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/subr_evcnt.c

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    1 /* $NetBSD: subr_evcnt.c,v 1.2 2004/02/17 08:22:12 tron Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1996, 2000 Christopher G. Demetriou
    5  * All rights reserved.
    6  * 
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *          This product includes software developed for the
   18  *          NetBSD Project.  See http://www.NetBSD.org/ for
   19  *          information about NetBSD.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  * 
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  * 
   34  * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
   35  */
   36 
   37 /*
   38  * Copyright (c) 1992, 1993
   39  *      The Regents of the University of California.  All rights reserved.
   40  *
   41  * This software was developed by the Computer Systems Engineering group
   42  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   43  * contributed to Berkeley.
   44  *
   45  * All advertising materials mentioning features or use of this software
   46  * must display the following acknowledgement:
   47  *      This product includes software developed by the University of
   48  *      California, Lawrence Berkeley Laboratories.
   49  *
   50  * Redistribution and use in source and binary forms, with or without
   51  * modification, are permitted provided that the following conditions
   52  * are met:
   53  * 1. Redistributions of source code must retain the above copyright
   54  *    notice, this list of conditions and the following disclaimer.
   55  * 2. Redistributions in binary form must reproduce the above copyright
   56  *    notice, this list of conditions and the following disclaimer in the
   57  *    documentation and/or other materials provided with the distribution.
   58  * 3. Neither the name of the University nor the names of its contributors
   59  *    may be used to endorse or promote products derived from this software
   60  *    without specific prior written permission.
   61  *
   62  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   63  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   64  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   65  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   66  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   67  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   68  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   69  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   70  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   71  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   72  * SUCH DAMAGE.
   73  *
   74  * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp  (LBL)
   75  *
   76  *      @(#)subr_autoconf.c     8.3 (Berkeley) 5/17/94
   77  */
   78 
   79 #include <sys/cdefs.h>
   80 __KERNEL_RCSID(0, "$NetBSD: subr_evcnt.c,v 1.2 2004/02/17 08:22:12 tron Exp $");
   81 
   82 #include "opt_ddb.h"
   83 
   84 #include <sys/param.h>
   85 #include <sys/device.h>
   86 #include <sys/systm.h>
   87 
   88 /* list of all events */
   89 struct evcntlist allevents = TAILQ_HEAD_INITIALIZER(allevents);
   90 
   91 /*
   92  * We need a dummy object to stuff into the evcnt link set to
   93  * ensure that there always is at least one object in the set.
   94  */
   95 static struct evcnt dummy_static_evcnt;
   96 __link_set_add_bss(evcnts, dummy_static_evcnt);
   97 
   98 /*
   99  * Initialize event counters.  This does the attach procedure for
  100  * each of the static event counters in the "evcnts" link set.
  101  */
  102 void
  103 evcnt_init(void)
  104 {
  105         __link_set_decl(evcnts, struct evcnt);
  106         struct evcnt * const *evp;
  107 
  108         __link_set_foreach(evp, evcnts) {
  109                 if (*evp == &dummy_static_evcnt)
  110                         continue;
  111                 evcnt_attach_static(*evp);
  112         }
  113 }
  114 
  115 /*
  116  * Attach a statically-initialized event.  The type and string pointers
  117  * are already set up.
  118  */
  119 void
  120 evcnt_attach_static(struct evcnt *ev)
  121 {
  122         int len;
  123 
  124         len = strlen(ev->ev_group);
  125 #ifdef DIAGNOSTIC
  126         if (len >= EVCNT_STRING_MAX)            /* ..._MAX includes NUL */
  127                 panic("evcnt_attach_static: group length (%s)", ev->ev_group);
  128 #endif
  129         ev->ev_grouplen = len;
  130 
  131         len = strlen(ev->ev_name);
  132 #ifdef DIAGNOSTIC
  133         if (len >= EVCNT_STRING_MAX)            /* ..._MAX includes NUL */
  134                 panic("evcnt_attach_static: name length (%s)", ev->ev_name);
  135 #endif
  136         ev->ev_namelen = len;
  137 
  138         TAILQ_INSERT_TAIL(&allevents, ev, ev_list);
  139 }
  140 
  141 /*
  142  * Attach a dynamically-initialized event.  Zero it, set up the type
  143  * and string pointers and then act like it was statically initialized.
  144  */
  145 void
  146 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent,
  147     const char *group, const char *name)
  148 {
  149 
  150         memset(ev, 0, sizeof *ev);
  151         ev->ev_type = type;
  152         ev->ev_parent = parent;
  153         ev->ev_group = group;
  154         ev->ev_name = name;
  155         evcnt_attach_static(ev);
  156 }
  157 
  158 /*
  159  * Detach an event.
  160  */
  161 void
  162 evcnt_detach(struct evcnt *ev)
  163 {
  164 
  165         TAILQ_REMOVE(&allevents, ev, ev_list);
  166 }
  167 
  168 #ifdef DDB
  169 void
  170 event_print(int full, void (*pr)(const char *, ...))
  171 {
  172         struct evcnt *evp;
  173 
  174         TAILQ_FOREACH(evp, &allevents, ev_list) {
  175                 if (evp->ev_count == 0 && !full)
  176                         continue;
  177 
  178                 (*pr)("evcnt type %d: %s %s = %lld\n", evp->ev_type,
  179                     evp->ev_group, evp->ev_name, evp->ev_count);
  180         }
  181 }
  182 #endif /* DDB */

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