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 1.11 1995/06/29 08:21:32 davidg 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 -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 #define NPROC (20 + 16 * MAXUSERS) 83 int maxproc = NPROC; /* maximum # of processes */ 84 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 85 int maxfiles = NPROC*2; /* system wide open files limit */ 86 int maxfilesperproc = NPROC*2; /* per-process open files limit */ 87 int ncallout = 16 + NPROC; /* maximum # of timer events */ 88 89 /* maximum # of mbuf clusters */ 90 #ifndef NMBCLUSTERS 91 int nmbclusters = 512 + MAXUSERS * 16; 92 #else 93 int nmbclusters = NMBCLUSTERS; 94 #endif 95 96 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 97 98 /* 99 * Values in support of System V compatible shared memory. XXX 100 */ 101 #ifdef SYSVSHM 102 #ifndef SHMMAX 103 #define SHMMAX (SHMMAXPGS*NBPG) 104 #endif 105 #ifndef SHMMIN 106 #define SHMMIN 1 107 #endif 108 #ifndef SHMMNI 109 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 110 #endif 111 #ifndef SHMSEG 112 #define SHMSEG 8 113 #endif 114 #ifndef SHMALL 115 #define SHMALL (SHMMAXPGS/CLSIZE) 116 #endif 117 118 struct shminfo shminfo = { 119 SHMMAX, 120 SHMMIN, 121 SHMMNI, 122 SHMSEG, 123 SHMALL 124 }; 125 #endif 126 127 /* 128 * Values in support of System V compatible semaphores. 129 */ 130 131 #ifdef SYSVSEM 132 133 struct seminfo seminfo = { 134 SEMMAP, /* # of entries in semaphore map */ 135 SEMMNI, /* # of semaphore identifiers */ 136 SEMMNS, /* # of semaphores in system */ 137 SEMMNU, /* # of undo structures in system */ 138 SEMMSL, /* max # of semaphores per id */ 139 SEMOPM, /* max # of operations per semop call */ 140 SEMUME, /* max # of undo entries per process */ 141 SEMUSZ, /* size in bytes of undo structure */ 142 SEMVMX, /* semaphore maximum value */ 143 SEMAEM /* adjust on exit max value */ 144 }; 145 #endif 146 147 /* 148 * Values in support of System V compatible messages. 149 */ 150 151 #ifdef SYSVMSG 152 153 struct msginfo msginfo = { 154 MSGMAX, /* max chars in a message */ 155 MSGMNI, /* # of message queue identifiers */ 156 MSGMNB, /* max chars in a queue */ 157 MSGTQL, /* max messages in system */ 158 MSGSSZ, /* size of a message segment */ 159 /* (must be small power of 2 greater than 4) */ 160 MSGSEG /* number of message segments */ 161 }; 162 #endif 163 164 /* 165 * These may be set to nonzero here or by patching. 166 * If they are nonzero at bootstrap time then they are 167 * initialized to values dependent on the memory size. 168 */ 169 #ifdef NBUF 170 int nbuf = NBUF; 171 #else 172 int nbuf = 0; 173 #endif 174 int nswbuf = 0; 175 176 /* 177 * These have to be allocated somewhere; allocating 178 * them here forces loader errors if this file is omitted 179 * (if they've been externed everywhere else; hah!). 180 */ 181 struct cblock *cfree; 182 struct 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