1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Per-processor statistics, 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_MPSTAT(APPLET(mpstat, BB_DIR_BIN, BB_SUID_DROP))
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11 |
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12 | //kbuild:lib-$(CONFIG_MPSTAT) += mpstat.o
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13 |
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14 | //config:config MPSTAT
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15 | //config: bool "mpstat"
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16 | //config: default y
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17 | //config: help
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18 | //config: Per-processor statistics
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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 | /* Size of /proc/interrupts line, CPU data excluded */
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27 | #define INTERRUPTS_LINE 64
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28 | /* Maximum number of interrupts */
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29 | #define NR_IRQS 256
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30 | #define NR_IRQCPU_PREALLOC 3
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31 | #define MAX_IRQNAME_LEN 16
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32 | #define MAX_PF_NAME 512
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33 | /* sysstat 9.0.6 uses width 8, but newer code which also prints /proc/softirqs
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34 | * data needs more: "interrupts" in /proc/softirqs have longer names,
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35 | * most are up to 8 chars, one (BLOCK_IOPOLL) is even longer.
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36 | * We are printing headers in the " IRQNAME/s" form, experimentally
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37 | * anything smaller than 10 chars looks ugly for /proc/softirqs stats.
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38 | */
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39 | #define INTRATE_SCRWIDTH 10
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40 | #define INTRATE_SCRWIDTH_STR "10"
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41 |
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42 | /* System files */
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43 | #define PROCFS_STAT "/proc/stat"
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44 | #define PROCFS_INTERRUPTS "/proc/interrupts"
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45 | #define PROCFS_SOFTIRQS "/proc/softirqs"
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46 | #define PROCFS_UPTIME "/proc/uptime"
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47 |
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48 |
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49 | #if 1
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50 | typedef unsigned long long data_t;
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51 | typedef long long idata_t;
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52 | #define FMT_DATA "ll"
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53 | #define DATA_MAX ULLONG_MAX
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54 | #else
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55 | typedef unsigned long data_t;
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56 | typedef long idata_t;
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57 | #define FMT_DATA "l"
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58 | #define DATA_MAX ULONG_MAX
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59 | #endif
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60 |
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61 |
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62 | struct stats_irqcpu {
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63 | unsigned interrupts;
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64 | char irq_name[MAX_IRQNAME_LEN];
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65 | };
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66 |
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67 | struct stats_cpu {
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68 | data_t cpu_user;
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69 | data_t cpu_nice;
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70 | data_t cpu_system;
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71 | data_t cpu_idle;
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72 | data_t cpu_iowait;
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73 | data_t cpu_steal;
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74 | data_t cpu_irq;
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75 | data_t cpu_softirq;
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76 | data_t cpu_guest;
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77 | };
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78 |
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79 | struct stats_irq {
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80 | data_t irq_nr;
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81 | };
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82 |
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83 |
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84 | /* Globals. Sort by size and access frequency. */
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85 | struct globals {
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86 | int interval;
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87 | int count;
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88 | unsigned cpu_nr; /* Number of CPUs */
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89 | unsigned irqcpu_nr; /* Number of interrupts per CPU */
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90 | unsigned softirqcpu_nr; /* Number of soft interrupts per CPU */
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91 | unsigned options;
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92 | unsigned hz;
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93 | unsigned cpu_bitmap_len;
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94 | smallint p_option;
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95 | // 9.0.6 does not do it. Try "mpstat -A 1 2" - headers are repeated!
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96 | //smallint header_done;
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97 | //smallint avg_header_done;
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98 | unsigned char *cpu_bitmap; /* Bit 0: global, bit 1: 1st proc... */
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99 | data_t global_uptime[3];
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100 | data_t per_cpu_uptime[3];
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101 | struct stats_cpu *st_cpu[3];
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102 | struct stats_irq *st_irq[3];
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103 | struct stats_irqcpu *st_irqcpu[3];
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104 | struct stats_irqcpu *st_softirqcpu[3];
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105 | struct tm timestamp[3];
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106 | };
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107 | #define G (*ptr_to_globals)
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108 | #define INIT_G() do { \
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109 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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110 | } while (0)
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111 |
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112 | /* The selected interrupts statistics (bits in G.options) */
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113 | enum {
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114 | D_CPU = 1 << 0,
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115 | D_IRQ_SUM = 1 << 1,
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116 | D_IRQ_CPU = 1 << 2,
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117 | D_SOFTIRQS = 1 << 3,
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118 | };
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119 |
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120 |
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121 | /* Is option on? */
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122 | static ALWAYS_INLINE int display_opt(int opt)
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123 | {
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124 | return (opt & G.options);
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125 | }
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126 |
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127 | #if DATA_MAX > 0xffffffff
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128 | /*
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129 | * Handle overflow conditions properly for counters which can have
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130 | * less bits than data_t, depending on the kernel version.
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131 | */
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132 | /* Surprisingly, on 32bit inlining is a size win */
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133 | static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
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134 | {
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135 | data_t v = curr - prev;
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136 |
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137 | if ((idata_t)v < 0 /* curr < prev - counter overflow? */
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138 | && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
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139 | ) {
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140 | /* Add 33th bit set to 1 to curr, compensating for the overflow */
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141 | /* double shift defeats "warning: left shift count >= width of type" */
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142 | v += ((data_t)1 << 16) << 16;
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143 | }
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144 | return v;
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145 | }
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146 | #else
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147 | static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
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148 | {
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149 | return curr - prev;
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150 | }
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151 | #endif
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152 |
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153 | static double percent_value(data_t prev, data_t curr, data_t itv)
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154 | {
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155 | return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
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156 | }
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157 |
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158 | static double hz_value(data_t prev, data_t curr, data_t itv)
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159 | {
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160 | //bb_error_msg("curr:%lld prev:%lld G.hz:%u", curr, prev, G.hz);
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161 | return ((double)overflow_safe_sub(prev, curr)) / itv * G.hz;
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162 | }
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163 |
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164 | static ALWAYS_INLINE data_t jiffies_diff(data_t old, data_t new)
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165 | {
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166 | data_t diff = new - old;
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167 | return (diff == 0) ? 1 : diff;
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168 | }
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169 |
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170 | static int is_cpu_in_bitmap(unsigned cpu)
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171 | {
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172 | return G.cpu_bitmap[cpu >> 3] & (1 << (cpu & 7));
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173 | }
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174 |
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175 | static void write_irqcpu_stats(struct stats_irqcpu *per_cpu_stats[],
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176 | int total_irqs,
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177 | data_t itv,
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178 | int prev, int current,
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179 | const char *prev_str, const char *current_str)
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180 | {
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181 | int j;
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182 | int offset, cpu;
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183 | struct stats_irqcpu *p0, *q0;
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184 |
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185 | /* Check if number of IRQs has changed */
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186 | if (G.interval != 0) {
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187 | for (j = 0; j <= total_irqs; j++) {
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188 | p0 = &per_cpu_stats[current][j];
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189 | if (p0->irq_name[0] != '\0') {
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190 | q0 = &per_cpu_stats[prev][j];
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191 | if (strcmp(p0->irq_name, q0->irq_name) != 0) {
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192 | /* Strings are different */
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193 | break;
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194 | }
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195 | }
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196 | }
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197 | }
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198 |
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199 | /* Print header */
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200 | printf("\n%-11s CPU", prev_str);
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201 | {
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202 | /* A bit complex code to "buy back" space if one header is too wide.
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203 | * Here's how it looks like. BLOCK_IOPOLL eats too much space,
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204 | * and latter headers use smaller width to compensate:
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205 | * ...BLOCK/s BLOCK_IOPOLL/s TASKLET/s SCHED/s HRTIMER/s RCU/s
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206 | * ... 2.32 0.00 0.01 17.58 0.14 141.96
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207 | */
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208 | int expected_len = 0;
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209 | int printed_len = 0;
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210 | for (j = 0; j < total_irqs; j++) {
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211 | p0 = &per_cpu_stats[current][j];
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212 | if (p0->irq_name[0] != '\0') {
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213 | int n = (INTRATE_SCRWIDTH-3) - (printed_len - expected_len);
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214 | printed_len += printf(" %*s/s", n > 0 ? n : 0, skip_whitespace(p0->irq_name));
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215 | expected_len += INTRATE_SCRWIDTH;
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216 | }
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217 | }
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218 | }
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219 | bb_putchar('\n');
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220 |
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221 | for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
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222 | /* Check if we want stats about this CPU */
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223 | if (!is_cpu_in_bitmap(cpu) && G.p_option) {
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224 | continue;
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225 | }
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226 |
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227 | printf("%-11s %4u", current_str, cpu - 1);
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228 |
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229 | for (j = 0; j < total_irqs; j++) {
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230 | /* IRQ field set only for proc 0 */
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231 | p0 = &per_cpu_stats[current][j];
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232 |
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233 | /*
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234 | * An empty string for irq name means that
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235 | * interrupt is no longer used.
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236 | */
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237 | if (p0->irq_name[0] != '\0') {
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238 | offset = j;
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239 | q0 = &per_cpu_stats[prev][offset];
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240 |
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241 | /*
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242 | * If we want stats for the time since boot
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243 | * we have p0->irq != q0->irq.
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244 | */
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245 | if (strcmp(p0->irq_name, q0->irq_name) != 0
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246 | && G.interval != 0
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247 | ) {
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248 | if (j) {
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249 | offset = j - 1;
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250 | q0 = &per_cpu_stats[prev][offset];
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251 | }
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252 | if (strcmp(p0->irq_name, q0->irq_name) != 0
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253 | && (j + 1 < total_irqs)
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254 | ) {
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255 | offset = j + 1;
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256 | q0 = &per_cpu_stats[prev][offset];
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257 | }
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258 | }
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259 |
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260 | if (strcmp(p0->irq_name, q0->irq_name) == 0
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261 | || G.interval == 0
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262 | ) {
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263 | struct stats_irqcpu *p, *q;
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264 | p = &per_cpu_stats[current][(cpu - 1) * total_irqs + j];
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265 | q = &per_cpu_stats[prev][(cpu - 1) * total_irqs + offset];
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266 | printf("%"INTRATE_SCRWIDTH_STR".2f",
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267 | (double)(p->interrupts - q->interrupts) / itv * G.hz);
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268 | } else {
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269 | printf(" N/A");
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270 | }
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271 | }
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272 | }
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273 | bb_putchar('\n');
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274 | }
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275 | }
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276 |
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277 | static data_t get_per_cpu_interval(const struct stats_cpu *scc,
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278 | const struct stats_cpu *scp)
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279 | {
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280 | return ((scc->cpu_user + scc->cpu_nice +
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281 | scc->cpu_system + scc->cpu_iowait +
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282 | scc->cpu_idle + scc->cpu_steal +
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283 | scc->cpu_irq + scc->cpu_softirq) -
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284 | (scp->cpu_user + scp->cpu_nice +
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285 | scp->cpu_system + scp->cpu_iowait +
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286 | scp->cpu_idle + scp->cpu_steal +
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287 | scp->cpu_irq + scp->cpu_softirq));
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288 | }
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289 |
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290 | static void print_stats_cpu_struct(const struct stats_cpu *p,
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291 | const struct stats_cpu *c,
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292 | data_t itv)
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293 | {
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294 | printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
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295 | percent_value(p->cpu_user - p->cpu_guest,
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296 | /**/ c->cpu_user - c->cpu_guest, itv),
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297 | percent_value(p->cpu_nice , c->cpu_nice , itv),
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298 | percent_value(p->cpu_system , c->cpu_system , itv),
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299 | percent_value(p->cpu_iowait , c->cpu_iowait , itv),
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300 | percent_value(p->cpu_irq , c->cpu_irq , itv),
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301 | percent_value(p->cpu_softirq, c->cpu_softirq, itv),
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302 | percent_value(p->cpu_steal , c->cpu_steal , itv),
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303 | percent_value(p->cpu_guest , c->cpu_guest , itv),
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304 | percent_value(p->cpu_idle , c->cpu_idle , itv)
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305 | );
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306 | }
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307 |
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308 | static void write_stats_core(int prev, int current,
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309 | const char *prev_str, const char *current_str)
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310 | {
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311 | struct stats_cpu *scc, *scp;
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312 | data_t itv, global_itv;
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313 | int cpu;
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314 |
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315 | /* Compute time interval */
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316 | itv = global_itv = jiffies_diff(G.global_uptime[prev], G.global_uptime[current]);
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317 |
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318 | /* Reduce interval to one CPU */
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319 | if (G.cpu_nr > 1)
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320 | itv = jiffies_diff(G.per_cpu_uptime[prev], G.per_cpu_uptime[current]);
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321 |
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322 | /* Print CPU stats */
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323 | if (display_opt(D_CPU)) {
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324 |
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325 | ///* This is done exactly once */
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326 | //if (!G.header_done) {
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327 | printf("\n%-11s CPU %%usr %%nice %%sys %%iowait %%irq %%soft %%steal %%guest %%idle\n",
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328 | prev_str
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329 | );
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330 | // G.header_done = 1;
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331 | //}
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332 |
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333 | for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
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334 | data_t per_cpu_itv;
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335 |
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336 | /* Print stats about this particular CPU? */
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337 | if (!is_cpu_in_bitmap(cpu))
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338 | continue;
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339 |
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340 | scc = &G.st_cpu[current][cpu];
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341 | scp = &G.st_cpu[prev][cpu];
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342 | per_cpu_itv = global_itv;
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343 |
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344 | printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
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345 | if (cpu) {
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346 | double idle;
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347 | /*
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348 | * If the CPU is offline, then it isn't in /proc/stat,
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349 | * so all values are 0.
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350 | * NB: Guest time is already included in user time.
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351 | */
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352 | if ((scc->cpu_user | scc->cpu_nice | scc->cpu_system |
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353 | scc->cpu_iowait | scc->cpu_idle | scc->cpu_steal |
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354 | scc->cpu_irq | scc->cpu_softirq) == 0
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355 | ) {
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356 | /*
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357 | * Set current struct fields to values from prev.
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358 | * iteration. Then their values won't jump from
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359 | * zero, when the CPU comes back online.
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360 | */
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361 | *scc = *scp;
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362 | idle = 0.0;
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363 | goto print_zeros;
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364 | }
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365 | /* Compute interval again for current proc */
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366 | per_cpu_itv = get_per_cpu_interval(scc, scp);
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367 | if (per_cpu_itv == 0) {
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368 | /*
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369 | * If the CPU is tickless then there is no change in CPU values
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370 | * but the sum of values is not zero.
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371 | */
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372 | idle = 100.0;
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373 | print_zeros:
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374 | printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
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375 | 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, idle);
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376 | continue;
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377 | }
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378 | }
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379 | print_stats_cpu_struct(scp, scc, per_cpu_itv);
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380 | }
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381 | }
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382 |
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383 | /* Print total number of IRQs per CPU */
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384 | if (display_opt(D_IRQ_SUM)) {
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385 |
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386 | ///* Print average header, this is done exactly once */
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387 | //if (!G.avg_header_done) {
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388 | printf("\n%-11s CPU intr/s\n", prev_str);
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389 | // G.avg_header_done = 1;
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390 | //}
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391 |
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392 | for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
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393 | data_t per_cpu_itv;
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394 |
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395 | /* Print stats about this CPU? */
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396 | if (!is_cpu_in_bitmap(cpu))
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397 | continue;
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398 |
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399 | per_cpu_itv = itv;
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400 | printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
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401 | if (cpu) {
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402 | scc = &G.st_cpu[current][cpu];
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403 | scp = &G.st_cpu[prev][cpu];
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404 | /* Compute interval again for current proc */
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405 | per_cpu_itv = get_per_cpu_interval(scc, scp);
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406 | if (per_cpu_itv == 0) {
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407 | printf(" %9.2f\n", 0.0);
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408 | continue;
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409 | }
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410 | }
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411 | //bb_error_msg("G.st_irq[%u][%u].irq_nr:%lld - G.st_irq[%u][%u].irq_nr:%lld",
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412 | // current, cpu, G.st_irq[prev][cpu].irq_nr, prev, cpu, G.st_irq[current][cpu].irq_nr);
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413 | printf(" %9.2f\n", hz_value(G.st_irq[prev][cpu].irq_nr, G.st_irq[current][cpu].irq_nr, per_cpu_itv));
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414 | }
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415 | }
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416 |
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417 | if (display_opt(D_IRQ_CPU)) {
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418 | write_irqcpu_stats(G.st_irqcpu, G.irqcpu_nr,
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419 | itv,
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420 | prev, current,
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421 | prev_str, current_str
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422 | );
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423 | }
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424 |
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425 | if (display_opt(D_SOFTIRQS)) {
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426 | write_irqcpu_stats(G.st_softirqcpu, G.softirqcpu_nr,
|
---|
427 | itv,
|
---|
428 | prev, current,
|
---|
429 | prev_str, current_str
|
---|
430 | );
|
---|
431 | }
|
---|
432 | }
|
---|
433 |
|
---|
434 | /*
|
---|
435 | * Print the statistics
|
---|
436 | */
|
---|
437 | static void write_stats(int current)
|
---|
438 | {
|
---|
439 | char prev_time[16];
|
---|
440 | char curr_time[16];
|
---|
441 |
|
---|
442 | strftime(prev_time, sizeof(prev_time), "%X", &G.timestamp[!current]);
|
---|
443 | strftime(curr_time, sizeof(curr_time), "%X", &G.timestamp[current]);
|
---|
444 |
|
---|
445 | write_stats_core(!current, current, prev_time, curr_time);
|
---|
446 | }
|
---|
447 |
|
---|
448 | static void write_stats_avg(int current)
|
---|
449 | {
|
---|
450 | write_stats_core(2, current, "Average:", "Average:");
|
---|
451 | }
|
---|
452 |
|
---|
453 | /*
|
---|
454 | * Read CPU statistics
|
---|
455 | */
|
---|
456 | static void get_cpu_statistics(struct stats_cpu *cpu, data_t *up, data_t *up0)
|
---|
457 | {
|
---|
458 | FILE *fp;
|
---|
459 | char buf[1024];
|
---|
460 |
|
---|
461 | fp = xfopen_for_read(PROCFS_STAT);
|
---|
462 |
|
---|
463 | while (fgets(buf, sizeof(buf), fp)) {
|
---|
464 | data_t sum;
|
---|
465 | unsigned cpu_number;
|
---|
466 | struct stats_cpu *cp;
|
---|
467 |
|
---|
468 | if (!starts_with_cpu(buf))
|
---|
469 | continue; /* not "cpu" */
|
---|
470 |
|
---|
471 | cp = cpu; /* for "cpu " case */
|
---|
472 | if (buf[3] != ' ') {
|
---|
473 | /* "cpuN " */
|
---|
474 | if (G.cpu_nr == 0
|
---|
475 | || sscanf(buf + 3, "%u ", &cpu_number) != 1
|
---|
476 | || cpu_number >= G.cpu_nr
|
---|
477 | ) {
|
---|
478 | continue;
|
---|
479 | }
|
---|
480 | cp = &cpu[cpu_number + 1];
|
---|
481 | }
|
---|
482 |
|
---|
483 | /* Read the counters, save them */
|
---|
484 | /* Not all fields have to be present */
|
---|
485 | memset(cp, 0, sizeof(*cp));
|
---|
486 | sscanf(buf, "%*s"
|
---|
487 | " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
|
---|
488 | " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
|
---|
489 | " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
|
---|
490 | &cp->cpu_user, &cp->cpu_nice, &cp->cpu_system,
|
---|
491 | &cp->cpu_idle, &cp->cpu_iowait, &cp->cpu_irq,
|
---|
492 | &cp->cpu_softirq, &cp->cpu_steal, &cp->cpu_guest
|
---|
493 | );
|
---|
494 | /*
|
---|
495 | * Compute uptime in jiffies (1/HZ), it'll be the sum of
|
---|
496 | * individual CPU's uptimes.
|
---|
497 | * NB: We have to omit cpu_guest, because cpu_user includes it.
|
---|
498 | */
|
---|
499 | sum = cp->cpu_user + cp->cpu_nice + cp->cpu_system +
|
---|
500 | cp->cpu_idle + cp->cpu_iowait + cp->cpu_irq +
|
---|
501 | cp->cpu_softirq + cp->cpu_steal;
|
---|
502 |
|
---|
503 | if (buf[3] == ' ') {
|
---|
504 | /* "cpu " */
|
---|
505 | *up = sum;
|
---|
506 | } else {
|
---|
507 | /* "cpuN " */
|
---|
508 | if (cpu_number == 0 && *up0 != 0) {
|
---|
509 | /* Compute uptime of single CPU */
|
---|
510 | *up0 = sum;
|
---|
511 | }
|
---|
512 | }
|
---|
513 | }
|
---|
514 | fclose(fp);
|
---|
515 | }
|
---|
516 |
|
---|
517 | /*
|
---|
518 | * Read IRQs from /proc/stat
|
---|
519 | */
|
---|
520 | static void get_irqs_from_stat(struct stats_irq *irq)
|
---|
521 | {
|
---|
522 | FILE *fp;
|
---|
523 | char buf[1024];
|
---|
524 |
|
---|
525 | fp = xfopen_for_read(PROCFS_STAT);
|
---|
526 |
|
---|
527 | while (fgets(buf, sizeof(buf), fp)) {
|
---|
528 | //bb_error_msg("/proc/stat:'%s'", buf);
|
---|
529 | if (is_prefixed_with(buf, "intr ")) {
|
---|
530 | /* Read total number of IRQs since system boot */
|
---|
531 | sscanf(buf + 5, "%"FMT_DATA"u", &irq->irq_nr);
|
---|
532 | }
|
---|
533 | }
|
---|
534 |
|
---|
535 | fclose(fp);
|
---|
536 | }
|
---|
537 |
|
---|
538 | /*
|
---|
539 | * Read stats from /proc/interrupts or /proc/softirqs
|
---|
540 | */
|
---|
541 | static void get_irqs_from_interrupts(const char *fname,
|
---|
542 | struct stats_irqcpu *per_cpu_stats[],
|
---|
543 | int irqs_per_cpu, int current)
|
---|
544 | {
|
---|
545 | FILE *fp;
|
---|
546 | struct stats_irq *irq_i;
|
---|
547 | struct stats_irqcpu *ic;
|
---|
548 | char *buf;
|
---|
549 | unsigned buflen;
|
---|
550 | unsigned cpu;
|
---|
551 | unsigned irq;
|
---|
552 | int cpu_index[G.cpu_nr];
|
---|
553 | int iindex;
|
---|
554 |
|
---|
555 | // Moved to caller.
|
---|
556 | // Otherwise reading of /proc/softirqs
|
---|
557 | // was resetting counts to 0 after we painstakingly collected them from
|
---|
558 | // /proc/interrupts. Which resulted in:
|
---|
559 | // 01:32:47 PM CPU intr/s
|
---|
560 | // 01:32:47 PM all 591.47
|
---|
561 | // 01:32:47 PM 0 0.00 <= ???
|
---|
562 | // 01:32:47 PM 1 0.00 <= ???
|
---|
563 | // for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
|
---|
564 | // G.st_irq[current][cpu].irq_nr = 0;
|
---|
565 | // //bb_error_msg("G.st_irq[%u][%u].irq_nr=0", current, cpu);
|
---|
566 | // }
|
---|
567 |
|
---|
568 | fp = fopen_for_read(fname);
|
---|
569 | if (!fp)
|
---|
570 | return;
|
---|
571 |
|
---|
572 | buflen = INTERRUPTS_LINE + 16 * G.cpu_nr;
|
---|
573 | buf = xmalloc(buflen);
|
---|
574 |
|
---|
575 | /* Parse header and determine, which CPUs are online */
|
---|
576 | iindex = 0;
|
---|
577 | while (fgets(buf, buflen, fp)) {
|
---|
578 | char *cp, *next;
|
---|
579 | next = buf;
|
---|
580 | while ((cp = strstr(next, "CPU")) != NULL
|
---|
581 | && iindex < G.cpu_nr
|
---|
582 | ) {
|
---|
583 | cpu = strtoul(cp + 3, &next, 10);
|
---|
584 | cpu_index[iindex++] = cpu;
|
---|
585 | }
|
---|
586 | if (iindex) /* We found header */
|
---|
587 | break;
|
---|
588 | }
|
---|
589 |
|
---|
590 | irq = 0;
|
---|
591 | while (fgets(buf, buflen, fp)
|
---|
592 | && irq < irqs_per_cpu
|
---|
593 | ) {
|
---|
594 | int len;
|
---|
595 | char last_char;
|
---|
596 | char *cp;
|
---|
597 |
|
---|
598 | /* Skip over "IRQNAME:" */
|
---|
599 | cp = strchr(buf, ':');
|
---|
600 | if (!cp)
|
---|
601 | continue;
|
---|
602 | last_char = cp[-1];
|
---|
603 |
|
---|
604 | ic = &per_cpu_stats[current][irq];
|
---|
605 | len = cp - buf;
|
---|
606 | if (len >= sizeof(ic->irq_name)) {
|
---|
607 | len = sizeof(ic->irq_name) - 1;
|
---|
608 | }
|
---|
609 | safe_strncpy(ic->irq_name, buf, len + 1);
|
---|
610 | //bb_error_msg("%s: irq%d:'%s' buf:'%s'", fname, irq, ic->irq_name, buf);
|
---|
611 | cp++;
|
---|
612 |
|
---|
613 | for (cpu = 0; cpu < iindex; cpu++) {
|
---|
614 | char *next;
|
---|
615 | ic = &per_cpu_stats[current][cpu_index[cpu] * irqs_per_cpu + irq];
|
---|
616 | irq_i = &G.st_irq[current][cpu_index[cpu] + 1];
|
---|
617 | ic->interrupts = strtoul(cp, &next, 10);
|
---|
618 | /* Count only numerical IRQs */
|
---|
619 | if (isdigit(last_char)) {
|
---|
620 | irq_i->irq_nr += ic->interrupts;
|
---|
621 | //bb_error_msg("G.st_irq[%u][%u].irq_nr + %u = %lld",
|
---|
622 | // current, cpu_index[cpu] + 1, ic->interrupts, irq_i->irq_nr);
|
---|
623 | }
|
---|
624 | cp = next;
|
---|
625 | }
|
---|
626 | irq++;
|
---|
627 | }
|
---|
628 | fclose(fp);
|
---|
629 | free(buf);
|
---|
630 |
|
---|
631 | while (irq < irqs_per_cpu) {
|
---|
632 | /* Number of interrupts per CPU has changed */
|
---|
633 | ic = &per_cpu_stats[current][irq];
|
---|
634 | ic->irq_name[0] = '\0'; /* False interrupt */
|
---|
635 | irq++;
|
---|
636 | }
|
---|
637 | }
|
---|
638 |
|
---|
639 | static void get_uptime(data_t *uptime)
|
---|
640 | {
|
---|
641 | FILE *fp;
|
---|
642 | char buf[sizeof(long)*3 * 2 + 4]; /* enough for long.long */
|
---|
643 | unsigned long uptime_sec, decimal;
|
---|
644 |
|
---|
645 | fp = xfopen_for_read(PROCFS_UPTIME);
|
---|
646 | if (fgets(buf, sizeof(buf), fp)) {
|
---|
647 | if (sscanf(buf, "%lu.%lu", &uptime_sec, &decimal) == 2) {
|
---|
648 | *uptime = (data_t)uptime_sec * G.hz + decimal * G.hz / 100;
|
---|
649 | }
|
---|
650 | }
|
---|
651 |
|
---|
652 | fclose(fp);
|
---|
653 | }
|
---|
654 |
|
---|
655 | static void get_localtime(struct tm *tm)
|
---|
656 | {
|
---|
657 | time_t timer;
|
---|
658 | time(&timer);
|
---|
659 | localtime_r(&timer, tm);
|
---|
660 | }
|
---|
661 |
|
---|
662 | static void alarm_handler(int sig UNUSED_PARAM)
|
---|
663 | {
|
---|
664 | signal(SIGALRM, alarm_handler);
|
---|
665 | alarm(G.interval);
|
---|
666 | }
|
---|
667 |
|
---|
668 | static void main_loop(void)
|
---|
669 | {
|
---|
670 | unsigned current;
|
---|
671 | unsigned cpus;
|
---|
672 |
|
---|
673 | /* Read the stats */
|
---|
674 | if (G.cpu_nr > 1) {
|
---|
675 | G.per_cpu_uptime[0] = 0;
|
---|
676 | get_uptime(&G.per_cpu_uptime[0]);
|
---|
677 | }
|
---|
678 |
|
---|
679 | get_cpu_statistics(G.st_cpu[0], &G.global_uptime[0], &G.per_cpu_uptime[0]);
|
---|
680 |
|
---|
681 | if (display_opt(D_IRQ_SUM))
|
---|
682 | get_irqs_from_stat(G.st_irq[0]);
|
---|
683 |
|
---|
684 | if (display_opt(D_IRQ_SUM | D_IRQ_CPU))
|
---|
685 | get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
|
---|
686 | G.irqcpu_nr, 0);
|
---|
687 |
|
---|
688 | if (display_opt(D_SOFTIRQS))
|
---|
689 | get_irqs_from_interrupts(PROCFS_SOFTIRQS, G.st_softirqcpu,
|
---|
690 | G.softirqcpu_nr, 0);
|
---|
691 |
|
---|
692 | if (G.interval == 0) {
|
---|
693 | /* Display since boot time */
|
---|
694 | cpus = G.cpu_nr + 1;
|
---|
695 | G.timestamp[1] = G.timestamp[0];
|
---|
696 | memset(G.st_cpu[1], 0, sizeof(G.st_cpu[1][0]) * cpus);
|
---|
697 | memset(G.st_irq[1], 0, sizeof(G.st_irq[1][0]) * cpus);
|
---|
698 | memset(G.st_irqcpu[1], 0, sizeof(G.st_irqcpu[1][0]) * cpus * G.irqcpu_nr);
|
---|
699 | memset(G.st_softirqcpu[1], 0, sizeof(G.st_softirqcpu[1][0]) * cpus * G.softirqcpu_nr);
|
---|
700 |
|
---|
701 | write_stats(0);
|
---|
702 |
|
---|
703 | /* And we're done */
|
---|
704 | return;
|
---|
705 | }
|
---|
706 |
|
---|
707 | /* Set a handler for SIGALRM */
|
---|
708 | alarm_handler(0);
|
---|
709 |
|
---|
710 | /* Save the stats we already have. We need them to compute the average */
|
---|
711 | G.timestamp[2] = G.timestamp[0];
|
---|
712 | G.global_uptime[2] = G.global_uptime[0];
|
---|
713 | G.per_cpu_uptime[2] = G.per_cpu_uptime[0];
|
---|
714 | cpus = G.cpu_nr + 1;
|
---|
715 | memcpy(G.st_cpu[2], G.st_cpu[0], sizeof(G.st_cpu[0][0]) * cpus);
|
---|
716 | memcpy(G.st_irq[2], G.st_irq[0], sizeof(G.st_irq[0][0]) * cpus);
|
---|
717 | memcpy(G.st_irqcpu[2], G.st_irqcpu[0], sizeof(G.st_irqcpu[0][0]) * cpus * G.irqcpu_nr);
|
---|
718 | if (display_opt(D_SOFTIRQS)) {
|
---|
719 | memcpy(G.st_softirqcpu[2], G.st_softirqcpu[0],
|
---|
720 | sizeof(G.st_softirqcpu[0][0]) * cpus * G.softirqcpu_nr);
|
---|
721 | }
|
---|
722 |
|
---|
723 | current = 1;
|
---|
724 | while (1) {
|
---|
725 | /* Suspend until a signal is received */
|
---|
726 | pause();
|
---|
727 |
|
---|
728 | /* Set structures to 0 to distinguish off/online CPUs */
|
---|
729 | memset(&G.st_cpu[current][/*cpu:*/ 1], 0, sizeof(G.st_cpu[0][0]) * G.cpu_nr);
|
---|
730 |
|
---|
731 | get_localtime(&G.timestamp[current]);
|
---|
732 |
|
---|
733 | /* Read stats */
|
---|
734 | if (G.cpu_nr > 1) {
|
---|
735 | G.per_cpu_uptime[current] = 0;
|
---|
736 | get_uptime(&G.per_cpu_uptime[current]);
|
---|
737 | }
|
---|
738 | get_cpu_statistics(G.st_cpu[current], &G.global_uptime[current], &G.per_cpu_uptime[current]);
|
---|
739 |
|
---|
740 | if (display_opt(D_IRQ_SUM))
|
---|
741 | get_irqs_from_stat(G.st_irq[current]);
|
---|
742 |
|
---|
743 | if (display_opt(D_IRQ_SUM | D_IRQ_CPU)) {
|
---|
744 | int cpu;
|
---|
745 | for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
|
---|
746 | G.st_irq[current][cpu].irq_nr = 0;
|
---|
747 | }
|
---|
748 | /* accumulates .irq_nr */
|
---|
749 | get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
|
---|
750 | G.irqcpu_nr, current);
|
---|
751 | }
|
---|
752 |
|
---|
753 | if (display_opt(D_SOFTIRQS))
|
---|
754 | get_irqs_from_interrupts(PROCFS_SOFTIRQS,
|
---|
755 | G.st_softirqcpu,
|
---|
756 | G.softirqcpu_nr, current);
|
---|
757 |
|
---|
758 | write_stats(current);
|
---|
759 |
|
---|
760 | if (G.count > 0) {
|
---|
761 | if (--G.count == 0)
|
---|
762 | break;
|
---|
763 | }
|
---|
764 |
|
---|
765 | current ^= 1;
|
---|
766 | }
|
---|
767 |
|
---|
768 | /* Print average statistics */
|
---|
769 | write_stats_avg(current);
|
---|
770 | }
|
---|
771 |
|
---|
772 | /* Initialization */
|
---|
773 |
|
---|
774 | static void alloc_struct(int cpus)
|
---|
775 | {
|
---|
776 | int i;
|
---|
777 | for (i = 0; i < 3; i++) {
|
---|
778 | G.st_cpu[i] = xzalloc(sizeof(G.st_cpu[i][0]) * cpus);
|
---|
779 | G.st_irq[i] = xzalloc(sizeof(G.st_irq[i][0]) * cpus);
|
---|
780 | G.st_irqcpu[i] = xzalloc(sizeof(G.st_irqcpu[i][0]) * cpus * G.irqcpu_nr);
|
---|
781 | G.st_softirqcpu[i] = xzalloc(sizeof(G.st_softirqcpu[i][0]) * cpus * G.softirqcpu_nr);
|
---|
782 | }
|
---|
783 | G.cpu_bitmap_len = (cpus >> 3) + 1;
|
---|
784 | G.cpu_bitmap = xzalloc(G.cpu_bitmap_len);
|
---|
785 | }
|
---|
786 |
|
---|
787 | static void print_header(struct tm *t)
|
---|
788 | {
|
---|
789 | char cur_date[16];
|
---|
790 | struct utsname uts;
|
---|
791 |
|
---|
792 | /* Get system name, release number and hostname */
|
---|
793 | uname(&uts);
|
---|
794 |
|
---|
795 | strftime(cur_date, sizeof(cur_date), "%x", t);
|
---|
796 |
|
---|
797 | printf("%s %s (%s)\t%s\t_%s_\t(%u CPU)\n",
|
---|
798 | uts.sysname, uts.release, uts.nodename, cur_date, uts.machine, G.cpu_nr);
|
---|
799 | }
|
---|
800 |
|
---|
801 | /*
|
---|
802 | * Get number of interrupts available per processor
|
---|
803 | */
|
---|
804 | static int get_irqcpu_nr(const char *f, int max_irqs)
|
---|
805 | {
|
---|
806 | FILE *fp;
|
---|
807 | char *line;
|
---|
808 | unsigned linelen;
|
---|
809 | unsigned irq;
|
---|
810 |
|
---|
811 | fp = fopen_for_read(f);
|
---|
812 | if (!fp) /* No interrupts file */
|
---|
813 | return 0;
|
---|
814 |
|
---|
815 | linelen = INTERRUPTS_LINE + 16 * G.cpu_nr;
|
---|
816 | line = xmalloc(linelen);
|
---|
817 |
|
---|
818 | irq = 0;
|
---|
819 | while (fgets(line, linelen, fp)
|
---|
820 | && irq < max_irqs
|
---|
821 | ) {
|
---|
822 | int p = strcspn(line, ":");
|
---|
823 | if ((p > 0) && (p < 16))
|
---|
824 | irq++;
|
---|
825 | }
|
---|
826 |
|
---|
827 | fclose(fp);
|
---|
828 | free(line);
|
---|
829 |
|
---|
830 | return irq;
|
---|
831 | }
|
---|
832 |
|
---|
833 | //usage:#define mpstat_trivial_usage
|
---|
834 | //usage: "[-A] [-I SUM|CPU|ALL|SCPU] [-u] [-P num|ALL] [INTERVAL [COUNT]]"
|
---|
835 | //usage:#define mpstat_full_usage "\n\n"
|
---|
836 | //usage: "Per-processor statistics\n"
|
---|
837 | //usage: "\n -A Same as -I ALL -u -P ALL"
|
---|
838 | //usage: "\n -I SUM|CPU|ALL|SCPU Report interrupt statistics"
|
---|
839 | //usage: "\n -P num|ALL Processor to monitor"
|
---|
840 | //usage: "\n -u Report CPU utilization"
|
---|
841 |
|
---|
842 | int mpstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
843 | int mpstat_main(int UNUSED_PARAM argc, char **argv)
|
---|
844 | {
|
---|
845 | char *opt_irq_fmt;
|
---|
846 | char *opt_set_cpu;
|
---|
847 | int i, opt;
|
---|
848 | enum {
|
---|
849 | OPT_ALL = 1 << 0, /* -A */
|
---|
850 | OPT_INTS = 1 << 1, /* -I */
|
---|
851 | OPT_SETCPU = 1 << 2, /* -P */
|
---|
852 | OPT_UTIL = 1 << 3, /* -u */
|
---|
853 | };
|
---|
854 |
|
---|
855 | /* Dont buffer data if redirected to a pipe */
|
---|
856 | setbuf(stdout, NULL);
|
---|
857 |
|
---|
858 | INIT_G();
|
---|
859 |
|
---|
860 | G.interval = -1;
|
---|
861 |
|
---|
862 | /* Get number of processors */
|
---|
863 | G.cpu_nr = get_cpu_count();
|
---|
864 |
|
---|
865 | /* Get number of clock ticks per sec */
|
---|
866 | G.hz = bb_clk_tck();
|
---|
867 |
|
---|
868 | /* Calculate number of interrupts per processor */
|
---|
869 | G.irqcpu_nr = get_irqcpu_nr(PROCFS_INTERRUPTS, NR_IRQS) + NR_IRQCPU_PREALLOC;
|
---|
870 |
|
---|
871 | /* Calculate number of soft interrupts per processor */
|
---|
872 | G.softirqcpu_nr = get_irqcpu_nr(PROCFS_SOFTIRQS, NR_IRQS) + NR_IRQCPU_PREALLOC;
|
---|
873 |
|
---|
874 | /* Allocate space for structures. + 1 for global structure. */
|
---|
875 | alloc_struct(G.cpu_nr + 1);
|
---|
876 |
|
---|
877 | /* Parse and process arguments */
|
---|
878 | opt = getopt32(argv, "AI:P:u", &opt_irq_fmt, &opt_set_cpu);
|
---|
879 | argv += optind;
|
---|
880 |
|
---|
881 | if (*argv) {
|
---|
882 | /* Get interval */
|
---|
883 | G.interval = xatoi_positive(*argv);
|
---|
884 | G.count = -1;
|
---|
885 | argv++;
|
---|
886 | if (*argv) {
|
---|
887 | /* Get count value */
|
---|
888 | if (G.interval == 0)
|
---|
889 | bb_show_usage();
|
---|
890 | G.count = xatoi_positive(*argv);
|
---|
891 | //if (*++argv)
|
---|
892 | // bb_show_usage();
|
---|
893 | }
|
---|
894 | }
|
---|
895 | if (G.interval < 0)
|
---|
896 | G.interval = 0;
|
---|
897 |
|
---|
898 | if (opt & OPT_ALL) {
|
---|
899 | G.p_option = 1;
|
---|
900 | G.options |= D_CPU + D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS;
|
---|
901 | /* Select every CPU */
|
---|
902 | memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
|
---|
903 | }
|
---|
904 |
|
---|
905 | if (opt & OPT_INTS) {
|
---|
906 | static const char v[] = {
|
---|
907 | D_IRQ_CPU, D_IRQ_SUM, D_SOFTIRQS,
|
---|
908 | D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS
|
---|
909 | };
|
---|
910 | i = index_in_strings("CPU\0SUM\0SCPU\0ALL\0", opt_irq_fmt);
|
---|
911 | if (i == -1)
|
---|
912 | bb_show_usage();
|
---|
913 | G.options |= v[i];
|
---|
914 | }
|
---|
915 |
|
---|
916 | if ((opt & OPT_UTIL) /* -u? */
|
---|
917 | || G.options == 0 /* nothing? (use default then) */
|
---|
918 | ) {
|
---|
919 | G.options |= D_CPU;
|
---|
920 | }
|
---|
921 |
|
---|
922 | if (opt & OPT_SETCPU) {
|
---|
923 | char *t;
|
---|
924 | G.p_option = 1;
|
---|
925 |
|
---|
926 | for (t = strtok(opt_set_cpu, ","); t; t = strtok(NULL, ",")) {
|
---|
927 | if (strcmp(t, "ALL") == 0) {
|
---|
928 | /* Select every CPU */
|
---|
929 | memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
|
---|
930 | } else {
|
---|
931 | /* Get CPU number */
|
---|
932 | unsigned n = xatoi_positive(t);
|
---|
933 | if (n >= G.cpu_nr)
|
---|
934 | bb_error_msg_and_die("not that many processors");
|
---|
935 | n++;
|
---|
936 | G.cpu_bitmap[n >> 3] |= 1 << (n & 7);
|
---|
937 | }
|
---|
938 | }
|
---|
939 | }
|
---|
940 |
|
---|
941 | if (!G.p_option)
|
---|
942 | /* Display global stats */
|
---|
943 | G.cpu_bitmap[0] = 1;
|
---|
944 |
|
---|
945 | /* Get time */
|
---|
946 | get_localtime(&G.timestamp[0]);
|
---|
947 |
|
---|
948 | /* Display header */
|
---|
949 | print_header(&G.timestamp[0]);
|
---|
950 |
|
---|
951 | /* The main loop */
|
---|
952 | main_loop();
|
---|
953 |
|
---|
954 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
955 | /* Clean up */
|
---|
956 | for (i = 0; i < 3; i++) {
|
---|
957 | free(G.st_cpu[i]);
|
---|
958 | free(G.st_irq[i]);
|
---|
959 | free(G.st_irqcpu[i]);
|
---|
960 | free(G.st_softirqcpu[i]);
|
---|
961 | }
|
---|
962 | free(G.cpu_bitmap);
|
---|
963 | free(&G);
|
---|
964 | }
|
---|
965 |
|
---|
966 | return EXIT_SUCCESS;
|
---|
967 | }
|
---|