Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[linux-2.6-microblaze.git] / include / linux / latencytop.h
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_all_latency_tracing(struct task_struct *p);
40
41 extern int sysctl_latencytop(struct ctl_table *table, int write,
42                         void __user *buffer, size_t *lenp, loff_t *ppos);
43
44 #else
45
46 static inline void
47 account_scheduler_latency(struct task_struct *task, int usecs, int inter)
48 {
49 }
50
51 static inline void clear_all_latency_tracing(struct task_struct *p)
52 {
53 }
54
55 #endif
56
57 #endif