On Wed, Jan 10, 2018 at 8:15 PM, Dr. David Alan Gilbert <dgilb...@redhat.com> wrote: > * Stefan Hajnoczi (stefa...@gmail.com) wrote: >> On Tue, Jan 9, 2018 at 7:55 PM, Dr. David Alan Gilbert >> <dgilb...@redhat.com> wrote: >> >> Certain guest operations like rebooting or zeroing memory will defeat >> >> the incremental guest RAM snapshot feature. It's worth thinking about >> >> these cases to make sure this feature would be worth it in real use >> >> cases. >> > >> > But those probably wouldn't upset an NVDimm? >> >> If the guest dirties all RAM then the incremental snapshot feature >> degrades to a full snapshot. I'm asking if there are common >> operations where that happens. >> >> I seem to remember Windows guests zero all pages on cold boot. Maybe >> that's not the case anymore. >> >> Worth checking before embarking on this feature because it could be a >> waste of effort if it turns out real-world guests dirty all memory in >> common cases. > > Right, but I'm hoping that there's some magic somewhere where an NVDimm > doesn't > get zero'd because of a cold boot since that would seem to make it > volatile.
This feature isn't specific to NVDIMM though. It would be equally useful for regular RAM. Stefan
