1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Report CPU and I/O stats, based on sysstat version 9.1.2 by Sebastien Godard
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4 | *
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5 | * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //applet:IF_IOSTAT(APPLET(iostat, _BB_DIR_BIN, _BB_SUID_DROP))
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11 |
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12 | //kbuild:lib-$(CONFIG_IOSTAT) += iostat.o
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13 |
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14 | //config:config IOSTAT
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15 | //config: bool "iostat"
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16 | //config: default y
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17 | //config: help
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18 | //config: Report CPU and I/O statistics
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19 |
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20 | #include "libbb.h"
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21 | #include <sys/utsname.h> /* Need struct utsname */
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22 |
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23 | //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
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24 | #define debug(fmt, ...) ((void)0)
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25 |
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26 | #define MAX_DEVICE_NAME 12
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27 | #define CURRENT 0
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28 | #define LAST 1
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29 |
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30 | #if 1
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31 | typedef unsigned long long cputime_t;
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32 | typedef long long icputime_t;
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33 | # define FMT_DATA "ll"
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34 | # define CPUTIME_MAX (~0ULL)
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35 | #else
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36 | typedef unsigned long cputime_t;
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37 | typedef long icputime_t;
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38 | # define FMT_DATA "l"
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39 | # define CPUTIME_MAX (~0UL)
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40 | #endif
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41 |
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42 | struct stats_cpu {
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43 | cputime_t cpu_user;
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44 | cputime_t cpu_nice;
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45 | cputime_t cpu_system;
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46 | cputime_t cpu_idle;
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47 | cputime_t cpu_iowait;
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48 | cputime_t cpu_steal;
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49 | cputime_t cpu_irq;
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50 | cputime_t cpu_softirq;
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51 | cputime_t cpu_guest;
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52 | };
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53 |
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54 | struct stats_dev {
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55 | char dname[MAX_DEVICE_NAME];
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56 | unsigned long long rd_sectors;
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57 | unsigned long long wr_sectors;
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58 | unsigned long rd_ops;
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59 | unsigned long wr_ops;
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60 | };
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61 |
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62 | /* List of devices entered on the command line */
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63 | struct device_list {
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64 | char dname[MAX_DEVICE_NAME];
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65 | };
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66 |
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67 | /* Globals. Sort by size and access frequency. */
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68 | struct globals {
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69 | smallint show_all;
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70 | unsigned devlist_i; /* Index to the list of devices */
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71 | unsigned total_cpus; /* Number of CPUs */
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72 | unsigned clk_tck; /* Number of clock ticks per second */
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73 | struct device_list *dlist;
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74 | struct stats_dev *saved_stats_dev;
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75 | struct tm tmtime;
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76 | };
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77 | #define G (*ptr_to_globals)
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78 | #define INIT_G() do { \
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79 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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80 | } while (0)
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81 |
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82 | /* Must match option string! */
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83 | enum {
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84 | OPT_c = 1 << 0,
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85 | OPT_d = 1 << 1,
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86 | OPT_t = 1 << 2,
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87 | OPT_z = 1 << 3,
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88 | OPT_k = 1 << 4,
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89 | OPT_m = 1 << 5,
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90 | };
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91 |
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92 | static ALWAYS_INLINE unsigned get_user_hz(void)
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93 | {
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94 | return sysconf(_SC_CLK_TCK);
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95 | }
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96 |
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97 | static ALWAYS_INLINE int this_is_smp(void)
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98 | {
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99 | return (G.total_cpus > 1);
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100 | }
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101 |
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102 | static void print_header(void)
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103 | {
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104 | char buf[16];
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105 | struct utsname uts;
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106 |
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107 | if (uname(&uts) < 0)
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108 | bb_perror_msg_and_die("uname");
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109 |
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110 | strftime(buf, sizeof(buf), "%x", &G.tmtime);
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111 |
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112 | printf("%s %s (%s) \t%s \t_%s_\t(%d CPU)\n\n",
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113 | uts.sysname, uts.release, uts.nodename,
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114 | buf, uts.machine, G.total_cpus);
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115 | }
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116 |
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117 | static void get_localtime(struct tm *ptm)
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118 | {
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119 | time_t timer;
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120 | time(&timer);
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121 | localtime_r(&timer, ptm);
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122 | }
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123 |
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124 | static void print_timestamp(void)
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125 | {
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126 | char buf[20];
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127 | strftime(buf, sizeof(buf), "%x %X", &G.tmtime);
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128 | printf("%s\n", buf);
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129 | }
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130 |
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131 | /* Fetch CPU statistics from /proc/stat */
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132 | static void get_cpu_statistics(struct stats_cpu *sc)
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133 | {
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134 | FILE *fp;
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135 | char buf[1024];
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136 |
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137 | fp = xfopen_for_read("/proc/stat");
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138 |
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139 | memset(sc, 0, sizeof(*sc));
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140 |
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141 | while (fgets(buf, sizeof(buf), fp)) {
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142 | /* Does the line starts with "cpu "? */
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143 | if (starts_with_cpu(buf) && buf[3] == ' ') {
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144 | sscanf(buf + 4 + 1,
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145 | "%"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"
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146 | FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
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147 | &sc->cpu_user, &sc->cpu_nice, &sc->cpu_system,
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148 | &sc->cpu_idle, &sc->cpu_iowait, &sc->cpu_irq,
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149 | &sc->cpu_softirq, &sc->cpu_steal, &sc->cpu_guest);
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150 | }
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151 | }
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152 |
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153 | fclose(fp);
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154 | }
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155 |
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156 | static cputime_t get_smp_uptime(void)
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157 | {
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158 | FILE *fp;
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159 | char buf[sizeof(long)*3 * 2 + 4];
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160 | unsigned long sec, dec;
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161 |
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162 | fp = xfopen_for_read("/proc/uptime");
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163 |
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164 | if (fgets(buf, sizeof(buf), fp))
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165 | if (sscanf(buf, "%lu.%lu", &sec, &dec) != 2)
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166 | bb_error_msg_and_die("can't read /proc/uptime");
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167 |
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168 | fclose(fp);
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169 |
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170 | return (cputime_t)sec * G.clk_tck + dec * G.clk_tck / 100;
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171 | }
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172 |
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173 | /*
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174 | * Obtain current uptime in jiffies.
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175 | * Uptime is sum of individual CPUs' uptimes.
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176 | */
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177 | static cputime_t get_uptime(const struct stats_cpu *sc)
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178 | {
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179 | /* NB: Don't include cpu_guest, it is already in cpu_user */
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180 | return sc->cpu_user + sc->cpu_nice + sc->cpu_system + sc->cpu_idle +
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181 | + sc->cpu_iowait + sc->cpu_irq + sc->cpu_steal + sc->cpu_softirq;
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182 | }
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183 |
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184 | static ALWAYS_INLINE cputime_t get_interval(cputime_t old, cputime_t new)
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185 | {
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186 | cputime_t itv = new - old;
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187 |
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188 | return (itv == 0) ? 1 : itv;
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189 | }
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190 |
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191 | #if CPUTIME_MAX > 0xffffffff
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192 | /*
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193 | * Handle overflow conditions properly for counters which can have
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194 | * less bits than cputime_t, depending on the kernel version.
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195 | */
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196 | /* Surprisingly, on 32bit inlining is a size win */
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197 | static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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198 | {
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199 | cputime_t v = curr - prev;
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200 |
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201 | if ((icputime_t)v < 0 /* curr < prev - counter overflow? */
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202 | && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
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203 | ) {
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204 | /* Add 33th bit set to 1 to curr, compensating for the overflow */
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205 | /* double shift defeats "warning: left shift count >= width of type" */
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206 | v += ((cputime_t)1 << 16) << 16;
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207 | }
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208 | return v;
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209 | }
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210 | #else
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211 | static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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212 | {
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213 | return curr - prev;
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214 | }
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215 | #endif
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216 |
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217 | static double percent_value(cputime_t prev, cputime_t curr, cputime_t itv)
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218 | {
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219 | return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
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220 | }
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221 |
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222 | static void print_stats_cpu_struct(const struct stats_cpu *p,
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223 | const struct stats_cpu *c, cputime_t itv)
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224 | {
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225 | printf(" %6.2f %6.2f %6.2f %6.2f %6.2f %6.2f\n",
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226 | percent_value(p->cpu_user , c->cpu_user , itv),
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227 | percent_value(p->cpu_nice , c->cpu_nice , itv),
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228 | percent_value(p->cpu_system + p->cpu_softirq + p->cpu_irq,
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229 | c->cpu_system + c->cpu_softirq + c->cpu_irq, itv),
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230 | percent_value(p->cpu_iowait , c->cpu_iowait , itv),
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231 | percent_value(p->cpu_steal , c->cpu_steal , itv),
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232 | percent_value(p->cpu_idle , c->cpu_idle , itv)
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233 | );
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234 | }
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235 |
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236 | static void print_stats_dev_struct(const struct stats_dev *p,
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237 | const struct stats_dev *c, cputime_t itv)
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238 | {
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239 | int unit = 1;
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240 |
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241 | if (option_mask32 & OPT_k)
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242 | unit = 2;
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243 | else if (option_mask32 & OPT_m)
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244 | unit = 2048;
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245 |
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246 | if (option_mask32 & OPT_z)
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247 | if (p->rd_ops == c->rd_ops && p->wr_ops == c->wr_ops)
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248 | return;
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249 |
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250 | printf("%-13s", c->dname);
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251 | printf(" %8.2f %12.2f %12.2f %10llu %10llu \n",
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252 | percent_value(p->rd_ops + p->wr_ops ,
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253 | /**/ c->rd_ops + c->wr_ops , itv),
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254 | percent_value(p->rd_sectors, c->rd_sectors, itv) / unit,
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255 | percent_value(p->wr_sectors, c->wr_sectors, itv) / unit,
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256 | (c->rd_sectors - p->rd_sectors) / unit,
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257 | (c->wr_sectors - p->wr_sectors) / unit);
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258 | }
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259 |
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260 | static void cpu_report(const struct stats_cpu *last,
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261 | const struct stats_cpu *cur,
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262 | cputime_t itv)
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263 | {
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264 | /* Always print a header */
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265 | puts("avg-cpu: %user %nice %system %iowait %steal %idle");
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266 |
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267 | /* Print current statistics */
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268 | print_stats_cpu_struct(last, cur, itv);
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269 | }
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270 |
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271 | static void print_devstat_header(void)
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272 | {
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273 | printf("Device: tps");
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274 |
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275 | if (option_mask32 & OPT_m)
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276 | puts(" MB_read/s MB_wrtn/s MB_read MB_wrtn");
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277 | else if (option_mask32 & OPT_k)
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278 | puts(" kB_read/s kB_wrtn/s kB_read kB_wrtn");
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279 | else
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280 | puts(" Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn");
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281 | }
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282 |
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283 | /*
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284 | * Is input partition of format [sdaN]?
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285 | */
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286 | static int is_partition(const char *dev)
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287 | {
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288 | /* Ok, this is naive... */
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289 | return ((dev[0] - 's') | (dev[1] - 'd') | (dev[2] - 'a')) == 0 && isdigit(dev[3]);
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290 | }
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291 |
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292 | /*
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293 | * Return number of numbers on cmdline.
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294 | * Reasonable values are only 0 (no interval/count specified),
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295 | * 1 (interval specified) and 2 (both interval and count specified)
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296 | */
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297 | static int numbers_on_cmdline(int argc, char *argv[])
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298 | {
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299 | int sum = 0;
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300 |
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301 | if (isdigit(argv[argc-1][0]))
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302 | sum++;
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303 | if (argc > 2 && isdigit(argv[argc-2][0]))
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304 | sum++;
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305 |
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306 | return sum;
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307 | }
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308 |
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309 | static int is_dev_in_dlist(const char *dev)
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310 | {
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311 | int i;
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312 |
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313 | /* Go through the device list */
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314 | for (i = 0; i < G.devlist_i; i++)
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315 | if (strcmp(G.dlist[i].dname, dev) == 0)
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316 | /* Found a match */
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317 | return 1;
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318 |
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319 | /* No match found */
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320 | return 0;
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321 | }
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322 |
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323 | static void do_disk_statistics(cputime_t itv)
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324 | {
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325 | FILE *fp;
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326 | int rc;
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327 | int i = 0;
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328 | char buf[128];
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329 | unsigned major, minor;
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330 | unsigned long wr_ops, dummy; /* %*lu for suppress the conversion wouldn't work */
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331 | unsigned long long rd_sec_or_wr_ops;
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332 | unsigned long long rd_sec_or_dummy, wr_sec_or_dummy, wr_sec;
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333 | struct stats_dev sd;
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334 |
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335 | fp = xfopen_for_read("/proc/diskstats");
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336 |
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337 | /* Read and possibly print stats from /proc/diskstats */
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338 | while (fgets(buf, sizeof(buf), fp)) {
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339 | rc = sscanf(buf, "%u %u %s %lu %llu %llu %llu %lu %lu %llu %lu %lu %lu %lu",
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340 | &major, &minor, sd.dname, &sd.rd_ops,
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341 | &rd_sec_or_dummy, &rd_sec_or_wr_ops, &wr_sec_or_dummy,
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342 | &wr_ops, &dummy, &wr_sec, &dummy, &dummy, &dummy, &dummy);
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343 |
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344 | switch (rc) {
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345 | case 14:
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346 | sd.wr_ops = wr_ops;
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347 | sd.rd_sectors = rd_sec_or_wr_ops;
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348 | sd.wr_sectors = wr_sec;
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349 | break;
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350 | case 7:
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351 | sd.rd_sectors = rd_sec_or_dummy;
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352 | sd.wr_ops = (unsigned long)rd_sec_or_wr_ops;
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353 | sd.wr_sectors = wr_sec_or_dummy;
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354 | break;
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355 | default:
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356 | break;
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357 | }
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358 |
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359 | if (!G.devlist_i && !is_partition(sd.dname)) {
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360 | /* User didn't specify device */
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361 | if (!G.show_all && !sd.rd_ops && !sd.wr_ops) {
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362 | /* Don't print unused device */
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363 | continue;
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364 | }
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365 | print_stats_dev_struct(&G.saved_stats_dev[i], &sd, itv);
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366 | G.saved_stats_dev[i] = sd;
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367 | i++;
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368 | } else {
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369 | /* Is device in device list? */
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370 | if (is_dev_in_dlist(sd.dname)) {
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371 | /* Print current statistics */
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372 | print_stats_dev_struct(&G.saved_stats_dev[i], &sd, itv);
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373 | G.saved_stats_dev[i] = sd;
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374 | i++;
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375 | } else
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376 | continue;
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377 | }
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378 | }
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379 |
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380 | fclose(fp);
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381 | }
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382 |
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383 | static void dev_report(cputime_t itv)
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384 | {
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385 | /* Always print a header */
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386 | print_devstat_header();
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387 |
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388 | /* Fetch current disk statistics */
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389 | do_disk_statistics(itv);
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390 | }
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391 |
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392 | static void save_to_devlist(const char *dname)
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393 | {
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394 | int i;
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395 | struct device_list *tmp = G.dlist;
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396 |
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397 | if (strncmp(dname, "/dev/", 5) == 0)
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398 | /* We'll ignore prefix '/dev/' */
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399 | dname += 5;
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400 |
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401 | /* Go through the list */
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402 | for (i = 0; i < G.devlist_i; i++, tmp++)
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403 | if (strcmp(tmp->dname, dname) == 0)
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404 | /* Already in the list */
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405 | return;
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406 |
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407 | /* Add device name to the list */
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408 | strncpy(tmp->dname, dname, MAX_DEVICE_NAME - 1);
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409 |
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410 | /* Update device list index */
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411 | G.devlist_i++;
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412 | }
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413 |
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414 | static unsigned get_number_of_devices(void)
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415 | {
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416 | FILE *fp;
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417 | char buf[128];
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418 | int rv;
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419 | unsigned n = 0;
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420 | unsigned long rd_ops, wr_ops;
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421 | char dname[MAX_DEVICE_NAME];
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422 |
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423 | fp = xfopen_for_read("/proc/diskstats");
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424 |
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425 | while (fgets(buf, sizeof(buf), fp)) {
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426 | rv = sscanf(buf, "%*d %*d %s %lu %*u %*u %*u %lu",
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427 | dname, &rd_ops, &wr_ops);
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428 | if (rv == 2 || is_partition(dname))
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429 | /* A partition */
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430 | continue;
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431 | if (!rd_ops && !wr_ops) {
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432 | /* Unused device */
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433 | if (!G.show_all)
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434 | continue;
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435 | }
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436 | n++;
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437 | }
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438 |
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439 | fclose(fp);
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440 | return n;
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441 | }
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442 |
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443 | static int number_of_ALL_on_cmdline(char **argv)
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444 | {
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445 | int alls = 0;
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446 |
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447 | /* Iterate over cmd line arguments, count "ALL" */
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448 | while (*argv)
|
---|
449 | if (strcmp(*argv++, "ALL") == 0)
|
---|
450 | alls++;
|
---|
451 |
|
---|
452 | return alls;
|
---|
453 | }
|
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454 |
|
---|
455 | //usage:#define iostat_trivial_usage
|
---|
456 | //usage: "[-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]"
|
---|
457 | //usage:#define iostat_full_usage "\n\n"
|
---|
458 | //usage: "Report CPU and I/O statistics\n"
|
---|
459 | //usage: "\nOptions:"
|
---|
460 | //usage: "\n -c Show CPU utilization"
|
---|
461 | //usage: "\n -d Show device utilization"
|
---|
462 | //usage: "\n -t Print current time"
|
---|
463 | //usage: "\n -z Omit devices with no activity"
|
---|
464 | //usage: "\n -k Use kb/s"
|
---|
465 | //usage: "\n -m Use Mb/s"
|
---|
466 |
|
---|
467 | int iostat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
468 | int iostat_main(int argc, char **argv)
|
---|
469 | {
|
---|
470 | int opt, dev_num;
|
---|
471 | unsigned interval = 0;
|
---|
472 | int count;
|
---|
473 | cputime_t global_uptime[2] = { 0 };
|
---|
474 | cputime_t smp_uptime[2] = { 0 };
|
---|
475 | cputime_t itv;
|
---|
476 | struct stats_cpu stats_cur, stats_last;
|
---|
477 |
|
---|
478 | INIT_G();
|
---|
479 |
|
---|
480 | memset(&stats_last, 0, sizeof(stats_last));
|
---|
481 |
|
---|
482 | /* Get number of clock ticks per sec */
|
---|
483 | G.clk_tck = get_user_hz();
|
---|
484 |
|
---|
485 | /* Determine number of CPUs */
|
---|
486 | G.total_cpus = get_cpu_count();
|
---|
487 | if (G.total_cpus == 0)
|
---|
488 | G.total_cpus = 1;
|
---|
489 |
|
---|
490 | /* Parse and process arguments */
|
---|
491 | /* -k and -m are mutually exclusive */
|
---|
492 | opt_complementary = "k--m:m--k";
|
---|
493 | opt = getopt32(argv, "cdtzkm");
|
---|
494 | if (!(opt & (OPT_c + OPT_d)))
|
---|
495 | /* Default is -cd */
|
---|
496 | opt |= OPT_c + OPT_d;
|
---|
497 |
|
---|
498 | argv += optind;
|
---|
499 | argc -= optind;
|
---|
500 |
|
---|
501 | dev_num = argc - numbers_on_cmdline(argc, argv);
|
---|
502 | /* We don't want to allocate space for 'ALL' */
|
---|
503 | dev_num -= number_of_ALL_on_cmdline(argv);
|
---|
504 | if (dev_num > 0)
|
---|
505 | /* Make space for device list */
|
---|
506 | G.dlist = xzalloc(sizeof(G.dlist[0]) * dev_num);
|
---|
507 |
|
---|
508 | /* Store device names into device list */
|
---|
509 | while (*argv && !isdigit(*argv[0])) {
|
---|
510 | if (strcmp(*argv, "ALL") != 0)
|
---|
511 | /* If not ALL, save device name */
|
---|
512 | save_to_devlist(*argv);
|
---|
513 | else
|
---|
514 | G.show_all = 1;
|
---|
515 | argv++;
|
---|
516 | }
|
---|
517 |
|
---|
518 | count = 1;
|
---|
519 | if (*argv) {
|
---|
520 | /* Get interval */
|
---|
521 | interval = xatoi_positive(*argv);
|
---|
522 | count = (interval != 0 ? -1 : 1);
|
---|
523 | argv++;
|
---|
524 | if (*argv)
|
---|
525 | /* Get count value */
|
---|
526 | count = xatoi_positive(*argv);
|
---|
527 | }
|
---|
528 |
|
---|
529 | /* Allocate space for device stats */
|
---|
530 | if (opt & OPT_d) {
|
---|
531 | G.saved_stats_dev = xzalloc(sizeof(G.saved_stats_dev[0]) *
|
---|
532 | (dev_num ? dev_num : get_number_of_devices())
|
---|
533 | );
|
---|
534 | }
|
---|
535 |
|
---|
536 | /* Display header */
|
---|
537 | print_header();
|
---|
538 |
|
---|
539 | /* Main loop */
|
---|
540 | for (;;) {
|
---|
541 | /* Fill the time structure */
|
---|
542 | get_localtime(&G.tmtime);
|
---|
543 |
|
---|
544 | /* Fetch current CPU statistics */
|
---|
545 | get_cpu_statistics(&stats_cur);
|
---|
546 |
|
---|
547 | /* Fetch current uptime */
|
---|
548 | global_uptime[CURRENT] = get_uptime(&stats_cur);
|
---|
549 |
|
---|
550 | /* Get interval */
|
---|
551 | itv = get_interval(global_uptime[LAST], global_uptime[CURRENT]);
|
---|
552 |
|
---|
553 | if (opt & OPT_t)
|
---|
554 | print_timestamp();
|
---|
555 |
|
---|
556 | if (opt & OPT_c) {
|
---|
557 | cpu_report(&stats_last, &stats_cur, itv);
|
---|
558 | if (opt & OPT_d)
|
---|
559 | /* Separate outputs by a newline */
|
---|
560 | bb_putchar('\n');
|
---|
561 | }
|
---|
562 |
|
---|
563 | if (opt & OPT_d) {
|
---|
564 | if (this_is_smp()) {
|
---|
565 | smp_uptime[CURRENT] = get_smp_uptime();
|
---|
566 | itv = get_interval(smp_uptime[LAST], smp_uptime[CURRENT]);
|
---|
567 | smp_uptime[LAST] = smp_uptime[CURRENT];
|
---|
568 | }
|
---|
569 | dev_report(itv);
|
---|
570 | }
|
---|
571 |
|
---|
572 | if (count > 0) {
|
---|
573 | if (--count == 0)
|
---|
574 | break;
|
---|
575 | }
|
---|
576 |
|
---|
577 | /* Backup current stats */
|
---|
578 | global_uptime[LAST] = global_uptime[CURRENT];
|
---|
579 | stats_last = stats_cur;
|
---|
580 |
|
---|
581 | bb_putchar('\n');
|
---|
582 | sleep(interval);
|
---|
583 | }
|
---|
584 |
|
---|
585 | bb_putchar('\n');
|
---|
586 |
|
---|
587 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
588 | free(&G);
|
---|
589 | free(G.dlist);
|
---|
590 | free(G.saved_stats_dev);
|
---|
591 | }
|
---|
592 |
|
---|
593 | return EXIT_SUCCESS;
|
---|
594 | }
|
---|