9758b654a1bcffe27c414ef322f34cd6a8658c33
[~shefty/rdma-dev.git] / fs / proc / stat.c
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
14 #ifndef arch_irq_stat_cpu
15 #define arch_irq_stat_cpu(cpu) 0
16 #endif
17 #ifndef arch_irq_stat
18 #define arch_irq_stat() 0
19 #endif
20 #ifndef arch_idle_time
21 #define arch_idle_time(cpu) 0
22 #endif
23
24 static int show_stat(struct seq_file *p, void *v)
25 {
26         int i, j;
27         unsigned long jif;
28         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
29         cputime64_t guest, guest_nice;
30         u64 sum = 0;
31         u64 sum_softirq = 0;
32         unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
33         struct timespec boottime;
34
35         user = nice = system = idle = iowait =
36                 irq = softirq = steal = cputime64_zero;
37         guest = guest_nice = cputime64_zero;
38         getboottime(&boottime);
39         jif = boottime.tv_sec;
40
41         for_each_possible_cpu(i) {
42                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
43                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
44                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
45                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
46                 idle = cputime64_add(idle, arch_idle_time(i));
47                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
48                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
49                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
50                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
51                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
52                 guest_nice = cputime64_add(guest_nice,
53                         kstat_cpu(i).cpustat.guest_nice);
54                 sum += kstat_cpu_irqs_sum(i);
55                 sum += arch_irq_stat_cpu(i);
56
57                 for (j = 0; j < NR_SOFTIRQS; j++) {
58                         unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
59
60                         per_softirq_sums[j] += softirq_stat;
61                         sum_softirq += softirq_stat;
62                 }
63         }
64         sum += arch_irq_stat();
65
66         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu "
67                 "%llu\n",
68                 (unsigned long long)cputime64_to_clock_t(user),
69                 (unsigned long long)cputime64_to_clock_t(nice),
70                 (unsigned long long)cputime64_to_clock_t(system),
71                 (unsigned long long)cputime64_to_clock_t(idle),
72                 (unsigned long long)cputime64_to_clock_t(iowait),
73                 (unsigned long long)cputime64_to_clock_t(irq),
74                 (unsigned long long)cputime64_to_clock_t(softirq),
75                 (unsigned long long)cputime64_to_clock_t(steal),
76                 (unsigned long long)cputime64_to_clock_t(guest),
77                 (unsigned long long)cputime64_to_clock_t(guest_nice));
78         for_each_online_cpu(i) {
79
80                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
81                 user = kstat_cpu(i).cpustat.user;
82                 nice = kstat_cpu(i).cpustat.nice;
83                 system = kstat_cpu(i).cpustat.system;
84                 idle = kstat_cpu(i).cpustat.idle;
85                 idle = cputime64_add(idle, arch_idle_time(i));
86                 iowait = kstat_cpu(i).cpustat.iowait;
87                 irq = kstat_cpu(i).cpustat.irq;
88                 softirq = kstat_cpu(i).cpustat.softirq;
89                 steal = kstat_cpu(i).cpustat.steal;
90                 guest = kstat_cpu(i).cpustat.guest;
91                 guest_nice = kstat_cpu(i).cpustat.guest_nice;
92                 seq_printf(p,
93                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
94                         "%llu\n",
95                         i,
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),
104                         (unsigned long long)cputime64_to_clock_t(guest),
105                         (unsigned long long)cputime64_to_clock_t(guest_nice));
106         }
107         seq_printf(p, "intr %llu", (unsigned long long)sum);
108
109         /* sum again ? it could be updated? */
110         for_each_irq_nr(j)
111                 seq_printf(p, " %u", kstat_irqs(j));
112
113         seq_printf(p,
114                 "\nctxt %llu\n"
115                 "btime %lu\n"
116                 "processes %lu\n"
117                 "procs_running %lu\n"
118                 "procs_blocked %lu\n",
119                 nr_context_switches(),
120                 (unsigned long)jif,
121                 total_forks,
122                 nr_running(),
123                 nr_iowait());
124
125         seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
126
127         for (i = 0; i < NR_SOFTIRQS; i++)
128                 seq_printf(p, " %u", per_softirq_sums[i]);
129         seq_putc(p, '\n');
130
131         return 0;
132 }
133
134 static int stat_open(struct inode *inode, struct file *file)
135 {
136         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
137         char *buf;
138         struct seq_file *m;
139         int res;
140
141         /* don't ask for more than the kmalloc() max size */
142         if (size > KMALLOC_MAX_SIZE)
143                 size = KMALLOC_MAX_SIZE;
144         buf = kmalloc(size, GFP_KERNEL);
145         if (!buf)
146                 return -ENOMEM;
147
148         res = single_open(file, show_stat, NULL);
149         if (!res) {
150                 m = file->private_data;
151                 m->buf = buf;
152                 m->size = size;
153         } else
154                 kfree(buf);
155         return res;
156 }
157
158 static const struct file_operations proc_stat_operations = {
159         .open           = stat_open,
160         .read           = seq_read,
161         .llseek         = seq_lseek,
162         .release        = single_release,
163 };
164
165 static int __init proc_stat_init(void)
166 {
167         proc_create("stat", 0, NULL, &proc_stat_operations);
168         return 0;
169 }
170 module_init(proc_stat_init);