kernel - Introduce lightweight buffers
[dragonfly.git] / sys / kern / subr_param.c
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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: src/sys/kern/subr_param.c,v 1.42.2.10 2002/03/09 21:05:47 silby Exp $
a46fac56 40 * $DragonFly: src/sys/kern/subr_param.c,v 1.7 2005/06/26 22:03:22 dillon Exp $
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41 */
42
43#include "opt_param.h"
44#include "opt_maxusers.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/kernel.h>
49
50#include <machine/vmparam.h>
51
52/*
53 * System parameter formulae.
54 */
55
56#ifndef HZ
57#define HZ 100
58#endif
59#define NPROC (20 + 16 * maxusers)
60#ifndef NBUF
61#define NBUF 0
62#endif
63#ifndef MAXFILES
cecd10f5 64#define MAXFILES (maxproc * 16)
984263bc 65#endif
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66#ifndef MAXPOSIXLOCKSPERUID
67#define MAXPOSIXLOCKSPERUID (maxusers * 64) /* Should be a safe value */
68#endif
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69
70int hz;
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71int stathz;
72int profhz;
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73int ustick; /* tick interval in microseconds */
74int nstick; /* tick interval in nanoseconds */
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75int maxusers; /* base tunable */
76int maxproc; /* maximum # of processes */
77int maxprocperuid; /* max # of procs per user */
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78int maxfiles; /* system wide open files limit */
79int maxfilesrootres; /* descriptors reserved for root use */
984263bc 80int maxfilesperproc; /* per-proc open files limit */
508ceb09 81int maxposixlocksperuid; /* max # POSIX locks per uid */
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82int ncallout; /* maximum # of timer events */
83int mbuf_wait = 32; /* mbuf sleep time in ticks */
84int nbuf;
85int nswbuf;
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86long maxswzone; /* max swmeta KVA storage */
87long maxbcache; /* max buffer cache KVA storage */
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88u_quad_t maxtsiz; /* max text size */
89u_quad_t dfldsiz; /* initial data size limit */
90u_quad_t maxdsiz; /* max data size */
91u_quad_t dflssiz; /* initial stack size limit */
92u_quad_t maxssiz; /* max stack size */
93u_quad_t sgrowsiz; /* amount to grow stack */
94
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95/*
96 * These have to be allocated somewhere; allocating
97 * them here forces loader errors if this file is omitted
98 * (if they've been externed everywhere else; hah!).
99 */
100struct buf *swbuf;
101
102/*
103 * Boot time overrides that are not scaled against main memory
104 */
105void
106init_param1(void)
107{
108 hz = HZ;
109 TUNABLE_INT_FETCH("kern.hz", &hz);
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110 stathz = hz * 128 / 100;
111 profhz = stathz;
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112 ustick = 1000000 / hz;
113 nstick = 1000000000 / hz;
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114 /* can adjust 30ms in 60s */
115 ntp_default_tick_delta = howmany(30000000, 60 * hz);
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116
117#ifdef VM_SWZONE_SIZE_MAX
118 maxswzone = VM_SWZONE_SIZE_MAX;
119#endif
79634a66 120 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
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121#ifdef VM_BCACHE_SIZE_MAX
122 maxbcache = VM_BCACHE_SIZE_MAX;
123#endif
79634a66 124 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
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125 maxtsiz = MAXTSIZ;
126 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
127 dfldsiz = DFLDSIZ;
128 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
129 maxdsiz = MAXDSIZ;
130 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
131 dflssiz = DFLSSIZ;
132 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
133 maxssiz = MAXSSIZ;
134 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
135 sgrowsiz = SGROWSIZ;
136 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
137}
138
139/*
140 * Boot time overrides that are scaled against main memory
141 */
142void
143init_param2(int physpages)
144{
145
146 /* Base parameters */
147 maxusers = MAXUSERS;
148 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
149 if (maxusers == 0) {
150 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
151 if (maxusers < 32)
152 maxusers = 32;
153 if (maxusers > 384)
154 maxusers = 384;
155 }
156
157 /*
158 * The following can be overridden after boot via sysctl. Note:
159 * unless overriden, these macros are ultimately based on maxusers.
160 */
161 maxproc = NPROC;
162 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
163 /*
164 * Limit maxproc so that kmap entries cannot be exhausted by
165 * processes.
166 */
167 if (maxproc > (physpages / 12))
168 maxproc = physpages / 12;
169 maxfiles = MAXFILES;
170 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
171 maxprocperuid = (maxproc * 9) / 10;
172 maxfilesperproc = (maxfiles * 9) / 10;
60ee93b9 173 maxfilesrootres = maxfiles / 20;
984263bc 174
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175 maxposixlocksperuid = MAXPOSIXLOCKSPERUID;
176 TUNABLE_INT_FETCH("kern.maxposixlocksperuid", &maxposixlocksperuid);
177
984263bc 178 /*
5c5185ae 179 * Unless overriden, NBUF is typically 0 (auto-sized later).
984263bc 180 */
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181 nbuf = NBUF;
182 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
183
184 ncallout = 16 + maxproc + maxfiles;
185 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
186}
187