Re: [Qemu-devel] [PATCH v3 5/7] block: add throttle block filter driver

[Manos Pitsidianakis]

On Tue, Aug 08, 2017 at 05:04:48PM +0200, Alberto Garcia wrote:
> On Tue 08 Aug 2017 04:56:20 PM CEST, Manos Pitsidianakis wrote:
> > > > So basically if we have anonymous groups, we accept limits in the
> > > > driver options but only without a group-name.
> > >
> > > In the commit message you do however have limits and a group name, is
> > > that a mistake?
> > >
> > >    -drive driver=throttle,file.filename=foo.qcow2, \
> > >           limits.iops-total=...,throttle-group=bar
> >
> > Sorry this wasn't clear, I'm actually proposing to remove limits from
> > the throttle driver options and only create/config throttle groups via
> > -object/object-add.
>
> Sorry I think it was me who misunderstood :-) Anyway in the new
> command-line API I would be more inclined to have limits defined using
> "-object throttle-group" and -drive would only reference the group id.
>
> I understand that this implies that it wouldn't be possible to create
> anonymous groups (at least not from the command line), is that a
> problem?

We can accept anonymous groups if a user specifies limits but not a 
group name in the throttle driver. (The only case where limits would be 
acccepted)

Not creating eponymous throttle groups via the throttle driver means we 
don't need throttle_groups anymore, since even anonymous ones don't need 
to be accounted for in a list. I will send a new revision for this 
series but I can make this change in a later patch if everyone agrees.

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