sys/kern/kern_lockstat.c

   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/lock.h>
  31 #include <sys/lockstat.h>
  32 #include <sys/sdt.h>
  33 #include <sys/time.h>
  34
  35 SDT_PROVIDER_DEFINE(lockstat);
  36
  37 SDT_PROBE_DEFINE1(lockstat, , , adaptive__acquire, "struct mtx *");
  38 SDT_PROBE_DEFINE1(lockstat, , , adaptive__release, "struct mtx *");
  39 SDT_PROBE_DEFINE2(lockstat, , , adaptive__spin, "struct mtx *", "uint64_t");
  40 SDT_PROBE_DEFINE2(lockstat, , , adaptive__block, "struct mtx *", "uint64_t");
  41
  42 SDT_PROBE_DEFINE1(lockstat, , , spin__acquire, "struct mtx *");
  43 SDT_PROBE_DEFINE1(lockstat, , , spin__release, "struct mtx *");
  44 SDT_PROBE_DEFINE2(lockstat, , , spin__spin, "struct mtx *", "uint64_t");
  45
  46 SDT_PROBE_DEFINE2(lockstat, , , rw__acquire, "struct rwlock *", "int");
  47 SDT_PROBE_DEFINE2(lockstat, , , rw__release, "struct rwlock *", "int");
  48 SDT_PROBE_DEFINE5(lockstat, , , rw__block, "struct rwlock *", "uint64_t", "int",
  49     "int", "int");
  50 SDT_PROBE_DEFINE2(lockstat, , , rw__spin, "struct rwlock *", "uint64_t");
  51 SDT_PROBE_DEFINE1(lockstat, , , rw__upgrade, "struct rwlock *");
  52 SDT_PROBE_DEFINE1(lockstat, , , rw__downgrade, "struct rwlock *");
  53
  54 SDT_PROBE_DEFINE2(lockstat, , , sx__acquire, "struct sx *", "int");
  55 SDT_PROBE_DEFINE2(lockstat, , , sx__release, "struct sx *", "int");
  56 SDT_PROBE_DEFINE5(lockstat, , , sx__block, "struct sx *", "uint64_t", "int",
  57     "int", "int");
  58 SDT_PROBE_DEFINE2(lockstat, , , sx__spin, "struct sx *", "uint64_t");
  59 SDT_PROBE_DEFINE1(lockstat, , , sx__upgrade, "struct sx *");
  60 SDT_PROBE_DEFINE1(lockstat, , , sx__downgrade, "struct sx *");
  61
  62 SDT_PROBE_DEFINE2(lockstat, , , thread__spin, "struct mtx *", "uint64_t");
  63
  64 int lockstat_enabled = 0;
  65
  66 uint64_t
  67 lockstat_nsecs(struct lock_object *lo)
  68 {
  69         struct bintime bt;
  70         uint64_t ns;
  71
  72         if (!lockstat_enabled)
  73                 return (0);
  74         if ((lo->lo_flags & LO_NOPROFILE) != 0)
  75                 return (0);
  76
  77         binuptime(&bt);
  78         ns = bt.sec * (uint64_t)1000000000;
  79         ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
  80         return (ns);
  81 }