projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| cb251765 MG |
40 | extern int sysctl_latencytop(struct ctl_table *table, int write, |
| 41 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
| 42 | ||
| 9745512c AV |
43 | #else |
| 44 | ||
| 45 | static inline void | |
| 46 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) | |
| 47 | { | |
| 48 | } | |
| 49 | ||
| 50 | static inline void clear_all_latency_tracing(struct task_struct *p) | |
| 51 | { | |
| 52 | } | |
| 53 | ||
| 54 | #endif | |
| 55 | ||
| 56 | #endif |