>> Isn't that what madvise(MADV_FREE) is for?
> MADV_FREE doesn't clean the pages if they are dirty.  If you want the
> dirty pages to be cleaned, you need to use MADV_DONTNEED.

Eek.  Might I suggest that madvise(2) be made clearer on this point?
The only description of the functions of the various arguments is a
half-line comment; while I can see what you said in the comments, I
didn't see it there without having read it in advance, and doubtles
others will make the same mistake.

I'd offer to do it myself, except I obviously don't understand the
semantics of the various arguments well enough.

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