How to view the memory and swap usage of each process through the proc directory

Can be viewed according to/proc/pid/smap, the value of each of the following contents of the file, add, you can
RSS: Physical memory (can also be seen from PS Axu)
Swap: Virtual Memory

Cat/proc/self/smaps
size:44 KB Virtual Memory size
Rss:28 KB actual use of physical memory size
Pss:28 KB
shared_clean:0 KB page is changed, then is dirty, otherwise is clean, page reference count >1, is shared, otherwise private
shared_dirty:0 KB
Private_clean:28 KB
private_dirty:0 KB
Referenced:28 KB
anonymous:0 KB
anonhugepages:0 KB
swap:0 KB page size in swap area
Kernelpagesize:4 KB Operating System one page size
Mmupagesize:4 KB Architecture MMU one page size
locked:0 KB

How to view the memory and swap usage of each process through the proc directory