Re: [Qemu-devel] VM-Migration

[Pradeep Kiruvale]

On 26 April 2017 at 18:14, Dr. David Alan Gilbert <address@hidden>
wrote:

> * Pradeep Kiruvale (address@hidden) wrote:
> > Hi All,
> >
> > Is it possible to enable/disable to migration features on the fly for a
> > qemu VM?
> > I mean through qmp interface kind of a interface?
> >
> > I am asking this because keeping the dirty memory list, this could
> consume
> > some
> > compute and memory. So, the plan is to enable when the VM needs to be
> > migrated.
> >
> > Please clarify.
>
> These bitmaps should already only be allocated during the migration
> process,
> so you shouldn't be seeing any overhead during normal running.
>
> See migration/ram.c ram_save_setup->ram_state_init which allocates
> ram_bitmap and that only happens at the start of migration.
> ram_state_init also calls memory_global_dirty_log_start which does
> the kernel side of it.
>
>
Thanks for the clarification Dave!.

-Pradeep

Dave
>
> > Regards,
> > Pradeep
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>