summaryrefslogtreecommitdiffstats
path: root/drivers/oprofile/event_buffer.h
blob: 84bf324c577129c04a771c985e050eca9136e978 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/**
 * @file event_buffer.h
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 */

#ifndef EVENT_BUFFER_H
#define EVENT_BUFFER_H

#include <linux/types.h> 
#include <asm/mutex.h>
 
int alloc_event_buffer(void);

void free_event_buffer(void);
 
/**
 * Add data to the event buffer.
 * The data passed is free-form, but typically consists of
 * file offsets, dcookies, context information, and ESCAPE codes.
 */
void add_event_entry(unsigned long data);

/* wake up the process sleeping on the event file */
void wake_up_buffer_waiter(void);

#define INVALID_COOKIE ~0UL
#define NO_COOKIE 0UL

extern const struct file_operations event_buffer_fops;
 
/* mutex between sync_cpu_buffers() and the
 * file reading code.
 */
extern struct mutex buffer_mutex;
 
#endif /* EVENT_BUFFER_H */