[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] PV hugepages - Xen patch
On Wednesday 08 October 2008, Keir Fraser wrote: > On 8/10/08 18:05, "Dave McCracken" <dcm@xxxxxxxx> wrote: > > On Friday 03 October 2008, Keir Fraser wrote: > >> * This surely breaks save/restore, since the restore code is not > >> superpage-aware. > > > > I don't have this one solved yet. I'm working on it. > > Actually this is an interesting one. For a PV guest it may be in general > unsolvable, since the target machine may not have allocatable 2MB extents. > It may also screw live migration since 2MB is a very coarse granularity to > do dirty-page tracking. One option: perhaps the PV kernel could shatter and > then reconstruct (as best it can) superpage mappings across save/restore? > I'm actually not sure what's for the best here. Perhaps just make 2MB > mappings and save/restore mutually exclusive for now? Yeah, that's what I'm finding. I think it's a good idea to document for now that hugepages don't work with save/restore. I'll continue to dig into it and try to figure out a scheme to make it work as a future enhancement. Dave McCracken _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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