subr_param.c revision 190331
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 190331 2009-03-23 20:18:06Z jhb $"); 39116182Sobrien 4014328Speter#include "opt_param.h" 4180418Speter#include "opt_maxusers.h" 4213226Swollman 431541Srgrimes#include <sys/param.h> 4480418Speter#include <sys/systm.h> 4580418Speter#include <sys/kernel.h> 46172696Salfred#include <sys/sysctl.h> 471541Srgrimes 48137393Sdes#include <vm/vm_param.h> 4984783Sps 501541Srgrimes/* 511541Srgrimes * System parameter formulae. 521541Srgrimes */ 531541Srgrimes 541541Srgrimes#ifndef HZ 55145154Smarius# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) 56137307Sphk# define HZ 1000 57137307Sphk# else 58137307Sphk# define HZ 100 59138214Sbms# endif 60184323Ssobomax# ifndef HZ_VM 61184323Ssobomax# define HZ_VM 10 62184323Ssobomax# endif 63184323Ssobomax#else 64184323Ssobomax# ifndef HZ_VM 65184323Ssobomax# define HZ_VM HZ 66184323Ssobomax# endif 671541Srgrimes#endif 6880418Speter#define NPROC (20 + 16 * maxusers) 6980418Speter#ifndef NBUF 7080418Speter#define NBUF 0 7180418Speter#endif 7245515Sdes#ifndef MAXFILES 7380418Speter#define MAXFILES (maxproc * 2) 7445515Sdes#endif 758747Sdg 76186619Sivoras/* Values of enum VM_GUEST members are used as indices in 77186619Sivoras * vm_guest_sysctl_names */ 78186619Sivorasenum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN }; 79186252Sivoras 80186286Sivorasstatic int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 81186286Sivoras 8280418Speterint hz; 8380418Speterint tick; 8480418Speterint maxusers; /* base tunable */ 8580418Speterint maxproc; /* maximum # of processes */ 8680418Speterint maxprocperuid; /* max # of procs per user */ 8780418Speterint maxfiles; /* sys. wide open files limit */ 8880418Speterint maxfilesperproc; /* per-proc open files limit */ 8980418Speterint ncallout; /* maximum # of timer events */ 9080418Speterint nbuf; 9180418Speterint nswbuf; 92189595Sjhblong maxswzone; /* max swmeta KVA storage */ 93189595Sjhblong maxbcache; /* max buffer cache KVA storage */ 94189649Sjhblong maxpipekva; /* Limit on pipe KVA */ 95186286Sivorasint vm_guest; /* Running as virtual machine guest? */ 96137393Sdesu_long maxtsiz; /* max text size */ 97137393Sdesu_long dfldsiz; /* initial data size limit */ 98137393Sdesu_long maxdsiz; /* max data size */ 99137393Sdesu_long dflssiz; /* initial stack size limit */ 100137393Sdesu_long maxssiz; /* max stack size */ 101137393Sdesu_long sgrowsiz; /* amount to grow stack */ 1021541Srgrimes 103190331SjhbSYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 104190331Sjhb "Number of clock ticks per second"); 105189744SjhbSYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 106189744Sjhb "Number of pre-allocated timer events"); 107189744SjhbSYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 108190331Sjhb "Number of buffers in the buffer cache"); 109189744SjhbSYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 110189744Sjhb "Number of swap buffers"); 111189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 112190331Sjhb "Maximum memory for swap metadata"); 113189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 114190331Sjhb "Maximum value of vfs.maxbufspace"); 115178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 116190331Sjhb "Maximum text size"); 117178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 118190331Sjhb "Initial data size limit"); 119178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 120190331Sjhb "Maximum data size"); 121178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 122190331Sjhb "Initial stack size limit"); 123178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 124190331Sjhb "Maximum stack size"); 125178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 126190331Sjhb "Amount to grow stack on a stack fault"); 127186286SivorasSYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 128186286Sivoras NULL, 0, sysctl_kern_vm_guest, "A", 129186286Sivoras "Virtual machine detected? (none|generic|xen)"); 130172696Salfred 1311541Srgrimes/* 1321541Srgrimes * These have to be allocated somewhere; allocating 1331541Srgrimes * them here forces loader errors if this file is omitted 1341541Srgrimes * (if they've been externed everywhere else; hah!). 1351541Srgrimes */ 1369759Sbdestruct buf *swbuf; 13767046Sjasone 138186522Sbzstatic const char *const vm_guest_sysctl_names[] = { 139186522Sbz "none", 140186522Sbz "generic", 141186522Sbz "xen", 142186522Sbz NULL 143186522Sbz}; 144186522Sbz 145186522Sbz#ifndef XEN 146185772Sjkimstatic const char *const vm_bnames[] = { 147185772Sjkim "QEMU", /* QEMU */ 148185772Sjkim "Plex86", /* Plex86 */ 149185772Sjkim "Bochs", /* Bochs */ 150185772Sjkim NULL 151185772Sjkim}; 152185772Sjkim 153184326Ssobomaxstatic const char *const vm_pnames[] = { 154184323Ssobomax "VMware Virtual Platform", /* VMWare VM */ 155184323Ssobomax "Virtual Machine", /* Microsoft VirtualPC */ 156184323Ssobomax "VirtualBox", /* Sun xVM VirtualBox */ 157184323Ssobomax "Parallels Virtual Platform", /* Parallels VM */ 158184323Ssobomax NULL 159184323Ssobomax}; 160184323Ssobomax 161186286Sivoras 162186286Sivoras/* 163186286Sivoras * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 164186286Sivoras */ 165186252Sivorasstatic enum VM_GUEST 166184323Ssobomaxdetect_virtual(void) 167184323Ssobomax{ 168184323Ssobomax char *sysenv; 169184323Ssobomax int i; 170184323Ssobomax 171185772Sjkim sysenv = getenv("smbios.bios.vendor"); 172185772Sjkim if (sysenv != NULL) { 173185772Sjkim for (i = 0; vm_bnames[i] != NULL; i++) 174185772Sjkim if (strcmp(sysenv, vm_bnames[i]) == 0) { 175185772Sjkim freeenv(sysenv); 176186252Sivoras return (VM_GUEST_VM); 177185772Sjkim } 178185772Sjkim freeenv(sysenv); 179185772Sjkim } 180184323Ssobomax sysenv = getenv("smbios.system.product"); 181184323Ssobomax if (sysenv != NULL) { 182185772Sjkim for (i = 0; vm_pnames[i] != NULL; i++) 183185772Sjkim if (strcmp(sysenv, vm_pnames[i]) == 0) { 184185772Sjkim freeenv(sysenv); 185186252Sivoras return (VM_GUEST_VM); 186185772Sjkim } 187185772Sjkim freeenv(sysenv); 188184323Ssobomax } 189186252Sivoras return (VM_GUEST_NO); 190184323Ssobomax} 191186522Sbz#endif 192184323Ssobomax 19367046Sjasone/* 19487546Sdillon * Boot time overrides that are not scaled against main memory 19580418Speter */ 19680418Spetervoid 19787546Sdilloninit_param1(void) 19880418Speter{ 199186252Sivoras#ifndef XEN 200186252Sivoras vm_guest = detect_virtual(); 201186252Sivoras#else 202186252Sivoras vm_guest = VM_GUEST_XEN; 203186252Sivoras#endif 204184323Ssobomax hz = -1; 20580418Speter TUNABLE_INT_FETCH("kern.hz", &hz); 206185772Sjkim if (hz == -1) 207186252Sivoras hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 20880418Speter tick = 1000000 / hz; 20980418Speter 21081986Sdillon#ifdef VM_SWZONE_SIZE_MAX 21181933Sdillon maxswzone = VM_SWZONE_SIZE_MAX; 21281986Sdillon#endif 213189595Sjhb TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 21481986Sdillon#ifdef VM_BCACHE_SIZE_MAX 21581933Sdillon maxbcache = VM_BCACHE_SIZE_MAX; 21681986Sdillon#endif 217189595Sjhb TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 21884783Sps 21984783Sps maxtsiz = MAXTSIZ; 220137393Sdes TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 22184783Sps dfldsiz = DFLDSIZ; 222137393Sdes TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 22384783Sps maxdsiz = MAXDSIZ; 224137393Sdes TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 22584783Sps dflssiz = DFLSSIZ; 226137393Sdes TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 22784783Sps maxssiz = MAXSSIZ; 228137393Sdes TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 22984783Sps sgrowsiz = SGROWSIZ; 230137393Sdes TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 23180418Speter} 23287546Sdillon 23387546Sdillon/* 23487546Sdillon * Boot time overrides that are scaled against main memory 23587546Sdillon */ 23687546Sdillonvoid 237102600Speterinit_param2(long physpages) 23887546Sdillon{ 23987546Sdillon 24087546Sdillon /* Base parameters */ 24190274Sdillon maxusers = MAXUSERS; 24290274Sdillon TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 24390274Sdillon if (maxusers == 0) { 24489769Sdillon maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 24587546Sdillon if (maxusers < 32) 24687546Sdillon maxusers = 32; 24789769Sdillon if (maxusers > 384) 24889769Sdillon maxusers = 384; 24987546Sdillon } 25087546Sdillon 25187546Sdillon /* 25287546Sdillon * The following can be overridden after boot via sysctl. Note: 25387546Sdillon * unless overriden, these macros are ultimately based on maxusers. 25487546Sdillon */ 25587546Sdillon maxproc = NPROC; 25687546Sdillon TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 25791780Ssilby /* 25891780Ssilby * Limit maxproc so that kmap entries cannot be exhausted by 25991780Ssilby * processes. 26091780Ssilby */ 26191780Ssilby if (maxproc > (physpages / 12)) 26291780Ssilby maxproc = physpages / 12; 26387546Sdillon maxfiles = MAXFILES; 26487546Sdillon TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 26587817Ssilby maxprocperuid = (maxproc * 9) / 10; 26687817Ssilby maxfilesperproc = (maxfiles * 9) / 10; 267117391Ssilby 268117391Ssilby /* 269117391Ssilby * Cannot be changed after boot. 270117391Ssilby */ 271117391Ssilby nbuf = NBUF; 272117391Ssilby TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 27387546Sdillon 274117391Ssilby ncallout = 16 + maxproc + maxfiles; 275117391Ssilby TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 276117391Ssilby} 277117391Ssilby 278117391Ssilby/* 279180262Salc * Boot time overrides that are scaled against the kmem map 280117391Ssilby */ 281117391Ssilbyvoid 282117391Ssilbyinit_param3(long kmempages) 283117391Ssilby{ 284127612Salc 28587546Sdillon /* 286180262Salc * The default for maxpipekva is max(5% of the kmem map, 512KB). 287127612Salc * See sys_pipe.c for more details. 288117325Ssilby */ 289118764Ssilby maxpipekva = (kmempages / 20) * PAGE_SIZE; 290117325Ssilby if (maxpipekva < 512 * 1024) 291117325Ssilby maxpipekva = 512 * 1024; 292189649Sjhb TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 29387546Sdillon} 294186286Sivoras 295186286Sivoras/* 296186286Sivoras * Sysctl stringiying handler for kern.vm_guest. 297186286Sivoras */ 298186286Sivorasstatic int 299186286Sivorassysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 300186286Sivoras{ 301186286Sivoras return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 302186286Sivoras strlen(vm_guest_sysctl_names[vm_guest]))); 303186286Sivoras} 304