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1da177e4 LT |
1 | /** |
2 | * @file event_buffer.h | |
3 | * | |
4 | * @remark Copyright 2002 OProfile authors | |
5 | * @remark Read the file COPYING | |
6 | * | |
7 | * @author John Levon <levon@movementarian.org> | |
8 | */ | |
9 | ||
10 | #ifndef EVENT_BUFFER_H | |
11 | #define EVENT_BUFFER_H | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <asm/semaphore.h> | |
15 | ||
16 | int alloc_event_buffer(void); | |
17 | ||
18 | void free_event_buffer(void); | |
19 | ||
20 | /* wake up the process sleeping on the event file */ | |
21 | void wake_up_buffer_waiter(void); | |
22 | ||
23 | /* Each escaped entry is prefixed by ESCAPE_CODE | |
24 | * then one of the following codes, then the | |
25 | * relevant data. | |
26 | */ | |
27 | #define ESCAPE_CODE ~0UL | |
28 | #define CTX_SWITCH_CODE 1 | |
29 | #define CPU_SWITCH_CODE 2 | |
30 | #define COOKIE_SWITCH_CODE 3 | |
31 | #define KERNEL_ENTER_SWITCH_CODE 4 | |
32 | #define KERNEL_EXIT_SWITCH_CODE 5 | |
33 | #define MODULE_LOADED_CODE 6 | |
34 | #define CTX_TGID_CODE 7 | |
35 | #define TRACE_BEGIN_CODE 8 | |
36 | #define TRACE_END_CODE 9 | |
37 | ||
0c0a400d JL |
38 | #define INVALID_COOKIE ~0UL |
39 | #define NO_COOKIE 0UL | |
40 | ||
1da177e4 LT |
41 | /* add data to the event buffer */ |
42 | void add_event_entry(unsigned long data); | |
43 | ||
44 | extern struct file_operations event_buffer_fops; | |
45 | ||
46 | /* mutex between sync_cpu_buffers() and the | |
47 | * file reading code. | |
48 | */ | |
49 | extern struct semaphore buffer_sem; | |
50 | ||
51 | #endif /* EVENT_BUFFER_H */ |