X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86-64%2Fbackend-parms.lisp;h=33ffb6ec64a97387dc4aa06af45bc6885356a811;hb=7254da92a1ba1bf8bc5a2e78a29d993f272d526e;hp=1d5f41830ed5fcad7e32c44fff268a3650b01e91;hpb=619530eae404977e45f4779b481d88558ad957e2;p=sbcl.git

diff --git a/src/compiler/x86-64/backend-parms.lisp b/src/compiler/x86-64/backend-parms.lisp
index 1d5f418..33ffb6e 100644
--- a/src/compiler/x86-64/backend-parms.lisp
+++ b/src/compiler/x86-64/backend-parms.lisp
@@ -35,6 +35,15 @@
 (eval-when (:compile-toplevel :load-toplevel :execute)
   (setf *backend-page-bytes* 32768))
 
-;;; The size in bytes of the GENCGC pages. Should be a multiple of the
-;;; architecture code size.
-(def!constant gencgc-page-bytes *backend-page-bytes*)
+;;; The size in bytes of GENCGC cards, i.e. the granularity at which
+;;; writes to old generations are logged.  With mprotect-based write
+;;; barriers, this must be a multiple of the OS page size.
+(def!constant gencgc-card-bytes *backend-page-bytes*)
+;;; The minimum size of new allocation regions.  While it doesn't
+;;; currently make a lot of sense to have a card size lower than
+;;; the alloc granularity, it will, once we are smarter about finding
+;;; the start of objects.
+(def!constant gencgc-alloc-granularity 0)
+;;; The minimum size at which we release address ranges to the OS.
+;;; This must be a multiple of the OS page size.
+(def!constant gencgc-release-granularity *backend-page-bytes*)