1 /* 2 * Copyright (c) 1980, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.c 8.2 (Berkeley) 1/21/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/socket.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/file.h> 47 #include <sys/callout.h> 48 #include <sys/clist.h> 49 #include <sys/mbuf.h> 50 #include <sys/kernel.h> 51 52 #include <ufs/ufs/quota.h> 53 54 #ifdef SYSVSHM 55 #include <machine/vmparam.h> 56 #include <sys/shm.h> 57 #endif 58 59 /* 60 * System parameter formulae. 61 * 62 * This file is copied into each directory where we compile 63 * the kernel; it should be modified there to suit local taste 64 * if necessary. 65 * 66 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 67 */ 68 69 #ifndef HZ 70 #define HZ 100 71 #endif 72 int hz = HZ; 73 int tick = 1000000 / HZ; 74 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 75 struct timezone tz = { TIMEZONE, DST }; 76 #define NPROC (20 + 16 * MAXUSERS) 77 int maxproc = NPROC; 78 #define NTEXT NPROC 79 int vm_cache_max = NTEXT/2 + 16; 80 #define NVNODE (NPROC + NTEXT + 100) 81 int desiredvnodes = NVNODE; 82 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 83 int ncallout = 16 + NPROC; 84 int nclist = 60 + 12 * MAXUSERS; 85 int nmbclusters = NMBCLUSTERS; 86 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 87 88 /* 89 * Values in support of System V compatible shared memory. XXX 90 */ 91 #ifdef SYSVSHM 92 #define SHMMAX (SHMMAXPGS*NBPG) 93 #define SHMMIN 1 94 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 95 #define SHMSEG 8 96 #define SHMALL (SHMMAXPGS/CLSIZE) 97 98 struct shminfo shminfo = { 99 SHMMAX, 100 SHMMIN, 101 SHMMNI, 102 SHMSEG, 103 SHMALL 104 }; 105 #endif 106 107 /* 108 * These are initialized at bootstrap time 109 * to values dependent on memory size 110 */ 111 int nbuf, nswbuf; 112 113 /* 114 * These have to be allocated somewhere; allocating 115 * them here forces loader errors if this file is omitted 116 * (if they've been externed everywhere else; hah!). 117 */ 118 struct callout *callout; 119 struct cblock *cfree; 120 struct buf *buf, *swbuf; 121 char *buffers; 122 123 /* 124 * Proc/pgrp hashing. 125 * Here so that hash table sizes can depend on MAXUSERS/NPROC. 126 * Hash size must be a power of two. 127 * NOW omission of this file will cause loader errors! 128 */ 129 130 #if NPROC > 1024 131 #define PIDHSZ 512 132 #else 133 #if NPROC > 512 134 #define PIDHSZ 256 135 #else 136 #if NPROC > 256 137 #define PIDHSZ 128 138 #else 139 #define PIDHSZ 64 140 #endif 141 #endif 142 #endif 143 144 struct proc *pidhash[PIDHSZ]; 145 struct pgrp *pgrphash[PIDHSZ]; 146 int pidhashmask = PIDHSZ - 1; 147