fs/proc/stat.c

   1 #include <linux/cpumask.h>
   2 #include <linux/fs.h>
   3 #include <linux/gfp.h>
   4 #include <linux/init.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/kernel_stat.h>
   7 #include <linux/proc_fs.h>
   8 #include <linux/sched.h>
   9 #include <linux/seq_file.h>
  10 #include <linux/slab.h>
  11 #include <linux/time.h>
  12 #include <linux/irqnr.h>
  13 #include <asm/cputime.h>
  14
  15 #ifndef arch_irq_stat_cpu
  16 #define arch_irq_stat_cpu(cpu) 0
  17 #endif
  18 #ifndef arch_irq_stat
  19 #define arch_irq_stat() 0
  20 #endif
  21 #ifndef arch_idle_time
  22 #define arch_idle_time(cpu) 0
  23 #endif
  24
  25 static int show_stat(struct seq_file *p, void *v)
  26 {
  27         int i, j;
  28         unsigned long jif;
  29         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
  30         cputime64_t guest, guest_nice;
  31         u64 sum = 0;
  32         u64 sum_softirq = 0;
  33         unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
  34         struct timespec boottime;
  35         unsigned int per_irq_sum;
  36
  37         user = nice = system = idle = iowait =
  38                 irq = softirq = steal = cputime64_zero;
  39         guest = guest_nice = cputime64_zero;
  40         getboottime(&boottime);
  41         jif = boottime.tv_sec;
  42
  43         for_each_possible_cpu(i) {
  44                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
  45                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
  46                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
  47                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
  48                 idle = cputime64_add(idle, arch_idle_time(i));
  49                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
  50                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
  51                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
  52                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
  53                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
  54                 guest_nice = cputime64_add(guest_nice,
  55                         kstat_cpu(i).cpustat.guest_nice);
  56                 for_each_irq_nr(j) {
  57                         sum += kstat_irqs_cpu(j, i);
  58                 }
  59                 sum += arch_irq_stat_cpu(i);
  60
  61                 for (j = 0; j < NR_SOFTIRQS; j++) {
  62                         unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
  63
  64                         per_softirq_sums[j] += softirq_stat;
  65                         sum_softirq += softirq_stat;
  66                 }
  67         }
  68         sum += arch_irq_stat();
  69
  70         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  71                 "%llu\n",
  72                 (unsigned long long)cputime64_to_clock_t(user),
  73                 (unsigned long long)cputime64_to_clock_t(nice),
  74                 (unsigned long long)cputime64_to_clock_t(system),
  75                 (unsigned long long)cputime64_to_clock_t(idle),
  76                 (unsigned long long)cputime64_to_clock_t(iowait),
  77                 (unsigned long long)cputime64_to_clock_t(irq),
  78                 (unsigned long long)cputime64_to_clock_t(softirq),
  79                 (unsigned long long)cputime64_to_clock_t(steal),
  80                 (unsigned long long)cputime64_to_clock_t(guest),
  81                 (unsigned long long)cputime64_to_clock_t(guest_nice));
  82         for_each_online_cpu(i) {
  83
  84                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  85                 user = kstat_cpu(i).cpustat.user;
  86                 nice = kstat_cpu(i).cpustat.nice;
  87                 system = kstat_cpu(i).cpustat.system;
  88                 idle = kstat_cpu(i).cpustat.idle;
  89                 idle = cputime64_add(idle, arch_idle_time(i));
  90                 iowait = kstat_cpu(i).cpustat.iowait;
  91                 irq = kstat_cpu(i).cpustat.irq;
  92                 softirq = kstat_cpu(i).cpustat.softirq;
  93                 steal = kstat_cpu(i).cpustat.steal;
  94                 guest = kstat_cpu(i).cpustat.guest;
  95                 guest_nice = kstat_cpu(i).cpustat.guest_nice;
  96                 seq_printf(p,
  97                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
  98                         "%llu\n",
  99                         i,
 100                         (unsigned long long)cputime64_to_clock_t(user),
 101                         (unsigned long long)cputime64_to_clock_t(nice),
 102                         (unsigned long long)cputime64_to_clock_t(system),
 103                         (unsigned long long)cputime64_to_clock_t(idle),
 104                         (unsigned long long)cputime64_to_clock_t(iowait),
 105                         (unsigned long long)cputime64_to_clock_t(irq),
 106                         (unsigned long long)cputime64_to_clock_t(softirq),
 107                         (unsigned long long)cputime64_to_clock_t(steal),
 108                         (unsigned long long)cputime64_to_clock_t(guest),
 109                         (unsigned long long)cputime64_to_clock_t(guest_nice));
 110         }
 111         seq_printf(p, "intr %llu", (unsigned long long)sum);
 112
 113         /* sum again ? it could be updated? */
 114         for_each_irq_nr(j) {
 115                 per_irq_sum = 0;
 116                 for_each_possible_cpu(i)
 117                         per_irq_sum += kstat_irqs_cpu(j, i);
 118
 119                 seq_printf(p, " %u", per_irq_sum);
 120         }
 121
 122         seq_printf(p,
 123                 "\nctxt %llu\n"
 124                 "btime %lu\n"
 125                 "processes %lu\n"
 126                 "procs_running %lu\n"
 127                 "procs_blocked %lu\n",
 128                 nr_context_switches(),
 129                 (unsigned long)jif,
 130                 total_forks,
 131                 nr_running(),
 132                 nr_iowait());
 133
 134         seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
 135
 136         for (i = 0; i < NR_SOFTIRQS; i++)
 137                 seq_printf(p, " %u", per_softirq_sums[i]);
 138         seq_printf(p, "\n");
 139
 140         return 0;
 141 }
 142
 143 static int stat_open(struct inode *inode, struct file *file)
 144 {
 145         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 146         char *buf;
 147         struct seq_file *m;
 148         int res;
 149
 150         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 151         if (size > 128 * 1024)
 152                 size = 128 * 1024;
 153         buf = kmalloc(size, GFP_KERNEL);
 154         if (!buf)
 155                 return -ENOMEM;
 156
 157         res = single_open(file, show_stat, NULL);
 158         if (!res) {
 159                 m = file->private_data;
 160                 m->buf = buf;
 161                 m->size = size;
 162         } else
 163                 kfree(buf);
 164         return res;
 165 }
 166
 167 static const struct file_operations proc_stat_operations = {
 168         .open           = stat_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = single_release,
 172 };
 173
 174 static int __init proc_stat_init(void)
 175 {
 176         proc_create("stat", 0, NULL, &proc_stat_operations);
 177         return 0;
 178 }
 179 module_init(proc_stat_init);