/* * Copyright (c) 1980, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)param.c 8.3 (Berkeley) 8/20/94 * $FreeBSD: src/sys/kern/subr_param.c,v 1.42.2.10 2002/03/09 21:05:47 silby Exp $ * $DragonFly: src/sys/kern/subr_param.c,v 1.5 2004/05/03 16:06:26 joerg Exp $ */ #include "opt_param.h" #include "opt_maxusers.h" #include #include #include #include /* * System parameter formulae. */ #ifndef HZ #define HZ 100 #endif #define NPROC (20 + 16 * maxusers) #ifndef NBUF #define NBUF 0 #endif #ifndef MAXFILES #define MAXFILES (maxproc * 2) #endif #ifndef NSFBUFS #define NSFBUFS (512 + maxusers * 16) #endif #ifndef MAXPOSIXLOCKSPERUID #define MAXPOSIXLOCKSPERUID (maxusers * 64) /* Should be a safe value */ #endif int hz; int stathz; int profhz; int tick; int tickadj; /* can adjust 30ms in 60s */ int maxusers; /* base tunable */ int maxproc; /* maximum # of processes */ int maxprocperuid; /* max # of procs per user */ int maxfiles; /* system wide open files limit */ int maxfilesrootres; /* descriptors reserved for root use */ int maxfilesperproc; /* per-proc open files limit */ int maxposixlocksperuid; /* max # POSIX locks per uid */ int ncallout; /* maximum # of timer events */ int mbuf_wait = 32; /* mbuf sleep time in ticks */ int nbuf; int nswbuf; int maxswzone; /* max swmeta KVA storage */ int maxbcache; /* max buffer cache KVA storage */ u_quad_t maxtsiz; /* max text size */ u_quad_t dfldsiz; /* initial data size limit */ u_quad_t maxdsiz; /* max data size */ u_quad_t dflssiz; /* initial stack size limit */ u_quad_t maxssiz; /* max stack size */ u_quad_t sgrowsiz; /* amount to grow stack */ /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ int nsfbufs; /* * These have to be allocated somewhere; allocating * them here forces loader errors if this file is omitted * (if they've been externed everywhere else; hah!). */ struct buf *swbuf; /* * Boot time overrides that are not scaled against main memory */ void init_param1(void) { hz = HZ; TUNABLE_INT_FETCH("kern.hz", &hz); stathz = hz * 128 / 100; profhz = stathz; tick = 1000000 / hz; tickadj = howmany(30000, 60 * hz); /* can adjust 30ms in 60s */ #ifdef VM_SWZONE_SIZE_MAX maxswzone = VM_SWZONE_SIZE_MAX; #endif TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone); #ifdef VM_BCACHE_SIZE_MAX maxbcache = VM_BCACHE_SIZE_MAX; #endif TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache); maxtsiz = MAXTSIZ; TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); dfldsiz = DFLDSIZ; TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); maxdsiz = MAXDSIZ; TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); dflssiz = DFLSSIZ; TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); maxssiz = MAXSSIZ; TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); sgrowsiz = SGROWSIZ; TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); } /* * Boot time overrides that are scaled against main memory */ void init_param2(int physpages) { /* Base parameters */ maxusers = MAXUSERS; TUNABLE_INT_FETCH("kern.maxusers", &maxusers); if (maxusers == 0) { maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); if (maxusers < 32) maxusers = 32; if (maxusers > 384) maxusers = 384; } /* * The following can be overridden after boot via sysctl. Note: * unless overriden, these macros are ultimately based on maxusers. */ maxproc = NPROC; TUNABLE_INT_FETCH("kern.maxproc", &maxproc); /* * Limit maxproc so that kmap entries cannot be exhausted by * processes. */ if (maxproc > (physpages / 12)) maxproc = physpages / 12; maxfiles = MAXFILES; TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); maxprocperuid = (maxproc * 9) / 10; maxfilesperproc = (maxfiles * 9) / 10; maxfilesrootres = maxfiles / 20; maxposixlocksperuid = MAXPOSIXLOCKSPERUID; TUNABLE_INT_FETCH("kern.maxposixlocksperuid", &maxposixlocksperuid); /* * Cannot be changed after boot. Unless overriden, NSFBUFS is based * on maxusers and NBUF is typically 0 (auto-sized later). */ nsfbufs = NSFBUFS; TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs); nbuf = NBUF; TUNABLE_INT_FETCH("kern.nbuf", &nbuf); ncallout = 16 + maxproc + maxfiles; TUNABLE_INT_FETCH("kern.ncallout", &ncallout); }