blob: c66c025abe757804f3cea7cfc389103293762c58 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
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
18struct task_struct;
19
20int alloc_cpu_buffers(void);
21void free_cpu_buffers(void);
22
23void start_cpu_work(void);
24void end_cpu_work(void);
25
26/* CPU buffer is composed of such entries (which are
27 * also used for context switch notes)
28 */
29struct op_sample {
30 unsigned long eip;
31 unsigned long event;
32};
33
34struct 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;
Philippe Eliedf9d1772007-11-14 16:58:48 -080045 unsigned long sample_invalid_eip;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 int cpu;
David Howellsc4028952006-11-22 14:57:56 +000047 struct delayed_work work;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048} ____cacheline_aligned;
49
50extern struct oprofile_cpu_buffer cpu_buffer[];
51
52void 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 */