
diff changeset
715 default:
1490
f03d0a26bf83 6888954: argument formatting for assert() and friends
jcoomes
parents: 1321
diff changeset
716 fatal(err_msg("Illegal threadstate encountered: %d", state));
0
a61af66fc99e Initial load
duke
parents:
diff changeset
717 }
a61af66fc99e Initial load
duke
parents:
diff changeset
718
a61af66fc99e Initial load
duke
parents:
diff changeset
719 // Check for pending. async. exceptions or suspends - except if the
a61af66fc99e Initial load
duke
parents:
diff changeset
720 // thread was blocked inside the VM. has_special_runtime_exit_condition()
a61af66fc99e Initial load
duke
parents:
diff changeset
721 // is called last since it grabs a lock and we only want to do that when
a61af66fc99e Initial load
duke
parents:
diff changeset
722 // we must.
a61af66fc99e Initial load
duke
parents:
diff changeset
723 //
a61af66fc99e Initial load
duke
parents:
diff changeset
724 // Note: we never deliver an async exception at a polling point as the
a61af66fc99e Initial load
duke
parents:
diff changeset
725 // compiler may not have an exception handler for it. The polling
a61af66fc99e Initial load
duke
parents:
diff changeset
726 // code will notice the async and deoptimize and the exception will
a61af66fc99e Initial load
duke
parents:
diff changeset
727 // be delivered. (Polling at a return point is ok though). Sure is
a61af66fc99e Initial load
duke
parents:
diff changeset
728 // a lot of bother for a deprecated feature...
a61af66fc99e Initial load
duke
parents:
diff changeset
729 //
a61af66fc99e Initial load
duke
parents:
diff changeset
730 // We don't deliver an async exception if the thread state is
a61af66fc99e Initial load
duke
parents:
diff changeset
731 // _thread_in_native_trans so JNI functions won't be called with
a61af66fc99e Initial load
duke
parents:
diff changeset
732 // a surprising pending exception. If the thread state is going back to java,
a61af66fc99e Initial load
duke
parents:
diff changeset
733 // async exception is checked in check_special_condition_for_native_trans().
a61af66fc99e Initial load
duke
parents:
diff changeset
734
a61af66fc99e Initial load
duke
parents:
diff changeset
735 if (state != _thread_blocked_trans &&
a61af66fc99e Initial load
duke
parents:
diff changeset
736 state != _thread_in_vm_trans &&
a61af66fc99e Initial load
duke
parents:
diff changeset
737 thread->has_special_runtime_exit_condition()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
738 thread->handle_special_runtime_exit_condition(
a61af66fc99e Initial load
duke
parents:
diff changeset
739 !thread->is_at_poll_safepoint() && (state != _thread_in_native_trans));
a61af66fc99e Initial load
duke
parents:
diff changeset
740 }
a61af66fc99e Initial load
duke
parents:
diff changeset
741 }
a61af66fc99e Initial load
duke
parents:
diff changeset
742
a61af66fc99e Initial load
duke
parents:
diff changeset
743 // ------------------------------------------------------------------------------------------------------
a61af66fc99e Initial load
duke
parents:
diff changeset
744 // Exception handlers
a61af66fc99e Initial load
duke
parents:
diff changeset
745
a61af66fc99e Initial load
duke
parents:
diff changeset
746 #ifndef PRODUCT
9060
cc32ccaaf47f 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 8001
diff changeset
747
cc32ccaaf47f 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 8001
diff changeset
748 #ifdef SPARC
cc32ccaaf47f 8003310: Enable -Wunused-function when compiling with gcc
mikael
parents: 8001
diff changeset
749
0
a61af66fc99e Initial load
duke
parents:
diff changeset
750 #ifdef _LP64
a61af66fc99e Initial load
duke
parents:
diff changeset
751 #define PTR_PAD ""
a61af66fc99e Initial load
duke
parents:
diff changeset
752 #else
a61af66fc99e Initial load
duke
parents:
diff changeset
753 #define PTR_PAD " "
a61af66fc99e Initial load
duke
parents:
diff changeset
754 #endif
a61af66fc99e Initial load
duke
parents:
diff changeset
755
a61af66fc99e Initial load
duke
parents:
diff changeset
756 static void print_ptrs(intptr_t oldptr, intptr_t newptr, bool wasoop) {
12316
190899198332 7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents: 9060
diff changeset
757 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
758 tty->print_cr(PTR_FORMAT PTR_PAD " %s %c " PTR_FORMAT PTR_PAD " %s %s",
a61af66fc99e Initial load
duke
parents:
diff changeset
759 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!',
a61af66fc99e Initial load
duke
parents:
diff changeset
760 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" "));
a61af66fc99e Initial load
duke
parents:
diff changeset
761 }
a61af66fc99e Initial load
duke
parents:
diff changeset
762
a61af66fc99e Initial load
duke
parents:
diff changeset
763 static void print_longs(jlong oldptr, jlong newptr, bool wasoop) {
12316
190899198332 7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents: 9060
diff changeset
764 bool is_oop = newptr ? (cast_to_oop(newptr))->is_oop() : false;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
765 tty->print_cr(PTR64_FORMAT " %s %c " PTR64_FORMAT " %s %s",
a61af66fc99e Initial load
duke
parents:
diff changeset
766 oldptr, wasoop?"oop":" ", oldptr == newptr ? ' ' : '!',
a61af66fc99e Initial load
duke
parents:
diff changeset
767 newptr, is_oop?"oop":" ", (wasoop && !is_oop) ? "STALE" : ((wasoop==false&&is_oop==false&&oldptr !=newptr)?"STOMP":" "));
a61af66fc99e Initial load
duke
parents:
diff changeset
768 }
a61af66fc99e Initial load
duke
parents:
diff changeset
769
a61af66fc99e Initial load
duke
parents:
diff changeset
770 static void print_me(intptr_t *new_sp, intptr_t *old_sp, bool *was_oops) {
a61af66fc99e Initial load
duke
parents:
diff changeset
771 #ifdef _LP64
a61af66fc99e Initial load
duke
parents:
diff changeset
772 tty->print_cr("--------+------address-----+------before-----------+-------after----------+");
a61af66fc99e Initial load
duke
parents:
diff changeset
773 const int incr = 1; // Increment to skip a long, in units of intptr_t
a61af66fc99e Initial load
duke
parents:
diff changeset
774 #else
a61af66fc99e Initial load
duke
parents:
diff changeset
775 tty->print_cr("--------+--address-+------before-----------+-------after----------+");
a61af66fc99e Initial load
duke
parents:
diff changeset
776 const int incr = 2; // Increment to skip a long, in units of intptr_t
a61af66fc99e Initial load
duke
parents:
diff changeset
777 #endif
a61af66fc99e Initial load
duke
parents:
diff changeset
778 tty->print_cr("---SP---|");
a61af66fc99e Initial load
duke
parents:
diff changeset
779 for( int i=0; i<16; i++ ) {
a61af66fc99e Initial load
duke
parents:
diff changeset
780 tty->print("blob %c%d |"PTR_FORMAT" ","LO"[i>>3],i&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
a61af66fc99e Initial load
duke
parents:
diff changeset
781 tty->print_cr("--------|");
a61af66fc99e Initial load
duke
parents:
diff changeset
782 for( int i1=0; i1<frame::memory_parameter_word_sp_offset-16; i1++ ) {
a61af66fc99e Initial load
duke
parents:
diff changeset
783 tty->print("argv pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
a61af66fc99e Initial load
duke
parents:
diff changeset
784 tty->print(" pad|"PTR_FORMAT" ",new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++);
a61af66fc99e Initial load
duke
parents:
diff changeset
785 tty->print_cr("--------|");
a61af66fc99e Initial load
duke
parents:
diff changeset
786 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;
a61af66fc99e Initial load
duke
parents:
diff changeset
787 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;
a61af66fc99e Initial load
duke
parents:
diff changeset
788 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;
a61af66fc99e Initial load
duke
parents:
diff changeset
789 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;
a61af66fc99e Initial load
duke
parents:
diff changeset
790 tty->print_cr(" FSR |"PTR_FORMAT" "PTR64_FORMAT" "PTR64_FORMAT,new_sp,*(jlong*)old_sp,*(jlong*)new_sp);
a61af66fc99e Initial load
duke
parents:
diff changeset
791 old_sp += incr; new_sp += incr; was_oops += incr;
a61af66fc99e Initial load
duke
parents:
diff changeset
792 // Skip the floats
a61af66fc99e Initial load
duke
parents:
diff changeset
793 tty->print_cr("--Float-|"PTR_FORMAT,new_sp);
a61af66fc99e Initial load
duke
parents:
diff changeset
794 tty->print_cr("---FP---|");
a61af66fc99e Initial load
duke
parents:
diff changeset
795 old_sp += incr*32; new_sp += incr*32; was_oops += incr*32;
a61af66fc99e Initial load
duke
parents:
diff changeset
796 for( int i2=0; i2<16; i2++ ) {
a61af66fc99e Initial load
duke
parents:
diff changeset
797 tty->print("call %c%d |"PTR_FORMAT" ","LI"[i2>>3],i2&7,new_sp); print_ptrs(*old_sp++,*new_sp++,*was_oops++); }
17937
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 17935
diff changeset
798 tty->cr();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
799 }
a61af66fc99e Initial load
duke
parents:
diff changeset
800 #endif // SPARC
a61af66fc99e Initial load
duke
parents:
diff changeset
801 #endif // PRODUCT
a61af66fc99e Initial load
duke
parents:
diff changeset
802
a61af66fc99e Initial load
duke
parents:
diff changeset
803
a61af66fc99e Initial load
duke
parents:
diff changeset
804 void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) {
a61af66fc99e Initial load
duke
parents:
diff changeset
805 assert(thread->is_Java_thread(), "polling reference encountered by VM thread");
a61af66fc99e Initial load
duke
parents:
diff changeset
806 assert(thread->thread_state() == _thread_in_Java, "should come from Java code");
a61af66fc99e Initial load
duke
parents:
diff changeset
807 assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization");
a61af66fc99e Initial load
duke
parents:
diff changeset
808
a61af66fc99e Initial load
duke
parents:
diff changeset
809 // Uncomment this to get some serious before/after printing of the
a61af66fc99e Initial load
duke
parents:
diff changeset
810 // Sparc safepoint-blob frame structure.
a61af66fc99e Initial load
duke
parents:
diff changeset
811 /*
a61af66fc99e Initial load
duke
parents:
diff changeset
812 intptr_t* sp = thread->last_Java_sp();
a61af66fc99e Initial load
duke
parents:
diff changeset
813 intptr_t stack_copy[150];
a61af66fc99e Initial load
duke
parents:
diff changeset
814 for( int i=0; i<150; i++ ) stack_copy[i] = sp[i];
a61af66fc99e Initial load
duke
parents:
diff changeset
815 bool was_oops[150];
a61af66fc99e Initial load
duke
parents:
diff changeset
816 for( int i=0; i<150; i++ )
a61af66fc99e Initial load
duke
parents:
diff changeset
817 was_oops[i] = stack_copy[i] ? ((oop)stack_copy[i])->is_oop() : false;
a61af66fc99e Initial load
duke
parents:
diff changeset
818 */
a61af66fc99e Initial load
duke
parents:
diff changeset
819
a61af66fc99e Initial load
duke
parents:
diff changeset
820 if (ShowSafepointMsgs) {
a61af66fc99e Initial load
duke
parents:
diff changeset
821 tty->print("handle_polling_page_exception: ");
a61af66fc99e Initial load
duke
parents:
diff changeset
822 }
a61af66fc99e Initial load
duke
parents:
diff changeset
823
a61af66fc99e Initial load
duke
parents:
diff changeset
824 if (PrintSafepointStatistics) {
a61af66fc99e Initial load
duke
parents:
diff changeset
825 inc_page_trap_count();
a61af66fc99e Initial load
duke
parents:
diff changeset
826 }
a61af66fc99e Initial load
duke
parents:
diff changeset
827
a61af66fc99e Initial load
duke
parents:
diff changeset
828 ThreadSafepointState* state = thread->safepoint_state();
a61af66fc99e Initial load
duke
parents:
diff changeset
829
a61af66fc99e Initial load
duke
parents:
diff changeset
830 state->handle_polling_page_exception();
a61af66fc99e Initial load
duke
parents:
diff changeset
831 // print_me(sp,stack_copy,was_oops);
a61af66fc99e Initial load
duke
parents:
diff changeset
832 }
a61af66fc99e Initial load
duke
parents:
diff changeset
833
a61af66fc99e Initial load
duke
parents:
diff changeset
834
a61af66fc99e Initial load
duke
parents:
diff changeset
835 void SafepointSynchronize::print_safepoint_timeout(SafepointTimeoutReason reason) {
a61af66fc99e Initial load
duke
parents:
diff changeset
836 if (!timeout_error_printed) {
a61af66fc99e Initial load
duke
parents:
diff changeset
837 timeout_error_printed = true;
a61af66fc99e Initial load
duke
parents:
diff changeset
838 // Print out the thread infor which didn't reach the safepoint for debugging
a61af66fc99e Initial load
duke
parents:
diff changeset
839 // purposes (useful when there are lots of threads in the debugger).
17937
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 17935
diff changeset
840 tty->cr();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
841 tty->print_cr("# SafepointSynchronize::begin: Timeout detected:");
a61af66fc99e Initial load
duke
parents:
diff changeset
842 if (reason == _spinning_timeout) {
a61af66fc99e Initial load
duke
parents:
diff changeset
843 tty->print_cr("# SafepointSynchronize::begin: Timed out while spinning to reach a safepoint.");
a61af66fc99e Initial load
duke
parents:
diff changeset
844 } else if (reason == _blocking_timeout) {
a61af66fc99e Initial load
duke
parents:
diff changeset
845 tty->print_cr("# SafepointSynchronize::begin: Timed out while waiting for threads to stop.");
a61af66fc99e Initial load
duke
parents:
diff changeset
846 }
a61af66fc99e Initial load
duke
parents:
diff changeset
847
a61af66fc99e Initial load
duke
parents:
diff changeset
848 tty->print_cr("# SafepointSynchronize::begin: Threads which did not reach the safepoint:");
a61af66fc99e Initial load
duke
parents:
diff changeset
849 ThreadSafepointState *cur_state;
a61af66fc99e Initial load
duke
parents:
diff changeset
850 ResourceMark rm;
a61af66fc99e Initial load
duke
parents:
diff changeset
851 for(JavaThread *cur_thread = Threads::first(); cur_thread;
a61af66fc99e Initial load
duke
parents:
diff changeset
852 cur_thread = cur_thread->next()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
853 cur_state = cur_thread->safepoint_state();
a61af66fc99e Initial load
duke
parents:
diff changeset
854
a61af66fc99e Initial load
duke
parents:
diff changeset
855 if (cur_thread->thread_state() != _thread_blocked &&
a61af66fc99e Initial load
duke
parents:
diff changeset
856 ((reason == _spinning_timeout && cur_state->is_running()) ||
a61af66fc99e Initial load
duke
parents:
diff changeset
857 (reason == _blocking_timeout && !cur_state->has_called_back()))) {
a61af66fc99e Initial load
duke
parents:
diff changeset
858 tty->print("# ");
a61af66fc99e Initial load
duke
parents:
diff changeset
859 cur_thread->print();
17937
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 17935
diff changeset
860 tty->cr();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
861 }
a61af66fc99e Initial load
duke
parents:
diff changeset
862 }
a61af66fc99e Initial load
duke
parents:
diff changeset
863 tty->print_cr("# SafepointSynchronize::begin: (End of list)");
a61af66fc99e Initial load
duke
parents:
diff changeset
864 }
a61af66fc99e Initial load
duke
parents:
diff changeset
865
a61af66fc99e Initial load
duke
parents:
diff changeset
866 // To debug the long safepoint, specify both DieOnSafepointTimeout &
a61af66fc99e Initial load
duke
parents:
diff changeset
867 // ShowMessageBoxOnError.
a61af66fc99e Initial load
duke
parents:
diff changeset
868 if (DieOnSafepointTimeout) {
a61af66fc99e Initial load
duke
parents:
diff changeset
869 char msg[1024];
a61af66fc99e Initial load
duke
parents:
diff changeset
870 VM_Operation *op = VMThread::vm_operation();
513
2328d1d3f8cf 6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents: 0
diff changeset
871 sprintf(msg, "Safepoint sync time longer than " INTX_FORMAT "ms detected when executing %s.",
0
a61af66fc99e Initial load
duke
parents:
diff changeset
872 SafepointTimeoutDelay,
a61af66fc99e Initial load
duke
parents:
diff changeset
873 op != NULL ? op->name() : "no vm operation");
a61af66fc99e Initial load
duke
parents:
diff changeset
874 fatal(msg);
a61af66fc99e Initial load
duke
parents:
diff changeset
875 }
a61af66fc99e Initial load
duke
parents:
diff changeset
876 }
a61af66fc99e Initial load
duke
parents:
diff changeset
877
a61af66fc99e Initial load
duke
parents:
diff changeset
878
a61af66fc99e Initial load
duke
parents:
diff changeset
879 // -------------------------------------------------------------------------------------------------------
a61af66fc99e Initial load
duke
parents:
diff changeset
880 // Implementation of ThreadSafepointState
a61af66fc99e Initial load
duke
parents:
diff changeset
881
a61af66fc99e Initial load
duke
parents:
diff changeset
882 ThreadSafepointState::ThreadSafepointState(JavaThread *thread) {
a61af66fc99e Initial load
duke
parents:
diff changeset
883 _thread = thread;
a61af66fc99e Initial load
duke
parents:
diff changeset
884 _type = _running;
a61af66fc99e Initial load
duke
parents:
diff changeset
885 _has_called_back = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
886 _at_poll_safepoint = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
887 }
a61af66fc99e Initial load
duke
parents:
diff changeset
888
a61af66fc99e Initial load
duke
parents:
diff changeset
889 void ThreadSafepointState::create(JavaThread *thread) {
a61af66fc99e Initial load
duke
parents:
diff changeset
890 ThreadSafepointState *state = new ThreadSafepointState(thread);
a61af66fc99e Initial load
duke
parents:
diff changeset
891 thread->set_safepoint_state(state);
a61af66fc99e Initial load
duke
parents:
diff changeset
892 }
a61af66fc99e Initial load
duke
parents:
diff changeset
893
a61af66fc99e Initial load
duke
parents:
diff changeset
894 void ThreadSafepointState::destroy(JavaThread *thread) {
a61af66fc99e Initial load
duke
parents:
diff changeset
895 if (thread->safepoint_state()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
896 delete(thread->safepoint_state());
a61af66fc99e Initial load
duke
parents:
diff changeset
897 thread->set_safepoint_state(NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
898 }
a61af66fc99e Initial load
duke
parents:
diff changeset
899 }
a61af66fc99e Initial load
duke
parents:
diff changeset
900
a61af66fc99e Initial load
duke
parents:
diff changeset
901 void ThreadSafepointState::examine_state_of_thread() {
a61af66fc99e Initial load
duke
parents:
diff changeset
902 assert(is_running(), "better be running or just have hit safepoint poll");
a61af66fc99e Initial load
duke
parents:
diff changeset
903
a61af66fc99e Initial load
duke
parents:
diff changeset
904 JavaThreadState state = _thread->thread_state();
a61af66fc99e Initial load
duke
parents:
diff changeset
905
1727
da877bdc9000 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 1552
diff changeset
906 // Save the state at the start of safepoint processing.
da877bdc9000 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 1552
diff changeset
907 _orig_thread_state = state;
da877bdc9000 6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents: 1552
diff changeset
908
0
a61af66fc99e Initial load
duke
parents:
diff changeset
909 // Check for a thread that is suspended. Note that thread resume tries
a61af66fc99e Initial load
duke
parents:
diff changeset
910 // to grab the Threads_lock which we own here, so a thread cannot be
a61af66fc99e Initial load
duke
parents:
diff changeset
911 // resumed during safepoint synchronization.
a61af66fc99e Initial load
duke
parents:
diff changeset
912
979
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
913 // We check to see if this thread is suspended without locking to
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
914 // avoid deadlocking with a third thread that is waiting for this
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
915 // thread to be suspended. The third thread can notice the safepoint
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
916 // that we're trying to start at the beginning of its SR_lock->wait()
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
917 // call. If that happens, then the third thread will block on the
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
918 // safepoint while still holding the underlying SR_lock. We won't be
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
919 // able to get the SR_lock and we'll deadlock.
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
920 //
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
921 // We don't need to grab the SR_lock here for two reasons:
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
922 // 1) The suspend flags are both volatile and are set with an
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
923 // Atomic::cmpxchg() call so we should see the suspended
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
924 // state right away.
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
925 // 2) We're being called from the safepoint polling loop; if
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
926 // we don't see the suspended state on this iteration, then
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
927 // we'll come around again.
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
928 //
87770dcf831b 6876794: 4/4 sp07t002 hangs very intermittently
dcubed
parents: 845
diff changeset
929 bool is_suspended = _thread->is_ext_suspended();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
930 if (is_suspended) {
a61af66fc99e Initial load
duke
parents:
diff changeset
931 roll_forward(_at_safepoint);
a61af66fc99e Initial load
duke
parents:
diff changeset
932 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
933 }
a61af66fc99e Initial load
duke
parents:
diff changeset
934
a61af66fc99e Initial load
duke
parents:
diff changeset
935 // Some JavaThread states have an initial safepoint state of
a61af66fc99e Initial load
duke
parents:
diff changeset
936 // running, but are actually at a safepoint. We will happily
a61af66fc99e Initial load
duke
parents:
diff changeset
937 // agree and update the safepoint state here.
a61af66fc99e Initial load
duke
parents:
diff changeset
938 if (SafepointSynchronize::safepoint_safe(_thread, state)) {
5928
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
939 SafepointSynchronize::check_for_lazy_critical_native(_thread, state);
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
940 roll_forward(_at_safepoint);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 3960
diff changeset
941 return;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
942 }
a61af66fc99e Initial load
duke
parents:
diff changeset
943
a61af66fc99e Initial load
duke
parents:
diff changeset
944 if (state == _thread_in_vm) {
a61af66fc99e Initial load
duke
parents:
diff changeset
945 roll_forward(_call_back);
a61af66fc99e Initial load
duke
parents:
diff changeset
946 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
947 }
a61af66fc99e Initial load
duke
parents:
diff changeset
948
a61af66fc99e Initial load
duke
parents:
diff changeset
949 // All other thread states will continue to run until they
a61af66fc99e Initial load
duke
parents:
diff changeset
950 // transition and self-block in state _blocked
a61af66fc99e Initial load
duke
parents:
diff changeset
951 // Safepoint polling in compiled code causes the Java threads to do the same.
a61af66fc99e Initial load
duke
parents:
diff changeset
952 // Note: new threads may require a malloc so they must be allowed to finish
a61af66fc99e Initial load
duke
parents:
diff changeset
953
a61af66fc99e Initial load
duke
parents:
diff changeset
954 assert(is_running(), "examine_state_of_thread on non-running thread");
a61af66fc99e Initial load
duke
parents:
diff changeset
955 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
956 }
a61af66fc99e Initial load
duke
parents:
diff changeset
957
a61af66fc99e Initial load
duke
parents:
diff changeset
958 // Returns true is thread could not be rolled forward at present position.
a61af66fc99e Initial load
duke
parents:
diff changeset
959 void ThreadSafepointState::roll_forward(suspend_type type) {
a61af66fc99e Initial load
duke
parents:
diff changeset
960 _type = type;
a61af66fc99e Initial load
duke
parents:
diff changeset
961
a61af66fc99e Initial load
duke
parents:
diff changeset
962 switch(_type) {
a61af66fc99e Initial load
duke
parents:
diff changeset
963 case _at_safepoint:
a61af66fc99e Initial load
duke
parents:
diff changeset
964 SafepointSynchronize::signal_thread_at_safepoint();
5928
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
965 DEBUG_ONLY(_thread->set_visited_for_critical_count(true));
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
966 if (_thread->in_critical()) {
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
967 // Notice that this thread is in a critical section
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
968 SafepointSynchronize::increment_jni_active_count();
541c4a5e7b88 7150390: JFR test crashed on assert(_jni_lock_count == count) failed: must be equal
never
parents: 4873
diff changeset
969 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
970 break;
a61af66fc99e Initial load
duke
parents:
diff changeset
971
a61af66fc99e Initial load
duke
parents:
diff changeset
972 case _call_back:
a61af66fc99e Initial load
duke
parents:
diff changeset
973 set_has_called_back(false);
a61af66fc99e Initial load
duke
parents:
diff changeset
974 break;
a61af66fc99e Initial load
duke
parents:
diff changeset
975
a61af66fc99e Initial load
duke
parents:
diff changeset
976 case _running:
a61af66fc99e Initial load
duke
parents:
diff changeset
977 default:
a61af66fc99e Initial load
duke
parents:
diff changeset
978 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
979 }
a61af66fc99e Initial load
duke
parents:
diff changeset
980 }
a61af66fc99e Initial load
duke
parents:
diff changeset
981
a61af66fc99e Initial load
duke
parents:
diff changeset
982 void ThreadSafepointState::restart() {
a61af66fc99e Initial load
duke
parents:
diff changeset
983 switch(type()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
984 case _at_safepoint:
a61af66fc99e Initial load
duke
parents:
diff changeset
985 case _call_back:
a61af66fc99e Initial load
duke
parents:
diff changeset
986 break;
a61af66fc99e Initial load
duke
parents:
diff changeset
987
a61af66fc99e Initial load
duke
parents:
diff changeset
988 case _running:
a61af66fc99e Initial load
duke
parents:
diff changeset
989 default:
a61af66fc99e Initial load
duke
parents:
diff changeset
990 tty->print_cr("restart thread "INTPTR_FORMAT" with state %d",
a61af66fc99e Initial load
duke
parents:
diff changeset
991 _thread, _type);
a61af66fc99e Initial load
duke
parents:
diff changeset
992 _thread->print();
a61af66fc99e Initial load
duke
parents:
diff changeset
993 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
994 }
a61af66fc99e Initial load
duke
parents:
diff changeset
995 _type = _running;
a61af66fc99e Initial load
duke
parents:
diff changeset
996 set_has_called_back(false);
a61af66fc99e Initial load
duke
parents:
diff changeset
997 }
a61af66fc99e Initial load
duke
parents:
diff changeset
998
a61af66fc99e Initial load
duke
parents:
diff changeset
999
a61af66fc99e Initial load
duke
parents:
diff changeset
1000 void ThreadSafepointState::print_on(outputStream *st) const {
a61af66fc99e Initial load
duke
parents:
diff changeset
1001 const char *s;
a61af66fc99e Initial load
duke
parents:
diff changeset
1002
a61af66fc99e Initial load
duke
parents:
diff changeset
1003 switch(_type) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1004 case _running : s = "_running"; break;
a61af66fc99e Initial load
duke
parents:
diff changeset
1005 case _at_safepoint : s = "_at_safepoint"; break;
a61af66fc99e Initial load
duke
parents:
diff changeset
1006 case _call_back : s = "_call_back"; break;
a61af66fc99e Initial load
duke
parents:
diff changeset
1007 default:
a61af66fc99e Initial load
duke
parents:
diff changeset
1008 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
1009 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1010
a61af66fc99e Initial load
duke
parents:
diff changeset
1011 st->print_cr("Thread: " INTPTR_FORMAT
a61af66fc99e Initial load
duke
parents:
diff changeset
1012 " [0x%2x] State: %s _has_called_back %d _at_poll_safepoint %d",
a61af66fc99e Initial load
duke
parents:
diff changeset
1013 _thread, _thread->osthread()->thread_id(), s, _has_called_back,
a61af66fc99e Initial load
duke
parents:
diff changeset
1014 _at_poll_safepoint);
a61af66fc99e Initial load
duke
parents:
diff changeset
1015
a61af66fc99e Initial load
duke
parents:
diff changeset
1016 _thread->print_thread_state_on(st);
a61af66fc99e Initial load
duke
parents:
diff changeset
1017 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1018
a61af66fc99e Initial load
duke
parents:
diff changeset
1019
a61af66fc99e Initial load
duke
parents:
diff changeset
1020 // ---------------------------------------------------------------------------------------------------------------------
a61af66fc99e Initial load
duke
parents:
diff changeset
1021
a61af66fc99e Initial load
duke
parents:
diff changeset
1022 // Block the thread at the safepoint poll or poll return.
a61af66fc99e Initial load
duke
parents:
diff changeset
1023 void ThreadSafepointState::handle_polling_page_exception() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1024
a61af66fc99e Initial load
duke
parents:
diff changeset
1025 // Check state. block() will set thread state to thread_in_vm which will
a61af66fc99e Initial load
duke
parents:
diff changeset
1026 // cause the safepoint state _type to become _call_back.
a61af66fc99e Initial load
duke
parents:
diff changeset
1027 assert(type() == ThreadSafepointState::_running,
a61af66fc99e Initial load
duke
parents:
diff changeset
1028 "polling page exception on thread not running state");
a61af66fc99e Initial load
duke
parents:
diff changeset
1029
a61af66fc99e Initial load
duke
parents:
diff changeset
1030 // Step 1: Find the nmethod from the return address
a61af66fc99e Initial load
duke
parents:
diff changeset
1031 if (ShowSafepointMsgs && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1032 tty->print_cr("Polling page exception at " INTPTR_FORMAT, thread()->saved_exception_pc());
a61af66fc99e Initial load
duke
parents:
diff changeset
1033 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1034 address real_return_addr = thread()->saved_exception_pc();
a61af66fc99e Initial load
duke
parents:
diff changeset
1035
a61af66fc99e Initial load
duke
parents:
diff changeset
1036 CodeBlob *cb = CodeCache::find_blob(real_return_addr);
a61af66fc99e Initial load
duke
parents:
diff changeset
1037 assert(cb != NULL && cb->is_nmethod(), "return address should be in nmethod");
a61af66fc99e Initial load
duke
parents:
diff changeset
1038 nmethod* nm = (nmethod*)cb;
a61af66fc99e Initial load
duke
parents:
diff changeset
1039
a61af66fc99e Initial load
duke
parents:
diff changeset
1040 // Find frame of caller
a61af66fc99e Initial load
duke
parents:
diff changeset
1041 frame stub_fr = thread()->last_frame();
a61af66fc99e Initial load
duke
parents:
diff changeset
1042 CodeBlob* stub_cb = stub_fr.cb();
a61af66fc99e Initial load
duke
parents:
diff changeset
1043 assert(stub_cb->is_safepoint_stub(), "must be a safepoint stub");
a61af66fc99e Initial load
duke
parents:
diff changeset
1044 RegisterMap map(thread(), true);
a61af66fc99e Initial load
duke
parents:
diff changeset
1045 frame caller_fr = stub_fr.sender(&map);
a61af66fc99e Initial load
duke
parents:
diff changeset
1046
a61af66fc99e Initial load
duke
parents:
diff changeset
1047 // Should only be poll_return or poll
a61af66fc99e Initial load
duke
parents:
diff changeset
1048 assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" );
a61af66fc99e Initial load
duke
parents:
diff changeset
1049
a61af66fc99e Initial load
duke
parents:
diff changeset
1050 // This is a poll immediately before a return. The exception handling code
a61af66fc99e Initial load
duke
parents:
diff changeset
1051 // has already had the effect of causing the return to occur, so the execution
a61af66fc99e Initial load
duke
parents:
diff changeset
1052 // will continue immediately after the call. In addition, the oopmap at the
a61af66fc99e Initial load
duke
parents:
diff changeset
1053 // return point does not mark the return value as an oop (if it is), so
a61af66fc99e Initial load
duke
parents:
diff changeset
1054 // it needs a handle here to be updated.
a61af66fc99e Initial load
duke
parents:
diff changeset
1055 if( nm->is_at_poll_return(real_return_addr) ) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1056 // See if return type is an oop.
a61af66fc99e Initial load
duke
parents:
diff changeset
1057 bool return_oop = nm->method()->is_returning_oop();
a61af66fc99e Initial load
duke
parents:
diff changeset
1058 Handle return_value;
a61af66fc99e Initial load
duke
parents:
diff changeset
1059 if (return_oop) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1060 // The oop result has been saved on the stack together with all
a61af66fc99e Initial load
duke
parents:
diff changeset
1061 // the other registers. In order to preserve it over GCs we need
a61af66fc99e Initial load
duke
parents:
diff changeset
1062 // to keep it in a handle.
a61af66fc99e Initial load
duke
parents:
diff changeset
1063 oop result = caller_fr.saved_oop_result(&map);
a61af66fc99e Initial load
duke
parents:
diff changeset
1064 assert(result == NULL || result->is_oop(), "must be oop");
a61af66fc99e Initial load
duke
parents:
diff changeset
1065 return_value = Handle(thread(), result);
a61af66fc99e Initial load
duke
parents:
diff changeset
1066 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer");
a61af66fc99e Initial load
duke
parents:
diff changeset
1067 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1068
a61af66fc99e Initial load
duke
parents:
diff changeset
1069 // Block the thread
a61af66fc99e Initial load
duke
parents:
diff changeset
1070 SafepointSynchronize::block(thread());
a61af66fc99e Initial load
duke
parents:
diff changeset
1071
a61af66fc99e Initial load
duke
parents:
diff changeset
1072 // restore oop result, if any
a61af66fc99e Initial load
duke
parents:
diff changeset
1073 if (return_oop) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1074 caller_fr.set_saved_oop_result(&map, return_value());
a61af66fc99e Initial load
duke
parents:
diff changeset
1075 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1076 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1077
a61af66fc99e Initial load
duke
parents:
diff changeset
1078 // This is a safepoint poll. Verify the return address and block.
a61af66fc99e Initial load
duke
parents:
diff changeset
1079 else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1080 set_at_poll_safepoint(true);
a61af66fc99e Initial load
duke
parents:
diff changeset
1081
a61af66fc99e Initial load
duke
parents:
diff changeset
1082 // verify the blob built the "return address" correctly
a61af66fc99e Initial load
duke
parents:
diff changeset
1083 assert(real_return_addr == caller_fr.pc(), "must match");
a61af66fc99e Initial load
duke
parents:
diff changeset
1084
a61af66fc99e Initial load
duke
parents:
diff changeset
1085 // Block the thread
a61af66fc99e Initial load
duke
parents:
diff changeset
1086 SafepointSynchronize::block(thread());
a61af66fc99e Initial load
duke
parents:
diff changeset
1087 set_at_poll_safepoint(false);
a61af66fc99e Initial load
duke
parents:
diff changeset
1088
a61af66fc99e Initial load
duke
parents:
diff changeset
1089 // If we have a pending async exception deoptimize the frame
a61af66fc99e Initial load
duke
parents:
diff changeset
1090 // as otherwise we may never deliver it.
a61af66fc99e Initial load
duke
parents:
diff changeset
1091 if (thread()->has_async_condition()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1092 ThreadInVMfromJavaNoAsyncException __tiv(thread());
1905
ce6848d0666d 6968367: can_post_on_exceptions is still using VM_DeoptimizeFrame in some places
never
parents: 1783
diff changeset
1093 Deoptimization::deoptimize_frame(thread(), caller_fr.id());
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1094 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1095
a61af66fc99e Initial load
duke
parents:
diff changeset
1096 // If an exception has been installed we must check for a pending deoptimization
a61af66fc99e Initial load
duke
parents:
diff changeset
1097 // Deoptimize frame if exception has been thrown.
a61af66fc99e Initial load
duke
parents:
diff changeset
1098
a61af66fc99e Initial load
duke
parents:
diff changeset
1099 if (thread()->has_pending_exception() ) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1100 RegisterMap map(thread(), true);
a61af66fc99e Initial load
duke
parents:
diff changeset
1101 frame caller_fr = stub_fr.sender(&map);
a61af66fc99e Initial load
duke
parents:
diff changeset
1102 if (caller_fr.is_deoptimized_frame()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1103 // The exception patch will destroy registers that are still
a61af66fc99e Initial load
duke
parents:
diff changeset
1104 // live and will be needed during deoptimization. Defer the
a61af66fc99e Initial load
duke
parents:
diff changeset
1105 // Async exception should have defered the exception until the
a61af66fc99e Initial load
duke
parents:
diff changeset
1106 // next safepoint which will be detected when we get into
a61af66fc99e Initial load
duke
parents:
diff changeset
1107 // the interpreter so if we have an exception now things
a61af66fc99e Initial load
duke
parents:
diff changeset
1108 // are messed up.
a61af66fc99e Initial load
duke
parents:
diff changeset
1109
a61af66fc99e Initial load
duke
parents:
diff changeset
1110 fatal("Exception installed and deoptimization is pending");
a61af66fc99e Initial load
duke
parents:
diff changeset
1111 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1112 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1113 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1114 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1115
a61af66fc99e Initial load
duke
parents:
diff changeset
1116
a61af66fc99e Initial load
duke
parents:
diff changeset
1117 //
a61af66fc99e Initial load
duke
parents:
diff changeset
1118 // Statistics & Instrumentations
a61af66fc99e Initial load
duke
parents:
diff changeset
1119 //
a61af66fc99e Initial load
duke
parents:
diff changeset
1120 SafepointSynchronize::SafepointStats* SafepointSynchronize::_safepoint_stats = NULL;
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1121 jlong SafepointSynchronize::_safepoint_begin_time = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1122 int SafepointSynchronize::_cur_stat_index = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
1123 julong SafepointSynchronize::_safepoint_reasons[VM_Operation::VMOp_Terminating];
a61af66fc99e Initial load
duke
parents:
diff changeset
1124 julong SafepointSynchronize::_coalesced_vmop_count = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
1125 jlong SafepointSynchronize::_max_sync_time = 0;
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1126 jlong SafepointSynchronize::_max_vmop_time = 0;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1127 float SafepointSynchronize::_ts_of_current_safepoint = 0.0f;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1128
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1129 static jlong cleanup_end_time = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1130 static bool need_to_track_page_armed_status = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
1131 static bool init_done = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
1132
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1133 // Helper method to print the header.
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1134 static void print_header() {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1135 tty->print(" vmop "
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1136 "[threads: total initially_running wait_to_block] ");
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1137 tty->print("[time: spin block sync cleanup vmop] ");
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1138
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1139 // no page armed status printed out if it is always armed.
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1140 if (need_to_track_page_armed_status) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1141 tty->print("page_armed ");
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1142 }
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1143
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1144 tty->print_cr("page_trap_count");
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1145 }
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1146
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1147 void SafepointSynchronize::deferred_initialize_stat() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1148 if (init_done) return;
a61af66fc99e Initial load
duke
parents:
diff changeset
1149
a61af66fc99e Initial load
duke
parents:
diff changeset
1150 if (PrintSafepointStatisticsCount <= 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1151 fatal("Wrong PrintSafepointStatisticsCount");
a61af66fc99e Initial load
duke
parents:
diff changeset
1152 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1153
a61af66fc99e Initial load
duke
parents:
diff changeset
1154 // If PrintSafepointStatisticsTimeout is specified, the statistics data will
a61af66fc99e Initial load
duke
parents:
diff changeset
1155 // be printed right away, in which case, _safepoint_stats will regress to
a61af66fc99e Initial load
duke
parents:
diff changeset
1156 // a single element array. Otherwise, it is a circular ring buffer with default
a61af66fc99e Initial load
duke
parents:
diff changeset
1157 // size of PrintSafepointStatisticsCount.
a61af66fc99e Initial load
duke
parents:
diff changeset
1158 int stats_array_size;
a61af66fc99e Initial load
duke
parents:
diff changeset
1159 if (PrintSafepointStatisticsTimeout > 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1160 stats_array_size = 1;
a61af66fc99e Initial load
duke
parents:
diff changeset
1161 PrintSafepointStatistics = true;
a61af66fc99e Initial load
duke
parents:
diff changeset
1162 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1163 stats_array_size = PrintSafepointStatisticsCount;
a61af66fc99e Initial load
duke
parents:
diff changeset
1164 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1165 _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 6162
diff changeset
1166 * sizeof(SafepointStats), mtInternal);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1167 guarantee(_safepoint_stats != NULL,
a61af66fc99e Initial load
duke
parents:
diff changeset
1168 "not enough memory for safepoint instrumentation data");
a61af66fc99e Initial load
duke
parents:
diff changeset
1169
a61af66fc99e Initial load
duke
parents:
diff changeset
1170 if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1171 need_to_track_page_armed_status = true;
a61af66fc99e Initial load
duke
parents:
diff changeset
1172 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1173 init_done = true;
a61af66fc99e Initial load
duke
parents:
diff changeset
1174 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1175
a61af66fc99e Initial load
duke
parents:
diff changeset
1176 void SafepointSynchronize::begin_statistics(int nof_threads, int nof_running) {
1003
528d98fe1037 6880029: JDK 1.6.0_u14p Application crashed very early
xlu
parents: 979
diff changeset
1177 assert(init_done, "safepoint statistics array hasn't been initialized");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1178 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
a61af66fc99e Initial load
duke
parents:
diff changeset
1179
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1180 spstat->_time_stamp = _ts_of_current_safepoint;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1181
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1182 VM_Operation *op = VMThread::vm_operation();
a61af66fc99e Initial load
duke
parents:
diff changeset
1183 spstat->_vmop_type = (op != NULL ? op->type() : -1);
a61af66fc99e Initial load
duke
parents:
diff changeset
1184 if (op != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1185 _safepoint_reasons[spstat->_vmop_type]++;
a61af66fc99e Initial load
duke
parents:
diff changeset
1186 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1187
a61af66fc99e Initial load
duke
parents:
diff changeset
1188 spstat->_nof_total_threads = nof_threads;
a61af66fc99e Initial load
duke
parents:
diff changeset
1189 spstat->_nof_initial_running_threads = nof_running;
a61af66fc99e Initial load
duke
parents:
diff changeset
1190 spstat->_nof_threads_hit_page_trap = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
1191
a61af66fc99e Initial load
duke
parents:
diff changeset
1192 // Records the start time of spinning. The real time spent on spinning
a61af66fc99e Initial load
duke
parents:
diff changeset
1193 // will be adjusted when spin is done. Same trick is applied for time
a61af66fc99e Initial load
duke
parents:
diff changeset
1194 // spent on waiting for threads to block.
a61af66fc99e Initial load
duke
parents:
diff changeset
1195 if (nof_running != 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1196 spstat->_time_to_spin = os::javaTimeNanos();
a61af66fc99e Initial load
duke
parents:
diff changeset
1197 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1198 spstat->_time_to_spin = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
1199 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1200 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1201
a61af66fc99e Initial load
duke
parents:
diff changeset
1202 void SafepointSynchronize::update_statistics_on_spin_end() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1203 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
a61af66fc99e Initial load
duke
parents:
diff changeset
1204
a61af66fc99e Initial load
duke
parents:
diff changeset
1205 jlong cur_time = os::javaTimeNanos();
a61af66fc99e Initial load
duke
parents:
diff changeset
1206
a61af66fc99e Initial load
duke
parents:
diff changeset
1207 spstat->_nof_threads_wait_to_block = _waiting_to_block;
a61af66fc99e Initial load
duke
parents:
diff changeset
1208 if (spstat->_nof_initial_running_threads != 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1209 spstat->_time_to_spin = cur_time - spstat->_time_to_spin;
a61af66fc99e Initial load
duke
parents:
diff changeset
1210 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1211
a61af66fc99e Initial load
duke
parents:
diff changeset
1212 if (need_to_track_page_armed_status) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1213 spstat->_page_armed = (PageArmed == 1);
a61af66fc99e Initial load
duke
parents:
diff changeset
1214 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1215
a61af66fc99e Initial load
duke
parents:
diff changeset
1216 // Records the start time of waiting for to block. Updated when block is done.
a61af66fc99e Initial load
duke
parents:
diff changeset
1217 if (_waiting_to_block != 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1218 spstat->_time_to_wait_to_block = cur_time;
a61af66fc99e Initial load
duke
parents:
diff changeset
1219 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1220 spstat->_time_to_wait_to_block = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
1221 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1222 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1223
a61af66fc99e Initial load
duke
parents:
diff changeset
1224 void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1225 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
a61af66fc99e Initial load
duke
parents:
diff changeset
1226
a61af66fc99e Initial load
duke
parents:
diff changeset
1227 if (spstat->_nof_threads_wait_to_block != 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1228 spstat->_time_to_wait_to_block = end_time -
a61af66fc99e Initial load
duke
parents:
diff changeset
1229 spstat->_time_to_wait_to_block;
a61af66fc99e Initial load
duke
parents:
diff changeset
1230 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1231
a61af66fc99e Initial load
duke
parents:
diff changeset
1232 // Records the end time of sync which will be used to calculate the total
a61af66fc99e Initial load
duke
parents:
diff changeset
1233 // vm operation time. Again, the real time spending in syncing will be deducted
a61af66fc99e Initial load
duke
parents:
diff changeset
1234 // from the start of the sync time later when end_statistics is called.
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1235 spstat->_time_to_sync = end_time - _safepoint_begin_time;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1236 if (spstat->_time_to_sync > _max_sync_time) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1237 _max_sync_time = spstat->_time_to_sync;
a61af66fc99e Initial load
duke
parents:
diff changeset
1238 }
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1239
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1240 spstat->_time_to_do_cleanups = end_time;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1241 }
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1242
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1243 void SafepointSynchronize::update_statistics_on_cleanup_end(jlong end_time) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1244 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1245
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1246 // Record how long spent in cleanup tasks.
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1247 spstat->_time_to_do_cleanups = end_time - spstat->_time_to_do_cleanups;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1248
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1249 cleanup_end_time = end_time;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1250 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1251
a61af66fc99e Initial load
duke
parents:
diff changeset
1252 void SafepointSynchronize::end_statistics(jlong vmop_end_time) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1253 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
a61af66fc99e Initial load
duke
parents:
diff changeset
1254
a61af66fc99e Initial load
duke
parents:
diff changeset
1255 // Update the vm operation time.
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1256 spstat->_time_to_exec_vmop = vmop_end_time - cleanup_end_time;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1257 if (spstat->_time_to_exec_vmop > _max_vmop_time) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1258 _max_vmop_time = spstat->_time_to_exec_vmop;
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1259 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1260 // Only the sync time longer than the specified
a61af66fc99e Initial load
duke
parents:
diff changeset
1261 // PrintSafepointStatisticsTimeout will be printed out right away.
a61af66fc99e Initial load
duke
parents:
diff changeset
1262 // By default, it is -1 meaning all samples will be put into the list.
a61af66fc99e Initial load
duke
parents:
diff changeset
1263 if ( PrintSafepointStatisticsTimeout > 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1264 if (spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1265 print_statistics();
a61af66fc99e Initial load
duke
parents:
diff changeset
1266 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1267 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1268 // The safepoint statistics will be printed out when the _safepoin_stats
a61af66fc99e Initial load
duke
parents:
diff changeset
1269 // array fills up.
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1270 if (_cur_stat_index == PrintSafepointStatisticsCount - 1) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1271 print_statistics();
a61af66fc99e Initial load
duke
parents:
diff changeset
1272 _cur_stat_index = 0;
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1273 } else {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1274 _cur_stat_index++;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1275 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1276 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1277 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1278
a61af66fc99e Initial load
duke
parents:
diff changeset
1279 void SafepointSynchronize::print_statistics() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1280 SafepointStats* sstats = _safepoint_stats;
a61af66fc99e Initial load
duke
parents:
diff changeset
1281
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1282 for (int index = 0; index <= _cur_stat_index; index++) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1283 if (index % 30 == 0) {
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1284 print_header();
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1285 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1286 sstats = &_safepoint_stats[index];
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1287 tty->print("%.3f: ", sstats->_time_stamp);
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1288 tty->print("%-26s ["
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1289 INT32_FORMAT_W(8)INT32_FORMAT_W(11)INT32_FORMAT_W(15)
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1290 " ] ",
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1291 sstats->_vmop_type == -1 ? "no vm operation" :
a61af66fc99e Initial load
duke
parents:
diff changeset
1292 VM_Operation::name(sstats->_vmop_type),
a61af66fc99e Initial load
duke
parents:
diff changeset
1293 sstats->_nof_total_threads,
a61af66fc99e Initial load
duke
parents:
diff changeset
1294 sstats->_nof_initial_running_threads,
a61af66fc99e Initial load
duke
parents:
diff changeset
1295 sstats->_nof_threads_wait_to_block);
a61af66fc99e Initial load
duke
parents:
diff changeset
1296 // "/ MICROUNITS " is to convert the unit from nanos to millis.
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1297 tty->print(" ["
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1298 INT64_FORMAT_W(6)INT64_FORMAT_W(6)
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1299 INT64_FORMAT_W(6)INT64_FORMAT_W(6)
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1300 INT64_FORMAT_W(6)" ] ",
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1301 sstats->_time_to_spin / MICROUNITS,
a61af66fc99e Initial load
duke
parents:
diff changeset
1302 sstats->_time_to_wait_to_block / MICROUNITS,
a61af66fc99e Initial load
duke
parents:
diff changeset
1303 sstats->_time_to_sync / MICROUNITS,
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1304 sstats->_time_to_do_cleanups / MICROUNITS,
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1305 sstats->_time_to_exec_vmop / MICROUNITS);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1306
a61af66fc99e Initial load
duke
parents:
diff changeset
1307 if (need_to_track_page_armed_status) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1308 tty->print(INT32_FORMAT" ", sstats->_page_armed);
a61af66fc99e Initial load
duke
parents:
diff changeset
1309 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1310 tty->print_cr(INT32_FORMAT" ", sstats->_nof_threads_hit_page_trap);
a61af66fc99e Initial load
duke
parents:
diff changeset
1311 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1312 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1313
a61af66fc99e Initial load
duke
parents:
diff changeset
1314 // This method will be called when VM exits. It will first call
a61af66fc99e Initial load
duke
parents:
diff changeset
1315 // print_statistics to print out the rest of the sampling. Then
a61af66fc99e Initial load
duke
parents:
diff changeset
1316 // it tries to summarize the sampling.
a61af66fc99e Initial load
duke
parents:
diff changeset
1317 void SafepointSynchronize::print_stat_on_exit() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1318 if (_safepoint_stats == NULL) return;
a61af66fc99e Initial load
duke
parents:
diff changeset
1319
a61af66fc99e Initial load
duke
parents:
diff changeset
1320 SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];
a61af66fc99e Initial load
duke
parents:
diff changeset
1321
a61af66fc99e Initial load
duke
parents:
diff changeset
1322 // During VM exit, end_statistics may not get called and in that
a61af66fc99e Initial load
duke
parents:
diff changeset
1323 // case, if the sync time is less than PrintSafepointStatisticsTimeout,
a61af66fc99e Initial load
duke
parents:
diff changeset
1324 // don't print it out.
a61af66fc99e Initial load
duke
parents:
diff changeset
1325 // Approximate the vm op time.
a61af66fc99e Initial load
duke
parents:
diff changeset
1326 _safepoint_stats[_cur_stat_index]._time_to_exec_vmop =
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1327 os::javaTimeNanos() - cleanup_end_time;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1328
a61af66fc99e Initial load
duke
parents:
diff changeset
1329 if ( PrintSafepointStatisticsTimeout < 0 ||
a61af66fc99e Initial load
duke
parents:
diff changeset
1330 spstat->_time_to_sync > PrintSafepointStatisticsTimeout * MICROUNITS) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1331 print_statistics();
a61af66fc99e Initial load
duke
parents:
diff changeset
1332 }
17937
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 17935
diff changeset
1333 tty->cr();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1334
a61af66fc99e Initial load
duke
parents:
diff changeset
1335 // Print out polling page sampling status.
a61af66fc99e Initial load
duke
parents:
diff changeset
1336 if (!need_to_track_page_armed_status) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1337 if (UseCompilerSafepoints) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1338 tty->print_cr("Polling page always armed");
a61af66fc99e Initial load
duke
parents:
diff changeset
1339 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1340 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
1341 tty->print_cr("Defer polling page loop count = %d\n",
a61af66fc99e Initial load
duke
parents:
diff changeset
1342 DeferPollingPageLoopCount);
a61af66fc99e Initial load
duke
parents:
diff changeset
1343 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1344
a61af66fc99e Initial load
duke
parents:
diff changeset
1345 for (int index = 0; index < VM_Operation::VMOp_Terminating; index++) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1346 if (_safepoint_reasons[index] != 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1347 tty->print_cr("%-26s"UINT64_FORMAT_W(10), VM_Operation::name(index),
a61af66fc99e Initial load
duke
parents:
diff changeset
1348 _safepoint_reasons[index]);
a61af66fc99e Initial load
duke
parents:
diff changeset
1349 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1350 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1351
a61af66fc99e Initial load
duke
parents:
diff changeset
1352 tty->print_cr(UINT64_FORMAT_W(5)" VM operations coalesced during safepoint",
a61af66fc99e Initial load
duke
parents:
diff changeset
1353 _coalesced_vmop_count);
a61af66fc99e Initial load
duke
parents:
diff changeset
1354 tty->print_cr("Maximum sync time "INT64_FORMAT_W(5)" ms",
a61af66fc99e Initial load
duke
parents:
diff changeset
1355 _max_sync_time / MICROUNITS);
1291
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1356 tty->print_cr("Maximum vm operation time (except for Exit VM operation) "
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1357 INT64_FORMAT_W(5)" ms",
4b0f2f4918ed 6933402: RFE: Improve PrintSafepointStatistics output to track cleanup time
xlu
parents: 1003
diff changeset
1358 _max_vmop_time / MICROUNITS);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1359 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1360
a61af66fc99e Initial load
duke
parents:
diff changeset
1361 // ------------------------------------------------------------------------------------------------
a61af66fc99e Initial load
duke
parents:
diff changeset
1362 // Non-product code
a61af66fc99e Initial load
duke
parents:
diff changeset
1363
a61af66fc99e Initial load
duke
parents:
diff changeset
1364 #ifndef PRODUCT
a61af66fc99e Initial load
duke
parents:
diff changeset
1365
a61af66fc99e Initial load
duke
parents:
diff changeset
1366 void SafepointSynchronize::print_state() {
a61af66fc99e Initial load
duke
parents:
diff changeset
1367 if (_state == _not_synchronized) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1368 tty->print_cr("not synchronized");
a61af66fc99e Initial load
duke
parents:
diff changeset
1369 } else if (_state == _synchronizing || _state == _synchronized) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1370 tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" :
a61af66fc99e Initial load
duke
parents:
diff changeset
1371 "synchronized");
a61af66fc99e Initial load
duke
parents:
diff changeset
1372
a61af66fc99e Initial load
duke
parents:
diff changeset
1373 for(JavaThread *cur = Threads::first(); cur; cur = cur->next()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1374 cur->safepoint_state()->print();
a61af66fc99e Initial load
duke
parents:
diff changeset
1375 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1376 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1377 }
a61af66fc99e Initial load
duke
parents:
diff changeset
1378
a61af66fc99e Initial load
duke
parents:
diff changeset
1379 void SafepointSynchronize::safepoint_msg(const char* format, ...) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1380 if (ShowSafepointMsgs) {
a61af66fc99e Initial load
duke
parents:
diff changeset
1381 va_list ap;
a61af66fc99e Initial load
duke
parents:
diff changeset
1382 va_start(ap, format);
a61af66fc99e Initial load
duke
parents:
diff changeset
1383 tty->vprint_cr(format, ap);
a61af66fc99e Initial load
duke
parents:
diff changeset
1384 va_end(ap);
a61af66fc99e Initial load
duke
parents:
diff changeset
1385 }
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1386 }
a61af66fc99e Initial load
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1387
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1388 #endif // !PRODUCT