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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 | #ifdef CONFIG_LATENCYTOP |
14 | |
15 | #define LT_SAVECOUNT 32 |
16 | #define LT_BACKTRACEDEPTH 12 |
17 | |
18 | struct latency_record { |
19 | unsigned long backtrace[LT_BACKTRACEDEPTH]; |
20 | unsigned int count; |
21 | unsigned long time; |
22 | unsigned long max; |
23 | }; |
24 | |
25 | |
26 | struct task_struct; |
27 | |
28 | extern int latencytop_enabled; |
29 | void __account_scheduler_latency(struct task_struct *task, int usecs, int inter); |
30 | static inline void |
31 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) |
32 | { |
33 | if (unlikely(latencytop_enabled)) |
34 | __account_scheduler_latency(task, usecs, inter); |
35 | } |
36 | |
37 | void clear_all_latency_tracing(struct task_struct *p); |
38 | |
39 | #else |
40 | |
41 | static inline void |
42 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) |
43 | { |
44 | } |
45 | |
46 | static inline void clear_all_latency_tracing(struct task_struct *p) |
47 | { |
48 | } |
49 | |
50 | #endif |
51 | |
52 | #endif |
53 |
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