kern_lockstat.c revision 315394 
1/*-
2 * Copyright 2008-2009 Stacey Son <sson@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/sys/kern/kern_lockstat.c 315394 2017-03-16 08:29:09Z mjg $");
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/lock.h>
32#include <sys/lockstat.h>
33#include <sys/sdt.h>
34#include <sys/time.h>
35
36SDT_PROVIDER_DEFINE(lockstat);
37
38SDT_PROBE_DEFINE1(lockstat, , , adaptive__acquire, "struct mtx *");
39SDT_PROBE_DEFINE1(lockstat, , , adaptive__release, "struct mtx *");
40SDT_PROBE_DEFINE2(lockstat, , , adaptive__spin, "struct mtx *", "uint64_t");
41SDT_PROBE_DEFINE2(lockstat, , , adaptive__block, "struct mtx *", "uint64_t");
42
43SDT_PROBE_DEFINE1(lockstat, , , spin__acquire, "struct mtx *");
44SDT_PROBE_DEFINE1(lockstat, , , spin__release, "struct mtx *");
45SDT_PROBE_DEFINE2(lockstat, , , spin__spin, "struct mtx *", "uint64_t");
46
47SDT_PROBE_DEFINE2(lockstat, , , rw__acquire, "struct rwlock *", "int");
48SDT_PROBE_DEFINE2(lockstat, , , rw__release, "struct rwlock *", "int");
49SDT_PROBE_DEFINE5(lockstat, , , rw__block, "struct rwlock *", "uint64_t", "int",
50    "int", "int");
51SDT_PROBE_DEFINE2(lockstat, , , rw__spin, "struct rwlock *", "uint64_t");
52SDT_PROBE_DEFINE1(lockstat, , , rw__upgrade, "struct rwlock *");
53SDT_PROBE_DEFINE1(lockstat, , , rw__downgrade, "struct rwlock *");
54
55SDT_PROBE_DEFINE2(lockstat, , , sx__acquire, "struct sx *", "int");
56SDT_PROBE_DEFINE2(lockstat, , , sx__release, "struct sx *", "int");
57SDT_PROBE_DEFINE5(lockstat, , , sx__block, "struct sx *", "uint64_t", "int",
58    "int", "int");
59SDT_PROBE_DEFINE2(lockstat, , , sx__spin, "struct sx *", "uint64_t");
60SDT_PROBE_DEFINE1(lockstat, , , sx__upgrade, "struct sx *");
61SDT_PROBE_DEFINE1(lockstat, , , sx__downgrade, "struct sx *");
62
63SDT_PROBE_DEFINE2(lockstat, , , thread__spin, "struct mtx *", "uint64_t");
64
65volatile int __read_mostly lockstat_enabled;
66
67uint64_t
68lockstat_nsecs(struct lock_object *lo)
69{
70	struct bintime bt;
71	uint64_t ns;
72
73	if (!lockstat_enabled)
74		return (0);
75	if ((lo->lo_flags & LO_NOPROFILE) != 0)
76		return (0);
77
78	binuptime(&bt);
79	ns = bt.sec * (uint64_t)1000000000;
80	ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
81	return (ns);
82}
83