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/*-
* Copyright (c) 2006 Kip Macy kmacy@FreeBSD.org
* Copyright (c) 2006 Kris Kennaway kris@FreeBSD.org
* Copyright (c) 2006 Dag-Erling Smorgrav des@des.no
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHAL THE AUTHORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/sys/lock_profile.h 194578 2009-06-21 09:01:12Z rdivacky $
*/
#ifndef _SYS_LOCK_PROFILE_H_
#define _SYS_LOCK_PROFILE_H_
struct lock_profile_object;
LIST_HEAD(lpohead, lock_profile_object);
#ifdef _KERNEL
#ifdef LOCK_PROFILING
#include <machine/cpufunc.h>
#include <sys/lock.h>
#ifndef USE_CPU_NANOSECONDS
u_int64_t nanoseconds(void);
#endif
extern volatile int lock_prof_enable;
void lock_profile_obtain_lock_success(struct lock_object *lo, int contested,
uint64_t waittime, const char *file, int line);
void lock_profile_release_lock(struct lock_object *lo);
void lock_profile_thread_exit(struct thread *td);
static inline void
lock_profile_obtain_lock_failed(struct lock_object *lo, int *contested,
uint64_t *waittime)
{
if (!lock_prof_enable || (lo->lo_flags & LO_NOPROFILE) || *contested)
return;
*waittime = nanoseconds();
*contested = 1;
}
#else /* !LOCK_PROFILING */
#define lock_profile_release_lock(lo) (void)0
#define lock_profile_obtain_lock_failed(lo, contested, waittime) (void)0
#define lock_profile_obtain_lock_success(lo, contested, waittime, file, line) (void)0
#define lock_profile_thread_exit(td) (void)0
#endif /* !LOCK_PROFILING */
#endif /* _KERNEL */
#endif /* _SYS_LOCK_PROFILE_H_ */