oprofile: Implement performance counter multiplexing
[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 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
20 atomic_t multiplex_counter;
21 #endif
22
23 void oprofile_reset_stats(void)
24 {
25         struct oprofile_cpu_buffer *cpu_buf;
26         int i;
27
28         for_each_possible_cpu(i) {
29                 cpu_buf = &per_cpu(cpu_buffer, i);
30                 cpu_buf->sample_received = 0;
31                 cpu_buf->sample_lost_overflow = 0;
32                 cpu_buf->backtrace_aborted = 0;
33                 cpu_buf->sample_invalid_eip = 0;
34         }
35
36         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
37         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
38         atomic_set(&oprofile_stats.event_lost_overflow, 0);
39         atomic_set(&oprofile_stats.bt_lost_no_mapping, 0);
40 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
41         atomic_set(&multiplex_counter, 0);
42 #endif
43 }
44
45
46 void oprofile_create_stats_files(struct super_block *sb, struct dentry *root)
47 {
48         struct oprofile_cpu_buffer *cpu_buf;
49         struct dentry *cpudir;
50         struct dentry *dir;
51         char buf[10];
52         int i;
53
54         dir = oprofilefs_mkdir(sb, root, "stats");
55         if (!dir)
56                 return;
57
58         for_each_possible_cpu(i) {
59                 cpu_buf = &per_cpu(cpu_buffer, i);
60                 snprintf(buf, 10, "cpu%d", i);
61                 cpudir = oprofilefs_mkdir(sb, dir, buf);
62
63                 /* Strictly speaking access to these ulongs is racy,
64                  * but we can't simply lock them, and they are
65                  * informational only.
66                  */
67                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
68                         &cpu_buf->sample_received);
69                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
70                         &cpu_buf->sample_lost_overflow);
71                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
72                         &cpu_buf->backtrace_aborted);
73                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
74                         &cpu_buf->sample_invalid_eip);
75         }
76
77         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
78                 &oprofile_stats.sample_lost_no_mm);
79         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
80                 &oprofile_stats.sample_lost_no_mapping);
81         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
82                 &oprofile_stats.event_lost_overflow);
83         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
84                 &oprofile_stats.bt_lost_no_mapping);
85 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
86         oprofilefs_create_ro_atomic(sb, dir, "multiplex_counter",
87                 &multiplex_counter);
88 #endif
89 }