[Tmem-devel] Implementing Transcendent Memory on Lguest

[Nitin Gupta]

On 02/08/2010 11:04 PM, Dan Magenheimer wrote:
> 
> I'm not very familiar with virtio but tmem requires synchronous
> data transfer between the "tmem server" (hypervisor) and the
> "tmem client" (guest).  I suspect that virtio assumes an
> asynchronous model.  If a virtio device can be configured
> as a synchronous device then your idea might work.
> 

virtio can be made to work synchronously. For virtio version of
"preswap", refer this:
http://oss.oracle.com/pipermail/tmem-devel/2010-January.txt

It creates "vswap" device which swaps directly over hypervisor.
Pages are transferred to host using virtio in synchronous manner.

(Links to code are at the end of above archived mail)

Nitin



> 
> =============
> 
> From: Gaurav Kukreja [mailto:mailme.gaurav at gmail.com] 
> Sent: Sunday, February 07, 2010 11:11 PM
> To: tmem-devel at oss.oracle.com; rusty at rustcorp.com.au
> Subject: [Tmem-devel] Implementing Transcendent Memory on Lguest
> 
> Hi,
> 
> I have been working on trying to implement Transcendent Memory in lguest. 
> 
> So far, Tmem on lguest is just working very rudimentarily. I am currently working, on virtio balloon driver for the lguest, trying to get it to work.
> 
> I was wondering, and maybe this is vague, whether is it possible to create a implementation of Transcendent Memory, as a Virtio Device. I have read Rusty's paper on Virtio. I am yet to find out of the technical issues regarding the same.
> 
> Let us please evaluate, whether, there would be any benefits of implementing, Transcendent Memory as a Virtio device. I dont know, anything about KVM, but would it then be possible to port Tmem, to KVM easily?
> 
> Regards,
>