FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c
1 /* $NetBSD: param.c,v 1.48 2004/09/27 14:08:13 christos Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
5 * All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)param.c 7.20 (Berkeley) 6/27/91
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.48 2004/09/27 14:08:13 christos Exp $");
41
42 #include "opt_hz.h"
43 #include "opt_rtc_offset.h"
44 #include "opt_sysv.h"
45 #include "opt_sysvparam.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/proc.h>
52 #include <sys/vnode.h>
53 #include <sys/file.h>
54 #include <sys/callout.h>
55 #include <sys/mbuf.h>
56 #include <ufs/ufs/quota.h>
57 #include <sys/kernel.h>
58 #include <sys/utsname.h>
59 #ifdef SYSVSHM
60 #include <machine/vmparam.h>
61 #include <sys/shm.h>
62 #endif
63 #ifdef SYSVSEM
64 #include <sys/sem.h>
65 #endif
66 #ifdef SYSVMSG
67 #include <sys/msg.h>
68 #endif
69
70 #define CONFIG_FILE
71 #include "config_file.h"
72
73 /*
74 * System parameter formulae.
75 *
76 * This file is copied into each directory where we compile
77 * the kernel; it should be modified there to suit local taste
78 * if necessary.
79 *
80 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
81 */
82
83 #ifdef TIMEZONE
84 #error TIMEZONE is an obsolete kernel option.
85 #endif
86
87 #ifdef DST
88 #error DST is an obsolete kernel option.
89 #endif
90
91 #ifndef RTC_OFFSET
92 #define RTC_OFFSET 0
93 #endif
94
95 #ifndef HZ
96 #define HZ 100
97 #endif
98
99 #ifndef MAXFILES
100 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80)
101 #endif
102
103 int hz = HZ;
104 int tick = 1000000 / HZ;
105 /* can adjust 240ms in 60s */
106 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
107 int rtc_offset = RTC_OFFSET;
108 int maxproc = NPROC;
109 int desiredvnodes = NVNODE;
110 int maxfiles = MAXFILES;
111 int ncallout = 16 + NPROC; /* size of callwheel (rounded to ^2) */
112 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
113
114 /*
115 * Various mbuf-related parameters. These can also be changed at run-time
116 * with sysctl.
117 */
118 int nmbclusters = NMBCLUSTERS;
119
120 #ifndef MBLOWAT
121 #define MBLOWAT 16
122 #endif
123 int mblowat = MBLOWAT;
124
125 #ifndef MCLLOWAT
126 #define MCLLOWAT 8
127 #endif
128 int mcllowat = MCLLOWAT;
129
130 /*
131 * Values in support of System V compatible shared memory. XXX
132 */
133 #ifdef SYSVSHM
134 #ifndef SHMMAX
135 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */
136 #endif
137 #ifndef SHMMIN
138 #define SHMMIN 1
139 #endif
140 #ifndef SHMMNI
141 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */
142 #endif
143 #ifndef SHMSEG
144 #define SHMSEG 128
145 #endif
146 #define SHMALL SHMMAXPGS
147
148 struct shminfo shminfo = {
149 SHMMAX,
150 SHMMIN,
151 SHMMNI,
152 SHMSEG,
153 SHMALL
154 };
155 #endif
156
157 /*
158 * Values in support of System V compatible semaphores.
159 */
160 #ifdef SYSVSEM
161 struct seminfo seminfo = {
162 SEMMAP, /* # of entries in semaphore map */
163 SEMMNI, /* # of semaphore identifiers */
164 SEMMNS, /* # of semaphores in system */
165 SEMMNU, /* # of undo structures in system */
166 SEMMSL, /* max # of semaphores per id */
167 SEMOPM, /* max # of operations per semop call */
168 SEMUME, /* max # of undo entries per process */
169 SEMUSZ, /* size in bytes of undo structure */
170 SEMVMX, /* semaphore maximum value */
171 SEMAEM /* adjust on exit max value */
172 };
173 #endif
174
175 /*
176 * Values in support of System V compatible messages.
177 */
178 #ifdef SYSVMSG
179 struct msginfo msginfo = {
180 MSGMAX, /* max chars in a message */
181 MSGMNI, /* # of message queue identifiers */
182 MSGMNB, /* max chars in a queue */
183 MSGTQL, /* max messages in system */
184 MSGSSZ, /* size of a message segment */
185 /* (must be small power of 2 greater than 4) */
186 MSGSEG /* number of message segments */
187 };
188 #endif
189
190 /*
191 * These control when and to what priority a process gets after a certain
192 * amount of CPU time expires. AUTONICETIME is in seconds.
193 * AUTONICEVAL is NOT offset by NZERO, i.e. it's between PRIO_MIN and PRIO_MAX.
194 */
195 #ifndef AUTONICETIME
196 #define AUTONICETIME 0 /* disabled */
197 #endif
198
199 #ifndef AUTONICEVAL
200 #define AUTONICEVAL 4 /* default + 4 */
201 #endif
202
203 int autonicetime = AUTONICETIME;
204 int autoniceval = AUTONICEVAL;
205
206 /*
207 * Actual network mbuf sizes (read-only), for netstat.
208 */
209 const int msize = MSIZE;
210 const int mclbytes = MCLBYTES;
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