Re: [Qemu-devel] [RFC PATCH RDMA support v4: 03/10] more verbose documentation of the RDMA transport

[Michael R. Hines]

Agreed. Very useful for KSM.

Unmapped virtual addresses cannot be pinned for RDMA (the hardware will 
break),
but there's no way to know they are unmapped without checking another 
data structure.

- Michael

On 03/20/2013 04:31 PM, Michael S. Tsirkin wrote:
> OK sure, this could be useful to detect pages deduplicated by KSM and only
> transmit one copy. There's still the question of creating same
> duplicate mappings on destination - do you just do data copy on destination?
>
> Not sure why you talk about unmapped pages above though, it seems
> not really relevant...
>
> There's also the matter of KSM not touching pinned pages,
> that's another good reason not to pin all pages on destination,
> they won't be deduplicated.