FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c
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 8.3 (Berkeley) 8/20/94
39 * $FreeBSD: src/sys/conf/param.c,v 1.20.2.5 1999/09/05 08:08:37 peter Exp $
40 */
41
42 #include "opt_sysvipc.h"
43 #include "opt_param.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/socket.h>
48 #include <sys/proc.h>
49 #include <sys/vnode.h>
50 #include <sys/file.h>
51 #include <sys/callout.h>
52 #include <sys/clist.h>
53 #include <sys/mbuf.h>
54 #include <sys/kernel.h>
55
56 #include <ufs/ufs/quota.h>
57
58 #ifdef SYSVSHM
59 #include <machine/vmparam.h>
60 #include <sys/shm.h>
61 #endif
62 #ifdef SYSVSEM
63 #include <sys/sem.h>
64 #endif
65 #ifdef SYSVMSG
66 #include <sys/msg.h>
67 #endif
68
69 /*
70 * System parameter formulae.
71 *
72 * This file is copied into each directory where we compile
73 * the kernel; it should be modified there to suit local taste
74 * if necessary.
75 *
76 * Compiled with -DMAXUSERS=xx
77 */
78
79 #ifndef HZ
80 #define HZ 100
81 #endif
82 int hz = HZ;
83 int tick = 1000000 / HZ;
84 int tickadj = howmany(30000, 60 * HZ); /* can adjust 30ms in 60s */
85 #define NPROC (20 + 16 * MAXUSERS)
86 #define MAXFILES (NPROC*2)
87 int maxproc = NPROC; /* maximum # of processes */
88 int maxprocperuid = NPROC-1; /* maximum # of processes per user */
89 int maxfiles = MAXFILES; /* system wide open files limit */
90 int maxfilesperproc = MAXFILES; /* per-process open files limit */
91 int ncallout = 16 + NPROC + MAXFILES; /* maximum # of timer events */
92
93 /* maximum # of mbuf clusters */
94 #ifndef NMBCLUSTERS
95 #define NMBCLUSTERS (512 + MAXUSERS * 16)
96 #endif
97 int nmbclusters = NMBCLUSTERS;
98
99 /* allocate 1/4th amount of virtual address space for mbufs XXX */
100 int nmbufs = NMBCLUSTERS * 4;
101
102 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
103
104 /*
105 * Values in support of System V compatible shared memory. XXX
106 */
107 #ifdef SYSVSHM
108 #ifndef SHMMAX
109 #define SHMMAX (SHMMAXPGS*PAGE_SIZE)
110 #endif
111 #ifndef SHMMIN
112 #define SHMMIN 1
113 #endif
114 #ifndef SHMMNI
115 #define SHMMNI 32 /* <= SHMMMNI in shm.h */
116 #endif
117 #ifndef SHMSEG
118 #define SHMSEG 8
119 #endif
120 #ifndef SHMALL
121 #define SHMALL (SHMMAXPGS)
122 #endif
123
124 struct shminfo shminfo = {
125 SHMMAX,
126 SHMMIN,
127 SHMMNI,
128 SHMSEG,
129 SHMALL
130 };
131 #endif
132
133 /*
134 * Values in support of System V compatible semaphores.
135 */
136
137 #ifdef SYSVSEM
138
139 struct seminfo seminfo = {
140 SEMMAP, /* # of entries in semaphore map */
141 SEMMNI, /* # of semaphore identifiers */
142 SEMMNS, /* # of semaphores in system */
143 SEMMNU, /* # of undo structures in system */
144 SEMMSL, /* max # of semaphores per id */
145 SEMOPM, /* max # of operations per semop call */
146 SEMUME, /* max # of undo entries per process */
147 SEMUSZ, /* size in bytes of undo structure */
148 SEMVMX, /* semaphore maximum value */
149 SEMAEM /* adjust on exit max value */
150 };
151 #endif
152
153 /*
154 * Values in support of System V compatible messages.
155 */
156
157 #ifdef SYSVMSG
158
159 struct msginfo msginfo = {
160 MSGMAX, /* max chars in a message */
161 MSGMNI, /* # of message queue identifiers */
162 MSGMNB, /* max chars in a queue */
163 MSGTQL, /* max messages in system */
164 MSGSSZ, /* size of a message segment */
165 /* (must be small power of 2 greater than 4) */
166 MSGSEG /* number of message segments */
167 };
168 #endif
169
170 /*
171 * These may be set to nonzero here or by patching.
172 * If they are nonzero at bootstrap time then they are
173 * initialized to values dependent on the memory size.
174 */
175 #ifdef NBUF
176 int nbuf = NBUF;
177 #else
178 int nbuf = 0;
179 #endif
180 int nswbuf = 0;
181
182 /*
183 * These have to be allocated somewhere; allocating
184 * them here forces loader errors if this file is omitted
185 * (if they've been externed everywhere else; hah!).
186 */
187 struct buf *swbuf;
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