linux/fs/proc/stat.c
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   1#include <linux/cpumask.h>
   2#include <linux/fs.h>
   3#include <linux/init.h>
   4#include <linux/interrupt.h>
   5#include <linux/kernel_stat.h>
   6#include <linux/proc_fs.h>
   7#include <linux/sched.h>
   8#include <linux/seq_file.h>
   9#include <linux/slab.h>
  10#include <linux/time.h>
  11#include <linux/irqnr.h>
  12#include <asm/cputime.h>
  13
  14#ifndef arch_irq_stat_cpu
  15#define arch_irq_stat_cpu(cpu) 0
  16#endif
  17#ifndef arch_irq_stat
  18#define arch_irq_stat() 0
  19#endif
  20#ifndef arch_idle_time
  21#define arch_idle_time(cpu) 0
  22#endif
  23
  24static int show_stat(struct seq_file *p, void *v)
  25{
  26        int i, j;
  27        unsigned long jif;
  28        cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
  29        cputime64_t guest, guest_nice;
  30        u64 sum = 0;
  31        u64 sum_softirq = 0;
  32        unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
  33        struct timespec boottime;
  34
  35        user = nice = system = idle = iowait =
  36                irq = softirq = steal = cputime64_zero;
  37        guest = guest_nice = cputime64_zero;
  38        getboottime(&boottime);
  39        jif = boottime.tv_sec;
  40
  41        for_each_possible_cpu(i) {
  42                user = cputime64_add(user, kstat_cpu(i).cpustat.user);
  43                nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
  44                system = cputime64_add(system, kstat_cpu(i).cpustat.system);
  45                idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
  46                idle = cputime64_add(idle, arch_idle_time(i));
  47                iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
  48                irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
  49                softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
  50                steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
  51                guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
  52                guest_nice = cputime64_add(guest_nice,
  53                        kstat_cpu(i).cpustat.guest_nice);
  54                sum += kstat_cpu_irqs_sum(i);
  55                sum += arch_irq_stat_cpu(i);
  56
  57                for (j = 0; j < NR_SOFTIRQS; j++) {
  58                        unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
  59
  60                        per_softirq_sums[j] += softirq_stat;
  61                        sum_softirq += softirq_stat;
  62                }
  63        }
  64        sum += arch_irq_stat();
  65
  66        seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  67                "%llu\n",
  68                (unsigned long long)cputime64_to_clock_t(user),
  69                (unsigned long long)cputime64_to_clock_t(nice),
  70                (unsigned long long)cputime64_to_clock_t(system),
  71                (unsigned long long)cputime64_to_clock_t(idle),
  72                (unsigned long long)cputime64_to_clock_t(iowait),
  73                (unsigned long long)cputime64_to_clock_t(irq),
  74                (unsigned long long)cputime64_to_clock_t(softirq),
  75                (unsigned long long)cputime64_to_clock_t(steal),
  76                (unsigned long long)cputime64_to_clock_t(guest),
  77                (unsigned long long)cputime64_to_clock_t(guest_nice));
  78        for_each_online_cpu(i) {
  79
  80                /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  81                user = kstat_cpu(i).cpustat.user;
  82                nice = kstat_cpu(i).cpustat.nice;
  83                system = kstat_cpu(i).cpustat.system;
  84                idle = kstat_cpu(i).cpustat.idle;
  85                idle = cputime64_add(idle, arch_idle_time(i));
  86                iowait = kstat_cpu(i).cpustat.iowait;
  87                irq = kstat_cpu(i).cpustat.irq;
  88                softirq = kstat_cpu(i).cpustat.softirq;
  89                steal = kstat_cpu(i).cpustat.steal;
  90                guest = kstat_cpu(i).cpustat.guest;
  91                guest_nice = kstat_cpu(i).cpustat.guest_nice;
  92                seq_printf(p,
  93                        "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  94                        "%llu\n",
  95                        i,
  96                        (unsigned long long)cputime64_to_clock_t(user),
  97                        (unsigned long long)cputime64_to_clock_t(nice),
  98                        (unsigned long long)cputime64_to_clock_t(system),
  99                        (unsigned long long)cputime64_to_clock_t(idle),
 100                        (unsigned long long)cputime64_to_clock_t(iowait),
 101                        (unsigned long long)cputime64_to_clock_t(irq),
 102                        (unsigned long long)cputime64_to_clock_t(softirq),
 103                        (unsigned long long)cputime64_to_clock_t(steal),
 104                        (unsigned long long)cputime64_to_clock_t(guest),
 105                        (unsigned long long)cputime64_to_clock_t(guest_nice));
 106        }
 107        seq_printf(p, "intr %llu", (unsigned long long)sum);
 108
 109        /* sum again ? it could be updated? */
 110        for_each_irq_nr(j)
 111                seq_printf(p, " %u", kstat_irqs(j));
 112
 113        seq_printf(p,
 114                "\nctxt %llu\n"
 115                "btime %lu\n"
 116                "processes %lu\n"
 117                "procs_running %lu\n"
 118                "procs_blocked %lu\n",
 119                nr_context_switches(),
 120                (unsigned long)jif,
 121                total_forks,
 122                nr_running(),
 123                nr_iowait());
 124
 125        seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
 126
 127        for (i = 0; i < NR_SOFTIRQS; i++)
 128                seq_printf(p, " %u", per_softirq_sums[i]);
 129        seq_putc(p, '\n');
 130
 131        return 0;
 132}
 133
 134static int stat_open(struct inode *inode, struct file *file)
 135{
 136        unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 137        char *buf;
 138        struct seq_file *m;
 139        int res;
 140
 141        /* don't ask for more than the kmalloc() max size, currently 128 KB */
 142        if (size > 128 * 1024)
 143                size = 128 * 1024;
 144        buf = kmalloc(size, GFP_KERNEL);
 145        if (!buf)
 146                return -ENOMEM;
 147
 148        res = single_open(file, show_stat, NULL);
 149        if (!res) {
 150                m = file->private_data;
 151                m->buf = buf;
 152                m->size = size;
 153        } else
 154                kfree(buf);
 155        return res;
 156}
 157
 158static const struct file_operations proc_stat_operations = {
 159        .open           = stat_open,
 160        .read           = seq_read,
 161        .llseek         = seq_lseek,
 162        .release        = single_release,
 163};
 164
 165static int __init proc_stat_init(void)
 166{
 167        proc_create("stat", 0, NULL, &proc_stat_operations);
 168        return 0;
 169}
 170module_init(proc_stat_init);
 171