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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 <asm/cputime.h>
13
14#ifndef arch_irq_stat_cpu
15#define arch_irq_stat_cpu(cpu) 0
16#endif
17#ifndef arch_irq_stat
18#define arch_irq_stat() 0
19#endif
20#ifndef arch_idle_time
21#define arch_idle_time(cpu) 0
22#endif
23
24static int show_stat(struct seq_file *p, void *v)
25{
26 int i, j;
27 unsigned long jif;
28 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
29 cputime64_t guest, guest_nice;
30 u64 sum = 0;
31 u64 sum_softirq = 0;
32 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
33 struct timespec boottime;
34
35 user = nice = system = idle = iowait =
36 irq = softirq = steal = cputime64_zero;
37 guest = guest_nice = cputime64_zero;
38 getboottime(&boottime);
39 jif = boottime.tv_sec;
40
41 for_each_possible_cpu(i) {
42 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
43 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
44 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
45 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
46 idle = cputime64_add(idle, arch_idle_time(i));
47 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
48 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
49 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
50 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
51 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
52 guest_nice = cputime64_add(guest_nice,
53 kstat_cpu(i).cpustat.guest_nice);
54 sum += kstat_cpu_irqs_sum(i);
55 sum += arch_irq_stat_cpu(i);
56
57 for (j = 0; j < NR_SOFTIRQS; j++) {
58 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
59
60 per_softirq_sums[j] += softirq_stat;
61 sum_softirq += softirq_stat;
62 }
63 }
64 sum += arch_irq_stat();
65
66 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu "
67 "%llu\n",
68 (unsigned long long)cputime64_to_clock_t(user),
69 (unsigned long long)cputime64_to_clock_t(nice),
70 (unsigned long long)cputime64_to_clock_t(system),
71 (unsigned long long)cputime64_to_clock_t(idle),
72 (unsigned long long)cputime64_to_clock_t(iowait),
73 (unsigned long long)cputime64_to_clock_t(irq),
74 (unsigned long long)cputime64_to_clock_t(softirq),
75 (unsigned long long)cputime64_to_clock_t(steal),
76 (unsigned long long)cputime64_to_clock_t(guest),
77 (unsigned long long)cputime64_to_clock_t(guest_nice));
78 for_each_online_cpu(i) {
79
80 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
81 user = kstat_cpu(i).cpustat.user;
82 nice = kstat_cpu(i).cpustat.nice;
83 system = kstat_cpu(i).cpustat.system;
84 idle = kstat_cpu(i).cpustat.idle;
85 idle = cputime64_add(idle, arch_idle_time(i));
86 iowait = kstat_cpu(i).cpustat.iowait;
87 irq = kstat_cpu(i).cpustat.irq;
88 softirq = kstat_cpu(i).cpustat.softirq;
89 steal = kstat_cpu(i).cpustat.steal;
90 guest = kstat_cpu(i).cpustat.guest;
91 guest_nice = kstat_cpu(i).cpustat.guest_nice;
92 seq_printf(p,
93 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
94 "%llu\n",
95 i,
96 (unsigned long long)cputime64_to_clock_t(user),
97 (unsigned long long)cputime64_to_clock_t(nice),
98 (unsigned long long)cputime64_to_clock_t(system),
99 (unsigned long long)cputime64_to_clock_t(idle),
100 (unsigned long long)cputime64_to_clock_t(iowait),
101 (unsigned long long)cputime64_to_clock_t(irq),
102 (unsigned long long)cputime64_to_clock_t(softirq),
103 (unsigned long long)cputime64_to_clock_t(steal),
104 (unsigned long long)cputime64_to_clock_t(guest),
105 (unsigned long long)cputime64_to_clock_t(guest_nice));
106 }
107 seq_printf(p, "intr %llu", (unsigned long long)sum);
108
109 /* sum again ? it could be updated? */
110 for_each_irq_nr(j)
111 seq_printf(p, " %u", kstat_irqs(j));
112
113 seq_printf(p,
114 "\nctxt %llu\n"
115 "btime %lu\n"
116 "processes %lu\n"
117 "procs_running %lu\n"
118 "procs_blocked %lu\n",
119 nr_context_switches(),
120 (unsigned long)jif,
121 total_forks,
122 nr_running(),
123 nr_iowait());
124
125 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
126
127 for (i = 0; i < NR_SOFTIRQS; i++)
128 seq_printf(p, " %u", per_softirq_sums[i]);
129 seq_putc(p, '\n');
130
131 return 0;
132}
133
134static int stat_open(struct inode *inode, struct file *file)
135{
136 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
137 char *buf;
138 struct seq_file *m;
139 int res;
140
141 /* don't ask for more than the kmalloc() max size */
142 if (size > KMALLOC_MAX_SIZE)
143 size = KMALLOC_MAX_SIZE;
144 buf = kmalloc(size, GFP_KERNEL);
145 if (!buf)
146 return -ENOMEM;
147
148 res = single_open(file, show_stat, NULL);
149 if (!res) {
150 m = file->private_data;
151 m->buf = buf;
152 m->size = size;
153 } else
154 kfree(buf);
155 return res;
156}
157
158static const struct file_operations proc_stat_operations = {
159 .open = stat_open,
160 .read = seq_read,
161 .llseek = seq_lseek,
162 .release = single_release,
163};
164
165static int __init proc_stat_init(void)
166{
167 proc_create("stat", 0, NULL, &proc_stat_operations);
168 return 0;
169}
170module_init(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/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, irq_get_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 * irq_get_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);