I don't think it makes sense to handle something like that with a list.
The compact representation currently in badram is great for that.

I'd tend to agree here.  Rick has made a convincing argument that there
are significant numbers of real world cases where a defective row/column
in a DIMM results in a predictable pattern of errors.  The ball is now
in Google's court to take a look at their systems that have high numbers
of errors to see if they can actually be described by a small number
of BadRAM patterns as Rick has claimed.

-Tony

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