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(parent: cd331e4) | patch

Add a comment documenting the question of whether PrefetchBuffer should

Add a comment documenting the question of whether PrefetchBuffer should
try to protect an already-existing buffer from being evicted. This was
left as an open issue when the posix_fadvise patch was committed. I'm
not sure there's any evidence to justify more work in this area, but we
should have some record about it in the source code.

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