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(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) 57 # define HZ 1000 58 # else 59 # define HZ 100 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 /* Values of enum VM_GUEST members are used as indices in 78 * vm_guest_sysctl_names */ 79 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN }; 80 81 static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 82 83 int hz; 84 int tick; 85 int maxusers; /* base tunable */ 86 int maxproc; /* maximum # of processes */ 87 int maxprocperuid; /* max # of procs per user */ 88 int maxfiles; /* sys. wide open files limit */ 89 int maxfilesperproc; /* per-proc open files limit */ 90 int ncallout; /* maximum # of timer events */ 91 int nbuf; 92 int ngroups_max; /* max # groups per process */ 93 int nswbuf; 94 long maxswzone; /* max swmeta KVA storage */ 95 long maxbcache; /* max buffer cache KVA storage */ 96 long maxpipekva; /* Limit on pipe KVA */ 97 int vm_guest; /* Running as virtual machine guest? */ 98 u_long maxtsiz; /* max text size */ 99 u_long dfldsiz; /* initial data size limit */ 100 u_long maxdsiz; /* max data size */ 101 u_long dflssiz; /* initial stack size limit */ 102 u_long maxssiz; /* max stack size */ 103 u_long sgrowsiz; /* amount to grow stack */ 104 105 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 106 "Number of clock ticks per second"); 107 SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 108 "Number of pre-allocated timer events"); 109 SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 110 "Number of buffers in the buffer cache"); 111 SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 112 "Number of swap buffers"); 113 SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 114 "Maximum memory for swap metadata"); 115 SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 116 "Maximum value of vfs.maxbufspace"); 117 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 118 "Maximum text size"); 119 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 120 "Initial data size limit"); 121 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 122 "Maximum data size"); 123 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 124 "Initial stack size limit"); 125 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 126 "Maximum stack size"); 127 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 128 "Amount to grow stack on a stack fault"); 129 SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 130 NULL, 0, sysctl_kern_vm_guest, "A", 131 "Virtual machine detected? (none|generic|xen)"); 132 133 /* 134 * These have to be allocated somewhere; allocating 135 * them here forces loader errors if this file is omitted 136 * (if they've been externed everywhere else; hah!). 137 */ 138 struct buf *swbuf; 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 NULL 153 }; 154 155 static const char *const vm_pnames[] = { 156 "VMware Virtual Platform", /* VMWare VM */ 157 "Virtual Machine", /* Microsoft VirtualPC */ 158 "VirtualBox", /* Sun xVM VirtualBox */ 159 "Parallels Virtual Platform", /* Parallels VM */ 160 NULL 161 }; 162 163 164 /* 165 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 166 */ 167 static enum VM_GUEST 168 detect_virtual(void) 169 { 170 char *sysenv; 171 int i; 172 173 sysenv = getenv("smbios.bios.vendor"); 174 if (sysenv != NULL) { 175 for (i = 0; vm_bnames[i] != NULL; i++) 176 if (strcmp(sysenv, vm_bnames[i]) == 0) { 177 freeenv(sysenv); 178 return (VM_GUEST_VM); 179 } 180 freeenv(sysenv); 181 } 182 sysenv = getenv("smbios.system.product"); 183 if (sysenv != NULL) { 184 for (i = 0; vm_pnames[i] != NULL; i++) 185 if (strcmp(sysenv, vm_pnames[i]) == 0) { 186 freeenv(sysenv); 187 return (VM_GUEST_VM); 188 } 189 freeenv(sysenv); 190 } 191 return (VM_GUEST_NO); 192 } 193 #endif 194 195 /* 196 * Boot time overrides that are not scaled against main memory 197 */ 198 void 199 init_param1(void) 200 { 201 #ifndef XEN 202 vm_guest = detect_virtual(); 203 #else 204 vm_guest = VM_GUEST_XEN; 205 #endif 206 hz = -1; 207 TUNABLE_INT_FETCH("kern.hz", &hz); 208 if (hz == -1) 209 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 210 tick = 1000000 / hz; 211 212 #ifdef VM_SWZONE_SIZE_MAX 213 maxswzone = VM_SWZONE_SIZE_MAX; 214 #endif 215 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 216 #ifdef VM_BCACHE_SIZE_MAX 217 maxbcache = VM_BCACHE_SIZE_MAX; 218 #endif 219 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 220 221 maxtsiz = MAXTSIZ; 222 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 223 dfldsiz = DFLDSIZ; 224 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 225 maxdsiz = MAXDSIZ; 226 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 227 dflssiz = DFLSSIZ; 228 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 229 maxssiz = MAXSSIZ; 230 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 231 sgrowsiz = SGROWSIZ; 232 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 233 234 /* 235 * Let the administrator set {NGROUPS_MAX}, but disallow values 236 * less than NGROUPS_MAX which would violate POSIX.1-2008 or 237 * greater than INT_MAX-1 which would result in overflow. 238 */ 239 ngroups_max = NGROUPS_MAX; 240 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 241 if (ngroups_max < NGROUPS_MAX) 242 ngroups_max = NGROUPS_MAX; 243 if (ngroups_max > INT_MAX - 1) 244 ngroups_max = INT_MAX - 1; 245 } 246 247 /* 248 * Boot time overrides that are scaled against main memory 249 */ 250 void 251 init_param2(long physpages) 252 { 253 254 /* Base parameters */ 255 maxusers = MAXUSERS; 256 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 257 if (maxusers == 0) { 258 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 259 if (maxusers < 32) 260 maxusers = 32; 261 if (maxusers > 384) 262 maxusers = 384; 263 } 264 265 /* 266 * The following can be overridden after boot via sysctl. Note: 267 * unless overriden, these macros are ultimately based on maxusers. 268 */ 269 maxproc = NPROC; 270 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 271 /* 272 * Limit maxproc so that kmap entries cannot be exhausted by 273 * processes. 274 */ 275 if (maxproc > (physpages / 12)) 276 maxproc = physpages / 12; 277 maxfiles = MAXFILES; 278 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 279 maxprocperuid = (maxproc * 9) / 10; 280 maxfilesperproc = (maxfiles * 9) / 10; 281 282 /* 283 * Cannot be changed after boot. 284 */ 285 nbuf = NBUF; 286 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 287 288 ncallout = 16 + maxproc + maxfiles; 289 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 290 } 291 292 /* 293 * Boot time overrides that are scaled against the kmem map 294 */ 295 void 296 init_param3(long kmempages) 297 { 298 299 /* 300 * The default for maxpipekva is max(5% of the kmem map, 512KB). 301 * See sys_pipe.c for more details. 302 */ 303 maxpipekva = (kmempages / 20) * PAGE_SIZE; 304 if (maxpipekva < 512 * 1024) 305 maxpipekva = 512 * 1024; 306 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 307 } 308 309 /* 310 * Sysctl stringiying handler for kern.vm_guest. 311 */ 312 static int 313 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 314 { 315 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 316 strlen(vm_guest_sysctl_names[vm_guest]))); 317 } 318