1/*
2 * latencytop.h: Infrastructure for displaying latency
3 *
4 * (C) Copyright 2008 Intel Corporation
5 * Author: Arjan van de Ven <arjan@linux.intel.com>
6 *
7 */
8
9#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
10#define _INCLUDE_GUARD_LATENCYTOP_H_
11
12#include <linux/compiler.h>
13struct task_struct;
14
15#ifdef CONFIG_LATENCYTOP
16
17#define LT_SAVECOUNT		32
18#define LT_BACKTRACEDEPTH	12
19
20struct latency_record {
21	unsigned long	backtrace[LT_BACKTRACEDEPTH];
22	unsigned int	count;
23	unsigned long	time;
24	unsigned long	max;
25};
26
27
28
29extern int latencytop_enabled;
30void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
31static inline void
32account_scheduler_latency(struct task_struct *task, int usecs, int inter)
33{
34	if (unlikely(latencytop_enabled))
35		__account_scheduler_latency(task, usecs, inter);
36}
37
38void clear_all_latency_tracing(struct task_struct *p);
39
40#else
41
42static inline void
43account_scheduler_latency(struct task_struct *task, int usecs, int inter)
44{
45}
46
47static inline void clear_all_latency_tracing(struct task_struct *p)
48{
49}
50
51#endif
52
53#endif
54