The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_param.c

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    1 /*-
    2  * Copyright (c) 1980, 1986, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)param.c     8.3 (Berkeley) 8/20/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include "opt_param.h"
   41 #include "opt_maxusers.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 
   47 #include <vm/vm_param.h>
   48 
   49 /*
   50  * System parameter formulae.
   51  */
   52 
   53 #ifndef HZ
   54 #  if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__)
   55 #    define     HZ 1000
   56 #  else
   57 #    define     HZ 100
   58 #  endif
   59 #endif
   60 #define NPROC (20 + 16 * maxusers)
   61 #ifndef NBUF
   62 #define NBUF 0
   63 #endif
   64 #ifndef MAXFILES
   65 #define MAXFILES (maxproc * 2)
   66 #endif
   67 
   68 int     hz;
   69 int     tick;
   70 int     maxusers;                       /* base tunable */
   71 int     maxproc;                        /* maximum # of processes */
   72 int     maxprocperuid;                  /* max # of procs per user */
   73 int     maxfiles;                       /* sys. wide open files limit */
   74 int     maxfilesperproc;                /* per-proc open files limit */
   75 int     ncallout;                       /* maximum # of timer events */
   76 int     nbuf;
   77 int     nswbuf;
   78 int     maxswzone;                      /* max swmeta KVA storage */
   79 int     maxbcache;                      /* max buffer cache KVA storage */
   80 int     maxpipekva;                     /* Limit on pipe KVA */
   81 u_long  maxtsiz;                        /* max text size */
   82 u_long  dfldsiz;                        /* initial data size limit */
   83 u_long  maxdsiz;                        /* max data size */
   84 u_long  dflssiz;                        /* initial stack size limit */
   85 u_long  maxssiz;                        /* max stack size */
   86 u_long  sgrowsiz;                       /* amount to grow stack */
   87 
   88 /*
   89  * These have to be allocated somewhere; allocating
   90  * them here forces loader errors if this file is omitted
   91  * (if they've been externed everywhere else; hah!).
   92  */
   93 struct  buf *swbuf;
   94 
   95 /*
   96  * Boot time overrides that are not scaled against main memory
   97  */
   98 void
   99 init_param1(void)
  100 {
  101 
  102         hz = HZ;
  103         TUNABLE_INT_FETCH("kern.hz", &hz);
  104         tick = 1000000 / hz;
  105 
  106 #ifdef VM_SWZONE_SIZE_MAX
  107         maxswzone = VM_SWZONE_SIZE_MAX;
  108 #endif
  109         TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
  110 #ifdef VM_BCACHE_SIZE_MAX
  111         maxbcache = VM_BCACHE_SIZE_MAX;
  112 #endif
  113         TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache);
  114 
  115         maxtsiz = MAXTSIZ;
  116         TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
  117         dfldsiz = DFLDSIZ;
  118         TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
  119         maxdsiz = MAXDSIZ;
  120         TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
  121         dflssiz = DFLSSIZ;
  122         TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
  123         maxssiz = MAXSSIZ;
  124         TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
  125         sgrowsiz = SGROWSIZ;
  126         TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
  127 }
  128 
  129 /*
  130  * Boot time overrides that are scaled against main memory
  131  */
  132 void
  133 init_param2(long physpages)
  134 {
  135 
  136         /* Base parameters */
  137         maxusers = MAXUSERS;
  138         TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
  139         if (maxusers == 0) {
  140                 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
  141                 if (maxusers < 32)
  142                         maxusers = 32;
  143                 if (maxusers > 384)
  144                         maxusers = 384;
  145         }
  146 
  147         /*
  148          * The following can be overridden after boot via sysctl.  Note:
  149          * unless overriden, these macros are ultimately based on maxusers.
  150          */
  151         maxproc = NPROC;
  152         TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
  153         /*
  154          * Limit maxproc so that kmap entries cannot be exhausted by
  155          * processes.
  156          */
  157         if (maxproc > (physpages / 12))
  158                 maxproc = physpages / 12;
  159         maxfiles = MAXFILES;
  160         TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
  161         maxprocperuid = (maxproc * 9) / 10;
  162         maxfilesperproc = (maxfiles * 9) / 10;
  163         
  164         /*
  165          * Cannot be changed after boot.
  166          */
  167         nbuf = NBUF;
  168         TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
  169 
  170         ncallout = 16 + maxproc + maxfiles;
  171         TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
  172 }
  173 
  174 /*
  175  * Boot time overrides that are scaled against the kernel map
  176  */
  177 void
  178 init_param3(long kmempages)
  179 {
  180 
  181         /*
  182          * The default for maxpipekva is max(5% of the kernel map, 512KB).
  183          * See sys_pipe.c for more details.
  184          */
  185         maxpipekva = (kmempages / 20) * PAGE_SIZE;
  186         if (maxpipekva < 512 * 1024)
  187                 maxpipekva = 512 * 1024;
  188         TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva);
  189 }

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