Return to vmparam.h CVS log

Up to [Research Unix] / researchv9 / sys / sun3

Annotation of researchv9/sys/sun3/vmparam.h, revision 1.1.1.1

1.1       root        1: /*      @(#)vmparam.h 1.1 86/02/03 SMI      */
                      2: 
                      3: /*
                      4:  * Copyright (c) 1985 by Sun Microsystems, Inc.
                      5:  */
                      6: 
                      7: /*
                      8:  * Machine dependent constants for Sun-3
                      9:  */
                     10: 
                     11: /*
                     12:  * USRTEXT is the start of the user text/data space, while USRSTACK
                     13:  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
                     14:  * the number of pages from the beginning of the P0 region to the
                     15:  * beginning of the text and from the end of the stack to the end of the P1
                     16:  * region respectively.
                     17:  */
                     18: #define        USRTEXT         NBPG                    /* start of users text */
                     19: #define        OUSRTEXT        0x8000                  /*   ... for old Sun-2 a.outs */
                     20: #define        USRSTACK        0x0F000000              /* start of users stack */
                     21: #define        P1PAGES         btoc(USRSTACK)          /* no of pages in P1 region */
                     22: #define        LOWPAGES        btoc(USRTEXT)           /* no pages from P0 to text */
                     23: #define        HIGHPAGES       0                       /* no pages from P1 to stack */
                     24: 
                     25: /*
                     26:  * Virtual memory related constants
                     27:  */
                     28: #define        SLOP            32
                     29: #define        MAXTSIZ         btoc(32*1024*1024)      /* max text size (clicks) */
                     30: #define        MAXDSIZ         (btoc(USRSTACK)-SLOP)   /* max data size (clicks) */
                     31: #define        MAXSSIZ         (btoc(USRSTACK)-SLOP)   /* max stack size (clicks) */
                     32: 
                     33: /*
                     34:  * Sizes of the system and user portions of the system page table.
                     35:  * Note that they point into the kernel virtual address space, hence
                     36:  *   what they describe is the size of the table space, not the size of
                     37:  *   the space which can be mapped.
                     38:  */
                     39: #define        SYSPTSIZE       (0x100000/NBPG)
                     40: #define        USRPTSIZE       (0xa00000/NBPG)
                     41: /*
                     42:  * The size of the clock loop.
                     43:  */
                     44: #define        LOOPPAGES       (maxfree - firstfree)
                     45: 
                     46: /*
                     47:  * The time for a process to be blocked before being very swappable.
                     48:  * This is a number of seconds which the system takes as being a non-trivial
                     49:  * amount of real time.  You probably shouldn't change this;
                     50:  * it is used in subtle ways (fractions and multiples of it are, that is, like
                     51:  * half of a ``long time'', almost a long time, etc.)
                     52:  * It is related to human patience and other factors which don't really
                     53:  * change over time.
                     54:  */
                     55: #define        MAXSLP          20
                     56: 
                     57: /*
                     58:  * A swapped in process is given a small amount of core without being bothered
                     59:  * by the page replacement algorithm.  Basically this says that if you are
                     60:  * swapped in you deserve some resources.  We protect the last SAFERSS
                     61:  * pages against paging and will just swap you out rather than paging you.
                     62:  * Note that each process has at least UPAGES+CLSIZE pages which are not
                     63:  * paged anyways (this is currently 1+1=2 pages or 16k bytes), so this
                     64:  * number just means a swapped in process is given around 40k bytes.
                     65:  */
                     66: #define        SAFERSS         3               /* nominal ``small'' resident set size
                     67:                                           protected against replacement */
                     68: 
                     69: /*
                     70:  * DISKRPM is used to estimate the number of paging i/o operations
                     71:  * which one can expect from a single disk controller.
                     72:  */
                     73: #define        DISKRPM         60
                     74: 
                     75: /*
                     76:  * Klustering constants.  Klustering is the gathering
                     77:  * of pages together for pagein/pageout, while clustering
                     78:  * is the treatment of hardware page size as though it were
                     79:  * larger than it really is.
                     80:  *
                     81:  * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
                     82:  * units.  Note that KLMAX*CLSIZE must be a divisor of DMMIN in
                     83:  * autoconf.c and <= MAXPHYS/CLBYTES in vm_swp.c.
                     84:  */
                     85: 
                     86: #define        KLMAX   (2/CLSIZE)
                     87: #define        KLSEQL  (2/CLSIZE)              /* in klust if vadvise(VA_SEQL) */
                     88: #define        KLIN    (1/CLSIZE)              /* default data/stack in klust */
                     89: #define        KLTXT   (1/CLSIZE)              /* default text in klust */
                     90: #define        KLOUT   (2/CLSIZE)
                     91: 
                     92: /*
                     93:  * KLSDIST is the advance or retard of the fifo reclaim for sequential
                     94:  * processes data space.
                     95:  */
                     96: #define        KLSDIST 2               /* klusters advance/retard for seq. fifo */
                     97: 
                     98: /*
                     99:  * Paging thresholds (see vm_sched.c).
                    100:  * Strategy of 3/17/83:
                    101:  *     lotsfree is 1/8 of memory free.
                    102:  *     desfree is 100k bytes, but at most 1/16 of memory
                    103:  *     minfree is 32k bytes, but at most 1/2 of desfree
                    104:  */
                    105: #define        LOTSFREEFRACT   8
                    106: #define        DESFREE         (100 * 1024)
                    107: #define        DESFREEFRACT    16
                    108: #define        MINFREE         (32 * 1024)
                    109: #define        MINFREEFRACT    2
                    110: 
                    111: /*
                    112:  * Paged text files that are less than PGTHRESH bytes may be swapped
                    113:  * in instead of paged in.
                    114:  */
                    115: #define PGTHRESH       (200 * 1024)

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.