Re: [Qemu-devel] [PATCH 0/7 RFC] Localhost live migration

[Stefan Hajnoczi]

On Sun, Jun 16, 2013 at 11:37:26PM +0800, Lei Li wrote:
> 2) Use different mechanism than current live migration.
> 
>    The very basic work flow like:
> 
>        qemu on the source (the source and destination are both on localhost)
>               |
>               V
>            Stop VM
>               |
>               V   
>           Create threads
>               |
>               V
>        Page flipping through vmspice
>               |
>               V
>        MADV_DONTNEED the ram pages which are already flipped
>               |
>               V
>        Migration completes
> 
>    As stopping VM first, we expect/resume the page flipping through vmspice
>    is fast enough to meet *live migration (low downtime).

Nice idea, that would allow low downtime QEMU upgrades.

Stefan