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1.1 root 1: /*
2: * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)param.c 7.20 (Berkeley) 6/27/91
34: */
35:
36: #include "sys/param.h"
37: #include "sys/systm.h"
38: #include "sys/socket.h"
39: #include "sys/proc.h"
40: #include "sys/vnode.h"
41: #include "sys/file.h"
42: #include "sys/callout.h"
43: #include "sys/clist.h"
44: #include "sys/mbuf.h"
45: #include "ufs/quota.h"
46: #include "sys/kernel.h"
47: #ifdef SYSVSHM
48: #include "machine/vmparam.h"
49: #include "sys/shm.h"
50: #endif
51:
52: /*
53: * System parameter formulae.
54: *
55: * This file is copied into each directory where we compile
56: * the kernel; it should be modified there to suit local taste
57: * if necessary.
58: *
59: * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
60: */
61:
62: #ifndef HZ
63: #define HZ 100
64: #endif
65: int hz = HZ;
66: int tick = 1000000 / HZ;
67: int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */
68: struct timezone tz = { TIMEZONE, DST };
69: #define NPROC (20 + 16 * MAXUSERS)
70: int maxproc = NPROC;
71: #define NTEXT (80 + NPROC / 8) /* actually the object cache */
72: #define NVNODE (NPROC + NTEXT + 100)
73: long desiredvnodes = NVNODE;
74: int maxfiles = 3 * (NPROC + MAXUSERS) + 80;
75: int ncallout = 16 + NPROC;
76: int nclist = 60 + 12 * MAXUSERS;
77: int nmbclusters = NMBCLUSTERS;
78: int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
79:
80: /*
81: * Values in support of System V compatible shared memory. XXX
82: */
83: #ifdef SYSVSHM
84: #define SHMMAX (SHMMAXPGS*NBPG)
85: #define SHMMIN 1
86: #define SHMMNI 32 /* <= SHMMMNI in shm.h */
87: #define SHMSEG 8
88: #define SHMALL (SHMMAXPGS/CLSIZE)
89:
90: struct shminfo shminfo = {
91: SHMMAX,
92: SHMMIN,
93: SHMMNI,
94: SHMSEG,
95: SHMALL
96: };
97: #endif
98:
99: /*
100: * These are initialized at bootstrap time
101: * to values dependent on memory size
102: */
103: int nbuf, nswbuf;
104:
105: /*
106: * These have to be allocated somewhere; allocating
107: * them here forces loader errors if this file is omitted
108: * (if they've been externed everywhere else; hah!).
109: */
110: struct callout *callout;
111: struct cblock *cfree;
112: struct buf *buf, *swbuf;
113: char *buffers;
114:
115: /*
116: * Proc/pgrp hashing.
117: * Here so that hash table sizes can depend on MAXUSERS/NPROC.
118: * Hash size must be a power of two.
119: * NOW omission of this file will cause loader errors!
120: */
121:
122: #if NPROC > 1024
123: #define PIDHSZ 512
124: #else
125: #if NPROC > 512
126: #define PIDHSZ 256
127: #else
128: #if NPROC > 256
129: #define PIDHSZ 128
130: #else
131: #define PIDHSZ 64
132: #endif
133: #endif
134: #endif
135:
136: struct proc *pidhash[PIDHSZ];
137: struct pgrp *pgrphash[PIDHSZ];
138: int pidhashmask = PIDHSZ - 1;
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