vmparam3.h revision 1.1 
1
2#define USRTEXT         NBPG
3#define USRSTACK        (0-NBPG)
4
5/*
6 * Virtual memory related constants, all in bytes
7 */
8#ifndef MAXTSIZ
9#define	MAXTSIZ		(6*1024*1024)		/* max text size */
10#endif
11#ifndef DFLDSIZ
12#define	DFLDSIZ		(8*1024*1024)		/* initial data size limit */
13#endif
14#ifndef MAXDSIZ
15#define	MAXDSIZ		(16*1024*1024)		/* max data size */
16#endif
17#ifndef	DFLSSIZ
18#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
19#endif
20#ifndef	MAXSSIZ
21#define	MAXSSIZ		MAXDSIZ			/* max stack size */
22#endif
23
24/*
25 * Default sizes of swap allocation chunks (see dmap.h).
26 * The actual values may be changed in vminit() based on MAXDSIZ.
27 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
28 * DMMIN should be at least ctod(1) so that vtod() works.
29 * vminit() insures this.
30 */
31#define	DMMIN	32			/* smallest swap allocation */
32#define	DMMAX	4096			/* largest potential swap allocation */
33
34/*
35 * The time for a process to be blocked before being very swappable.
36 * This is a number of seconds which the system takes as being a non-trivial
37 * amount of real time.  You probably shouldn't change this;
38 * it is used in subtle ways (fractions and multiples of it are, that is, like
39 * half of a ``long time'', almost a long time, etc.)
40 * It is related to human patience and other factors which don't really
41 * change over time.
42 */
43#define	MAXSLP 		20
44
45/*
46 * A swapped in process is given a small amount of core without being bothered
47 * by the page replacement algorithm.  Basically this says that if you are
48 * swapped in you deserve some resources.  We protect the last SAFERSS
49 * pages against paging and will just swap you out rather than paging you.
50 * Note that each process has at least UPAGES+CLSIZE pages which are not
51 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
52 * number just means a swapped in process is given around 25k bytes.
53 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
54 * so we loan each swapped in process memory worth 100$, or just admit
55 * that we don't consider it worthwhile and swap it out to disk which costs
56 * $30/mb or about $0.75.
57 */
58#define	SAFERSS		4		/* nominal ``small'' resident set size
59					   protected against replacement */
60
61
62/*
63 * Mach derived constants
64 */
65
66/* user/kernel map constants */
67#define VM_MIN_ADDRESS		((vm_offset_t)0)
68#define VM_MAXUSER_ADDRESS	((vm_offset_t)0xFFF00000)
69#define VM_MAX_ADDRESS		((vm_offset_t)0xFFF00000)
70#define VM_MIN_KERNEL_ADDRESS	((vm_offset_t)0x0E004000)
71#define VM_MAX_KERNEL_ADDRESS	((vm_offset_t)0xFFFFF000)
72
73/* virtual sizes (bytes) for various kernel submaps */
74#define VM_MBUF_SIZE		(NMBCLUSTERS*MCLBYTES)
75#define VM_KMEM_SIZE		(NKMEMCLUSTERS*CLBYTES)
76#define VM_PHYS_SIZE		(USRIOSIZE*CLBYTES)
77