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9745512c AV |
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 | ||
ad0b0fd5 | 12 | #include <linux/compiler.h> |
9745512c AV |
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 | ||
ad0b0fd5 AV |
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 | } | |
9745512c AV |
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 |