find page size and number of pages of a process in linux

Question

Given a PID of the process running in Linux (latest kernel), how do I find out:

1. The number of pages it is using
2. The size of each page it is using (4K, 2MB or 1GB)

This is for x86-64 architecture

Answer 1

Depending on how verbose the information you want should be, you want one of the following:

• /proc/pid/statm: Provides information about memory usage, measured in pages.
• /proc/pid/status: Provides much of the information from /proc/pid/statm, but is easier to read.

Check out the man-page for the proc-files for thorough documentation of what the different columns mean.

• http://linux.die.net/man/5/proc

Answer 2

Pagesize is system wide and can be found with the getconf command

getconf PAGESIZE

The mem_usage.py tool can provide some more detailed information on a processes memory usage.

Answer 3

The number of pages it is using

awk '{ print $24 }' /proc/[pid]/stat

or:

awk '{ print $2 }' /proc/[pid]/statm

According to the man proc, it is the number of pages the process has in real memory. Also take a look at the procstat.c to display proc stat in human readable format.