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("$FreeBSD$"); 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 <machine/vmparam.h> 48 49 /* 50 * System parameter formulae. 51 */ 52 53 #ifndef HZ 54 #ifdef __amd64__ 55 #define HZ 1024 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 68 int hz; 69 int tick; 70 int maxusers; /* base tunable */ 71 int maxproc; /* maximum # of processes */ 72 int maxprocperuid; /* max # of procs per user */ 73 int maxfiles; /* sys. wide open files limit */ 74 int maxfilesperproc; /* per-proc open files limit */ 75 int ncallout; /* maximum # of timer events */ 76 int nbuf; 77 int nswbuf; 78 int maxswzone; /* max swmeta KVA storage */ 79 int maxbcache; /* max buffer cache KVA storage */ 80 int maxpipekva; /* Limit on pipe KVA */ 81 u_quad_t maxtsiz; /* max text size */ 82 u_quad_t dfldsiz; /* initial data size limit */ 83 u_quad_t maxdsiz; /* max data size */ 84 u_quad_t dflssiz; /* initial stack size limit */ 85 u_quad_t maxssiz; /* max stack size */ 86 u_quad_t 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 */ 93 struct buf *swbuf; 94 95 /* 96 * Boot time overrides that are not scaled against main memory 97 */ 98 void 99 init_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_INT_FETCH("kern.maxswzone", &maxswzone); 110 #ifdef VM_BCACHE_SIZE_MAX 111 maxbcache = VM_BCACHE_SIZE_MAX; 112 #endif 113 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 114 115 maxtsiz = MAXTSIZ; 116 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); 117 dfldsiz = DFLDSIZ; 118 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); 119 maxdsiz = MAXDSIZ; 120 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); 121 dflssiz = DFLSSIZ; 122 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); 123 maxssiz = MAXSSIZ; 124 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); 125 sgrowsiz = SGROWSIZ; 126 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); 127 } 128 129 /* 130 * Boot time overrides that are scaled against main memory 131 */ 132 void 133 init_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 */ 177 void 178 init_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