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_dtrace.c

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    1 /*-
    2  * Copyright (c) 2007-2008 John Birrell <jb@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.3/sys/kern/kern_dtrace.c 219107 2011-02-28 23:28:35Z rwatson $");
   29 
   30 #include "opt_kdb.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/kdb.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/proc.h>
   39 #include <sys/dtrace_bsd.h>
   40 
   41 #define KDTRACE_PROC_SIZE       64
   42 #define KDTRACE_THREAD_SIZE     256
   43 
   44 MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
   45 
   46 /* Return the DTrace process data size compiled in the kernel hooks. */
   47 size_t
   48 kdtrace_proc_size()
   49 {
   50 
   51         return (KDTRACE_PROC_SIZE);
   52 }
   53 
   54 static void
   55 kdtrace_proc_ctor(void *arg __unused, struct proc *p)
   56 {
   57 
   58         p->p_dtrace = malloc(KDTRACE_PROC_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
   59 }
   60 
   61 static void
   62 kdtrace_proc_dtor(void *arg __unused, struct proc *p)
   63 {
   64 
   65         if (p->p_dtrace != NULL) {
   66                 free(p->p_dtrace, M_KDTRACE);
   67                 p->p_dtrace = NULL;
   68         }
   69 }
   70 
   71 /* Return the DTrace thread data size compiled in the kernel hooks. */
   72 size_t
   73 kdtrace_thread_size()
   74 {
   75 
   76         return (KDTRACE_THREAD_SIZE);
   77 }
   78 
   79 static void
   80 kdtrace_thread_ctor(void *arg __unused, struct thread *td)
   81 {
   82 
   83         td->td_dtrace = malloc(KDTRACE_THREAD_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
   84 }
   85 
   86 static void
   87 kdtrace_thread_dtor(void *arg __unused, struct thread *td)
   88 {
   89 
   90         if (td->td_dtrace != NULL) {
   91                 free(td->td_dtrace, M_KDTRACE);
   92                 td->td_dtrace = NULL;
   93         }
   94 }
   95 
   96 /*
   97  *  Initialise the kernel DTrace hooks.
   98  */
   99 static void
  100 init_dtrace(void *dummy __unused)
  101 {
  102 
  103         EVENTHANDLER_REGISTER(process_ctor, kdtrace_proc_ctor, NULL,
  104             EVENTHANDLER_PRI_ANY);
  105         EVENTHANDLER_REGISTER(process_dtor, kdtrace_proc_dtor, NULL,
  106             EVENTHANDLER_PRI_ANY);
  107         EVENTHANDLER_REGISTER(thread_ctor, kdtrace_thread_ctor, NULL,
  108             EVENTHANDLER_PRI_ANY);
  109         EVENTHANDLER_REGISTER(thread_dtor, kdtrace_thread_dtor, NULL,
  110             EVENTHANDLER_PRI_ANY);
  111 }
  112 
  113 SYSINIT(kdtrace, SI_SUB_KDTRACE, SI_ORDER_FIRST, init_dtrace, NULL);

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