Nathan Whitehorn 598d99ddee Keep track of PVO entries in each pmap, which allows much faster
pmap_remove() for large sparse requests. This can prevent pmap_remove()
operations on 64-bit process destruction or swapout that would take
several hundred times the lifetime of the universe to complete. This
behavior is largely indistinguishable from a hang.
2011-12-11 17:19:48 +00:00
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