date and time created 82/11/09 11:28:29 by sam

SCCS-vsn: sys/vax/include/vmparam.h 4.1

diff --git a/usr/src/sys/vax/include/vmparam.h b/usr/src/sys/vax/include/vmparam.h
new file mode 100644 (file)
index 0000000..bb6ffeb
--- /dev/null
+++ b/usr/src/sys/vax/include/vmparam.h
@@ -0,0 +1,96 @@
+/*     vmparam.h       4.1     82/11/09        */
+
+/*
+ * Machine dependent constants for VAX
+ */
+/*
+ * USRTEXT is the start of the user text/data space, while USRSTACK
+ * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
+ * the number of pages from the beginning of the P0 region to the
+ * beginning of the text and from the beginning of the P1 region to the
+ * beginning of the stack respectively.
+ */
+                                       /* number of ptes per page */
+#define        USRTEXT         0
+#define        USRSTACK        (0x80000000-UPAGES*NBPG)
+                                       /* Start of user stack */
+#define        P1PAGES         0x200000        /* number of pages in P1 region */
+#define        LOWPAGES        0
+#define        HIGHPAGES       UPAGES
+
+/*
+ * Virtual memory related constants
+ */
+#define        SLOP    32
+#define        MAXTSIZ         (6*2048-SLOP)           /* max text size (clicks) */
+#ifndef MAXDSIZ
+#define        MAXDSIZ         (12*1024-32-SLOP)       /* max data size (clicks) */
+#endif
+#define        MAXSSIZ         (12*1024-32-SLOP)       /* max stack size (clicks) */
+
+/*
+ * Sizes of the system and user portions of the system page table.
+ */
+/* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
+#define        SYSPTSIZE       (12*NPTEPG)
+#define        USRPTSIZE       (8*NPTEPG)
+
+/*
+ * The size of the clock loop.
+ */
+#define        LOOPPAGES       (maxfree - firstfree)
+
+/*
+ * The time for a process to be blocked before being very swappable.
+ * This is a number of seconds which the system takes as being a non-trivial
+ * amount of real time.  You probably shouldn't change this;
+ * it is used in subtle ways (fractions and multiples of it are, that is, like
+ * half of a ``long time'', almost a long time, etc.)
+ * It is related to human patience and other factors which don't really
+ * change over time.
+ */
+#define        MAXSLP          20
+
+/*
+ * A swapped in process is given a small amount of core without being bothered
+ * by the page replacement algorithm.  Basically this says that if you are
+ * swapped in you deserve some resources.  We protect the last SAFERSS
+ * pages against paging and will just swap you out rather than paging you.
+ * Note that each process has at least UPAGES+CLSIZE pages which are not
+ * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
+ * number just means a swapped in process is given around 25k bytes.
+ * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
+ * so we loan each swapped in process memory worth 100$, or just admit
+ * that we don't consider it worthwhile and swap it out to disk which costs
+ * $30/mb or about $0.75.
+ */
+#define        SAFERSS         32              /* nominal ``small'' resident set size
+                                          protected against replacement */
+
+/*
+ * DISKRPM is used to estimate the number of paging i/o operations
+ * which one can expect from a single disk controller.
+ */
+#define        DISKRPM         60
+
+/*
+ * Klustering constants.  Klustering is the gathering
+ * of pages together for pagein/pageout, while clustering
+ * is the treatment of hardware page size as though it were
+ * larger than it really is.
+ *
+ * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
+ * units.  Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
+ */
+
+#define        KLMAX   (32/CLSIZE)
+#define        KLSEQL  (16/CLSIZE)             /* in klust if vadvise(VA_SEQL) */
+#define        KLIN    (8/CLSIZE)              /* default data/stack in klust */
+#define        KLTXT   (4/CLSIZE)              /* default text in klust */
+#define        KLOUT   (32/CLSIZE)
+
+/*
+ * KLSDIST is the advance or retard of the fifo reclaim for sequential
+ * processes data space.
+ */
+#define        KLSDIST 3               /* klusters advance/retard for seq. fifo */