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

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