1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006 Kip Macy kmacy@FreeBSD.org
5 * Copyright (c) 2006 Kris Kennaway kris@FreeBSD.org
6 * Copyright (c) 2006 Dag-Erling Smorgrav des@des.no
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHAL THE AUTHORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: releng/12.0/sys/sys/lock_profile.h 326256 2017-11-27 15:01:59Z pfg $
30 */
31
32
33 #ifndef _SYS_LOCK_PROFILE_H_
34 #define _SYS_LOCK_PROFILE_H_
35
36 struct lock_profile_object;
37 LIST_HEAD(lpohead, lock_profile_object);
38
39 #ifdef _KERNEL
40 #ifdef LOCK_PROFILING
41 #include <machine/cpufunc.h>
42 #include <sys/lock.h>
43
44 #ifndef USE_CPU_NANOSECONDS
45 u_int64_t nanoseconds(void);
46 #endif
47
48 extern volatile int lock_prof_enable;
49
50 void lock_profile_obtain_lock_success(struct lock_object *lo, int contested,
51 uint64_t waittime, const char *file, int line);
52 void lock_profile_release_lock(struct lock_object *lo);
53 void lock_profile_thread_exit(struct thread *td);
54
55
56 static inline void
57 lock_profile_obtain_lock_failed(struct lock_object *lo, int *contested,
58 uint64_t *waittime)
59 {
60 if (!lock_prof_enable || (lo->lo_flags & LO_NOPROFILE) || *contested)
61 return;
62 *waittime = nanoseconds();
63 *contested = 1;
64 }
65
66 #else /* !LOCK_PROFILING */
67
68 #define lock_profile_release_lock(lo) (void)0
69 #define lock_profile_obtain_lock_failed(lo, contested, waittime) (void)0
70 #define lock_profile_obtain_lock_success(lo, contested, waittime, file, line) (void)0
71 #define lock_profile_thread_exit(td) (void)0
72
73 #endif /* !LOCK_PROFILING */
74
75 #endif /* _KERNEL */
76
77 #endif /* _SYS_LOCK_PROFILE_H_ */
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