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         unsigned int per_irq_sum;
  35
  36         user = nice = system = idle = iowait =
  37                 irq = softirq = steal = cputime64_zero;
  38         guest = guest_nice = cputime64_zero;
  39         getboottime(&boottime);
  40         jif = boottime.tv_sec;
  41
  42         for_each_possible_cpu(i) {
  43                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
  44                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
  45                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
  46                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
  47                 idle = cputime64_add(idle, arch_idle_time(i));
  48                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
  49                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
  50                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
  51                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
  52                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
  53                 guest_nice = cputime64_add(guest_nice,
  54                         kstat_cpu(i).cpustat.guest_nice);
  55                 for_each_irq_nr(j) {
  56                         sum += kstat_irqs_cpu(j, i);
  57                 }
  58                 sum += arch_irq_stat_cpu(i);
  59
  60                 for (j = 0; j < NR_SOFTIRQS; j++) {
  61                         unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
  62
  63                         per_softirq_sums[j] += softirq_stat;
  64                         sum_softirq += softirq_stat;
  65                 }
  66         }
  67         sum += arch_irq_stat();
  68
  69         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  70                 "%llu\n",
  71                 (unsigned long long)cputime64_to_clock_t(user),
  72                 (unsigned long long)cputime64_to_clock_t(nice),
  73                 (unsigned long long)cputime64_to_clock_t(system),
  74                 (unsigned long long)cputime64_to_clock_t(idle),
  75                 (unsigned long long)cputime64_to_clock_t(iowait),
  76                 (unsigned long long)cputime64_to_clock_t(irq),
  77                 (unsigned long long)cputime64_to_clock_t(softirq),
  78                 (unsigned long long)cputime64_to_clock_t(steal),
  79                 (unsigned long long)cputime64_to_clock_t(guest),
  80                 (unsigned long long)cputime64_to_clock_t(guest_nice));
  81         for_each_online_cpu(i) {
  82
  83                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  84                 user = kstat_cpu(i).cpustat.user;
  85                 nice = kstat_cpu(i).cpustat.nice;
  86                 system = kstat_cpu(i).cpustat.system;
  87                 idle = kstat_cpu(i).cpustat.idle;
  88                 idle = cputime64_add(idle, arch_idle_time(i));
  89                 iowait = kstat_cpu(i).cpustat.iowait;
  90                 irq = kstat_cpu(i).cpustat.irq;
  91                 softirq = kstat_cpu(i).cpustat.softirq;
  92                 steal = kstat_cpu(i).cpustat.steal;
  93                 guest = kstat_cpu(i).cpustat.guest;
  94                 guest_nice = kstat_cpu(i).cpustat.guest_nice;
  95                 seq_printf(p,
  96                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  97                         "%llu\n",
  98                         i,
  99                         (unsigned long long)cputime64_to_clock_t(user),
 100                         (unsigned long long)cputime64_to_clock_t(nice),
 101                         (unsigned long long)cputime64_to_clock_t(system),
 102                         (unsigned long long)cputime64_to_clock_t(idle),
 103                         (unsigned long long)cputime64_to_clock_t(iowait),
 104                         (unsigned long long)cputime64_to_clock_t(irq),
 105                         (unsigned long long)cputime64_to_clock_t(softirq),
 106                         (unsigned long long)cputime64_to_clock_t(steal),
 107                         (unsigned long long)cputime64_to_clock_t(guest),
 108                         (unsigned long long)cputime64_to_clock_t(guest_nice));
 109         }
 110         seq_printf(p, "intr %llu", (unsigned long long)sum);
 111
 112         /* sum again ? it could be updated? */
 113         for_each_irq_nr(j) {
 114                 per_irq_sum = 0;
 115                 for_each_possible_cpu(i)
 116                         per_irq_sum += kstat_irqs_cpu(j, i);
 117
 118                 seq_printf(p, " %u", per_irq_sum);
 119         }
 120
 121         seq_printf(p,
 122                 "\nctxt %llu\n"
 123                 "btime %lu\n"
 124                 "processes %lu\n"
 125                 "procs_running %lu\n"
 126                 "procs_blocked %lu\n",
 127                 nr_context_switches(),
 128                 (unsigned long)jif,
 129                 total_forks,
 130                 nr_running(),
 131                 nr_iowait());
 132
 133         seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
 134
 135         for (i = 0; i < NR_SOFTIRQS; i++)
 136                 seq_printf(p, " %u", per_softirq_sums[i]);
 137         seq_printf(p, "\n");
 138
 139         return 0;
 140 }
 141
 142 static int stat_open(struct inode *inode, struct file *file)
 143 {
 144         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 145         char *buf;
 146         struct seq_file *m;
 147         int res;
 148
 149         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 150         if (size > 128 * 1024)
 151                 size = 128 * 1024;
 152         buf = kmalloc(size, GFP_KERNEL);
 153         if (!buf)
 154                 return -ENOMEM;
 155
 156         res = single_open(file, show_stat, NULL);
 157         if (!res) {
 158                 m = file->private_data;
 159                 m->buf = buf;
 160                 m->size = size;
 161         } else
 162                 kfree(buf);
 163         return res;
 164 }
 165
 166 static const struct file_operations proc_stat_operations = {
 167         .open           = stat_open,
 168         .read           = seq_read,
 169         .llseek         = seq_lseek,
 170         .release        = single_release,
 171 };
 172
 173 static int __init proc_stat_init(void)
 174 {
 175         proc_create("stat", 0, NULL, &proc_stat_operations);
 176         return 0;
 177 }
 178 module_init(proc_stat_init);