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 8.3 (Berkeley) 8/20/94 39 * $Id: param.c,v 1.19 1996/05/10 19:28:32 wollman Exp $ 40 */ 41 42 #include "opt_sysvipc.h" 43 #include "opt_param.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/socket.h> 48 #include <sys/proc.h> 49 #include <sys/vnode.h> 50 #include <sys/file.h> 51 #include <sys/callout.h> 52 #include <sys/clist.h> 53 #include <sys/mbuf.h> 54 #include <sys/kernel.h> 55 56 #include <ufs/ufs/quota.h> 57 58 #ifdef SYSVSHM 59 #include <machine/vmparam.h> 60 #include <sys/shm.h> 61 #endif 62 #ifdef SYSVSEM 63 #include <sys/sem.h> 64 #endif 65 #ifdef SYSVMSG 66 #include <sys/msg.h> 67 #endif 68 69 /* 70 * System parameter formulae. 71 * 72 * This file is copied into each directory where we compile 73 * the kernel; it should be modified there to suit local taste 74 * if necessary. 75 * 76 * Compiled with -DMAXUSERS=xx 77 */ 78 79 #ifndef HZ 80 #define HZ 100 81 #endif 82 int hz = HZ; 83 int tick = 1000000 / HZ; 84 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 85 #define NPROC (20 + 16 * MAXUSERS) 86 int maxproc = NPROC; /* maximum # of processes */ 87 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 88 int maxfiles = NPROC*2; /* system wide open files limit */ 89 int maxfilesperproc = NPROC*2; /* per-process open files limit */ 90 int ncallout = 16 + NPROC; /* maximum # of timer events */ 91 92 #ifndef EXTRAVNODES 93 #define EXTRAVNODES 0 94 #endif 95 int extravnodes = EXTRAVNODES; /* spare vnodes to allocate */ 96 97 /* maximum # of mbuf clusters */ 98 #ifndef NMBCLUSTERS 99 #define NMBCLUSTERS (512 + MAXUSERS * 16) 100 #endif 101 int nmbclusters = NMBCLUSTERS; 102 103 /* allocate same amount of virtual address space for mbufs XXX */ 104 int nmbufs = NMBCLUSTERS * (MCLBYTES / MSIZE); 105 106 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 107 108 /* 109 * Values in support of System V compatible shared memory. XXX 110 */ 111 #ifdef SYSVSHM 112 #ifndef SHMMAX 113 #define SHMMAX (SHMMAXPGS*PAGE_SIZE) 114 #endif 115 #ifndef SHMMIN 116 #define SHMMIN 1 117 #endif 118 #ifndef SHMMNI 119 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 120 #endif 121 #ifndef SHMSEG 122 #define SHMSEG 8 123 #endif 124 #ifndef SHMALL 125 #define SHMALL (SHMMAXPGS) 126 #endif 127 128 struct shminfo shminfo = { 129 SHMMAX, 130 SHMMIN, 131 SHMMNI, 132 SHMSEG, 133 SHMALL 134 }; 135 #endif 136 137 /* 138 * Values in support of System V compatible semaphores. 139 */ 140 141 #ifdef SYSVSEM 142 143 struct seminfo seminfo = { 144 SEMMAP, /* # of entries in semaphore map */ 145 SEMMNI, /* # of semaphore identifiers */ 146 SEMMNS, /* # of semaphores in system */ 147 SEMMNU, /* # of undo structures in system */ 148 SEMMSL, /* max # of semaphores per id */ 149 SEMOPM, /* max # of operations per semop call */ 150 SEMUME, /* max # of undo entries per process */ 151 SEMUSZ, /* size in bytes of undo structure */ 152 SEMVMX, /* semaphore maximum value */ 153 SEMAEM /* adjust on exit max value */ 154 }; 155 #endif 156 157 /* 158 * Values in support of System V compatible messages. 159 */ 160 161 #ifdef SYSVMSG 162 163 struct msginfo msginfo = { 164 MSGMAX, /* max chars in a message */ 165 MSGMNI, /* # of message queue identifiers */ 166 MSGMNB, /* max chars in a queue */ 167 MSGTQL, /* max messages in system */ 168 MSGSSZ, /* size of a message segment */ 169 /* (must be small power of 2 greater than 4) */ 170 MSGSEG /* number of message segments */ 171 }; 172 #endif 173 174 /* 175 * These may be set to nonzero here or by patching. 176 * If they are nonzero at bootstrap time then they are 177 * initialized to values dependent on the memory size. 178 */ 179 #ifdef NBUF 180 int nbuf = NBUF; 181 #else 182 int nbuf = 0; 183 #endif 184 int nswbuf = 0; 185 186 /* 187 * These have to be allocated somewhere; allocating 188 * them here forces loader errors if this file is omitted 189 * (if they've been externed everywhere else; hah!). 190 */ 191 struct buf *swbuf; 192