Re: [RFC] [PATCH 2/4] dio: add page locking for direct I/O

[Andi Kleen]

On Tue, Aug 17, 2010 at 09:46:56AM -0400, Jeff Moyer wrote:
> Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> writes:
> 
> > BTW, from the discussion with Christoph I noticed my misunderstanding
> > about the necessity of additional page locking. It would seem that
> > without page locking there is no danger of racing between direct I/O and
> > page migration. So I retract this additional locking patch-set.
> 
> OK, great!  ;-)

Well it sounds like we still may need something. It isn't good if O_DIRECT
can starve (or DoS) migration.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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