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df8106db AD |
1 | #include <linux/cpumask.h> |
2 | #include <linux/fs.h> | |
df8106db AD |
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> | |
26ddd8d5 | 11 | #include <linux/irqnr.h> |
df8106db | 12 | #include <asm/cputime.h> |
a25cac51 | 13 | #include <linux/tick.h> |
df8106db AD |
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 | |
e1c80530 MS |
21 | #ifndef arch_idle_time |
22 | #define arch_idle_time(cpu) 0 | |
23 | #endif | |
df8106db | 24 | |
a25cac51 MH |
25 | static cputime64_t get_idle_time(int cpu) |
26 | { | |
27 | u64 idle_time = get_cpu_idle_time_us(cpu, NULL); | |
28 | cputime64_t idle; | |
29 | ||
30 | if (idle_time == -1ULL) { | |
31 | /* !NO_HZ so we can rely on cpustat.idle */ | |
32 | idle = kstat_cpu(cpu).cpustat.idle; | |
64861634 | 33 | idle += arch_idle_time(cpu); |
a25cac51 | 34 | } else |
2a95ea6c | 35 | idle = nsecs_to_jiffies64(1000 * idle_time); |
a25cac51 MH |
36 | |
37 | return idle; | |
38 | } | |
39 | ||
40 | static cputime64_t get_iowait_time(int cpu) | |
41 | { | |
42 | u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL); | |
43 | cputime64_t iowait; | |
44 | ||
45 | if (iowait_time == -1ULL) | |
46 | /* !NO_HZ so we can rely on cpustat.iowait */ | |
47 | iowait = kstat_cpu(cpu).cpustat.iowait; | |
48 | else | |
2a95ea6c | 49 | iowait = nsecs_to_jiffies64(1000 * iowait_time); |
a25cac51 MH |
50 | |
51 | return iowait; | |
52 | } | |
53 | ||
df8106db AD |
54 | static int show_stat(struct seq_file *p, void *v) |
55 | { | |
56 | int i, j; | |
57 | unsigned long jif; | |
58 | cputime64_t user, nice, system, idle, iowait, irq, softirq, steal; | |
ce0e7b28 | 59 | cputime64_t guest, guest_nice; |
df8106db | 60 | u64 sum = 0; |
d3d64df2 KK |
61 | u64 sum_softirq = 0; |
62 | unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; | |
df8106db | 63 | struct timespec boottime; |
df8106db AD |
64 | |
65 | user = nice = system = idle = iowait = | |
64861634 MS |
66 | irq = softirq = steal = 0; |
67 | guest = guest_nice = 0; | |
df8106db AD |
68 | getboottime(&boottime); |
69 | jif = boottime.tv_sec; | |
70 | ||
71 | for_each_possible_cpu(i) { | |
64861634 MS |
72 | user += kstat_cpu(i).cpustat.user; |
73 | nice += kstat_cpu(i).cpustat.nice; | |
74 | system += kstat_cpu(i).cpustat.system; | |
75 | idle += get_idle_time(i); | |
76 | iowait += get_iowait_time(i); | |
77 | irq += kstat_cpu(i).cpustat.irq; | |
78 | softirq += kstat_cpu(i).cpustat.softirq; | |
79 | steal += kstat_cpu(i).cpustat.steal; | |
80 | guest += kstat_cpu(i).cpustat.guest; | |
81 | guest_nice += kstat_cpu(i).cpustat.guest_nice; | |
f2c66cd8 | 82 | sum += kstat_cpu_irqs_sum(i); |
df8106db | 83 | sum += arch_irq_stat_cpu(i); |
d3d64df2 KK |
84 | |
85 | for (j = 0; j < NR_SOFTIRQS; j++) { | |
86 | unsigned int softirq_stat = kstat_softirqs_cpu(j, i); | |
87 | ||
88 | per_softirq_sums[j] += softirq_stat; | |
89 | sum_softirq += softirq_stat; | |
90 | } | |
df8106db AD |
91 | } |
92 | sum += arch_irq_stat(); | |
93 | ||
ce0e7b28 RO |
94 | seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu " |
95 | "%llu\n", | |
df8106db AD |
96 | (unsigned long long)cputime64_to_clock_t(user), |
97 | (unsigned long long)cputime64_to_clock_t(nice), | |
98 | (unsigned long long)cputime64_to_clock_t(system), | |
99 | (unsigned long long)cputime64_to_clock_t(idle), | |
100 | (unsigned long long)cputime64_to_clock_t(iowait), | |
101 | (unsigned long long)cputime64_to_clock_t(irq), | |
102 | (unsigned long long)cputime64_to_clock_t(softirq), | |
103 | (unsigned long long)cputime64_to_clock_t(steal), | |
ce0e7b28 RO |
104 | (unsigned long long)cputime64_to_clock_t(guest), |
105 | (unsigned long long)cputime64_to_clock_t(guest_nice)); | |
df8106db | 106 | for_each_online_cpu(i) { |
df8106db AD |
107 | /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ |
108 | user = kstat_cpu(i).cpustat.user; | |
109 | nice = kstat_cpu(i).cpustat.nice; | |
110 | system = kstat_cpu(i).cpustat.system; | |
a25cac51 MH |
111 | idle = get_idle_time(i); |
112 | iowait = get_iowait_time(i); | |
df8106db AD |
113 | irq = kstat_cpu(i).cpustat.irq; |
114 | softirq = kstat_cpu(i).cpustat.softirq; | |
115 | steal = kstat_cpu(i).cpustat.steal; | |
116 | guest = kstat_cpu(i).cpustat.guest; | |
ce0e7b28 | 117 | guest_nice = kstat_cpu(i).cpustat.guest_nice; |
df8106db | 118 | seq_printf(p, |
ce0e7b28 RO |
119 | "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu " |
120 | "%llu\n", | |
df8106db AD |
121 | i, |
122 | (unsigned long long)cputime64_to_clock_t(user), | |
123 | (unsigned long long)cputime64_to_clock_t(nice), | |
124 | (unsigned long long)cputime64_to_clock_t(system), | |
125 | (unsigned long long)cputime64_to_clock_t(idle), | |
126 | (unsigned long long)cputime64_to_clock_t(iowait), | |
127 | (unsigned long long)cputime64_to_clock_t(irq), | |
128 | (unsigned long long)cputime64_to_clock_t(softirq), | |
129 | (unsigned long long)cputime64_to_clock_t(steal), | |
ce0e7b28 RO |
130 | (unsigned long long)cputime64_to_clock_t(guest), |
131 | (unsigned long long)cputime64_to_clock_t(guest_nice)); | |
df8106db AD |
132 | } |
133 | seq_printf(p, "intr %llu", (unsigned long long)sum); | |
134 | ||
135 | /* sum again ? it could be updated? */ | |
478735e3 KH |
136 | for_each_irq_nr(j) |
137 | seq_printf(p, " %u", kstat_irqs(j)); | |
df8106db AD |
138 | |
139 | seq_printf(p, | |
140 | "\nctxt %llu\n" | |
141 | "btime %lu\n" | |
142 | "processes %lu\n" | |
143 | "procs_running %lu\n" | |
144 | "procs_blocked %lu\n", | |
145 | nr_context_switches(), | |
146 | (unsigned long)jif, | |
147 | total_forks, | |
148 | nr_running(), | |
149 | nr_iowait()); | |
150 | ||
d3d64df2 KK |
151 | seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq); |
152 | ||
153 | for (i = 0; i < NR_SOFTIRQS; i++) | |
154 | seq_printf(p, " %u", per_softirq_sums[i]); | |
9d6de12f | 155 | seq_putc(p, '\n'); |
d3d64df2 | 156 | |
df8106db AD |
157 | return 0; |
158 | } | |
159 | ||
160 | static int stat_open(struct inode *inode, struct file *file) | |
161 | { | |
162 | unsigned size = 4096 * (1 + num_possible_cpus() / 32); | |
163 | char *buf; | |
164 | struct seq_file *m; | |
165 | int res; | |
166 | ||
a4dbf0ec YL |
167 | /* don't ask for more than the kmalloc() max size */ |
168 | if (size > KMALLOC_MAX_SIZE) | |
169 | size = KMALLOC_MAX_SIZE; | |
df8106db AD |
170 | buf = kmalloc(size, GFP_KERNEL); |
171 | if (!buf) | |
172 | return -ENOMEM; | |
173 | ||
174 | res = single_open(file, show_stat, NULL); | |
175 | if (!res) { | |
176 | m = file->private_data; | |
177 | m->buf = buf; | |
178 | m->size = size; | |
179 | } else | |
180 | kfree(buf); | |
181 | return res; | |
182 | } | |
183 | ||
184 | static const struct file_operations proc_stat_operations = { | |
185 | .open = stat_open, | |
186 | .read = seq_read, | |
187 | .llseek = seq_lseek, | |
188 | .release = single_release, | |
189 | }; | |
190 | ||
191 | static int __init proc_stat_init(void) | |
192 | { | |
193 | proc_create("stat", 0, NULL, &proc_stat_operations); | |
194 | return 0; | |
195 | } | |
196 | module_init(proc_stat_init); |