Re: [Qemu-devel] [RFC] Memory API

[Avi Kivity]

On 05/19/2011 04:23 PM, Anthony Liguori wrote:
> > Actually, things are a bit more complicated: This layer has to properly
> > adopt the coalescing properties of underlying regions or we cause
> > performance regressions to VGA emulation. That means it has to register
> > dispatching slots of the corresponding size and set the coalescing flag
> > accordingly. And it likely need to adjust them as the regions below 
> > change.
>
>
> As I mentioned in another thread, I don't think we want to "design" 
> coalescing into the API.  Coalescing is something that breaks through 
> abstractions layers and is really just a hack.

It's impossible not to design it into the API.  The layer which wants to 
do coalescing (the device) has no idea if and where its memory is mapped.

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