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
  22 static int show_stat(struct seq_file *p, void *v)
  23 {
  24         int i, j;
  25         unsigned long jif;
  26         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
  27         cputime64_t guest;
  28         u64 sum = 0;
  29         struct timespec boottime;
  30         unsigned int per_irq_sum;
  31
  32         user = nice = system = idle = iowait =
  33                 irq = softirq = steal = cputime64_zero;
  34         guest = cputime64_zero;
  35         getboottime(&boottime);
  36         jif = boottime.tv_sec;
  37
  38         for_each_possible_cpu(i) {
  39                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
  40                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
  41                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
  42                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
  43                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
  44                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
  45                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
  46                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
  47                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
  48                 for_each_irq_nr(j) {
  49                         sum += kstat_irqs_cpu(j, i);
  50                 }
  51                 sum += arch_irq_stat_cpu(i);
  52         }
  53         sum += arch_irq_stat();
  54
  55         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  56                 (unsigned long long)cputime64_to_clock_t(user),
  57                 (unsigned long long)cputime64_to_clock_t(nice),
  58                 (unsigned long long)cputime64_to_clock_t(system),
  59                 (unsigned long long)cputime64_to_clock_t(idle),
  60                 (unsigned long long)cputime64_to_clock_t(iowait),
  61                 (unsigned long long)cputime64_to_clock_t(irq),
  62                 (unsigned long long)cputime64_to_clock_t(softirq),
  63                 (unsigned long long)cputime64_to_clock_t(steal),
  64                 (unsigned long long)cputime64_to_clock_t(guest));
  65         for_each_online_cpu(i) {
  66
  67                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  68                 user = kstat_cpu(i).cpustat.user;
  69                 nice = kstat_cpu(i).cpustat.nice;
  70                 system = kstat_cpu(i).cpustat.system;
  71                 idle = kstat_cpu(i).cpustat.idle;
  72                 iowait = kstat_cpu(i).cpustat.iowait;
  73                 irq = kstat_cpu(i).cpustat.irq;
  74                 softirq = kstat_cpu(i).cpustat.softirq;
  75                 steal = kstat_cpu(i).cpustat.steal;
  76                 guest = kstat_cpu(i).cpustat.guest;
  77                 seq_printf(p,
  78                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  79                         i,
  80                         (unsigned long long)cputime64_to_clock_t(user),
  81                         (unsigned long long)cputime64_to_clock_t(nice),
  82                         (unsigned long long)cputime64_to_clock_t(system),
  83                         (unsigned long long)cputime64_to_clock_t(idle),
  84                         (unsigned long long)cputime64_to_clock_t(iowait),
  85                         (unsigned long long)cputime64_to_clock_t(irq),
  86                         (unsigned long long)cputime64_to_clock_t(softirq),
  87                         (unsigned long long)cputime64_to_clock_t(steal),
  88                         (unsigned long long)cputime64_to_clock_t(guest));
  89         }
  90         seq_printf(p, "intr %llu", (unsigned long long)sum);
  91
  92         /* sum again ? it could be updated? */
  93         for_each_irq_nr(j) {
  94                 per_irq_sum = 0;
  95                 for_each_possible_cpu(i)
  96                         per_irq_sum += kstat_irqs_cpu(j, i);
  97
  98                 seq_printf(p, " %u", per_irq_sum);
  99         }
 100
 101         seq_printf(p,
 102                 "\nctxt %llu\n"
 103                 "btime %lu\n"
 104                 "processes %lu\n"
 105                 "procs_running %lu\n"
 106                 "procs_blocked %lu\n",
 107                 nr_context_switches(),
 108                 (unsigned long)jif,
 109                 total_forks,
 110                 nr_running(),
 111                 nr_iowait());
 112
 113         return 0;
 114 }
 115
 116 static int stat_open(struct inode *inode, struct file *file)
 117 {
 118         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 119         char *buf;
 120         struct seq_file *m;
 121         int res;
 122
 123         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 124         if (size > 128 * 1024)
 125                 size = 128 * 1024;
 126         buf = kmalloc(size, GFP_KERNEL);
 127         if (!buf)
 128                 return -ENOMEM;
 129
 130         res = single_open(file, show_stat, NULL);
 131         if (!res) {
 132                 m = file->private_data;
 133                 m->buf = buf;
 134                 m->size = size;
 135         } else
 136                 kfree(buf);
 137         return res;
 138 }
 139
 140 static const struct file_operations proc_stat_operations = {
 141         .open           = stat_open,
 142         .read           = seq_read,
 143         .llseek         = seq_lseek,
 144         .release        = single_release,
 145 };
 146
 147 static int __init proc_stat_init(void)
 148 {
 149         proc_create("stat", 0, NULL, &proc_stat_operations);
 150         return 0;
 151 }
 152 module_init(proc_stat_init);