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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 |
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 |
43 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) |
44 | { |
45 | } |
46 | |
47 | static inline void clear_all_latency_tracing(struct task_struct *p) |
48 | { |
49 | } |
50 | |
51 | #endif |
52 | |
53 | #endif |
54 |
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