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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9745512c AV |
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 | ||
ad0b0fd5 | 13 | #include <linux/compiler.h> |
029632fb PZ |
14 | struct task_struct; |
15 | ||
9745512c AV |
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 | ||
9745512c | 29 | |
ad0b0fd5 AV |
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 | } | |
9745512c | 38 | |
e02c9b0d | 39 | void clear_tsk_latency_tracing(struct task_struct *p); |
9745512c | 40 | |
cb251765 MG |
41 | extern int sysctl_latencytop(struct ctl_table *table, int write, |
42 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
43 | ||
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44 | #else |
45 | ||
46 | static inline void | |
47 | account_scheduler_latency(struct task_struct *task, int usecs, int inter) | |
48 | { | |
49 | } | |
50 | ||
e02c9b0d | 51 | static inline void clear_tsk_latency_tracing(struct task_struct *p) |
9745512c AV |
52 | { |
53 | } | |
54 | ||
55 | #endif | |
56 | ||
57 | #endif |