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  * 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: releng/9.0/sys/sys/lock_profile.h 194578 2009-06-21 09:01:12Z rdivacky $
   28  */
   29 
   30 
   31 #ifndef _SYS_LOCK_PROFILE_H_
   32 #define _SYS_LOCK_PROFILE_H_
   33 
   34 struct lock_profile_object;
   35 LIST_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
   43 u_int64_t nanoseconds(void);
   44 #endif
   45 
   46 extern volatile int lock_prof_enable;
   47 
   48 void lock_profile_obtain_lock_success(struct lock_object *lo, int contested,
   49     uint64_t waittime, const char *file, int line);
   50 void lock_profile_release_lock(struct lock_object *lo);
   51 void lock_profile_thread_exit(struct thread *td);
   52 
   53 
   54 static inline void
   55 lock_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_ */

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