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 * Boot time overrides that are not scaled against main memory 95 */ 96 void 97 init_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 */ 131 void 132 init_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