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
oprofile_reset_stats(void)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 }
37
38
oprofile_create_stats_files(struct super_block * sb,struct dentry * root)39 void oprofile_create_stats_files(struct super_block *sb, struct dentry *root)
40 {
41 struct oprofile_cpu_buffer *cpu_buf;
42 struct dentry *cpudir;
43 struct dentry *dir;
44 char buf[10];
45 int i;
46
47 dir = oprofilefs_mkdir(sb, root, "stats");
48 if (!dir)
49 return;
50
51 for_each_possible_cpu(i) {
52 cpu_buf = &per_cpu(cpu_buffer, i);
53 snprintf(buf, 10, "cpu%d", i);
54 cpudir = oprofilefs_mkdir(sb, dir, buf);
55
56 /* Strictly speaking access to these ulongs is racy,
57 * but we can't simply lock them, and they are
58 * informational only.
59 */
60 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
61 &cpu_buf->sample_received);
62 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
63 &cpu_buf->sample_lost_overflow);
64 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
65 &cpu_buf->backtrace_aborted);
66 oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
67 &cpu_buf->sample_invalid_eip);
68 }
69
70 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
71 &oprofile_stats.sample_lost_no_mm);
72 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
73 &oprofile_stats.sample_lost_no_mapping);
74 oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
75 &oprofile_stats.event_lost_overflow);
76 oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
77 &oprofile_stats.bt_lost_no_mapping);
78 }
79