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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/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(struct kernel_cpustat *kcs, int cpu)
27{
28 u64 idle;
29
30 idle = kcs->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(struct kernel_cpustat *kcs, int cpu)
37{
38 u64 iowait;
39
40 iowait = kcs->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(struct kernel_cpustat *kcs, 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 = kcs->cpustat[CPUTIME_IDLE];
58 else
59 idle = idle_usecs * NSEC_PER_USEC;
60
61 return idle;
62}
63
64static u64 get_iowait_time(struct kernel_cpustat *kcs, 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 = kcs->cpustat[CPUTIME_IOWAIT];
74 else
75 iowait = iowait_usecs * NSEC_PER_USEC;
76
77 return iowait;
78}
79
80#endif
81
82static void show_irq_gap(struct seq_file *p, unsigned int gap)
83{
84 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
85
86 while (gap > 0) {
87 unsigned int inc;
88
89 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
90 seq_write(p, zeros, 2 * inc);
91 gap -= inc;
92 }
93}
94
95static void show_all_irqs(struct seq_file *p)
96{
97 unsigned int i, next = 0;
98
99 for_each_active_irq(i) {
100 show_irq_gap(p, i - next);
101 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
102 next = i + 1;
103 }
104 show_irq_gap(p, nr_irqs - next);
105}
106
107static int show_stat(struct seq_file *p, void *v)
108{
109 int i, j;
110 u64 user, nice, system, idle, iowait, irq, softirq, steal;
111 u64 guest, guest_nice;
112 u64 sum = 0;
113 u64 sum_softirq = 0;
114 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
115 struct timespec64 boottime;
116
117 user = nice = system = idle = iowait =
118 irq = softirq = steal = 0;
119 guest = guest_nice = 0;
120 getboottime64(&boottime);
121
122 for_each_possible_cpu(i) {
123 struct kernel_cpustat kcpustat;
124 u64 *cpustat = kcpustat.cpustat;
125
126 kcpustat_cpu_fetch(&kcpustat, i);
127
128 user += cpustat[CPUTIME_USER];
129 nice += cpustat[CPUTIME_NICE];
130 system += cpustat[CPUTIME_SYSTEM];
131 idle += get_idle_time(&kcpustat, i);
132 iowait += get_iowait_time(&kcpustat, i);
133 irq += cpustat[CPUTIME_IRQ];
134 softirq += cpustat[CPUTIME_SOFTIRQ];
135 steal += cpustat[CPUTIME_STEAL];
136 guest += cpustat[CPUTIME_GUEST];
137 guest_nice += cpustat[CPUTIME_GUEST_NICE];
138 sum += kstat_cpu_irqs_sum(i);
139 sum += arch_irq_stat_cpu(i);
140
141 for (j = 0; j < NR_SOFTIRQS; j++) {
142 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
143
144 per_softirq_sums[j] += softirq_stat;
145 sum_softirq += softirq_stat;
146 }
147 }
148 sum += arch_irq_stat();
149
150 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));
151 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
152 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
153 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
154 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
155 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
156 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
157 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
158 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
159 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
160 seq_putc(p, '\n');
161
162 for_each_online_cpu(i) {
163 struct kernel_cpustat kcpustat;
164 u64 *cpustat = kcpustat.cpustat;
165
166 kcpustat_cpu_fetch(&kcpustat, i);
167
168 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
169 user = cpustat[CPUTIME_USER];
170 nice = cpustat[CPUTIME_NICE];
171 system = cpustat[CPUTIME_SYSTEM];
172 idle = get_idle_time(&kcpustat, i);
173 iowait = get_iowait_time(&kcpustat, i);
174 irq = cpustat[CPUTIME_IRQ];
175 softirq = cpustat[CPUTIME_SOFTIRQ];
176 steal = cpustat[CPUTIME_STEAL];
177 guest = cpustat[CPUTIME_GUEST];
178 guest_nice = cpustat[CPUTIME_GUEST_NICE];
179 seq_printf(p, "cpu%d", i);
180 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
181 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
182 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
183 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
184 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
185 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
186 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
187 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
188 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
189 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
190 seq_putc(p, '\n');
191 }
192 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
193
194 show_all_irqs(p);
195
196 seq_printf(p,
197 "\nctxt %llu\n"
198 "btime %llu\n"
199 "processes %lu\n"
200 "procs_running %lu\n"
201 "procs_blocked %lu\n",
202 nr_context_switches(),
203 (unsigned long long)boottime.tv_sec,
204 total_forks,
205 nr_running(),
206 nr_iowait());
207
208 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
209
210 for (i = 0; i < NR_SOFTIRQS; i++)
211 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
212 seq_putc(p, '\n');
213
214 return 0;
215}
216
217static int stat_open(struct inode *inode, struct file *file)
218{
219 unsigned int size = 1024 + 128 * num_online_cpus();
220
221 /* minimum size to display an interrupt count : 2 bytes */
222 size += 2 * nr_irqs;
223 return single_open_size(file, show_stat, NULL, size);
224}
225
226static const struct proc_ops stat_proc_ops = {
227 .proc_flags = PROC_ENTRY_PERMANENT,
228 .proc_open = stat_open,
229 .proc_read = seq_read,
230 .proc_lseek = seq_lseek,
231 .proc_release = single_release,
232};
233
234static int __init proc_stat_init(void)
235{
236 proc_create("stat", 0, NULL, &stat_proc_ops);
237 return 0;
238}
239fs_initcall(proc_stat_init);