It's pretty simple.
http://www.opengroup.org/onlinepubs/007904975/functions/posix_fadvise.html
It's also basically unimplementable without the radix tree, so I don't how
other systems can be doing it. Maybe they just lock up for a day when
someone does fadvise64(fd, 0, -1, FADV_DONTNEED) ;)
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