Exmap analyses the memory usage of your processes in a very precise manner, thanks to a kernel module.
The original homepage at http://www.berthels.co.uk/exmap/ is sadly stalled, the author doesn't answer e-mails so far, and its 2006 release of the kernel module does not compile with more recent kernels.
Some updating work was done as part of Debian (cf. archived package), other patches are by myself.
Here's an updated release that I've tested with kernels up to 2.6.34:
Other downloads: download/
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