1 #include <linux/cpumask.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>
15 #ifndef arch_irq_stat_cpu
16 #define arch_irq_stat_cpu(cpu) 0
19 #define arch_irq_stat() 0
24 static cputime64_t get_idle_time(int cpu)
28 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
29 if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
30 idle += arch_idle_time(cpu);
34 static cputime64_t get_iowait_time(int cpu)
38 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
39 if (cpu_online(cpu) && nr_iowait_cpu(cpu))
40 iowait += arch_idle_time(cpu);
46 static u64 get_idle_time(int cpu)
48 u64 idle, idle_time = -1ULL;
51 idle_time = get_cpu_idle_time_us(cpu, NULL);
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];
57 idle = usecs_to_cputime64(idle_time);
62 static u64 get_iowait_time(int cpu)
64 u64 iowait, iowait_time = -1ULL;
67 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
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];
73 iowait = usecs_to_cputime64(iowait_time);
80 static int show_stat(struct seq_file *p, void *v)
84 u64 user, nice, system, idle, iowait, irq, softirq, steal;
85 u64 guest, guest_nice;
88 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
89 struct timespec boottime;
91 user = nice = system = idle = iowait =
92 irq = softirq = steal = 0;
93 guest = guest_nice = 0;
94 getboottime(&boottime);
95 jif = boottime.tv_sec;
97 for_each_possible_cpu(i) {
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];
108 sum += kstat_cpu_irqs_sum(i);
109 sum += arch_irq_stat_cpu(i);
111 for (j = 0; j < NR_SOFTIRQS; j++) {
112 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
114 per_softirq_sums[j] += softirq_stat;
115 sum_softirq += softirq_stat;
118 sum += arch_irq_stat();
121 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
122 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
123 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
124 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
125 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
126 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
127 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
128 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
129 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
130 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
133 for_each_online_cpu(i) {
134 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
135 user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
136 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
137 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
138 idle = get_idle_time(i);
139 iowait = get_iowait_time(i);
140 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
141 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
142 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
143 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
144 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
145 seq_printf(p, "cpu%d", i);
146 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
147 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
148 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
149 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
150 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
151 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
152 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
153 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
154 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
155 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
158 seq_printf(p, "intr %llu", (unsigned long long)sum);
160 /* sum again ? it could be updated? */
162 seq_put_decimal_ull(p, ' ', kstat_irqs_usr(j));
168 "procs_running %lu\n"
169 "procs_blocked %lu\n",
170 nr_context_switches(),
176 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
178 for (i = 0; i < NR_SOFTIRQS; i++)
179 seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
185 static int stat_open(struct inode *inode, struct file *file)
187 size_t size = 1024 + 128 * num_online_cpus();
189 /* minimum size to display an interrupt count : 2 bytes */
191 return single_open_size(file, show_stat, NULL, size);
194 static const struct file_operations proc_stat_operations = {
198 .release = single_release,
201 static int __init proc_stat_init(void)
203 proc_create("stat", 0, NULL, &proc_stat_operations);
206 fs_initcall(proc_stat_init);