Re: [Xen-devel] [PATCH] Blktap: Userspace file-based image support. (RFC)

["Stephen C. Tweedie" <sct@xxxxxxxxxx>]

Hi,

On Thu, 2006-06-29 at 07:34 -0700, Andrew Warfield wrote:

> The linux libaio stuff is pretty good actually.  Requests map rather
> directly down onto the kernel bio interface, so with aio the userland
> block back code is doing a very similar thing to the in-kernel driver.

Yep.  I noticed that the blktap patch includes adding EPOLL to kernel
aio, though, and that has not (yet) been accepted upstream; is that
something that is absolutely necessary for blktap, or could you live
without it?  

Is there any movement towards getting that upstream, since otherwise
we're introducing dependencies on core kernel infrastructure that is not
guaranteed to persist upstream?  It looks like the sort of thing that
would be entirely reasonable upstream: EPOLL for aio seems to make a ton
of sense.

Cheers, 
 Stephen



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