If we don't flush the smp tlb don't we risk that we'll insert pages in
the unstable tree that are volatile just because the dirty bit didn't
get set again on the spte?
Yes, this is the trade off we take, the unstable tree will be flushed
anyway -
so this is nothing that won`t be recovered very soon after it happen...
and most of the chances the tlb will be flushed before ksm get there anyway
(specially for heavily modified page, that we don`t want in the unstable
tree)
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