[Valgrind-users] Valgrind to map all memory access?

[David G. <wi...@ho...>]

Hi,
is there something in the Valgrind tools that will give me some kind
of map of all memory accesses?  I have a chunk of memory and I want to
know what parts of it are read from, which are written to, and which
are never touched at all.  Cachegrind seems to almost do this, it
takes counts of when memory read/write occurs but in addition to the
count I also need to know the exact location that it is accessing.
Does this functionality exist somewhere in the toolset and I just
can't find it?
Thanks!