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Annotation of 43BSDReno/sys/tahoe/vmparam.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)vmparam.h   7.2 (Berkeley) 5/10/90
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Machine dependent constants for tahoe.
        !            11:  */
        !            12: 
        !            13: /*
        !            14:  * USRTEXT is the start of the user text/data space, while USRSTACK
        !            15:  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
        !            16:  * the number of pages from the beginning of the P0 region to the
        !            17:  * beginning of the text and from the beginning of the P2 region to the
        !            18:  * beginning of the stack respectively.
        !            19:  */
        !            20: #define        USRTEXT         0
        !            21: #define        USRSTACK        (0xc0000000-UPAGES*NBPG) /* Start of user stack */
        !            22: #define        BTOPUSRSTACK    (0x300000 - UPAGES)      /* btop(USRSTACK) */
        !            23: #define        P2PAGES         0x100000        /* number of pages in P2 region */
        !            24: #define        LOWPAGES        0
        !            25: #define        HIGHPAGES       UPAGES
        !            26: 
        !            27: /*
        !            28:  * Virtual memory related constants, all in bytes
        !            29:  */
        !            30: #define        MAXTSIZ         (6*1024*1024)           /* max text size */
        !            31: #ifndef DFLDSIZ
        !            32: #define        DFLDSIZ         (6*1024*1024)           /* initial data size limit */
        !            33: #endif
        !            34: #ifndef MAXDSIZ
        !            35: #define        MAXDSIZ         (32*1024*1024)          /* max data size */
        !            36: #endif
        !            37: #ifndef        DFLSSIZ
        !            38: #define        DFLSSIZ         (512*1024)              /* initial stack size limit */
        !            39: #endif
        !            40: #ifndef        MAXSSIZ
        !            41: #define        MAXSSIZ         MAXDSIZ                 /* max stack size */
        !            42: #endif
        !            43: 
        !            44: /*
        !            45:  * Default sizes of swap allocation chunks (see dmap.h).
        !            46:  * The actual values may be changed in vminit() based on MAXDSIZ.
        !            47:  * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
        !            48:  * DMMIN should be at least ctod(1) so that vtod() works.
        !            49:  * vminit() ensures this.
        !            50:  */
        !            51: #define        DMMIN   32                      /* smallest swap allocation */
        !            52: #define        DMMAX   4096                    /* largest potential swap allocation */
        !            53: #define        DMTEXT  1024                    /* swap allocation for text */
        !            54: 
        !            55: /*
        !            56:  * Sizes of the system and user portions of the system page table.
        !            57:  */
        !            58: /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
        !            59: #define        SYSPTSIZE       ((20+MAXUSERS/2)*NPTEPG)
        !            60: #define        USRPTSIZE       (4*NPTEPG)
        !            61: 
        !            62: /*
        !            63:  * PTEs for system V compatible shared memory.
        !            64:  * This is basically slop for kmempt which we actually allocate (malloc) from.
        !            65:  */
        !            66: #define SHMMAXPGS      512
        !            67: 
        !            68: /*
        !            69:  * Boundary at which to place first MAPMEM segment if not explicitly
        !            70:  * specified.  Should be a power of two.  This allows some slop for
        !            71:  * the data segment to grow underneath the first mapped segment.
        !            72:  */
        !            73: #define MMSEG          0x200000
        !            74: 
        !            75: /*
        !            76:  * The size of the clock loop.
        !            77:  */
        !            78: #define        LOOPPAGES       (maxfree - firstfree)
        !            79: 
        !            80: /*
        !            81:  * The time for a process to be blocked before being very swappable.
        !            82:  * This is a number of seconds which the system takes as being a non-trivial
        !            83:  * amount of real time.  You probably shouldn't change this;
        !            84:  * it is used in subtle ways (fractions and multiples of it are, that is, like
        !            85:  * half of a ``long time'', almost a long time, etc.)
        !            86:  * It is related to human patience and other factors which don't really
        !            87:  * change over time.
        !            88:  */
        !            89: #define        MAXSLP          20
        !            90: 
        !            91: /*
        !            92:  * A swapped in process is given a small amount of core without being bothered
        !            93:  * by the page replacement algorithm.  Basically this says that if you are
        !            94:  * swapped in you deserve some resources.  We protect the last SAFERSS
        !            95:  * pages against paging and will just swap you out rather than paging you.
        !            96:  * Note that each process has at least UPAGES+CLSIZE pages which are not
        !            97:  * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
        !            98:  * number just means a swapped in process is given around 25k bytes.
        !            99:  * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
        !           100:  * so we loan each swapped in process memory worth 100$, or just admit
        !           101:  * that we don't consider it worthwhile and swap it out to disk which costs
        !           102:  * $30/mb or about $0.75.
        !           103:  */
        !           104: #define        SAFERSS         32              /* nominal ``small'' resident set size
        !           105:                                           protected against replacement */
        !           106: 
        !           107: /*
        !           108:  * DISKRPM is used to estimate the number of paging i/o operations
        !           109:  * which one can expect from a single disk controller.
        !           110:  */
        !           111: #define        DISKRPM         60
        !           112: 
        !           113: /*
        !           114:  * Klustering constants.  Klustering is the gathering
        !           115:  * of pages together for pagein/pageout, while clustering
        !           116:  * is the treatment of hardware page size as though it were
        !           117:  * larger than it really is.
        !           118:  *
        !           119:  * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
        !           120:  * units.  Note that ctod(KLMAX*CLSIZE) must be <= DMMIN in dmap.h.
        !           121:  * ctob(KLMAX) should also be less than MAXPHYS (in vm_swp.c) to
        !           122:  * avoid "big push" panics.
        !           123:  */
        !           124: 
        !           125: #define        KLMAX   (32/CLSIZE)
        !           126: #define        KLSEQL  (16/CLSIZE)             /* in klust if vadvise(VA_SEQL) */
        !           127: #define        KLIN    (8/CLSIZE)              /* default data/stack in klust */
        !           128: #define        KLTXT   (4/CLSIZE)              /* default text in klust */
        !           129: #define        KLOUT   (32/CLSIZE)
        !           130: 
        !           131: /*
        !           132:  * KLSDIST is the advance or retard of the fifo reclaim for sequential
        !           133:  * processes data space.
        !           134:  */
        !           135: #define        KLSDIST 3               /* klusters advance/retard for seq. fifo */
        !           136: 
        !           137: /*
        !           138:  * Paging thresholds (see vm_sched.c).
        !           139:  * Strategy of 1/19/85:
        !           140:  *     lotsfree is 512k bytes, but at most 1/4 of memory
        !           141:  *     desfree is 200k bytes, but at most 1/8 of memory
        !           142:  *     minfree is 64k bytes, but at most 1/2 of desfree
        !           143:  */
        !           144: #define        LOTSFREE        (512 * 1024)
        !           145: #define        LOTSFREEFRACT   4
        !           146: #define        DESFREE         (200 * 1024)
        !           147: #define        DESFREEFRACT    8
        !           148: #define        MINFREE         (64 * 1024)
        !           149: #define        MINFREEFRACT    2
        !           150: 
        !           151: /*
        !           152:  * There are two clock hands, initially separated by HANDSPREAD bytes
        !           153:  * (but at most all of user memory).  The amount of time to reclaim
        !           154:  * a page once the pageout process examines it increases with this
        !           155:  * distance and decreases as the scan rate rises.
        !           156:  */
        !           157: #define        HANDSPREAD      (2 * 1024 * 1024)
        !           158: 
        !           159: /*
        !           160:  * The number of times per second to recompute the desired paging rate
        !           161:  * and poke the pagedaemon.
        !           162:  */
        !           163: #define        RATETOSCHEDPAGING       4
        !           164: 
        !           165: /*
        !           166:  * Believed threshold (in megabytes) for which interleaved
        !           167:  * swapping area is desirable.
        !           168:  */
        !           169: #define        LOTSOFMEM       2
        !           170: 
        !           171: #define        mapin(pte, v, pfnum, prot) \
        !           172:        (*(int *)(pte) = (pfnum) | (prot), mtpr(TBIS, v))
        !           173: 
        !           174: /*
        !           175:  * Invalidate a cluster (optimized here for standard CLSIZE).
        !           176:  */
        !           177: #if CLSIZE == 1
        !           178: #define        tbiscl(v)       mtpr(TBIS, ptob(v))
        !           179: #endif

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