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 | //config:config IOSTAT
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11 | //config: bool "iostat"
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12 | //config: default y
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13 | //config: help
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14 | //config: Report CPU and I/O statistics
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15 |
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16 | //applet:IF_IOSTAT(APPLET(iostat, BB_DIR_BIN, BB_SUID_DROP))
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17 |
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18 | //kbuild:lib-$(CONFIG_IOSTAT) += iostat.o
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19 |
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20 | #include "libbb.h"
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21 | #include <sys/utsname.h> /* 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 MAX_DEVICE_NAME_STR "12"
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28 |
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29 | #if 1
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30 | typedef unsigned long long cputime_t;
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31 | typedef long long icputime_t;
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32 | # define FMT_DATA "ll"
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33 | # define CPUTIME_MAX (~0ULL)
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34 | #else
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35 | typedef unsigned long cputime_t;
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36 | typedef long icputime_t;
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37 | # define FMT_DATA "l"
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38 | # define CPUTIME_MAX (~0UL)
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39 | #endif
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40 |
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41 | enum {
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42 | STATS_CPU_USER,
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43 | STATS_CPU_NICE,
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44 | STATS_CPU_SYSTEM,
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45 | STATS_CPU_IDLE,
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46 | STATS_CPU_IOWAIT,
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47 | STATS_CPU_IRQ,
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48 | STATS_CPU_SOFTIRQ,
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49 | STATS_CPU_STEAL,
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50 | STATS_CPU_GUEST,
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51 |
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52 | GLOBAL_UPTIME,
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53 | SMP_UPTIME,
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54 |
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55 | N_STATS_CPU,
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56 | };
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57 |
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58 | typedef struct {
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59 | cputime_t vector[N_STATS_CPU];
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60 | } stats_cpu_t;
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61 |
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62 | typedef struct {
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63 | stats_cpu_t *prev;
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64 | stats_cpu_t *curr;
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65 | cputime_t itv;
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66 | } stats_cpu_pair_t;
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67 |
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68 | typedef struct {
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69 | unsigned long long rd_sectors;
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70 | unsigned long long wr_sectors;
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71 | unsigned long rd_ops;
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72 | unsigned long wr_ops;
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73 | } stats_dev_data_t;
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74 |
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75 | typedef struct stats_dev {
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76 | struct stats_dev *next;
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77 | char dname[MAX_DEVICE_NAME + 1];
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78 | stats_dev_data_t prev_data;
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79 | stats_dev_data_t curr_data;
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80 | } stats_dev_t;
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81 |
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82 | /* Globals. Sort by size and access frequency. */
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83 | struct globals {
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84 | smallint show_all;
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85 | unsigned total_cpus; /* Number of CPUs */
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86 | unsigned clk_tck; /* Number of clock ticks per second */
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87 | llist_t *dev_name_list; /* List of devices entered on the command line */
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88 | stats_dev_t *stats_dev_list;
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89 | struct tm tmtime;
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90 | struct {
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91 | const char *str;
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92 | unsigned div;
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93 | } unit;
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94 | };
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95 | #define G (*ptr_to_globals)
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96 | #define INIT_G() do { \
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97 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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98 | G.unit.str = "Blk"; \
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99 | G.unit.div = 1; \
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100 | } while (0)
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101 |
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102 | /* Must match option string! */
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103 | enum {
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104 | OPT_c = 1 << 0,
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105 | OPT_d = 1 << 1,
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106 | OPT_t = 1 << 2,
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107 | OPT_z = 1 << 3,
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108 | OPT_k = 1 << 4,
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109 | OPT_m = 1 << 5,
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110 | };
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111 |
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112 | static ALWAYS_INLINE int this_is_smp(void)
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113 | {
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114 | return (G.total_cpus > 1);
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115 | }
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116 |
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117 | static void print_header(void)
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118 | {
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119 | char buf[32];
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120 | struct utsname uts;
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121 |
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122 | uname(&uts); /* never fails */
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123 |
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124 | /* Date representation for the current locale */
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125 | strftime(buf, sizeof(buf), "%x", &G.tmtime);
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126 |
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127 | printf("%s %s (%s) \t%s \t_%s_\t(%u CPU)\n\n",
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128 | uts.sysname, uts.release, uts.nodename,
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129 | buf, uts.machine, G.total_cpus);
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130 | }
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131 |
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132 | static void get_localtime(struct tm *ptm)
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133 | {
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134 | time_t timer;
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135 | time(&timer);
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136 | localtime_r(&timer, ptm);
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137 | }
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138 |
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139 | static void print_timestamp(void)
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140 | {
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141 | char buf[64];
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142 | /* %x: date representation for the current locale */
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143 | /* %X: time representation for the current locale */
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144 | strftime(buf, sizeof(buf), "%x %X", &G.tmtime);
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145 | puts(buf);
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146 | }
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147 |
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148 | static cputime_t get_smp_uptime(void)
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149 | {
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150 | FILE *fp;
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151 | unsigned long sec, dec;
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152 |
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153 | fp = xfopen_for_read("/proc/uptime");
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154 |
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155 | if (fscanf(fp, "%lu.%lu", &sec, &dec) != 2)
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156 | bb_error_msg_and_die("can't read '%s'", "/proc/uptime");
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157 |
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158 | fclose(fp);
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159 |
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160 | return (cputime_t)sec * G.clk_tck + dec * G.clk_tck / 100;
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161 | }
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162 |
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163 | /* Fetch CPU statistics from /proc/stat */
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164 | static void get_cpu_statistics(stats_cpu_t *sc)
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165 | {
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166 | FILE *fp;
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167 | char buf[1024];
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168 |
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169 | fp = xfopen_for_read("/proc/stat");
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170 |
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171 | memset(sc, 0, sizeof(*sc));
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172 |
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173 | while (fgets(buf, sizeof(buf), fp)) {
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174 | int i;
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175 | char *ibuf;
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176 |
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177 | /* Does the line start with "cpu "? */
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178 | if (!starts_with_cpu(buf) || buf[3] != ' ') {
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179 | continue;
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180 | }
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181 | ibuf = buf + 4;
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182 | for (i = STATS_CPU_USER; i <= STATS_CPU_GUEST; i++) {
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183 | ibuf = skip_whitespace(ibuf);
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184 | sscanf(ibuf, "%"FMT_DATA"u", &sc->vector[i]);
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185 | if (i != STATS_CPU_GUEST) {
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186 | sc->vector[GLOBAL_UPTIME] += sc->vector[i];
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187 | }
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188 | ibuf = skip_non_whitespace(ibuf);
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189 | }
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190 | break;
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191 | }
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192 |
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193 | if (this_is_smp()) {
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194 | sc->vector[SMP_UPTIME] = get_smp_uptime();
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195 | }
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196 |
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197 | fclose(fp);
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198 | }
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199 |
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200 | static ALWAYS_INLINE cputime_t get_interval(cputime_t old, cputime_t new)
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201 | {
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202 | cputime_t itv = new - old;
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203 |
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204 | return (itv == 0) ? 1 : itv;
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205 | }
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206 |
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207 | #if CPUTIME_MAX > 0xffffffff
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208 | /*
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209 | * Handle overflow conditions properly for counters which can have
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210 | * less bits than cputime_t, depending on the kernel version.
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211 | */
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212 | /* Surprisingly, on 32bit inlining is a size win */
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213 | static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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214 | {
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215 | cputime_t v = curr - prev;
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216 |
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217 | if ((icputime_t)v < 0 /* curr < prev - counter overflow? */
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218 | && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
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219 | ) {
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220 | /* Add 33th bit set to 1 to curr, compensating for the overflow */
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221 | /* double shift defeats "warning: left shift count >= width of type" */
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222 | v += ((cputime_t)1 << 16) << 16;
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223 | }
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224 | return v;
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225 | }
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226 | #else
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227 | static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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228 | {
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229 | return curr - prev;
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230 | }
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231 | #endif
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232 |
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233 | static double percent_value(cputime_t prev, cputime_t curr, cputime_t itv)
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234 | {
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235 | return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
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236 | }
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237 |
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238 | static void print_stats_cpu_struct(stats_cpu_pair_t *stats)
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239 | {
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240 | cputime_t *p = stats->prev->vector;
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241 | cputime_t *c = stats->curr->vector;
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242 | printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
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243 | percent_value(p[STATS_CPU_USER] , c[STATS_CPU_USER] , stats->itv),
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244 | percent_value(p[STATS_CPU_NICE] , c[STATS_CPU_NICE] , stats->itv),
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245 | percent_value(p[STATS_CPU_SYSTEM] + p[STATS_CPU_SOFTIRQ] + p[STATS_CPU_IRQ],
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246 | c[STATS_CPU_SYSTEM] + c[STATS_CPU_SOFTIRQ] + c[STATS_CPU_IRQ], stats->itv),
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247 | percent_value(p[STATS_CPU_IOWAIT], c[STATS_CPU_IOWAIT], stats->itv),
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248 | percent_value(p[STATS_CPU_STEAL] , c[STATS_CPU_STEAL] , stats->itv),
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249 | percent_value(p[STATS_CPU_IDLE] , c[STATS_CPU_IDLE] , stats->itv)
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250 | );
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251 | }
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252 |
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253 | static void cpu_report(stats_cpu_pair_t *stats)
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254 | {
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255 | /* Always print a header */
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256 | puts("avg-cpu: %user %nice %system %iowait %steal %idle");
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257 |
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258 | /* Print current statistics */
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259 | print_stats_cpu_struct(stats);
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260 | }
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261 |
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262 | static void print_stats_dev_struct(stats_dev_t *stats_dev, cputime_t itv)
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263 | {
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264 | stats_dev_data_t *p = &stats_dev->prev_data;
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265 | stats_dev_data_t *c = &stats_dev->curr_data;
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266 | if (option_mask32 & OPT_z)
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267 | if (p->rd_ops == c->rd_ops && p->wr_ops == c->wr_ops)
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268 | return;
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269 |
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270 | printf("%-13s %8.2f %12.2f %12.2f %10llu %10llu\n",
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271 | stats_dev->dname,
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272 | percent_value(p->rd_ops + p->wr_ops, c->rd_ops + c->wr_ops, itv),
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273 | percent_value(p->rd_sectors, c->rd_sectors, itv) / G.unit.div,
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274 | percent_value(p->wr_sectors, c->wr_sectors, itv) / G.unit.div,
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275 | (c->rd_sectors - p->rd_sectors) / G.unit.div,
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276 | (c->wr_sectors - p->wr_sectors) / G.unit.div
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277 | );
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278 | }
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279 |
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280 | static void print_devstat_header(void)
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281 | {
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282 | printf("Device:%15s%6s%s/s%6s%s/s%6s%s%6s%s\n",
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283 | "tps",
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284 | G.unit.str, "_read", G.unit.str, "_wrtn",
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285 | G.unit.str, "_read", G.unit.str, "_wrtn"
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286 | );
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287 | }
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288 |
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289 | /*
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290 | * Is input partition of format [sdaN]?
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291 | */
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292 | static int is_partition(const char *dev)
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293 | {
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294 | /* Ok, this is naive... */
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295 | return ((dev[0] - 's') | (dev[1] - 'd') | (dev[2] - 'a')) == 0 && isdigit(dev[3]);
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296 | }
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297 |
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298 | static stats_dev_t *stats_dev_find_or_new(const char *dev_name)
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299 | {
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300 | stats_dev_t **curr = &G.stats_dev_list;
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301 |
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302 | while (*curr != NULL) {
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303 | if (strcmp((*curr)->dname, dev_name) == 0)
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304 | return *curr;
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305 | curr = &(*curr)->next;
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306 | }
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307 |
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308 | *curr = xzalloc(sizeof(stats_dev_t));
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309 | strncpy((*curr)->dname, dev_name, MAX_DEVICE_NAME);
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310 | return *curr;
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311 | }
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312 |
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313 | static void stats_dev_free(stats_dev_t *stats_dev)
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314 | {
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315 | if (stats_dev) {
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316 | stats_dev_free(stats_dev->next);
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317 | free(stats_dev);
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318 | }
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319 | }
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320 |
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321 | static void do_disk_statistics(cputime_t itv)
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322 | {
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323 | char buf[128];
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324 | char dev_name[MAX_DEVICE_NAME + 1];
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325 | unsigned long long rd_sec_or_dummy;
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326 | unsigned long long wr_sec_or_dummy;
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327 | stats_dev_data_t *curr_data;
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328 | stats_dev_t *stats_dev;
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329 | FILE *fp;
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330 | int rc;
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331 |
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332 | fp = xfopen_for_read("/proc/diskstats");
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333 | /* Read and possibly print stats from /proc/diskstats */
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334 | while (fgets(buf, sizeof(buf), fp)) {
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335 | sscanf(buf, "%*s %*s %"MAX_DEVICE_NAME_STR"s", dev_name);
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336 | if (G.dev_name_list) {
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337 | /* Is device name in list? */
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338 | if (!llist_find_str(G.dev_name_list, dev_name))
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339 | continue;
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340 | } else if (is_partition(dev_name)) {
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341 | continue;
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342 | }
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343 |
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344 | stats_dev = stats_dev_find_or_new(dev_name);
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345 | curr_data = &stats_dev->curr_data;
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346 |
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347 | rc = sscanf(buf, "%*s %*s %*s %lu %llu %llu %llu %lu %*s %llu",
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348 | &curr_data->rd_ops,
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349 | &rd_sec_or_dummy,
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350 | &curr_data->rd_sectors,
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351 | &wr_sec_or_dummy,
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352 | &curr_data->wr_ops,
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353 | &curr_data->wr_sectors);
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354 | if (rc != 6) {
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355 | curr_data->rd_sectors = rd_sec_or_dummy;
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356 | curr_data->wr_sectors = wr_sec_or_dummy;
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357 | //curr_data->rd_ops = ;
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358 | curr_data->wr_ops = (unsigned long)curr_data->rd_sectors;
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359 | }
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360 |
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361 | if (!G.dev_name_list /* User didn't specify device */
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362 | && !G.show_all
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363 | && curr_data->rd_ops == 0
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364 | && curr_data->wr_ops == 0
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365 | ) {
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366 | /* Don't print unused device */
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367 | continue;
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368 | }
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369 |
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370 | /* Print current statistics */
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371 | print_stats_dev_struct(stats_dev, itv);
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372 | stats_dev->prev_data = *curr_data;
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373 | }
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374 |
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375 | fclose(fp);
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376 | }
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377 |
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378 | static void dev_report(cputime_t itv)
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379 | {
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380 | /* Always print a header */
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381 | print_devstat_header();
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382 |
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383 | /* Fetch current disk statistics */
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384 | do_disk_statistics(itv);
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385 | }
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386 |
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387 | //usage:#define iostat_trivial_usage
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388 | //usage: "[-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]"
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389 | //usage:#define iostat_full_usage "\n\n"
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390 | //usage: "Report CPU and I/O statistics\n"
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391 | //usage: "\n -c Show CPU utilization"
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392 | //usage: "\n -d Show device utilization"
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393 | //usage: "\n -t Print current time"
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394 | //usage: "\n -z Omit devices with no activity"
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395 | //usage: "\n -k Use kb/s"
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396 | //usage: "\n -m Use Mb/s"
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397 |
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398 | int iostat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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399 | int iostat_main(int argc UNUSED_PARAM, char **argv)
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400 | {
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401 | int opt;
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402 | unsigned interval;
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403 | int count;
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404 | stats_cpu_t stats_data[2];
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405 | smallint current_stats;
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406 |
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407 | INIT_G();
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408 |
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409 | memset(&stats_data, 0, sizeof(stats_data));
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410 |
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411 | /* Get number of clock ticks per sec */
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412 | G.clk_tck = bb_clk_tck();
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413 |
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414 | /* Determine number of CPUs */
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415 | G.total_cpus = get_cpu_count();
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416 | if (G.total_cpus == 0)
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417 | G.total_cpus = 1;
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418 |
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419 | /* Parse and process arguments */
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420 | /* -k and -m are mutually exclusive */
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421 | opt_complementary = "k--m:m--k";
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422 | opt = getopt32(argv, "cdtzkm");
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423 | if (!(opt & (OPT_c + OPT_d)))
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424 | /* Default is -cd */
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425 | opt |= OPT_c + OPT_d;
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426 |
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427 | argv += optind;
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428 |
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429 | /* Store device names into device list */
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430 | while (*argv && !isdigit(*argv[0])) {
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431 | if (strcmp(*argv, "ALL") != 0) {
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432 | /* If not ALL, save device name */
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433 | char *dev_name = skip_dev_pfx(*argv);
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434 | if (!llist_find_str(G.dev_name_list, dev_name)) {
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435 | llist_add_to(&G.dev_name_list, dev_name);
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436 | }
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437 | } else {
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438 | G.show_all = 1;
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439 | }
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440 | argv++;
|
---|
441 | }
|
---|
442 |
|
---|
443 | interval = 0;
|
---|
444 | count = 1;
|
---|
445 | if (*argv) {
|
---|
446 | /* Get interval */
|
---|
447 | interval = xatoi_positive(*argv);
|
---|
448 | count = (interval != 0 ? -1 : 1);
|
---|
449 | argv++;
|
---|
450 | if (*argv)
|
---|
451 | /* Get count value */
|
---|
452 | count = xatoi_positive(*argv);
|
---|
453 | }
|
---|
454 |
|
---|
455 | if (opt & OPT_m) {
|
---|
456 | G.unit.str = " MB";
|
---|
457 | G.unit.div = 2048;
|
---|
458 | }
|
---|
459 |
|
---|
460 | if (opt & OPT_k) {
|
---|
461 | G.unit.str = " kB";
|
---|
462 | G.unit.div = 2;
|
---|
463 | }
|
---|
464 |
|
---|
465 | get_localtime(&G.tmtime);
|
---|
466 |
|
---|
467 | /* Display header */
|
---|
468 | print_header();
|
---|
469 |
|
---|
470 | current_stats = 0;
|
---|
471 | /* Main loop */
|
---|
472 | for (;;) {
|
---|
473 | stats_cpu_pair_t stats;
|
---|
474 |
|
---|
475 | stats.prev = &stats_data[current_stats ^ 1];
|
---|
476 | stats.curr = &stats_data[current_stats];
|
---|
477 |
|
---|
478 | /* Fill the time structure */
|
---|
479 | get_localtime(&G.tmtime);
|
---|
480 |
|
---|
481 | /* Fetch current CPU statistics */
|
---|
482 | get_cpu_statistics(stats.curr);
|
---|
483 |
|
---|
484 | /* Get interval */
|
---|
485 | stats.itv = get_interval(
|
---|
486 | stats.prev->vector[GLOBAL_UPTIME],
|
---|
487 | stats.curr->vector[GLOBAL_UPTIME]
|
---|
488 | );
|
---|
489 |
|
---|
490 | if (opt & OPT_t)
|
---|
491 | print_timestamp();
|
---|
492 |
|
---|
493 | if (opt & OPT_c) {
|
---|
494 | cpu_report(&stats);
|
---|
495 | if (opt & OPT_d)
|
---|
496 | /* Separate outputs by a newline */
|
---|
497 | bb_putchar('\n');
|
---|
498 | }
|
---|
499 |
|
---|
500 | if (opt & OPT_d) {
|
---|
501 | if (this_is_smp()) {
|
---|
502 | stats.itv = get_interval(
|
---|
503 | stats.prev->vector[SMP_UPTIME],
|
---|
504 | stats.curr->vector[SMP_UPTIME]
|
---|
505 | );
|
---|
506 | }
|
---|
507 | dev_report(stats.itv);
|
---|
508 | }
|
---|
509 |
|
---|
510 | bb_putchar('\n');
|
---|
511 |
|
---|
512 | if (count > 0) {
|
---|
513 | if (--count == 0)
|
---|
514 | break;
|
---|
515 | }
|
---|
516 |
|
---|
517 | /* Swap stats */
|
---|
518 | current_stats ^= 1;
|
---|
519 |
|
---|
520 | sleep(interval);
|
---|
521 | }
|
---|
522 |
|
---|
523 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
524 | llist_free(G.dev_name_list, NULL);
|
---|
525 | stats_dev_free(G.stats_dev_list);
|
---|
526 | free(&G);
|
---|
527 | }
|
---|
528 |
|
---|
529 | return EXIT_SUCCESS;
|
---|
530 | }
|
---|