Re: [Qemu-devel] [PATCH RFC 0/3] Checkpoint-assisted migration proposal

[Amit Shah <amit.shah@redhat.com>]

Hi,

On (Fri) 17 Apr 2015 [14:12:59], Bohdan Trach wrote:
> From: Bohdan Trach <bohdan.trach@mailbox.tu-dresden.de>
> 
> This patchset contains a checkpoint-assisted migration feature as
> proposed earlier on this list [1]. It allows reusing existing memory
> snapshots of guests to speed up migration of VMs between physical
> hosts.
> 
> [1] https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg01555.html

Could you please include a file in the docs/ directory that documents
how this works, so it's easier to comment on the general idea?

>From 'checkpointing', I was afraid this was going to use some
checkpoint-restore framework, but instead it's a new checkpointing
method that you're adding to qemu.

Can you describe when checkpoints are taken, and what is checkpointed?
How is it stored on the disk?

I'm sure the patches have all the details, but it's easier to check
the soundness of the idea if there's a high-level doc that explains
this, and then we can discuss the finer points over patches.

Overall, I think this approach can benefit some workloads, and since
it's not affecting a lot of common code, we could look at adding it.

Also, apologies for not getting to this earlier.

Thanks,

		Amit