117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/* @(#)vmparam.h 1.1 92/07/30 SMI */
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/*
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* Copyright (c) 1987 by Sun Microsystems, Inc.
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*/
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/*
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* Machine dependent constants for Sun-3
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*/
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#ifndef _sun3_vmparam_h
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#define _sun3_vmparam_h
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#include <machine/mmu.h>
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/*
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* USRTEXT is the start of the user text/data space, while USRSTACK
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* is the top (end) of the user stack. LOWPAGES and HIGHPAGES are
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* the number of pages from the beginning of the user address space
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* to the beginning of the text and from the end of the stack to the
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* end of the user address space respectively.
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*/
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#define USRTEXT 0x2000
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#define USRSTACK 0x0E000000
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#define LOWPAGES btoc(USRTEXT)
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#define HIGHPAGES 0
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/*
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* Virtual memory related constants for UNIX resource control, all in bytes
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*/
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#ifndef DFLDSIZ
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#define DFLDSIZ USRSTACK /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ USRSTACK /* max data size limit */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ CTXSIZE/2 /* max stack size limit */
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#endif
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#define SSIZE 1 /* initial stack size */
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#define SINCR 1 /* increment of stack */
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/*
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* Size of the kernel segkmem system pte table. This virtual
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* space is controlled by the resource map "kernelmap".
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*/
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#define SYSPTSIZE (0x700000 / MMU_PAGESIZE)
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/*
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* Minimum allowable virtual address space to be used
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* by the seg_map segment driver for fast kernel mappings.
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*/
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#define MINMAPSIZE 0x200000
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/*
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* The time for a process to be blocked before being very swappable.
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* This is a number of seconds which the system takes as being a non-trivial
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* amount of real time. You probably shouldn't change this;
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* it is used in subtle ways (fractions and multiples of it are, that is, like
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* half of a ``long time'', almost a long time, etc.)
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* It is related to human patience and other factors which don't really
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* change over time.
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*/
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#define MAXSLP 20
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/*
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* A swapped in process is given a small amount of core without being bothered
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* by the page replacement algorithm. Basically this says that if you are
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* swapped in you deserve some resources. We protect the last SAFERSS
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* pages against paging and will just swap you out rather than paging you.
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* Note that each process has at least UPAGES pages which are not
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* paged anyways so this number just means a swapped in process is
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* given around 32k bytes.
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*/
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#define SAFERSS 3 /* nominal ``small'' resident set size
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protected against replacement */
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/*
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* DISKRPM is used to estimate the number of paging i/o operations
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* which one can expect from a single disk controller.
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*/
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#define DISKRPM 60
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/*
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* Paging thresholds (see vm_pageout.c).
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* Strategy of 3/17/83:
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* lotsfree is 256k bytes, but at most 1/8 of memory
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* desfree is 100k bytes, but at most 1/16 of memory
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* minfree is 32k bytes, but at most 1/2 of desfree
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*/
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#define LOTSFREE (256 * 1024)
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#define LOTSFREEFRACT 8
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#define DESFREE (100 * 1024)
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#define DESFREEFRACT 16
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#define MINFREE (32 * 1024)
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#define MINFREEFRACT 2
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/*
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* There are two clock hands, initially separated by HANDSPREAD bytes
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* (but at most all of user memory). The amount of time to reclaim
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* a page once the pageout process examines it increases with this
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* distance and decreases as the scan rate rises.
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*/
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#define HANDSPREAD (2 * 1024 * 1024)
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/*
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* Paged text files that are less than PGTHRESH bytes
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* may be "prefaulted in" instead of demand paged.
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*/
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#define PGTHRESH (280 * 1024)
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#endif /*!_sun3_vmparam_h*/
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