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 * $DragonFly: src/sys/kern/subr_param.c,v 1.2 2003/06/17 04:28:41 dillon Exp $ 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 64 #define MAXFILES (maxproc * 2) 65 #endif 66 #ifndef NSFBUFS 67 #define NSFBUFS (512 + maxusers * 16) 68 #endif 69 70 int hz; 71 int tick; 72 int tickadj; /* can adjust 30ms in 60s */ 73 int maxusers; /* base tunable */ 74 int maxproc; /* maximum # of processes */ 75 int maxprocperuid; /* max # of procs per user */ 76 int maxfiles; /* sys. wide open files limit */ 77 int maxfilesperproc; /* per-proc open files limit */ 78 int ncallout; /* maximum # of timer events */ 79 int mbuf_wait = 32; /* mbuf sleep time in ticks */ 80 int nbuf; 81 int nswbuf; 82 int maxswzone; /* max swmeta KVA storage */ 83 int maxbcache; /* max buffer cache KVA storage */ 84 u_quad_t maxtsiz; /* max text size */ 85 u_quad_t dfldsiz; /* initial data size limit */ 86 u_quad_t maxdsiz; /* max data size */ 87 u_quad_t dflssiz; /* initial stack size limit */ 88 u_quad_t maxssiz; /* max stack size */ 89 u_quad_t sgrowsiz; /* amount to grow stack */ 90 91 /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ 92 int nsfbufs; 93 94 /* 95 * These have to be allocated somewhere; allocating 96 * them here forces loader errors if this file is omitted 97 * (if they've been externed everywhere else; hah!). 98 */ 99 struct buf *swbuf; 100 101 /* 102 * Boot time overrides that are not scaled against main memory 103 */ 104 void 105 init_param1(void) 106 { 107 hz = HZ; 108 TUNABLE_INT_FETCH("kern.hz", &hz); 109 tick = 1000000 / hz; 110 tickadj = howmany(30000, 60 * hz); /* can adjust 30ms in 60s */ 111 112 #ifdef VM_SWZONE_SIZE_MAX 113 maxswzone = VM_SWZONE_SIZE_MAX; 114 #endif 115 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 116 #ifdef VM_BCACHE_SIZE_MAX 117 maxbcache = VM_BCACHE_SIZE_MAX; 118 #endif 119 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 120 121 maxtsiz = MAXTSIZ; 122 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); 123 dfldsiz = DFLDSIZ; 124 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); 125 maxdsiz = MAXDSIZ; 126 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); 127 dflssiz = DFLSSIZ; 128 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); 129 maxssiz = MAXSSIZ; 130 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); 131 sgrowsiz = SGROWSIZ; 132 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); 133 } 134 135 /* 136 * Boot time overrides that are scaled against main memory 137 */ 138 void 139 init_param2(int physpages) 140 { 141 142 /* Base parameters */ 143 maxusers = MAXUSERS; 144 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 145 if (maxusers == 0) { 146 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 147 if (maxusers < 32) 148 maxusers = 32; 149 if (maxusers > 384) 150 maxusers = 384; 151 } 152 153 /* 154 * The following can be overridden after boot via sysctl. Note: 155 * unless overriden, these macros are ultimately based on maxusers. 156 */ 157 maxproc = NPROC; 158 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 159 /* 160 * Limit maxproc so that kmap entries cannot be exhausted by 161 * processes. 162 */ 163 if (maxproc > (physpages / 12)) 164 maxproc = physpages / 12; 165 maxfiles = MAXFILES; 166 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 167 maxprocperuid = (maxproc * 9) / 10; 168 maxfilesperproc = (maxfiles * 9) / 10; 169 170 /* 171 * Cannot be changed after boot. Unless overriden, NSFBUFS is based 172 * on maxusers and NBUF is typically 0 (auto-sized later). 173 */ 174 nsfbufs = NSFBUFS; 175 TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs); 176 nbuf = NBUF; 177 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 178 179 ncallout = 16 + maxproc + maxfiles; 180 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 181 } 182 183