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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>
13 struct task_struct;
14 
15 #ifdef CONFIG_LATENCYTOP
16 
17 #define LT_SAVECOUNT		32
18 #define LT_BACKTRACEDEPTH	12
19 
20 struct latency_record {
21 	unsigned long	backtrace[LT_BACKTRACEDEPTH];
22 	unsigned int	count;
23 	unsigned long	time;
24 	unsigned long	max;
25 };
26 
27 
28 
29 extern int latencytop_enabled;
30 void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
31 static inline void
account_scheduler_latency(struct task_struct * task,int usecs,int inter)32 account_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 
38 void clear_all_latency_tracing(struct task_struct *p);
39 
40 #else
41 
42 static inline void
account_scheduler_latency(struct task_struct * task,int usecs,int inter)43 account_scheduler_latency(struct task_struct *task, int usecs, int inter)
44 {
45 }
46 
clear_all_latency_tracing(struct task_struct * p)47 static inline void clear_all_latency_tracing(struct task_struct *p)
48 {
49 }
50 
51 #endif
52 
53 #endif
54