Re: [PATCH] kvm tools: Add MMIO coalescing support

[Ingo Molnar <mingo@elte.hu>]

* Sasha Levin <levinsasha928@gmail.com> wrote:

> Coalescing MMIO allows us to avoid an exit every time we have a
> MMIO write, instead - MMIO writes are coalesced in a ring which
> can be flushed once an exit for a different reason is needed.
> A MMIO exit is also trigged once the ring is full.
> 
> Coalesce all MMIO regions registered in the MMIO mapper.
> Add a coalescing handler under kvm_cpu.

Does this have any effect on latency? I.e. does the guest side 
guarantee that the pending queue will be flushed after a group of 
updates have been done?

Thanks,

	Ingo