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