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
  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                 for_each_irq_nr(j) {
  48 #ifdef CONFIG_SPARSE_IRQ
  49                         if (!irq_to_desc(j))
  50                                 continue;
  51 #endif
  52                         sum += kstat_irqs_cpu(j, i);
  53                 }
  54                 sum += arch_irq_stat_cpu(i);
  55         }
  56         sum += arch_irq_stat();
  57
  58         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  59                 (unsigned long long)cputime64_to_clock_t(user),
  60                 (unsigned long long)cputime64_to_clock_t(nice),
  61                 (unsigned long long)cputime64_to_clock_t(system),
  62                 (unsigned long long)cputime64_to_clock_t(idle),
  63                 (unsigned long long)cputime64_to_clock_t(iowait),
  64                 (unsigned long long)cputime64_to_clock_t(irq),
  65                 (unsigned long long)cputime64_to_clock_t(softirq),
  66                 (unsigned long long)cputime64_to_clock_t(steal),
  67                 (unsigned long long)cputime64_to_clock_t(guest));
  68         for_each_online_cpu(i) {
  69
  70                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
  71                 user = kstat_cpu(i).cpustat.user;
  72                 nice = kstat_cpu(i).cpustat.nice;
  73                 system = kstat_cpu(i).cpustat.system;
  74                 idle = kstat_cpu(i).cpustat.idle;
  75                 iowait = kstat_cpu(i).cpustat.iowait;
  76                 irq = kstat_cpu(i).cpustat.irq;
  77                 softirq = kstat_cpu(i).cpustat.softirq;
  78                 steal = kstat_cpu(i).cpustat.steal;
  79                 guest = kstat_cpu(i).cpustat.guest;
  80                 seq_printf(p,
  81                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
  82                         i,
  83                         (unsigned long long)cputime64_to_clock_t(user),
  84                         (unsigned long long)cputime64_to_clock_t(nice),
  85                         (unsigned long long)cputime64_to_clock_t(system),
  86                         (unsigned long long)cputime64_to_clock_t(idle),
  87                         (unsigned long long)cputime64_to_clock_t(iowait),
  88                         (unsigned long long)cputime64_to_clock_t(irq),
  89                         (unsigned long long)cputime64_to_clock_t(softirq),
  90                         (unsigned long long)cputime64_to_clock_t(steal),
  91                         (unsigned long long)cputime64_to_clock_t(guest));
  92         }
  93         seq_printf(p, "intr %llu", (unsigned long long)sum);
  94
  95         /* sum again ? it could be updated? */
  96         for_each_irq_nr(j) {
  97                 per_irq_sum = 0;
  98 #ifdef CONFIG_SPARSE_IRQ
  99                 if (!irq_to_desc(j)) {
 100                         seq_printf(p, " %u", per_irq_sum);
 101                         continue;
 102                 }
 103 #endif
 104                 for_each_possible_cpu(i)
 105                         per_irq_sum += kstat_irqs_cpu(j, i);
 106
 107                 seq_printf(p, " %u", per_irq_sum);
 108         }
 109
 110         seq_printf(p,
 111                 "\nctxt %llu\n"
 112                 "btime %lu\n"
 113                 "processes %lu\n"
 114                 "procs_running %lu\n"
 115                 "procs_blocked %lu\n",
 116                 nr_context_switches(),
 117                 (unsigned long)jif,
 118                 total_forks,
 119                 nr_running(),
 120                 nr_iowait());
 121
 122         return 0;
 123 }
 124
 125 static int stat_open(struct inode *inode, struct file *file)
 126 {
 127         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 128         char *buf;
 129         struct seq_file *m;
 130         int res;
 131
 132         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 133         if (size > 128 * 1024)
 134                 size = 128 * 1024;
 135         buf = kmalloc(size, GFP_KERNEL);
 136         if (!buf)
 137                 return -ENOMEM;
 138
 139         res = single_open(file, show_stat, NULL);
 140         if (!res) {
 141                 m = file->private_data;
 142                 m->buf = buf;
 143                 m->size = size;
 144         } else
 145                 kfree(buf);
 146         return res;
 147 }
 148
 149 static const struct file_operations proc_stat_operations = {
 150         .open           = stat_open,
 151         .read           = seq_read,
 152         .llseek         = seq_lseek,
 153         .release        = single_release,
 154 };
 155
 156 static int __init proc_stat_init(void)
 157 {
 158         proc_create("stat", 0, NULL, &proc_stat_operations);
 159         return 0;
 160 }
 161 module_init(proc_stat_init);