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 * $FreeBSD$ 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_ */ 78