summaryrefslogblamecommitdiff
path: root/drivers/oprofile/event_buffer.h
blob: a8d5bb3cba89a9f7b3e770b2b6af2765764648b8 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12











                                               
                        
                        
 


                             
 






                                                                 

                                                    
 


                           
                                                      
 


                                           
                                 
 
                           
/**
 * @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 <linux/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 */