Hi everyone,


https://gerrit.ovirt.org/#/q/topic:drivemonitor_event+status:open is
ready for review. It is the first part of the series needed

to consume the BLOCK_THRESHOLD event available with libvirt >= 3.2.0 and
QEMU >= 2.3.0.

Once completed, this patchset will allow Vdsm to avoid polling, thus
greatly improving the system performance and

eventually close https://bugzilla.redhat.com/show_bug.cgi?id=1181665


Please note that:

1. CI fails because the workers are not yet updated to CentOS 7.4 (not
yet released AFAIK!) which will provide libvirt >= 3.2.0.

2. Few more simple patches will be needed to enable/disable monitoring
in specific flows where we cannot use events (e.g. LSM)

3. I did initial verification successfully, installing fedora 25 on thin
provisioned disk without issue.


--
Francesco Romani
Senior SW Eng., Virtualization R&D
Red Hat
IRC: fromani github: @fromanirh