On Thu, 12 Aug 2010, Naoya Horiguchi wrote:

quoted text
> > Can you also avoid refcounts being increased during migration?
>
> Yes. I think this will be done in above-mentioned refactoring.

Thats not what I meant. Can you avoid other processors increasing
refcounts (direct I/O etc?) on any page struct of the huge page while
migration is running?

quoted text
> This patch only handles migration under direct I/O.
> For the opposite (direct I/O under migration) it's not true.
> I wrote additional patches (later I'll reply to this email)
> for solving locking problem. Could you review them?

Sure.

quoted text
> (Maybe these patches are beyond the scope of hugepage migration patch,
> so is it better to propose them separately?)

Migration with known races is really not what we want in the kernel.

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