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