As far as I know there are several memory concepts: VSS RSS PSS and USS, in which USS(unique set size) is the physical memory exclusively used by a process(correct me if needed).
I think this should be a very useful value to let me know which process uses too many physical memory?
But how could we get this value? By ps or from any /proc file?
(I know a smem tool could help, but is there any built-in method?)