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 100 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, 104 "Number of clock ticks per second"); 105 SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 106 "Number of pre-allocated timer events"); 107 SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 108 "Number of buffers in the buffer cache"); 109 SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 110 "Number of swap buffers"); 111 SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 112 "Maximum memory for swap metadata"); 113 SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 114 "Maximum value of vfs.maxbufspace"); 115 SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 116 "Maximum text size"); 117 SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 118 "Initial data size limit"); 119 SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 120 "Maximum data size"); 121 SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 122 "Initial stack size limit"); 123 SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 124 "Maximum stack size"); 125 SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 126 "Amount to grow stack on a stack fault"); 127 SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 128 NULL, 0, sysctl_kern_vm_guest, "A", 129 "Virtual machine detected? (none|generic|xen)"); 130 131 /* 132 * These have to be allocated somewhere; allocating 133 * them here forces loader errors if this file is omitted 134 * (if they've been externed everywhere else; hah!). 135 */ 136 struct buf *swbuf; 137 138 static const char *const vm_guest_sysctl_names[] = { 139 "none", 140 "generic", 141 "xen", 142 NULL 143 }; 144 145 #ifndef XEN 146 static const char *const vm_bnames[] = { 147 "QEMU", /* QEMU */ 148 "Plex86", /* Plex86 */ 149 "Bochs", /* Bochs */ 150 NULL 151 }; 152 153 static const char *const vm_pnames[] = { 154 "VMware Virtual Platform", /* VMWare VM */ 155 "Virtual Machine", /* Microsoft VirtualPC */ 156 "VirtualBox", /* Sun xVM VirtualBox */ 157 "Parallels Virtual Platform", /* Parallels VM */ 158 NULL 159 }; 160 161 162 /* 163 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 164 */ 165 static enum VM_GUEST 166 detect_virtual(void) 167 { 168 char *sysenv; 169 int i; 170 171 sysenv = getenv("smbios.bios.vendor"); 172 if (sysenv != NULL) { 173 for (i = 0; vm_bnames[i] != NULL; i++) 174 if (strcmp(sysenv, vm_bnames[i]) == 0) { 175 freeenv(sysenv); 176 return (VM_GUEST_VM); 177 } 178 freeenv(sysenv); 179 } 180 sysenv = getenv("smbios.system.product"); 181 if (sysenv != NULL) { 182 for (i = 0; vm_pnames[i] != NULL; i++) 183 if (strcmp(sysenv, vm_pnames[i]) == 0) { 184 freeenv(sysenv); 185 return (VM_GUEST_VM); 186 } 187 freeenv(sysenv); 188 } 189 return (VM_GUEST_NO); 190 } 191 #endif 192 193 /* 194 * Boot time overrides that are not scaled against main memory 195 */ 196 void 197 init_param1(void) 198 { 199 #ifndef XEN 200 vm_guest = detect_virtual(); 201 #else 202 vm_guest = VM_GUEST_XEN; 203 #endif 204 hz = -1; 205 TUNABLE_INT_FETCH("kern.hz", &hz); 206 if (hz == -1) 207 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 208 tick = 1000000 / hz; 209 210 #ifdef VM_SWZONE_SIZE_MAX 211 maxswzone = VM_SWZONE_SIZE_MAX; 212 #endif 213 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 214 #ifdef VM_BCACHE_SIZE_MAX 215 maxbcache = VM_BCACHE_SIZE_MAX; 216 #endif 217 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 218 219 maxtsiz = MAXTSIZ; 220 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 221 dfldsiz = DFLDSIZ; 222 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 223 maxdsiz = MAXDSIZ; 224 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 225 dflssiz = DFLSSIZ; 226 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 227 maxssiz = MAXSSIZ; 228 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 229 sgrowsiz = SGROWSIZ; 230 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 231 } 232 233 /* 234 * Boot time overrides that are scaled against main memory 235 */ 236 void 237 init_param2(long physpages) 238 { 239 240 /* Base parameters */ 241 maxusers = MAXUSERS; 242 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 243 if (maxusers == 0) { 244 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 245 if (maxusers < 32) 246 maxusers = 32; 247 if (maxusers > 384) 248 maxusers = 384; 249 } 250 251 /* 252 * The following can be overridden after boot via sysctl. Note: 253 * unless overriden, these macros are ultimately based on maxusers. 254 */ 255 maxproc = NPROC; 256 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 257 /* 258 * Limit maxproc so that kmap entries cannot be exhausted by 259 * processes. 260 */ 261 if (maxproc > (physpages / 12)) 262 maxproc = physpages / 12; 263 maxfiles = MAXFILES; 264 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 265 maxprocperuid = (maxproc * 9) / 10; 266 maxfilesperproc = (maxfiles * 9) / 10; 267 268 /* 269 * Cannot be changed after boot. 270 */ 271 nbuf = NBUF; 272 TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 273 274 ncallout = 16 + maxproc + maxfiles; 275 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 276 } 277 278 /* 279 * Boot time overrides that are scaled against the kmem map 280 */ 281 void 282 init_param3(long kmempages) 283 { 284 285 /* 286 * The default for maxpipekva is max(5% of the kmem map, 512KB). 287 * See sys_pipe.c for more details. 288 */ 289 maxpipekva = (kmempages / 20) * PAGE_SIZE; 290 if (maxpipekva < 512 * 1024) 291 maxpipekva = 512 * 1024; 292 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 293 } 294 295 /* 296 * Sysctl stringiying handler for kern.vm_guest. 297 */ 298 static int 299 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 300 { 301 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 302 strlen(vm_guest_sysctl_names[vm_guest]))); 303 } 304