1 /* |
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2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 #include <stdio.h> |
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27 #include <stdint.h> |
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28 #include <stdarg.h> |
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29 #include <unistd.h> |
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30 #include <errno.h> |
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31 #include <string.h> |
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32 #include <sys/resource.h> |
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33 #include <sys/types.h> |
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34 #include <dirent.h> |
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35 #include <stdlib.h> |
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36 #include <dlfcn.h> |
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37 #include <pthread.h> |
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38 #include <inttypes.h> |
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39 #include "sun_management_OperatingSystemImpl.h" |
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40 |
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41 struct ticks { |
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42 uint64_t used; |
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43 uint64_t usedKernel; |
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44 uint64_t total; |
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45 }; |
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46 |
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47 typedef struct ticks ticks; |
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48 |
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49 typedef enum { |
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50 CPU_LOAD_VM_ONLY, |
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51 CPU_LOAD_GLOBAL, |
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52 } CpuLoadTarget; |
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53 |
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54 static struct perfbuf { |
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55 int nProcs; |
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56 ticks jvmTicks; |
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57 ticks cpuTicks; |
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58 ticks *cpus; |
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59 } counters; |
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60 |
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61 #define DEC_64 "%"SCNd64 |
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62 |
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63 static void next_line(FILE *f) { |
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64 while (fgetc(f) != '\n'); |
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65 } |
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66 |
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67 /** |
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68 * Return the total number of ticks since the system was booted. |
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69 * If the usedTicks parameter is not NULL, it will be filled with |
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70 * the number of ticks spent on actual processes (user, system or |
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71 * nice processes) since system boot. Note that this is the total number |
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72 * of "executed" ticks on _all_ CPU:s, that is on a n-way system it is |
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73 * n times the number of ticks that has passed in clock time. |
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74 * |
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75 * Returns a negative value if the reading of the ticks failed. |
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76 */ |
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77 static int get_totalticks(int which, ticks *pticks) { |
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78 FILE *fh; |
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79 uint64_t userTicks, niceTicks, systemTicks, idleTicks; |
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80 int n; |
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81 |
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82 if((fh = fopen("/proc/stat", "r")) == NULL) { |
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83 return -1; |
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84 } |
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85 |
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86 n = fscanf(fh, "cpu " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64, |
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87 &userTicks, &niceTicks, &systemTicks, &idleTicks); |
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88 |
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89 // Move to next line |
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90 next_line(fh); |
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91 |
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92 //find the line for requested cpu faster to just iterate linefeeds? |
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93 if (which != -1) { |
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94 int i; |
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95 for (i = 0; i < which; i++) { |
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96 if (fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64, &userTicks, &niceTicks, &systemTicks, &idleTicks) != 4) { |
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97 fclose(fh); |
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98 return -2; |
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99 } |
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100 next_line(fh); |
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101 } |
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102 n = fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 "\n", |
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103 &userTicks, &niceTicks, &systemTicks, &idleTicks); |
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104 } |
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105 |
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106 fclose(fh); |
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107 if (n != 4) { |
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108 return -2; |
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109 } |
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110 |
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111 pticks->used = userTicks + niceTicks; |
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112 pticks->usedKernel = systemTicks; |
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113 pticks->total = userTicks + niceTicks + systemTicks + idleTicks; |
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114 |
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115 return 0; |
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116 } |
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117 |
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118 static int vread_statdata(const char *procfile, const char *fmt, va_list args) { |
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119 FILE *f; |
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120 int n; |
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121 char buf[2048]; |
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122 |
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123 if ((f = fopen(procfile, "r")) == NULL) { |
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124 return -1; |
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125 } |
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126 |
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127 if ((n = fread(buf, 1, sizeof(buf), f)) != -1) { |
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128 char *tmp; |
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129 |
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130 buf[n-1] = '\0'; |
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131 /** skip through pid and exec name. the exec name _could be wacky_ (renamed) and |
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132 * make scanf go mupp. |
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133 */ |
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134 if ((tmp = strrchr(buf, ')')) != NULL) { |
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135 // skip the ')' and the following space but check that the buffer is long enough |
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136 tmp += 2; |
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137 if (tmp < buf + n) { |
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138 n = vsscanf(tmp, fmt, args); |
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139 } |
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140 } |
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141 } |
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142 |
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143 fclose(f); |
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144 |
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145 return n; |
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146 } |
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147 |
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148 static int read_statdata(const char *procfile, const char *fmt, ...) { |
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149 int n; |
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150 va_list args; |
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151 |
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152 va_start(args, fmt); |
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153 n = vread_statdata(procfile, fmt, args); |
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154 va_end(args); |
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155 return n; |
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156 } |
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157 |
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158 /** read user and system ticks from a named procfile, assumed to be in 'stat' format then. */ |
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159 static int read_ticks(const char *procfile, uint64_t *userTicks, uint64_t *systemTicks) { |
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160 return read_statdata(procfile, "%*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u "DEC_64" "DEC_64, |
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161 userTicks, systemTicks |
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162 ); |
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163 } |
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164 |
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165 /** |
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166 * Return the number of ticks spent in any of the processes belonging |
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167 * to the JVM on any CPU. |
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168 */ |
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169 static int get_jvmticks(ticks *pticks) { |
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170 uint64_t userTicks; |
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171 uint64_t systemTicks; |
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172 |
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173 if (read_ticks("/proc/self/stat", &userTicks, &systemTicks) < 0) { |
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174 return -1; |
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175 } |
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176 |
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177 // get the total |
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178 if (get_totalticks(-1, pticks) < 0) { |
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179 return -1; |
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180 } |
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181 |
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182 pticks->used = userTicks; |
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183 pticks->usedKernel = systemTicks; |
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184 |
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185 return 0; |
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186 } |
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187 |
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188 /** |
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189 * This method must be called first, before any data can be gathererd. |
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190 */ |
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191 int perfInit() { |
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192 static int initialized=1; |
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193 |
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194 if (!initialized) { |
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195 int i; |
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196 |
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197 int n = sysconf(_SC_NPROCESSORS_ONLN); |
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198 if (n <= 0) { |
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199 n = 1; |
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200 } |
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201 |
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202 counters.cpus = calloc(n,sizeof(ticks)); |
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203 if (counters.cpus != NULL) { |
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204 // For the CPU load |
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205 get_totalticks(-1, &counters.cpuTicks); |
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206 |
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207 for (i = 0; i < n; i++) { |
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208 get_totalticks(i, &counters.cpus[i]); |
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209 } |
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210 // For JVM load |
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211 get_jvmticks(&counters.jvmTicks); |
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212 initialized = 1; |
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213 } |
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214 } |
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215 |
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216 return initialized ? 0 : -1; |
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217 } |
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218 |
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219 #define MAX(a,b) (a>b?a:b) |
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220 #define MIN(a,b) (a<b?a:b) |
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221 |
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222 static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
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223 |
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224 /** |
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225 * Return the load of the CPU as a double. 1.0 means the CPU process uses all |
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226 * available time for user or system processes, 0.0 means the CPU uses all time |
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227 * being idle. |
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228 * |
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229 * Returns a negative value if there is a problem in determining the CPU load. |
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230 */ |
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231 |
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232 static double get_cpuload_internal(int which, double *pkernelLoad, CpuLoadTarget target) { |
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233 uint64_t udiff, kdiff, tdiff; |
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234 ticks *pticks, tmp; |
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235 double user_load = -1.0; |
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236 int failed = 0; |
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237 |
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238 *pkernelLoad = 0.0; |
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239 |
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240 pthread_mutex_lock(&lock); |
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241 |
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242 if(perfInit() == 0) { |
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243 |
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244 if (target == CPU_LOAD_VM_ONLY) { |
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245 pticks = &counters.jvmTicks; |
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246 } else if (which == -1) { |
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247 pticks = &counters.cpuTicks; |
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248 } else { |
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249 pticks = &counters.cpus[which]; |
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250 } |
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251 |
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252 tmp = *pticks; |
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253 |
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254 if (target == CPU_LOAD_VM_ONLY) { |
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255 if (get_jvmticks(pticks) != 0) { |
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256 failed = 1; |
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257 } |
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258 } else if (get_totalticks(which, pticks) < 0) { |
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259 failed = 1; |
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260 } |
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261 |
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262 if(!failed) { |
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263 // seems like we sometimes end up with less kernel ticks when |
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264 // reading /proc/self/stat a second time, timing issue between cpus? |
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265 if (pticks->usedKernel < tmp.usedKernel) { |
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266 kdiff = 0; |
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267 } else { |
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268 kdiff = pticks->usedKernel - tmp.usedKernel; |
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269 } |
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270 tdiff = pticks->total - tmp.total; |
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271 udiff = pticks->used - tmp.used; |
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272 |
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273 if (tdiff == 0) { |
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274 user_load = 0; |
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275 } else { |
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276 if (tdiff < (udiff + kdiff)) { |
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277 tdiff = udiff + kdiff; |
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278 } |
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279 *pkernelLoad = (kdiff / (double)tdiff); |
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280 // BUG9044876, normalize return values to sane values |
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281 *pkernelLoad = MAX(*pkernelLoad, 0.0); |
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282 *pkernelLoad = MIN(*pkernelLoad, 1.0); |
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283 |
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284 user_load = (udiff / (double)tdiff); |
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285 user_load = MAX(user_load, 0.0); |
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286 user_load = MIN(user_load, 1.0); |
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287 } |
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288 } |
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289 } |
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290 pthread_mutex_unlock(&lock); |
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291 return user_load; |
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292 } |
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293 |
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294 double get_cpu_load(int which) { |
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295 double u, s; |
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296 u = get_cpuload_internal(which, &s, CPU_LOAD_GLOBAL); |
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297 if (u < 0) { |
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298 return -1.0; |
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299 } |
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300 // Cap total systemload to 1.0 |
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301 return MIN((u + s), 1.0); |
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302 } |
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303 |
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304 double get_process_load() { |
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305 double u, s; |
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306 u = get_cpuload_internal(-1, &s, CPU_LOAD_VM_ONLY); |
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307 if (u < 0) { |
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308 return -1.0; |
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309 } |
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310 return u + s; |
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311 } |
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312 |
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313 JNIEXPORT jdouble JNICALL |
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314 Java_sun_management_OperatingSystemImpl_getSystemCpuLoad0 |
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315 (JNIEnv *env, jobject dummy) |
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316 { |
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317 if(perfInit() == 0) { |
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318 return get_cpu_load(-1); |
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319 } else { |
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320 return -1.0; |
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321 } |
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322 } |
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323 |
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324 JNIEXPORT jdouble JNICALL |
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325 Java_sun_management_OperatingSystemImpl_getProcessCpuLoad0 |
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326 (JNIEnv *env, jobject dummy) |
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327 { |
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328 if(perfInit() == 0) { |
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329 return get_process_load(); |
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330 } else { |
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331 return -1.0; |
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332 } |
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333 } |
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