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1da177e4 LT |
1 | /** |
2 | * @file cpu_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 OPROFILE_CPU_BUFFER_H | |
11 | #define OPROFILE_CPU_BUFFER_H | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/cache.h> | |
17 | ||
18 | struct task_struct; | |
19 | ||
20 | int alloc_cpu_buffers(void); | |
21 | void free_cpu_buffers(void); | |
22 | ||
23 | void start_cpu_work(void); | |
24 | void end_cpu_work(void); | |
25 | ||
26 | /* CPU buffer is composed of such entries (which are | |
27 | * also used for context switch notes) | |
28 | */ | |
29 | struct op_sample { | |
30 | unsigned long eip; | |
31 | unsigned long event; | |
32 | }; | |
33 | ||
34 | struct oprofile_cpu_buffer { | |
35 | volatile unsigned long head_pos; | |
36 | volatile unsigned long tail_pos; | |
37 | unsigned long buffer_size; | |
38 | struct task_struct * last_task; | |
39 | int last_is_kernel; | |
40 | int tracing; | |
41 | struct op_sample * buffer; | |
42 | unsigned long sample_received; | |
43 | unsigned long sample_lost_overflow; | |
44 | unsigned long backtrace_aborted; | |
45 | int cpu; | |
c4028958 | 46 | struct delayed_work work; |
1da177e4 LT |
47 | } ____cacheline_aligned; |
48 | ||
49 | extern struct oprofile_cpu_buffer cpu_buffer[]; | |
50 | ||
51 | void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf); | |
52 | ||
53 | /* transient events for the CPU buffer -> event buffer */ | |
54 | #define CPU_IS_KERNEL 1 | |
55 | #define CPU_TRACE_BEGIN 2 | |
56 | ||
57 | #endif /* OPROFILE_CPU_BUFFER_H */ |