annotate toys/other/vmstat.c @ 1008:a55854bde872

su: cleanery * make help message more like others * s/TT\.(.)Argu/TT.\1/g * move environ to toys.h * simplify failure messages * clear password before quit * not check what execve returns * -lc
author Strake <strake888@gmail.com>
date Sat, 17 Aug 2013 02:54:58 -0500
parents 786841fdb1e0
children a7df29f72bc6
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1 /* vmstat.c - Report virtual memory statistics.
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2 *
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3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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4
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5 USE_VMSTAT(NEWTOY(vmstat, ">2n", TOYFLAG_BIN))
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6
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7 config VMSTAT
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8 bool "vmstat"
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9 default y
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10 help
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11 usage: vmstat [-n] [delay [count]]
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12 -n Display the header only once
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13 delay The delay between updates in seconds, when not specified
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14 the average since boot is displayed.
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15 count Number of updates to display, the default is inifinite.
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16 */
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17
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18 #include "toys.h"
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20 void read_proc_stat(unsigned int *proc_running, unsigned int *proc_blocked,
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21 uint64_t *sys_irq, uint64_t *sys_ctxt, uint64_t *cpu_user, uint64_t *cpu_sys,
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22 uint64_t *cpu_idle, uint64_t *cpu_wait)
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23 {
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24 char * off;
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25 uint64_t c_user, c_nice, c_sys, c_irq, c_sirq;
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26 int fd = xopen("/proc/stat", O_RDONLY);
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27 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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29 toybuf[s] = 0;
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30 if (s == sizeof(toybuf)-1) error_exit("/proc/stat is too large");
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32 off = strstr(toybuf, "cpu ");
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33 // Ignoring steal and guest fields for now.
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34 if (off) sscanf(off, "cpu %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64 \
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35 " %"PRIu64" %"PRIu64" %"PRIu64, &c_user, &c_nice, &c_sys, cpu_idle,
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36 cpu_wait, &c_irq, &c_sirq);
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37 *cpu_user = c_user + c_nice;
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38 *cpu_sys = c_sys + c_irq + c_sirq;
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39 off = strstr(toybuf, "intr");
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40 if (off) sscanf(off, "intr %"PRIu64, sys_irq);
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42 off = strstr(toybuf, "ctxt");
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43 if (off) sscanf(off, "ctxt %"PRIu64, sys_ctxt);
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45 off = strstr(toybuf, "procs_running");
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46 if (off) sscanf(off, "procs_running %u", proc_running);
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47 (*proc_running)--; // look, i'm invisible.
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49 off = strstr(toybuf, "procs_blocked");
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50 if (off) sscanf(off, "procs_blocked %u", proc_blocked);
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52 close(fd);
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53 }
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55 void read_proc_meminfo(unsigned long *mem_swapped, unsigned long *mem_free,
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56 unsigned long *mem_buff, unsigned long *mem_cache)
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57 {
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58 char * off;
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59 unsigned long swap_total, swap_free;
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60 int fd = xopen("/proc/meminfo", O_RDONLY);
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61 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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63 toybuf[s] = 0;
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64 if (s == sizeof(toybuf)-1) error_exit("/proc/meminfo is too large");
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66 off = strstr(toybuf, "MemFree");
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67 if (off) sscanf(off, "MemFree: %lu kB", mem_free);
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69 off = strstr(toybuf, "Buffers");
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70 if (off) sscanf(off, "Buffers: %lu kB", mem_buff);
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72 off = strstr(toybuf, "Cached");
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73 if (off) sscanf(off, "Cached: %lu kB", mem_cache);
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75 off = strstr(toybuf, "SwapFree");
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76 if (off) sscanf(off, "SwapFree: %lu kB", &swap_free);
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78 off = strstr(toybuf, "SwapTotal");
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79 if (off) sscanf(off, "SwapTotal: %lu kB", &swap_total);
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80 *mem_swapped = swap_total - swap_free;
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82 close(fd);
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83 }
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85 void read_proc_vmstat(unsigned long *io_pages_in, unsigned long *io_pages_out,
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86 unsigned long *swap_bytes_in, unsigned long *swap_bytes_out)
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87 {
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88 char *off;
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89 unsigned long s_pages_in, s_pages_out;
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90 unsigned long pagesize_kb = sysconf(_SC_PAGESIZE) / 1024L;
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91 int fd = xopen("/proc/vmstat", O_RDONLY);
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92 size_t s = xread(fd, toybuf, sizeof(toybuf)-1);
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93
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94 toybuf[s] = 0;
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95 if (s == sizeof(toybuf)-1) error_exit("/proc/vmstat is too large");
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96
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97 off = strstr(toybuf, "pgpgin");
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98 if (off) sscanf(off, "pgpgin %lu", io_pages_in);
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99
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100 off = strstr(toybuf, "pgpgout");
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101 if (off) sscanf(off, "pgpgout %lu", io_pages_out);
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102
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103 off = strstr(toybuf, "pswpin");
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104 if (off) sscanf(off, "pswpin %lu", &s_pages_in);
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105 *swap_bytes_in = s_pages_in * pagesize_kb;
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106
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107 off = strstr(toybuf, "pswpout");
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108 if (off) sscanf(off, "pswpout %lu", &s_pages_out);
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109 *swap_bytes_out = s_pages_out * pagesize_kb;
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110
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111 close(fd);
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112 }
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113
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114 void vmstat_main(void)
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115 {
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116 const char fmt[] = "%2u %2u %6lu %6lu %6lu %6lu %4u %4u %5u %5u %4u %4u %2u %2u %2u %2u\n";
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117 unsigned int loop_num = 0, loop_max_num = 0, loop_delay = 0;
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118 unsigned int running = 0, blocked = 0;
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119 unsigned long mem_swap = 0, mem_free = 0, mem_buff = 0, mem_cache = 0;
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120 unsigned long io_pages_in[2], io_pages_out[2], swap_bytes_in[2], swap_bytes_out[2];
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121 uint64_t sys_irq[2], sys_ctxt[2], cpu_user[2], cpu_sys[2], cpu_idle[2], cpu_wait[2];
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122 int first_run = 1;
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123 int no_header = toys.optflags;
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124 unsigned num_rows = 22;
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125
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126 if (toys.optc >= 1) loop_delay = atoi(toys.optargs[0]);
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127 if (toys.optc >= 2) loop_max_num = atoi(toys.optargs[1]);
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128
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129 if (loop_max_num < 0 || loop_delay < 0) error_exit("Invalid arguments");
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130
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131 while(1) {
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132 uint64_t total_jif;
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133 int idx = loop_num%2;
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134
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135 if(first_run || (!(loop_num % num_rows) && !no_header)) {
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136 unsigned rows = 0, cols = 0;
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137 terminal_size(&cols, &rows);
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138 num_rows = (rows > 3)? rows - 3 : 22;
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139 printf("procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----\n");
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140 printf(" r b swpd free buff cache si so bi bo in cs us sy id wa\n");
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141 }
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142
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143 read_proc_stat(&running, &blocked, &sys_irq[idx], &sys_ctxt[idx], &cpu_user[idx],
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144 &cpu_sys[idx], &cpu_idle[idx], &cpu_wait[idx]);
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145 read_proc_meminfo(&mem_swap, &mem_free, &mem_buff, &mem_cache);
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146 read_proc_vmstat(&io_pages_in[idx], &io_pages_out[idx], &swap_bytes_in[idx], &swap_bytes_out[idx]);
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147
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148 if (first_run) {
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149 struct sysinfo inf;
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150 sysinfo(&inf);
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151 first_run = 0;
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152 total_jif = cpu_user[idx] + cpu_idle[idx] + cpu_wait[idx];
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153 printf(fmt, running, blocked, mem_swap, mem_free, mem_buff, mem_cache,
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154 (unsigned) (swap_bytes_in[idx]/inf.uptime),
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155 (unsigned) (swap_bytes_out[idx]/inf.uptime),
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156 (unsigned) (io_pages_in[idx]/inf.uptime),
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157 (unsigned) (io_pages_out[idx]/inf.uptime),
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158 (unsigned) (sys_irq[idx]/inf.uptime),
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159 (unsigned) (sys_ctxt[idx]/inf.uptime),
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160 (unsigned) (100*cpu_user[idx]/total_jif),
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161 (unsigned) (100*cpu_sys[idx]/total_jif),
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162 (unsigned) (100*cpu_idle[idx]/total_jif),
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163 (unsigned) (100*cpu_wait[idx]/total_jif));
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164 }else{
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165 total_jif = cpu_user[idx] - cpu_user[!idx] + cpu_idle[idx] - cpu_idle[!idx] + cpu_wait[idx] - cpu_wait[!idx];
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166 printf(fmt, running, blocked, mem_swap, mem_free, mem_buff, mem_cache,
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167 (unsigned) ((swap_bytes_in[idx] - swap_bytes_in[!idx])/loop_delay),
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168 (unsigned) ((swap_bytes_out[idx] - swap_bytes_out[!idx])/loop_delay),
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169 (unsigned) ((io_pages_in[idx] - io_pages_in[!idx])/loop_delay),
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170 (unsigned) ((io_pages_out[idx] - io_pages_out[!idx])/loop_delay),
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171 (unsigned) ((sys_irq[idx] - sys_irq[!idx])/loop_delay),
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172 (unsigned) ((sys_ctxt[idx] - sys_ctxt[!idx])/loop_delay),
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173 (unsigned) (100*(cpu_user[idx] - cpu_user[!idx])/total_jif),
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174 (unsigned) (100*(cpu_sys[idx] - cpu_sys[!idx]) /total_jif),
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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175 (unsigned) (100*(cpu_idle[idx] - cpu_idle[!idx])/total_jif),
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Rob Landley <rob@landley.net>
parents: 674
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176 (unsigned) (100*(cpu_wait[idx] - cpu_wait[!idx])/total_jif));
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Rob Landley <rob@landley.net>
parents: 674
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177 }
561
c97e338a4126 toybuf usage enhancement, tabs to spaces, teminal height refresh
Elie De Brauwer <eliedebrauwer@gmail.com>
parents: 559
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178
694
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Rob Landley <rob@landley.net>
parents: 674
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179 loop_num++;
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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180 if (loop_delay == 0 || (loop_max_num != 0 && loop_num >= loop_max_num))
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Rob Landley <rob@landley.net>
parents: 674
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181 break;
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Rob Landley <rob@landley.net>
parents: 674
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182 sleep(loop_delay);
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Rob Landley <rob@landley.net>
parents: 674
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183 }
559
120b3dde7cf4 Adding vmstat
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
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184 }