1 /* 2 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)param.c 7.17 (Berkeley) 04/20/91 8 */ 9 10 #ifndef lint 11 char copyright[] = 12 "@(#) Copyright (c) 1980, 1986, 1989 Regents of the University of California.\n\ 13 All rights reserved.\n"; 14 #endif not lint 15 16 #include "sys/param.h" 17 #include "sys/systm.h" 18 #include "sys/socket.h" 19 #include "sys/proc.h" 20 #include "sys/vnode.h" 21 #include "sys/file.h" 22 #include "sys/callout.h" 23 #include "sys/clist.h" 24 #include "sys/mbuf.h" 25 #include "ufs/quota.h" 26 #include "sys/kernel.h" 27 #ifdef SYSVSHM 28 #include "machine/vmparam.h" 29 #include "sys/shm.h" 30 #endif 31 32 /* 33 * System parameter formulae. 34 * 35 * This file is copied into each directory where we compile 36 * the kernel; it should be modified there to suit local taste 37 * if necessary. 38 * 39 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 40 */ 41 42 #ifndef HZ 43 #define HZ 100 44 #endif 45 int hz = HZ; 46 int tick = 1000000 / HZ; 47 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 48 struct timezone tz = { TIMEZONE, DST }; 49 #define NPROC (20 + 8 * MAXUSERS) 50 int maxproc = NPROC; 51 #define NTEXT 100 /* actually the object cache */ 52 #define NVNODE (NPROC + NTEXT + 300) 53 long desiredvnodes = NVNODE; 54 int nfile = 16 * (NPROC + 16 + MAXUSERS) / 10 + 32; 55 int ncallout = 16 + NPROC; 56 int nclist = 60 + 12 * MAXUSERS; 57 int nmbclusters = NMBCLUSTERS; 58 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 59 60 /* 61 * Values in support of System V compatible shared memory. 62 */ 63 #ifdef SYSVSHM 64 #define SHMMAX (SHMMAXPGS*NBPG) 65 #define SHMMIN 1 66 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 67 #define SHMSEG 8 68 #define SHMALL (SHMMAXPGS/CLSIZE) 69 70 struct shminfo shminfo = { 71 SHMMAX, 72 SHMMIN, 73 SHMMNI, 74 SHMSEG, 75 SHMALL 76 }; 77 #endif 78 79 /* 80 * These are initialized at bootstrap time 81 * to values dependent on memory size 82 */ 83 int nbuf, nswbuf; 84 85 /* 86 * These have to be allocated somewhere; allocating 87 * them here forces loader errors if this file is omitted 88 * (if they've been externed everywhere else; hah!). 89 */ 90 struct file *file, *fileNFILE; 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