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 <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
  21 static int show_stat(struct seq_file *p, void *v)
  22 {
  23         int i, j;
  24         unsigned long jif;
  25         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
  26         cputime64_t guest;
  27         u64 sum = 0;
  28         struct timespec boottime;
  29         unsigned int per_irq_sum;
  30
  31         user = nice = system = idle = iowait =
  32                 irq = softirq = steal = cputime64_zero;
  33         guest = cputime64_zero;
  34         getboottime(&boottime);
  35         jif = boottime.tv_sec;
  36
  37         for_each_possible_cpu(i) {
  38                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
  39                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
  40                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
  41                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
  42                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
  43                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
  44                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
  45                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
  46                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
  47
  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
  96                 for_each_possible_cpu(i)
  97                         per_irq_sum += kstat_irqs_cpu(j, i);
  98
  99                 seq_printf(p, " %u", per_irq_sum);
 100         }
 101
 102         seq_printf(p,
 103                 "\nctxt %llu\n"
 104                 "btime %lu\n"
 105                 "processes %lu\n"
 106                 "procs_running %lu\n"
 107                 "procs_blocked %lu\n",
 108                 nr_context_switches(),
 109                 (unsigned long)jif,
 110                 total_forks,
 111                 nr_running(),
 112                 nr_iowait());
 113
 114         return 0;
 115 }
 116
 117 static int stat_open(struct inode *inode, struct file *file)
 118 {
 119         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 120         char *buf;
 121         struct seq_file *m;
 122         int res;
 123
 124         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 125         if (size > 128 * 1024)
 126                 size = 128 * 1024;
 127         buf = kmalloc(size, GFP_KERNEL);
 128         if (!buf)
 129                 return -ENOMEM;
 130
 131         res = single_open(file, show_stat, NULL);
 132         if (!res) {
 133                 m = file->private_data;
 134                 m->buf = buf;
 135                 m->size = size;
 136         } else
 137                 kfree(buf);
 138         return res;
 139 }
 140
 141 static const struct file_operations proc_stat_operations = {
 142         .open           = stat_open,
 143         .read           = seq_read,
 144         .llseek         = seq_lseek,
 145         .release        = single_release,
 146 };
 147
 148 static int __init proc_stat_init(void)
 149 {
 150         proc_create("stat", 0, NULL, &proc_stat_operations);
 151         return 0;
 152 }
 153 module_init(proc_stat_init);