Certainly you can further fields without breaking (well-written) apps. That's
what the first line in /proc/partitions is for. When adding a new column,
you also give it a new tag in the header. Ask RedHat how many apps broke
when they started patching sard into their kernels.
Adding new fields is even easier with /proc/stat-style key:value pairs. Both
styles are human- as well as machine readable. Problems only arise when
someone changes the semantics of a certain field without changing the tag.
But luckily these kinds of changes never happen in a stable kernel series...
Regards,
Daniel.
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