Re: [PATCH 4/4] Convert irq notifiers lists to RCU locking.

Michael S. Tsirkin
2009-07-13T13:41:49Z

On Mon, Jul 13, 2009 at 04:32:34PM +0300, Gleb Natapov wrote:
> Yeah I understand that other RCU read section may introduce delays too.
> The question is how big the delay may be.

I recall seeing the number "at least 3 jiffies" somewhere, but that
might have changed since.

> I don't think multiple
> milliseconds delay in device de-assignment is a big issue though.

Right. My point was that since the sync is done under kvm lock, the
guest can easily get blocked trying to get kvm lock meanwhile.