1 /* $NetBSD: vmparam.h,v 1.20 1998/02/05 04:57:01 gwr Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #ifdef _SUN3_ 37 #include <machine/vmparam3.h> 38 #endif /* SUN3 */ 39 #ifdef _SUN3X_ 40 #include <machine/vmparam3x.h> 41 #endif /* SUN3X */ 42 43 /* 44 * The time for a process to be blocked before being very swappable. 45 * This is a number of seconds which the system takes as being a non-trivial 46 * amount of real time. You probably shouldn't change this; 47 * it is used in subtle ways (fractions and multiples of it are, that is, like 48 * half of a ``long time'', almost a long time, etc.) 49 * It is related to human patience and other factors which don't really 50 * change over time. 51 */ 52 #define MAXSLP 20 53 54 /* 55 * A swapped in process is given a small amount of core without being bothered 56 * by the page replacement algorithm. Basically this says that if you are 57 * swapped in you deserve some resources. We protect the last SAFERSS 58 * pages against paging and will just swap you out rather than paging you. 59 * Note that each process has at least UPAGES+CLSIZE pages which are not 60 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 61 * number just means a swapped in process is given around 25k bytes. 62 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 63 * so we loan each swapped in process memory worth 100$, or just admit 64 * that we don't consider it worthwhile and swap it out to disk which costs 65 * $30/mb or about $0.75. 66 * Update: memory prices have changed recently (9/96). At the current 67 * value of $6 per megabyte, we lend each swapped in process memory worth 68 * $0.15, or just admit that we don't consider it worthwhile and swap it out 69 * to disk which costs $0.20/MB, or just under half a cent. 70 */ 71 #define SAFERSS 4 /* nominal ``small'' resident set size 72 protected against replacement */ 73