Linux-2.6.12-rc2
[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_cpu(i) {
26                 cpu_buf = &cpu_buffer[i]; 
27                 cpu_buf->sample_received = 0;
28                 cpu_buf->sample_lost_overflow = 0;
29         }
30  
31         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
32         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
33         atomic_set(&oprofile_stats.event_lost_overflow, 0);
34 }
35
36
37 void oprofile_create_stats_files(struct super_block * sb, struct dentry * root)
38 {
39         struct oprofile_cpu_buffer * cpu_buf;
40         struct dentry * cpudir;
41         struct dentry * dir;
42         char buf[10];
43         int i;
44
45         dir = oprofilefs_mkdir(sb, root, "stats");
46         if (!dir)
47                 return;
48
49         for_each_cpu(i) {
50                 cpu_buf = &cpu_buffer[i]; 
51                 snprintf(buf, 10, "cpu%d", i);
52                 cpudir = oprofilefs_mkdir(sb, dir, buf);
53  
54                 /* Strictly speaking access to these ulongs is racy,
55                  * but we can't simply lock them, and they are
56                  * informational only.
57                  */
58                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
59                         &cpu_buf->sample_received);
60                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
61                         &cpu_buf->sample_lost_overflow);
62                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
63                         &cpu_buf->backtrace_aborted);
64         }
65  
66         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
67                 &oprofile_stats.sample_lost_no_mm);
68         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
69                 &oprofile_stats.sample_lost_no_mapping);
70         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
71                 &oprofile_stats.event_lost_overflow);
72         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
73                 &oprofile_stats.bt_lost_no_mapping);
74 }