I wrote a similar thing with a Qt based GUI that, I think, exposes a little more information (more of the kernel's page flags). It reaches a quite respectable update rate for what it's doing (>=40 fps or so?) and it's fun to watch, though I haven't found particularly useful, err, uses.
https://github.com/KDAB/QMemstat
Please put screenshots in your README file because I'd love to see your work! Especially if they're GIFs. Contact me if you want to know the ffmpeg commands I used for memzoom.
