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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 /* jvmstat global and subsystem counter name space - enumeration value |
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26 * serve as an index into the PerfDataManager::_name_space[] array |
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27 * containing the corresponding name space string. Only the top level |
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28 * subsystem name spaces are represented here. |
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29 */ |
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30 enum CounterNS { |
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31 // top level name spaces |
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32 JAVA_NS, |
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33 COM_NS, |
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34 SUN_NS, |
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35 // subsystem name spaces |
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36 JAVA_GC, // Garbage Collection name spaces |
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37 COM_GC, |
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38 SUN_GC, |
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39 JAVA_CI, // Compiler name spaces |
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40 COM_CI, |
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41 SUN_CI, |
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42 JAVA_CLS, // Class Loader name spaces |
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43 COM_CLS, |
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44 SUN_CLS, |
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45 JAVA_RT, // Runtime name spaces |
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46 COM_RT, |
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47 SUN_RT, |
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48 JAVA_OS, // Operating System name spaces |
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49 COM_OS, |
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50 SUN_OS, |
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51 JAVA_THREADS, // Threads System name spaces |
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52 COM_THREADS, |
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53 SUN_THREADS, |
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54 JAVA_PROPERTY, // Java Property name spaces |
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55 COM_PROPERTY, |
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56 SUN_PROPERTY, |
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57 NULL_NS, |
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58 COUNTERNS_LAST = NULL_NS |
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59 }; |
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60 |
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61 /* |
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62 * Classes to support access to production performance data |
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63 * |
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64 * The PerfData class structure is provided for creation, access, and update |
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65 * of performance data (a.k.a. instrumentation) in a specific memory region |
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66 * which is possibly accessible as shared memory. Although not explicitly |
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67 * prevented from doing so, developers should not use the values returned |
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68 * by accessor methods to make algorithmic decisions as they are potentially |
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69 * extracted from a shared memory region. Although any shared memory region |
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70 * created is with appropriate access restrictions, allowing read-write access |
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71 * only to the principal that created the JVM, it is believed that a the |
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72 * shared memory region facilitates an easier attack path than attacks |
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73 * launched through mechanisms such as /proc. For this reason, it is |
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74 * recommended that data returned by PerfData accessor methods be used |
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75 * cautiously. |
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76 * |
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77 * There are three variability classifications of performance data |
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78 * Constants - value is written to the PerfData memory once, on creation |
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79 * Variables - value is modifiable, with no particular restrictions |
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80 * Counters - value is monotonically changing (increasing or decreasing) |
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81 * |
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82 * The performance data items can also have various types. The class |
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83 * hierarchy and the structure of the memory region are designed to |
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84 * accommodate new types as they are needed. Types are specified in |
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85 * terms of Java basic types, which accommodates client applications |
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86 * written in the Java programming language. The class hierarchy is: |
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87 * |
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88 * - PerfData (Abstract) |
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89 * - PerfLong (Abstract) |
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90 * - PerfLongConstant (alias: PerfConstant) |
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91 * - PerfLongVariant (Abstract) |
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92 * - PerfLongVariable (alias: PerfVariable) |
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93 * - PerfLongCounter (alias: PerfCounter) |
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94 * |
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95 * - PerfByteArray (Abstract) |
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96 * - PerfString (Abstract) |
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97 * - PerfStringVariable |
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98 * - PerfStringConstant |
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99 * |
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100 * |
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101 * As seen in the class hierarchy, the initially supported types are: |
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102 * |
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103 * Long - performance data holds a Java long type |
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104 * ByteArray - performance data holds an array of Java bytes |
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105 * used for holding C++ char arrays. |
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106 * |
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107 * The String type is derived from the ByteArray type. |
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108 * |
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109 * A PerfData subtype is not required to provide an implementation for |
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110 * each variability classification. For example, the String type provides |
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111 * Variable and Constant variablility classifications in the PerfStringVariable |
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112 * and PerfStringConstant classes, but does not provide a counter type. |
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113 * |
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114 * Performance data are also described by a unit of measure. Units allow |
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115 * client applications to make reasonable decisions on how to treat |
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116 * performance data generically, preventing the need to hard-code the |
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117 * specifics of a particular data item in client applications. The current |
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118 * set of units are: |
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119 * |
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120 * None - the data has no units of measure |
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121 * Bytes - data is measured in bytes |
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122 * Ticks - data is measured in clock ticks |
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123 * Events - data is measured in events. For example, |
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124 * the number of garbage collection events or the |
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125 * number of methods compiled. |
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126 * String - data is not numerical. For example, |
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127 * the java command line options |
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128 * Hertz - data is a frequency |
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129 * |
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130 * The performance counters also provide a support attribute, indicating |
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131 * the stability of the counter as a programmatic interface. The support |
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132 * level is also implied by the name space in which the counter is created. |
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133 * The counter name space support conventions follow the Java package, class, |
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134 * and property support conventions: |
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135 * |
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136 * java.* - stable, supported interface |
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137 * com.sun.* - unstable, supported interface |
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138 * sun.* - unstable, unsupported interface |
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139 * |
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140 * In the above context, unstable is a measure of the interface support |
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141 * level, not the implementation stability level. |
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142 * |
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143 * Currently, instances of PerfData subtypes are considered to have |
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144 * a life time equal to that of the VM and are managed by the |
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145 * PerfDataManager class. All constructors for the PerfData class and |
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146 * its subtypes have protected constructors. Creation of PerfData |
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147 * instances is performed by invoking various create methods on the |
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148 * PerfDataManager class. Users should not attempt to delete these |
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149 * instances as the PerfDataManager class expects to perform deletion |
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150 * operations on exit of the VM. |
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151 * |
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152 * Examples: |
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153 * |
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154 * Creating performance counter that holds a monotonically increasing |
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155 * long data value with units specified in U_Bytes in the "java.gc.*" |
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156 * name space. |
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157 * |
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158 * PerfLongCounter* foo_counter; |
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159 * |
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160 * foo_counter = PerfDataManager::create_long_counter(JAVA_GC, "foo", |
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161 * PerfData::U_Bytes, |
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162 * optionalInitialValue, |
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163 * CHECK); |
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164 * foo_counter->inc(); |
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165 * |
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166 * Creating a performance counter that holds a variably change long |
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167 * data value with untis specified in U_Bytes in the "com.sun.ci |
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168 * name space. |
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169 * |
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170 * PerfLongVariable* bar_varible; |
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171 * bar_variable = PerfDataManager::create_long_variable(COM_CI, "bar", |
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172 .* PerfData::U_Bytes, |
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173 * optionalInitialValue, |
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174 * CHECK); |
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175 * |
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176 * bar_variable->inc(); |
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177 * bar_variable->set_value(0); |
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178 * |
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179 * Creating a performance counter that holds a constant string value in |
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180 * the "sun.cls.*" name space. |
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181 * |
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182 * PerfDataManager::create_string_constant(SUN_CLS, "foo", string, CHECK); |
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183 * |
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184 * Although the create_string_constant() factory method returns a pointer |
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185 * to the PerfStringConstant object, it can safely be ignored. Developers |
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186 * are not encouraged to access the string constant's value via this |
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187 * pointer at this time due to security concerns. |
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188 * |
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189 * Creating a performance counter in an arbitrary name space that holds a |
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190 * value that is sampled by the StatSampler periodic task. |
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191 * |
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192 * PerfDataManager::create_counter("foo.sampled", PerfData::U_Events, |
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193 * &my_jlong, CHECK); |
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194 * |
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195 * In this example, the PerfData pointer can be ignored as the caller |
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196 * is relying on the StatSampler PeriodicTask to sample the given |
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197 * address at a regular interval. The interval is defined by the |
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198 * PerfDataSamplingInterval global variable, and is applyied on |
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199 * a system wide basis, not on an per-counter basis. |
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200 * |
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201 * Creating a performance counter in an arbitrary name space that utilizes |
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202 * a helper object to return a value to the StatSampler via the take_sample() |
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203 * method. |
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204 * |
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205 * class MyTimeSampler : public PerfLongSampleHelper { |
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206 * public: |
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207 * jlong take_sample() { return os::elapsed_counter(); } |
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208 * }; |
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209 * |
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210 * PerfDataManager::create_counter(SUN_RT, "helped", |
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211 * PerfData::U_Ticks, |
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212 * new MyTimeSampler(), CHECK); |
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213 * |
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214 * In this example, a subtype of PerfLongSampleHelper is instantiated |
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215 * and its take_sample() method is overridden to perform whatever |
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216 * operation is necessary to generate the data sample. This method |
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217 * will be called by the StatSampler at a regular interval, defined |
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218 * by the PerfDataSamplingInterval global variable. |
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219 * |
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220 * As before, PerfSampleHelper is an alias for PerfLongSampleHelper. |
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221 * |
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222 * For additional uses of PerfData subtypes, see the utility classes |
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223 * PerfTraceTime and PerfTraceTimedEvent below. |
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224 * |
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225 * Always-on non-sampled counters can be created independent of |
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226 * the UsePerfData flag. Counters will be created on the c-heap |
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227 * if UsePerfData is false. |
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228 * |
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229 * Until further noice, all PerfData objects should be created and |
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230 * manipulated within a guarded block. The guard variable is |
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231 * UsePerfData, a product flag set to true by default. This flag may |
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232 * be removed from the product in the future. |
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233 * |
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234 */ |
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235 class PerfData : public CHeapObj { |
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236 |
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237 friend class StatSampler; // for access to protected void sample() |
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238 friend class PerfDataManager; // for access to protected destructor |
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239 |
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240 public: |
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241 |
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242 // the Variability enum must be kept in synchronization with the |
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243 // the com.sun.hotspot.perfdata.Variability class |
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244 enum Variability { |
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245 V_Constant = 1, |
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246 V_Monotonic = 2, |
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247 V_Variable = 3, |
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248 V_last = V_Variable |
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249 }; |
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250 |
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251 // the Units enum must be kept in synchronization with the |
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252 // the com.sun.hotspot.perfdata.Units class |
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253 enum Units { |
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254 U_None = 1, |
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255 U_Bytes = 2, |
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256 U_Ticks = 3, |
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257 U_Events = 4, |
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258 U_String = 5, |
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259 U_Hertz = 6, |
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260 U_Last = U_Hertz |
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261 }; |
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262 |
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263 // Miscellaneous flags |
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264 enum Flags { |
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265 F_None = 0x0, |
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266 F_Supported = 0x1 // interface is supported - java.* and com.sun.* |
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267 }; |
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268 |
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269 private: |
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270 char* _name; |
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271 Variability _v; |
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272 Units _u; |
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273 bool _on_c_heap; |
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274 Flags _flags; |
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275 |
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276 PerfDataEntry* _pdep; |
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277 |
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278 protected: |
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279 |
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280 void *_valuep; |
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281 |
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282 PerfData(CounterNS ns, const char* name, Units u, Variability v); |
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283 ~PerfData(); |
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284 |
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285 // create the entry for the PerfData item in the PerfData memory region. |
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286 // this region is maintained separately from the PerfData objects to |
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287 // facilitate its use by external processes. |
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288 void create_entry(BasicType dtype, size_t dsize, size_t dlen = 0); |
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289 |
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290 // sample the data item given at creation time and write its value |
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291 // into the its corresponding PerfMemory location. |
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292 virtual void sample() = 0; |
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293 |
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294 public: |
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295 |
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296 // returns a boolean indicating the validity of this object. |
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297 // the object is valid if and only if memory in PerfMemory |
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298 // region was successfully allocated. |
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299 inline bool is_valid() { return _valuep != NULL; } |
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300 |
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301 // returns a boolean indicating whether the underlying object |
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302 // was allocated in the PerfMemory region or on the C heap. |
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303 inline bool is_on_c_heap() { return _on_c_heap; } |
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304 |
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305 // returns a pointer to a char* containing the name of the item. |
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306 // The pointer returned is the pointer to a copy of the name |
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307 // passed to the constructor, not the pointer to the name in the |
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308 // PerfData memory region. This redundancy is maintained for |
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309 // security reasons as the PerfMemory region may be in shared |
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310 // memory. |
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311 const char* name() { return _name; } |
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312 |
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313 // returns the variability classification associated with this item |
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314 Variability variability() { return _v; } |
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315 |
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316 // returns the units associated with this item. |
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317 Units units() { return _u; } |
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318 |
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319 // returns the flags associated with this item. |
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320 Flags flags() { return _flags; } |
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321 |
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322 // returns the address of the data portion of the item in the |
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323 // PerfData memory region. |
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324 inline void* get_address() { return _valuep; } |
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325 |
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326 // returns the value of the data portion of the item in the |
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327 // PerfData memory region formatted as a string. |
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328 virtual int format(char* cp, int length) = 0; |
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329 }; |
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330 |
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331 /* |
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332 * PerfLongSampleHelper, and its alias PerfSamplerHelper, is a base class |
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333 * for helper classes that rely upon the StatSampler periodic task to |
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334 * invoke the take_sample() method and write the value returned to its |
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335 * appropriate location in the PerfData memory region. |
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336 */ |
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337 class PerfLongSampleHelper : public CHeapObj { |
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338 public: |
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339 virtual jlong take_sample() = 0; |
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340 }; |
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341 |
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342 typedef PerfLongSampleHelper PerfSampleHelper; |
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343 |
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344 |
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345 /* |
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346 * PerfLong is the base class for the various Long PerfData subtypes. |
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347 * it contains implementation details that are common among its derived |
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348 * types. |
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349 */ |
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350 class PerfLong : public PerfData { |
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351 |
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352 protected: |
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353 |
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354 PerfLong(CounterNS ns, const char* namep, Units u, Variability v); |
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355 |
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356 public: |
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357 int format(char* buffer, int length); |
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358 |
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359 // returns the value of the data portion of the item in the |
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360 // PerfData memory region. |
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361 inline jlong get_value() { return *(jlong*)_valuep; } |
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362 }; |
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363 |
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364 /* |
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365 * The PerfLongConstant class, and its alias PerfConstant, implement |
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366 * a PerfData subtype that holds a jlong data value that is set upon |
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367 * creation of an instance of this class. This class provides no |
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368 * methods for changing the data value stored in PerfData memory region. |
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369 */ |
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370 class PerfLongConstant : public PerfLong { |
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371 |
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372 friend class PerfDataManager; // for access to protected constructor |
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373 |
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374 private: |
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375 // hide sample() - no need to sample constants |
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376 void sample() { } |
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377 |
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378 protected: |
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379 |
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380 PerfLongConstant(CounterNS ns, const char* namep, Units u, |
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381 jlong initial_value=0) |
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382 : PerfLong(ns, namep, u, V_Constant) { |
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383 |
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384 if (is_valid()) *(jlong*)_valuep = initial_value; |
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385 } |
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386 }; |
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387 |
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388 typedef PerfLongConstant PerfConstant; |
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389 |
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390 /* |
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391 * The PerfLongVariant class, and its alias PerfVariant, implement |
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392 * a PerfData subtype that holds a jlong data value that can be modified |
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393 * in an unrestricted manner. This class provides the implementation details |
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394 * for common functionality among its derived types. |
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395 */ |
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396 class PerfLongVariant : public PerfLong { |
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397 |
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398 protected: |
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399 jlong* _sampled; |
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400 PerfLongSampleHelper* _sample_helper; |
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401 |
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402 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, |
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403 jlong initial_value=0) |
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404 : PerfLong(ns, namep, u, v) { |
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405 if (is_valid()) *(jlong*)_valuep = initial_value; |
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406 } |
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407 |
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408 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, |
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409 jlong* sampled); |
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410 |
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411 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, |
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412 PerfLongSampleHelper* sample_helper); |
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413 |
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414 void sample(); |
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415 |
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416 public: |
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417 inline void inc() { (*(jlong*)_valuep)++; } |
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418 inline void inc(jlong val) { (*(jlong*)_valuep) += val; } |
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419 inline void add(jlong val) { (*(jlong*)_valuep) += val; } |
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420 }; |
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421 |
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422 /* |
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423 * The PerfLongCounter class, and its alias PerfCounter, implement |
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424 * a PerfData subtype that holds a jlong data value that can (should) |
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425 * be modified in a monotonic manner. The inc(jlong) and add(jlong) |
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426 * methods can be passed negative values to implement a monotonically |
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427 * decreasing value. However, we rely upon the programmer to honor |
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428 * the notion that this counter always moves in the same direction - |
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429 * either increasing or decreasing. |
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430 */ |
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431 class PerfLongCounter : public PerfLongVariant { |
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432 |
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433 friend class PerfDataManager; // for access to protected constructor |
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434 |
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435 protected: |
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436 |
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437 PerfLongCounter(CounterNS ns, const char* namep, Units u, |
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438 jlong initial_value=0) |
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439 : PerfLongVariant(ns, namep, u, V_Monotonic, |
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440 initial_value) { } |
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441 |
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442 PerfLongCounter(CounterNS ns, const char* namep, Units u, jlong* sampled) |
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443 : PerfLongVariant(ns, namep, u, V_Monotonic, sampled) { } |
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444 |
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445 PerfLongCounter(CounterNS ns, const char* namep, Units u, |
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446 PerfLongSampleHelper* sample_helper) |
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447 : PerfLongVariant(ns, namep, u, V_Monotonic, |
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448 sample_helper) { } |
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449 }; |
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450 |
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451 typedef PerfLongCounter PerfCounter; |
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452 |
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453 /* |
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454 * The PerfLongVariable class, and its alias PerfVariable, implement |
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455 * a PerfData subtype that holds a jlong data value that can |
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456 * be modified in an unrestricted manner. |
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457 */ |
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458 class PerfLongVariable : public PerfLongVariant { |
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459 |
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460 friend class PerfDataManager; // for access to protected constructor |
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461 |
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462 protected: |
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463 |
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464 PerfLongVariable(CounterNS ns, const char* namep, Units u, |
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465 jlong initial_value=0) |
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466 : PerfLongVariant(ns, namep, u, V_Variable, |
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467 initial_value) { } |
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468 |
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469 PerfLongVariable(CounterNS ns, const char* namep, Units u, jlong* sampled) |
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470 : PerfLongVariant(ns, namep, u, V_Variable, sampled) { } |
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471 |
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472 PerfLongVariable(CounterNS ns, const char* namep, Units u, |
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473 PerfLongSampleHelper* sample_helper) |
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474 : PerfLongVariant(ns, namep, u, V_Variable, |
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475 sample_helper) { } |
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476 |
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477 public: |
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478 inline void set_value(jlong val) { (*(jlong*)_valuep) = val; } |
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479 }; |
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480 |
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481 typedef PerfLongVariable PerfVariable; |
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482 |
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483 /* |
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484 * The PerfByteArray provides a PerfData subtype that allows the creation |
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485 * of a contiguous region of the PerfData memory region for storing a vector |
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486 * of bytes. This class is currently intended to be a base class for |
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487 * the PerfString class, and cannot be instantiated directly. |
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488 */ |
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489 class PerfByteArray : public PerfData { |
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490 |
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491 protected: |
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492 jint _length; |
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493 |
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494 PerfByteArray(CounterNS ns, const char* namep, Units u, Variability v, |
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495 jint length); |
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496 }; |
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497 |
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498 class PerfString : public PerfByteArray { |
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499 |
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500 protected: |
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501 |
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502 void set_string(const char* s2); |
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503 |
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504 PerfString(CounterNS ns, const char* namep, Variability v, jint length, |
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505 const char* initial_value) |
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506 : PerfByteArray(ns, namep, U_String, v, length) { |
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507 if (is_valid()) set_string(initial_value); |
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508 } |
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509 |
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510 public: |
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511 |
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512 int format(char* buffer, int length); |
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513 }; |
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514 |
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515 /* |
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516 * The PerfStringConstant class provides a PerfData sub class that |
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517 * allows a null terminated string of single byte characters to be |
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518 * stored in the PerfData memory region. |
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519 */ |
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520 class PerfStringConstant : public PerfString { |
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521 |
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522 friend class PerfDataManager; // for access to protected constructor |
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523 |
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524 private: |
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525 |
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526 // hide sample() - no need to sample constants |
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527 void sample() { } |
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528 |
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529 protected: |
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530 |
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531 // Restrict string constant lengths to be <= PerfMaxStringConstLength. |
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532 // This prevents long string constants, as can occur with very |
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533 // long classpaths or java command lines, from consuming too much |
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534 // PerfData memory. |
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535 PerfStringConstant(CounterNS ns, const char* namep, |
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536 const char* initial_value); |
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537 }; |
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538 |
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539 /* |
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540 * The PerfStringVariable class provides a PerfData sub class that |
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541 * allows a null terminated string of single byte character data |
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542 * to be stored in PerfData memory region. The string value can be reset |
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543 * after initialization. If the string value is >= max_length, then |
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544 * it will be truncated to max_length characters. The copied string |
|
545 * is always null terminated. |
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546 */ |
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547 class PerfStringVariable : public PerfString { |
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548 |
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549 friend class PerfDataManager; // for access to protected constructor |
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550 |
|
551 protected: |
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552 |
|
553 // sampling of string variables are not yet supported |
|
554 void sample() { } |
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555 |
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556 PerfStringVariable(CounterNS ns, const char* namep, jint max_length, |
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557 const char* initial_value) |
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558 : PerfString(ns, namep, V_Variable, max_length+1, |
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559 initial_value) { } |
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560 |
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561 public: |
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562 inline void set_value(const char* val) { set_string(val); } |
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563 }; |
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564 |
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565 |
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566 /* |
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567 * The PerfDataList class is a container class for managing lists |
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568 * of PerfData items. The intention of this class is to allow for |
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569 * alternative implementations for management of list of PerfData |
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570 * items without impacting the code that uses the lists. |
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571 * |
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572 * The initial implementation is based upon GrowableArray. Searches |
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573 * on GrowableArray types is linear in nature and this may become |
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574 * a performance issue for creation of PerfData items, particularly |
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575 * from Java code where a test for existence is implemented as a |
|
576 * search over all existing PerfData items. |
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577 * |
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578 * The abstraction is not complete. A more general container class |
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579 * would provide an Iterator abstraction that could be used to |
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580 * traverse the lists. This implementation still relys upon integer |
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581 * iterators and the at(int index) method. However, the GrowableArray |
|
582 * is not directly visible outside this class and can be replaced by |
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583 * some other implementation, as long as that implementation provides |
|
584 * a mechanism to iterate over the container by index. |
|
585 */ |
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586 class PerfDataList : public CHeapObj { |
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587 |
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588 private: |
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589 |
|
590 // GrowableArray implementation |
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591 typedef GrowableArray<PerfData*> PerfDataArray; |
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592 |
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593 PerfDataArray* _set; |
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594 |
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595 // method to search for a instrumentation object by name |
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596 static bool by_name(void* name, PerfData* pd); |
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597 |
|
598 protected: |
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599 // we expose the implementation here to facilitate the clone |
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600 // method. |
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601 PerfDataArray* get_impl() { return _set; } |
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602 |
|
603 public: |
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604 |
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605 // create a PerfDataList with the given initial length |
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606 PerfDataList(int length); |
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607 |
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608 // create a PerfDataList as a shallow copy of the given PerfDataList |
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609 PerfDataList(PerfDataList* p); |
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610 |
|
611 ~PerfDataList(); |
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612 |
|
613 // return the PerfData item indicated by name, |
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614 // or NULL if it doesn't exist. |
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615 PerfData* find_by_name(const char* name); |
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616 |
|
617 // return true if a PerfData item with the name specified in the |
|
618 // argument exists, otherwise return false. |
|
619 bool contains(const char* name) { return find_by_name(name) != NULL; } |
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620 |
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621 // return the number of PerfData items in this list |
|
622 int length() { return _set->length(); } |
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623 |
|
624 // add a PerfData item to this list |
|
625 void append(PerfData *p) { _set->append(p); } |
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626 |
|
627 // remove the given PerfData item from this list. When called |
|
628 // while iterating over the list, this method will result in a |
|
629 // change in the length of the container. The at(int index) |
|
630 // method is also impacted by this method as elements with an |
|
631 // index greater than the index of the element removed by this |
|
632 // method will be shifted down by one. |
|
633 void remove(PerfData *p) { _set->remove(p); } |
|
634 |
|
635 // create a new PerfDataList from this list. The new list is |
|
636 // a shallow copy of the original list and care should be taken |
|
637 // with respect to delete operations on the elements of the list |
|
638 // as the are likely in use by another copy of the list. |
|
639 PerfDataList* clone(); |
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640 |
|
641 // for backward compatibility with GrowableArray - need to implement |
|
642 // some form of iterator to provide a cleaner abstraction for |
|
643 // iteration over the container. |
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644 PerfData* at(int index) { return _set->at(index); } |
|
645 }; |
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646 |
|
647 |
|
648 /* |
|
649 * The PerfDataManager class is responsible for creating PerfData |
|
650 * subtypes via a set a factory methods and for managing lists |
|
651 * of the various PerfData types. |
|
652 */ |
|
653 class PerfDataManager : AllStatic { |
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654 |
|
655 friend class StatSampler; // for access to protected PerfDataList methods |
|
656 |
|
657 private: |
|
658 static PerfDataList* _all; |
|
659 static PerfDataList* _sampled; |
|
660 static PerfDataList* _constants; |
|
661 static const char* _name_spaces[]; |
|
662 |
|
663 // add a PerfData item to the list(s) of know PerfData objects |
|
664 static void add_item(PerfData* p, bool sampled); |
|
665 |
|
666 protected: |
|
667 // return the list of all known PerfData items |
|
668 static PerfDataList* all(); |
|
669 static int count() { return _all->length(); } |
|
670 |
|
671 // return the list of all known PerfData items that are to be |
|
672 // sampled by the StatSampler. |
|
673 static PerfDataList* sampled(); |
|
674 static int sampled_count() { return _sampled->length(); } |
|
675 |
|
676 // return the list of all known PerfData items that have a |
|
677 // variability classification of type Constant |
|
678 static PerfDataList* constants(); |
|
679 static int constants_count() { return _constants->length(); } |
|
680 |
|
681 public: |
|
682 |
|
683 // method to check for the existence of a PerfData item with |
|
684 // the given name. |
|
685 static bool exists(const char* name) { return _all->contains(name); } |
|
686 |
|
687 // method to map a CounterNS enumeration to a namespace string |
|
688 static const char* ns_to_string(CounterNS ns) { |
|
689 return _name_spaces[ns]; |
|
690 } |
|
691 |
|
692 // methods to test the interface stability of a given counter namespace |
|
693 // |
|
694 static bool is_stable_supported(CounterNS ns) { |
|
695 return (ns != NULL_NS) && ((ns % 3) == JAVA_NS); |
|
696 } |
|
697 static bool is_unstable_supported(CounterNS ns) { |
|
698 return (ns != NULL_NS) && ((ns % 3) == COM_NS); |
|
699 } |
|
700 static bool is_unstable_unsupported(CounterNS ns) { |
|
701 return (ns == NULL_NS) || ((ns % 3) == SUN_NS); |
|
702 } |
|
703 |
|
704 // methods to test the interface stability of a given counter name |
|
705 // |
|
706 static bool is_stable_supported(const char* name) { |
|
707 const char* javadot = "java."; |
|
708 return strncmp(name, javadot, strlen(javadot)) == 0; |
|
709 } |
|
710 static bool is_unstable_supported(const char* name) { |
|
711 const char* comdot = "com.sun."; |
|
712 return strncmp(name, comdot, strlen(comdot)) == 0; |
|
713 } |
|
714 static bool is_unstable_unsupported(const char* name) { |
|
715 return !(is_stable_supported(name) && is_unstable_supported(name)); |
|
716 } |
|
717 |
|
718 // method to construct counter name strings in a given name space. |
|
719 // The string object is allocated from the Resource Area and calls |
|
720 // to this method must be made within a ResourceMark. |
|
721 // |
|
722 static char* counter_name(const char* name_space, const char* name); |
|
723 |
|
724 // method to construct name space strings in a given name space. |
|
725 // The string object is allocated from the Resource Area and calls |
|
726 // to this method must be made within a ResourceMark. |
|
727 // |
|
728 static char* name_space(const char* name_space, const char* sub_space) { |
|
729 return counter_name(name_space, sub_space); |
|
730 } |
|
731 |
|
732 // same as above, but appends the instance number to the name space |
|
733 // |
|
734 static char* name_space(const char* name_space, const char* sub_space, |
|
735 int instance); |
|
736 static char* name_space(const char* name_space, int instance); |
|
737 |
|
738 |
|
739 // these methods provide the general interface for creating |
|
740 // performance data resources. The types of performance data |
|
741 // resources can be extended by adding additional create<type> |
|
742 // methods. |
|
743 |
|
744 // Constant Types |
|
745 static PerfStringConstant* create_string_constant(CounterNS ns, |
|
746 const char* name, |
|
747 const char *s, TRAPS); |
|
748 |
|
749 static PerfLongConstant* create_long_constant(CounterNS ns, |
|
750 const char* name, |
|
751 PerfData::Units u, |
|
752 jlong val, TRAPS); |
|
753 |
|
754 |
|
755 // Variable Types |
|
756 static PerfStringVariable* create_string_variable(CounterNS ns, |
|
757 const char* name, |
|
758 int max_length, |
|
759 const char *s, TRAPS); |
|
760 |
|
761 static PerfStringVariable* create_string_variable(CounterNS ns, |
|
762 const char* name, |
|
763 const char *s, TRAPS) { |
|
764 return create_string_variable(ns, name, 0, s, CHECK_NULL); |
|
765 }; |
|
766 |
|
767 static PerfLongVariable* create_long_variable(CounterNS ns, |
|
768 const char* name, |
|
769 PerfData::Units u, |
|
770 jlong ival, TRAPS); |
|
771 |
|
772 static PerfLongVariable* create_long_variable(CounterNS ns, |
|
773 const char* name, |
|
774 PerfData::Units u, TRAPS) { |
|
775 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); |
|
776 }; |
|
777 |
|
778 static PerfLongVariable* create_long_variable(CounterNS, const char* name, |
|
779 PerfData::Units u, |
|
780 jlong* sp, TRAPS); |
|
781 |
|
782 static PerfLongVariable* create_long_variable(CounterNS ns, |
|
783 const char* name, |
|
784 PerfData::Units u, |
|
785 PerfLongSampleHelper* sh, |
|
786 TRAPS); |
|
787 |
|
788 |
|
789 // Counter Types |
|
790 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, |
|
791 PerfData::Units u, |
|
792 jlong ival, TRAPS); |
|
793 |
|
794 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, |
|
795 PerfData::Units u, TRAPS) { |
|
796 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); |
|
797 }; |
|
798 |
|
799 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, |
|
800 PerfData::Units u, jlong* sp, |
|
801 TRAPS); |
|
802 |
|
803 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, |
|
804 PerfData::Units u, |
|
805 PerfLongSampleHelper* sh, |
|
806 TRAPS); |
|
807 |
|
808 |
|
809 // these creation methods are provided for ease of use. These allow |
|
810 // Long performance data types to be created with a shorthand syntax. |
|
811 |
|
812 static PerfConstant* create_constant(CounterNS ns, const char* name, |
|
813 PerfData::Units u, jlong val, TRAPS) { |
|
814 return create_long_constant(ns, name, u, val, CHECK_NULL); |
|
815 } |
|
816 |
|
817 static PerfVariable* create_variable(CounterNS ns, const char* name, |
|
818 PerfData::Units u, jlong ival, TRAPS) { |
|
819 return create_long_variable(ns, name, u, ival, CHECK_NULL); |
|
820 } |
|
821 |
|
822 static PerfVariable* create_variable(CounterNS ns, const char* name, |
|
823 PerfData::Units u, TRAPS) { |
|
824 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); |
|
825 } |
|
826 |
|
827 static PerfVariable* create_variable(CounterNS ns, const char* name, |
|
828 PerfData::Units u, jlong* sp, TRAPS) { |
|
829 return create_long_variable(ns, name, u, sp, CHECK_NULL); |
|
830 } |
|
831 |
|
832 static PerfVariable* create_variable(CounterNS ns, const char* name, |
|
833 PerfData::Units u, |
|
834 PerfSampleHelper* sh, TRAPS) { |
|
835 return create_long_variable(ns, name, u, sh, CHECK_NULL); |
|
836 } |
|
837 |
|
838 static PerfCounter* create_counter(CounterNS ns, const char* name, |
|
839 PerfData::Units u, jlong ival, TRAPS) { |
|
840 return create_long_counter(ns, name, u, ival, CHECK_NULL); |
|
841 } |
|
842 |
|
843 static PerfCounter* create_counter(CounterNS ns, const char* name, |
|
844 PerfData::Units u, TRAPS) { |
|
845 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); |
|
846 } |
|
847 |
|
848 static PerfCounter* create_counter(CounterNS ns, const char* name, |
|
849 PerfData::Units u, jlong* sp, TRAPS) { |
|
850 return create_long_counter(ns, name, u, sp, CHECK_NULL); |
|
851 } |
|
852 |
|
853 static PerfCounter* create_counter(CounterNS ns, const char* name, |
|
854 PerfData::Units u, |
|
855 PerfSampleHelper* sh, TRAPS) { |
|
856 return create_long_counter(ns, name, u, sh, CHECK_NULL); |
|
857 } |
|
858 |
|
859 static void destroy(); |
|
860 }; |
|
861 |
|
862 // Useful macros to create the performance counters |
|
863 #define NEWPERFTICKCOUNTER(counter, counter_ns, counter_name) \ |
|
864 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ |
|
865 PerfData::U_Ticks,CHECK);} |
|
866 |
|
867 #define NEWPERFEVENTCOUNTER(counter, counter_ns, counter_name) \ |
|
868 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ |
|
869 PerfData::U_Events,CHECK);} |
|
870 |
|
871 // Utility Classes |
|
872 |
|
873 /* |
|
874 * this class will administer a PerfCounter used as a time accumulator |
|
875 * for a basic block much like the TraceTime class. |
|
876 * |
|
877 * Example: |
|
878 * |
|
879 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, 0LL, CHECK); |
|
880 * |
|
881 * { |
|
882 * PerfTraceTime ptt(my_time_counter); |
|
883 * // perform the operation you want to measure |
|
884 * } |
|
885 * |
|
886 * Note: use of this class does not need to occur within a guarded |
|
887 * block. The UsePerfData guard is used with the implementation |
|
888 * of this class. |
|
889 */ |
|
890 class PerfTraceTime : public StackObj { |
|
891 |
|
892 protected: |
|
893 elapsedTimer _t; |
|
894 PerfLongCounter* _timerp; |
|
895 // pointer to thread-local or global recursion counter variable |
|
896 int* _recursion_counter; |
|
897 |
|
898 public: |
|
899 inline PerfTraceTime(PerfLongCounter* timerp) : _timerp(timerp), _recursion_counter(NULL) { |
|
900 if (!UsePerfData) return; |
|
901 _t.start(); |
|
902 } |
|
903 |
|
904 inline PerfTraceTime(PerfLongCounter* timerp, int* recursion_counter) : _timerp(timerp), _recursion_counter(recursion_counter) { |
|
905 if (!UsePerfData || (_recursion_counter != NULL && |
|
906 (*_recursion_counter)++ > 0)) return; |
|
907 _t.start(); |
|
908 } |
|
909 |
|
910 inline void suspend() { if (!UsePerfData) return; _t.stop(); } |
|
911 inline void resume() { if (!UsePerfData) return; _t.start(); } |
|
912 |
|
913 inline ~PerfTraceTime() { |
|
914 if (!UsePerfData || (_recursion_counter != NULL && |
|
915 --(*_recursion_counter) > 0)) return; |
|
916 _t.stop(); |
|
917 _timerp->inc(_t.ticks()); |
|
918 } |
|
919 }; |
|
920 |
|
921 /* The PerfTraceTimedEvent class is responsible for counting the |
|
922 * occurrence of some event and measuring the the elapsed time of |
|
923 * the event in two separate PerfCounter instances. |
|
924 * |
|
925 * Example: |
|
926 * |
|
927 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, CHECK); |
|
928 * static PerfCounter* my_event_counter = PerfDataManager::create_counter("my.event.counter", PerfData::U_Events, CHECK); |
|
929 * |
|
930 * { |
|
931 * PerfTraceTimedEvent ptte(my_time_counter, my_event_counter); |
|
932 * // perform the operation you want to count and measure |
|
933 * } |
|
934 * |
|
935 * Note: use of this class does not need to occur within a guarded |
|
936 * block. The UsePerfData guard is used with the implementation |
|
937 * of this class. |
|
938 * |
|
939 */ |
|
940 class PerfTraceTimedEvent : public PerfTraceTime { |
|
941 |
|
942 protected: |
|
943 PerfLongCounter* _eventp; |
|
944 |
|
945 public: |
|
946 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp): PerfTraceTime(timerp), _eventp(eventp) { |
|
947 if (!UsePerfData) return; |
|
948 _eventp->inc(); |
|
949 } |
|
950 |
|
951 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp, int* recursion_counter): PerfTraceTime(timerp, recursion_counter), _eventp(eventp) { |
|
952 if (!UsePerfData) return; |
|
953 _eventp->inc(); |
|
954 } |
|
955 }; |