[Durham] Swap usage by process

[Oliver Burnett-Hall]

This one's for Dougie following this week's meeting -- the attached file
is a better script for analysing swap usage as reported
by /proc/*/smaps.

Save it somewhere, chmod it so that it's executable, and run it
(possibly via sudo if you can't read all of the files in /proc/*/smaps)
and it will output swap usage (in kB), process PID and process name.
You can bung it though sort -n to order by swap usage.

Random note 1: http://weather.ou.edu/~apw/projects/stress/ (which is in
the Debian archives as package 'stress') was very useful for making my
system return non-zero results with this script.

Random note 2: I haven't programmed in perl in a couple of years, and
I've forgotten *everything*.  Writing that script was far harder than
it should have been, and I completely failed to come up with a utterly
obfuscated one-liner, which was my real goal.

Random note 3: I've absolutely no idea how accurate the smaps
information is.  Google might know that.

- olly
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