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