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 #include <sys/sysctl.h> 47 48 #include <vm/vm_param.h> 49 50 /* 51 * System parameter formulae. 52 */ 53 54 #ifndef HZ 55 # if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) 56 # define HZ 1000 57 # else 58 # define HZ 100 59 # endif 60 #endif 61 #define NPROC (20 + 16 * maxusers) 62 #ifndef NBUF 63 #define NBUF 0 64 #endif 65 #ifndef MAXFILES 66 #define MAXFILES (maxproc * 2) 67 #endif 68 69 int hz; 70 int tick; 71 int maxusers; /* base tunable */ 72 int maxproc; /* maximum # of processes */ 73 int maxprocperuid; /* max # of procs per user */ 74 int maxfiles; /* sys. wide open files limit */ 75 int maxfilesperproc; /* per-proc open files limit */ 76 int ncallout; /* maximum # of timer events */ 77 int nbuf; 78 int nswbuf; 79 int maxswzone; /* max swmeta KVA storage */ 80 int maxbcache; /* max buffer cache KVA storage */ 81 int maxpipekva; /* Limit on pipe KVA */ 82 u_long maxtsiz; /* max text size */ 83 u_long dfldsiz; /* initial data size limit */ 84 u_long maxdsiz; /* max data size */ 85 u_long dflssiz; /* initial stack size limit */ 86 u_long maxssiz; /* max stack size */ 87 u_long sgrowsiz; /* amount to grow stack */ 88 89 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "ticks/second"); 90 SYSCTL_INT(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 91 "max swmeta KVA storage"); 92 SYSCTL_INT(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 93 "max buffer cache KVA storage"); 94 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 95 "max text size"); 96 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 97 "initial data size limit"); 98 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 99 "max data size"); 100 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 101 "initial stack size limit"); 102 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 103 "max stack size"); 104 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 105 "amount to grow stack"); 106 107 /* 108 * These have to be allocated somewhere; allocating 109 * them here forces loader errors if this file is omitted 110 * (if they've been externed everywhere else; hah!). 111 */ 112 struct buf *swbuf; 113 114 /* 115 * Boot time overrides that are not scaled against main memory 116 */ 117 void 118 init_param1(void) 119 { 120 121 hz = HZ; 122 TUNABLE_INT_FETCH("kern.hz", &hz); 123 tick = 1000000 / hz; 124 125 #ifdef VM_SWZONE_SIZE_MAX 126 maxswzone = VM_SWZONE_SIZE_MAX; 127 #endif 128 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 129 #ifdef VM_BCACHE_SIZE_MAX 130 maxbcache = VM_BCACHE_SIZE_MAX; 131 #endif 132 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 133 134 maxtsiz = MAXTSIZ; 135 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 136 dfldsiz = DFLDSIZ; 137 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 138 maxdsiz = MAXDSIZ; 139 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 140 dflssiz = DFLSSIZ; 141 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 142 maxssiz = MAXSSIZ; 143 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 144 sgrowsiz = SGROWSIZ; 145 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 146 } 147 148 /* 149 * Boot time overrides that are scaled against main memory 150 */ 151 void 152 init_param2(long physpages) 153 { 154 155 /* Base parameters */ 156 maxusers = MAXUSERS; 157 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 158 if (maxusers == 0) { 159 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 160 if (maxusers < 32) 161 maxusers = 32; 162 if (maxusers > 384) 163 maxusers = 384; 164 } 165 166 /* 167 * The following can be overridden after boot via sysctl. Note: 168 * unless overriden, these macros are ultimately based on maxusers. 169 */ 170 maxproc = NPROC; 171 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 172 /* 173 * Limit maxproc so that kmap entries cannot be exhausted by 174 * processes. 175 */ 176 if (maxproc > (physpages / 12)) 177 maxproc = physpages / 12; 178 maxfiles = MAXFILES; 179 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 180 maxprocperuid = (maxproc * 9) / 10; 181 maxfilesperproc = (maxfiles * 9) / 10; 182 183 /* 184 * Cannot be changed after boot. 185 */ 186 nbuf = NBUF; 187 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 188 189 ncallout = 16 + maxproc + maxfiles; 190 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 191 } 192 193 /* 194 * Boot time overrides that are scaled against the kmem map 195 */ 196 void 197 init_param3(long kmempages) 198 { 199 200 /* 201 * The default for maxpipekva is max(5% of the kmem map, 512KB). 202 * See sys_pipe.c for more details. 203 */ 204 maxpipekva = (kmempages / 20) * PAGE_SIZE; 205 if (maxpipekva < 512 * 1024) 206 maxpipekva = 512 * 1024; 207 TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 208 } 209