Linux Kernel  3.7.1
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stat.c
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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 #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 
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 
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 
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 
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 
80 static int show_stat(struct seq_file *p, void *v)
81 {
82  int i, j;
83  unsigned long jif;
84  u64 user, nice, system, idle, iowait, irq, softirq, steal;
85  u64 guest, guest_nice;
86  u64 sum = 0;
87  u64 sum_softirq = 0;
88  unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
89  struct timespec boottime;
90 
91  user = nice = system = idle = iowait =
92  irq = softirq = steal = 0;
93  guest = guest_nice = 0;
94  getboottime(&boottime);
95  jif = boottime.tv_sec;
96 
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);
110 
111  for (j = 0; j < NR_SOFTIRQS; j++) {
112  unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
113 
114  per_softirq_sums[j] += softirq_stat;
115  sum_softirq += softirq_stat;
116  }
117  }
118  sum += arch_irq_stat();
119 
120  seq_puts(p, "cpu ");
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));
131  seq_putc(p, '\n');
132 
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));
156  seq_putc(p, '\n');
157  }
158  seq_printf(p, "intr %llu", (unsigned long long)sum);
159 
160  /* sum again ? it could be updated? */
161  for_each_irq_nr(j)
162  seq_put_decimal_ull(p, ' ', kstat_irqs(j));
163 
164  seq_printf(p,
165  "\nctxt %llu\n"
166  "btime %lu\n"
167  "processes %lu\n"
168  "procs_running %lu\n"
169  "procs_blocked %lu\n",
170  nr_context_switches(),
171  (unsigned long)jif,
172  total_forks,
173  nr_running(),
174  nr_iowait());
175 
176  seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
177 
178  for (i = 0; i < NR_SOFTIRQS; i++)
179  seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
180  seq_putc(p, '\n');
181 
182  return 0;
183 }
184 
185 static int stat_open(struct inode *inode, struct file *file)
186 {
187  unsigned size = 1024 + 128 * num_possible_cpus();
188  char *buf;
189  struct seq_file *m;
190  int res;
191 
192  /* minimum size to display an interrupt count : 2 bytes */
193  size += 2 * nr_irqs;
194 
195  /* don't ask for more than the kmalloc() max size */
196  if (size > KMALLOC_MAX_SIZE)
197  size = KMALLOC_MAX_SIZE;
198  buf = kmalloc(size, GFP_KERNEL);
199  if (!buf)
200  return -ENOMEM;
201 
202  res = single_open(file, show_stat, NULL);
203  if (!res) {
204  m = file->private_data;
205  m->buf = buf;
206  m->size = ksize(buf);
207  } else
208  kfree(buf);
209  return res;
210 }
211 
212 static const struct file_operations proc_stat_operations = {
213  .open = stat_open,
214  .read = seq_read,
215  .llseek = seq_lseek,
216  .release = single_release,
217 };
218 
219 static int __init proc_stat_init(void)
220 {
221  proc_create("stat", 0, NULL, &proc_stat_operations);
222  return 0;
223 }
224 module_init(proc_stat_init);
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