FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_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: releng/5.0/sys/kern/subr_param.c 102600 2002-08-30 04:04:37Z peter $
40 */
41
42 #include "opt_param.h"
43 #include "opt_maxusers.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48
49 #include <machine/vmparam.h>
50
51 /*
52 * System parameter formulae.
53 */
54
55 #ifndef HZ
56 #define HZ 100
57 #endif
58 #define NPROC (20 + 16 * maxusers)
59 #ifndef NBUF
60 #define NBUF 0
61 #endif
62 #ifndef MAXFILES
63 #define MAXFILES (maxproc * 2)
64 #endif
65
66 int hz;
67 int tick;
68 int maxusers; /* base tunable */
69 int maxproc; /* maximum # of processes */
70 int maxprocperuid; /* max # of procs per user */
71 int maxfiles; /* sys. wide open files limit */
72 int maxfilesperproc; /* per-proc open files limit */
73 int ncallout; /* maximum # of timer events */
74 int nbuf;
75 int nswbuf;
76 int maxswzone; /* max swmeta KVA storage */
77 int maxbcache; /* max buffer cache KVA storage */
78 u_quad_t maxtsiz; /* max text size */
79 u_quad_t dfldsiz; /* initial data size limit */
80 u_quad_t maxdsiz; /* max data size */
81 u_quad_t dflssiz; /* initial stack size limit */
82 u_quad_t maxssiz; /* max stack size */
83 u_quad_t sgrowsiz; /* amount to grow stack */
84
85 /*
86 * These have to be allocated somewhere; allocating
87 * them here forces loader errors if this file is omitted
88 * (if they've been externed everywhere else; hah!).
89 */
90 struct buf *swbuf;
91
92 /*
93 * Boot time overrides that are not scaled against main memory
94 */
95 void
96 init_param1(void)
97 {
98
99 hz = HZ;
100 TUNABLE_INT_FETCH("kern.hz", &hz);
101 tick = 1000000 / hz;
102
103 #ifdef VM_SWZONE_SIZE_MAX
104 maxswzone = VM_SWZONE_SIZE_MAX;
105 #endif
106 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
107 #ifdef VM_BCACHE_SIZE_MAX
108 maxbcache = VM_BCACHE_SIZE_MAX;
109 #endif
110 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache);
111
112 maxtsiz = MAXTSIZ;
113 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
114 dfldsiz = DFLDSIZ;
115 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
116 maxdsiz = MAXDSIZ;
117 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
118 dflssiz = DFLSSIZ;
119 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
120 maxssiz = MAXSSIZ;
121 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
122 sgrowsiz = SGROWSIZ;
123 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
124 }
125
126 /*
127 * Boot time overrides that are scaled against main memory
128 */
129 void
130 init_param2(long physpages)
131 {
132
133 /* Base parameters */
134 maxusers = MAXUSERS;
135 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
136 if (maxusers == 0) {
137 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
138 if (maxusers < 32)
139 maxusers = 32;
140 if (maxusers > 384)
141 maxusers = 384;
142 }
143
144 /*
145 * The following can be overridden after boot via sysctl. Note:
146 * unless overriden, these macros are ultimately based on maxusers.
147 */
148 maxproc = NPROC;
149 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
150 /*
151 * Limit maxproc so that kmap entries cannot be exhausted by
152 * processes.
153 */
154 if (maxproc > (physpages / 12))
155 maxproc = physpages / 12;
156 maxfiles = MAXFILES;
157 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
158 maxprocperuid = (maxproc * 9) / 10;
159 maxfilesperproc = (maxfiles * 9) / 10;
160
161 /*
162 * Cannot be changed after boot.
163 */
164 nbuf = NBUF;
165 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
166
167 ncallout = 16 + maxproc + maxfiles;
168 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
169 }
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