param.c revision 1.66
1 /* $NetBSD: param.c,v 1.66 2015/08/24 22:50:33 pooka 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 1.66 2015/08/24 22:50:33 pooka Exp $"); 41 42 #ifdef _KERNEL_OPT 43 #include "opt_hz.h" 44 #include "opt_rtc_offset.h" 45 #include "opt_sysv.h" 46 #include "opt_sysvparam.h" 47 #include "opt_multiprocessor.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/proc.h> 55 #include <sys/vnode.h> 56 #include <sys/file.h> 57 #include <sys/callout.h> 58 #include <sys/mbuf.h> 59 #include <ufs/ufs/quota.h> 60 #include <sys/kernel.h> 61 #include <sys/utsname.h> 62 #include <sys/ksem.h> 63 #include <sys/lwp.h> 64 #ifdef SYSVSHM 65 #include <machine/vmparam.h> 66 #include <sys/shm.h> 67 #endif 68 #ifdef SYSVSEM 69 #include <sys/sem.h> 70 #endif 71 #ifdef SYSVMSG 72 #include <sys/msg.h> 73 #endif 74 75 /* 76 * PCC cannot handle the 80KB string literal. 77 */ 78 #if !defined(__PCC__) 79 #define CONFIG_FILE 80 #include "config_file.h" 81 #endif 82 83 /* 84 * System parameter formulae. 85 * 86 * This file is copied into each directory where we compile 87 * the kernel; it should be modified there to suit local taste 88 * if necessary. 89 * 90 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 91 */ 92 93 #ifdef TIMEZONE 94 #error TIMEZONE is an obsolete kernel option. 95 #endif 96 97 #ifdef DST 98 #error DST is an obsolete kernel option. 99 #endif 100 101 #ifndef RTC_OFFSET 102 #define RTC_OFFSET 0 103 #endif 104 105 #ifndef HZ 106 #define HZ 100 107 #endif 108 109 #ifndef MAXFILES 110 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 111 #endif 112 113 #ifndef MAXEXEC 114 #define MAXEXEC 16 115 #endif 116 117 int hz = HZ; 118 int tick = 1000000 / HZ; 119 /* can adjust 240ms in 60s */ 120 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 121 int rtc_offset = RTC_OFFSET; 122 int maxproc = NPROC; 123 int maxlwp = MAXLWP; 124 int desiredvnodes = NVNODE; 125 u_int maxfiles = MAXFILES; 126 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 127 int maxexec = MAXEXEC; /* max number of concurrent exec() calls */ 128 129 #ifdef MULTIPROCESSOR 130 u_int maxcpus = MAXCPUS; 131 size_t coherency_unit = COHERENCY_UNIT; 132 #else 133 u_int maxcpus = 1; 134 size_t coherency_unit = ALIGNBYTES + 1; 135 #endif 136 137 /* 138 * Various mbuf-related parameters. These can also be changed at run-time 139 * with sysctl. 140 */ 141 int nmbclusters = 0; 142 143 #ifndef MBLOWAT 144 #define MBLOWAT 16 145 #endif 146 int mblowat = MBLOWAT; 147 148 #ifndef MCLLOWAT 149 #define MCLLOWAT 8 150 #endif 151 int mcllowat = MCLLOWAT; 152 153 #if XXX_PRG 154 /* 155 * Values in support of System V compatible shared memory. XXX 156 */ 157 #ifdef SYSVSHM 158 #if !defined(SHMMAX) && defined(SHMMAXPGS) 159 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 160 #elif !defined(SHMMAX) 161 #define SHMMAX 0 162 #endif 163 #ifndef SHMMIN 164 #define SHMMIN 1 165 #endif 166 #ifndef SHMMNI 167 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 168 #endif 169 #ifndef SHMSEG 170 #define SHMSEG 128 171 #endif 172 173 struct shminfo shminfo = { 174 SHMMAX, 175 SHMMIN, 176 SHMMNI, 177 SHMSEG, 178 0 179 }; 180 #endif 181 182 /* 183 * Values in support of System V compatible semaphores. 184 */ 185 #ifdef SYSVSEM 186 struct seminfo seminfo = { 187 SEMMAP, /* # of entries in semaphore map */ 188 SEMMNI, /* # of semaphore identifiers */ 189 SEMMNS, /* # of semaphores in system */ 190 SEMMNU, /* # of undo structures in system */ 191 SEMMSL, /* max # of semaphores per id */ 192 SEMOPM, /* max # of operations per semop call */ 193 SEMUME, /* max # of undo entries per process */ 194 SEMUSZ, /* size in bytes of undo structure */ 195 SEMVMX, /* semaphore maximum value */ 196 SEMAEM /* adjust on exit max value */ 197 }; 198 #endif 199 200 /* 201 * Values in support of System V compatible messages. 202 */ 203 #ifdef SYSVMSG 204 struct msginfo msginfo = { 205 MSGMAX, /* max chars in a message */ 206 MSGMNI, /* # of message queue identifiers */ 207 MSGMNB, /* max chars in a queue */ 208 MSGTQL, /* max messages in system */ 209 MSGSSZ, /* size of a message segment */ 210 /* (must be small power of 2 greater than 4) */ 211 MSGSEG /* number of message segments */ 212 }; 213 #endif 214 #endif /* XXX_PRG */ 215 216 /* 217 * Actual network mbuf sizes (read-only), for netstat. 218 */ 219 const int msize = MSIZE; 220 const int mclbytes = MCLBYTES; 221 222 /* 223 * Values in support of POSIX semaphores. 224 */ 225 int ksem_max = KSEM_MAX; 226
Indexes created Sun Sep 21 19:09:51 GMT 2025