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;
  31         u64 sum = 0;
  32         struct timespec boottime;
  33         unsigned int per_irq_sum;
  34
  35         user = nice = system = idle = iowait =
  36                 irq = softirq = steal = cputime64_zero;
  37         guest = 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                 for_each_irq_nr(j) {
  53                         sum += kstat_irqs_cpu(j, i);
  54                 }
  55                 sum += arch_irq_stat_cpu(i);
  56         }
  57         sum += arch_irq_stat();
  58
  59         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  60                 (unsigned long long)cputime64_to_clock_t(user),
  61                 (unsigned long long)cputime64_to_clock_t(nice),
  62                 (unsigned long long)cputime64_to_clock_t(system),
  63                 (unsigned long long)cputime64_to_clock_t(idle),
  64                 (unsigned long long)cputime64_to_clock_t(iowait),
  65                 (unsigned long long)cputime64_to_clock_t(irq),
  66                 (unsigned long long)cputime64_to_clock_t(softirq),
  67                 (unsigned long long)cputime64_to_clock_t(steal),
  68                 (unsigned long long)cputime64_to_clock_t(guest));
  69         for_each_online_cpu(i) {
  70
  71                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  72                 user = kstat_cpu(i).cpustat.user;
  73                 nice = kstat_cpu(i).cpustat.nice;
  74                 system = kstat_cpu(i).cpustat.system;
  75                 idle = kstat_cpu(i).cpustat.idle;
  76                 idle = cputime64_add(idle, arch_idle_time(i));
  77                 iowait = kstat_cpu(i).cpustat.iowait;
  78                 irq = kstat_cpu(i).cpustat.irq;
  79                 softirq = kstat_cpu(i).cpustat.softirq;
  80                 steal = kstat_cpu(i).cpustat.steal;
  81                 guest = kstat_cpu(i).cpustat.guest;
  82                 seq_printf(p,
  83                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  84                         i,
  85                         (unsigned long long)cputime64_to_clock_t(user),
  86                         (unsigned long long)cputime64_to_clock_t(nice),
  87                         (unsigned long long)cputime64_to_clock_t(system),
  88                         (unsigned long long)cputime64_to_clock_t(idle),
  89                         (unsigned long long)cputime64_to_clock_t(iowait),
  90                         (unsigned long long)cputime64_to_clock_t(irq),
  91                         (unsigned long long)cputime64_to_clock_t(softirq),
  92                         (unsigned long long)cputime64_to_clock_t(steal),
  93                         (unsigned long long)cputime64_to_clock_t(guest));
  94         }
  95         seq_printf(p, "intr %llu", (unsigned long long)sum);
  96
  97         /* sum again ? it could be updated? */
  98         for_each_irq_nr(j) {
  99                 per_irq_sum = 0;
 100                 for_each_possible_cpu(i)
 101                         per_irq_sum += kstat_irqs_cpu(j, i);
 102
 103                 seq_printf(p, " %u", per_irq_sum);
 104         }
 105
 106         seq_printf(p,
 107                 "\nctxt %llu\n"
 108                 "btime %lu\n"
 109                 "processes %lu\n"
 110                 "procs_running %lu\n"
 111                 "procs_blocked %lu\n",
 112                 nr_context_switches(),
 113                 (unsigned long)jif,
 114                 total_forks,
 115                 nr_running(),
 116                 nr_iowait());
 117
 118         return 0;
 119 }
 120
 121 static int stat_open(struct inode *inode, struct file *file)
 122 {
 123         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 124         char *buf;
 125         struct seq_file *m;
 126         int res;
 127
 128         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 129         if (size > 128 * 1024)
 130                 size = 128 * 1024;
 131         buf = kmalloc(size, GFP_KERNEL);
 132         if (!buf)
 133                 return -ENOMEM;
 134
 135         res = single_open(file, show_stat, NULL);
 136         if (!res) {
 137                 m = file->private_data;
 138                 m->buf = buf;
 139                 m->size = size;
 140         } else
 141                 kfree(buf);
 142         return res;
 143 }
 144
 145 static const struct file_operations proc_stat_operations = {
 146         .open           = stat_open,
 147         .read           = seq_read,
 148         .llseek         = seq_lseek,
 149         .release        = single_release,
 150 };
 151
 152 static int __init proc_stat_init(void)
 153 {
 154         proc_create("stat", 0, NULL, &proc_stat_operations);
 155         return 0;
 156 }
 157 module_init(proc_stat_init);