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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 }
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