On Sat, Jun 30, 2018 at 01:45:29AM +0000, Gonglei (Arei) wrote: > Hi Peter, > > As we discussed in LC3 China, the current scheme of "migration to file" > can't fit on production environment, which will cause the snapshot file > bigger > and bigger when the guest is under enough memory pressure. We can't > assume what size the snapshot file is. > > Pls have a look if we have a simple method to resolve the problem. :)
Yeah, it seems that the requirement of this live snapshot feature is there for a long time but we haven't yet figured out a good way to solve it. > > PS: the below link is zhanghailiang's scheme based on userfaultfd. > > https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg00664.html Thanks for the pointer! Just to mention that there is another ongoing work from Denis that implemented similar feature but with mprotect() and a new (to-be-proposed?) kvm interface: http://lists.gnu.org/archive/html/qemu-devel/2018-06/msg08684.html Hopefully we can figure something out soon on the list. Regards, -- Peter Xu
