/* $NetBSD: vmparam.h,v 1.12 1996/07/20 17:58:26 ragge Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Slightly modified for the VAX port /IC * * 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. * * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 */ #ifndef _LOCORE #include #endif /* * Machine dependent constants for VAX. */ /* * Virtual address space arrangement. On 386, both user and kernel * share the address space, not unlike the vax. * USRTEXT is the start of the user text/data space, while USRSTACK * is the top (end) of the user stack. Immediately above the user stack * resides the user structure, which is UPAGES long and contains the * kernel stack. * */ #define USRTEXT 0x400 #define USRSTACK 0x7fffe000 /* XXX */ /* * Virtual memory related constants, all in bytes */ #ifndef MAXTSIZ #define MAXTSIZ (6*1024*1024) /* max text size */ #endif #ifndef MAXDSIZ #define MAXDSIZ (16*1024*1024) /* max data size */ #endif #ifndef MAXSSIZ #define MAXSSIZ (16*1024*1024) /* max stack size */ #endif #ifndef DFLDSIZ #define DFLDSIZ (6*1024*1024) /* initial data size limit */ #endif #ifndef DFLSSIZ #define DFLSSIZ (512*1024) /* initial stack size limit */ #endif /* * Default sizes of swap allocation chunks (see dmap.h). * The actual values may be changed in vminit() based on MAXDSIZ. * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. */ #define DMMIN 32 /* smallest swap allocation */ #define DMMAX 4096 /* largest potential swap allocation */ #define DMTEXT 1024 /* swap allocation for text */ /* * Size of shared memory map */ #ifndef SHMMAXPGS #define SHMMAXPGS 64 /* XXXX should be 1024 */ #endif /* * Size of User Raw I/O map */ #define USRIOSIZE 300 /* * Sizes of the system and user portions of the system page table. * USRPTSIZE is maximum possible user virtual memory to be used. * KALLOCMEM is kernel malloc area size. How much needed for each process? * SYSPTSIZE is total size of statically allocated pte. (in physmem) * Ptsizes are in PTEs. */ #define USRPTSIZE ((MAXDSIZ >> PGSHIFT) * maxproc) #define KALLOCMEM (((1*1024*1024*maxproc)>>PGSHIFT)/4) #define SYSPTSIZE (((USRPTSIZE * 4) >> PGSHIFT) + UPAGES * maxproc + \ KALLOCMEM) /* * The time for a process to be blocked before being very swappable. * This is a number of seconds which the system takes as being a non-trivial * amount of real time. You probably shouldn't change this; * it is used in subtle ways (fractions and multiples of it are, that is, like * half of a ``long time'', almost a long time, etc.) * It is related to human patience and other factors which don't really * change over time. */ #define MAXSLP 20 /* * A swapped in process is given a small amount of core without being bothered * by the page replacement algorithm. Basically this says that if you are * swapped in you deserve some resources. We protect the last SAFERSS * pages against paging and will just swap you out rather than paging you. * Note that each process has at least UPAGES+CLSIZE pages which are not * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this * number just means a swapped in process is given around 25k bytes. * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), * so we loan each swapped in process memory worth 100$, or just admit * that we don't consider it worthwhile and swap it out to disk which costs * $30/mb or about $0.75. */ #define SAFERSS 8 /* nominal ``small'' resident set size protected against replacement */ /* * There are two clock hands, initially separated by HANDSPREAD bytes * (but at most all of user memory). The amount of time to reclaim * a page once the pageout process examines it increases with this * distance and decreases as the scan rate rises. */ #define HANDSPREAD (2 * 1024 * 1024) /* * The number of times per second to recompute the desired paging rate * and poke the pagedaemon. */ #define RATETOSCHEDPAGING 4 /* * Believed threshold (in megabytes) for which interleaved * swapping area is desirable. */ #define LOTSOFMEM 2 #define mapin(pte, v, pfnum, prot) \ {(*(int *)(pte) = ((pfnum)<p_addr)