1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * latencytop.h: Infrastructure for displaying latency |
4 | * |
5 | * (C) Copyright 2008 Intel Corporation |
6 | * Author: Arjan van de Ven <arjan@linux.intel.com> |
7 | * |
8 | */ |
9 | |
10 | #ifndef _INCLUDE_GUARD_LATENCYTOP_H_ |
11 | #define _INCLUDE_GUARD_LATENCYTOP_H_ |
12 | |
13 | #include <linux/compiler.h> |
14 | struct task_struct; |
15 | |
16 | #ifdef CONFIG_LATENCYTOP |
17 | |
18 | #define LT_SAVECOUNT 32 |
19 | #define LT_BACKTRACEDEPTH 12 |
20 | |
21 | struct latency_record { |
22 | unsigned long backtrace[LT_BACKTRACEDEPTH]; |
23 | unsigned int count; |
24 | unsigned long time; |
25 | unsigned long max; |
26 | }; |
27 | |
28 | |
29 | |
30 | extern int latencytop_enabled; |
31 | void __account_scheduler_latency(struct task_struct *task, int usecs, int inter); |
32 | static inline void |
33 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) |
34 | { |
35 | if (unlikely(latencytop_enabled)) |
36 | __account_scheduler_latency(task, usecs, inter); |
37 | } |
38 | |
39 | void clear_tsk_latency_tracing(struct task_struct *p); |
40 | |
41 | #else |
42 | |
43 | static inline void |
44 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) |
45 | { |
46 | } |
47 | |
48 | static inline void clear_tsk_latency_tracing(struct task_struct *p) |
49 | { |
50 | } |
51 | |
52 | #endif |
53 | |
54 | #endif |
55 | |