subr_param.c revision 9759 
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 1.11 1995/06/29 08:21:32 davidg Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/socket.h>
45#include <sys/proc.h>
46#include <sys/vnode.h>
47#include <sys/file.h>
48#include <sys/callout.h>
49#include <sys/clist.h>
50#include <sys/mbuf.h>
51#include <sys/kernel.h>
52
53#include <ufs/ufs/quota.h>
54
55#ifdef SYSVSHM
56#include <machine/vmparam.h>
57#include <sys/shm.h>
58#endif
59#ifdef SYSVSEM
60#include "sys/sem.h"
61#endif
62#ifdef SYSVMSG
63#include "sys/msg.h"
64#endif
65
66/*
67 * System parameter formulae.
68 *
69 * This file is copied into each directory where we compile
70 * the kernel; it should be modified there to suit local taste
71 * if necessary.
72 *
73 * Compiled with -DMAXUSERS=xx
74 */
75
76#ifndef HZ
77#define	HZ 100
78#endif
79int	hz = HZ;
80int	tick = 1000000 / HZ;
81int	tickadj = 30000 / (60 * HZ);		/* can adjust 30ms in 60s */
82#define	NPROC (20 + 16 * MAXUSERS)
83int	maxproc = NPROC;			/* maximum # of processes */
84int	maxprocperuid = NPROC-1;		/* maximum # of processes per user */
85int	maxfiles = NPROC*2;			/* system wide open files limit */
86int	maxfilesperproc = NPROC*2;		/* per-process open files limit */
87int	ncallout = 16 + NPROC;			/* maximum # of timer events */
88
89/* maximum # of mbuf clusters */
90#ifndef NMBCLUSTERS
91int	nmbclusters = 512 + MAXUSERS * 16;
92#else
93int	nmbclusters = NMBCLUSTERS;
94#endif
95
96int	fscale = FSCALE;	/* kernel uses `FSCALE', user uses `fscale' */
97
98/*
99 * Values in support of System V compatible shared memory.	XXX
100 */
101#ifdef SYSVSHM
102#ifndef SHMMAX
103#define	SHMMAX	(SHMMAXPGS*NBPG)
104#endif
105#ifndef SHMMIN
106#define	SHMMIN	1
107#endif
108#ifndef SHMMNI
109#define	SHMMNI	32			/* <= SHMMMNI in shm.h */
110#endif
111#ifndef SHMSEG
112#define	SHMSEG	8
113#endif
114#ifndef SHMALL
115#define	SHMALL	(SHMMAXPGS/CLSIZE)
116#endif
117
118struct	shminfo shminfo = {
119	SHMMAX,
120	SHMMIN,
121	SHMMNI,
122	SHMSEG,
123	SHMALL
124};
125#endif
126
127/*
128 * Values in support of System V compatible semaphores.
129 */
130
131#ifdef SYSVSEM
132
133struct seminfo seminfo = {
134                SEMMAP,         /* # of entries in semaphore map */
135                SEMMNI,         /* # of semaphore identifiers */
136                SEMMNS,         /* # of semaphores in system */
137                SEMMNU,         /* # of undo structures in system */
138                SEMMSL,         /* max # of semaphores per id */
139                SEMOPM,         /* max # of operations per semop call */
140                SEMUME,         /* max # of undo entries per process */
141                SEMUSZ,         /* size in bytes of undo structure */
142                SEMVMX,         /* semaphore maximum value */
143                SEMAEM          /* adjust on exit max value */
144};
145#endif
146
147/*
148 * Values in support of System V compatible messages.
149 */
150
151#ifdef SYSVMSG
152
153struct msginfo msginfo = {
154                MSGMAX,         /* max chars in a message */
155                MSGMNI,         /* # of message queue identifiers */
156                MSGMNB,         /* max chars in a queue */
157                MSGTQL,         /* max messages in system */
158                MSGSSZ,         /* size of a message segment */
159                		/* (must be small power of 2 greater than 4) */
160                MSGSEG          /* number of message segments */
161};
162#endif
163
164/*
165 * These may be set to nonzero here or by patching.
166 * If they are nonzero at bootstrap time then they are
167 * initialized to values dependent on the memory size.
168 */
169#ifdef	NBUF
170int	nbuf = NBUF;
171#else
172int	nbuf = 0;
173#endif
174int	nswbuf = 0;
175
176/*
177 * These have to be allocated somewhere; allocating
178 * them here forces loader errors if this file is omitted
179 * (if they've been externed everywhere else; hah!).
180 */
181struct	cblock *cfree;
182struct	buf *swbuf;
183char	*buffers;
184
185/*
186 * Proc/pgrp hashing.
187 * Here so that hash table sizes can depend on MAXUSERS/NPROC.
188 * Hash size must be a power of two.
189 * NOW omission of this file will cause loader errors!
190 */
191
192#if NPROC > 1024
193#define	PIDHSZ		512
194#else
195#if NPROC > 512
196#define	PIDHSZ		256
197#else
198#if NPROC > 256
199#define	PIDHSZ		128
200#else
201#define	PIDHSZ		64
202#endif
203#endif
204#endif
205
206struct	proc *pidhash[PIDHSZ];
207struct	pgrp *pgrphash[PIDHSZ];
208int	pidhashmask = PIDHSZ - 1;
209