xref: /freebsd/sys/kern/kern_lockstat.c (revision 076ad2f836d5f49dc1375f1677335a48fe0d4b82)
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("$FreeBSD$");
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 
36 SDT_PROVIDER_DEFINE(lockstat);
37 
38 SDT_PROBE_DEFINE1(lockstat, , , adaptive__acquire, "struct mtx *");
39 SDT_PROBE_DEFINE1(lockstat, , , adaptive__release, "struct mtx *");
40 SDT_PROBE_DEFINE2(lockstat, , , adaptive__spin, "struct mtx *", "uint64_t");
41 SDT_PROBE_DEFINE2(lockstat, , , adaptive__block, "struct mtx *", "uint64_t");
42 
43 SDT_PROBE_DEFINE1(lockstat, , , spin__acquire, "struct mtx *");
44 SDT_PROBE_DEFINE1(lockstat, , , spin__release, "struct mtx *");
45 SDT_PROBE_DEFINE2(lockstat, , , spin__spin, "struct mtx *", "uint64_t");
46 
47 SDT_PROBE_DEFINE2(lockstat, , , rw__acquire, "struct rwlock *", "int");
48 SDT_PROBE_DEFINE2(lockstat, , , rw__release, "struct rwlock *", "int");
49 SDT_PROBE_DEFINE5(lockstat, , , rw__block, "struct rwlock *", "uint64_t", "int",
50     "int", "int");
51 SDT_PROBE_DEFINE2(lockstat, , , rw__spin, "struct rwlock *", "uint64_t");
52 SDT_PROBE_DEFINE1(lockstat, , , rw__upgrade, "struct rwlock *");
53 SDT_PROBE_DEFINE1(lockstat, , , rw__downgrade, "struct rwlock *");
54 
55 SDT_PROBE_DEFINE2(lockstat, , , sx__acquire, "struct sx *", "int");
56 SDT_PROBE_DEFINE2(lockstat, , , sx__release, "struct sx *", "int");
57 SDT_PROBE_DEFINE5(lockstat, , , sx__block, "struct sx *", "uint64_t", "int",
58     "int", "int");
59 SDT_PROBE_DEFINE2(lockstat, , , sx__spin, "struct sx *", "uint64_t");
60 SDT_PROBE_DEFINE1(lockstat, , , sx__upgrade, "struct sx *");
61 SDT_PROBE_DEFINE1(lockstat, , , sx__downgrade, "struct sx *");
62 
63 SDT_PROBE_DEFINE2(lockstat, , , thread__spin, "struct mtx *", "uint64_t");
64 
65 volatile int __read_mostly lockstat_enabled;
66 
67 uint64_t
68 lockstat_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