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 7.22 (Berkeley) 07/12/92 8 */ 9 10 #include "sys/param.h" 11 #include "sys/systm.h" 12 #include "sys/socket.h" 13 #include "sys/proc.h" 14 #include "sys/vnode.h" 15 #include "sys/file.h" 16 #include "sys/callout.h" 17 #include "sys/clist.h" 18 #include "sys/mbuf.h" 19 #include "ufs/ufs/quota.h" 20 #include "sys/kernel.h" 21 #ifdef SYSVSHM 22 #include "machine/vmparam.h" 23 #include "sys/shm.h" 24 #endif 25 26 /* 27 * System parameter formulae. 28 * 29 * This file is copied into each directory where we compile 30 * the kernel; it should be modified there to suit local taste 31 * if necessary. 32 * 33 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 34 */ 35 36 #ifndef HZ 37 #define HZ 100 38 #endif 39 int hz = HZ; 40 int tick = 1000000 / HZ; 41 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 42 struct timezone tz = { TIMEZONE, DST }; 43 #define NPROC (20 + 16 * MAXUSERS) 44 int maxproc = NPROC; 45 #define NTEXT (80 + NPROC / 8) /* actually the object cache */ 46 #define NVNODE (NPROC + NTEXT + 100) 47 long desiredvnodes = NVNODE; 48 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 49 int ncallout = 16 + NPROC; 50 int nclist = 60 + 12 * MAXUSERS; 51 int nmbclusters = NMBCLUSTERS; 52 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 53 54 /* 55 * Values in support of System V compatible shared memory. XXX 56 */ 57 #ifdef SYSVSHM 58 #define SHMMAX (SHMMAXPGS*NBPG) 59 #define SHMMIN 1 60 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 61 #define SHMSEG 8 62 #define SHMALL (SHMMAXPGS/CLSIZE) 63 64 struct shminfo shminfo = { 65 SHMMAX, 66 SHMMIN, 67 SHMMNI, 68 SHMSEG, 69 SHMALL 70 }; 71 #endif 72 73 /* 74 * These are initialized at bootstrap time 75 * to values dependent on memory size 76 */ 77 int nbuf, nswbuf; 78 79 /* 80 * These have to be allocated somewhere; allocating 81 * them here forces loader errors if this file is omitted 82 * (if they've been externed everywhere else; hah!). 83 */ 84 struct callout *callout; 85 struct cblock *cfree; 86 struct buf *buf, *swbuf; 87 char *buffers; 88 89 /* 90 * Proc/pgrp hashing. 91 * Here so that hash table sizes can depend on MAXUSERS/NPROC. 92 * Hash size must be a power of two. 93 * NOW omission of this file will cause loader errors! 94 */ 95 96 #if NPROC > 1024 97 #define PIDHSZ 512 98 #else 99 #if NPROC > 512 100 #define PIDHSZ 256 101 #else 102 #if NPROC > 256 103 #define PIDHSZ 128 104 #else 105 #define PIDHSZ 64 106 #endif 107 #endif 108 #endif 109 110 struct proc *pidhash[PIDHSZ]; 111 struct pgrp *pgrphash[PIDHSZ]; 112 int pidhashmask = PIDHSZ - 1; 113