Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#include <linux/tick.h>
14
15#ifndef arch_irq_stat_cpu
16#define arch_irq_stat_cpu(cpu) 0
17#endif
18#ifndef arch_irq_stat
19#define arch_irq_stat() 0
20#endif
21
22#ifdef arch_idle_time
23
24static cputime64_t get_idle_time(int cpu)
25{
26 cputime64_t idle;
27
28 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
29 if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
30 idle += arch_idle_time(cpu);
31 return idle;
32}
33
34static cputime64_t get_iowait_time(int cpu)
35{
36 cputime64_t iowait;
37
38 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
39 if (cpu_online(cpu) && nr_iowait_cpu(cpu))
40 iowait += arch_idle_time(cpu);
41 return iowait;
42}
43
44#else
45
46static u64 get_idle_time(int cpu)
47{
48 u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
49
50 if (idle_time == -1ULL)
51 /* !NO_HZ so we can rely on cpustat.idle */
52 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
53 else
54 idle = usecs_to_cputime64(idle_time);
55
56 return idle;
57}
58
59static u64 get_iowait_time(int cpu)
60{
61 u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
62
63 if (iowait_time == -1ULL)
64 /* !NO_HZ so we can rely on cpustat.iowait */
65 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
66 else
67 iowait = usecs_to_cputime64(iowait_time);
68
69 return iowait;
70}
71
72#endif
73
74static int show_stat(struct seq_file *p, void *v)
75{
76 int i, j;
77 unsigned long jif;
78 u64 user, nice, system, idle, iowait, irq, softirq, steal;
79 u64 guest, guest_nice;
80 u64 sum = 0;
81 u64 sum_softirq = 0;
82 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
83 struct timespec boottime;
84
85 user = nice = system = idle = iowait =
86 irq = softirq = steal = 0;
87 guest = guest_nice = 0;
88 getboottime(&boottime);
89 jif = boottime.tv_sec;
90
91 for_each_possible_cpu(i) {
92 user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
93 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
94 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
95 idle += get_idle_time(i);
96 iowait += get_iowait_time(i);
97 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
98 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
99 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
100 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
101 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
102 sum += kstat_cpu_irqs_sum(i);
103 sum += arch_irq_stat_cpu(i);
104
105 for (j = 0; j < NR_SOFTIRQS; j++) {
106 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
107
108 per_softirq_sums[j] += softirq_stat;
109 sum_softirq += softirq_stat;
110 }
111 }
112 sum += arch_irq_stat();
113
114 seq_puts(p, "cpu ");
115 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
116 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
117 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
118 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
119 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
120 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
121 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
122 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
123 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
124 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
125 seq_putc(p, '\n');
126
127 for_each_online_cpu(i) {
128 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
129 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
130 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
131 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
132 idle = get_idle_time(i);
133 iowait = get_iowait_time(i);
134 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
135 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
136 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
137 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
138 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
139 seq_printf(p, "cpu%d", i);
140 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
141 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
142 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
143 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
144 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
145 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
146 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
147 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
148 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
149 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
150 seq_putc(p, '\n');
151 }
152 seq_printf(p, "intr %llu", (unsigned long long)sum);
153
154 /* sum again ? it could be updated? */
155 for_each_irq_nr(j)
156 seq_put_decimal_ull(p, ' ', kstat_irqs(j));
157
158 seq_printf(p,
159 "\nctxt %llu\n"
160 "btime %lu\n"
161 "processes %lu\n"
162 "procs_running %lu\n"
163 "procs_blocked %lu\n",
164 nr_context_switches(),
165 (unsigned long)jif,
166 total_forks,
167 nr_running(),
168 nr_iowait());
169
170 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
171
172 for (i = 0; i < NR_SOFTIRQS; i++)
173 seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
174 seq_putc(p, '\n');
175
176 return 0;
177}
178
179static int stat_open(struct inode *inode, struct file *file)
180{
181 unsigned size = 1024 + 128 * num_possible_cpus();
182 char *buf;
183 struct seq_file *m;
184 int res;
185
186 /* minimum size to display an interrupt count : 2 bytes */
187 size += 2 * nr_irqs;
188
189 /* don't ask for more than the kmalloc() max size */
190 if (size > KMALLOC_MAX_SIZE)
191 size = KMALLOC_MAX_SIZE;
192 buf = kmalloc(size, GFP_KERNEL);
193 if (!buf)
194 return -ENOMEM;
195
196 res = single_open(file, show_stat, NULL);
197 if (!res) {
198 m = file->private_data;
199 m->buf = buf;
200 m->size = ksize(buf);
201 } else
202 kfree(buf);
203 return res;
204}
205
206static const struct file_operations proc_stat_operations = {
207 .open = stat_open,
208 .read = seq_read,
209 .llseek = seq_lseek,
210 .release = single_release,
211};
212
213static int __init proc_stat_init(void)
214{
215 proc_create("stat", 0, NULL, &proc_stat_operations);
216 return 0;
217}
218module_init(proc_stat_init);