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Annotation of Net2/conf/param.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
        !             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:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)param.c     7.20 (Berkeley) 6/27/91
        !            34:  */
        !            35: 
        !            36: #include "sys/param.h"
        !            37: #include "sys/systm.h"
        !            38: #include "sys/socket.h"
        !            39: #include "sys/proc.h"
        !            40: #include "sys/vnode.h"
        !            41: #include "sys/file.h"
        !            42: #include "sys/callout.h"
        !            43: #include "sys/clist.h"
        !            44: #include "sys/mbuf.h"
        !            45: #include "ufs/quota.h"
        !            46: #include "sys/kernel.h"
        !            47: #ifdef SYSVSHM
        !            48: #include "machine/vmparam.h"
        !            49: #include "sys/shm.h"
        !            50: #endif
        !            51: 
        !            52: /*
        !            53:  * System parameter formulae.
        !            54:  *
        !            55:  * This file is copied into each directory where we compile
        !            56:  * the kernel; it should be modified there to suit local taste
        !            57:  * if necessary.
        !            58:  *
        !            59:  * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
        !            60:  */
        !            61: 
        !            62: #ifndef HZ
        !            63: #define        HZ 100
        !            64: #endif
        !            65: int    hz = HZ;
        !            66: int    tick = 1000000 / HZ;
        !            67: int    tickadj = 240000 / (60 * HZ);           /* can adjust 240ms in 60s */
        !            68: struct timezone tz = { TIMEZONE, DST };
        !            69: #define        NPROC (20 + 16 * MAXUSERS)
        !            70: int    maxproc = NPROC;
        !            71: #define        NTEXT (80 + NPROC / 8)                  /* actually the object cache */
        !            72: #define        NVNODE (NPROC + NTEXT + 100)
        !            73: long   desiredvnodes = NVNODE;
        !            74: int    maxfiles = 3 * (NPROC + MAXUSERS) + 80;
        !            75: int    ncallout = 16 + NPROC;
        !            76: int    nclist = 60 + 12 * MAXUSERS;
        !            77: int    nmbclusters = NMBCLUSTERS;
        !            78: int    fscale = FSCALE;        /* kernel uses `FSCALE', user uses `fscale' */
        !            79: 
        !            80: /*
        !            81:  * Values in support of System V compatible shared memory.     XXX
        !            82:  */
        !            83: #ifdef SYSVSHM
        !            84: #define        SHMMAX  (SHMMAXPGS*NBPG)
        !            85: #define        SHMMIN  1
        !            86: #define        SHMMNI  32                      /* <= SHMMMNI in shm.h */
        !            87: #define        SHMSEG  8
        !            88: #define        SHMALL  (SHMMAXPGS/CLSIZE)
        !            89: 
        !            90: struct shminfo shminfo = {
        !            91:        SHMMAX,
        !            92:        SHMMIN,
        !            93:        SHMMNI,
        !            94:        SHMSEG,
        !            95:        SHMALL
        !            96: };
        !            97: #endif
        !            98: 
        !            99: /*
        !           100:  * These are initialized at bootstrap time
        !           101:  * to values dependent on memory size
        !           102:  */
        !           103: int    nbuf, nswbuf;
        !           104: 
        !           105: /*
        !           106:  * These have to be allocated somewhere; allocating
        !           107:  * them here forces loader errors if this file is omitted
        !           108:  * (if they've been externed everywhere else; hah!).
        !           109:  */
        !           110: struct         callout *callout;
        !           111: struct cblock *cfree;
        !           112: struct buf *buf, *swbuf;
        !           113: char   *buffers;
        !           114: 
        !           115: /*
        !           116:  * Proc/pgrp hashing.
        !           117:  * Here so that hash table sizes can depend on MAXUSERS/NPROC.
        !           118:  * Hash size must be a power of two.
        !           119:  * NOW omission of this file will cause loader errors!
        !           120:  */
        !           121: 
        !           122: #if NPROC > 1024
        !           123: #define        PIDHSZ          512
        !           124: #else
        !           125: #if NPROC > 512
        !           126: #define        PIDHSZ          256
        !           127: #else
        !           128: #if NPROC > 256
        !           129: #define        PIDHSZ          128
        !           130: #else
        !           131: #define        PIDHSZ          64
        !           132: #endif
        !           133: #endif
        !           134: #endif
        !           135: 
        !           136: struct proc *pidhash[PIDHSZ];
        !           137: struct pgrp *pgrphash[PIDHSZ];
        !           138: int    pidhashmask = PIDHSZ - 1;

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