fs/proc/stat.c

   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
  24 static 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
 134 static 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
 158 static 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
 165 static int __init proc_stat_init(void)
 166 {
 167         proc_create("stat", 0, NULL, &proc_stat_operations);
 168         return 0;
 169 }
 170 module_init(proc_stat_init);