Linus took itout because it was quite complex and nobody seemed to
have cases that triggered it or made it useful
Hmm... well it seems the are cases which trigger this, mozilla and
vmware being quite common.
Is a less heavy-handed approach than the original code possible?
Something like when inserting into a processes vma, if there are more
than <n> entries, we lock/scan/coalesce/unlock --- or would this
locking be too gross?
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