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annotate toys/other/vmstat.c @ 1211:40e0f7b09b77 draft

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Fix two bugs reported by Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Fri, 28 Feb 2014 23:04:57 -0600
parents a7df29f72bc6
children 6eee35009294
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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13 Print virtual memory statistics, repeating each DELAY seconds, COUNT times.
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14 (With no DELAY, prints one line. With no COUNT, repeats until killed.)
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15
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16 Show processes running and blocked, kilobytes swapped, free, buffered, and
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17 cached, kilobytes swapped in and out per second, file disk blocks input and
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18 output per second, interrupts and context switches per second, percent
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19 of CPU time spent running user code, system code, idle, and awaiting I/O.
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20 First line is since system started, later lines are since last line.
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21
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22 -n Display the header only once
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23 */
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24
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25 #define FOR_vmstat
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26 #include "toys.h"
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27
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28 struct vmstat_proc {
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29 // From /proc/stat (jiffies)
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30 uint64_t user, nice, sys, idle, wait, irq, sirq, intr, ctxt, running, blocked;
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31 // From /proc/meminfo (units are kb)
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32 uint64_t memfree, buffers, cached, swapfree, swaptotal;
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33 // From /proc/vmstat (units are pages)
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34 uint64_t io_in, io_out, swap_in, swap_out;
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35 };
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36
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37 // All the elements of vmstat_proc are the same size, so we can populate it as
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38 // a big array, then read the elements back out by name
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39 void get_vmstat_proc(struct vmstat_proc *vmstat_proc)
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40 {
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41 char *vmstuff[] = { "/proc/stat", "cpu ", 0, 0, 0, 0, 0, 0,
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42 "intr ", "ctxt ", "procs_running ", "procs_blocked ", "/proc/meminfo",
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43 "MemFree: ", "Buffers: ", "Cached: ", "SwapFree: ", "SwapTotal: ",
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44 "/proc/vmstat", "pgpgin ", "pgpgout ", "pswpin ", "pswpout " };
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45 uint64_t *new = (uint64_t *)vmstat_proc;
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46 char *p = p, *name = name;
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47 int i, j;
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48
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49 // We use vmstuff to fill out vmstat_proc as an array of uint64_t:
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50 // Strings starting with / are the file to find next entries in
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51 // Any other string is a key to search for, with decimal value right after
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52 // 0 means parse another value on same line as last key
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53
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54 for (i = 0; i<sizeof(vmstuff)/sizeof(char *); i++) {
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55 if (!vmstuff[i]) p++;
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56 else if (*vmstuff[i] == '/') {
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57 xreadfile(name = vmstuff[i], toybuf, sizeof(toybuf));
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58
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59 continue;
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60 } else {
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61 if (!(p = strstr(toybuf, vmstuff[i]))) goto error;
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62 p += strlen(vmstuff[i]);
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63 }
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64 if (1 != sscanf(p, "%"PRIu64"%n", new++, &j)) goto error;
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65 p += j;
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66 }
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67
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68 return;
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69
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70 error:
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71 error_exit("No %sin %s\n", vmstuff[i], name);
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72 }
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73
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74 void vmstat_main(void)
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75 {
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76 struct vmstat_proc top[2];
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77 int i, loop_delay = 0, loop_max = 0;
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78 unsigned loop, rows = (toys.optflags & FLAG_n) ? 0 : 25,
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79 page_kb = sysconf(_SC_PAGESIZE)/1024;
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80 char *headers="r\0b\0swpd\0free\0buff\0cache\0si\0so\0bi\0bo\0in\0cs\0us\0"
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81 "sy\0id\0wa", lengths[] = {2,2,6,6,6,6,4,4,5,5,4,4,2,2,2,2};
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82
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83 memset(top, 0, sizeof(top));
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84 if (toys.optc) loop_delay = atolx_range(toys.optargs[0], 0, INT_MAX);
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85 if (toys.optc > 1) loop_max = atolx_range(toys.optargs[1], 1, INT_MAX) - 1;
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86
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87 for (loop = 0; loop <= loop_max; loop++) {
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88 unsigned idx = loop&1, offset = 0, expected = 0;
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89 uint64_t units, total_hz, *ptr = (uint64_t *)(top+idx),
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90 *oldptr = (uint64_t *)(top+!idx);
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91
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92 // Print headers
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93 if (rows>3 && !(loop % (rows-3))) {
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94 if (isatty(1)) terminal_size(0, &rows);
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95 else rows = 0;
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96
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97 printf("procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----\n");
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98
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99 for (i=0; i<sizeof(lengths); i++) {
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100 printf(" %*s"+!i, lengths[i], headers);
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101 headers += strlen(headers)+1;
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102 }
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103 xputc('\n');
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104 }
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105
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106 // Read data and combine some fields we display as aggregates
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107 get_vmstat_proc(top+idx);
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108 top[idx].running--; // Don't include ourselves
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109 top[idx].user += top[idx].nice;
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110 top[idx].sys += top[idx].irq + top[idx].sirq;
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111 top[idx].swaptotal -= top[idx].swapfree;
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112
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113 // Collect unit adjustments (outside the inner loop to save time)
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114
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115 if (!loop) {
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116 char *s = toybuf;
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117
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118 xreadfile("/proc/uptime", toybuf, sizeof(toybuf)-1);
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119 while (*(s++) > ' ');
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120 sscanf(s, "%"PRIu64, &units);
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121 } else units = loop_delay;
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122
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123 // add up user, sys, idle, and wait time used since last time
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124 // (Already appended nice to user)
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125 total_hz = 0;
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126 for (i=0; i<4; i++) total_hz += ptr[i+!!i] - oldptr[i+!!i];
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127
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128 // Output values in order[]: running, blocked, swaptotal, memfree, buffers,
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129 // cache, swap_in, swap_out, io_in, io_out, sirq, ctxt, user, sys, idle,wait
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130
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131 for (i=0; i<sizeof(lengths); i++) {
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132 char order[] = {9, 10, 15, 11, 12, 13, 18, 19, 16, 17, 6, 8, 0, 2, 3, 4};
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133 uint64_t out = ptr[order[i]];
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134 int len;
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135
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136 // Adjust rate and units
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137 if (i>5) out -= oldptr[order[i]];
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138 if (order[i]<7) out = ((out*100) + (total_hz/2)) / total_hz;
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139 else if (order[i]>15) out = ((out * page_kb)+(units-1))/units;
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140 else if (order[i]<9) out = (out+(units-1)) / units;
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141
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142 // If a field was too big to fit in its slot, try to compensate later
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143 expected += lengths[i] + !!i;
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144 len = expected - offset - !!i;
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145 if (len < 0) len = 0;
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146 offset += printf(" %*"PRIu64+!i, len, out);
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147 }
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148 xputc('\n');
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149
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150 if (loop_delay) sleep(loop_delay);
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151 else break;
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152 }
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153 }