Re: differences between MADV_FREE and MADV_DONTNEED

[Suleiman Souhlal]

Eric W. Biederman wrote:
> As I recall the logic with DONTNEED was to mark the mapping of
> the page clean so the page didn't need to be swapped out, it could
> just be dropped.
>
> That is why they anonymous and the file backed cases differ.
>
> Part of the point is to avoid the case of swapping the pages out if
> the application doesn't care what is on them anymore.

Well, imho, MADV_DONTNEED should mean "I won't need this anytime soon", 
and MADV_FREE "I will never need this again".

-- Suleiman
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