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1 | /* |
2 | * Copyright (c) 1988 University of Utah. | |
3 | * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * the Systems Programming Group of the University of Utah Computer | |
8 | * Science Department. | |
9 | * | |
10 | * %sccs.include.redist.c% | |
11 | * | |
12 | * from: Utah $Hdr: vmparam.h 1.14 89/08/14$ | |
13 | * | |
14 | * @(#)vmparam.h 7.1 (Berkeley) %G% | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Machine dependent constants for HP300 | |
19 | */ | |
20 | /* | |
21 | * USRTEXT is the start of the user text/data space, while USRSTACK | |
22 | * is the top (end) of the user stack. LOWPAGES and HIGHPAGES are | |
23 | * the number of pages from the beginning of the P0 region to the | |
24 | * beginning of the text and from the beginning of the P1 region to the | |
25 | * beginning of the stack respectively. | |
26 | * | |
27 | * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3) | |
28 | * is for HPUX compatibility. Why?? Because HPUX's debuggers | |
29 | * have the user's stack hard-wired at FFF00000 for post-mortems, | |
30 | * and we must be compatible... | |
31 | */ | |
32 | #define USRTEXT 0 | |
33 | #define USRSTACK (-HIGHPAGES*NBPG) /* Start of user stack */ | |
34 | #define BTOPUSRSTACK (0x100000-HIGHPAGES) /* btop(USRSTACK) */ | |
35 | #define P1PAGES 0x100000 | |
36 | #define LOWPAGES 0 | |
37 | #define HIGHPAGES (0x100000/NBPG) | |
38 | ||
39 | /* | |
40 | * Virtual memory related constants, all in bytes | |
41 | */ | |
42 | #ifndef MAXTSIZ | |
43 | #define MAXTSIZ (6*1024*1024) /* max text size */ | |
44 | #endif | |
45 | #ifndef DFLDSIZ | |
46 | #define DFLDSIZ (8*1024*1024) /* initial data size limit */ | |
47 | #endif | |
48 | #ifndef MAXDSIZ | |
49 | #define MAXDSIZ (16*1024*1024) /* max data size */ | |
50 | #endif | |
51 | #ifndef DFLSSIZ | |
52 | #define DFLSSIZ (512*1024) /* initial stack size limit */ | |
53 | #endif | |
54 | #ifndef MAXSSIZ | |
55 | #define MAXSSIZ MAXDSIZ /* max stack size */ | |
56 | #endif | |
57 | ||
58 | /* | |
59 | * Default sizes of swap allocation chunks (see dmap.h). | |
60 | * The actual values may be changed in vminit() based on MAXDSIZ. | |
61 | * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. | |
62 | * DMMIN should be at least ctod(1) so that vtod() works. | |
63 | * vminit() insures this. | |
64 | */ | |
65 | #define DMMIN 32 /* smallest swap allocation */ | |
66 | #define DMMAX 4096 /* largest potential swap allocation */ | |
67 | #define DMTEXT 1024 /* swap allocation for text */ | |
68 | ||
69 | /* | |
70 | * Sizes of the system and user portions of the system page table. | |
71 | */ | |
72 | /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */ | |
73 | #define SYSPTSIZE (2 * NPTEPG) | |
74 | #define USRPTSIZE (1 * NPTEPG) | |
75 | ||
76 | /* | |
77 | * PTEs for mapping user space into kernel for phyio operations. | |
78 | * One page is enough to handle 4Mb of simultaneous raw IO operations. | |
79 | */ | |
80 | #define USRIOSIZE (1 * NPTEPG) | |
81 | ||
82 | /* | |
83 | * PTEs for system V style shared memory. | |
84 | * This is basically slop for kmempt which we actually allocate (malloc) from. | |
85 | */ | |
86 | #define SHMMAXPGS 1024 | |
87 | ||
88 | /* | |
89 | * Boundary at which to place first MAPMEM segment if not explicitly | |
90 | * specified. Should be a power of two. This allows some slop for | |
91 | * the data segment to grow underneath the first mapped segment. | |
92 | */ | |
93 | #define MMSEG 0x200000 | |
94 | ||
95 | /* | |
96 | * The size of the clock loop. | |
97 | */ | |
98 | #define LOOPPAGES (maxfree - firstfree) | |
99 | ||
100 | /* | |
101 | * The time for a process to be blocked before being very swappable. | |
102 | * This is a number of seconds which the system takes as being a non-trivial | |
103 | * amount of real time. You probably shouldn't change this; | |
104 | * it is used in subtle ways (fractions and multiples of it are, that is, like | |
105 | * half of a ``long time'', almost a long time, etc.) | |
106 | * It is related to human patience and other factors which don't really | |
107 | * change over time. | |
108 | */ | |
109 | #define MAXSLP 20 | |
110 | ||
111 | /* | |
112 | * A swapped in process is given a small amount of core without being bothered | |
113 | * by the page replacement algorithm. Basically this says that if you are | |
114 | * swapped in you deserve some resources. We protect the last SAFERSS | |
115 | * pages against paging and will just swap you out rather than paging you. | |
116 | * Note that each process has at least UPAGES+CLSIZE pages which are not | |
117 | * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this | |
118 | * number just means a swapped in process is given around 25k bytes. | |
119 | * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), | |
120 | * so we loan each swapped in process memory worth 100$, or just admit | |
121 | * that we don't consider it worthwhile and swap it out to disk which costs | |
122 | * $30/mb or about $0.75. | |
123 | */ | |
124 | #define SAFERSS 4 /* nominal ``small'' resident set size | |
125 | protected against replacement */ | |
126 | ||
127 | /* | |
128 | * DISKRPM is used to estimate the number of paging i/o operations | |
129 | * which one can expect from a single disk controller. | |
130 | */ | |
131 | #define DISKRPM 60 | |
132 | ||
133 | /* | |
134 | * Klustering constants. Klustering is the gathering | |
135 | * of pages together for pagein/pageout, while clustering | |
136 | * is the treatment of hardware page size as though it were | |
137 | * larger than it really is. | |
138 | * | |
139 | * KLMAX gives maximum cluster size in CLSIZE page (cluster-page) | |
140 | * units. Note that ctod(KLMAX*CLSIZE) must be <= DMMIN in dmap.h. | |
141 | * ctob(KLMAX) should also be less than MAXPHYS (in vm_swp.c) | |
142 | * unless you like "big push" panics. | |
143 | */ | |
144 | ||
145 | #define KLMAX (4/CLSIZE) | |
146 | #define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */ | |
147 | #define KLIN (4/CLSIZE) /* default data/stack in klust */ | |
148 | #define KLTXT (4/CLSIZE) /* default text in klust */ | |
149 | #define KLOUT (4/CLSIZE) | |
150 | ||
151 | /* | |
152 | * KLSDIST is the advance or retard of the fifo reclaim for sequential | |
153 | * processes data space. | |
154 | */ | |
155 | #define KLSDIST 3 /* klusters advance/retard for seq. fifo */ | |
156 | ||
157 | /* | |
158 | * Paging thresholds (see vm_sched.c). | |
159 | * Strategy of 1/19/85: | |
160 | * lotsfree is 512k bytes, but at most 1/4 of memory | |
161 | * desfree is 200k bytes, but at most 1/8 of memory | |
162 | * minfree is 64k bytes, but at most 1/2 of desfree | |
163 | */ | |
164 | #define LOTSFREE (512 * 1024) | |
165 | #define LOTSFREEFRACT 4 | |
166 | #define DESFREE (200 * 1024) | |
167 | #define DESFREEFRACT 8 | |
168 | #define MINFREE (64 * 1024) | |
169 | #define MINFREEFRACT 2 | |
170 | ||
171 | /* | |
172 | * There are two clock hands, initially separated by HANDSPREAD bytes | |
173 | * (but at most all of user memory). The amount of time to reclaim | |
174 | * a page once the pageout process examines it increases with this | |
175 | * distance and decreases as the scan rate rises. | |
176 | */ | |
177 | #define HANDSPREAD (2 * 1024 * 1024) | |
178 | ||
179 | /* | |
180 | * The number of times per second to recompute the desired paging rate | |
181 | * and poke the pagedaemon. | |
182 | */ | |
183 | #define RATETOSCHEDPAGING 4 | |
184 | ||
185 | /* | |
186 | * Believed threshold (in megabytes) for which interleaved | |
187 | * swapping area is desirable. | |
188 | */ | |
189 | #define LOTSOFMEM 2 | |
190 | ||
191 | #define mapin(pte, v, pfnum, prot) \ | |
192 | (*(u_int *)(pte) = ((pfnum) << PGSHIFT) | (prot), TBIS((caddr_t)(v))) |