On Tue, 2008-08-05 at 12:11 +0100, Mel Gorman wrote:

See, that's great until you start dealing with MAP_SHARED|MAP_ANONYMOUS.
To get that right between children, you end up something very fs-like
when the child needs to fault in a page that is already populated by the
parent. I strongly suspect we end up back at hugetlbfs backing it :/

Yeah, but the case I'm worried about is plain anonymous.  We already
have the fs to back SHARED|ANONYMOUS, and they're not really
anonymous. :)

This patch *really* needs anonymous pages, and it kinda shoehorns them
in with the filesystem.  Stacks aren't shared at all, so this is a
perfect example of where we can forget the fs, right?

-- Dave