param.c revision 1.58
1 /* $NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 5 * All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)param.c 7.20 (Berkeley) 6/27/91 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $"); 41 42 #include "opt_hz.h" 43 #include "opt_rtc_offset.h" 44 #include "opt_sysv.h" 45 #include "opt_sysvparam.h" 46 #include "opt_nmbclusters.h" 47 #include "opt_multiprocessor.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/proc.h> 54 #include <sys/vnode.h> 55 #include <sys/file.h> 56 #include <sys/callout.h> 57 #include <sys/mbuf.h> 58 #include <ufs/ufs/quota.h> 59 #include <sys/kernel.h> 60 #include <sys/utsname.h> 61 #ifdef SYSVSHM 62 #include <machine/vmparam.h> 63 #include <sys/shm.h> 64 #endif 65 #ifdef SYSVSEM 66 #include <sys/sem.h> 67 #endif 68 #ifdef SYSVMSG 69 #include <sys/msg.h> 70 #endif 71 72 /* 73 * PCC cannot handle the 80KB string literal. 74 */ 75 #if !defined(__PCC__) 76 #define CONFIG_FILE 77 #include "config_file.h" 78 #endif 79 80 /* 81 * System parameter formulae. 82 * 83 * This file is copied into each directory where we compile 84 * the kernel; it should be modified there to suit local taste 85 * if necessary. 86 * 87 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 88 */ 89 90 #ifdef TIMEZONE 91 #error TIMEZONE is an obsolete kernel option. 92 #endif 93 94 #ifdef DST 95 #error DST is an obsolete kernel option. 96 #endif 97 98 #ifndef RTC_OFFSET 99 #define RTC_OFFSET 0 100 #endif 101 102 #ifndef HZ 103 #define HZ 100 104 #endif 105 106 #ifndef MAXFILES 107 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 108 #endif 109 110 #ifndef MAXEXEC 111 #define MAXEXEC 16 112 #endif 113 114 int hz = HZ; 115 int tick = 1000000 / HZ; 116 /* can adjust 240ms in 60s */ 117 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 118 int rtc_offset = RTC_OFFSET; 119 int maxproc = NPROC; 120 int desiredvnodes = NVNODE; 121 u_int maxfiles = MAXFILES; 122 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 123 int maxexec = MAXEXEC; /* max number of concurrent exec() calls */ 124 125 #ifdef MULTIPROCESSOR 126 u_int maxcpus = MAXCPUS; 127 size_t coherency_unit = COHERENCY_UNIT; 128 #else 129 u_int maxcpus = 1; 130 size_t coherency_unit = ALIGNBYTES + 1; 131 #endif 132 133 /* 134 * Various mbuf-related parameters. These can also be changed at run-time 135 * with sysctl. 136 */ 137 int nmbclusters = NMBCLUSTERS; 138 139 #ifndef MBLOWAT 140 #define MBLOWAT 16 141 #endif 142 int mblowat = MBLOWAT; 143 144 #ifndef MCLLOWAT 145 #define MCLLOWAT 8 146 #endif 147 int mcllowat = MCLLOWAT; 148 149 /* 150 * Values in support of System V compatible shared memory. XXX 151 */ 152 #ifdef SYSVSHM 153 #ifndef SHMMAX 154 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 155 #endif 156 #ifndef SHMMIN 157 #define SHMMIN 1 158 #endif 159 #ifndef SHMMNI 160 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 161 #endif 162 #ifndef SHMSEG 163 #define SHMSEG 128 164 #endif 165 #define SHMALL SHMMAXPGS 166 167 struct shminfo shminfo = { 168 SHMMAX, 169 SHMMIN, 170 SHMMNI, 171 SHMSEG, 172 SHMALL 173 }; 174 #endif 175 176 /* 177 * Values in support of System V compatible semaphores. 178 */ 179 #ifdef SYSVSEM 180 struct seminfo seminfo = { 181 SEMMAP, /* # of entries in semaphore map */ 182 SEMMNI, /* # of semaphore identifiers */ 183 SEMMNS, /* # of semaphores in system */ 184 SEMMNU, /* # of undo structures in system */ 185 SEMMSL, /* max # of semaphores per id */ 186 SEMOPM, /* max # of operations per semop call */ 187 SEMUME, /* max # of undo entries per process */ 188 SEMUSZ, /* size in bytes of undo structure */ 189 SEMVMX, /* semaphore maximum value */ 190 SEMAEM /* adjust on exit max value */ 191 }; 192 #endif 193 194 /* 195 * Values in support of System V compatible messages. 196 */ 197 #ifdef SYSVMSG 198 struct msginfo msginfo = { 199 MSGMAX, /* max chars in a message */ 200 MSGMNI, /* # of message queue identifiers */ 201 MSGMNB, /* max chars in a queue */ 202 MSGTQL, /* max messages in system */ 203 MSGSSZ, /* size of a message segment */ 204 /* (must be small power of 2 greater than 4) */ 205 MSGSEG /* number of message segments */ 206 }; 207 #endif 208 209 /* 210 * Actual network mbuf sizes (read-only), for netstat. 211 */ 212 const int msize = MSIZE; 213 const int mclbytes = MCLBYTES; 214
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