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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.
*
* $FreeBSD$
*/
#ifndef _SYS_LOCK_PROFILE_H_
#define _SYS_LOCK_PROFILE_H_
#ifdef LOCK_PROFILING
#include <sys/stdint.h>
#include <sys/ktr.h>
#include <sys/mutex.h>
#include <machine/atomic.h>
#include <machine/cpufunc.h>
#ifndef LPROF_HASH_SIZE
#define LPROF_HASH_SIZE 4096
#define LPROF_HASH_MASK (LPROF_HASH_SIZE - 1)
#endif
#ifndef USE_CPU_NANOSECONDS
u_int64_t nanoseconds(void);
#endif
struct lock_prof {
const char *name;
const char *type;
const char *file;
u_int namehash;
int line;
uintmax_t cnt_max;
uintmax_t cnt_tot;
uintmax_t cnt_wait;
uintmax_t cnt_cur;
uintmax_t cnt_contest_holding;
uintmax_t cnt_contest_locking;
};
extern struct lock_prof lprof_buf[LPROF_HASH_SIZE];
#define LPROF_SBUF_SIZE 256 * 400
/* We keep a smaller pool of spin mutexes for protecting the lprof hash entries */
#define LPROF_LOCK_SIZE 16
#define LPROF_LOCK_MASK (LPROF_LOCK_SIZE - 1)
#define LPROF_LHASH(hash) ((hash) & LPROF_LOCK_MASK)
#define LPROF_LOCK(hash) mtx_lock_spin(&lprof_locks[LPROF_LHASH(hash)])
#define LPROF_UNLOCK(hash) mtx_unlock_spin(&lprof_locks[LPROF_LHASH(hash)])
extern struct mtx lprof_locks[LPROF_LOCK_SIZE];
extern 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_update_wait(struct lock_object *lo, uint64_t waitstart);
void _lock_profile_release_lock(struct lock_object *lo);
static inline void lock_profile_object_init(struct lock_object *lo, struct lock_class *class, const char *name) {
const char *p;
u_int hash = 0;
struct lock_profile_object *l = &lo->lo_profile_obj;
l->lpo_acqtime = 0;
l->lpo_waittime = 0;
l->lpo_filename = NULL;
l->lpo_lineno = 0;
l->lpo_contest_holding = 0;
l->lpo_contest_locking = 0;
l->lpo_type = class->lc_name;
/* Hash the mutex name to an int so we don't have to strcmp() it repeatedly */
for (p = name; *p != '\0'; p++)
hash = 31 * hash + *p;
l->lpo_namehash = hash;
#if 0
if (opts & MTX_PROFILE)
l->lpo_stack = stack_create();
#endif
}
static inline void
lock_profile_object_destroy(struct lock_object *lo)
{
#if 0
struct lock_profile_object *l = &lo->lo_profile_obj;
if (lo->lo_flags & LO_PROFILE)
stack_destroy(l->lpo_stack);
#endif
}
static inline void lock_profile_obtain_lock_failed(struct lock_object *lo, int *contested,
uint64_t *waittime)
{
struct lock_profile_object *l = &lo->lo_profile_obj;
if (lock_prof_enable && *contested == 0) {
*waittime = nanoseconds();
atomic_add_int(&l->lpo_contest_holding, 1);
*contested = 1;
}
}
static inline void lock_profile_obtain_lock_success(struct lock_object *lo, int contested, uint64_t waittime, const char *file, int line)
{
/* don't reset the timer when/if recursing */
if (lock_prof_enable && lo->lo_profile_obj.lpo_acqtime == 0) {
#ifdef LOCK_PROFILING_FAST
if (contested == 0)
return;
#endif
_lock_profile_obtain_lock_success(lo, contested, waittime, file, line);
}
}
static inline void lock_profile_release_lock(struct lock_object *lo)
{
struct lock_profile_object *l = &lo->lo_profile_obj;
if (l->lpo_acqtime)
_lock_profile_release_lock(lo);
}
#else /* !LOCK_PROFILING */
static inline void lock_profile_update_wait(struct lock_object *lo, uint64_t waitstart) {;}
static inline void lock_profile_update_contest_locking(struct lock_object *lo, int contested) {;}
static inline void lock_profile_release_lock(struct lock_object *lo) {;}
static inline void lock_profile_obtain_lock_failed(struct lock_object *lo, int *contested, uint64_t *waittime) {;}
static inline void lock_profile_obtain_lock_success(struct lock_object *lo, int contested, uint64_t waittime,
const char *file, int line) {;}
static inline void lock_profile_object_destroy(struct lock_object *lo) {;}
static inline void lock_profile_object_init(struct lock_object *lo, struct lock_class *class, const char *name) {;}
#endif /* !LOCK_PROFILING */
#endif /* _SYS_LOCK_PROFILE_H_ */
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