A way to determine a process's “real” memory usage, i.e. private dirty RSS?

Question

Tools like \'ps\' and \'top\' report various kinds of memory usages, such as the VM size and the Resident Set Size. However, none of those are the \"real\" memory usage:

Answer 1

For a question that mentioned Freebsd, surprised no one wrote this yet :

If you want a linux style /proc/PROCESSID/status output, please do the following :

mount -t linprocfs none /proc
cat /proc/PROCESSID/status

Atleast in FreeBSD 7.0, the mounting was not done by default ( 7.0 is a much older release,but for something this basic,the answer was hidden in a mailing list!)