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Annotation of researchv10dc/lsys/sys/vmparam.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Machine dependent constants
                      3:  */
                      4: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
                      5:                                        /* number of ptes per page */
                      6: #define        USRSTACK        (0x80000000-UPAGES*NBPG)
                      7:                                        /* Start of user stack */
                      8: #define        P1TOP           0x200000        /* boundary between P0 and P1 regions */
                      9: #define        KSTART          0x80000000      /* beginning of system space */
                     10: 
                     11: /*
                     12:  * Virtual memory related (configured) constants
                     13:  */
                     14: #ifdef KERNEL
                     15: extern int maxtsize, maxdsize, maxssize;       /* max seg sizes, in clicks */
                     16: #endif
                     17: 
                     18: /*
                     19:  * space allocated to user page table
                     20:  */
                     21: #define        USRPTSIZE       (32*NPTEPG)
                     22: 
                     23: /*
                     24:  * The size of the clock loop.
                     25:  */
                     26: #define        LOOPPAGES       (maxfree - firstfree)
                     27: 
                     28: /*
                     29:  * The time for a process to be blocked before being very swappable.
                     30:  * This is a number of seconds which the system takes as being a non-trivial
                     31:  * amount of real time.  You probably shouldn't change this;
                     32:  * it is used in subtle ways (fractions and multiples of it are, that is, like
                     33:  * half of a ``long time'', almost a long time, etc.)
                     34:  * It is related to human patience and other factors which don't really
                     35:  * change over time.
                     36:  */
                     37: #define        MAXSLP          20
                     38: 
                     39: /*
                     40:  * A swapped in process is given a small amount of core without being bothered
                     41:  * by the page replacement algorithm.  Basically this says that if you are
                     42:  * swapped in you deserve some resources.  We protect the last SAFERSS
                     43:  * pages against paging and will just swap you out rather than paging you.
                     44:  * Note that each process has at least UPAGES+CLSIZE pages which are not
                     45:  * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
                     46:  * number just means a swapped in process is given around 25k bytes.
                     47:  * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
                     48:  * so we loan each swapped in process memory worth 100$, or just admit
                     49:  * that we don't consider it worthwhile and swap it out to disk which costs
                     50:  * $30/mb or about $0.75.
                     51:  */
                     52: #define        SAFERSS         32              /* nominal ``small'' resident set size
                     53:                                           protected against replacement */
                     54: 
                     55: /*
                     56:  * DISKRPM is used to estimate the number of paging i/o operations
                     57:  * which one can expect from a single disk controller.
                     58:  */
                     59: #define        DISKRPM         60
                     60: 
                     61: /*
                     62:  * minimum swap allocation piece
                     63:  * perhaps configurable later; for now, fixed
                     64:  */
                     65: #define        DMMIN   32
                     66: 
                     67: /*
                     68:  * Klustering constants.  Klustering is the gathering
                     69:  * of pages together for pagein/pageout, while clustering
                     70:  * is the treatment of hardware page size as though it were
                     71:  * larger than it really is.
                     72:  *
                     73:  * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
                     74:  * units.  KLMAX*CLSIZE must be <= DMMIN.
                     75:  */
                     76: 
                     77: #define        KLMAX   (32/CLSIZE)
                     78: #define        KLSEQL  (16/CLSIZE)             /* in klust if vadvise(VA_SEQL) */
                     79: #define        KLIN    (8/CLSIZE)              /* default data/stack in klust */
                     80: #define        KLTXT   (4/CLSIZE)              /* default text in klust */
                     81: #define        KLOUT   (32/CLSIZE)
                     82: 
                     83: /*
                     84:  * KLSDIST is the advance or retard of the fifo reclaim for sequential
                     85:  * processes data space.
                     86:  */
                     87: #define        KLSDIST 3               /* klusters advance/retard for seq. fifo */
                     88: 
                     89: #ifdef KERNEL
                     90: int    klseql;
                     91: int    klsdist;
                     92: int    klin;
                     93: int    kltxt;
                     94: int    klout;
                     95: #endif

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