blob: d700c42b357263b8e5106a7aed6fe1e301a7892c [file] [log] [blame]
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>
Frederic Weisbeckerbfc3f022014-03-05 16:33:42 +010012#include <linux/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;
Glauber Costa3292beb2011-11-28 14:45:17 -020083 u64 user, nice, system, idle, iowait, irq, softirq, steal;
84 u64 guest, guest_nice;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040085 u64 sum = 0;
Keika Kobayashid3d64df2009-06-17 16:25:55 -070086 u64 sum_softirq = 0;
87 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
Arnd Bergmann519ded52016-08-02 14:03:22 -070088 struct timespec64 boottime;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040089
90 user = nice = system = idle = iowait =
Glauber Costa3292beb2011-11-28 14:45:17 -020091 irq = softirq = steal = 0;
92 guest = guest_nice = 0;
Arnd Bergmann519ded52016-08-02 14:03:22 -070093 getboottime64(&boottime);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040094
95 for_each_possible_cpu(i) {
Glauber Costa3292beb2011-11-28 14:45:17 -020096 user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
97 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
98 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
99 idle += get_idle_time(i);
100 iowait += get_iowait_time(i);
101 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
102 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
103 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
104 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
105 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
Russell Kingf7e67462012-01-14 00:01:01 +0000106 sum += kstat_cpu_irqs_sum(i);
107 sum += arch_irq_stat_cpu(i);
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700108
109 for (j = 0; j < NR_SOFTIRQS; j++) {
110 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
111
112 per_softirq_sums[j] += softirq_stat;
113 sum_softirq += softirq_stat;
114 }
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400115 }
116 sum += arch_irq_stat();
117
Joe Perches75ba1d02016-10-07 17:02:20 -0700118 seq_put_decimal_ull(p, "cpu ", cputime64_to_clock_t(user));
119 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice));
120 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system));
121 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle));
122 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait));
123 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq));
124 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq));
125 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal));
126 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest));
127 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice));
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700128 seq_putc(p, '\n');
129
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400130 for_each_online_cpu(i) {
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400131 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
Glauber Costa3292beb2011-11-28 14:45:17 -0200132 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
133 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
134 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
Michal Hockoa25cac52011-08-24 09:40:25 +0200135 idle = get_idle_time(i);
136 iowait = get_iowait_time(i);
Glauber Costa3292beb2011-11-28 14:45:17 -0200137 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
138 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
139 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
140 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
141 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700142 seq_printf(p, "cpu%d", i);
Joe Perches75ba1d02016-10-07 17:02:20 -0700143 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(user));
144 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice));
145 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system));
146 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle));
147 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait));
148 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq));
149 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq));
150 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal));
151 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest));
152 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice));
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700153 seq_putc(p, '\n');
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400154 }
Joe Perches75ba1d02016-10-07 17:02:20 -0700155 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400156
157 /* sum again ? it could be updated? */
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700158 for_each_irq_nr(j)
Joe Perches75ba1d02016-10-07 17:02:20 -0700159 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400160
161 seq_printf(p,
162 "\nctxt %llu\n"
Arnd Bergmann519ded52016-08-02 14:03:22 -0700163 "btime %llu\n"
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400164 "processes %lu\n"
165 "procs_running %lu\n"
166 "procs_blocked %lu\n",
167 nr_context_switches(),
Arnd Bergmann519ded52016-08-02 14:03:22 -0700168 (unsigned long long)boottime.tv_sec,
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400169 total_forks,
170 nr_running(),
171 nr_iowait());
172
Joe Perches75ba1d02016-10-07 17:02:20 -0700173 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700174
175 for (i = 0; i < NR_SOFTIRQS; i++)
Joe Perches75ba1d02016-10-07 17:02:20 -0700176 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800177 seq_putc(p, '\n');
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700178
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400179 return 0;
180}
181
182static int stat_open(struct inode *inode, struct file *file)
183{
Heiko Carstensf74373a2014-07-02 15:22:37 -0700184 size_t size = 1024 + 128 * num_online_cpus();
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400185
Eric Dumazet59a32e22012-03-23 15:02:53 -0700186 /* minimum size to display an interrupt count : 2 bytes */
187 size += 2 * nr_irqs;
Heiko Carstensf74373a2014-07-02 15:22:37 -0700188 return single_open_size(file, show_stat, NULL, size);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400189}
190
191static const struct file_operations proc_stat_operations = {
192 .open = stat_open,
193 .read = seq_read,
194 .llseek = seq_lseek,
195 .release = single_release,
196};
197
198static int __init proc_stat_init(void)
199{
200 proc_create("stat", 0, NULL, &proc_stat_operations);
201 return 0;
202}
Paul Gortmakerabaf3782014-01-23 15:55:45 -0800203fs_initcall(proc_stat_init);