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)0x0E000000) 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