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SubjectRe: fadvise DONTNEED implementation (or lack thereof)
> > I wonder what's the problem in Peter's patch 'drop behind'.
> >
> >
> > Could anyone tell me why it can't accept upstream?
> Read the thread, its quite clear nobody got convinced it was a good idea
> and wanted to fix the use-once policy, then Rik rewrote all of
> page-reclaim.

If my understand is correct, rsync touch data twice (for a hash calculation
and for a copy). then, currect used-once-heuristics seems still doesn't work.

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