subr_param.c revision 14328
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 8.2 (Berkeley) 1/21/94 39 * $Id: param.c,v 1.14 1996/01/04 20:28:02 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 82int hz = HZ; 83int tick = 1000000 / HZ; 84int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 85#define NPROC (20 + 16 * MAXUSERS) 86int maxproc = NPROC; /* maximum # of processes */ 87int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 88int maxfiles = NPROC*2; /* system wide open files limit */ 89int maxfilesperproc = NPROC*2; /* per-process open files limit */ 90int ncallout = 16 + NPROC; /* maximum # of timer events */ 91 92/* maximum # of mbuf clusters */ 93#ifndef NMBCLUSTERS 94int nmbclusters = 512 + MAXUSERS * 16; 95#else 96int nmbclusters = NMBCLUSTERS; 97#endif 98 99int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 100 101/* 102 * Values in support of System V compatible shared memory. XXX 103 */ 104#ifdef SYSVSHM 105#ifndef SHMMAX 106#define SHMMAX (SHMMAXPGS*NBPG) 107#endif 108#ifndef SHMMIN 109#define SHMMIN 1 110#endif 111#ifndef SHMMNI 112#define SHMMNI 32 /* <= SHMMMNI in shm.h */ 113#endif 114#ifndef SHMSEG 115#define SHMSEG 8 116#endif 117#ifndef SHMALL 118#define SHMALL (SHMMAXPGS/CLSIZE) 119#endif 120 121struct shminfo shminfo = { 122 SHMMAX, 123 SHMMIN, 124 SHMMNI, 125 SHMSEG, 126 SHMALL 127}; 128#endif 129 130/* 131 * Values in support of System V compatible semaphores. 132 */ 133 134#ifdef SYSVSEM 135 136struct seminfo seminfo = { 137 SEMMAP, /* # of entries in semaphore map */ 138 SEMMNI, /* # of semaphore identifiers */ 139 SEMMNS, /* # of semaphores in system */ 140 SEMMNU, /* # of undo structures in system */ 141 SEMMSL, /* max # of semaphores per id */ 142 SEMOPM, /* max # of operations per semop call */ 143 SEMUME, /* max # of undo entries per process */ 144 SEMUSZ, /* size in bytes of undo structure */ 145 SEMVMX, /* semaphore maximum value */ 146 SEMAEM /* adjust on exit max value */ 147}; 148#endif 149 150/* 151 * Values in support of System V compatible messages. 152 */ 153 154#ifdef SYSVMSG 155 156struct msginfo msginfo = { 157 MSGMAX, /* max chars in a message */ 158 MSGMNI, /* # of message queue identifiers */ 159 MSGMNB, /* max chars in a queue */ 160 MSGTQL, /* max messages in system */ 161 MSGSSZ, /* size of a message segment */ 162 /* (must be small power of 2 greater than 4) */ 163 MSGSEG /* number of message segments */ 164}; 165#endif 166 167/* 168 * These may be set to nonzero here or by patching. 169 * If they are nonzero at bootstrap time then they are 170 * initialized to values dependent on the memory size. 171 */ 172#ifdef NBUF 173int nbuf = NBUF; 174#else 175int nbuf = 0; 176#endif 177int nswbuf = 0; 178 179/* 180 * These have to be allocated somewhere; allocating 181 * them here forces loader errors if this file is omitted 182 * (if they've been externed everywhere else; hah!). 183 */ 184struct buf *swbuf; 185 186/* 187 * Proc/pgrp hashing. 188 * Here so that hash table sizes can depend on MAXUSERS/NPROC. 189 * Hash size must be a power of two. 190 * NOW omission of this file will cause loader errors! 191 */ 192 193#if NPROC > 1024 194#define PIDHSZ 512 195#else 196#if NPROC > 512 197#define PIDHSZ 256 198#else 199#if NPROC > 256 200#define PIDHSZ 128 201#else 202#define PIDHSZ 64 203#endif 204#endif 205#endif 206 207struct proc *pidhash[PIDHSZ]; 208struct pgrp *pgrphash[PIDHSZ]; 209int pidhashmask = PIDHSZ - 1; 210