Re: [Qemu-devel] about live memory snapshot

[Denis Plotnikov]

On 02.07.2018 13:53, Peter Xu wrote:
> 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:
I recently emailed the patch set with of my approach to the mainstream.
The patch set is called "Background snapshots".

Please, feel free to review it.

Denis

> http://lists.gnu.org/archive/html/qemu-devel/2018-06/msg08684.html
>
> Hopefully we can figure something out soon on the list.
>
> Regards,