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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#include <linux/sched.h>
18
19struct task_struct;
20
21int alloc_cpu_buffers(void);
22void free_cpu_buffers(void);
23
24void start_cpu_work(void);
25void end_cpu_work(void);
26
27/* CPU buffer is composed of such entries (which are
28 * also used for context switch notes)
29 */
30struct op_sample {
31 unsigned long eip;
32 unsigned long event;
33};
34
35struct oprofile_cpu_buffer {
36 volatile unsigned long head_pos;
37 volatile unsigned long tail_pos;
38 unsigned long buffer_size;
39 struct task_struct * last_task;
40 int last_is_kernel;
41 int tracing;
42 struct op_sample * buffer;
43 unsigned long sample_received;
44 unsigned long sample_lost_overflow;
45 unsigned long backtrace_aborted;
46 unsigned long sample_invalid_eip;
47 int cpu;
48 struct delayed_work work;
49};
50
51DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
52
53void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
54
55/* transient events for the CPU buffer -> event buffer */
56#define CPU_IS_KERNEL 1
57#define CPU_TRACE_BEGIN 2
58
59#endif /* OPROFILE_CPU_BUFFER_H */