Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format

[Kevin Wolf]

Am 14.08.2013 um 16:26 hat Kaveh Razavi geschrieben:
> On 08/14/2013 03:50 PM, Alex Bligh wrote:
> > Assuming the cache quota is not exhausted, how do you know how that
> > a VM has finished 'creating' the cache? At any point it might
> > read a bit more from the backing image.
> 
> I was assuming on shutdown.

Wait, so you're not really changing the cache while it's used, but you
only create it once and then use it like a regular backing file?  If so,
the only thing we need to talk about is the creation, because there's no
difference for using it.

Creation can use the existing copy-on-read functionality, and the only
thing you need additionally is a way to turn copy-on-read off at the
right point.

Or do I misunderstand what you're doing?

Kevin