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  * $FreeBSD: stable/10/sys/kern/kern_lockstat.c 285759 2015-07-21 17:16:37Z markj $
   26  */
   27 
   28 /*
   29  * Backend for the lock tracing (lockstat) kernel support. This is required 
   30  * to allow a module to load even though DTrace kernel support may not be 
   31  * present. 
   32  *
   33  */
   34 
   35 #include "opt_kdtrace.h"
   36 
   37 #ifdef KDTRACE_HOOKS
   38 
   39 #include <sys/types.h>
   40 #include <sys/lock.h>
   41 #include <sys/lockstat.h>
   42 #include <sys/time.h>
   43 
   44 /*
   45  * The following must match the type definition of dtrace_probe.  It is  
   46  * defined this way to avoid having to rely on CDDL code.
   47  */
   48 uint32_t lockstat_probemap[LS_NPROBES];
   49 void (*lockstat_probe_func)(uint32_t, uintptr_t, uintptr_t,
   50     uintptr_t, uintptr_t, uintptr_t);
   51 int lockstat_enabled = 0;
   52 
   53 uint64_t 
   54 lockstat_nsecs(struct lock_object *lo)
   55 {
   56         struct bintime bt;
   57         uint64_t ns;
   58 
   59         if (!lockstat_enabled)
   60                 return (0);
   61         if ((lo->lo_flags & LO_NOPROFILE) != 0)
   62                 return (0);
   63 
   64         binuptime(&bt);
   65         ns = bt.sec * (uint64_t)1000000000;
   66         ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
   67         return (ns);
   68 }
   69 
   70 #endif /* KDTRACE_HOOKS */

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