Re: [Qemu-devel] [RFC PATCH v2 10/12] mc: expose tunable parameter for checkpointing frequency

[Juan Quintela <quintela@redhat.com>]

Eric Blake <eblake@redhat.com> wrote:
> On 02/18/2014 01:50 AM, mrhines@linux.vnet.ibm.com wrote:
>> From: "Michael R. Hines" <mrhines@us.ibm.com>

> We're building up a LOT of migrate- tunable commands.  Maybe it's time
> to think about building a more generic migrate-set-parameter, which
> takes both the name of the parameter to set and its value, so that a
> single command serves all parameters, instead of needing a proliferation
> of commands.  Of course, for that to be useful, we also need a way to
> introspect which parameters can be tuned; whereas with the current
> approach of one command per parameter (well, 2 for set vs. get) the
> introspection is based on whether the command exists.

I asked to have that.  My suggestion was that

migrate_set_capability auto-throotle on

So we could add it to new variables without extra change.

And I agree that having a way to read them, and ask what values they
have is a good idea.

Luiz, any good idea about how to do it through QMP?

Having the migration changes is easy, the problem is knowing how we want
them.

Later, Juan.