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 * $Id: param.c,v 1.8 1995/02/20 19:42:19 guido Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/socket.h> 45 #include <sys/proc.h> 46 #include <sys/vnode.h> 47 #include <sys/file.h> 48 #include <sys/callout.h> 49 #include <sys/clist.h> 50 #include <sys/mbuf.h> 51 #include <sys/kernel.h> 52 53 #include <ufs/ufs/quota.h> 54 55 #ifdef SYSVSHM 56 #include <machine/vmparam.h> 57 #include <sys/shm.h> 58 #endif 59 #ifdef SYSVSEM 60 #include "sys/sem.h" 61 #endif 62 #ifdef SYSVMSG 63 #include "sys/msg.h" 64 #endif 65 66 /* 67 * System parameter formulae. 68 * 69 * This file is copied into each directory where we compile 70 * the kernel; it should be modified there to suit local taste 71 * if necessary. 72 * 73 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 74 */ 75 76 #ifndef HZ 77 #define HZ 100 78 #endif 79 int hz = HZ; 80 int tick = 1000000 / HZ; 81 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 82 struct timezone tz = { TIMEZONE, DST }; 83 #define NPROC (20 + 16 * MAXUSERS) 84 int maxproc = NPROC; /* maximum # of processes */ 85 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 86 int maxfiles = NPROC*2; /* system wide open files limit */ 87 int maxfilesperproc = NPROC*2; /* per-process open files limit */ 88 int ncallout = 16 + NPROC; /* maximum # of timer events */ 89 90 /* maximum # of mbuf clusters */ 91 #ifndef NMBCLUSTERS 92 #ifdef GATEWAY 93 int nmbclusters = 512 + MAXUSERS * 16; 94 #else 95 int nmbclusters = 256 + MAXUSERS * 16; 96 #endif /* GATEWAY */ 97 #else 98 int nmbclusters = NMBCLUSTERS; 99 #endif 100 101 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 102 103 /* 104 * Values in support of System V compatible shared memory. XXX 105 */ 106 #ifdef SYSVSHM 107 #ifndef SHMMAX 108 #define SHMMAX (SHMMAXPGS*NBPG) 109 #endif 110 #ifndef SHMMIN 111 #define SHMMIN 1 112 #endif 113 #ifndef SHMMNI 114 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 115 #endif 116 #ifndef SHMSEG 117 #define SHMSEG 8 118 #endif 119 #ifndef SHMALL 120 #define SHMALL (SHMMAXPGS/CLSIZE) 121 #endif 122 123 struct shminfo shminfo = { 124 SHMMAX, 125 SHMMIN, 126 SHMMNI, 127 SHMSEG, 128 SHMALL 129 }; 130 #endif 131 132 /* 133 * Values in support of System V compatible semaphores. 134 */ 135 136 #ifdef SYSVSEM 137 138 struct seminfo seminfo = { 139 SEMMAP, /* # of entries in semaphore map */ 140 SEMMNI, /* # of semaphore identifiers */ 141 SEMMNS, /* # of semaphores in system */ 142 SEMMNU, /* # of undo structures in system */ 143 SEMMSL, /* max # of semaphores per id */ 144 SEMOPM, /* max # of operations per semop call */ 145 SEMUME, /* max # of undo entries per process */ 146 SEMUSZ, /* size in bytes of undo structure */ 147 SEMVMX, /* semaphore maximum value */ 148 SEMAEM /* adjust on exit max value */ 149 }; 150 #endif 151 152 /* 153 * Values in support of System V compatible messages. 154 */ 155 156 #ifdef SYSVMSG 157 158 struct msginfo msginfo = { 159 MSGMAX, /* max chars in a message */ 160 MSGMNI, /* # of message queue identifiers */ 161 MSGMNB, /* max chars in a queue */ 162 MSGTQL, /* max messages in system */ 163 MSGSSZ, /* size of a message segment */ 164 /* (must be small power of 2 greater than 4) */ 165 MSGSEG /* number of message segments */ 166 }; 167 #endif 168 169 /* 170 * These are initialized at bootstrap time 171 * to values dependent on memory size 172 */ 173 int nbuf, nswbuf; 174 175 /* 176 * These have to be allocated somewhere; allocating 177 * them here forces loader errors if this file is omitted 178 * (if they've been externed everywhere else; hah!). 179 */ 180 struct callout *callout; 181 struct cblock *cfree; 182 struct buf *buf, *swbuf; 183 char *buffers; 184 185 /* 186 * Proc/pgrp hashing. 187 * Here so that hash table sizes can depend on MAXUSERS/NPROC. 188 * Hash size must be a power of two. 189 * NOW omission of this file will cause loader errors! 190 */ 191 192 #if NPROC > 1024 193 #define PIDHSZ 512 194 #else 195 #if NPROC > 512 196 #define PIDHSZ 256 197 #else 198 #if NPROC > 256 199 #define PIDHSZ 128 200 #else 201 #define PIDHSZ 64 202 #endif 203 #endif 204 #endif 205 206 struct proc *pidhash[PIDHSZ]; 207 struct pgrp *pgrphash[PIDHSZ]; 208 int pidhashmask = PIDHSZ - 1; 209