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 long maxswzone; /* max swmeta KVA storage */ 93 long maxbcache; /* max buffer cache KVA storage */ 94 long 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, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 105 "Number of pre-allocated timer events"); 106 SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 107 "Number of buffer-cache I/O buffers"); 108 SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 109 "Number of swap buffers"); 110 SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 111 "max swmeta KVA storage"); 112 SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 113 "max buffer cache KVA storage"); 114 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 115 "max text size"); 116 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 117 "initial data size limit"); 118 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 119 "max data size"); 120 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 121 "initial stack size limit"); 122 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 123 "max stack size"); 124 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 125 "amount to grow stack"); 126 SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 127 NULL, 0, sysctl_kern_vm_guest, "A", 128 "Virtual machine detected? (none|generic|xen)"); 129 130 /* 131 * These have to be allocated somewhere; allocating 132 * them here forces loader errors if this file is omitted 133 * (if they've been externed everywhere else; hah!). 134 */ 135 struct buf *swbuf; 136 137 static const char *const vm_guest_sysctl_names[] = { 138 "none", 139 "generic", 140 "xen", 141 NULL 142 }; 143 144 #ifndef XEN 145 static const char *const vm_bnames[] = { 146 "QEMU", /* QEMU */ 147 "Plex86", /* Plex86 */ 148 "Bochs", /* Bochs */ 149 NULL 150 }; 151 152 static const char *const vm_pnames[] = { 153 "VMware Virtual Platform", /* VMWare VM */ 154 "Virtual Machine", /* Microsoft VirtualPC */ 155 "VirtualBox", /* Sun xVM VirtualBox */ 156 "Parallels Virtual Platform", /* Parallels VM */ 157 NULL 158 }; 159 160 161 /* 162 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 163 */ 164 static enum VM_GUEST 165 detect_virtual(void) 166 { 167 char *sysenv; 168 int i; 169 170 sysenv = getenv("smbios.bios.vendor"); 171 if (sysenv != NULL) { 172 for (i = 0; vm_bnames[i] != NULL; i++) 173 if (strcmp(sysenv, vm_bnames[i]) == 0) { 174 freeenv(sysenv); 175 return (VM_GUEST_VM); 176 } 177 freeenv(sysenv); 178 } 179 sysenv = getenv("smbios.system.product"); 180 if (sysenv != NULL) { 181 for (i = 0; vm_pnames[i] != NULL; i++) 182 if (strcmp(sysenv, vm_pnames[i]) == 0) { 183 freeenv(sysenv); 184 return (VM_GUEST_VM); 185 } 186 freeenv(sysenv); 187 } 188 return (VM_GUEST_NO); 189 } 190 #endif 191 192 /* 193 * Boot time overrides that are not scaled against main memory 194 */ 195 void 196 init_param1(void) 197 { 198 #ifndef XEN 199 vm_guest = detect_virtual(); 200 #else 201 vm_guest = VM_GUEST_XEN; 202 #endif 203 hz = -1; 204 TUNABLE_INT_FETCH("kern.hz", &hz); 205 if (hz == -1) 206 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 207 tick = 1000000 / hz; 208 209 #ifdef VM_SWZONE_SIZE_MAX 210 maxswzone = VM_SWZONE_SIZE_MAX; 211 #endif 212 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 213 #ifdef VM_BCACHE_SIZE_MAX 214 maxbcache = VM_BCACHE_SIZE_MAX; 215 #endif 216 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 217 218 maxtsiz = MAXTSIZ; 219 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 220 dfldsiz = DFLDSIZ; 221 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 222 maxdsiz = MAXDSIZ; 223 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 224 dflssiz = DFLSSIZ; 225 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 226 maxssiz = MAXSSIZ; 227 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 228 sgrowsiz = SGROWSIZ; 229 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 230 } 231 232 /* 233 * Boot time overrides that are scaled against main memory 234 */ 235 void 236 init_param2(long physpages) 237 { 238 239 /* Base parameters */ 240 maxusers = MAXUSERS; 241 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 242 if (maxusers == 0) { 243 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 244 if (maxusers < 32) 245 maxusers = 32; 246 if (maxusers > 384) 247 maxusers = 384; 248 } 249 250 /* 251 * The following can be overridden after boot via sysctl. Note: 252 * unless overriden, these macros are ultimately based on maxusers. 253 */ 254 maxproc = NPROC; 255 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 256 /* 257 * Limit maxproc so that kmap entries cannot be exhausted by 258 * processes. 259 */ 260 if (maxproc > (physpages / 12)) 261 maxproc = physpages / 12; 262 maxfiles = MAXFILES; 263 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 264 maxprocperuid = (maxproc * 9) / 10; 265 maxfilesperproc = (maxfiles * 9) / 10; 266 267 /* 268 * Cannot be changed after boot. 269 */ 270 nbuf = NBUF; 271 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 272 273 ncallout = 16 + maxproc + maxfiles; 274 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 275 } 276 277 /* 278 * Boot time overrides that are scaled against the kmem map 279 */ 280 void 281 init_param3(long kmempages) 282 { 283 284 /* 285 * The default for maxpipekva is max(5% of the kmem map, 512KB). 286 * See sys_pipe.c for more details. 287 */ 288 maxpipekva = (kmempages / 20) * PAGE_SIZE; 289 if (maxpipekva < 512 * 1024) 290 maxpipekva = 512 * 1024; 291 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 292 } 293 294 /* 295 * Sysctl stringiying handler for kern.vm_guest. 296 */ 297 static int 298 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 299 { 300 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 301 strlen(vm_guest_sysctl_names[vm_guest]))); 302 } 303