[libvirt] [PATCH 0/5] Introduce VIR_CONNECT_GET_ALL_DOMAINS_STATS_BEST_EFFORT

[Daniel P. Berrangé]

On Thu, Jun 07, 2018 at 01:59:11PM +0200, Michal Privoznik wrote:
> Problem is, if there is a long standing job on a domain fetching
> statistics might hiccup which might be a problem for mgmt apps that
> query stats every few seconds.
> 
> Orthogonal to this, I think we should break our sync QEMU_JOB_* into two
> separate jobs: one for qemu monitor the other for qemu guest agent.
> Problem is, if thread A grabs QEMU_JOB_MODIFY and talks only to guest
> agent it prevents thread B from grabbing QEMU_JOB_QUERY which wants to
> talk only to qemu monitor. But this is a different can of worms and I
> haven't thought it through completely just yet.

Yeah, I think that is important todo because the guest agent is untrusted
service and so can arbitrarily delay its response to libvirt. Even though
we timeout the agent after a while, we shouldn't really let it delay other
APIs using the monitor.


Regards,
Daniel
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