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Re: [Qemu-block] Making QMP 'block-job-cancel' transactionable

From: Kashyap Chamarthy
Subject: Re: [Qemu-block] Making QMP 'block-job-cancel' transactionable
Date: Tue, 28 Mar 2017 17:29:34 +0200
User-agent: Mutt/ (2016-04-01)

On Tue, Mar 28, 2017 at 09:49:40AM -0500, Eric Blake wrote:
> On 03/24/2017 07:34 AM, Kashyap Chamarthy wrote:
> > While debugging some other issue, I happened to stumble across an old
> > libvirt commit[*] that adds support for pivot (whether QEMU should
> > switch to a target copy or not) operation as a result of issuing QMP
> > 'block-job-cancel' to a 'drive-mirror' (in libvirt parlance, "block
> > copy").
> > 
> > In the libvirt commit message[*] Eric Blake writes:
> > 
> >     "[...] There may be potential improvements to the snapshot code to
> >     exploit block copy over multiple disks all at one point in time.
> >     And, if 'block-job-cancel' were made part of 'transaction', you
> >     could copy multiple disks at the same point in time without pausing
> >     the domain. [...]"
> > 
> > I realize that 'block-job-cancel' is currently not part of the
> > @TransactionAction.  Is it worthwhile to do so?
> Yes, it is still worthwhile to make that improvement, although it is
> now 2.10 material.

Thanks for looking, didn't imply that it's for 2.9 (which is in Release
Candidate phase) -- I realize most people are busy with it.  Further
discussion could be had when 2.10 tree opens up.



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