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 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include "opt_param.h" 45 #include "opt_maxusers.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 51 #include <machine/vmparam.h> 52 53 /* 54 * System parameter formulae. 55 */ 56 57 #ifndef HZ 58 #ifdef __amd64__ 59 #define HZ 1024 60 #else 61 #define HZ 100 62 #endif 63 #endif 64 #define NPROC (20 + 16 * maxusers) 65 #ifndef NBUF 66 #define NBUF 0 67 #endif 68 #ifndef MAXFILES 69 #define MAXFILES (maxproc * 2) 70 #endif 71 72 int hz; 73 int tick; 74 int maxusers; /* base tunable */ 75 int maxproc; /* maximum # of processes */ 76 int maxprocperuid; /* max # of procs per user */ 77 int maxfiles; /* sys. wide open files limit */ 78 int maxfilesperproc; /* per-proc open files limit */ 79 int ncallout; /* maximum # of timer events */ 80 int nbuf; 81 int nswbuf; 82 int maxswzone; /* max swmeta KVA storage */ 83 int maxbcache; /* max buffer cache KVA storage */ 84 int maxpipekva; /* Limit on pipe KVA */ 85 u_quad_t maxtsiz; /* max text size */ 86 u_quad_t dfldsiz; /* initial data size limit */ 87 u_quad_t maxdsiz; /* max data size */ 88 u_quad_t dflssiz; /* initial stack size limit */ 89 u_quad_t maxssiz; /* max stack size */ 90 u_quad_t sgrowsiz; /* amount to grow stack */ 91 92 /* 93 * These have to be allocated somewhere; allocating 94 * them here forces loader errors if this file is omitted 95 * (if they've been externed everywhere else; hah!). 96 */ 97 struct buf *swbuf; 98 99 /* 100 * Boot time overrides that are not scaled against main memory 101 */ 102 void 103 init_param1(void) 104 { 105 106 hz = HZ; 107 TUNABLE_INT_FETCH("kern.hz", &hz); 108 tick = 1000000 / hz; 109 110 #ifdef VM_SWZONE_SIZE_MAX 111 maxswzone = VM_SWZONE_SIZE_MAX; 112 #endif 113 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 114 #ifdef VM_BCACHE_SIZE_MAX 115 maxbcache = VM_BCACHE_SIZE_MAX; 116 #endif 117 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 118 119 maxtsiz = MAXTSIZ; 120 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); 121 dfldsiz = DFLDSIZ; 122 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); 123 maxdsiz = MAXDSIZ; 124 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); 125 dflssiz = DFLSSIZ; 126 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); 127 maxssiz = MAXSSIZ; 128 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); 129 sgrowsiz = SGROWSIZ; 130 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); 131 } 132 133 /* 134 * Boot time overrides that are scaled against main memory 135 */ 136 void 137 init_param2(long physpages) 138 { 139 140 /* Base parameters */ 141 maxusers = MAXUSERS; 142 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 143 if (maxusers == 0) { 144 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 145 if (maxusers < 32) 146 maxusers = 32; 147 if (maxusers > 384) 148 maxusers = 384; 149 } 150 151 /* 152 * The following can be overridden after boot via sysctl. Note: 153 * unless overriden, these macros are ultimately based on maxusers. 154 */ 155 maxproc = NPROC; 156 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 157 /* 158 * Limit maxproc so that kmap entries cannot be exhausted by 159 * processes. 160 */ 161 if (maxproc > (physpages / 12)) 162 maxproc = physpages / 12; 163 maxfiles = MAXFILES; 164 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 165 maxprocperuid = (maxproc * 9) / 10; 166 maxfilesperproc = (maxfiles * 9) / 10; 167 168 /* 169 * Cannot be changed after boot. 170 */ 171 nbuf = NBUF; 172 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 173 174 ncallout = 16 + maxproc + maxfiles; 175 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 176 } 177 178 /* 179 * Boot time overrides that are scaled against the kernel map 180 */ 181 void 182 init_param3(long kmempages) 183 { 184 185 /* 186 * The default for maxpipekva is max(5% of the kernel map, 512KB). 187 * See sys_pipe.c for more details. 188 */ 189 maxpipekva = (kmempages / 20) * PAGE_SIZE; 190 if (maxpipekva < 512 * 1024) 191 maxpipekva = 512 * 1024; 192 TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 193 } 194