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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/time_namespace.h>
14#include <linux/irqnr.h>
15#include <linux/sched/cputime.h>
16#include <linux/tick.h>
17
18#ifndef arch_irq_stat_cpu
19#define arch_irq_stat_cpu(cpu) 0
20#endif
21#ifndef arch_irq_stat
22#define arch_irq_stat() 0
23#endif
24
25u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
26{
27 u64 idle, idle_usecs = -1ULL;
28
29 if (cpu_online(cpu))
30 idle_usecs = get_cpu_idle_time_us(cpu, NULL);
31
32 if (idle_usecs == -1ULL)
33 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
34 idle = kcs->cpustat[CPUTIME_IDLE];
35 else
36 idle = idle_usecs * NSEC_PER_USEC;
37
38 return idle;
39}
40
41static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
42{
43 u64 iowait, iowait_usecs = -1ULL;
44
45 if (cpu_online(cpu))
46 iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
47
48 if (iowait_usecs == -1ULL)
49 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
50 iowait = kcs->cpustat[CPUTIME_IOWAIT];
51 else
52 iowait = iowait_usecs * NSEC_PER_USEC;
53
54 return iowait;
55}
56
57static void show_irq_gap(struct seq_file *p, unsigned int gap)
58{
59 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
60
61 while (gap > 0) {
62 unsigned int inc;
63
64 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
65 seq_write(p, zeros, 2 * inc);
66 gap -= inc;
67 }
68}
69
70static void show_all_irqs(struct seq_file *p)
71{
72 unsigned int i, next = 0;
73
74 for_each_active_irq(i) {
75 show_irq_gap(p, i - next);
76 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
77 next = i + 1;
78 }
79 show_irq_gap(p, nr_irqs - next);
80}
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 /* shift boot timestamp according to the timens offset */
97 timens_sub_boottime(&boottime);
98
99 for_each_possible_cpu(i) {
100 struct kernel_cpustat kcpustat;
101 u64 *cpustat = kcpustat.cpustat;
102
103 kcpustat_cpu_fetch(&kcpustat, i);
104
105 user += cpustat[CPUTIME_USER];
106 nice += cpustat[CPUTIME_NICE];
107 system += cpustat[CPUTIME_SYSTEM];
108 idle += get_idle_time(&kcpustat, i);
109 iowait += get_iowait_time(&kcpustat, i);
110 irq += cpustat[CPUTIME_IRQ];
111 softirq += cpustat[CPUTIME_SOFTIRQ];
112 steal += cpustat[CPUTIME_STEAL];
113 guest += cpustat[CPUTIME_GUEST];
114 guest_nice += cpustat[CPUTIME_GUEST_NICE];
115 sum += kstat_cpu_irqs_sum(i);
116 sum += arch_irq_stat_cpu(i);
117
118 for (j = 0; j < NR_SOFTIRQS; j++) {
119 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
120
121 per_softirq_sums[j] += softirq_stat;
122 sum_softirq += softirq_stat;
123 }
124 }
125 sum += arch_irq_stat();
126
127 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));
128 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
129 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
130 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
131 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
132 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
133 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
134 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
135 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
136 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
137 seq_putc(p, '\n');
138
139 for_each_online_cpu(i) {
140 struct kernel_cpustat kcpustat;
141 u64 *cpustat = kcpustat.cpustat;
142
143 kcpustat_cpu_fetch(&kcpustat, i);
144
145 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
146 user = cpustat[CPUTIME_USER];
147 nice = cpustat[CPUTIME_NICE];
148 system = cpustat[CPUTIME_SYSTEM];
149 idle = get_idle_time(&kcpustat, i);
150 iowait = get_iowait_time(&kcpustat, i);
151 irq = cpustat[CPUTIME_IRQ];
152 softirq = cpustat[CPUTIME_SOFTIRQ];
153 steal = cpustat[CPUTIME_STEAL];
154 guest = cpustat[CPUTIME_GUEST];
155 guest_nice = cpustat[CPUTIME_GUEST_NICE];
156 seq_printf(p, "cpu%d", i);
157 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
158 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
159 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
160 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
161 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
162 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
163 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
164 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
165 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
166 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
167 seq_putc(p, '\n');
168 }
169 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
170
171 show_all_irqs(p);
172
173 seq_printf(p,
174 "\nctxt %llu\n"
175 "btime %llu\n"
176 "processes %lu\n"
177 "procs_running %u\n"
178 "procs_blocked %u\n",
179 nr_context_switches(),
180 (unsigned long long)boottime.tv_sec,
181 total_forks,
182 nr_running(),
183 nr_iowait());
184
185 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
186
187 for (i = 0; i < NR_SOFTIRQS; i++)
188 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
189 seq_putc(p, '\n');
190
191 return 0;
192}
193
194static int stat_open(struct inode *inode, struct file *file)
195{
196 unsigned int size = 1024 + 128 * num_online_cpus();
197
198 /* minimum size to display an interrupt count : 2 bytes */
199 size += 2 * nr_irqs;
200 return single_open_size(file, show_stat, NULL, size);
201}
202
203static const struct proc_ops stat_proc_ops = {
204 .proc_flags = PROC_ENTRY_PERMANENT,
205 .proc_open = stat_open,
206 .proc_read_iter = seq_read_iter,
207 .proc_lseek = seq_lseek,
208 .proc_release = single_release,
209};
210
211static int __init proc_stat_init(void)
212{
213 proc_create("stat", 0, NULL, &stat_proc_ops);
214 return 0;
215}
216fs_initcall(proc_stat_init);
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);