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annotate toys/vmstat.c @ 595:d8566c3321f0 0.3.0

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Multiplexer needs stayroot flag for suid handling.
author Rob Landley <rob@landley.net>
date Mon, 11 Jun 2012 23:57:16 -0500
parents 4d802d438983
children
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * vmstat.c - Report virtual memory statistics.
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4 *
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5 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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6 *
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7 * Not in SUSv4.
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8
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9 USE_VMSTAT(NEWTOY(vmstat, ">2n", TOYFLAG_BIN))
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10
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11 config VMSTAT
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12 bool "vmstat"
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13 default y
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14 help
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15 usage: vmstat [-n] [delay [count]]
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16 -n Display the header only once
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17 delay The delay between updates in seconds, when not specified
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18 the average since boot is displayed.
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19 count Number of updates to display, the default is inifinite.
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20 */
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21
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22 #include "toys.h"
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23
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24 void read_proc_stat(unsigned int * proc_running, unsigned int * proc_blocked,
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25 uint64_t * sys_irq, uint64_t * sys_ctxt,
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26 uint64_t * cpu_user, uint64_t * cpu_sys, uint64_t * cpu_idle, uint64_t * cpu_wait)
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27 {
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28 char * off;
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29 uint64_t c_user, c_nice, c_sys, c_irq, c_sirq;
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30 int fd = xopen("/proc/stat", O_RDONLY);
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31 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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32 toybuf[s] = 0;
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33 if ( s == sizeof(toybuf)-1)
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34 error_exit("/proc/stat is too large");
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35
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36 off = strstr(toybuf, "cpu ");
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37 // Ignoring steal and guest fields for now.
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38 if (off) sscanf(off, "cpu %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64 \
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39 " %"PRIu64" %"PRIu64" %"PRIu64, &c_user, &c_nice, &c_sys, cpu_idle,
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40 cpu_wait, &c_irq, &c_sirq);
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41 *cpu_user = c_user + c_nice;
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42 *cpu_sys = c_sys + c_irq + c_sirq;
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43 off = strstr(toybuf, "intr");
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44 if (off) sscanf(off, "intr %"PRIu64, sys_irq);
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45
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46 off = strstr(toybuf, "ctxt");
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47 if (off) sscanf(off, "ctxt %"PRIu64, sys_ctxt);
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48
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49 off = strstr(toybuf, "procs_running");
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50 if (off) sscanf(off, "procs_running %u", proc_running);
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51 (*proc_running)--; // look, i'm invisible.
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52
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53 off = strstr(toybuf, "procs_blocked");
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54 if (off) sscanf(off, "procs_blocked %u", proc_blocked);
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55
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56 close(fd);
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57 }
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58
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59 void read_proc_meminfo(unsigned long * mem_swapped, unsigned long * mem_free,
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60 unsigned long * mem_buff, unsigned long * mem_cache)
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61 {
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62 char * off;
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63 unsigned long swap_total, swap_free;
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64 int fd = xopen("/proc/meminfo", O_RDONLY);
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65 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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66 toybuf[s] = 0;
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67 if ( s == sizeof(toybuf)-1)
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68 error_exit("/proc/meminfo is too large");
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69
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70 off = strstr(toybuf, "MemFree");
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71 if (off) sscanf(off, "MemFree: %lu kB", mem_free);
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72
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73 off = strstr(toybuf, "Buffers");
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74 if (off) sscanf(off, "Buffers: %lu kB", mem_buff);
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75
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76 off = strstr(toybuf, "Cached");
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77 if (off) sscanf(off, "Cached: %lu kB", mem_cache);
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78
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79 off = strstr(toybuf, "SwapFree");
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80 if (off) sscanf(off, "SwapFree: %lu kB", &swap_free);
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81
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82 off = strstr(toybuf, "SwapTotal");
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83 if (off) sscanf(off, "SwapTotal: %lu kB", &swap_total);
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84 *mem_swapped = swap_total - swap_free;
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85
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86 close(fd);
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87 }
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88
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89 void read_proc_vmstat(unsigned long * io_pages_in, unsigned long * io_pages_out,
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90 unsigned long * swap_bytes_in, unsigned long * swap_bytes_out)
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91 {
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92 char * off;
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93 unsigned long s_pages_in, s_pages_out;
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94 unsigned long pagesize_kb = sysconf(_SC_PAGESIZE) / 1024L;
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95 int fd = xopen("/proc/vmstat", O_RDONLY);
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96 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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97 toybuf[s] = 0;
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98 if ( s == sizeof(toybuf)-1)
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99 error_exit("/proc/vmstat is too large");
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100
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101 off = strstr(toybuf, "pgpgin");
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102 if (off) sscanf(off, "pgpgin %lu", io_pages_in);
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103
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104 off = strstr(toybuf, "pgpgout");
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105 if (off) sscanf(off, "pgpgout %lu", io_pages_out);
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106
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107 off = strstr(toybuf, "pswpin");
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108 if (off) sscanf(off, "pswpin %lu", &s_pages_in);
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109 *swap_bytes_in = s_pages_in * pagesize_kb;
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110
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111 off = strstr(toybuf, "pswpout");
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112 if (off) sscanf(off, "pswpout %lu", &s_pages_out);
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113 *swap_bytes_out = s_pages_out * pagesize_kb;
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114
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115 close(fd);
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116 }
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117
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118 void vmstat_main(void)
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119 {
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120 const char fmt[] = "%2u %2u %6lu %6lu %6lu %6lu %4u %4u %5u %5u %4u %4u %2u %2u %2u %2u\n";
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121 unsigned int loop_num = 0, loop_max_num = 0, loop_delay = 0;
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122 unsigned int running = 0, blocked = 0;
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123 unsigned long mem_swap = 0, mem_free = 0, mem_buff = 0, mem_cache = 0;
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124 unsigned long io_pages_in[2], io_pages_out[2], swap_bytes_in[2], swap_bytes_out[2];
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125 uint64_t sys_irq[2], sys_ctxt[2], cpu_user[2], cpu_sys[2], cpu_idle[2], cpu_wait[2];
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126 int first_run = 1;
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127 int no_header = toys.optflags & 0x1;
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128 unsigned num_rows = 22;
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129
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130 if (toys.optc >= 1)
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131 loop_delay = atoi(toys.optargs[0]);
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132 if (toys.optc >= 2)
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133 loop_max_num = atoi(toys.optargs[1]);
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134
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135 if (loop_max_num < 0 || loop_delay < 0)
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136 error_exit("Invalid arguments");
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137
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138 while(1) {
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139 uint64_t total_jif;
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140 int idx = loop_num%2;
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141
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142 if(first_run || (!(loop_num % num_rows) && !no_header)) {
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143 unsigned rows = 0, cols = 0;
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144 terminal_size(&cols, &rows);
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145 num_rows = (rows > 3)? rows - 3 : 22;
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146 printf("procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----\n");
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147 printf(" r b swpd free buff cache si so bi bo in cs us sy id wa\n");
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148 }
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149
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150 read_proc_stat(&running, &blocked, &sys_irq[idx], &sys_ctxt[idx], &cpu_user[idx],
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151 &cpu_sys[idx], &cpu_idle[idx], &cpu_wait[idx]);
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152 read_proc_meminfo(&mem_swap, &mem_free, &mem_buff, &mem_cache);
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153 read_proc_vmstat(&io_pages_in[idx], &io_pages_out[idx], &swap_bytes_in[idx], &swap_bytes_out[idx]);
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154
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155 if (first_run) {
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156 struct sysinfo inf;
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157 sysinfo(&inf);
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158 first_run = 0;
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159 total_jif = cpu_user[idx] + cpu_idle[idx] + cpu_wait[idx];
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160 printf(fmt, running, blocked, mem_swap, mem_free, mem_buff, mem_cache,
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161 (unsigned) (swap_bytes_in[idx]/inf.uptime),
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162 (unsigned) (swap_bytes_out[idx]/inf.uptime),
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163 (unsigned) (io_pages_in[idx]/inf.uptime),
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164 (unsigned) (io_pages_out[idx]/inf.uptime),
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165 (unsigned) (sys_irq[idx]/inf.uptime),
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166 (unsigned) (sys_ctxt[idx]/inf.uptime),
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167 (unsigned) (100*cpu_user[idx]/total_jif),
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168 (unsigned) (100*cpu_sys[idx]/total_jif),
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169 (unsigned) (100*cpu_idle[idx]/total_jif),
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170 (unsigned) (100*cpu_wait[idx]/total_jif));
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171 }else{
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172 total_jif = cpu_user[idx] - cpu_user[!idx] + cpu_idle[idx] - cpu_idle[!idx] + cpu_wait[idx] - cpu_wait[!idx];
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173 printf(fmt, running, blocked, mem_swap, mem_free, mem_buff, mem_cache,
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174 (unsigned) ((swap_bytes_in[idx] - swap_bytes_in[!idx])/loop_delay),
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175 (unsigned) ((swap_bytes_out[idx] - swap_bytes_out[!idx])/loop_delay),
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176 (unsigned) ((io_pages_in[idx] - io_pages_in[!idx])/loop_delay),
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177 (unsigned) ((io_pages_out[idx] - io_pages_out[!idx])/loop_delay),
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178 (unsigned) ((sys_irq[idx] - sys_irq[!idx])/loop_delay),
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179 (unsigned) ((sys_ctxt[idx] - sys_ctxt[!idx])/loop_delay),
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180 (unsigned) (100*(cpu_user[idx] - cpu_user[!idx])/total_jif),
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181 (unsigned) (100*(cpu_sys[idx] - cpu_sys[!idx]) /total_jif),
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182 (unsigned) (100*(cpu_idle[idx] - cpu_idle[!idx])/total_jif),
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183 (unsigned) (100*(cpu_wait[idx] - cpu_wait[!idx])/total_jif));
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184 }
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185
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186 loop_num++;
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187 if (loop_delay == 0 || (loop_max_num != 0 && loop_num >= loop_max_num))
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188 break;
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189 sleep(loop_delay);
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190 }
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191 }