Re: [libvirt] [PATCH 11/17] util: Introduce libvirt_udevhelper
On Thu, Oct 27, 2016 at 3:45 PM, Daniel P. Berrange <berrange(a)redhat.com> wrote:
We can not do any sychronous wait against udev doing work - that
will
add an unacceptable delay in the VM startup process - it is already
too long and we don't want to design a system that will make it even
slower.
Note that if implemented it would be very targeted wait for one
specific event. It *won't* be an equivalent of udevadm settle. In
"uncontented" case udev's response should be very quick. Otherwise,
something (e.g. lv resize) is still setting up a block device because
change events are still being processed for it, and if that is the
case, then just spawning qemu and hoping for the best doesn't seem
right to me (disregarding SELinux and permission issues).
Is libvirt really not waiting for udev at all?
Michal