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Alexey Dobriyandf8106d2008-10-05 00:01:56 +04001#include <linux/cpumask.h>
2#include <linux/fs.h>
Alexey Dobriyandf8106d2008-10-05 00:01:56 +04003#include <linux/init.h>
4#include <linux/interrupt.h>
5#include <linux/kernel_stat.h>
6#include <linux/proc_fs.h>
7#include <linux/sched.h>
8#include <linux/seq_file.h>
9#include <linux/slab.h>
10#include <linux/time.h>
KOSAKI Motohiro26ddd8d2008-12-26 14:24:10 +090011#include <linux/irqnr.h>
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040012#include <asm/cputime.h>
Michal Hockoa25cac52011-08-24 09:40:25 +020013#include <linux/tick.h>
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040014
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
Martin Schwidefskycb85a6e2012-03-30 12:23:08 +020021
22#ifdef arch_idle_time
23
24static cputime64_t get_idle_time(int cpu)
25{
26 cputime64_t idle;
27
28 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
29 if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
30 idle += arch_idle_time(cpu);
31 return idle;
32}
33
34static cputime64_t get_iowait_time(int cpu)
35{
36 cputime64_t iowait;
37
38 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
39 if (cpu_online(cpu) && nr_iowait_cpu(cpu))
40 iowait += arch_idle_time(cpu);
41 return iowait;
42}
43
44#else
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040045
Glauber Costa3292beb2011-11-28 14:45:17 -020046static u64 get_idle_time(int cpu)
Michal Hockoa25cac52011-08-24 09:40:25 +020047{
Michal Hocko7386cdb2012-10-10 11:51:09 +053048 u64 idle, idle_time = -1ULL;
49
50 if (cpu_online(cpu))
51 idle_time = get_cpu_idle_time_us(cpu, NULL);
Michal Hockoa25cac52011-08-24 09:40:25 +020052
Martin Schwidefskycb85a6e2012-03-30 12:23:08 +020053 if (idle_time == -1ULL)
Michal Hocko7386cdb2012-10-10 11:51:09 +053054 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
Glauber Costa3292beb2011-11-28 14:45:17 -020055 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
Martin Schwidefskycb85a6e2012-03-30 12:23:08 +020056 else
Andreas Schwab34845632011-12-28 15:57:15 -080057 idle = usecs_to_cputime64(idle_time);
Michal Hockoa25cac52011-08-24 09:40:25 +020058
59 return idle;
60}
61
Glauber Costa3292beb2011-11-28 14:45:17 -020062static u64 get_iowait_time(int cpu)
Michal Hockoa25cac52011-08-24 09:40:25 +020063{
Michal Hocko7386cdb2012-10-10 11:51:09 +053064 u64 iowait, iowait_time = -1ULL;
65
66 if (cpu_online(cpu))
67 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
Michal Hockoa25cac52011-08-24 09:40:25 +020068
69 if (iowait_time == -1ULL)
Michal Hocko7386cdb2012-10-10 11:51:09 +053070 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
Glauber Costa3292beb2011-11-28 14:45:17 -020071 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
Michal Hockoa25cac52011-08-24 09:40:25 +020072 else
Andreas Schwab34845632011-12-28 15:57:15 -080073 iowait = usecs_to_cputime64(iowait_time);
Michal Hockoa25cac52011-08-24 09:40:25 +020074
75 return iowait;
76}
77
Martin Schwidefskycb85a6e2012-03-30 12:23:08 +020078#endif
79
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040080static int show_stat(struct seq_file *p, void *v)
81{
82 int i, j;
83 unsigned long jif;
Glauber Costa3292beb2011-11-28 14:45:17 -020084 u64 user, nice, system, idle, iowait, irq, softirq, steal;
85 u64 guest, guest_nice;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040086 u64 sum = 0;
Keika Kobayashid3d64df2009-06-17 16:25:55 -070087 u64 sum_softirq = 0;
88 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040089 struct timespec boottime;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040090
91 user = nice = system = idle = iowait =
Glauber Costa3292beb2011-11-28 14:45:17 -020092 irq = softirq = steal = 0;
93 guest = guest_nice = 0;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040094 getboottime(&boottime);
95 jif = boottime.tv_sec;
96
97 for_each_possible_cpu(i) {
Glauber Costa3292beb2011-11-28 14:45:17 -020098 user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
99 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
100 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
101 idle += get_idle_time(i);
102 iowait += get_iowait_time(i);
103 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
104 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
105 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
106 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
107 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
Russell Kingf7e67462012-01-14 00:01:01 +0000108 sum += kstat_cpu_irqs_sum(i);
109 sum += arch_irq_stat_cpu(i);
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700110
111 for (j = 0; j < NR_SOFTIRQS; j++) {
112 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
113
114 per_softirq_sums[j] += softirq_stat;
115 sum_softirq += softirq_stat;
116 }
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400117 }
118 sum += arch_irq_stat();
119
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700120 seq_puts(p, "cpu ");
121 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
122 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
123 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
124 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
125 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
126 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
127 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
128 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
129 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
130 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
131 seq_putc(p, '\n');
132
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400133 for_each_online_cpu(i) {
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400134 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
Glauber Costa3292beb2011-11-28 14:45:17 -0200135 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
136 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
137 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
Michal Hockoa25cac52011-08-24 09:40:25 +0200138 idle = get_idle_time(i);
139 iowait = get_iowait_time(i);
Glauber Costa3292beb2011-11-28 14:45:17 -0200140 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
141 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
142 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
143 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
144 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700145 seq_printf(p, "cpu%d", i);
146 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
147 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
148 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
149 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
150 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
151 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
152 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
153 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
154 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
155 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
156 seq_putc(p, '\n');
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400157 }
158 seq_printf(p, "intr %llu", (unsigned long long)sum);
159
160 /* sum again ? it could be updated? */
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700161 for_each_irq_nr(j)
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700162 seq_put_decimal_ull(p, ' ', kstat_irqs(j));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400163
164 seq_printf(p,
165 "\nctxt %llu\n"
166 "btime %lu\n"
167 "processes %lu\n"
168 "procs_running %lu\n"
169 "procs_blocked %lu\n",
170 nr_context_switches(),
171 (unsigned long)jif,
172 total_forks,
173 nr_running(),
174 nr_iowait());
175
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700176 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
177
178 for (i = 0; i < NR_SOFTIRQS; i++)
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700179 seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800180 seq_putc(p, '\n');
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700181
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400182 return 0;
183}
184
185static int stat_open(struct inode *inode, struct file *file)
186{
Eric Dumazet59a32e22012-03-23 15:02:53 -0700187 unsigned size = 1024 + 128 * num_possible_cpus();
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400188 char *buf;
189 struct seq_file *m;
190 int res;
191
Eric Dumazet59a32e22012-03-23 15:02:53 -0700192 /* minimum size to display an interrupt count : 2 bytes */
193 size += 2 * nr_irqs;
194
Yuanhan Liua4dbf0e2011-05-26 16:25:51 -0700195 /* don't ask for more than the kmalloc() max size */
196 if (size > KMALLOC_MAX_SIZE)
197 size = KMALLOC_MAX_SIZE;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400198 buf = kmalloc(size, GFP_KERNEL);
199 if (!buf)
200 return -ENOMEM;
201
202 res = single_open(file, show_stat, NULL);
203 if (!res) {
204 m = file->private_data;
205 m->buf = buf;
Eric Dumazet59a32e22012-03-23 15:02:53 -0700206 m->size = ksize(buf);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400207 } else
208 kfree(buf);
209 return res;
210}
211
212static const struct file_operations proc_stat_operations = {
213 .open = stat_open,
214 .read = seq_read,
215 .llseek = seq_lseek,
216 .release = single_release,
217};
218
219static int __init proc_stat_init(void)
220{
221 proc_create("stat", 0, NULL, &proc_stat_operations);
222 return 0;
223}
224module_init(proc_stat_init);