subr_param.c revision 145154
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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.c 8.3 (Berkeley) 8/20/94 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/kern/subr_param.c 145154 2005-04-16 15:07:41Z marius $"); 39 40#include "opt_param.h" 41#include "opt_maxusers.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/kernel.h> 46 47#include <vm/vm_param.h> 48 49/* 50 * System parameter formulae. 51 */ 52 53#ifndef HZ 54# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) 55# define HZ 1000 56# else 57# define HZ 100 58# endif 59#endif 60#define NPROC (20 + 16 * maxusers) 61#ifndef NBUF 62#define NBUF 0 63#endif 64#ifndef MAXFILES 65#define MAXFILES (maxproc * 2) 66#endif 67 68int hz; 69int tick; 70int maxusers; /* base tunable */ 71int maxproc; /* maximum # of processes */ 72int maxprocperuid; /* max # of procs per user */ 73int maxfiles; /* sys. wide open files limit */ 74int maxfilesperproc; /* per-proc open files limit */ 75int ncallout; /* maximum # of timer events */ 76int nbuf; 77int nswbuf; 78long maxswzone; /* max swmeta KVA storage */ 79long maxbcache; /* max buffer cache KVA storage */ 80int maxpipekva; /* Limit on pipe KVA */ 81u_long maxtsiz; /* max text size */ 82u_long dfldsiz; /* initial data size limit */ 83u_long maxdsiz; /* max data size */ 84u_long dflssiz; /* initial stack size limit */ 85u_long maxssiz; /* max stack size */ 86u_long sgrowsiz; /* amount to grow stack */ 87 88/* 89 * These have to be allocated somewhere; allocating 90 * them here forces loader errors if this file is omitted 91 * (if they've been externed everywhere else; hah!). 92 */ 93struct buf *swbuf; 94 95/* 96 * Boot time overrides that are not scaled against main memory 97 */ 98void 99init_param1(void) 100{ 101 102 hz = HZ; 103 TUNABLE_INT_FETCH("kern.hz", &hz); 104 tick = 1000000 / hz; 105 106#ifdef VM_SWZONE_SIZE_MAX 107 maxswzone = VM_SWZONE_SIZE_MAX; 108#endif 109 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 110#ifdef VM_BCACHE_SIZE_MAX 111 maxbcache = VM_BCACHE_SIZE_MAX; 112#endif 113 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 114 115 maxtsiz = MAXTSIZ; 116 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 117 dfldsiz = DFLDSIZ; 118 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 119 maxdsiz = MAXDSIZ; 120 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 121 dflssiz = DFLSSIZ; 122 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 123 maxssiz = MAXSSIZ; 124 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 125 sgrowsiz = SGROWSIZ; 126 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 127} 128 129/* 130 * Boot time overrides that are scaled against main memory 131 */ 132void 133init_param2(long physpages) 134{ 135 136 /* Base parameters */ 137 maxusers = MAXUSERS; 138 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 139 if (maxusers == 0) { 140 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 141 if (maxusers < 32) 142 maxusers = 32; 143 if (maxusers > 384) 144 maxusers = 384; 145 } 146 147 /* 148 * The following can be overridden after boot via sysctl. Note: 149 * unless overriden, these macros are ultimately based on maxusers. 150 */ 151 maxproc = NPROC; 152 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 153 /* 154 * Limit maxproc so that kmap entries cannot be exhausted by 155 * processes. 156 */ 157 if (maxproc > (physpages / 12)) 158 maxproc = physpages / 12; 159 maxfiles = MAXFILES; 160 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 161 maxprocperuid = (maxproc * 9) / 10; 162 maxfilesperproc = (maxfiles * 9) / 10; 163 164 /* 165 * Cannot be changed after boot. 166 */ 167 nbuf = NBUF; 168 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 169 170 ncallout = 16 + maxproc + maxfiles; 171 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 172} 173 174/* 175 * Boot time overrides that are scaled against the kernel map 176 */ 177void 178init_param3(long kmempages) 179{ 180 181 /* 182 * The default for maxpipekva is max(5% of the kernel map, 512KB). 183 * See sys_pipe.c for more details. 184 */ 185 maxpipekva = (kmempages / 20) * PAGE_SIZE; 186 if (maxpipekva < 512 * 1024) 187 maxpipekva = 512 * 1024; 188 TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 189} 190