6197
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1 /*
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2 * Copyright (c) 2012, 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 #include "precompiled.hpp"
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25
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26 #include "runtime/atomic.hpp"
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27 #include "runtime/interfaceSupport.hpp"
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28 #include "runtime/mutexLocker.hpp"
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29 #include "runtime/safepoint.hpp"
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30 #include "runtime/threadCritical.hpp"
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31 #include "services/memPtr.hpp"
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32 #include "services/memReporter.hpp"
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33 #include "services/memTracker.hpp"
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34 #include "utilities/decoder.hpp"
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35 #include "utilities/globalDefinitions.hpp"
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36
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37 bool NMT_track_callsite = false;
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38
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39 // walk all 'known' threads at NMT sync point, and collect their recorders
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40 void SyncThreadRecorderClosure::do_thread(Thread* thread) {
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41 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
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42 if (thread->is_Java_thread()) {
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43 JavaThread* javaThread = (JavaThread*)thread;
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44 MemRecorder* recorder = javaThread->get_recorder();
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45 if (recorder != NULL) {
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46 MemTracker::enqueue_pending_recorder(recorder);
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47 javaThread->set_recorder(NULL);
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48 }
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49 }
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50 _thread_count ++;
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51 }
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52
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53
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54 MemRecorder* MemTracker::_global_recorder = NULL;
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55 MemSnapshot* MemTracker::_snapshot = NULL;
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56 MemBaseline MemTracker::_baseline;
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57 Mutex MemTracker::_query_lock(Monitor::native, "NMT_queryLock");
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58 volatile MemRecorder* MemTracker::_merge_pending_queue = NULL;
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59 volatile MemRecorder* MemTracker::_pooled_recorders = NULL;
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60 MemTrackWorker* MemTracker::_worker_thread = NULL;
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61 int MemTracker::_sync_point_skip_count = 0;
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62 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off;
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63 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited;
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64 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none;
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65 int MemTracker::_thread_count = 255;
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66 volatile jint MemTracker::_pooled_recorder_count = 0;
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67 debug_only(intx MemTracker::_main_thread_tid = 0;)
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68 debug_only(volatile jint MemTracker::_pending_recorder_count = 0;)
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69
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70 void MemTracker::init_tracking_options(const char* option_line) {
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71 _tracking_level = NMT_off;
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72 if (strncmp(option_line, "=summary", 8) == 0) {
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73 _tracking_level = NMT_summary;
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74 } else if (strncmp(option_line, "=detail", 8) == 0) {
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75 _tracking_level = NMT_detail;
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76 }
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77 }
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78
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79 // first phase of bootstrapping, when VM is still in single-threaded mode.
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80 void MemTracker::bootstrap_single_thread() {
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81 if (_tracking_level > NMT_off) {
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82 assert(_state == NMT_uninited, "wrong state");
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83
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84 // NMT is not supported with UseMallocOnly is on. NMT can NOT
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85 // handle the amount of malloc data without significantly impacting
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86 // runtime performance when this flag is on.
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87 if (UseMallocOnly) {
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88 shutdown(NMT_use_malloc_only);
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89 return;
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90 }
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91
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92 debug_only(_main_thread_tid = os::current_thread_id();)
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93 _state = NMT_bootstrapping_single_thread;
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94 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
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95 }
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96 }
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97
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98 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode.
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99 void MemTracker::bootstrap_multi_thread() {
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100 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) {
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101 // create nmt lock for multi-thread execution
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102 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
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103 _state = NMT_bootstrapping_multi_thread;
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104 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
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105 }
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106 }
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107
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108 // fully start nmt
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109 void MemTracker::start() {
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110 // Native memory tracking is off from command line option
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111 if (_tracking_level == NMT_off || shutdown_in_progress()) return;
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112
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113 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
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114 assert(_state == NMT_bootstrapping_multi_thread, "wrong state");
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115
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116 _snapshot = new (std::nothrow)MemSnapshot();
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117 if (_snapshot != NULL && !_snapshot->out_of_memory()) {
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118 if (start_worker()) {
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119 _state = NMT_started;
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120 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
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121 return;
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122 }
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123 }
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124
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125 // fail to start native memory tracking, shut it down
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126 shutdown(NMT_initialization);
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127 }
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128
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129 /**
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130 * Shutting down native memory tracking.
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131 * We can not shutdown native memory tracking immediately, so we just
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132 * setup shutdown pending flag, every native memory tracking component
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133 * should orderly shut itself down.
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134 *
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135 * The shutdown sequences:
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136 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state
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137 * 2. Worker thread calls MemTracker::final_shutdown(), which transites
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138 * MemTracker to final shutdown state.
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139 * 3. At sync point, MemTracker does final cleanup, before sets memory
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140 * tracking level to off to complete shutdown.
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141 */
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142 void MemTracker::shutdown(ShutdownReason reason) {
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143 if (_tracking_level == NMT_off) return;
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144
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145 if (_state <= NMT_bootstrapping_single_thread) {
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146 // we still in single thread mode, there is not contention
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147 _state = NMT_shutdown_pending;
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148 _reason = reason;
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149 } else {
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150 // we want to know who initialized shutdown
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151 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending,
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152 (jint*)&_state, (jint)NMT_started)) {
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153 _reason = reason;
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154 }
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155 }
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156 }
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157
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158 // final phase of shutdown
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159 void MemTracker::final_shutdown() {
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160 // delete all pending recorders and pooled recorders
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161 delete_all_pending_recorders();
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162 delete_all_pooled_recorders();
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163
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164 {
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165 // shared baseline and snapshot are the only objects needed to
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166 // create query results
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167 MutexLockerEx locker(&_query_lock, true);
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168 // cleanup baseline data and snapshot
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169 _baseline.clear();
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170 delete _snapshot;
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171 _snapshot = NULL;
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172 }
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173
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174 // shutdown shared decoder instance, since it is only
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175 // used by native memory tracking so far.
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176 Decoder::shutdown();
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177
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178 MemTrackWorker* worker = NULL;
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179 {
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180 ThreadCritical tc;
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181 // can not delete worker inside the thread critical
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182 if (_worker_thread != NULL && Thread::current() == _worker_thread) {
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183 worker = _worker_thread;
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184 _worker_thread = NULL;
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185 }
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186 }
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187 if (worker != NULL) {
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188 delete worker;
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189 }
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190 _state = NMT_final_shutdown;
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191 }
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192
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193 // delete all pooled recorders
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194 void MemTracker::delete_all_pooled_recorders() {
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195 // free all pooled recorders
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196 volatile MemRecorder* cur_head = _pooled_recorders;
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197 if (cur_head != NULL) {
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198 MemRecorder* null_ptr = NULL;
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199 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr,
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200 (void*)&_pooled_recorders, (void*)cur_head)) {
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201 cur_head = _pooled_recorders;
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202 }
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203 if (cur_head != NULL) {
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204 delete cur_head;
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205 _pooled_recorder_count = 0;
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206 }
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207 }
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208 }
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209
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210 // delete all recorders in pending queue
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211 void MemTracker::delete_all_pending_recorders() {
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212 // free all pending recorders
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213 MemRecorder* pending_head = get_pending_recorders();
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214 if (pending_head != NULL) {
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215 delete pending_head;
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216 }
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217 }
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218
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219 /*
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220 * retrieve per-thread recorder of specified thread.
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221 * if thread == NULL, it means global recorder
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222 */
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223 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) {
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224 if (shutdown_in_progress()) return NULL;
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225
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226 MemRecorder* rc;
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227 if (thread == NULL) {
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228 rc = _global_recorder;
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229 } else {
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230 rc = thread->get_recorder();
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231 }
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232
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233 if (rc != NULL && rc->is_full()) {
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234 enqueue_pending_recorder(rc);
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235 rc = NULL;
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236 }
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237
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238 if (rc == NULL) {
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239 rc = get_new_or_pooled_instance();
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240 if (thread == NULL) {
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241 _global_recorder = rc;
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242 } else {
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243 thread->set_recorder(rc);
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244 }
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245 }
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246 return rc;
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247 }
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248
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249 /*
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250 * get a per-thread recorder from pool, or create a new one if
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251 * there is not one available.
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252 */
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253 MemRecorder* MemTracker::get_new_or_pooled_instance() {
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254 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders);
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255 if (cur_head == NULL) {
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256 MemRecorder* rec = new (std::nothrow)MemRecorder();
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257 if (rec == NULL || rec->out_of_memory()) {
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258 shutdown(NMT_out_of_memory);
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259 if (rec != NULL) {
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260 delete rec;
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261 rec = NULL;
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262 }
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263 }
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264 return rec;
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265 } else {
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266 MemRecorder* next_head = cur_head->next();
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267 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders,
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268 (void*)cur_head)) {
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269 return get_new_or_pooled_instance();
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270 }
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271 cur_head->set_next(NULL);
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272 Atomic::dec(&_pooled_recorder_count);
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273 debug_only(cur_head->set_generation();)
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274 return cur_head;
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275 }
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276 }
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277
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278 /*
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279 * retrieve all recorders in pending queue, and empty the queue
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280 */
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281 MemRecorder* MemTracker::get_pending_recorders() {
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282 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
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283 MemRecorder* null_ptr = NULL;
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284 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue,
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285 (void*)cur_head)) {
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286 cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
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287 }
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288 debug_only(Atomic::store(0, &_pending_recorder_count));
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289 return cur_head;
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290 }
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291
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292 /*
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293 * release a recorder to recorder pool.
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294 */
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295 void MemTracker::release_thread_recorder(MemRecorder* rec) {
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296 assert(rec != NULL, "null recorder");
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297 // we don't want to pool too many recorders
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298 rec->set_next(NULL);
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299 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) {
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300 delete rec;
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301 return;
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302 }
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303
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304 rec->clear();
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305 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders);
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306 rec->set_next(cur_head);
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307 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders,
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308 (void*)cur_head)) {
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309 cur_head = const_cast<MemRecorder*>(_pooled_recorders);
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310 rec->set_next(cur_head);
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311 }
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312 Atomic::inc(&_pooled_recorder_count);
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313 }
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314
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315 /*
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316 * This is the most important method in whole nmt implementation.
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317 *
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318 * Create a memory record.
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319 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM
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320 * still in single thread mode.
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321 * 2. For all threads other than JavaThread, ThreadCritical is needed
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322 * to write to recorders to global recorder.
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323 * 3. For JavaThreads that are not longer visible by safepoint, also
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324 * need to take ThreadCritical and records are written to global
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325 * recorders, since these threads are NOT walked by Threads.do_thread().
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326 * 4. JavaThreads that are running in native state, have to transition
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327 * to VM state before writing to per-thread recorders.
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328 * 5. JavaThreads that are running in VM state do not need any lock and
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329 * records are written to per-thread recorders.
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330 * 6. For a thread has yet to attach VM 'Thread', they need to take
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331 * ThreadCritical to write to global recorder.
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332 *
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333 * Important note:
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334 * NO LOCK should be taken inside ThreadCritical lock !!!
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335 */
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336 void MemTracker::create_memory_record(address addr, MEMFLAGS flags,
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337 size_t size, address pc, Thread* thread) {
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338 if (!shutdown_in_progress()) {
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339 // single thread, we just write records direct to global recorder,'
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340 // with any lock
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341 if (_state == NMT_bootstrapping_single_thread) {
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342 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
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343 thread = NULL;
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344 } else {
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345 if (thread == NULL) {
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346 // don't use Thread::current(), since it is possible that
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347 // the calling thread has yet to attach to VM 'Thread',
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348 // which will result assertion failure
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349 thread = ThreadLocalStorage::thread();
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350 }
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351 }
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352
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353 if (thread != NULL) {
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354 // for a JavaThread, if it is running in native state, we need to transition it to
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355 // VM state, so it can stop at safepoint. JavaThread running in VM state does not
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356 // need lock to write records.
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357 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) {
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358 if (((JavaThread*)thread)->thread_state() == _thread_in_native) {
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359 ThreadInVMfromNative trans((JavaThread*)thread);
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360 create_record_in_recorder(addr, flags, size, pc, thread);
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361 } else {
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362 create_record_in_recorder(addr, flags, size, pc, thread);
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363 }
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364 } else {
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365 // other threads, such as worker and watcher threads, etc. need to
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366 // take ThreadCritical to write to global recorder
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367 ThreadCritical tc;
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368 create_record_in_recorder(addr, flags, size, pc, NULL);
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369 }
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370 } else {
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371 if (_state == NMT_bootstrapping_single_thread) {
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372 // single thread, no lock needed
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373 create_record_in_recorder(addr, flags, size, pc, NULL);
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374 } else {
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375 // for thread has yet to attach VM 'Thread', we can not use VM mutex.
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376 // use native thread critical instead
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377 ThreadCritical tc;
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378 create_record_in_recorder(addr, flags, size, pc, NULL);
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379 }
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380 }
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381 }
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382 }
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383
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384 // write a record to proper recorder. No lock can be taken from this method
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385 // down.
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386 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags,
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387 size_t size, address pc, Thread* thread) {
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388 assert(thread == NULL || thread->is_Java_thread(), "wrong thread");
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389
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390 MemRecorder* rc = get_thread_recorder((JavaThread*)thread);
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391 if (rc != NULL) {
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392 rc->record(addr, flags, size, pc);
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393 }
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394 }
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395
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396 /**
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397 * enqueue a recorder to pending queue
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398 */
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399 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) {
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400 assert(rec != NULL, "null recorder");
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401
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402 // we are shutting down, so just delete it
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403 if (shutdown_in_progress()) {
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404 rec->set_next(NULL);
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405 delete rec;
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406 return;
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407 }
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408
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409 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
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410 rec->set_next(cur_head);
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411 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue,
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412 (void*)cur_head)) {
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413 cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
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414 rec->set_next(cur_head);
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415 }
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416 debug_only(Atomic::inc(&_pending_recorder_count);)
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417 }
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418
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419 /*
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420 * The method is called at global safepoint
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421 * during it synchronization process.
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422 * 1. enqueue all JavaThreads' per-thread recorders
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423 * 2. enqueue global recorder
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424 * 3. retrieve all pending recorders
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425 * 4. reset global sequence number generator
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426 * 5. call worker's sync
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427 */
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428 #define MAX_SAFEPOINTS_TO_SKIP 128
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429 #define SAFE_SEQUENCE_THRESHOLD 30
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430 #define HIGH_GENERATION_THRESHOLD 60
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431
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432 void MemTracker::sync() {
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433 assert(_tracking_level > NMT_off, "NMT is not enabled");
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434 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
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435
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436 // Some GC tests hit large number of safepoints in short period of time
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437 // without meaningful activities. We should prevent going to
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438 // sync point in these cases, which can potentially exhaust generation buffer.
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439 // Here is the factots to determine if we should go into sync point:
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440 // 1. not to overflow sequence number
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441 // 2. if we are in danger to overflow generation buffer
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442 // 3. how many safepoints we already skipped sync point
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443 if (_state == NMT_started) {
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444 // worker thread is not ready, no one can manage generation
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445 // buffer, so skip this safepoint
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446 if (_worker_thread == NULL) return;
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447
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448 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) {
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449 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint;
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450 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS;
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451 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) {
|
|
452 _sync_point_skip_count ++;
|
|
453 return;
|
|
454 }
|
|
455 }
|
|
456 _sync_point_skip_count = 0;
|
|
457 // walk all JavaThreads to collect recorders
|
|
458 SyncThreadRecorderClosure stc;
|
|
459 Threads::threads_do(&stc);
|
|
460
|
|
461 _thread_count = stc.get_thread_count();
|
|
462 MemRecorder* pending_recorders = get_pending_recorders();
|
|
463
|
|
464 {
|
|
465 // This method is running at safepoint, with ThreadCritical lock,
|
|
466 // it should guarantee that NMT is fully sync-ed.
|
|
467 ThreadCritical tc;
|
|
468 if (_global_recorder != NULL) {
|
|
469 _global_recorder->set_next(pending_recorders);
|
|
470 pending_recorders = _global_recorder;
|
|
471 _global_recorder = NULL;
|
|
472 }
|
|
473 SequenceGenerator::reset();
|
|
474 // check _worker_thread with lock to avoid racing condition
|
|
475 if (_worker_thread != NULL) {
|
|
476 _worker_thread->at_sync_point(pending_recorders);
|
|
477 }
|
|
478 }
|
|
479 }
|
|
480
|
|
481 // now, it is the time to shut whole things off
|
|
482 if (_state == NMT_final_shutdown) {
|
|
483 _tracking_level = NMT_off;
|
|
484
|
|
485 // walk all JavaThreads to delete all recorders
|
|
486 SyncThreadRecorderClosure stc;
|
|
487 Threads::threads_do(&stc);
|
|
488 // delete global recorder
|
|
489 {
|
|
490 ThreadCritical tc;
|
|
491 if (_global_recorder != NULL) {
|
|
492 delete _global_recorder;
|
|
493 _global_recorder = NULL;
|
|
494 }
|
|
495 }
|
|
496
|
|
497 _state = NMT_shutdown;
|
|
498 }
|
|
499 }
|
|
500
|
|
501 /*
|
|
502 * Start worker thread.
|
|
503 */
|
|
504 bool MemTracker::start_worker() {
|
|
505 assert(_worker_thread == NULL, "Just Check");
|
|
506 _worker_thread = new (std::nothrow) MemTrackWorker();
|
|
507 if (_worker_thread == NULL || _worker_thread->has_error()) {
|
|
508 shutdown(NMT_initialization);
|
|
509 return false;
|
|
510 }
|
|
511 _worker_thread->start();
|
|
512 return true;
|
|
513 }
|
|
514
|
|
515 /*
|
|
516 * We need to collect a JavaThread's per-thread recorder
|
|
517 * before it exits.
|
|
518 */
|
|
519 void MemTracker::thread_exiting(JavaThread* thread) {
|
|
520 if (is_on()) {
|
|
521 MemRecorder* rec = thread->get_recorder();
|
|
522 if (rec != NULL) {
|
|
523 enqueue_pending_recorder(rec);
|
|
524 thread->set_recorder(NULL);
|
|
525 }
|
|
526 }
|
|
527 }
|
|
528
|
|
529 // baseline current memory snapshot
|
|
530 bool MemTracker::baseline() {
|
|
531 MutexLockerEx lock(&_query_lock, true);
|
|
532 MemSnapshot* snapshot = get_snapshot();
|
|
533 if (snapshot != NULL) {
|
|
534 return _baseline.baseline(*snapshot, false);
|
|
535 }
|
|
536 return false;
|
|
537 }
|
|
538
|
|
539 // print memory usage from current snapshot
|
|
540 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) {
|
|
541 MemBaseline baseline;
|
|
542 MutexLockerEx lock(&_query_lock, true);
|
|
543 MemSnapshot* snapshot = get_snapshot();
|
|
544 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) {
|
|
545 BaselineReporter reporter(out, unit);
|
|
546 reporter.report_baseline(baseline, summary_only);
|
|
547 return true;
|
|
548 }
|
|
549 return false;
|
|
550 }
|
|
551
|
|
552 // compare memory usage between current snapshot and baseline
|
|
553 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) {
|
|
554 MutexLockerEx lock(&_query_lock, true);
|
|
555 if (_baseline.baselined()) {
|
|
556 MemBaseline baseline;
|
|
557 MemSnapshot* snapshot = get_snapshot();
|
|
558 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) {
|
|
559 BaselineReporter reporter(out, unit);
|
|
560 reporter.diff_baselines(baseline, _baseline, summary_only);
|
|
561 return true;
|
|
562 }
|
|
563 }
|
|
564 return false;
|
|
565 }
|
|
566
|
|
567 #ifndef PRODUCT
|
|
568 void MemTracker::walk_stack(int toSkip, char* buf, int len) {
|
|
569 int cur_len = 0;
|
|
570 char tmp[1024];
|
|
571 address pc;
|
|
572
|
|
573 while (cur_len < len) {
|
|
574 pc = os::get_caller_pc(toSkip + 1);
|
|
575 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) {
|
|
576 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp);
|
|
577 cur_len = (int)strlen(buf);
|
|
578 } else {
|
|
579 buf[cur_len] = '\0';
|
|
580 break;
|
|
581 }
|
|
582 toSkip ++;
|
|
583 }
|
|
584 }
|
|
585
|
|
586 void MemTracker::print_tracker_stats(outputStream* st) {
|
|
587 st->print_cr("\nMemory Tracker Stats:");
|
|
588 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num());
|
|
589 st->print_cr("\tthead count = %d", _thread_count);
|
|
590 st->print_cr("\tArena instance = %d", Arena::_instance_count);
|
|
591 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count);
|
|
592 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count);
|
|
593 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count);
|
|
594 if (_worker_thread != NULL) {
|
|
595 st->print_cr("\tWorker thread:");
|
|
596 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count);
|
|
597 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders());
|
|
598 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count);
|
|
599 } else {
|
|
600 st->print_cr("\tWorker thread is not started");
|
|
601 }
|
|
602 st->print_cr(" ");
|
|
603
|
|
604 if (_snapshot != NULL) {
|
|
605 _snapshot->print_snapshot_stats(st);
|
|
606 } else {
|
|
607 st->print_cr("No snapshot");
|
|
608 }
|
|
609 }
|
|
610 #endif
|
|
611
|