Line data Source code
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 :
25 : #ifdef arch_idle_time
26 :
27 : static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
28 : {
29 : u64 idle;
30 :
31 : idle = kcs->cpustat[CPUTIME_IDLE];
32 : if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
33 : idle += arch_idle_time(cpu);
34 : return idle;
35 : }
36 :
37 : static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
38 : {
39 : u64 iowait;
40 :
41 : iowait = kcs->cpustat[CPUTIME_IOWAIT];
42 : if (cpu_online(cpu) && nr_iowait_cpu(cpu))
43 : iowait += arch_idle_time(cpu);
44 : return iowait;
45 : }
46 :
47 : #else
48 :
49 0 : static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
50 : {
51 0 : u64 idle, idle_usecs = -1ULL;
52 :
53 0 : if (cpu_online(cpu))
54 0 : idle_usecs = get_cpu_idle_time_us(cpu, NULL);
55 :
56 0 : if (idle_usecs == -1ULL)
57 : /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
58 0 : idle = kcs->cpustat[CPUTIME_IDLE];
59 : else
60 0 : idle = idle_usecs * NSEC_PER_USEC;
61 :
62 0 : return idle;
63 : }
64 :
65 0 : static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
66 : {
67 0 : u64 iowait, iowait_usecs = -1ULL;
68 :
69 0 : if (cpu_online(cpu))
70 0 : iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
71 :
72 0 : if (iowait_usecs == -1ULL)
73 : /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
74 0 : iowait = kcs->cpustat[CPUTIME_IOWAIT];
75 : else
76 0 : iowait = iowait_usecs * NSEC_PER_USEC;
77 :
78 0 : return iowait;
79 : }
80 :
81 : #endif
82 :
83 0 : static void show_irq_gap(struct seq_file *p, unsigned int gap)
84 : {
85 0 : static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
86 :
87 0 : while (gap > 0) {
88 0 : unsigned int inc;
89 :
90 0 : inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
91 0 : seq_write(p, zeros, 2 * inc);
92 0 : gap -= inc;
93 : }
94 0 : }
95 :
96 0 : static void show_all_irqs(struct seq_file *p)
97 : {
98 0 : unsigned int i, next = 0;
99 :
100 0 : for_each_active_irq(i) {
101 0 : show_irq_gap(p, i - next);
102 0 : seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
103 0 : next = i + 1;
104 : }
105 0 : show_irq_gap(p, nr_irqs - next);
106 0 : }
107 :
108 0 : static int show_stat(struct seq_file *p, void *v)
109 : {
110 0 : int i, j;
111 0 : u64 user, nice, system, idle, iowait, irq, softirq, steal;
112 0 : u64 guest, guest_nice;
113 0 : u64 sum = 0;
114 0 : u64 sum_softirq = 0;
115 0 : unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
116 0 : struct timespec64 boottime;
117 :
118 0 : user = nice = system = idle = iowait =
119 0 : irq = softirq = steal = 0;
120 0 : guest = guest_nice = 0;
121 0 : getboottime64(&boottime);
122 : /* shift boot timestamp according to the timens offset */
123 0 : timens_sub_boottime(&boottime);
124 :
125 0 : for_each_possible_cpu(i) {
126 0 : struct kernel_cpustat kcpustat;
127 0 : u64 *cpustat = kcpustat.cpustat;
128 :
129 0 : kcpustat_cpu_fetch(&kcpustat, i);
130 :
131 0 : user += cpustat[CPUTIME_USER];
132 0 : nice += cpustat[CPUTIME_NICE];
133 0 : system += cpustat[CPUTIME_SYSTEM];
134 0 : idle += get_idle_time(&kcpustat, i);
135 0 : iowait += get_iowait_time(&kcpustat, i);
136 0 : irq += cpustat[CPUTIME_IRQ];
137 0 : softirq += cpustat[CPUTIME_SOFTIRQ];
138 0 : steal += cpustat[CPUTIME_STEAL];
139 0 : guest += cpustat[CPUTIME_GUEST];
140 0 : guest_nice += cpustat[CPUTIME_GUEST_NICE];
141 0 : sum += kstat_cpu_irqs_sum(i);
142 0 : sum += arch_irq_stat_cpu(i);
143 :
144 0 : for (j = 0; j < NR_SOFTIRQS; j++) {
145 0 : unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
146 :
147 0 : per_softirq_sums[j] += softirq_stat;
148 0 : sum_softirq += softirq_stat;
149 : }
150 : }
151 0 : sum += arch_irq_stat();
152 :
153 0 : seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));
154 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
155 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
156 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
157 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
158 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
159 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
160 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
161 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
162 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
163 0 : seq_putc(p, '\n');
164 :
165 0 : for_each_online_cpu(i) {
166 0 : struct kernel_cpustat kcpustat;
167 0 : u64 *cpustat = kcpustat.cpustat;
168 :
169 0 : kcpustat_cpu_fetch(&kcpustat, i);
170 :
171 : /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
172 0 : user = cpustat[CPUTIME_USER];
173 0 : nice = cpustat[CPUTIME_NICE];
174 0 : system = cpustat[CPUTIME_SYSTEM];
175 0 : idle = get_idle_time(&kcpustat, i);
176 0 : iowait = get_iowait_time(&kcpustat, i);
177 0 : irq = cpustat[CPUTIME_IRQ];
178 0 : softirq = cpustat[CPUTIME_SOFTIRQ];
179 0 : steal = cpustat[CPUTIME_STEAL];
180 0 : guest = cpustat[CPUTIME_GUEST];
181 0 : guest_nice = cpustat[CPUTIME_GUEST_NICE];
182 0 : seq_printf(p, "cpu%d", i);
183 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
184 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
185 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
186 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
187 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
188 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
189 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
190 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
191 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
192 0 : seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
193 0 : seq_putc(p, '\n');
194 : }
195 0 : seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
196 :
197 0 : show_all_irqs(p);
198 :
199 0 : seq_printf(p,
200 : "\nctxt %llu\n"
201 : "btime %llu\n"
202 : "processes %lu\n"
203 : "procs_running %lu\n"
204 : "procs_blocked %lu\n",
205 : nr_context_switches(),
206 0 : (unsigned long long)boottime.tv_sec,
207 : total_forks,
208 : nr_running(),
209 : nr_iowait());
210 :
211 0 : seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
212 :
213 0 : for (i = 0; i < NR_SOFTIRQS; i++)
214 0 : seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
215 0 : seq_putc(p, '\n');
216 :
217 0 : return 0;
218 : }
219 :
220 0 : static int stat_open(struct inode *inode, struct file *file)
221 : {
222 0 : unsigned int size = 1024 + 128 * num_online_cpus();
223 :
224 : /* minimum size to display an interrupt count : 2 bytes */
225 0 : size += 2 * nr_irqs;
226 0 : return single_open_size(file, show_stat, NULL, size);
227 : }
228 :
229 : static const struct proc_ops stat_proc_ops = {
230 : .proc_flags = PROC_ENTRY_PERMANENT,
231 : .proc_open = stat_open,
232 : .proc_read_iter = seq_read_iter,
233 : .proc_lseek = seq_lseek,
234 : .proc_release = single_release,
235 : };
236 :
237 1 : static int __init proc_stat_init(void)
238 : {
239 1 : proc_create("stat", 0, NULL, &stat_proc_ops);
240 1 : return 0;
241 : }
242 : fs_initcall(proc_stat_init);
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