param.c revision 1.64
1 /* $NetBSD: param.c,v 1.64 2012/06/09 02:31:14 christos 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 1.64 2012/06/09 02:31:14 christos 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_multiprocessor.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/proc.h> 53 #include <sys/vnode.h> 54 #include <sys/file.h> 55 #include <sys/callout.h> 56 #include <sys/mbuf.h> 57 #include <ufs/ufs/quota.h> 58 #include <sys/kernel.h> 59 #include <sys/utsname.h> 60 #include <sys/ksem.h> 61 #include <sys/lwp.h> 62 #ifdef SYSVSHM 63 #include <machine/vmparam.h> 64 #include <sys/shm.h> 65 #endif 66 #ifdef SYSVSEM 67 #include <sys/sem.h> 68 #endif 69 #ifdef SYSVMSG 70 #include <sys/msg.h> 71 #endif 72 73 /* 74 * PCC cannot handle the 80KB string literal. 75 */ 76 #if !defined(__PCC__) 77 #define CONFIG_FILE 78 #include "config_file.h" 79 #endif 80 81 /* 82 * System parameter formulae. 83 * 84 * This file is copied into each directory where we compile 85 * the kernel; it should be modified there to suit local taste 86 * if necessary. 87 * 88 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 89 */ 90 91 #ifdef TIMEZONE 92 #error TIMEZONE is an obsolete kernel option. 93 #endif 94 95 #ifdef DST 96 #error DST is an obsolete kernel option. 97 #endif 98 99 #ifndef RTC_OFFSET 100 #define RTC_OFFSET 0 101 #endif 102 103 #ifndef HZ 104 #define HZ 100 105 #endif 106 107 #ifndef MAXFILES 108 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 109 #endif 110 111 #ifndef MAXEXEC 112 #define MAXEXEC 16 113 #endif 114 115 int hz = HZ; 116 int tick = 1000000 / HZ; 117 /* can adjust 240ms in 60s */ 118 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 119 int rtc_offset = RTC_OFFSET; 120 int maxproc = NPROC; 121 int maxlwp = MAXLWP; 122 int desiredvnodes = NVNODE; 123 u_int maxfiles = MAXFILES; 124 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 125 int maxexec = MAXEXEC; /* max number of concurrent exec() calls */ 126 127 #ifdef MULTIPROCESSOR 128 u_int maxcpus = MAXCPUS; 129 size_t coherency_unit = COHERENCY_UNIT; 130 #else 131 u_int maxcpus = 1; 132 size_t coherency_unit = ALIGNBYTES + 1; 133 #endif 134 135 /* 136 * Various mbuf-related parameters. These can also be changed at run-time 137 * with sysctl. 138 */ 139 int nmbclusters = 0; 140 141 #ifndef MBLOWAT 142 #define MBLOWAT 16 143 #endif 144 int mblowat = MBLOWAT; 145 146 #ifndef MCLLOWAT 147 #define MCLLOWAT 8 148 #endif 149 int mcllowat = MCLLOWAT; 150 151 /* 152 * Values in support of System V compatible shared memory. XXX 153 */ 154 #ifdef SYSVSHM 155 #if !defined(SHMMAX) && defined(SHMMAXPGS) 156 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 157 #elif !defined(SHMMAX) 158 #define SHMMAX 0 159 #endif 160 #ifndef SHMMIN 161 #define SHMMIN 1 162 #endif 163 #ifndef SHMMNI 164 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 165 #endif 166 #ifndef SHMSEG 167 #define SHMSEG 128 168 #endif 169 170 struct shminfo shminfo = { 171 SHMMAX, 172 SHMMIN, 173 SHMMNI, 174 SHMSEG, 175 0 176 }; 177 #endif 178 179 /* 180 * Values in support of System V compatible semaphores. 181 */ 182 #ifdef SYSVSEM 183 struct seminfo seminfo = { 184 SEMMAP, /* # of entries in semaphore map */ 185 SEMMNI, /* # of semaphore identifiers */ 186 SEMMNS, /* # of semaphores in system */ 187 SEMMNU, /* # of undo structures in system */ 188 SEMMSL, /* max # of semaphores per id */ 189 SEMOPM, /* max # of operations per semop call */ 190 SEMUME, /* max # of undo entries per process */ 191 SEMUSZ, /* size in bytes of undo structure */ 192 SEMVMX, /* semaphore maximum value */ 193 SEMAEM /* adjust on exit max value */ 194 }; 195 #endif 196 197 /* 198 * Values in support of System V compatible messages. 199 */ 200 #ifdef SYSVMSG 201 struct msginfo msginfo = { 202 MSGMAX, /* max chars in a message */ 203 MSGMNI, /* # of message queue identifiers */ 204 MSGMNB, /* max chars in a queue */ 205 MSGTQL, /* max messages in system */ 206 MSGSSZ, /* size of a message segment */ 207 /* (must be small power of 2 greater than 4) */ 208 MSGSEG /* number of message segments */ 209 }; 210 #endif 211 212 /* 213 * Actual network mbuf sizes (read-only), for netstat. 214 */ 215 const int msize = MSIZE; 216 const int mclbytes = MCLBYTES; 217 218 /* 219 * Values in support of POSIX semaphores. 220 */ 221 int ksem_max = KSEM_MAX; 222
Indexes created Mon Sep 22 21:09:42 GMT 2025