blob: 2a30d67dd6b81ea03c71b3bdea4fa50913a09ae4 [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>
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 Schwidefskye1c80532009-04-23 13:58:08 +020021#ifndef arch_idle_time
22#define arch_idle_time(cpu) 0
23#endif
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040024
Michal Hockoa25cac52011-08-24 09:40:25 +020025static cputime64_t get_idle_time(int cpu)
26{
27 u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
28 cputime64_t idle;
29
30 if (idle_time == -1ULL) {
31 /* !NO_HZ so we can rely on cpustat.idle */
32 idle = kstat_cpu(cpu).cpustat.idle;
33 idle = cputime64_add(idle, arch_idle_time(cpu));
34 } else
Michal Hocko2a95ea62011-12-08 14:34:32 -080035 idle = nsecs_to_jiffies64(1000 * idle_time);
Michal Hockoa25cac52011-08-24 09:40:25 +020036
37 return idle;
38}
39
40static cputime64_t get_iowait_time(int cpu)
41{
42 u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
43 cputime64_t iowait;
44
45 if (iowait_time == -1ULL)
46 /* !NO_HZ so we can rely on cpustat.iowait */
47 iowait = kstat_cpu(cpu).cpustat.iowait;
48 else
Michal Hocko2a95ea62011-12-08 14:34:32 -080049 iowait = nsecs_to_jiffies64(1000 * iowait_time);
Michal Hockoa25cac52011-08-24 09:40:25 +020050
51 return iowait;
52}
53
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040054static int show_stat(struct seq_file *p, void *v)
55{
56 int i, j;
57 unsigned long jif;
58 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
Ryota Ozakice0e7b22009-10-24 01:20:10 +090059 cputime64_t guest, guest_nice;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040060 u64 sum = 0;
Keika Kobayashid3d64df2009-06-17 16:25:55 -070061 u64 sum_softirq = 0;
62 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040063 struct timespec boottime;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040064
65 user = nice = system = idle = iowait =
66 irq = softirq = steal = cputime64_zero;
Ryota Ozakice0e7b22009-10-24 01:20:10 +090067 guest = guest_nice = cputime64_zero;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040068 getboottime(&boottime);
69 jif = boottime.tv_sec;
70
71 for_each_possible_cpu(i) {
72 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
73 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
74 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
Michal Hockoa25cac52011-08-24 09:40:25 +020075 idle = cputime64_add(idle, get_idle_time(i));
76 iowait = cputime64_add(iowait, get_iowait_time(i));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040077 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
78 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
79 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
80 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
Ryota Ozakice0e7b22009-10-24 01:20:10 +090081 guest_nice = cputime64_add(guest_nice,
82 kstat_cpu(i).cpustat.guest_nice);
KAMEZAWA Hiroyukif2c66cd2010-10-27 15:34:13 -070083 sum += kstat_cpu_irqs_sum(i);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040084 sum += arch_irq_stat_cpu(i);
Keika Kobayashid3d64df2009-06-17 16:25:55 -070085
86 for (j = 0; j < NR_SOFTIRQS; j++) {
87 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
88
89 per_softirq_sums[j] += softirq_stat;
90 sum_softirq += softirq_stat;
91 }
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040092 }
93 sum += arch_irq_stat();
94
Ryota Ozakice0e7b22009-10-24 01:20:10 +090095 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu "
96 "%llu\n",
Alexey Dobriyandf8106d2008-10-05 00:01:56 +040097 (unsigned long long)cputime64_to_clock_t(user),
98 (unsigned long long)cputime64_to_clock_t(nice),
99 (unsigned long long)cputime64_to_clock_t(system),
100 (unsigned long long)cputime64_to_clock_t(idle),
101 (unsigned long long)cputime64_to_clock_t(iowait),
102 (unsigned long long)cputime64_to_clock_t(irq),
103 (unsigned long long)cputime64_to_clock_t(softirq),
104 (unsigned long long)cputime64_to_clock_t(steal),
Ryota Ozakice0e7b22009-10-24 01:20:10 +0900105 (unsigned long long)cputime64_to_clock_t(guest),
106 (unsigned long long)cputime64_to_clock_t(guest_nice));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400107 for_each_online_cpu(i) {
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400108 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
109 user = kstat_cpu(i).cpustat.user;
110 nice = kstat_cpu(i).cpustat.nice;
111 system = kstat_cpu(i).cpustat.system;
Michal Hockoa25cac52011-08-24 09:40:25 +0200112 idle = get_idle_time(i);
113 iowait = get_iowait_time(i);
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400114 irq = kstat_cpu(i).cpustat.irq;
115 softirq = kstat_cpu(i).cpustat.softirq;
116 steal = kstat_cpu(i).cpustat.steal;
117 guest = kstat_cpu(i).cpustat.guest;
Ryota Ozakice0e7b22009-10-24 01:20:10 +0900118 guest_nice = kstat_cpu(i).cpustat.guest_nice;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400119 seq_printf(p,
Ryota Ozakice0e7b22009-10-24 01:20:10 +0900120 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
121 "%llu\n",
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400122 i,
123 (unsigned long long)cputime64_to_clock_t(user),
124 (unsigned long long)cputime64_to_clock_t(nice),
125 (unsigned long long)cputime64_to_clock_t(system),
126 (unsigned long long)cputime64_to_clock_t(idle),
127 (unsigned long long)cputime64_to_clock_t(iowait),
128 (unsigned long long)cputime64_to_clock_t(irq),
129 (unsigned long long)cputime64_to_clock_t(softirq),
130 (unsigned long long)cputime64_to_clock_t(steal),
Ryota Ozakice0e7b22009-10-24 01:20:10 +0900131 (unsigned long long)cputime64_to_clock_t(guest),
132 (unsigned long long)cputime64_to_clock_t(guest_nice));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400133 }
134 seq_printf(p, "intr %llu", (unsigned long long)sum);
135
136 /* sum again ? it could be updated? */
KAMEZAWA Hiroyuki478735e32010-10-27 15:34:15 -0700137 for_each_irq_nr(j)
138 seq_printf(p, " %u", kstat_irqs(j));
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400139
140 seq_printf(p,
141 "\nctxt %llu\n"
142 "btime %lu\n"
143 "processes %lu\n"
144 "procs_running %lu\n"
145 "procs_blocked %lu\n",
146 nr_context_switches(),
147 (unsigned long)jif,
148 total_forks,
149 nr_running(),
150 nr_iowait());
151
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700152 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
153
154 for (i = 0; i < NR_SOFTIRQS; i++)
155 seq_printf(p, " %u", per_softirq_sums[i]);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800156 seq_putc(p, '\n');
Keika Kobayashid3d64df2009-06-17 16:25:55 -0700157
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400158 return 0;
159}
160
161static int stat_open(struct inode *inode, struct file *file)
162{
163 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
164 char *buf;
165 struct seq_file *m;
166 int res;
167
Yuanhan Liua4dbf0e2011-05-26 16:25:51 -0700168 /* don't ask for more than the kmalloc() max size */
169 if (size > KMALLOC_MAX_SIZE)
170 size = KMALLOC_MAX_SIZE;
Alexey Dobriyandf8106d2008-10-05 00:01:56 +0400171 buf = kmalloc(size, GFP_KERNEL);
172 if (!buf)
173 return -ENOMEM;
174
175 res = single_open(file, show_stat, NULL);
176 if (!res) {
177 m = file->private_data;
178 m->buf = buf;
179 m->size = size;
180 } else
181 kfree(buf);
182 return res;
183}
184
185static const struct file_operations proc_stat_operations = {
186 .open = stat_open,
187 .read = seq_read,
188 .llseek = seq_lseek,
189 .release = single_release,
190};
191
192static int __init proc_stat_init(void)
193{
194 proc_create("stat", 0, NULL, &proc_stat_operations);
195 return 0;
196}
197module_init(proc_stat_init);