subr_param.c revision 90274 
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: head/sys/kern/subr_param.c 90274 2002-02-06 01:19:19Z dillon $
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
66int	hz;
67int	tick;
68int	tickadj;			 /* can adjust 30ms in 60s */
69int	maxusers;			/* base tunable */
70int	maxproc;			/* maximum # of processes */
71int	maxprocperuid;			/* max # of procs per user */
72int	maxfiles;			/* sys. wide open files limit */
73int	maxfilesperproc;		/* per-proc open files limit */
74int	ncallout;			/* maximum # of timer events */
75int	nbuf;
76int	nswbuf;
77int	maxswzone;			/* max swmeta KVA storage */
78int	maxbcache;			/* max buffer cache KVA storage */
79u_quad_t	maxtsiz;			/* max text size */
80u_quad_t	dfldsiz;			/* initial data size limit */
81u_quad_t	maxdsiz;			/* max data size */
82u_quad_t	dflssiz;			/* initial stack size limit */
83u_quad_t	maxssiz;			/* max stack size */
84u_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 */
91struct	buf *swbuf;
92
93/*
94 * Boot time overrides that are not scaled against main memory
95 */
96void
97init_param1(void)
98{
99
100	hz = HZ;
101	TUNABLE_INT_FETCH("kern.hz", &hz);
102	tick = 1000000 / hz;
103	tickadj = howmany(30000, 60 * hz);	/* can adjust 30ms in 60s */
104
105#ifdef VM_SWZONE_SIZE_MAX
106	maxswzone = VM_SWZONE_SIZE_MAX;
107#endif
108	TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
109#ifdef VM_BCACHE_SIZE_MAX
110	maxbcache = VM_BCACHE_SIZE_MAX;
111#endif
112	TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache);
113
114	maxtsiz = MAXTSIZ;
115	TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
116	dfldsiz = DFLDSIZ;
117	TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
118	maxdsiz = MAXDSIZ;
119	TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
120	dflssiz = DFLSSIZ;
121	TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
122	maxssiz = MAXSSIZ;
123	TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
124	sgrowsiz = SGROWSIZ;
125	TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
126}
127
128/*
129 * Boot time overrides that are scaled against main memory
130 */
131void
132init_param2(int physpages)
133{
134
135	/* Base parameters */
136	maxusers = MAXUSERS;
137	TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
138	if (maxusers == 0) {
139		maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
140		if (maxusers < 32)
141			maxusers = 32;
142		if (maxusers > 384)
143			maxusers = 384;
144	}
145
146	/*
147	 * The following can be overridden after boot via sysctl.  Note:
148	 * unless overriden, these macros are ultimately based on maxusers.
149	 */
150	maxproc = NPROC;
151	TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
152	maxfiles = MAXFILES;
153	TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
154	maxprocperuid = (maxproc * 9) / 10;
155	maxfilesperproc = (maxfiles * 9) / 10;
156
157	/*
158	 * Cannot be changed after boot.
159	 */
160	nbuf = NBUF;
161	TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
162
163	ncallout = 16 + maxproc + maxfiles;
164	TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
165}
166