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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
df8106db AD |
2 | #include <linux/cpumask.h> |
3 | #include <linux/fs.h> | |
df8106db AD |
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> | |
03441a34 | 9 | #include <linux/sched/stat.h> |
df8106db AD |
10 | #include <linux/seq_file.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/time.h> | |
26ddd8d5 | 13 | #include <linux/irqnr.h> |
32ef5517 | 14 | #include <linux/sched/cputime.h> |
a25cac51 | 15 | #include <linux/tick.h> |
df8106db AD |
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 | |
cb85a6ed MS |
23 | |
24 | #ifdef arch_idle_time | |
25 | ||
7fb1327e | 26 | static u64 get_idle_time(int cpu) |
cb85a6ed | 27 | { |
7fb1327e | 28 | u64 idle; |
cb85a6ed MS |
29 | |
30 | idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; | |
31 | if (cpu_online(cpu) && !nr_iowait_cpu(cpu)) | |
42b425b3 | 32 | idle += arch_idle_time(cpu); |
cb85a6ed MS |
33 | return idle; |
34 | } | |
35 | ||
7fb1327e | 36 | static u64 get_iowait_time(int cpu) |
cb85a6ed | 37 | { |
7fb1327e | 38 | u64 iowait; |
cb85a6ed MS |
39 | |
40 | iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; | |
41 | if (cpu_online(cpu) && nr_iowait_cpu(cpu)) | |
42b425b3 | 42 | iowait += arch_idle_time(cpu); |
cb85a6ed MS |
43 | return iowait; |
44 | } | |
45 | ||
46 | #else | |
df8106db | 47 | |
3292beb3 | 48 | static u64 get_idle_time(int cpu) |
a25cac51 | 49 | { |
7fb1327e | 50 | u64 idle, idle_usecs = -1ULL; |
7386cdbf MH |
51 | |
52 | if (cpu_online(cpu)) | |
7fb1327e | 53 | idle_usecs = get_cpu_idle_time_us(cpu, NULL); |
a25cac51 | 54 | |
7fb1327e | 55 | if (idle_usecs == -1ULL) |
7386cdbf | 56 | /* !NO_HZ or cpu offline so we can rely on cpustat.idle */ |
3292beb3 | 57 | idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; |
cb85a6ed | 58 | else |
7fb1327e | 59 | idle = idle_usecs * NSEC_PER_USEC; |
a25cac51 MH |
60 | |
61 | return idle; | |
62 | } | |
63 | ||
3292beb3 | 64 | static u64 get_iowait_time(int cpu) |
a25cac51 | 65 | { |
7fb1327e | 66 | u64 iowait, iowait_usecs = -1ULL; |
7386cdbf MH |
67 | |
68 | if (cpu_online(cpu)) | |
7fb1327e | 69 | iowait_usecs = get_cpu_iowait_time_us(cpu, NULL); |
a25cac51 | 70 | |
7fb1327e | 71 | if (iowait_usecs == -1ULL) |
7386cdbf | 72 | /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */ |
3292beb3 | 73 | iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; |
a25cac51 | 74 | else |
7fb1327e | 75 | iowait = iowait_usecs * NSEC_PER_USEC; |
a25cac51 MH |
76 | |
77 | return iowait; | |
78 | } | |
79 | ||
cb85a6ed MS |
80 | #endif |
81 | ||
df8106db AD |
82 | static int show_stat(struct seq_file *p, void *v) |
83 | { | |
84 | int i, j; | |
3292beb3 GC |
85 | u64 user, nice, system, idle, iowait, irq, softirq, steal; |
86 | u64 guest, guest_nice; | |
df8106db | 87 | u64 sum = 0; |
d3d64df2 KK |
88 | u64 sum_softirq = 0; |
89 | unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; | |
519ded5a | 90 | struct timespec64 boottime; |
df8106db AD |
91 | |
92 | user = nice = system = idle = iowait = | |
3292beb3 GC |
93 | irq = softirq = steal = 0; |
94 | guest = guest_nice = 0; | |
519ded5a | 95 | getboottime64(&boottime); |
df8106db AD |
96 | |
97 | for_each_possible_cpu(i) { | |
3292beb3 GC |
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]; | |
f7e6746e RK |
108 | sum += kstat_cpu_irqs_sum(i); |
109 | sum += arch_irq_stat_cpu(i); | |
d3d64df2 KK |
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 | } | |
df8106db AD |
117 | } |
118 | sum += arch_irq_stat(); | |
119 | ||
7fb1327e FW |
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)); | |
1ac101a5 KH |
130 | seq_putc(p, '\n'); |
131 | ||
df8106db | 132 | for_each_online_cpu(i) { |
df8106db | 133 | /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ |
3292beb3 GC |
134 | user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; |
135 | nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; | |
136 | system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; | |
a25cac51 MH |
137 | idle = get_idle_time(i); |
138 | iowait = get_iowait_time(i); | |
3292beb3 GC |
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]; | |
1ac101a5 | 144 | seq_printf(p, "cpu%d", i); |
7fb1327e FW |
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)); | |
1ac101a5 | 155 | seq_putc(p, '\n'); |
df8106db | 156 | } |
75ba1d07 | 157 | seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); |
df8106db AD |
158 | |
159 | /* sum again ? it could be updated? */ | |
478735e3 | 160 | for_each_irq_nr(j) |
75ba1d07 | 161 | seq_put_decimal_ull(p, " ", kstat_irqs_usr(j)); |
df8106db AD |
162 | |
163 | seq_printf(p, | |
164 | "\nctxt %llu\n" | |
519ded5a | 165 | "btime %llu\n" |
df8106db AD |
166 | "processes %lu\n" |
167 | "procs_running %lu\n" | |
168 | "procs_blocked %lu\n", | |
169 | nr_context_switches(), | |
519ded5a | 170 | (unsigned long long)boottime.tv_sec, |
df8106db AD |
171 | total_forks, |
172 | nr_running(), | |
173 | nr_iowait()); | |
174 | ||
75ba1d07 | 175 | seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); |
d3d64df2 KK |
176 | |
177 | for (i = 0; i < NR_SOFTIRQS; i++) | |
75ba1d07 | 178 | seq_put_decimal_ull(p, " ", per_softirq_sums[i]); |
9d6de12f | 179 | seq_putc(p, '\n'); |
d3d64df2 | 180 | |
df8106db AD |
181 | return 0; |
182 | } | |
183 | ||
184 | static int stat_open(struct inode *inode, struct file *file) | |
185 | { | |
9a27e97a | 186 | unsigned int size = 1024 + 128 * num_online_cpus(); |
df8106db | 187 | |
59a32e2c ED |
188 | /* minimum size to display an interrupt count : 2 bytes */ |
189 | size += 2 * nr_irqs; | |
f74373a5 | 190 | return single_open_size(file, show_stat, NULL, size); |
df8106db AD |
191 | } |
192 | ||
193 | static 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 | ||
200 | static int __init proc_stat_init(void) | |
201 | { | |
202 | proc_create("stat", 0, NULL, &proc_stat_operations); | |
203 | return 0; | |
204 | } | |
abaf3787 | 205 | fs_initcall(proc_stat_init); |