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 1.32 1998/12/14 08:34:54 dillon Exp $ 40 */ 41 42 #include <stddef.h> 43 44 #include "opt_sysvipc.h" 45 #include "opt_param.h" 46 47 #include <sys/param.h> 48 49 #ifdef SYSVSHM 50 #include <machine/vmparam.h> 51 #include <sys/shm.h> 52 #endif 53 #ifdef SYSVSEM 54 #include <sys/sem.h> 55 #endif 56 #ifdef SYSVMSG 57 #include <sys/msg.h> 58 #endif 59 60 /* 61 * System parameter formulae. 62 * 63 * This file is copied into each directory where we compile 64 * the kernel; it should be modified there to suit local taste 65 * if necessary. 66 * 67 * Compiled with -DMAXUSERS=xx 68 */ 69 70 #ifndef HZ 71 #define HZ 100 72 #endif 73 int hz = HZ; 74 int tick = 1000000 / HZ; 75 int tickadj = howmany(30000, 60 * HZ); /* can adjust 30ms in 60s */ 76 #define NPROC (20 + 16 * MAXUSERS) 77 #ifndef MAXFILES 78 #define MAXFILES (NPROC*2) 79 #endif 80 int maxproc = NPROC; /* maximum # of processes */ 81 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 82 int maxfiles = MAXFILES; /* system wide open files limit */ 83 int maxfilesperproc = MAXFILES; /* per-process open files limit */ 84 int ncallout = 16 + NPROC + MAXFILES; /* maximum # of timer events */ 85 86 /* maximum # of mbuf clusters */ 87 #ifndef NMBCLUSTERS 88 #define NMBCLUSTERS (512 + MAXUSERS * 16) 89 #endif 90 int nmbclusters = NMBCLUSTERS; 91 92 #if MAXFILES > NMBCLUSTERS 93 #define MAXSOCKETS MAXFILES 94 #else 95 #define MAXSOCKETS NMBCLUSTERS 96 #endif 97 int maxsockets = MAXSOCKETS; 98 99 /* allocate 1/4th amount of virtual address space for mbufs XXX */ 100 int nmbufs = NMBCLUSTERS * 4; 101 102 /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ 103 #ifndef NSFBUFS 104 #define NSFBUFS (512 + MAXUSERS * 16) 105 #endif 106 int nsfbufs = NSFBUFS; 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