Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[linux-2.6] / fs / proc / stat.c
1 #include <linux/cpumask.h>
2 #include <linux/fs.h>
3 #include <linux/gfp.h>
4 #include <linux/init.h>
5 #include <linux/interrupt.h>
6 #include <linux/kernel_stat.h>
7 #include <linux/proc_fs.h>
8 #include <linux/sched.h>
9 #include <linux/seq_file.h>
10 #include <linux/slab.h>
11 #include <linux/time.h>
12 #include <linux/irqnr.h>
13 #include <asm/cputime.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 #ifndef arch_idle_time
22 #define arch_idle_time(cpu) 0
23 #endif
24
25 static int show_stat(struct seq_file *p, void *v)
26 {
27         int i, j;
28         unsigned long jif;
29         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
30         cputime64_t guest;
31         u64 sum = 0;
32         struct timespec boottime;
33         unsigned int per_irq_sum;
34
35         user = nice = system = idle = iowait =
36                 irq = softirq = steal = cputime64_zero;
37         guest = 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                 for_each_irq_nr(j) {
53                         sum += kstat_irqs_cpu(j, i);
54                 }
55                 sum += arch_irq_stat_cpu(i);
56         }
57         sum += arch_irq_stat();
58
59         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
60                 (unsigned long long)cputime64_to_clock_t(user),
61                 (unsigned long long)cputime64_to_clock_t(nice),
62                 (unsigned long long)cputime64_to_clock_t(system),
63                 (unsigned long long)cputime64_to_clock_t(idle),
64                 (unsigned long long)cputime64_to_clock_t(iowait),
65                 (unsigned long long)cputime64_to_clock_t(irq),
66                 (unsigned long long)cputime64_to_clock_t(softirq),
67                 (unsigned long long)cputime64_to_clock_t(steal),
68                 (unsigned long long)cputime64_to_clock_t(guest));
69         for_each_online_cpu(i) {
70
71                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
72                 user = kstat_cpu(i).cpustat.user;
73                 nice = kstat_cpu(i).cpustat.nice;
74                 system = kstat_cpu(i).cpustat.system;
75                 idle = kstat_cpu(i).cpustat.idle;
76                 idle = cputime64_add(idle, arch_idle_time(i));
77                 iowait = kstat_cpu(i).cpustat.iowait;
78                 irq = kstat_cpu(i).cpustat.irq;
79                 softirq = kstat_cpu(i).cpustat.softirq;
80                 steal = kstat_cpu(i).cpustat.steal;
81                 guest = kstat_cpu(i).cpustat.guest;
82                 seq_printf(p,
83                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
84                         i,
85                         (unsigned long long)cputime64_to_clock_t(user),
86                         (unsigned long long)cputime64_to_clock_t(nice),
87                         (unsigned long long)cputime64_to_clock_t(system),
88                         (unsigned long long)cputime64_to_clock_t(idle),
89                         (unsigned long long)cputime64_to_clock_t(iowait),
90                         (unsigned long long)cputime64_to_clock_t(irq),
91                         (unsigned long long)cputime64_to_clock_t(softirq),
92                         (unsigned long long)cputime64_to_clock_t(steal),
93                         (unsigned long long)cputime64_to_clock_t(guest));
94         }
95         seq_printf(p, "intr %llu", (unsigned long long)sum);
96
97         /* sum again ? it could be updated? */
98         for_each_irq_nr(j) {
99                 per_irq_sum = 0;
100                 for_each_possible_cpu(i)
101                         per_irq_sum += kstat_irqs_cpu(j, i);
102
103                 seq_printf(p, " %u", per_irq_sum);
104         }
105
106         seq_printf(p,
107                 "\nctxt %llu\n"
108                 "btime %lu\n"
109                 "processes %lu\n"
110                 "procs_running %lu\n"
111                 "procs_blocked %lu\n",
112                 nr_context_switches(),
113                 (unsigned long)jif,
114                 total_forks,
115                 nr_running(),
116                 nr_iowait());
117
118         return 0;
119 }
120
121 static int stat_open(struct inode *inode, struct file *file)
122 {
123         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
124         char *buf;
125         struct seq_file *m;
126         int res;
127
128         /* don't ask for more than the kmalloc() max size, currently 128 KB */
129         if (size > 128 * 1024)
130                 size = 128 * 1024;
131         buf = kmalloc(size, GFP_KERNEL);
132         if (!buf)
133                 return -ENOMEM;
134
135         res = single_open(file, show_stat, NULL);
136         if (!res) {
137                 m = file->private_data;
138                 m->buf = buf;
139                 m->size = size;
140         } else
141                 kfree(buf);
142         return res;
143 }
144
145 static const struct file_operations proc_stat_operations = {
146         .open           = stat_open,
147         .read           = seq_read,
148         .llseek         = seq_lseek,
149         .release        = single_release,
150 };
151
152 static int __init proc_stat_init(void)
153 {
154         proc_create("stat", 0, NULL, &proc_stat_operations);
155         return 0;
156 }
157 module_init(proc_stat_init);