FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c

     /*
      * Copyright (c) 1980, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
     *
     *      @(#)param.c     8.3 (Berkeley) 8/20/94
     * $FreeBSD$
     */
    
    #include <stddef.h>
    
    #include "opt_sysvipc.h"
    #include "opt_param.h"
    
    #include <sys/param.h>
    
    #ifdef SYSVSHM
    #include <machine/vmparam.h>
    #include <sys/shm.h>
    #endif
    #ifdef SYSVSEM
    #include <sys/sem.h>
    #endif
    #ifdef SYSVMSG
    #include <sys/msg.h>
    #endif
    
    /*
     * System parameter formulae.
     *
     * This file is copied into each directory where we compile
     * the kernel; it should be modified there to suit local taste
     * if necessary.
     *
     * Compiled with -DMAXUSERS=xx
     */
    
    #ifndef HZ
    #define HZ 100
    #endif
    int     hz = HZ;
    int     tick = 1000000 / HZ;
    int     tickadj = howmany(30000, 60 * HZ);      /* can adjust 30ms in 60s */
    #define NPROC (20 + 16 * MAXUSERS)
    #ifndef MAXFILES
    #define MAXFILES (NPROC*2)
    #endif
    int     maxproc = NPROC;                        /* maximum # of processes */
    int     maxprocperuid = NPROC-1;                /* maximum # of processes per user */
    int     maxfiles = MAXFILES;                    /* system wide open files limit */
    int     maxfilesperproc = MAXFILES;             /* per-process open files limit */
    int     ncallout = 16 + NPROC + MAXFILES;       /* maximum # of timer events */
    int     mbuf_wait = 32;                         /* mbuf sleep time */
    
    /* maximum # of mbuf clusters */
    #ifndef NMBCLUSTERS
    #define NMBCLUSTERS (512 + MAXUSERS * 16)
    #endif
    int     nmbclusters = NMBCLUSTERS;
    
    #if MAXFILES > NMBCLUSTERS
    #define MAXSOCKETS MAXFILES
    #else
    #define MAXSOCKETS NMBCLUSTERS
    #endif
    int     maxsockets = MAXSOCKETS;
    
   /* allocate 1/4th amount of virtual address space for mbufs XXX */
   int     nmbufs = NMBCLUSTERS * 4;
   
   /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */
   #ifndef NSFBUFS
   #define NSFBUFS (512 + MAXUSERS * 16)
   #endif
   int     nsfbufs = NSFBUFS;
   
   /*
    * Values in support of System V compatible shared memory.      XXX
    */
   #ifdef SYSVSHM
   #ifndef SHMMAX
   #define SHMMAX  (SHMMAXPGS*PAGE_SIZE)
   #endif
   #ifndef SHMMIN
   #define SHMMIN  1
   #endif
   #ifndef SHMMNI
   #define SHMMNI  32                      /* <= SHMMMNI in shm.h */
   #endif
   #ifndef SHMSEG
   #define SHMSEG  8
   #endif
   #ifndef SHMALL
   #define SHMALL  (SHMMAXPGS)
   #endif
   
   struct  shminfo shminfo = {
           SHMMAX,
           SHMMIN,
           SHMMNI,
           SHMSEG,
           SHMALL
   };
   #endif
   
   /*
    * Values in support of System V compatible semaphores.
    */
   
   #ifdef SYSVSEM
   
   struct seminfo seminfo = {
                   SEMMAP,         /* # of entries in semaphore map */
                   SEMMNI,         /* # of semaphore identifiers */
                   SEMMNS,         /* # of semaphores in system */
                   SEMMNU,         /* # of undo structures in system */
                   SEMMSL,         /* max # of semaphores per id */
                   SEMOPM,         /* max # of operations per semop call */
                   SEMUME,         /* max # of undo entries per process */
                   SEMUSZ,         /* size in bytes of undo structure */
                   SEMVMX,         /* semaphore maximum value */
                   SEMAEM          /* adjust on exit max value */
   };
   #endif
   
   /*
    * Values in support of System V compatible messages.
    */
   
   #ifdef SYSVMSG
   
   struct msginfo msginfo = {
                   MSGMAX,         /* max chars in a message */
                   MSGMNI,         /* # of message queue identifiers */
                   MSGMNB,         /* max chars in a queue */
                   MSGTQL,         /* max messages in system */
                   MSGSSZ,         /* size of a message segment */
                                   /* (must be small power of 2 greater than 4) */
                   MSGSEG          /* number of message segments */
   };
   #endif
   
   /*
    * These may be set to nonzero here or by patching.
    * If they are nonzero at bootstrap time then they are
    * initialized to values dependent on the memory size.
    */
   #ifdef  NBUF
   int     nbuf = NBUF;
   #else
   int     nbuf = 0;
   #endif
   int     nswbuf = 0;
   
   /*
    * These have to be allocated somewhere; allocating
    * them here forces loader errors if this file is omitted
    * (if they've been externed everywhere else; hah!).
    */
   struct  buf *swbuf;

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