2010-07-27  Andreas Schwab  <schwab@redhat.com>

	* manual/memory.texi (Malloc Tunable Parameters): Document

	M_PERTURB.

Index: glibc-2.12-2-gc4ccff1/manual/memory.texi

===================================================================

--- glibc-2.12-2-gc4ccff1.orig/manual/memory.texi

+++ glibc-2.12-2-gc4ccff1/manual/memory.texi

@@ -702,6 +702,11 @@ be allocated via @code{mmap}.

 @item M_MMAP_MAX

 The maximum number of chunks to allocate with @code{mmap}.  Setting this

 to zero disables all use of @code{mmap}.

+@item M_PERTURB

+If non-zero, memory blocks are filled with values depending on some

+low order bits of this parameter when they are allocated (except when

+allocated by @code{calloc}) and freed.  This can be used to debug the

+use of uninitialized or freed heap memory.

 @end table

 @end deftypefun