X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86-64%2Fbackend-parms.lisp;h=33ffb6ec64a97387dc4aa06af45bc6885356a811;hb=f3491f128307938cc56367f739b8fbf9e5d503b6;hp=8e9e67b676b94e90e08457d04453942dc5482fcf;hpb=2db410feb35e7e30c95af8f20f67e6177fa92488;p=sbcl.git

diff --git a/src/compiler/x86-64/backend-parms.lisp b/src/compiler/x86-64/backend-parms.lisp
index 8e9e67b..33ffb6e 100644
--- a/src/compiler/x86-64/backend-parms.lisp
+++ b/src/compiler/x86-64/backend-parms.lisp
@@ -33,8 +33,17 @@
 ;;; compatible systems to return different values for getpagesize().
 ;;; -- JES, 2007-01-06
 (eval-when (:compile-toplevel :load-toplevel :execute)
-  (setf *backend-page-bytes* 4096))
+  (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*)