vSwap + Burst at the same time?

Hey guys, I'm usually the quiet one, but have a discussion with a provider right now in terms of this:

Can you have the following specs for a VPS, at all?:

128MB guaranteed RAM

256MB Burst on top

128MB vSwap just in case

So basically, vSwap and Burst at the same time - possible or not?

I'm only a VPS user, not somebody who works behind the scenes with OpenVZ, hence I ask you guys :-)

And it if is possible, how would it "look like"?

I give you my take, not sure how right or not right it is:

It could be that you can't have both, considering they are "old" and "new" techniques OpenVZ uses afaik. BUT, as I don't know, IF it were possible, it would, from within a VPS look like this:

free -m would show something like this:

 total       used       free     shared    buffers     cached
Mem:           384         50         334          0          0         32
-/+ buffers/cache:         18        366
Swap:          128          0        128

and beancounters would be setup to reflect the assignment of 128MB to guaranteed and the 256MB to Burst. At least that's how a system with Burst and "normal Swap" would look like.

So what do you say guys?

Thanks in advance!!

Samuel