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 unsigned long sample_invalid_eip;
46 int cpu;
47 struct delayed_work work;
48 } ____cacheline_aligned;
49
50 extern struct oprofile_cpu_buffer cpu_buffer[];
51
52 void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
53
54 /* transient events for the CPU buffer -> event buffer */
55 #define CPU_IS_KERNEL 1
56 #define CPU_TRACE_BEGIN 2
57
58 #endif /* OPROFILE_CPU_BUFFER_H */
59
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