1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * Authors: Waiman Long <longman@redhat.com> |
14 | */ |
15 | |
16 | #ifndef __LOCKING_LOCK_EVENTS_H |
17 | #define __LOCKING_LOCK_EVENTS_H |
18 | |
19 | enum lock_events { |
20 | |
21 | #include "lock_events_list.h" |
22 | |
23 | lockevent_num, /* Total number of lock event counts */ |
24 | LOCKEVENT_reset_cnts = lockevent_num, |
25 | }; |
26 | |
27 | #ifdef CONFIG_LOCK_EVENT_COUNTS |
28 | /* |
29 | * Per-cpu counters |
30 | */ |
31 | DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]); |
32 | |
33 | /* |
34 | * Increment the statistical counters. use raw_cpu_inc() because of lower |
35 | * overhead and we don't care if we loose the occasional update. |
36 | */ |
37 | static inline void __lockevent_inc(enum lock_events event, bool cond) |
38 | { |
39 | if (cond) |
40 | raw_cpu_inc(lockevents[event]); |
41 | } |
42 | |
43 | #define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true) |
44 | #define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c) |
45 | |
46 | static inline void __lockevent_add(enum lock_events event, int inc) |
47 | { |
48 | raw_cpu_add(lockevents[event], inc); |
49 | } |
50 | |
51 | #define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c) |
52 | |
53 | #else /* CONFIG_LOCK_EVENT_COUNTS */ |
54 | |
55 | #define lockevent_inc(ev) |
56 | #define lockevent_add(ev, c) |
57 | #define lockevent_cond_inc(ev, c) |
58 | |
59 | #endif /* CONFIG_LOCK_EVENT_COUNTS */ |
60 | |
61 | ssize_t lockevent_read(struct file *file, char __user *user_buf, |
62 | size_t count, loff_t *ppos); |
63 | |
64 | #endif /* __LOCKING_LOCK_EVENTS_H */ |
65 | |