SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_desc(j, desc) {
  49                         if (!desc)
  50                                 continue;
  51                         sum += kstat_irqs_cpu(j, i);
  52                 }
  53                 sum += arch_irq_stat_cpu(i);
  54         }
  55         sum += arch_irq_stat();
  56
  57         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  58                 (unsigned long long)cputime64_to_clock_t(user),
  59                 (unsigned long long)cputime64_to_clock_t(nice),
  60                 (unsigned long long)cputime64_to_clock_t(system),
  61                 (unsigned long long)cputime64_to_clock_t(idle),
  62                 (unsigned long long)cputime64_to_clock_t(iowait),
  63                 (unsigned long long)cputime64_to_clock_t(irq),
  64                 (unsigned long long)cputime64_to_clock_t(softirq),
  65                 (unsigned long long)cputime64_to_clock_t(steal),
  66                 (unsigned long long)cputime64_to_clock_t(guest));
  67         for_each_online_cpu(i) {
  68
  69                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  70                 user = kstat_cpu(i).cpustat.user;
  71                 nice = kstat_cpu(i).cpustat.nice;
  72                 system = kstat_cpu(i).cpustat.system;
  73                 idle = kstat_cpu(i).cpustat.idle;
  74                 iowait = kstat_cpu(i).cpustat.iowait;
  75                 irq = kstat_cpu(i).cpustat.irq;
  76                 softirq = kstat_cpu(i).cpustat.softirq;
  77                 steal = kstat_cpu(i).cpustat.steal;
  78                 guest = kstat_cpu(i).cpustat.guest;
  79                 seq_printf(p,
  80                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  81                         i,
  82                         (unsigned long long)cputime64_to_clock_t(user),
  83                         (unsigned long long)cputime64_to_clock_t(nice),
  84                         (unsigned long long)cputime64_to_clock_t(system),
  85                         (unsigned long long)cputime64_to_clock_t(idle),
  86                         (unsigned long long)cputime64_to_clock_t(iowait),
  87                         (unsigned long long)cputime64_to_clock_t(irq),
  88                         (unsigned long long)cputime64_to_clock_t(softirq),
  89                         (unsigned long long)cputime64_to_clock_t(steal),
  90                         (unsigned long long)cputime64_to_clock_t(guest));
  91         }
  92         seq_printf(p, "intr %llu", (unsigned long long)sum);
  93
  94         /* sum again ? it could be updated? */
  95         for (j = 0; j < NR_IRQS; j++) {
  96                 desc = irq_to_desc(j);
  97                 per_irq_sum = 0;
  98
  99                 if (desc) {
 100                         for_each_possible_cpu(i)
 101                                 per_irq_sum += kstat_irqs_cpu(j, i);
 102                 }
 103
 104                 seq_printf(p, " %u", per_irq_sum);
 105         }
 106
 107         seq_printf(p,
 108                 "\nctxt %llu\n"
 109                 "btime %lu\n"
 110                 "processes %lu\n"
 111                 "procs_running %lu\n"
 112                 "procs_blocked %lu\n",
 113                 nr_context_switches(),
 114                 (unsigned long)jif,
 115                 total_forks,
 116                 nr_running(),
 117                 nr_iowait());
 118
 119         return 0;
 120 }
 121
 122 static int stat_open(struct inode *inode, struct file *file)
 123 {
 124         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 125         char *buf;
 126         struct seq_file *m;
 127         int res;
 128
 129         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 130         if (size > 128 * 1024)
 131                 size = 128 * 1024;
 132         buf = kmalloc(size, GFP_KERNEL);
 133         if (!buf)
 134                 return -ENOMEM;
 135
 136         res = single_open(file, show_stat, NULL);
 137         if (!res) {
 138                 m = file->private_data;
 139                 m->buf = buf;
 140                 m->size = size;
 141         } else
 142                 kfree(buf);
 143         return res;
 144 }
 145
 146 static const struct file_operations proc_stat_operations = {
 147         .open           = stat_open,
 148         .read           = seq_read,
 149         .llseek         = seq_lseek,
 150         .release        = single_release,
 151 };
 152
 153 static int __init proc_stat_init(void)
 154 {
 155         proc_create("stat", 0, NULL, &proc_stat_operations);
 156         return 0;
 157 }
 158 module_init(proc_stat_init);