Re: [Xen-devel] [RFC PATCH V3] Implement 3-level event channel in Xen

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Feb 27, 2013 at 07:49:34PM +0000, Keir Fraser wrote:
> On 27/02/2013 17:01, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> 
> >>>> On 27.02.13 at 15:33, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> >> Keir, Jan, Ian and David, are you happy with this design in general? I 
> >> would
> >> like to have explicit ACK / NACK on this if possible, as feature freeze for
> >> 4.3 is quite close now.
> > 
> > The patches look reasonable (apart from the comments I just gave
> > on some of them), but other than Keir I'm not that eager to see this
> > one go in for 4.3 in order to then likely be replaced by an
> > implementation of David's design in the 4.4 cycle.
> 
> If this went in for 4.3, a re-design would really have to be implemented and
> measurably prove its worth to make it in as another replacement.
> 

Even this design does not go in for 4.3, any new design will still have
to be implemented and measurable prove its worth, as with this design.

The value of this design lies in that a) it's straight forward, easy to
prove its correctness (or wrongness), b) it meets our need for now, c)
a new interface will always be necessary, be it this design or any other
design, d) it buys time for any better designs to become mature.

I understand your (and Jan's) concern for burdens of maintaining
different ABIs, that's why the interface has been made to allow user to
query enabled / supported ABIs. If we need to add / remove ABIs, it's
just a matter of setting some feature bits.

I don't mean to push this design to get merged, it's up to maintainers
to decide. Actually I'm fine with any decision. Explicit Ack / Nack will
help me arrange my future work better.


Wei.

>  -- Keir
> 
> > Jan
> > 
> 
> 

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