I don't think I've seen this suggestion before...
How about adding a version number as the first entry in every 'file' in the
/proc filesystem. Every time that the format of one of the files
is changed, the version will get incremented.
This would certainly aid people in debugging programs that are based
on the /proc filesystem. Just imagine, no more "ps doesn't work anymore,
what's wrong??". The application could use the version number
and say "The /proc filesystem format has chaned for /proc/xxx. This
program may not function properly anymore. Please upgrade it!"
Mike