X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=includes%2Frts%2FConstants.h;h=54a1ca71ca3c6c8fd7b79b968871e67bce5a7d98;hb=4bba92f93b88e15f0e0f23732d2cfa540acb737b;hp=b283befde2cfbddcaedbce299899a27c5b999a84;hpb=c5cafbcca54c4b1117bc43b31d86afa583fb7f62;p=ghc-hetmet.git

diff --git a/includes/rts/Constants.h b/includes/rts/Constants.h
index b283bef..54a1ca7 100644
--- a/includes/rts/Constants.h
+++ b/includes/rts/Constants.h
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------------
  *
- * (c) The GHC Team, 1998-2002
+ * (c) The GHC Team, 1998-2009
  *
  * Constants
  *
@@ -12,6 +12,9 @@
  * the system (eg. structure sizes) are generated into the file
  * DerivedConstants.h by a C program (mkDerivedConstantsHdr).
  *
+ * To understand the structure of the RTS headers, see the wiki:
+ *   http://hackage.haskell.org/trac/ghc/wiki/Commentary/SourceTree/Includes
+ *
  * -------------------------------------------------------------------------- */
 
 #ifndef RTS_CONSTANTS_H
@@ -63,6 +66,13 @@
 #define MAX_CHARLIKE		255
 #define MIN_CHARLIKE		0
 
+/* Each byte in the card table for an StgMutaArrPtrs covers
+ * (1<<MUT_ARR_PTRS_CARD_BITS) elements in the array.  To find a good
+ * value for this, I used the benchmarks nofib/gc/hash,
+ * nofib/gc/graph, and nofib/gc/gc_bench.
+ */
+#define MUT_ARR_PTRS_CARD_BITS 7
+
 /* -----------------------------------------------------------------------------
    STG Registers.
 
@@ -254,8 +264,19 @@
  */
 #define TSO_LINK_DIRTY 32
 
+/*
+ * Used by the sanity checker to check whether TSOs are on the correct
+ * mutable list.
+ */
 #define TSO_MARKED 64
 
+/*
+ * Used to communicate between stackSqueeze() and
+ * threadStackOverflow() that a thread's stack was squeezed and the
+ * stack may not need to be expanded.
+ */
+#define TSO_SQUEEZED 128
+
 /* -----------------------------------------------------------------------------
    RET_DYN stack frames
    -------------------------------------------------------------------------- */
@@ -275,4 +296,13 @@
 #error RESERVED_STACK_WORDS may be wrong!
 #endif
 
+/*
+ * The number of times we spin in a spin lock before yielding (see
+ * #3758).  To tune this value, use the benchmark in #3758: run the
+ * server with -N2 and the client both on a dual-core.  Also make sure
+ * that the chosen value doesn't slow down any of the parallel
+ * benchmarks in nofib/parallel.
+ */
+#define SPIN_COUNT 1000
+
 #endif /* RTS_CONSTANTS_H */