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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
40extern int sysctl_latencytop(struct ctl_table *table, int write,
41 void __user *buffer, size_t *lenp, loff_t *ppos);
42
43#else
44
45static inline void
46account_scheduler_latency(struct task_struct *task, int usecs, int inter)
47{
48}
49
50static inline void clear_all_latency_tracing(struct task_struct *p)
51{
52}
53
54#endif
55
56#endif