@node Garbage Collection
@comment node-name, next, previous, up
@section Garbage Collection
+@cindex Garbage collection
SBCL provides additional garbage collection functionality not
-specified by ANSI. Weak pointers allow references to objects to be
-maintained without keeping them from being garbage collected, and
-``finalization'' hooks are available to cause code to be executed when
-an object has been garbage collected. Additionally users can specify
-their own cleanup actions to be executed with garbage collection. See
-also @code{make-hash-table} for information on weak hash tables.
+specified by ANSI.
+
+@include var-sb-ext-star-after-gc-hooks-star.texinfo
+@include fun-sb-ext-gc.texinfo
+
+@subsection Finalization
+@cindex Finalization
+
+Finalization allows code to be executed after an object has been
+garbage collected. This is useful for example for releasing foreign
+memory associated with a Lisp object.
@include fun-sb-ext-finalize.texinfo
@include fun-sb-ext-cancel-finalization.texinfo
+
+@subsection Weak Pointers
+@cindex Weak pointers
+
+Weak pointers allow references to objects to be maintained without
+keeping them from being garbage collected: useful for building caches
+among other things.
+
+Hash tables can also have weak keys and values: @pxref{Hash Table
+Extensions}.
+
@include fun-sb-ext-make-weak-pointer.texinfo
@include fun-sb-ext-weak-pointer-value.texinfo
-@include var-sb-ext-star-after-gc-hooks-star.texinfo
+
+@subsection Introspection and Tuning
+
+@include var-sb-ext-star-gc-run-time-star.texinfo
+@include fun-sb-ext-bytes-consed-between-gcs.texinfo
+@include fun-sb-ext-generation-average-age.texinfo
+@include fun-sb-ext-generation-bytes-allocated.texinfo
+@include fun-sb-ext-generation-bytes-consed-between-gcs.texinfo
+@include fun-sb-ext-generation-minimum-age-before-gc.texinfo
+@include fun-sb-ext-generation-number-of-gcs-before-promotion.texinfo
+@include fun-sb-ext-generation-number-of-gcs.texinfo
+@include fun-sb-ext-get-bytes-consed.texinfo
@node Metaobject Protocol
@comment node-name, next, previous, up
@node Hash Table Extensions
@comment node-name, next, previous, up
@section Hash Table Extensions
+@cindex Hash tables
Hash table extensions supported by SBCL are all controlled by keyword
arguments to @code{make-hash-table}.