The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_lockstat.c

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    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: releng/11.0/sys/kern/kern_lockstat.c 285704 2015-07-19 22:24:33Z markj $");
   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 }

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