subr_param.c revision 186286
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 186286 2008-12-18 15:34:38Z ivoras $"); 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 76186252Sivorasenum VM_GUEST { VM_GUEST_NO, VM_GUEST_VM, VM_GUEST_XEN }; 77186252Sivoras 78186286Sivorasstatic int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 79186286Sivoras 8080418Speterint hz; 8180418Speterint tick; 8280418Speterint maxusers; /* base tunable */ 8380418Speterint maxproc; /* maximum # of processes */ 8480418Speterint maxprocperuid; /* max # of procs per user */ 8580418Speterint maxfiles; /* sys. wide open files limit */ 8680418Speterint maxfilesperproc; /* per-proc open files limit */ 8780418Speterint ncallout; /* maximum # of timer events */ 8880418Speterint nbuf; 8980418Speterint nswbuf; 90151342Skrisint maxswzone; /* max swmeta KVA storage */ 91151342Skrisint maxbcache; /* max buffer cache KVA storage */ 92117325Ssilbyint maxpipekva; /* Limit on pipe KVA */ 93186286Sivorasint vm_guest; /* Running as virtual machine guest? */ 94137393Sdesu_long maxtsiz; /* max text size */ 95137393Sdesu_long dfldsiz; /* initial data size limit */ 96137393Sdesu_long maxdsiz; /* max data size */ 97137393Sdesu_long dflssiz; /* initial stack size limit */ 98137393Sdesu_long maxssiz; /* max stack size */ 99137393Sdesu_long sgrowsiz; /* amount to grow stack */ 1001541Srgrimes 101178872SpjdSYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "ticks/second"); 102178872SpjdSYSCTL_INT(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 103178872Spjd "max swmeta KVA storage"); 104178872SpjdSYSCTL_INT(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 105178872Spjd "max buffer cache KVA storage"); 106178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 107178872Spjd "max text size"); 108178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 109178872Spjd "initial data size limit"); 110178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 111178872Spjd "max data size"); 112178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 113178872Spjd "initial stack size limit"); 114178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 115178872Spjd "max stack size"); 116178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 117178872Spjd "amount to grow stack"); 118186286SivorasSYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 119186286Sivoras NULL, 0, sysctl_kern_vm_guest, "A", 120186286Sivoras "Virtual machine detected? (none|generic|xen)"); 121172696Salfred 1221541Srgrimes/* 1231541Srgrimes * These have to be allocated somewhere; allocating 1241541Srgrimes * them here forces loader errors if this file is omitted 1251541Srgrimes * (if they've been externed everywhere else; hah!). 1261541Srgrimes */ 1279759Sbdestruct buf *swbuf; 12867046Sjasone 129185772Sjkimstatic const char *const vm_bnames[] = { 130185772Sjkim "QEMU", /* QEMU */ 131185772Sjkim "Plex86", /* Plex86 */ 132185772Sjkim "Bochs", /* Bochs */ 133185772Sjkim NULL 134185772Sjkim}; 135185772Sjkim 136184326Ssobomaxstatic const char *const vm_pnames[] = { 137184323Ssobomax "VMware Virtual Platform", /* VMWare VM */ 138184323Ssobomax "Virtual Machine", /* Microsoft VirtualPC */ 139184323Ssobomax "VirtualBox", /* Sun xVM VirtualBox */ 140184323Ssobomax "Parallels Virtual Platform", /* Parallels VM */ 141184323Ssobomax NULL 142184323Ssobomax}; 143184323Ssobomax 144186286Sivorasstatic const char *const vm_guest_sysctl_names[] = { 145186286Sivoras "none", 146186286Sivoras "generic", 147186286Sivoras "xen", 148186286Sivoras NULL 149186286Sivoras}; 150186286Sivoras 151186286Sivoras 152186286Sivoras/* 153186286Sivoras * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 154186286Sivoras */ 155186252Sivorasstatic enum VM_GUEST 156184323Ssobomaxdetect_virtual(void) 157184323Ssobomax{ 158184323Ssobomax char *sysenv; 159184323Ssobomax int i; 160184323Ssobomax 161185772Sjkim sysenv = getenv("smbios.bios.vendor"); 162185772Sjkim if (sysenv != NULL) { 163185772Sjkim for (i = 0; vm_bnames[i] != NULL; i++) 164185772Sjkim if (strcmp(sysenv, vm_bnames[i]) == 0) { 165185772Sjkim freeenv(sysenv); 166186252Sivoras return (VM_GUEST_VM); 167185772Sjkim } 168185772Sjkim freeenv(sysenv); 169185772Sjkim } 170184323Ssobomax sysenv = getenv("smbios.system.product"); 171184323Ssobomax if (sysenv != NULL) { 172185772Sjkim for (i = 0; vm_pnames[i] != NULL; i++) 173185772Sjkim if (strcmp(sysenv, vm_pnames[i]) == 0) { 174185772Sjkim freeenv(sysenv); 175186252Sivoras return (VM_GUEST_VM); 176185772Sjkim } 177185772Sjkim freeenv(sysenv); 178184323Ssobomax } 179186252Sivoras return (VM_GUEST_NO); 180184323Ssobomax} 181184323Ssobomax 18267046Sjasone/* 18387546Sdillon * Boot time overrides that are not scaled against main memory 18480418Speter */ 18580418Spetervoid 18687546Sdilloninit_param1(void) 18780418Speter{ 188186252Sivoras#ifndef XEN 189186252Sivoras vm_guest = detect_virtual(); 190186252Sivoras#else 191186252Sivoras vm_guest = VM_GUEST_XEN; 192186252Sivoras#endif 193184323Ssobomax hz = -1; 19480418Speter TUNABLE_INT_FETCH("kern.hz", &hz); 195185772Sjkim if (hz == -1) 196186252Sivoras hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 19780418Speter tick = 1000000 / hz; 19880418Speter 19981986Sdillon#ifdef VM_SWZONE_SIZE_MAX 20081933Sdillon maxswzone = VM_SWZONE_SIZE_MAX; 20181986Sdillon#endif 202151342Skris TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); 20381986Sdillon#ifdef VM_BCACHE_SIZE_MAX 20481933Sdillon maxbcache = VM_BCACHE_SIZE_MAX; 20581986Sdillon#endif 206151342Skris TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); 20784783Sps 20884783Sps maxtsiz = MAXTSIZ; 209137393Sdes TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 21084783Sps dfldsiz = DFLDSIZ; 211137393Sdes TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 21284783Sps maxdsiz = MAXDSIZ; 213137393Sdes TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 21484783Sps dflssiz = DFLSSIZ; 215137393Sdes TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 21684783Sps maxssiz = MAXSSIZ; 217137393Sdes TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 21884783Sps sgrowsiz = SGROWSIZ; 219137393Sdes TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 22080418Speter} 22187546Sdillon 22287546Sdillon/* 22387546Sdillon * Boot time overrides that are scaled against main memory 22487546Sdillon */ 22587546Sdillonvoid 226102600Speterinit_param2(long physpages) 22787546Sdillon{ 22887546Sdillon 22987546Sdillon /* Base parameters */ 23090274Sdillon maxusers = MAXUSERS; 23190274Sdillon TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 23290274Sdillon if (maxusers == 0) { 23389769Sdillon maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 23487546Sdillon if (maxusers < 32) 23587546Sdillon maxusers = 32; 23689769Sdillon if (maxusers > 384) 23789769Sdillon maxusers = 384; 23887546Sdillon } 23987546Sdillon 24087546Sdillon /* 24187546Sdillon * The following can be overridden after boot via sysctl. Note: 24287546Sdillon * unless overriden, these macros are ultimately based on maxusers. 24387546Sdillon */ 24487546Sdillon maxproc = NPROC; 24587546Sdillon TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 24691780Ssilby /* 24791780Ssilby * Limit maxproc so that kmap entries cannot be exhausted by 24891780Ssilby * processes. 24991780Ssilby */ 25091780Ssilby if (maxproc > (physpages / 12)) 25191780Ssilby maxproc = physpages / 12; 25287546Sdillon maxfiles = MAXFILES; 25387546Sdillon TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 25487817Ssilby maxprocperuid = (maxproc * 9) / 10; 25587817Ssilby maxfilesperproc = (maxfiles * 9) / 10; 256117391Ssilby 257117391Ssilby /* 258117391Ssilby * Cannot be changed after boot. 259117391Ssilby */ 260117391Ssilby nbuf = NBUF; 261117391Ssilby TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 26287546Sdillon 263117391Ssilby ncallout = 16 + maxproc + maxfiles; 264117391Ssilby TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 265117391Ssilby} 266117391Ssilby 267117391Ssilby/* 268180262Salc * Boot time overrides that are scaled against the kmem map 269117391Ssilby */ 270117391Ssilbyvoid 271117391Ssilbyinit_param3(long kmempages) 272117391Ssilby{ 273127612Salc 27487546Sdillon /* 275180262Salc * The default for maxpipekva is max(5% of the kmem map, 512KB). 276127612Salc * See sys_pipe.c for more details. 277117325Ssilby */ 278118764Ssilby maxpipekva = (kmempages / 20) * PAGE_SIZE; 279117325Ssilby if (maxpipekva < 512 * 1024) 280117325Ssilby maxpipekva = 512 * 1024; 281118764Ssilby TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 28287546Sdillon} 283186286Sivoras 284186286Sivoras/* 285186286Sivoras * Sysctl stringiying handler for kern.vm_guest. 286186286Sivoras */ 287186286Sivorasstatic int 288186286Sivorassysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 289186286Sivoras{ 290186286Sivoras return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 291186286Sivoras strlen(vm_guest_sysctl_names[vm_guest]))); 292186286Sivoras} 293