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/limits.h> 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/sysctl.h> 48 49 #include <vm/vm_param.h> 50 51 /* 52 * System parameter formulae. 53 */ 54 55 #ifndef HZ 56 # if defined(__mips__) || defined(__arm__) 57 # define HZ 100 58 # else 59 # define HZ 1000 60 # endif 61 # ifndef HZ_VM 62 # define HZ_VM 100 63 # endif 64 #else 65 # ifndef HZ_VM 66 # define HZ_VM HZ 67 # endif 68 #endif 69 #define NPROC (20 + 16 * maxusers) 70 #ifndef NBUF 71 #define NBUF 0 72 #endif 73 #ifndef MAXFILES 74 #define MAXFILES (maxproc * 2) 75 #endif 76 77 static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 78 79 int hz; 80 int tick; 81 int maxusers; /* base tunable */ 82 int maxproc; /* maximum # of processes */ 83 int maxprocperuid; /* max # of procs per user */ 84 int maxfiles; /* sys. wide open files limit */ 85 int maxfilesperproc; /* per-proc open files limit */ 86 int ncallout; /* maximum # of timer events */ 87 int nbuf; 88 int ngroups_max; /* max # groups per process */ 89 int nswbuf; 90 long maxswzone; /* max swmeta KVA storage */ 91 long maxbcache; /* max buffer cache KVA storage */ 92 long maxpipekva; /* Limit on pipe KVA */ 93 int vm_guest; /* Running as virtual machine guest? */ 94 u_long maxtsiz; /* max text size */ 95 u_long dfldsiz; /* initial data size limit */ 96 u_long maxdsiz; /* max data size */ 97 u_long dflssiz; /* initial stack size limit */ 98 u_long maxssiz; /* max stack size */ 99 u_long sgrowsiz; /* amount to grow stack */ 100 101 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 102 "Number of clock ticks per second"); 103 SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 104 "Number of pre-allocated timer events"); 105 SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 106 "Number of buffers in the buffer cache"); 107 SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 108 "Number of swap buffers"); 109 SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 110 "Maximum memory for swap metadata"); 111 SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 112 "Maximum value of vfs.maxbufspace"); 113 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 114 "Maximum text size"); 115 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 116 "Initial data size limit"); 117 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 118 "Maximum data size"); 119 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 120 "Initial stack size limit"); 121 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 122 "Maximum stack size"); 123 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 124 "Amount to grow stack on a stack fault"); 125 SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 126 NULL, 0, sysctl_kern_vm_guest, "A", 127 "Virtual machine guest detected? (none|generic|xen)"); 128 129 /* 130 * These have to be allocated somewhere; allocating 131 * them here forces loader errors if this file is omitted 132 * (if they've been externed everywhere else; hah!). 133 */ 134 struct buf *swbuf; 135 136 /* 137 * The elements of this array are ordered based upon the values of the 138 * corresponding enum VM_GUEST members. 139 */ 140 static const char *const vm_guest_sysctl_names[] = { 141 "none", 142 "generic", 143 "xen", 144 NULL 145 }; 146 147 #ifndef XEN 148 static const char *const vm_bnames[] = { 149 "QEMU", /* QEMU */ 150 "Plex86", /* Plex86 */ 151 "Bochs", /* Bochs */ 152 "Xen", /* Xen */ 153 NULL 154 }; 155 156 static const char *const vm_pnames[] = { 157 "VMware Virtual Platform", /* VMWare VM */ 158 "Virtual Machine", /* Microsoft VirtualPC */ 159 "VirtualBox", /* Sun xVM VirtualBox */ 160 "Parallels Virtual Platform", /* Parallels VM */ 161 NULL 162 }; 163 164 165 /* 166 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 167 */ 168 static enum VM_GUEST 169 detect_virtual(void) 170 { 171 char *sysenv; 172 int i; 173 174 sysenv = getenv("smbios.bios.vendor"); 175 if (sysenv != NULL) { 176 for (i = 0; vm_bnames[i] != NULL; i++) 177 if (strcmp(sysenv, vm_bnames[i]) == 0) { 178 freeenv(sysenv); 179 return (VM_GUEST_VM); 180 } 181 freeenv(sysenv); 182 } 183 sysenv = getenv("smbios.system.product"); 184 if (sysenv != NULL) { 185 for (i = 0; vm_pnames[i] != NULL; i++) 186 if (strcmp(sysenv, vm_pnames[i]) == 0) { 187 freeenv(sysenv); 188 return (VM_GUEST_VM); 189 } 190 freeenv(sysenv); 191 } 192 return (VM_GUEST_NO); 193 } 194 #endif 195 196 /* 197 * Boot time overrides that are not scaled against main memory 198 */ 199 void 200 init_param1(void) 201 { 202 #ifndef XEN 203 vm_guest = detect_virtual(); 204 #else 205 vm_guest = VM_GUEST_XEN; 206 #endif 207 hz = -1; 208 TUNABLE_INT_FETCH("kern.hz", &hz); 209 if (hz == -1) 210 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 211 tick = 1000000 / hz; 212 213 #ifdef VM_SWZONE_SIZE_MAX 214 maxswzone = VM_SWZONE_SIZE_MAX; 215 #endif 216 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 217 #ifdef VM_BCACHE_SIZE_MAX 218 maxbcache = VM_BCACHE_SIZE_MAX; 219 #endif 220 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 221 222 maxtsiz = MAXTSIZ; 223 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 224 dfldsiz = DFLDSIZ; 225 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 226 maxdsiz = MAXDSIZ; 227 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 228 dflssiz = DFLSSIZ; 229 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 230 maxssiz = MAXSSIZ; 231 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 232 sgrowsiz = SGROWSIZ; 233 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 234 235 /* 236 * Let the administrator set {NGROUPS_MAX}, but disallow values 237 * less than NGROUPS_MAX which would violate POSIX.1-2008 or 238 * greater than INT_MAX-1 which would result in overflow. 239 */ 240 ngroups_max = NGROUPS_MAX; 241 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 242 if (ngroups_max < NGROUPS_MAX) 243 ngroups_max = NGROUPS_MAX; 244 } 245 246 /* 247 * Boot time overrides that are scaled against main memory 248 */ 249 void 250 init_param2(long physpages) 251 { 252 253 /* Base parameters */ 254 maxusers = MAXUSERS; 255 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 256 if (maxusers == 0) { 257 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 258 if (maxusers < 32) 259 maxusers = 32; 260 if (maxusers > 384) 261 maxusers = 384; 262 } 263 264 /* 265 * The following can be overridden after boot via sysctl. Note: 266 * unless overriden, these macros are ultimately based on maxusers. 267 */ 268 maxproc = NPROC; 269 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 270 /* 271 * Limit maxproc so that kmap entries cannot be exhausted by 272 * processes. 273 */ 274 if (maxproc > (physpages / 12)) 275 maxproc = physpages / 12; 276 maxfiles = MAXFILES; 277 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 278 maxprocperuid = (maxproc * 9) / 10; 279 maxfilesperproc = (maxfiles * 9) / 10; 280 281 /* 282 * Cannot be changed after boot. 283 */ 284 nbuf = NBUF; 285 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 286 287 ncallout = 16 + maxproc + maxfiles; 288 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 289 } 290 291 /* 292 * Boot time overrides that are scaled against the kmem map 293 */ 294 void 295 init_param3(long kmempages) 296 { 297 298 /* 299 * The default for maxpipekva is max(5% of the kmem map, 512KB). 300 * See sys_pipe.c for more details. 301 */ 302 maxpipekva = (kmempages / 20) * PAGE_SIZE; 303 if (maxpipekva < 512 * 1024) 304 maxpipekva = 512 * 1024; 305 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 306 } 307 308 /* 309 * Sysctl stringiying handler for kern.vm_guest. 310 */ 311 static int 312 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 313 { 314 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 315 strlen(vm_guest_sysctl_names[vm_guest]))); 316 } 317