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 <linux/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
get_idle_time(int cpu)24 static 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
get_iowait_time(int cpu)34 static 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
get_idle_time(int cpu)46 static u64 get_idle_time(int cpu)
47 {
48 u64 idle, idle_time = -1ULL;
49
50 if (cpu_online(cpu))
51 idle_time = get_cpu_idle_time_us(cpu, NULL);
52
53 if (idle_time == -1ULL)
54 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
55 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
56 else
57 idle = usecs_to_cputime64(idle_time);
58
59 return idle;
60 }
61
get_iowait_time(int cpu)62 static u64 get_iowait_time(int cpu)
63 {
64 u64 iowait, iowait_time = -1ULL;
65
66 if (cpu_online(cpu))
67 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
68
69 if (iowait_time == -1ULL)
70 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
71 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
72 else
73 iowait = usecs_to_cputime64(iowait_time);
74
75 return iowait;
76 }
77
78 #endif
79
show_stat(struct seq_file * p,void * v)80 static int show_stat(struct seq_file *p, void *v)
81 {
82 int i, j;
83 u64 user, nice, system, idle, iowait, irq, softirq, steal;
84 u64 guest, guest_nice;
85 u64 sum = 0;
86 u64 sum_softirq = 0;
87 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
88 struct timespec64 boottime;
89
90 user = nice = system = idle = iowait =
91 irq = softirq = steal = 0;
92 guest = guest_nice = 0;
93 getboottime64(&boottime);
94
95 for_each_possible_cpu(i) {
96 user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
97 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
98 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
99 idle += get_idle_time(i);
100 iowait += get_iowait_time(i);
101 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
102 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
103 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
104 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
105 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
106 sum += kstat_cpu_irqs_sum(i);
107 sum += arch_irq_stat_cpu(i);
108
109 for (j = 0; j < NR_SOFTIRQS; j++) {
110 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
111
112 per_softirq_sums[j] += softirq_stat;
113 sum_softirq += softirq_stat;
114 }
115 }
116 sum += arch_irq_stat();
117
118 seq_put_decimal_ull(p, "cpu ", cputime64_to_clock_t(user));
119 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice));
120 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system));
121 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle));
122 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait));
123 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq));
124 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq));
125 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal));
126 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest));
127 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice));
128 seq_putc(p, '\n');
129
130 for_each_online_cpu(i) {
131 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
132 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
133 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
134 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
135 idle = get_idle_time(i);
136 iowait = get_iowait_time(i);
137 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
138 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
139 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
140 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
141 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
142 seq_printf(p, "cpu%d", i);
143 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(user));
144 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice));
145 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system));
146 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle));
147 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait));
148 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq));
149 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq));
150 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal));
151 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest));
152 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice));
153 seq_putc(p, '\n');
154 }
155 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
156
157 /* sum again ? it could be updated? */
158 for_each_irq_nr(j)
159 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j));
160
161 seq_printf(p,
162 "\nctxt %llu\n"
163 "btime %llu\n"
164 "processes %lu\n"
165 "procs_running %lu\n"
166 "procs_blocked %lu\n",
167 nr_context_switches(),
168 (unsigned long long)boottime.tv_sec,
169 total_forks,
170 nr_running(),
171 nr_iowait());
172
173 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
174
175 for (i = 0; i < NR_SOFTIRQS; i++)
176 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
177 seq_putc(p, '\n');
178
179 return 0;
180 }
181
stat_open(struct inode * inode,struct file * file)182 static int stat_open(struct inode *inode, struct file *file)
183 {
184 size_t size = 1024 + 128 * num_online_cpus();
185
186 /* minimum size to display an interrupt count : 2 bytes */
187 size += 2 * nr_irqs;
188 return single_open_size(file, show_stat, NULL, size);
189 }
190
191 static const struct file_operations proc_stat_operations = {
192 .open = stat_open,
193 .read = seq_read,
194 .llseek = seq_lseek,
195 .release = single_release,
196 };
197
proc_stat_init(void)198 static int __init proc_stat_init(void)
199 {
200 proc_create("stat", 0, NULL, &proc_stat_operations);
201 return 0;
202 }
203 fs_initcall(proc_stat_init);
204