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 * %sccs.include.redist.c% 11 * 12 * @(#)param.c 8.2 (Berkeley) 01/21/94 13 */ 14 15 #include <sys/param.h> 16 #include <sys/systm.h> 17 #include <sys/socket.h> 18 #include <sys/proc.h> 19 #include <sys/vnode.h> 20 #include <sys/file.h> 21 #include <sys/callout.h> 22 #include <sys/clist.h> 23 #include <sys/mbuf.h> 24 #include <sys/kernel.h> 25 26 #include <ufs/ufs/quota.h> 27 28 #ifdef SYSVSHM 29 #include <machine/vmparam.h> 30 #include <sys/shm.h> 31 #endif 32 33 /* 34 * System parameter formulae. 35 * 36 * This file is copied into each directory where we compile 37 * the kernel; it should be modified there to suit local taste 38 * if necessary. 39 * 40 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 41 */ 42 43 #ifndef HZ 44 #define HZ 100 45 #endif 46 int hz = HZ; 47 int tick = 1000000 / HZ; 48 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 49 struct timezone tz = { TIMEZONE, DST }; 50 #define NPROC (20 + 16 * MAXUSERS) 51 int maxproc = NPROC; 52 #define NTEXT (80 + NPROC / 8) /* actually the object cache */ 53 #define NVNODE (NPROC + NTEXT + 100) 54 int desiredvnodes = NVNODE; 55 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 56 int ncallout = 16 + NPROC; 57 int nclist = 60 + 12 * MAXUSERS; 58 int nmbclusters = NMBCLUSTERS; 59 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 60 61 /* 62 * Values in support of System V compatible shared memory. XXX 63 */ 64 #ifdef SYSVSHM 65 #define SHMMAX (SHMMAXPGS*NBPG) 66 #define SHMMIN 1 67 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 68 #define SHMSEG 8 69 #define SHMALL (SHMMAXPGS/CLSIZE) 70 71 struct shminfo shminfo = { 72 SHMMAX, 73 SHMMIN, 74 SHMMNI, 75 SHMSEG, 76 SHMALL 77 }; 78 #endif 79 80 /* 81 * These are initialized at bootstrap time 82 * to values dependent on memory size 83 */ 84 int nbuf, nswbuf; 85 86 /* 87 * These have to be allocated somewhere; allocating 88 * them here forces loader errors if this file is omitted 89 * (if they've been externed everywhere else; hah!). 90 */ 91 struct callout *callout; 92 struct cblock *cfree; 93 struct buf *buf, *swbuf; 94 char *buffers; 95 96 /* 97 * Proc/pgrp hashing. 98 * Here so that hash table sizes can depend on MAXUSERS/NPROC. 99 * Hash size must be a power of two. 100 * NOW omission of this file will cause loader errors! 101 */ 102 103 #if NPROC > 1024 104 #define PIDHSZ 512 105 #else 106 #if NPROC > 512 107 #define PIDHSZ 256 108 #else 109 #if NPROC > 256 110 #define PIDHSZ 128 111 #else 112 #define PIDHSZ 64 113 #endif 114 #endif 115 #endif 116 117 struct proc *pidhash[PIDHSZ]; 118 struct pgrp *pgrphash[PIDHSZ]; 119 int pidhashmask = PIDHSZ - 1; 120