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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> |
029632fb PZ |
13 | struct task_struct; |
14 | ||
9745512c AV |
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 | ||
9745512c | 28 | |
ad0b0fd5 AV |
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 | } | |
9745512c AV |
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 |