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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/cpumask.h>
3#include <linux/fs.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/sched/stat.h>
10#include <linux/seq_file.h>
11#include <linux/slab.h>
12#include <linux/time.h>
13#include <linux/irqnr.h>
14#include <linux/sched/cputime.h>
15#include <linux/tick.h>
16
17#ifndef arch_irq_stat_cpu
18#define arch_irq_stat_cpu(cpu) 0
19#endif
20#ifndef arch_irq_stat
21#define arch_irq_stat() 0
22#endif
23
24#ifdef arch_idle_time
25
26static u64 get_idle_time(int cpu)
27{
28 u64 idle;
29
30 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
31 if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
32 idle += arch_idle_time(cpu);
33 return idle;
34}
35
36static u64 get_iowait_time(int cpu)
37{
38 u64 iowait;
39
40 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
41 if (cpu_online(cpu) && nr_iowait_cpu(cpu))
42 iowait += arch_idle_time(cpu);
43 return iowait;
44}
45
46#else
47
48static u64 get_idle_time(int cpu)
49{
50 u64 idle, idle_usecs = -1ULL;
51
52 if (cpu_online(cpu))
53 idle_usecs = get_cpu_idle_time_us(cpu, NULL);
54
55 if (idle_usecs == -1ULL)
56 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
57 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
58 else
59 idle = idle_usecs * NSEC_PER_USEC;
60
61 return idle;
62}
63
64static u64 get_iowait_time(int cpu)
65{
66 u64 iowait, iowait_usecs = -1ULL;
67
68 if (cpu_online(cpu))
69 iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
70
71 if (iowait_usecs == -1ULL)
72 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
73 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
74 else
75 iowait = iowait_usecs * NSEC_PER_USEC;
76
77 return iowait;
78}
79
80#endif
81
82static int show_stat(struct seq_file *p, void *v)
83{
84 int i, j;
85 u64 user, nice, system, idle, iowait, irq, softirq, steal;
86 u64 guest, guest_nice;
87 u64 sum = 0;
88 u64 sum_softirq = 0;
89 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
90 struct timespec64 boottime;
91
92 user = nice = system = idle = iowait =
93 irq = softirq = steal = 0;
94 guest = guest_nice = 0;
95 getboottime64(&boottime);
96
97 for_each_possible_cpu(i) {
98 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];
108 sum += kstat_cpu_irqs_sum(i);
109 sum += arch_irq_stat_cpu(i);
110
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 }
117 }
118 sum += arch_irq_stat();
119
120 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));
121 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
122 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
123 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
124 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
125 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
126 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
127 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
128 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
129 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
130 seq_putc(p, '\n');
131
132 for_each_online_cpu(i) {
133 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
134 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
135 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
136 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
137 idle = get_idle_time(i);
138 iowait = get_iowait_time(i);
139 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
140 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
141 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
142 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
143 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
144 seq_printf(p, "cpu%d", i);
145 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
146 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
147 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
148 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
149 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
150 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
151 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
152 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
153 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
154 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
155 seq_putc(p, '\n');
156 }
157 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
158
159 /* sum again ? it could be updated? */
160 for_each_irq_nr(j)
161 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j));
162
163 seq_printf(p,
164 "\nctxt %llu\n"
165 "btime %llu\n"
166 "processes %lu\n"
167 "procs_running %lu\n"
168 "procs_blocked %lu\n",
169 nr_context_switches(),
170 (unsigned long long)boottime.tv_sec,
171 total_forks,
172 nr_running(),
173 nr_iowait());
174
175 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
176
177 for (i = 0; i < NR_SOFTIRQS; i++)
178 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
179 seq_putc(p, '\n');
180
181 return 0;
182}
183
184static int stat_open(struct inode *inode, struct file *file)
185{
186 size_t size = 1024 + 128 * num_online_cpus();
187
188 /* minimum size to display an interrupt count : 2 bytes */
189 size += 2 * nr_irqs;
190 return single_open_size(file, show_stat, NULL, size);
191}
192
193static const struct file_operations proc_stat_operations = {
194 .open = stat_open,
195 .read = seq_read,
196 .llseek = seq_lseek,
197 .release = single_release,
198};
199
200static int __init proc_stat_init(void)
201{
202 proc_create("stat", 0, NULL, &proc_stat_operations);
203 return 0;
204}
205fs_initcall(proc_stat_init);
1#include <linux/cpumask.h>
2#include <linux/fs.h>
3#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>
11#include <linux/irqnr.h>
12#include <linux/cputime.h>
13#include <linux/tick.h>
14
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
21
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
45
46static u64 get_idle_time(int cpu)
47{
48 u64 idle, idle_time = -1ULL;
49
50 if (cpu_online(cpu))
51 idle_time = get_cpu_idle_time_us(cpu, NULL);
52
53 if (idle_time == -1ULL)
54 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
55 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
56 else
57 idle = usecs_to_cputime64(idle_time);
58
59 return idle;
60}
61
62static u64 get_iowait_time(int cpu)
63{
64 u64 iowait, iowait_time = -1ULL;
65
66 if (cpu_online(cpu))
67 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
68
69 if (iowait_time == -1ULL)
70 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
71 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
72 else
73 iowait = usecs_to_cputime64(iowait_time);
74
75 return iowait;
76}
77
78#endif
79
80static int show_stat(struct seq_file *p, void *v)
81{
82 int i, j;
83 u64 user, nice, system, idle, iowait, irq, softirq, steal;
84 u64 guest, guest_nice;
85 u64 sum = 0;
86 u64 sum_softirq = 0;
87 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
88 struct timespec64 boottime;
89
90 user = nice = system = idle = iowait =
91 irq = softirq = steal = 0;
92 guest = guest_nice = 0;
93 getboottime64(&boottime);
94
95 for_each_possible_cpu(i) {
96 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];
106 sum += kstat_cpu_irqs_sum(i);
107 sum += arch_irq_stat_cpu(i);
108
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 }
115 }
116 sum += arch_irq_stat();
117
118 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));
128 seq_putc(p, '\n');
129
130 for_each_online_cpu(i) {
131 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
132 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
133 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
134 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
135 idle = get_idle_time(i);
136 iowait = get_iowait_time(i);
137 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];
142 seq_printf(p, "cpu%d", i);
143 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));
153 seq_putc(p, '\n');
154 }
155 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
156
157 /* sum again ? it could be updated? */
158 for_each_irq_nr(j)
159 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j));
160
161 seq_printf(p,
162 "\nctxt %llu\n"
163 "btime %llu\n"
164 "processes %lu\n"
165 "procs_running %lu\n"
166 "procs_blocked %lu\n",
167 nr_context_switches(),
168 (unsigned long long)boottime.tv_sec,
169 total_forks,
170 nr_running(),
171 nr_iowait());
172
173 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
174
175 for (i = 0; i < NR_SOFTIRQS; i++)
176 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
177 seq_putc(p, '\n');
178
179 return 0;
180}
181
182static int stat_open(struct inode *inode, struct file *file)
183{
184 size_t size = 1024 + 128 * num_online_cpus();
185
186 /* minimum size to display an interrupt count : 2 bytes */
187 size += 2 * nr_irqs;
188 return single_open_size(file, show_stat, NULL, size);
189}
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}
203fs_initcall(proc_stat_init);