FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c
1 /* $NetBSD: param.c,v 1.50 2005/12/21 10:57:22 yamt 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 1.50 2005/12/21 10:57:22 yamt Exp $");
41
42 #include "opt_hz.h"
43 #include "opt_rtc_offset.h"
44 #include "opt_sysv.h"
45 #include "opt_sysvparam.h"
46 #include "opt_nmbclusters.h"
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/proc.h>
53 #include <sys/vnode.h>
54 #include <sys/file.h>
55 #include <sys/callout.h>
56 #include <sys/mbuf.h>
57 #include <ufs/ufs/quota.h>
58 #include <sys/kernel.h>
59 #include <sys/utsname.h>
60 #ifdef SYSVSHM
61 #include <machine/vmparam.h>
62 #include <sys/shm.h>
63 #endif
64 #ifdef SYSVSEM
65 #include <sys/sem.h>
66 #endif
67 #ifdef SYSVMSG
68 #include <sys/msg.h>
69 #endif
70
71 #define CONFIG_FILE
72 #include "config_file.h"
73
74 /*
75 * System parameter formulae.
76 *
77 * This file is copied into each directory where we compile
78 * the kernel; it should be modified there to suit local taste
79 * if necessary.
80 *
81 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
82 */
83
84 #ifdef TIMEZONE
85 #error TIMEZONE is an obsolete kernel option.
86 #endif
87
88 #ifdef DST
89 #error DST is an obsolete kernel option.
90 #endif
91
92 #ifndef RTC_OFFSET
93 #define RTC_OFFSET 0
94 #endif
95
96 #ifndef HZ
97 #define HZ 100
98 #endif
99
100 #ifndef MAXFILES
101 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80)
102 #endif
103
104 int hz = HZ;
105 int tick = 1000000 / HZ;
106 /* can adjust 240ms in 60s */
107 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
108 int rtc_offset = RTC_OFFSET;
109 int maxproc = NPROC;
110 int desiredvnodes = NVNODE;
111 int maxfiles = MAXFILES;
112 int ncallout = 16 + NPROC; /* size of callwheel (rounded to ^2) */
113 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
114
115 /*
116 * Various mbuf-related parameters. These can also be changed at run-time
117 * with sysctl.
118 */
119 int nmbclusters = NMBCLUSTERS;
120
121 #ifndef MBLOWAT
122 #define MBLOWAT 16
123 #endif
124 int mblowat = MBLOWAT;
125
126 #ifndef MCLLOWAT
127 #define MCLLOWAT 8
128 #endif
129 int mcllowat = MCLLOWAT;
130
131 /*
132 * Values in support of System V compatible shared memory. XXX
133 */
134 #ifdef SYSVSHM
135 #ifndef SHMMAX
136 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */
137 #endif
138 #ifndef SHMMIN
139 #define SHMMIN 1
140 #endif
141 #ifndef SHMMNI
142 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */
143 #endif
144 #ifndef SHMSEG
145 #define SHMSEG 128
146 #endif
147 #define SHMALL SHMMAXPGS
148
149 struct shminfo shminfo = {
150 SHMMAX,
151 SHMMIN,
152 SHMMNI,
153 SHMSEG,
154 SHMALL
155 };
156 #endif
157
158 /*
159 * Values in support of System V compatible semaphores.
160 */
161 #ifdef SYSVSEM
162 struct seminfo seminfo = {
163 SEMMAP, /* # of entries in semaphore map */
164 SEMMNI, /* # of semaphore identifiers */
165 SEMMNS, /* # of semaphores in system */
166 SEMMNU, /* # of undo structures in system */
167 SEMMSL, /* max # of semaphores per id */
168 SEMOPM, /* max # of operations per semop call */
169 SEMUME, /* max # of undo entries per process */
170 SEMUSZ, /* size in bytes of undo structure */
171 SEMVMX, /* semaphore maximum value */
172 SEMAEM /* adjust on exit max value */
173 };
174 #endif
175
176 /*
177 * Values in support of System V compatible messages.
178 */
179 #ifdef SYSVMSG
180 struct msginfo msginfo = {
181 MSGMAX, /* max chars in a message */
182 MSGMNI, /* # of message queue identifiers */
183 MSGMNB, /* max chars in a queue */
184 MSGTQL, /* max messages in system */
185 MSGSSZ, /* size of a message segment */
186 /* (must be small power of 2 greater than 4) */
187 MSGSEG /* number of message segments */
188 };
189 #endif
190
191 /*
192 * These control when and to what priority a process gets after a certain
193 * amount of CPU time expires. AUTONICETIME is in seconds.
194 * AUTONICEVAL is NOT offset by NZERO, i.e. it's between PRIO_MIN and PRIO_MAX.
195 */
196 #ifndef AUTONICETIME
197 #define AUTONICETIME 0 /* disabled */
198 #endif
199
200 #ifndef AUTONICEVAL
201 #define AUTONICEVAL 4 /* default + 4 */
202 #endif
203
204 int autonicetime = AUTONICETIME;
205 int autoniceval = AUTONICEVAL;
206
207 /*
208 * Actual network mbuf sizes (read-only), for netstat.
209 */
210 const int msize = MSIZE;
211 const int mclbytes = MCLBYTES;
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