subr_param.c revision 239582
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: stable/9/sys/kern/subr_param.c 239582 2012-08-22 19:53:33Z kib $"); 39116182Sobrien 4014328Speter#include "opt_param.h" 41217688Spluknet#include "opt_msgbuf.h" 4280418Speter#include "opt_maxusers.h" 4313226Swollman 441541Srgrimes#include <sys/param.h> 4580418Speter#include <sys/systm.h> 4680418Speter#include <sys/kernel.h> 47239582Skib#include <sys/limits.h> 48239582Skib#include <sys/msgbuf.h> 49172696Salfred#include <sys/sysctl.h> 50239582Skib#include <sys/proc.h> 511541Srgrimes 52219920Salc#include <vm/vm.h> 53137393Sdes#include <vm/vm_param.h> 54219920Salc#include <vm/pmap.h> 5584783Sps 561541Srgrimes/* 571541Srgrimes * System parameter formulae. 581541Srgrimes */ 591541Srgrimes 601541Srgrimes#ifndef HZ 61209492Snwhitehorn# if defined(__mips__) || defined(__arm__) 62209492Snwhitehorn# define HZ 100 63209492Snwhitehorn# else 64137307Sphk# define HZ 1000 65138214Sbms# endif 66184323Ssobomax# ifndef HZ_VM 67195430Ssilby# define HZ_VM 100 68184323Ssobomax# endif 69184323Ssobomax#else 70184323Ssobomax# ifndef HZ_VM 71184323Ssobomax# define HZ_VM HZ 72184323Ssobomax# endif 731541Srgrimes#endif 7480418Speter#define NPROC (20 + 16 * maxusers) 7580418Speter#ifndef NBUF 7680418Speter#define NBUF 0 7780418Speter#endif 7845515Sdes#ifndef MAXFILES 7980418Speter#define MAXFILES (maxproc * 2) 8045515Sdes#endif 818747Sdg 82186286Sivorasstatic int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); 83186286Sivoras 8480418Speterint hz; 8580418Speterint tick; 8680418Speterint maxusers; /* base tunable */ 8780418Speterint maxproc; /* maximum # of processes */ 8880418Speterint maxprocperuid; /* max # of procs per user */ 8980418Speterint maxfiles; /* sys. wide open files limit */ 9080418Speterint maxfilesperproc; /* per-proc open files limit */ 91217688Spluknetint msgbufsize; /* size of kernel message buffer */ 9280418Speterint ncallout; /* maximum # of timer events */ 9380418Speterint nbuf; 94202143Sbrooksint ngroups_max; /* max # groups per process */ 9580418Speterint nswbuf; 96239582Skibpid_t pid_max = PID_MAX; 97189595Sjhblong maxswzone; /* max swmeta KVA storage */ 98189595Sjhblong maxbcache; /* max buffer cache KVA storage */ 99189649Sjhblong maxpipekva; /* Limit on pipe KVA */ 100186286Sivorasint vm_guest; /* Running as virtual machine guest? */ 101137393Sdesu_long maxtsiz; /* max text size */ 102137393Sdesu_long dfldsiz; /* initial data size limit */ 103137393Sdesu_long maxdsiz; /* max data size */ 104137393Sdesu_long dflssiz; /* initial stack size limit */ 105137393Sdesu_long maxssiz; /* max stack size */ 106137393Sdesu_long sgrowsiz; /* amount to grow stack */ 1071541Srgrimes 108190331SjhbSYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 109190331Sjhb "Number of clock ticks per second"); 110189744SjhbSYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 111189744Sjhb "Number of pre-allocated timer events"); 112189744SjhbSYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 113190331Sjhb "Number of buffers in the buffer cache"); 114189744SjhbSYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 115189744Sjhb "Number of swap buffers"); 116217688SpluknetSYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN, &msgbufsize, 0, 117217688Spluknet "Size of the kernel message buffer"); 118189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 119190331Sjhb "Maximum memory for swap metadata"); 120189745SjhbSYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 121190331Sjhb "Maximum value of vfs.maxbufspace"); 122178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, 123190331Sjhb "Maximum text size"); 124178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, 125190331Sjhb "Initial data size limit"); 126178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, 127190331Sjhb "Maximum data size"); 128178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, 129190331Sjhb "Initial stack size limit"); 130178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, 131190331Sjhb "Maximum stack size"); 132178872SpjdSYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, 133190331Sjhb "Amount to grow stack on a stack fault"); 134186286SivorasSYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 135186286Sivoras NULL, 0, sysctl_kern_vm_guest, "A", 136204611Sivoras "Virtual machine guest detected? (none|generic|xen)"); 137172696Salfred 1381541Srgrimes/* 1391541Srgrimes * These have to be allocated somewhere; allocating 1401541Srgrimes * them here forces loader errors if this file is omitted 1411541Srgrimes * (if they've been externed everywhere else; hah!). 1421541Srgrimes */ 1439759Sbdestruct buf *swbuf; 14467046Sjasone 145204420Salc/* 146204420Salc * The elements of this array are ordered based upon the values of the 147204420Salc * corresponding enum VM_GUEST members. 148204420Salc */ 149186522Sbzstatic const char *const vm_guest_sysctl_names[] = { 150186522Sbz "none", 151186522Sbz "generic", 152186522Sbz "xen", 153186522Sbz NULL 154186522Sbz}; 155186522Sbz 156186522Sbz#ifndef XEN 157185772Sjkimstatic const char *const vm_bnames[] = { 158185772Sjkim "QEMU", /* QEMU */ 159185772Sjkim "Plex86", /* Plex86 */ 160185772Sjkim "Bochs", /* Bochs */ 161210935Scsjp "Xen", /* Xen */ 162185772Sjkim NULL 163185772Sjkim}; 164185772Sjkim 165184326Ssobomaxstatic const char *const vm_pnames[] = { 166184323Ssobomax "VMware Virtual Platform", /* VMWare VM */ 167184323Ssobomax "Virtual Machine", /* Microsoft VirtualPC */ 168184323Ssobomax "VirtualBox", /* Sun xVM VirtualBox */ 169184323Ssobomax "Parallels Virtual Platform", /* Parallels VM */ 170184323Ssobomax NULL 171184323Ssobomax}; 172184323Ssobomax 173186286Sivoras 174186286Sivoras/* 175186286Sivoras * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 176186286Sivoras */ 177186252Sivorasstatic enum VM_GUEST 178184323Ssobomaxdetect_virtual(void) 179184323Ssobomax{ 180184323Ssobomax char *sysenv; 181184323Ssobomax int i; 182184323Ssobomax 183185772Sjkim sysenv = getenv("smbios.bios.vendor"); 184185772Sjkim if (sysenv != NULL) { 185185772Sjkim for (i = 0; vm_bnames[i] != NULL; i++) 186185772Sjkim if (strcmp(sysenv, vm_bnames[i]) == 0) { 187185772Sjkim freeenv(sysenv); 188186252Sivoras return (VM_GUEST_VM); 189185772Sjkim } 190185772Sjkim freeenv(sysenv); 191185772Sjkim } 192184323Ssobomax sysenv = getenv("smbios.system.product"); 193184323Ssobomax if (sysenv != NULL) { 194185772Sjkim for (i = 0; vm_pnames[i] != NULL; i++) 195185772Sjkim if (strcmp(sysenv, vm_pnames[i]) == 0) { 196185772Sjkim freeenv(sysenv); 197186252Sivoras return (VM_GUEST_VM); 198185772Sjkim } 199185772Sjkim freeenv(sysenv); 200184323Ssobomax } 201186252Sivoras return (VM_GUEST_NO); 202184323Ssobomax} 203186522Sbz#endif 204184323Ssobomax 20567046Sjasone/* 20687546Sdillon * Boot time overrides that are not scaled against main memory 20780418Speter */ 20880418Spetervoid 20987546Sdilloninit_param1(void) 21080418Speter{ 211186252Sivoras#ifndef XEN 212186252Sivoras vm_guest = detect_virtual(); 213186252Sivoras#else 214186252Sivoras vm_guest = VM_GUEST_XEN; 215186252Sivoras#endif 216184323Ssobomax hz = -1; 21780418Speter TUNABLE_INT_FETCH("kern.hz", &hz); 218185772Sjkim if (hz == -1) 219186252Sivoras hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 22080418Speter tick = 1000000 / hz; 22180418Speter 22281986Sdillon#ifdef VM_SWZONE_SIZE_MAX 22381933Sdillon maxswzone = VM_SWZONE_SIZE_MAX; 22481986Sdillon#endif 225189595Sjhb TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 22681986Sdillon#ifdef VM_BCACHE_SIZE_MAX 22781933Sdillon maxbcache = VM_BCACHE_SIZE_MAX; 22881986Sdillon#endif 229189595Sjhb TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 230217688Spluknet msgbufsize = MSGBUF_SIZE; 231217688Spluknet TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize); 23284783Sps 23384783Sps maxtsiz = MAXTSIZ; 234137393Sdes TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 23584783Sps dfldsiz = DFLDSIZ; 236137393Sdes TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 23784783Sps maxdsiz = MAXDSIZ; 238137393Sdes TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 23984783Sps dflssiz = DFLSSIZ; 240137393Sdes TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 24184783Sps maxssiz = MAXSSIZ; 242137393Sdes TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 24384783Sps sgrowsiz = SGROWSIZ; 244137393Sdes TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 245202143Sbrooks 246202143Sbrooks /* 247202143Sbrooks * Let the administrator set {NGROUPS_MAX}, but disallow values 248202143Sbrooks * less than NGROUPS_MAX which would violate POSIX.1-2008 or 249202143Sbrooks * greater than INT_MAX-1 which would result in overflow. 250202143Sbrooks */ 251202143Sbrooks ngroups_max = NGROUPS_MAX; 252202143Sbrooks TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 253202143Sbrooks if (ngroups_max < NGROUPS_MAX) 254202143Sbrooks ngroups_max = NGROUPS_MAX; 255239582Skib 256239582Skib /* 257239582Skib * Only allow to lower the maximal pid. 258239582Skib * Prevent setting up a non-bootable system if pid_max is too low. 259239582Skib */ 260239582Skib TUNABLE_INT_FETCH("kern.pid_max", &pid_max); 261239582Skib if (pid_max > PID_MAX) 262239582Skib pid_max = PID_MAX; 263239582Skib else if (pid_max < 300) 264239582Skib pid_max = 300; 26580418Speter} 26687546Sdillon 26787546Sdillon/* 26887546Sdillon * Boot time overrides that are scaled against main memory 26987546Sdillon */ 27087546Sdillonvoid 271102600Speterinit_param2(long physpages) 27287546Sdillon{ 27387546Sdillon 27487546Sdillon /* Base parameters */ 27590274Sdillon maxusers = MAXUSERS; 27690274Sdillon TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 27790274Sdillon if (maxusers == 0) { 27889769Sdillon maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 27987546Sdillon if (maxusers < 32) 28087546Sdillon maxusers = 32; 28189769Sdillon if (maxusers > 384) 28289769Sdillon maxusers = 384; 28387546Sdillon } 28487546Sdillon 28587546Sdillon /* 28687546Sdillon * The following can be overridden after boot via sysctl. Note: 28787546Sdillon * unless overriden, these macros are ultimately based on maxusers. 28887546Sdillon */ 28987546Sdillon maxproc = NPROC; 29087546Sdillon TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 29191780Ssilby /* 29291780Ssilby * Limit maxproc so that kmap entries cannot be exhausted by 29391780Ssilby * processes. 29491780Ssilby */ 29591780Ssilby if (maxproc > (physpages / 12)) 29691780Ssilby maxproc = physpages / 12; 29787546Sdillon maxfiles = MAXFILES; 29887546Sdillon TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 29987817Ssilby maxprocperuid = (maxproc * 9) / 10; 30087817Ssilby maxfilesperproc = (maxfiles * 9) / 10; 301117391Ssilby 302117391Ssilby /* 303117391Ssilby * Cannot be changed after boot. 304117391Ssilby */ 305117391Ssilby nbuf = NBUF; 306117391Ssilby TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 30787546Sdillon 308117391Ssilby ncallout = 16 + maxproc + maxfiles; 309117391Ssilby TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 310117391Ssilby 31187546Sdillon /* 312219920Salc * The default for maxpipekva is min(1/64 of the kernel address space, 313219920Salc * max(1/64 of main memory, 512KB)). See sys_pipe.c for more details. 314117325Ssilby */ 315219920Salc maxpipekva = (physpages / 64) * PAGE_SIZE; 316117325Ssilby if (maxpipekva < 512 * 1024) 317117325Ssilby maxpipekva = 512 * 1024; 318219920Salc if (maxpipekva > (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 64) 319219920Salc maxpipekva = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 320219920Salc 64; 321189649Sjhb TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); 32287546Sdillon} 323186286Sivoras 324186286Sivoras/* 325186286Sivoras * Sysctl stringiying handler for kern.vm_guest. 326186286Sivoras */ 327186286Sivorasstatic int 328186286Sivorassysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) 329186286Sivoras{ 330186286Sivoras return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 331186286Sivoras strlen(vm_guest_sysctl_names[vm_guest]))); 332186286Sivoras} 333