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Re: [Xen-users] Transcendent Memory ("tmem") -capable kernel now publicly released

On 4/16/2012 12:40 PM, Dan Magenheimer wrote:
Hi Psusi (Phillip?) - Just saw your tmem post... sorry I don't keep
up with xen-users.   If you are looking at implementing Xen tmem
support on/for a future Ubuntu release, let me know if I can help and

The last time I played with it I think I managed to get it working after adding the "tmem" command line arguments to xen and the guest kernel. What I have not been able to do is figure out how to monitor its usage/effectiveness. The output of xm tmem was completely indecipherable. Could you shed some light on that?

Also I was wondering about how pages move back and forth between cleancache and pagecache. Are they copied or moved back and forth? In other words, is the data placed in cleancache only once the local pagecache discards it, or as soon as it is read from disk, and when it is later requested, is it copied back from cleancache to the local pagecache, thus resulting in the data being duplicated in memory, once for the guest, and once in tmem?

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