>>> Ed White <edmund.h.wh...@intel.com> 01/13/15 9:03 PM >>> >On 01/13/2015 11:01 AM, Andrew Cooper wrote: >> One thing I have noticed while looking at the #VE stuff that EPT also >> supports A/D tracking, which might be quite a nice optimisation and >> forgo the need for p2m_ram_logdirty, but I think this should be treated >> as an orthogonal item. > >This is far from my area of expertise, but I believe there is code in Xen >to use EPT D bits in migration.
There once was a patch series, but upon asking on the (performance) benefits, the submitting engineer stated that there was no measurable improvement, and hence the series never got applied. Right now PML is being worked on afaik, which from what I can tell will make it a lot easier (compared to scanning the whole tree for set D bits) to collect the modified bitmap when the tool stack asks for it. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
