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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright 2008-2009 Stacey Son <sson@FreeBSD.org>
      *
      * 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 AUTHOR AND CONTRIBUTORS ``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 SHALL AUTHOR OR CONTRIBUTORS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_lockstat.c 332900 2018-04-24 01:04:10Z mjg $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/lock.h>
    #include <sys/lockstat.h>
    #include <sys/sdt.h>
    #include <sys/time.h>
    
    SDT_PROVIDER_DEFINE(lockstat);
    
    SDT_PROBE_DEFINE1(lockstat, , , adaptive__acquire, "struct mtx *");
    SDT_PROBE_DEFINE1(lockstat, , , adaptive__release, "struct mtx *");
    SDT_PROBE_DEFINE2(lockstat, , , adaptive__spin, "struct mtx *", "uint64_t");
    SDT_PROBE_DEFINE2(lockstat, , , adaptive__block, "struct mtx *", "uint64_t");
    
    SDT_PROBE_DEFINE1(lockstat, , , spin__acquire, "struct mtx *");
    SDT_PROBE_DEFINE1(lockstat, , , spin__release, "struct mtx *");
    SDT_PROBE_DEFINE2(lockstat, , , spin__spin, "struct mtx *", "uint64_t");
    
    SDT_PROBE_DEFINE2(lockstat, , , rw__acquire, "struct rwlock *", "int");
    SDT_PROBE_DEFINE2(lockstat, , , rw__release, "struct rwlock *", "int");
    SDT_PROBE_DEFINE5(lockstat, , , rw__block, "struct rwlock *", "uint64_t", "int",
        "int", "int");
    SDT_PROBE_DEFINE2(lockstat, , , rw__spin, "struct rwlock *", "uint64_t");
    SDT_PROBE_DEFINE1(lockstat, , , rw__upgrade, "struct rwlock *");
    SDT_PROBE_DEFINE1(lockstat, , , rw__downgrade, "struct rwlock *");
    
    SDT_PROBE_DEFINE2(lockstat, , , sx__acquire, "struct sx *", "int");
    SDT_PROBE_DEFINE2(lockstat, , , sx__release, "struct sx *", "int");
    SDT_PROBE_DEFINE5(lockstat, , , sx__block, "struct sx *", "uint64_t", "int",
        "int", "int");
    SDT_PROBE_DEFINE2(lockstat, , , sx__spin, "struct sx *", "uint64_t");
    SDT_PROBE_DEFINE1(lockstat, , , sx__upgrade, "struct sx *");
    SDT_PROBE_DEFINE1(lockstat, , , sx__downgrade, "struct sx *");
    
    SDT_PROBE_DEFINE2(lockstat, , , thread__spin, "struct mtx *", "uint64_t");
    
    volatile bool __read_frequently lockstat_enabled;
    
    uint64_t 
    lockstat_nsecs(struct lock_object *lo)
    {
            struct bintime bt;
            uint64_t ns;
    
            if (!lockstat_enabled)
                    return (0);
            if ((lo->lo_flags & LO_NOPROFILE) != 0)
                    return (0);
    
            binuptime(&bt);
            ns = bt.sec * (uint64_t)1000000000;
            ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
            return (ns);
    }

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