The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/lock_profile.h

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    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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