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 # ifndef HZ_VM 61 # define HZ_VM 10 62 # endif 63 #else 64 # ifndef HZ_VM 65 # define HZ_VM HZ 66 # endif 67 #endif 68 #define NPROC (20 + 16 * maxusers) 69 #ifndef NBUF 70 #define NBUF 0 71 #endif 72 #ifndef MAXFILES 73 #define MAXFILES (maxproc * 2) 74 #endif 75 76 int hz; 77 int tick; 78 int maxusers; /* base tunable */ 79 int maxproc; /* maximum # of processes */ 80 int maxprocperuid; /* max # of procs per user */ 81 int maxfiles; /* sys. wide open files limit */ 82 int maxfilesperproc; /* per-proc open files limit */ 83 int ncallout; /* maximum # of timer events */ 84 int nbuf; 85 int nswbuf; 86 int maxswzone; /* max swmeta KVA storage */ 87 int maxbcache; /* max buffer cache KVA storage */ 88 int maxpipekva; /* Limit on pipe KVA */ 89 u_long maxtsiz; /* max text size */ 90 u_long dfldsiz; /* initial data size limit */ 91 u_long maxdsiz; /* max data size */ 92 u_long dflssiz; /* initial stack size limit */ 93 u_long maxssiz; /* max stack size */ 94 u_long sgrowsiz; /* amount to grow stack */ 95 96 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "ticks/second"); 97 SYSCTL_INT(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 98 "max swmeta KVA storage"); 99 SYSCTL_INT(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 100 "max buffer cache KVA storage"); 101 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 102 "max text size"); 103 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 104 "initial data size limit"); 105 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 106 "max data size"); 107 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 108 "initial stack size limit"); 109 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 110 "max stack size"); 111 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 112 "amount to grow stack"); 113 114 /* 115 * These have to be allocated somewhere; allocating 116 * them here forces loader errors if this file is omitted 117 * (if they've been externed everywhere else; hah!). 118 */ 119 struct buf *swbuf; 120 121 static const char *const vm_pnames[] = { 122 "VMware Virtual Platform", /* VMWare VM */ 123 "Virtual Machine", /* Microsoft VirtualPC */ 124 "VirtualBox", /* Sun xVM VirtualBox */ 125 "Parallels Virtual Platform", /* Parallels VM */ 126 NULL 127 }; 128 129 static int 130 detect_virtual(void) 131 { 132 char *sysenv; 133 int i; 134 135 sysenv = getenv("smbios.system.product"); 136 if (sysenv != NULL) { 137 for (i = 0; vm_pnames[i] != NULL; i++) { 138 if (strcmp(sysenv, vm_pnames[i]) == 0) 139 return 1; 140 } 141 } 142 return 0; 143 } 144 145 /* 146 * Boot time overrides that are not scaled against main memory 147 */ 148 void 149 init_param1(void) 150 { 151 152 hz = -1; 153 TUNABLE_INT_FETCH("kern.hz", &hz); 154 if (hz == -1) { 155 if (detect_virtual()) { 156 hz = HZ_VM; 157 } else { 158 hz = HZ; 159 } 160 } 161 tick = 1000000 / hz; 162 163 #ifdef VM_SWZONE_SIZE_MAX 164 maxswzone = VM_SWZONE_SIZE_MAX; 165 #endif 166 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 167 #ifdef VM_BCACHE_SIZE_MAX 168 maxbcache = VM_BCACHE_SIZE_MAX; 169 #endif 170 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 171 172 maxtsiz = MAXTSIZ; 173 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 174 dfldsiz = DFLDSIZ; 175 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 176 maxdsiz = MAXDSIZ; 177 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 178 dflssiz = DFLSSIZ; 179 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 180 maxssiz = MAXSSIZ; 181 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 182 sgrowsiz = SGROWSIZ; 183 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 184 } 185 186 /* 187 * Boot time overrides that are scaled against main memory 188 */ 189 void 190 init_param2(long physpages) 191 { 192 193 /* Base parameters */ 194 maxusers = MAXUSERS; 195 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 196 if (maxusers == 0) { 197 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 198 if (maxusers < 32) 199 maxusers = 32; 200 if (maxusers > 384) 201 maxusers = 384; 202 } 203 204 /* 205 * The following can be overridden after boot via sysctl. Note: 206 * unless overriden, these macros are ultimately based on maxusers. 207 */ 208 maxproc = NPROC; 209 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 210 /* 211 * Limit maxproc so that kmap entries cannot be exhausted by 212 * processes. 213 */ 214 if (maxproc > (physpages / 12)) 215 maxproc = physpages / 12; 216 maxfiles = MAXFILES; 217 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 218 maxprocperuid = (maxproc * 9) / 10; 219 maxfilesperproc = (maxfiles * 9) / 10; 220 221 /* 222 * Cannot be changed after boot. 223 */ 224 nbuf = NBUF; 225 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 226 227 ncallout = 16 + maxproc + maxfiles; 228 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 229 } 230 231 /* 232 * Boot time overrides that are scaled against the kmem map 233 */ 234 void 235 init_param3(long kmempages) 236 { 237 238 /* 239 * The default for maxpipekva is max(5% of the kmem map, 512KB). 240 * See sys_pipe.c for more details. 241 */ 242 maxpipekva = (kmempages / 20) * PAGE_SIZE; 243 if (maxpipekva < 512 * 1024) 244 maxpipekva = 512 * 1024; 245 TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 246 } 247