| Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 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 | |
| Arjan van de Ven | ad0b0fd | 2009-02-10 11:42:26 -0800 | [diff] [blame] | 12 | #include <linux/compiler.h> |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 13 | struct task_struct; |
| 14 | |
| Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 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 | |
| Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 28 | |
| Arjan van de Ven | ad0b0fd | 2009-02-10 11:42:26 -0800 | [diff] [blame] | 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 | } |
| Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 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 |