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 /* Values of enum VM_GUEST members are used as indices in 77 * vm_guest_sysctl_names */ 78 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN }; 79 80 static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 81 82 int hz; 83 int tick; 84 int maxusers; /* base tunable */ 85 int maxproc; /* maximum # of processes */ 86 int maxprocperuid; /* max # of procs per user */ 87 int maxfiles; /* sys. wide open files limit */ 88 int maxfilesperproc; /* per-proc open files limit */ 89 int ncallout; /* maximum # of timer events */ 90 int nbuf; 91 int nswbuf; 92 int maxswzone; /* max swmeta KVA storage */ 93 int maxbcache; /* max buffer cache KVA storage */ 94 int maxpipekva; /* Limit on pipe KVA */ 95 int vm_guest; /* Running as virtual machine guest? */ 96 u_long maxtsiz; /* max text size */ 97 u_long dfldsiz; /* initial data size limit */ 98 u_long maxdsiz; /* max data size */ 99 u_long dflssiz; /* initial stack size limit */ 100 u_long maxssiz; /* max stack size */ 101 u_long sgrowsiz; /* amount to grow stack */ 102 103 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "ticks/second"); 104 SYSCTL_INT(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 105 "max swmeta KVA storage"); 106 SYSCTL_INT(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 107 "max buffer cache KVA storage"); 108 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 109 "max text size"); 110 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 111 "initial data size limit"); 112 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 113 "max data size"); 114 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 115 "initial stack size limit"); 116 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 117 "max stack size"); 118 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 119 "amount to grow stack"); 120 SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 121 NULL, 0, sysctl_kern_vm_guest, "A", 122 "Virtual machine detected? (none|generic|xen)"); 123 124 /* 125 * These have to be allocated somewhere; allocating 126 * them here forces loader errors if this file is omitted 127 * (if they've been externed everywhere else; hah!). 128 */ 129 struct buf *swbuf; 130 131 static const char *const vm_guest_sysctl_names[] = { 132 "none", 133 "generic", 134 "xen", 135 NULL 136 }; 137 138 #ifndef XEN 139 static const char *const vm_bnames[] = { 140 "QEMU", /* QEMU */ 141 "Plex86", /* Plex86 */ 142 "Bochs", /* Bochs */ 143 NULL 144 }; 145 146 static const char *const vm_pnames[] = { 147 "VMware Virtual Platform", /* VMWare VM */ 148 "Virtual Machine", /* Microsoft VirtualPC */ 149 "VirtualBox", /* Sun xVM VirtualBox */ 150 "Parallels Virtual Platform", /* Parallels VM */ 151 NULL 152 }; 153 154 155 /* 156 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 157 */ 158 static enum VM_GUEST 159 detect_virtual(void) 160 { 161 char *sysenv; 162 int i; 163 164 sysenv = getenv("smbios.bios.vendor"); 165 if (sysenv != NULL) { 166 for (i = 0; vm_bnames[i] != NULL; i++) 167 if (strcmp(sysenv, vm_bnames[i]) == 0) { 168 freeenv(sysenv); 169 return (VM_GUEST_VM); 170 } 171 freeenv(sysenv); 172 } 173 sysenv = getenv("smbios.system.product"); 174 if (sysenv != NULL) { 175 for (i = 0; vm_pnames[i] != NULL; i++) 176 if (strcmp(sysenv, vm_pnames[i]) == 0) { 177 freeenv(sysenv); 178 return (VM_GUEST_VM); 179 } 180 freeenv(sysenv); 181 } 182 return (VM_GUEST_NO); 183 } 184 #endif 185 186 /* 187 * Boot time overrides that are not scaled against main memory 188 */ 189 void 190 init_param1(void) 191 { 192 #ifndef XEN 193 vm_guest = detect_virtual(); 194 #else 195 vm_guest = VM_GUEST_XEN; 196 #endif 197 hz = -1; 198 TUNABLE_INT_FETCH("kern.hz", &hz); 199 if (hz == -1) 200 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 201 tick = 1000000 / hz; 202 203 #ifdef VM_SWZONE_SIZE_MAX 204 maxswzone = VM_SWZONE_SIZE_MAX; 205 #endif 206 TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 207 #ifdef VM_BCACHE_SIZE_MAX 208 maxbcache = VM_BCACHE_SIZE_MAX; 209 #endif 210 TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 211 212 maxtsiz = MAXTSIZ; 213 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 214 dfldsiz = DFLDSIZ; 215 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 216 maxdsiz = MAXDSIZ; 217 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 218 dflssiz = DFLSSIZ; 219 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 220 maxssiz = MAXSSIZ; 221 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 222 sgrowsiz = SGROWSIZ; 223 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 224 } 225 226 /* 227 * Boot time overrides that are scaled against main memory 228 */ 229 void 230 init_param2(long physpages) 231 { 232 233 /* Base parameters */ 234 maxusers = MAXUSERS; 235 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 236 if (maxusers == 0) { 237 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 238 if (maxusers < 32) 239 maxusers = 32; 240 if (maxusers > 384) 241 maxusers = 384; 242 } 243 244 /* 245 * The following can be overridden after boot via sysctl. Note: 246 * unless overriden, these macros are ultimately based on maxusers. 247 */ 248 maxproc = NPROC; 249 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 250 /* 251 * Limit maxproc so that kmap entries cannot be exhausted by 252 * processes. 253 */ 254 if (maxproc > (physpages / 12)) 255 maxproc = physpages / 12; 256 maxfiles = MAXFILES; 257 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 258 maxprocperuid = (maxproc * 9) / 10; 259 maxfilesperproc = (maxfiles * 9) / 10; 260 261 /* 262 * Cannot be changed after boot. 263 */ 264 nbuf = NBUF; 265 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 266 267 ncallout = 16 + maxproc + maxfiles; 268 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 269 } 270 271 /* 272 * Boot time overrides that are scaled against the kmem map 273 */ 274 void 275 init_param3(long kmempages) 276 { 277 278 /* 279 * The default for maxpipekva is max(5% of the kmem map, 512KB). 280 * See sys_pipe.c for more details. 281 */ 282 maxpipekva = (kmempages / 20) * PAGE_SIZE; 283 if (maxpipekva < 512 * 1024) 284 maxpipekva = 512 * 1024; 285 TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 286 } 287 288 /* 289 * Sysctl stringiying handler for kern.vm_guest. 290 */ 291 static int 292 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 293 { 294 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 295 strlen(vm_guest_sysctl_names[vm_guest]))); 296 } 297