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 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_ */ 76