subr_param.c revision 202143
1139804Simp/*- 21541Srgrimes * Copyright (c) 1980, 1986, 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * (c) UNIX System Laboratories, Inc. 51541Srgrimes * All or some portions of this file are derived from material licensed 61541Srgrimes * to the University of California by American Telephone and Telegraph 71541Srgrimes * Co. or Unix System Laboratories, Inc. and are reproduced herein with 81541Srgrimes * the permission of UNIX System Laboratories, Inc. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 4. Neither the name of the University nor the names of its contributors 191541Srgrimes * may be used to endorse or promote products derived from this software 201541Srgrimes * without specific prior written permission. 211541Srgrimes * 221541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321541Srgrimes * SUCH DAMAGE. 331541Srgrimes * 3414526Shsu * @(#)param.c 8.3 (Berkeley) 8/20/94 351541Srgrimes */ 361541Srgrimes 37116182Sobrien#include <sys/cdefs.h> 38116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/subr_param.c 202143 2010-01-12 07:49:34Z brooks $"); 39116182Sobrien 4014328Speter#include "opt_param.h" 4180418Speter#include "opt_maxusers.h" 4213226Swollman 43202143Sbrooks#include <sys/limits.h> 441541Srgrimes#include <sys/param.h> 4580418Speter#include <sys/systm.h> 4680418Speter#include <sys/kernel.h> 47172696Salfred#include <sys/sysctl.h> 481541Srgrimes 49137393Sdes#include <vm/vm_param.h> 5084783Sps 511541Srgrimes/* 521541Srgrimes * System parameter formulae. 531541Srgrimes */ 541541Srgrimes 551541Srgrimes#ifndef HZ 56145154Smarius# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) 57137307Sphk# define HZ 1000 58137307Sphk# else 59137307Sphk# define HZ 100 60138214Sbms# endif 61184323Ssobomax# ifndef HZ_VM 62195430Ssilby# define HZ_VM 100 63184323Ssobomax# endif 64184323Ssobomax#else 65184323Ssobomax# ifndef HZ_VM 66184323Ssobomax# define HZ_VM HZ 67184323Ssobomax# endif 681541Srgrimes#endif 6980418Speter#define NPROC (20 + 16 * maxusers) 7080418Speter#ifndef NBUF 7180418Speter#define NBUF 0 7280418Speter#endif 7345515Sdes#ifndef MAXFILES 7480418Speter#define MAXFILES (maxproc * 2) 7545515Sdes#endif 768747Sdg 77186619Sivoras/* Values of enum VM_GUEST members are used as indices in 78186619Sivoras * vm_guest_sysctl_names */ 79186619Sivorasenum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN }; 80186252Sivoras 81186286Sivorasstatic int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 82186286Sivoras 8380418Speterint hz; 8480418Speterint tick; 8580418Speterint maxusers; /* base tunable */ 8680418Speterint maxproc; /* maximum # of processes */ 8780418Speterint maxprocperuid; /* max # of procs per user */ 8880418Speterint maxfiles; /* sys. wide open files limit */ 8980418Speterint maxfilesperproc; /* per-proc open files limit */ 9080418Speterint ncallout; /* maximum # of timer events */ 9180418Speterint nbuf; 92202143Sbrooksint ngroups_max; /* max # groups per process */ 9380418Speterint nswbuf; 94189595Sjhblong maxswzone; /* max swmeta KVA storage */ 95189595Sjhblong maxbcache; /* max buffer cache KVA storage */ 96189649Sjhblong maxpipekva; /* Limit on pipe KVA */ 97186286Sivorasint vm_guest; /* Running as virtual machine guest? */ 98137393Sdesu_long maxtsiz; /* max text size */ 99137393Sdesu_long dfldsiz; /* initial data size limit */ 100137393Sdesu_long maxdsiz; /* max data size */ 101137393Sdesu_long dflssiz; /* initial stack size limit */ 102137393Sdesu_long maxssiz; /* max stack size */ 103137393Sdesu_long sgrowsiz; /* amount to grow stack */ 1041541Srgrimes 105190331SjhbSYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 106190331Sjhb "Number of clock ticks per second"); 107189744SjhbSYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 108189744Sjhb "Number of pre-allocated timer events"); 109189744SjhbSYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 110190331Sjhb "Number of buffers in the buffer cache"); 111189744SjhbSYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 112189744Sjhb "Number of swap buffers"); 113189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 114190331Sjhb "Maximum memory for swap metadata"); 115189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 116190331Sjhb "Maximum value of vfs.maxbufspace"); 117178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 118190331Sjhb "Maximum text size"); 119178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 120190331Sjhb "Initial data size limit"); 121178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 122190331Sjhb "Maximum data size"); 123178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 124190331Sjhb "Initial stack size limit"); 125178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 126190331Sjhb "Maximum stack size"); 127178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 128190331Sjhb "Amount to grow stack on a stack fault"); 129186286SivorasSYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 130186286Sivoras NULL, 0, sysctl_kern_vm_guest, "A", 131186286Sivoras "Virtual machine detected? (none|generic|xen)"); 132172696Salfred 1331541Srgrimes/* 1341541Srgrimes * These have to be allocated somewhere; allocating 1351541Srgrimes * them here forces loader errors if this file is omitted 1361541Srgrimes * (if they've been externed everywhere else; hah!). 1371541Srgrimes */ 1389759Sbdestruct buf *swbuf; 13967046Sjasone 140186522Sbzstatic const char *const vm_guest_sysctl_names[] = { 141186522Sbz "none", 142186522Sbz "generic", 143186522Sbz "xen", 144186522Sbz NULL 145186522Sbz}; 146186522Sbz 147186522Sbz#ifndef XEN 148185772Sjkimstatic const char *const vm_bnames[] = { 149185772Sjkim "QEMU", /* QEMU */ 150185772Sjkim "Plex86", /* Plex86 */ 151185772Sjkim "Bochs", /* Bochs */ 152185772Sjkim NULL 153185772Sjkim}; 154185772Sjkim 155184326Ssobomaxstatic const char *const vm_pnames[] = { 156184323Ssobomax "VMware Virtual Platform", /* VMWare VM */ 157184323Ssobomax "Virtual Machine", /* Microsoft VirtualPC */ 158184323Ssobomax "VirtualBox", /* Sun xVM VirtualBox */ 159184323Ssobomax "Parallels Virtual Platform", /* Parallels VM */ 160184323Ssobomax NULL 161184323Ssobomax}; 162184323Ssobomax 163186286Sivoras 164186286Sivoras/* 165186286Sivoras * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 166186286Sivoras */ 167186252Sivorasstatic enum VM_GUEST 168184323Ssobomaxdetect_virtual(void) 169184323Ssobomax{ 170184323Ssobomax char *sysenv; 171184323Ssobomax int i; 172184323Ssobomax 173185772Sjkim sysenv = getenv("smbios.bios.vendor"); 174185772Sjkim if (sysenv != NULL) { 175185772Sjkim for (i = 0; vm_bnames[i] != NULL; i++) 176185772Sjkim if (strcmp(sysenv, vm_bnames[i]) == 0) { 177185772Sjkim freeenv(sysenv); 178186252Sivoras return (VM_GUEST_VM); 179185772Sjkim } 180185772Sjkim freeenv(sysenv); 181185772Sjkim } 182184323Ssobomax sysenv = getenv("smbios.system.product"); 183184323Ssobomax if (sysenv != NULL) { 184185772Sjkim for (i = 0; vm_pnames[i] != NULL; i++) 185185772Sjkim if (strcmp(sysenv, vm_pnames[i]) == 0) { 186185772Sjkim freeenv(sysenv); 187186252Sivoras return (VM_GUEST_VM); 188185772Sjkim } 189185772Sjkim freeenv(sysenv); 190184323Ssobomax } 191186252Sivoras return (VM_GUEST_NO); 192184323Ssobomax} 193186522Sbz#endif 194184323Ssobomax 19567046Sjasone/* 19687546Sdillon * Boot time overrides that are not scaled against main memory 19780418Speter */ 19880418Spetervoid 19987546Sdilloninit_param1(void) 20080418Speter{ 201186252Sivoras#ifndef XEN 202186252Sivoras vm_guest = detect_virtual(); 203186252Sivoras#else 204186252Sivoras vm_guest = VM_GUEST_XEN; 205186252Sivoras#endif 206184323Ssobomax hz = -1; 20780418Speter TUNABLE_INT_FETCH("kern.hz", &hz); 208185772Sjkim if (hz == -1) 209186252Sivoras hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 21080418Speter tick = 1000000 / hz; 21180418Speter 21281986Sdillon#ifdef VM_SWZONE_SIZE_MAX 21381933Sdillon maxswzone = VM_SWZONE_SIZE_MAX; 21481986Sdillon#endif 215189595Sjhb TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 21681986Sdillon#ifdef VM_BCACHE_SIZE_MAX 21781933Sdillon maxbcache = VM_BCACHE_SIZE_MAX; 21881986Sdillon#endif 219189595Sjhb TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 22084783Sps 22184783Sps maxtsiz = MAXTSIZ; 222137393Sdes TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 22384783Sps dfldsiz = DFLDSIZ; 224137393Sdes TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 22584783Sps maxdsiz = MAXDSIZ; 226137393Sdes TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 22784783Sps dflssiz = DFLSSIZ; 228137393Sdes TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 22984783Sps maxssiz = MAXSSIZ; 230137393Sdes TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 23184783Sps sgrowsiz = SGROWSIZ; 232137393Sdes TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 233202143Sbrooks 234202143Sbrooks /* 235202143Sbrooks * Let the administrator set {NGROUPS_MAX}, but disallow values 236202143Sbrooks * less than NGROUPS_MAX which would violate POSIX.1-2008 or 237202143Sbrooks * greater than INT_MAX-1 which would result in overflow. 238202143Sbrooks */ 239202143Sbrooks ngroups_max = NGROUPS_MAX; 240202143Sbrooks TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 241202143Sbrooks if (ngroups_max < NGROUPS_MAX) 242202143Sbrooks ngroups_max = NGROUPS_MAX; 243202143Sbrooks if (ngroups_max > INT_MAX - 1) 244202143Sbrooks ngroups_max = INT_MAX - 1; 24580418Speter} 24687546Sdillon 24787546Sdillon/* 24887546Sdillon * Boot time overrides that are scaled against main memory 24987546Sdillon */ 25087546Sdillonvoid 251102600Speterinit_param2(long physpages) 25287546Sdillon{ 25387546Sdillon 25487546Sdillon /* Base parameters */ 25590274Sdillon maxusers = MAXUSERS; 25690274Sdillon TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 25790274Sdillon if (maxusers == 0) { 25889769Sdillon maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 25987546Sdillon if (maxusers < 32) 26087546Sdillon maxusers = 32; 26189769Sdillon if (maxusers > 384) 26289769Sdillon maxusers = 384; 26387546Sdillon } 26487546Sdillon 26587546Sdillon /* 26687546Sdillon * The following can be overridden after boot via sysctl. Note: 26787546Sdillon * unless overriden, these macros are ultimately based on maxusers. 26887546Sdillon */ 26987546Sdillon maxproc = NPROC; 27087546Sdillon TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 27191780Ssilby /* 27291780Ssilby * Limit maxproc so that kmap entries cannot be exhausted by 27391780Ssilby * processes. 27491780Ssilby */ 27591780Ssilby if (maxproc > (physpages / 12)) 27691780Ssilby maxproc = physpages / 12; 27787546Sdillon maxfiles = MAXFILES; 27887546Sdillon TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 27987817Ssilby maxprocperuid = (maxproc * 9) / 10; 28087817Ssilby maxfilesperproc = (maxfiles * 9) / 10; 281117391Ssilby 282117391Ssilby /* 283117391Ssilby * Cannot be changed after boot. 284117391Ssilby */ 285117391Ssilby nbuf = NBUF; 286117391Ssilby TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 28787546Sdillon 288117391Ssilby ncallout = 16 + maxproc + maxfiles; 289117391Ssilby TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 290117391Ssilby} 291117391Ssilby 292117391Ssilby/* 293180262Salc * Boot time overrides that are scaled against the kmem map 294117391Ssilby */ 295117391Ssilbyvoid 296117391Ssilbyinit_param3(long kmempages) 297117391Ssilby{ 298127612Salc 29987546Sdillon /* 300180262Salc * The default for maxpipekva is max(5% of the kmem map, 512KB). 301127612Salc * See sys_pipe.c for more details. 302117325Ssilby */ 303118764Ssilby maxpipekva = (kmempages / 20) * PAGE_SIZE; 304117325Ssilby if (maxpipekva < 512 * 1024) 305117325Ssilby maxpipekva = 512 * 1024; 306189649Sjhb TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 30787546Sdillon} 308186286Sivoras 309186286Sivoras/* 310186286Sivoras * Sysctl stringiying handler for kern.vm_guest. 311186286Sivoras */ 312186286Sivorasstatic int 313186286Sivorassysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 314186286Sivoras{ 315186286Sivoras return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 316186286Sivoras strlen(vm_guest_sysctl_names[vm_guest]))); 317186286Sivoras} 318