xref: /freebsd/sys/kern/subr_param.c (revision a220d00e74dd245b4fca59c5eca0c53963686325)
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  * $FreeBSD$
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	tickadj;			 /* can adjust 30ms in 60s */
69 int	maxusers;			/* base tunable */
70 int	maxproc;			/* maximum # of processes */
71 int	maxprocperuid;			/* max # of procs per user */
72 int	maxfiles;			/* sys. wide open files limit */
73 int	maxfilesperproc;		/* per-proc open files limit */
74 int	ncallout;			/* maximum # of timer events */
75 int	nbuf;
76 int	nswbuf;
77 int	maxswzone;			/* max swmeta KVA storage */
78 int	maxbcache;			/* max buffer cache KVA storage */
79 u_quad_t	maxtsiz;			/* max text size */
80 u_quad_t	dfldsiz;			/* initial data size limit */
81 u_quad_t	maxdsiz;			/* max data size */
82 u_quad_t	dflssiz;			/* initial stack size limit */
83 u_quad_t	maxssiz;			/* max stack size */
84 u_quad_t	sgrowsiz;			/* amount to grow stack */
85 
86 /*
87  * These have to be allocated somewhere; allocating
88  * them here forces loader errors if this file is omitted
89  * (if they've been externed everywhere else; hah!).
90  */
91 struct	buf *swbuf;
92 
93 /*
94  * Total number of shared mutexes to protect all lockmgr locks.
95  */
96 #ifndef	LOCKMUTEX
97 #define LOCKMUTEX	10
98 #endif
99 int	lock_nmtx = LOCKMUTEX;
100 
101 /*
102  * Boot time overrides
103  */
104 void
105 init_param(void)
106 {
107 
108 	/* Base parameters */
109 	maxusers = MAXUSERS;
110 	TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
111 	hz = HZ;
112 	TUNABLE_INT_FETCH("kern.hz", &hz);
113 	tick = 1000000 / hz;
114 	tickadj = howmany(30000, 60 * hz);	/* can adjust 30ms in 60s */
115 
116 	/* The following can be overridden after boot via sysctl */
117 	maxproc = NPROC;
118 	TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
119 	maxfiles = MAXFILES;
120 	TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
121 	maxprocperuid = maxproc - 1;
122 	maxfilesperproc = maxfiles;
123 
124 	/* Cannot be changed after boot */
125 	nbuf = NBUF;
126 	TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
127 #ifdef VM_SWZONE_SIZE_MAX
128 	maxswzone = VM_SWZONE_SIZE_MAX;
129 #endif
130 	TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
131 #ifdef VM_BCACHE_SIZE_MAX
132 	maxbcache = VM_BCACHE_SIZE_MAX;
133 #endif
134 	TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache);
135 	ncallout = 16 + maxproc + maxfiles;
136 	TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
137 
138 	maxtsiz = MAXTSIZ;
139 	TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
140 	dfldsiz = DFLDSIZ;
141 	TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
142 	maxdsiz = MAXDSIZ;
143 	TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
144 	dflssiz = DFLSSIZ;
145 	TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
146 	maxssiz = MAXSSIZ;
147 	TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
148 	sgrowsiz = SGROWSIZ;
149 	TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
150 }
151