143 lines
4.1 KiB
C
Executable File
143 lines
4.1 KiB
C
Executable File
/*
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* Copyright (c) 1991 by Sun Microsystems, Inc.
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*/
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ifndef _SYS_VM_MACHPARAM_H
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#define _SYS_VM_MACHPARAM_H
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#pragma ident "@(#)vm_machparam.h 1.22 95/01/16 SMI"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Machine dependent constants for Sun4d
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*/
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/*
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* USRTEXT is the start of the user text/data space.
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*/
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#define USRTEXT 0x2000
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/*
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* Number of pages to flush in one request to the disk when system is
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* dumping a crash image. It should be more than 1 since dump_kaddr()
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* uses atleast 2 pages.
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*/
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#define DUMPPAGES 16
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/*
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* Virtual memory related constants for UNIX resource control, all in bytes
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* The default stack size of 8M allows an optimization of mmu mapping
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* resources so that in normal use a single mmu region map entry (smeg)
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* can be used to map both the stack and shared libraries
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*/
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#define DFLSSIZ (8*1024*1024) /* initial stack size limit */
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/*
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* DSIZE_LIMIT and SSIZE_LIMIT exist to work-around an SVVS bug (1094085),
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* and should be removed from the kernel (1094089)
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*/
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#define DSIZE_LIMIT (0x7fffffff) /* physical data limit */
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#define SSIZE_LIMIT (0x7fffffff) /* physical stack limit */
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#define MAXDSIZ (0x7ffff000) /* max data size limit */
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#define MAXSSIZ (0x7ffff000) /* max stack size limit */
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#define DFLDSIZ MAXDSIZ /* initial data size limit */
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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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* The 11M is the hole that OBP may occupy. See startup.c.
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*/
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#define SYSPTSIZE (((79+1+146+11+14)*1024*1024) / 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 virtual address space to be used by the seg_map segment
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* driver for fast kernel mappings.
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*/
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#define SEGMAPSIZE (32 * 1024 * 1024)
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#define SEGMAPBASE (PPMAPBASE - SEGMAPSIZE)
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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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/*
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* nominal ``small'' resident set size
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* protected against replacement
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*/
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#define SAFERSS 3
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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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* XXX - The system doesn't account for multiple swap devices.
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*/
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#define DISKRPM 90
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/*
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* Default Paging thresholds (see vm_pageout.c).
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* Strategy of 11/30/93:
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* lotsfree is 1/16 of memory, but at most 1024k bytes.
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* desfree is 1/32 of memory, but at most 400k bytes.
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* minfree is 1/2 of desfree, but at most 200k bytes.
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*/
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#define LOTSFREE (1024 * 1024)
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#define LOTSFREEFRACT 16
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#define DESFREE (400 * 1024)
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#define DESFREEFRACT 32
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#define MINFREE (200 * 1024)
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#define MINFREEFRACT 2
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/*
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* The maximum value for handspreadpages which is the the distance
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* between the two clock hands in pages.
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*/
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#define MAXHANDSPREADPAGES ((64 * 1024 * 1024) / PAGESIZE)
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_VM_MACHPARAM_H */
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