Re: [Qemu-devel] Are there plans to achieve ram live Snapshot feature?

[Anthony Liguori]

Chijianchun <address@hidden> writes:

> Now in KVM, when RAM snapshot, vcpus needs stopped, it is Unfriendly 
> restrictions to users.
>
> Are there plans to achieve ram live Snapshot feature?

I think you mean a live version of the savevm command.

You can approximate live migrating to a file, creating an external disk
snapshot, then resuming the guest.

Regards,

Anthony Liguori

>
> in my mind, Snapshots can not occupy additional too much memory, So when the 
> memory needs to be changed, the old memory page is needed to flush to the 
> file first.  But flushing to file is too slower than memory,  and when 
> flushing, the vcpu or VM is need to be paused until finished flushing,  so 
> pause...resume...pause...resume............., more and more slower.
>
> Is this idea feasible? Are there any other thoughts?