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         struct irq_desc *desc;
  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 #ifdef CONFIG_SPARSE_IRQ
  50                         desc = irq_to_desc(j);
  51                         if (!desc)
  52                                 continue;
  53 #endif
  54                         sum += kstat_irqs_cpu(j, i);
  55                 }
  56                 sum += arch_irq_stat_cpu(i);
  57         }
  58         sum += arch_irq_stat();
  59
  60         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  61                 (unsigned long long)cputime64_to_clock_t(user),
  62                 (unsigned long long)cputime64_to_clock_t(nice),
  63                 (unsigned long long)cputime64_to_clock_t(system),
  64                 (unsigned long long)cputime64_to_clock_t(idle),
  65                 (unsigned long long)cputime64_to_clock_t(iowait),
  66                 (unsigned long long)cputime64_to_clock_t(irq),
  67                 (unsigned long long)cputime64_to_clock_t(softirq),
  68                 (unsigned long long)cputime64_to_clock_t(steal),
  69                 (unsigned long long)cputime64_to_clock_t(guest));
  70         for_each_online_cpu(i) {
  71
  72                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  73                 user = kstat_cpu(i).cpustat.user;
  74                 nice = kstat_cpu(i).cpustat.nice;
  75                 system = kstat_cpu(i).cpustat.system;
  76                 idle = kstat_cpu(i).cpustat.idle;
  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 #ifdef CONFIG_SPARSE_IRQ
 101                 desc = irq_to_desc(j);
 102                 if (!desc) {
 103                         seq_printf(p, " %u", per_irq_sum);
 104                         continue;
 105                 }
 106 #endif
 107                 for_each_possible_cpu(i)
 108                         per_irq_sum += kstat_irqs_cpu(j, i);
 109
 110                 seq_printf(p, " %u", per_irq_sum);
 111         }
 112
 113         seq_printf(p,
 114                 "\nctxt %llu\n"
 115                 "btime %lu\n"
 116                 "processes %lu\n"
 117                 "procs_running %lu\n"
 118                 "procs_blocked %lu\n",
 119                 nr_context_switches(),
 120                 (unsigned long)jif,
 121                 total_forks,
 122                 nr_running(),
 123                 nr_iowait());
 124
 125         return 0;
 126 }
 127
 128 static int stat_open(struct inode *inode, struct file *file)
 129 {
 130         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 131         char *buf;
 132         struct seq_file *m;
 133         int res;
 134
 135         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 136         if (size > 128 * 1024)
 137                 size = 128 * 1024;
 138         buf = kmalloc(size, GFP_KERNEL);
 139         if (!buf)
 140                 return -ENOMEM;
 141
 142         res = single_open(file, show_stat, NULL);
 143         if (!res) {
 144                 m = file->private_data;
 145                 m->buf = buf;
 146                 m->size = size;
 147         } else
 148                 kfree(buf);
 149         return res;
 150 }
 151
 152 static const struct file_operations proc_stat_operations = {
 153         .open           = stat_open,
 154         .read           = seq_read,
 155         .llseek         = seq_lseek,
 156         .release        = single_release,
 157 };
 158
 159 static int __init proc_stat_init(void)
 160 {
 161         proc_create("stat", 0, NULL, &proc_stat_operations);
 162         return 0;
 163 }
 164 module_init(proc_stat_init);