usr/src/lib/libbc/inc/include/sun4/vmparam.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1987-1998,2001 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _SUN4_VMPARAM_H
  28 #define _SUN4_VMPARAM_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 #include <sun4/param.h>
  37
  38 /*
  39  * Machine dependent constants for Sun-4
  40  */
  41
  42 /*
  43  * USRTEXT is the start of the user text/data space, while USRSTACK
  44  * is the top (end) of the user stack.
  45  */
  46 #define USRTEXT         0x2000
  47 #define USRSTACK        KERNELBASE
  48
  49 /*
  50  * Virtual memory related constants for UNIX resource control, all in bytes
  51  * The default stack size of 8M allows an optimization of mmu mapping
  52  * resources so that in normal use a single mmu region map entry (smeg)
  53  * can be used to map both the stack and shared libraries
  54  */
  55 #define DFLSSIZ         (8*1024*1024)           /* initial stack size limit */
  56
  57 #define DFLDSIZ_260     ((512*1024*1024)-USRTEXT) /* initial data size limit */
  58 #define MAXDSIZ_260     ((512*1024*1024)-USRTEXT) /* max data size limit */
  59 #define MAXSSIZ_260     ((512*1024*1024)-KERNELSIZE) /* max stack size limit */
  60
  61 #define DFLDSIZ_470     ((2048*1024*1024)-USRTEXT) /* initial data size limit */
  62 #define MAXDSIZ_470     ((2048*1024*1024)-USRTEXT) /* max data size limit */
  63 #define MAXSSIZ_470     ((2048*1024*1024)-KERNELSIZE) /* max stack size limit */
  64
  65 #define DFLDSIZ         dfldsiz
  66 #define MAXDSIZ         maxdsiz
  67 #define MAXSSIZ         maxssiz
  68
  69 #ifndef LOCORE
  70 extern unsigned int     dfldsiz;
  71 extern unsigned int     maxdsiz;
  72 extern unsigned int     maxssiz;
  73 #endif /* !LOCORE */
  74
  75 #define SSIZE           1                       /* initial stack size */
  76 #define SINCR           1                       /* increment of stack */
  77
  78 /*
  79  * Size of the kernel segkmem system pte table.  This virtual
  80  * space is controlled by the resource map "kernelmap".
  81  */
  82 #define SYSPTSIZE       (0x640000 / MMU_PAGESIZE)
  83
  84 /*
  85  * Minimum allowable virtual address space to be used
  86  * by the seg_map segment driver for fast kernel mappings.
  87  */
  88 #define MINMAPSIZE      0x200000
  89
  90 /*
  91  * The time for a process to be blocked before being very swappable.
  92  * This is a number of seconds which the system takes as being a non-trivial
  93  * amount of real time. You probably shouldn't change this;
  94  * it is used in subtle ways (fractions and multiples of it are, that is, like
  95  * half of a ``long time'', almost a long time, etc.)
  96  * It is related to human patience and other factors which don't really
  97  * change over time.
  98  */
  99 #define MAXSLP          20
 100
 101 /*
 102  * A swapped in process is given a small amount of core without being bothered
 103  * by the page replacement algorithm. Basically this says that if you are
 104  * swapped in you deserve some resources. We protect the last SAFERSS
 105  * pages against paging and will just swap you out rather than paging you.
 106  * Note that each process has at least UPAGES pages which are not
 107  * paged anyways so this number just means a swapped in process is
 108  * given around 32k bytes.
 109  */
 110 #define SAFERSS         3
 111
 112 /*
 113  * DISKRPM is used to estimate the number of paging i/o operations
 114  * which one can expect from a single disk controller.
 115  */
 116 #define DISKRPM         60
 117
 118 /*
 119  * Paging thresholds (see vm_pageout.c).
 120  * Strategy of 3/17/83:
 121  *      lotsfree is 256k bytes, but at most 1/8 of memory
 122  *      desfree is 100k bytes, but at most 1/16 of memory
 123  *      minfree is 32k bytes, but at most 1/2 of desfree
 124  */
 125 #define LOTSFREE        (256 * 1024)
 126 #define LOTSFREEFRACT   8
 127 #define DESFREE         (100 * 1024)
 128 #define DESFREEFRACT    16
 129 #define MINFREE         (32 * 1024)
 130 #define MINFREEFRACT    2
 131
 132 /*
 133  * There are two clock hands, initially separated by HANDSPREAD bytes
 134  * (but at most all of user memory).  The amount of time to reclaim
 135  * a page once the pageout process examines it increases with this
 136  * distance and decreases as the scan rate rises.
 137  */
 138 #define HANDSPREAD      (2 * 1024 * 1024)
 139
 140 /*
 141  * Paged text files that are less than PGTHRESH bytes
 142  * may be "prefaulted in" instead of demand paged.
 143  */
 144 #define PGTHRESH        (280 * 1024)
 145
 146 #ifdef __cplusplus
 147 }
 148 #endif
 149
 150 #endif /* !_SUN4_VMPARAM_H */