subr_param.c revision 139804
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 139804 2005-01-06 23:35:40Z imp $"); 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> 461541Srgrimes 47137393Sdes#include <vm/vm_param.h> 4884783Sps 491541Srgrimes/* 501541Srgrimes * System parameter formulae. 511541Srgrimes */ 521541Srgrimes 531541Srgrimes#ifndef HZ 54138214Sbms# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) 55137307Sphk# define HZ 1000 56137307Sphk# else 57137307Sphk# define HZ 100 58138214Sbms# endif 591541Srgrimes#endif 6080418Speter#define NPROC (20 + 16 * maxusers) 6180418Speter#ifndef NBUF 6280418Speter#define NBUF 0 6380418Speter#endif 6445515Sdes#ifndef MAXFILES 6580418Speter#define MAXFILES (maxproc * 2) 6645515Sdes#endif 678747Sdg 6880418Speterint hz; 6980418Speterint tick; 7080418Speterint maxusers; /* base tunable */ 7180418Speterint maxproc; /* maximum # of processes */ 7280418Speterint maxprocperuid; /* max # of procs per user */ 7380418Speterint maxfiles; /* sys. wide open files limit */ 7480418Speterint maxfilesperproc; /* per-proc open files limit */ 7580418Speterint ncallout; /* maximum # of timer events */ 7680418Speterint nbuf; 7780418Speterint nswbuf; 78137393Sdeslong maxswzone; /* max swmeta KVA storage */ 79137393Sdeslong maxbcache; /* max buffer cache KVA storage */ 80117325Ssilbyint maxpipekva; /* Limit on pipe KVA */ 81137393Sdesu_long maxtsiz; /* max text size */ 82137393Sdesu_long dfldsiz; /* initial data size limit */ 83137393Sdesu_long maxdsiz; /* max data size */ 84137393Sdesu_long dflssiz; /* initial stack size limit */ 85137393Sdesu_long maxssiz; /* max stack size */ 86137393Sdesu_long sgrowsiz; /* amount to grow stack */ 871541Srgrimes 881541Srgrimes/* 891541Srgrimes * These have to be allocated somewhere; allocating 901541Srgrimes * them here forces loader errors if this file is omitted 911541Srgrimes * (if they've been externed everywhere else; hah!). 921541Srgrimes */ 939759Sbdestruct buf *swbuf; 9467046Sjasone 9567046Sjasone/* 9687546Sdillon * Boot time overrides that are not scaled against main memory 9780418Speter */ 9880418Spetervoid 9987546Sdilloninit_param1(void) 10080418Speter{ 10180418Speter 10280418Speter hz = HZ; 10380418Speter TUNABLE_INT_FETCH("kern.hz", &hz); 10480418Speter tick = 1000000 / hz; 10580418Speter 10681986Sdillon#ifdef VM_SWZONE_SIZE_MAX 10781933Sdillon maxswzone = VM_SWZONE_SIZE_MAX; 10881986Sdillon#endif 109137393Sdes TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 11081986Sdillon#ifdef VM_BCACHE_SIZE_MAX 11181933Sdillon maxbcache = VM_BCACHE_SIZE_MAX; 11281986Sdillon#endif 113137393Sdes TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 11484783Sps 11584783Sps maxtsiz = MAXTSIZ; 116137393Sdes TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 11784783Sps dfldsiz = DFLDSIZ; 118137393Sdes TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 11984783Sps maxdsiz = MAXDSIZ; 120137393Sdes TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 12184783Sps dflssiz = DFLSSIZ; 122137393Sdes TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 12384783Sps maxssiz = MAXSSIZ; 124137393Sdes TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 12584783Sps sgrowsiz = SGROWSIZ; 126137393Sdes TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 12780418Speter} 12887546Sdillon 12987546Sdillon/* 13087546Sdillon * Boot time overrides that are scaled against main memory 13187546Sdillon */ 13287546Sdillonvoid 133102600Speterinit_param2(long physpages) 13487546Sdillon{ 13587546Sdillon 13687546Sdillon /* Base parameters */ 13790274Sdillon maxusers = MAXUSERS; 13890274Sdillon TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 13990274Sdillon if (maxusers == 0) { 14089769Sdillon maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); 14187546Sdillon if (maxusers < 32) 14287546Sdillon maxusers = 32; 14389769Sdillon if (maxusers > 384) 14489769Sdillon maxusers = 384; 14587546Sdillon } 14687546Sdillon 14787546Sdillon /* 14887546Sdillon * The following can be overridden after boot via sysctl. Note: 14987546Sdillon * unless overriden, these macros are ultimately based on maxusers. 15087546Sdillon */ 15187546Sdillon maxproc = NPROC; 15287546Sdillon TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 15391780Ssilby /* 15491780Ssilby * Limit maxproc so that kmap entries cannot be exhausted by 15591780Ssilby * processes. 15691780Ssilby */ 15791780Ssilby if (maxproc > (physpages / 12)) 15891780Ssilby maxproc = physpages / 12; 15987546Sdillon maxfiles = MAXFILES; 16087546Sdillon TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 16187817Ssilby maxprocperuid = (maxproc * 9) / 10; 16287817Ssilby maxfilesperproc = (maxfiles * 9) / 10; 163117391Ssilby 164117391Ssilby /* 165117391Ssilby * Cannot be changed after boot. 166117391Ssilby */ 167117391Ssilby nbuf = NBUF; 168117391Ssilby TUNABLE_INT_FETCH("kern.nbuf", &nbuf); 16987546Sdillon 170117391Ssilby ncallout = 16 + maxproc + maxfiles; 171117391Ssilby TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 172117391Ssilby} 173117391Ssilby 174117391Ssilby/* 175117391Ssilby * Boot time overrides that are scaled against the kernel map 176117391Ssilby */ 177117391Ssilbyvoid 178117391Ssilbyinit_param3(long kmempages) 179117391Ssilby{ 180127612Salc 18187546Sdillon /* 182127612Salc * The default for maxpipekva is max(5% of the kernel map, 512KB). 183127612Salc * See sys_pipe.c for more details. 184117325Ssilby */ 185118764Ssilby maxpipekva = (kmempages / 20) * PAGE_SIZE; 186117325Ssilby if (maxpipekva < 512 * 1024) 187117325Ssilby maxpipekva = 512 * 1024; 188118764Ssilby TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva); 18987546Sdillon} 190