Re: [Qemu-devel] [RFC]VM live snapshot proposal

[Wenchao Xia]

于 2014/3/4 17:05, Paolo Bonzini 写道:
> Il 04/03/2014 09:54, Stefan Hajnoczi ha scritto:
> > > Is there any other proposals to implement vm-snapshot?
> > See the discussion by Paolo and Andrea about post-copy migration, which
> > adds kernel memory management features for tracking userspace page
> > faults. Perhaps you can use that infrastructure to trap guest writes.
>
> That infrastructure actually traps guest reads too. But it's fine, as 
> they are a superset of guest writes and the image will still be 
> consistent.
>
> Paolo
I heard that Kernel going to have API to let userspace catch memory 
operation, which originally
can be only caught by kernel code. I am not sure how it is now, but if 
kernel have it, qemu
can use it more gracefully than modifing migration code.