3c2270a8300c40833bcf0900968635e2b166abc6
[linux-2.6.git] / drivers / oprofile / oprofile_stats.c
1 /**
2  * @file oprofile_stats.c
3  *
4  * @remark Copyright 2002 OProfile authors
5  * @remark Read the file COPYING
6  *
7  * @author John Levon
8  */
9
10 #include <linux/oprofile.h>
11 #include <linux/smp.h>
12 #include <linux/cpumask.h>
13 #include <linux/threads.h>
14
15 #include "oprofile_stats.h"
16 #include "cpu_buffer.h"
17
18 struct oprofile_stat_struct oprofile_stats;
19
20 void oprofile_reset_stats(void)
21 {
22         struct oprofile_cpu_buffer *cpu_buf;
23         int i;
24
25         for_each_possible_cpu(i) {
26                 cpu_buf = &per_cpu(cpu_buffer, i);
27                 cpu_buf->sample_received = 0;
28                 cpu_buf->sample_lost_overflow = 0;
29                 cpu_buf->backtrace_aborted = 0;
30                 cpu_buf->sample_invalid_eip = 0;
31         }
32
33         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
34         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
35         atomic_set(&oprofile_stats.event_lost_overflow, 0);
36         atomic_set(&oprofile_stats.bt_lost_no_mapping, 0);
37 }
38
39
40 void oprofile_create_stats_files(struct super_block *sb, struct dentry *root)
41 {
42         struct oprofile_cpu_buffer *cpu_buf;
43         struct dentry *cpudir;
44         struct dentry *dir;
45         char buf[10];
46         int i;
47
48         dir = oprofilefs_mkdir(sb, root, "stats");
49         if (!dir)
50                 return;
51
52         for_each_possible_cpu(i) {
53                 cpu_buf = &per_cpu(cpu_buffer, i);
54                 snprintf(buf, 10, "cpu%d", i);
55                 cpudir = oprofilefs_mkdir(sb, dir, buf);
56
57                 /* Strictly speaking access to these ulongs is racy,
58                  * but we can't simply lock them, and they are
59                  * informational only.
60                  */
61                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
62                         &cpu_buf->sample_received);
63                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
64                         &cpu_buf->sample_lost_overflow);
65                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
66                         &cpu_buf->backtrace_aborted);
67                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
68                         &cpu_buf->sample_invalid_eip);
69         }
70
71         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
72                 &oprofile_stats.sample_lost_no_mm);
73         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
74                 &oprofile_stats.sample_lost_no_mapping);
75         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
76                 &oprofile_stats.event_lost_overflow);
77         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
78                 &oprofile_stats.bt_lost_no_mapping);
79 }