diff options
Diffstat (limited to 'sys/kern/subr_param.c')
| -rw-r--r-- | sys/kern/subr_param.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c new file mode 100644 index 0000000..820fe0107 --- /dev/null +++ b/sys/kern/subr_param.c @@ -0,0 +1,169 @@ +/* + * 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 + * $FreeBSD$ + */ + +#include "opt_param.h" +#include "opt_maxusers.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> + +#include <machine/vmparam.h> + +/* + * 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 + +int hz; +int tick; +int maxusers; /* base tunable */ +int maxproc; /* maximum # of processes */ +int maxprocperuid; /* max # of procs per user */ +int maxfiles; /* sys. wide open files limit */ +int maxfilesperproc; /* per-proc open files limit */ +int ncallout; /* maximum # of timer events */ +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 */ + +/* + * 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); + tick = 1000000 / hz; + +#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; + + /* + * Cannot be changed after boot. + */ + nbuf = NBUF; + TUNABLE_INT_FETCH("kern.nbuf", &nbuf); + + ncallout = 16 + maxproc + maxfiles; + TUNABLE_INT_FETCH("kern.ncallout", &ncallout); +} |
