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/conf/param.c

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    1 /*      $NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $      */
    2 
    3 /*
    4  * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
    5  * All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)param.c     7.20 (Berkeley) 6/27/91
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $");
   41 
   42 #include "opt_hz.h"
   43 #include "opt_rtc_offset.h"
   44 #include "opt_sysv.h"
   45 #include "opt_sysvparam.h"
   46 #include "opt_nmbclusters.h"
   47 #include "opt_multiprocessor.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/socket.h>
   52 #include <sys/socketvar.h>
   53 #include <sys/proc.h>
   54 #include <sys/vnode.h>
   55 #include <sys/file.h>
   56 #include <sys/callout.h>
   57 #include <sys/mbuf.h>
   58 #include <ufs/ufs/quota.h>
   59 #include <sys/kernel.h>
   60 #include <sys/utsname.h>
   61 #ifdef SYSVSHM
   62 #include <machine/vmparam.h>
   63 #include <sys/shm.h>
   64 #endif
   65 #ifdef SYSVSEM
   66 #include <sys/sem.h>
   67 #endif
   68 #ifdef SYSVMSG
   69 #include <sys/msg.h>
   70 #endif
   71 
   72 /*
   73  * PCC cannot handle the 80KB string literal.
   74  */
   75 #if !defined(__PCC__)
   76 #define CONFIG_FILE
   77 #include "config_file.h"
   78 #endif
   79 
   80 /*
   81  * System parameter formulae.
   82  *
   83  * This file is copied into each directory where we compile
   84  * the kernel; it should be modified there to suit local taste
   85  * if necessary.
   86  *
   87  * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
   88  */
   89 
   90 #ifdef TIMEZONE
   91 #error TIMEZONE is an obsolete kernel option.
   92 #endif
   93 
   94 #ifdef DST
   95 #error DST is an obsolete kernel option.
   96 #endif
   97 
   98 #ifndef RTC_OFFSET
   99 #define RTC_OFFSET 0
  100 #endif
  101 
  102 #ifndef HZ
  103 #define HZ 100
  104 #endif
  105 
  106 #ifndef MAXFILES
  107 #define MAXFILES        (3 * (NPROC + MAXUSERS) + 80)
  108 #endif
  109 
  110 #ifndef MAXEXEC
  111 #define MAXEXEC         16
  112 #endif
  113 
  114 int     hz = HZ;
  115 int     tick = 1000000 / HZ;
  116 /* can adjust 240ms in 60s */
  117 int     tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
  118 int     rtc_offset = RTC_OFFSET;
  119 int     maxproc = NPROC;
  120 int     desiredvnodes = NVNODE;
  121 u_int   maxfiles = MAXFILES;
  122 int     fscale = FSCALE;        /* kernel uses `FSCALE', user uses `fscale' */
  123 int     maxexec = MAXEXEC;      /* max number of concurrent exec() calls */
  124 
  125 #ifdef MULTIPROCESSOR
  126 u_int   maxcpus = MAXCPUS;
  127 size_t  coherency_unit = COHERENCY_UNIT;
  128 #else
  129 u_int   maxcpus = 1;
  130 size_t  coherency_unit = ALIGNBYTES + 1;
  131 #endif
  132 
  133 /*
  134  * Various mbuf-related parameters.  These can also be changed at run-time
  135  * with sysctl.
  136  */
  137 int     nmbclusters = NMBCLUSTERS;
  138 
  139 #ifndef MBLOWAT
  140 #define MBLOWAT         16
  141 #endif
  142 int     mblowat = MBLOWAT;
  143 
  144 #ifndef MCLLOWAT
  145 #define MCLLOWAT        8
  146 #endif
  147 int     mcllowat = MCLLOWAT;
  148 
  149 /*
  150  * Values in support of System V compatible shared memory.      XXX
  151  */
  152 #ifdef SYSVSHM
  153 #ifndef SHMMAX
  154 #define SHMMAX  SHMMAXPGS       /* shminit() performs a `*= PAGE_SIZE' */
  155 #endif
  156 #ifndef SHMMIN
  157 #define SHMMIN  1
  158 #endif
  159 #ifndef SHMMNI
  160 #define SHMMNI  128             /* <64k, see IPCID_TO_IX in ipc.h */
  161 #endif
  162 #ifndef SHMSEG
  163 #define SHMSEG  128
  164 #endif
  165 #define SHMALL  SHMMAXPGS
  166 
  167 struct  shminfo shminfo = {
  168         SHMMAX,
  169         SHMMIN,
  170         SHMMNI,
  171         SHMSEG,
  172         SHMALL
  173 };
  174 #endif
  175 
  176 /*
  177  * Values in support of System V compatible semaphores.
  178  */
  179 #ifdef SYSVSEM
  180 struct  seminfo seminfo = {
  181         SEMMAP,         /* # of entries in semaphore map */
  182         SEMMNI,         /* # of semaphore identifiers */
  183         SEMMNS,         /* # of semaphores in system */
  184         SEMMNU,         /* # of undo structures in system */
  185         SEMMSL,         /* max # of semaphores per id */
  186         SEMOPM,         /* max # of operations per semop call */
  187         SEMUME,         /* max # of undo entries per process */
  188         SEMUSZ,         /* size in bytes of undo structure */
  189         SEMVMX,         /* semaphore maximum value */
  190         SEMAEM          /* adjust on exit max value */
  191 };
  192 #endif
  193 
  194 /*
  195  * Values in support of System V compatible messages.
  196  */
  197 #ifdef SYSVMSG
  198 struct  msginfo msginfo = {
  199         MSGMAX,         /* max chars in a message */
  200         MSGMNI,         /* # of message queue identifiers */
  201         MSGMNB,         /* max chars in a queue */
  202         MSGTQL,         /* max messages in system */
  203         MSGSSZ,         /* size of a message segment */
  204                         /* (must be small power of 2 greater than 4) */
  205         MSGSEG          /* number of message segments */
  206 };
  207 #endif
  208 
  209 /*
  210  * Actual network mbuf sizes (read-only), for netstat.
  211  */
  212 const   int msize = MSIZE;
  213 const   int mclbytes = MCLBYTES;

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