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
21static 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
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
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
117static 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
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
141static 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
148static int __init proc_stat_init(void)
149{
150 proc_create("stat", 0, NULL, &proc_stat_operations);
151 return 0;
152}
153module_init(proc_stat_init);
154
