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 $ 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 #ifndef NSFBUFS 66 #define NSFBUFS (512 + maxusers * 16) 67 #endif 68 69 int hz; 70 int tick; 71 int tickadj; /* can adjust 30ms in 60s */ 72 int maxusers; /* base tunable */ 73 int maxproc; /* maximum # of processes */ 74 int maxprocperuid; /* max # of procs per user */ 75 int maxfiles; /* sys. wide open files limit */ 76 int maxfilesperproc; /* per-proc open files limit */ 77 int ncallout; /* maximum # of timer events */ 78 int mbuf_wait = 32; /* mbuf sleep time in ticks */ 79 int nbuf; 80 int nswbuf; 81 int maxswzone; /* max swmeta KVA storage */ 82 int maxbcache; /* max buffer cache KVA storage */ 83 u_quad_t maxtsiz; /* max text size */ 84 u_quad_t dfldsiz; /* initial data size limit */ 85 u_quad_t maxdsiz; /* max data size */ 86 u_quad_t dflssiz; /* initial stack size limit */ 87 u_quad_t maxssiz; /* max stack size */ 88 u_quad_t sgrowsiz; /* amount to grow stack */ 89 90 /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ 91 int nsfbufs; 92 93 /* 94 * These have to be allocated somewhere; allocating 95 * them here forces loader errors if this file is omitted 96 * (if they've been externed everywhere else; hah!). 97 */ 98 struct buf *swbuf; 99 100 /* 101 * Boot time overrides that are not scaled against main memory 102 */ 103 void 104 init_param1(void) 105 { 106 hz = HZ; 107 TUNABLE_INT_FETCH("kern.hz", &hz); 108 tick = 1000000 / hz; 109 tickadj = howmany(30000, 60 * hz); /* can adjust 30ms in 60s */ 110 111 #ifdef VM_SWZONE_SIZE_MAX 112 maxswzone = VM_SWZONE_SIZE_MAX; 113 #endif 114 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 115 #ifdef VM_BCACHE_SIZE_MAX 116 maxbcache = VM_BCACHE_SIZE_MAX; 117 #endif 118 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 119 120 maxtsiz = MAXTSIZ; 121 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); 122 dfldsiz = DFLDSIZ; 123 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); 124 maxdsiz = MAXDSIZ; 125 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); 126 dflssiz = DFLSSIZ; 127 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); 128 maxssiz = MAXSSIZ; 129 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); 130 sgrowsiz = SGROWSIZ; 131 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); 132 } 133 134 /* 135 * Boot time overrides that are scaled against main memory 136 */ 137 void 138 init_param2(int physpages) 139 { 140 141 /* Base parameters */ 142 maxusers = MAXUSERS; 143 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 144 if (maxusers == 0) { 145 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 146 if (maxusers < 32) 147 maxusers = 32; 148 if (maxusers > 384) 149 maxusers = 384; 150 } 151 152 /* 153 * The following can be overridden after boot via sysctl. Note: 154 * unless overriden, these macros are ultimately based on maxusers. 155 */ 156 maxproc = NPROC; 157 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 158 /* 159 * Limit maxproc so that kmap entries cannot be exhausted by 160 * processes. 161 */ 162 if (maxproc > (physpages / 12)) 163 maxproc = physpages / 12; 164 maxfiles = MAXFILES; 165 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 166 maxprocperuid = (maxproc * 9) / 10; 167 maxfilesperproc = (maxfiles * 9) / 10; 168 169 /* 170 * Cannot be changed after boot. Unless overriden, NSFBUFS is based 171 * on maxusers and NBUF is typically 0 (auto-sized later). 172 */ 173 nsfbufs = NSFBUFS; 174 TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs); 175 nbuf = NBUF; 176 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 177 178 ncallout = 16 + maxproc + maxfiles; 179 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 180 } 181 182