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1 /* |
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2 * Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 # include "incls/_precompiled.incl" |
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26 # include "incls/_perfMemory.cpp.incl" |
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27 |
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28 char* PerfMemory::_start = NULL; |
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29 char* PerfMemory::_end = NULL; |
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30 char* PerfMemory::_top = NULL; |
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31 size_t PerfMemory::_capacity = 0; |
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32 jint PerfMemory::_initialized = false; |
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33 PerfDataPrologue* PerfMemory::_prologue = NULL; |
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34 |
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35 void perfMemory_init() { |
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36 |
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37 if (!UsePerfData) return; |
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38 |
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39 PerfMemory::initialize(); |
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40 } |
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41 |
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42 void perfMemory_exit() { |
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43 |
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44 if (!UsePerfData) return; |
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45 if (!PerfMemory::is_initialized()) return; |
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46 |
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47 // if the StatSampler is active, then we don't want to remove |
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48 // resources it may be dependent on. Typically, the StatSampler |
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49 // is disengaged from the watcher thread when this method is called, |
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50 // but it is not disengaged if this method is invoked during a |
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51 // VM abort. |
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52 // |
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53 if (!StatSampler::is_active()) |
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54 PerfDataManager::destroy(); |
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55 |
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56 // remove the persistent external resources, if any. this method |
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57 // does not unmap or invalidate any virtual memory allocated during |
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58 // initialization. |
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59 // |
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60 PerfMemory::destroy(); |
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61 } |
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62 |
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63 void PerfMemory::initialize() { |
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64 |
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65 if (_prologue != NULL) |
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66 // initialization already performed |
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67 return; |
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68 |
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69 size_t capacity = align_size_up(PerfDataMemorySize, |
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70 os::vm_allocation_granularity()); |
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71 |
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72 if (PerfTraceMemOps) { |
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73 tty->print("PerfDataMemorySize = " SIZE_FORMAT "," |
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74 " os::vm_allocation_granularity = " SIZE_FORMAT "," |
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75 " adjusted size = " SIZE_FORMAT "\n", |
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76 PerfDataMemorySize, |
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77 os::vm_allocation_granularity(), |
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78 capacity); |
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79 } |
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80 |
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81 // allocate PerfData memory region |
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82 create_memory_region(capacity); |
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83 |
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84 if (_start == NULL) { |
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85 |
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86 // the PerfMemory region could not be created as desired. Rather |
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87 // than terminating the JVM, we revert to creating the instrumentation |
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88 // on the C heap. When running in this mode, external monitoring |
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89 // clients cannot attach to and monitor this JVM. |
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90 // |
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91 // the warning is issued only in debug mode in order to avoid |
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92 // additional output to the stdout or stderr output streams. |
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93 // |
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94 if (PrintMiscellaneous && Verbose) { |
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95 warning("Could not create PerfData Memory region, reverting to malloc"); |
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96 } |
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97 |
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98 _prologue = NEW_C_HEAP_OBJ(PerfDataPrologue); |
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99 } |
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100 else { |
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101 |
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102 // the PerfMemory region was created as expected. |
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103 |
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104 if (PerfTraceMemOps) { |
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105 tty->print("PerfMemory created: address = " INTPTR_FORMAT "," |
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106 " size = " SIZE_FORMAT "\n", |
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107 (void*)_start, |
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108 _capacity); |
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109 } |
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110 |
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111 _prologue = (PerfDataPrologue *)_start; |
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112 _end = _start + _capacity; |
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113 _top = _start + sizeof(PerfDataPrologue); |
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114 } |
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115 |
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116 assert(_prologue != NULL, "prologue pointer must be initialized"); |
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117 |
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118 #ifdef VM_LITTLE_ENDIAN |
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119 _prologue->magic = (jint)0xc0c0feca; |
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120 _prologue->byte_order = PERFDATA_LITTLE_ENDIAN; |
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121 #else |
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122 _prologue->magic = (jint)0xcafec0c0; |
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123 _prologue->byte_order = PERFDATA_BIG_ENDIAN; |
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124 #endif |
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125 |
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126 _prologue->major_version = PERFDATA_MAJOR_VERSION; |
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127 _prologue->minor_version = PERFDATA_MINOR_VERSION; |
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128 _prologue->accessible = 0; |
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129 |
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130 _prologue->entry_offset = sizeof(PerfDataPrologue); |
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131 _prologue->num_entries = 0; |
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132 _prologue->used = 0; |
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133 _prologue->overflow = 0; |
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134 _prologue->mod_time_stamp = 0; |
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135 |
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136 OrderAccess::release_store(&_initialized, 1); |
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137 } |
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138 |
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139 void PerfMemory::destroy() { |
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140 |
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141 assert(_prologue != NULL, "prologue pointer must be initialized"); |
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142 |
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143 if (_start != NULL && _prologue->overflow != 0) { |
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144 |
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145 // This state indicates that the contiguous memory region exists and |
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146 // that it wasn't large enough to hold all the counters. In this case, |
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147 // we output a warning message to the user on exit if the -XX:+Verbose |
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148 // flag is set (a debug only flag). External monitoring tools can detect |
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149 // this condition by monitoring the _prologue->overflow word. |
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150 // |
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151 // There are two tunables that can help resolve this issue: |
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152 // - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n> |
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153 // - decrease the maximum string constant length with |
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154 // -XX:PerfMaxStringConstLength=<n> |
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155 // |
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156 if (PrintMiscellaneous && Verbose) { |
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157 warning("PerfMemory Overflow Occurred.\n" |
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158 "\tCapacity = " SIZE_FORMAT " bytes" |
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159 " Used = " SIZE_FORMAT " bytes" |
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160 " Overflow = " INT32_FORMAT " bytes" |
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161 "\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.", |
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162 PerfMemory::capacity(), |
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163 PerfMemory::used(), |
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164 _prologue->overflow); |
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165 } |
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166 } |
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167 |
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168 if (_start != NULL) { |
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169 |
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170 // this state indicates that the contiguous memory region was successfully |
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171 // and that persistent resources may need to be cleaned up. This is |
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172 // expected to be the typical condition. |
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173 // |
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174 delete_memory_region(); |
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175 } |
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176 |
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177 _start = NULL; |
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178 _end = NULL; |
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179 _top = NULL; |
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180 _prologue = NULL; |
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181 _capacity = 0; |
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182 } |
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183 |
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184 // allocate an aligned block of memory from the PerfData memory |
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185 // region. This method assumes that the PerfData memory region |
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186 // was aligned on a double word boundary when created. |
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187 // |
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188 char* PerfMemory::alloc(size_t size) { |
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189 |
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190 if (!UsePerfData) return NULL; |
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191 |
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192 MutexLocker ml(PerfDataMemAlloc_lock); |
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193 |
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194 assert(_prologue != NULL, "called before initialization"); |
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195 |
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196 // check that there is enough memory for this request |
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197 if ((_top + size) >= _end) { |
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198 |
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199 _prologue->overflow += (jint)size; |
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200 |
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201 return NULL; |
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202 } |
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203 |
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204 char* result = _top; |
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205 |
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206 _top += size; |
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207 |
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208 assert(contains(result), "PerfData memory pointer out of range"); |
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209 |
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210 _prologue->used = (jint)used(); |
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211 _prologue->num_entries = _prologue->num_entries + 1; |
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212 |
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213 return result; |
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214 } |
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215 |
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216 void PerfMemory::mark_updated() { |
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217 if (!UsePerfData) return; |
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218 |
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219 _prologue->mod_time_stamp = os::elapsed_counter(); |
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220 } |
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221 |
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222 // Returns the complete path including the file name of performance data file. |
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223 // Caller is expected to release the allocated memory. |
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224 char* PerfMemory::get_perfdata_file_path() { |
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225 char* dest_file = NULL; |
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226 |
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227 if (PerfDataSaveFile != NULL) { |
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228 // dest_file_name stores the validated file name if file_name |
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229 // contains %p which will be replaced by pid. |
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230 dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN); |
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231 if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile), |
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232 dest_file, JVM_MAXPATHLEN)) { |
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233 FREE_C_HEAP_ARRAY(char, dest_file); |
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234 if (PrintMiscellaneous && Verbose) { |
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235 warning("Invalid performance data file path name specified, "\ |
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236 "fall back to a default name"); |
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237 } |
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238 } else { |
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239 return dest_file; |
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240 } |
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241 } |
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242 // create the name of the file for retaining the instrumentation memory. |
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243 dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN); |
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244 jio_snprintf(dest_file, PERFDATA_FILENAME_LEN, |
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245 "%s_%d", PERFDATA_NAME, os::current_process_id()); |
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246 |
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247 return dest_file; |
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248 } |