Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table

[Avi Kivity]

On 11/28/2013 01:31 PM, Paolo Bonzini wrote:
> Il 28/11/2013 12:23, Gleb Natapov ha scritto:
> > > > > > Unless what ? :) Unless reader is scheduled out?
> > > > Yes.  Or unless my brain is scheduled out in the middle of a sentence.
> > So we will have to disable preemption in a reader to prevent big latencies for
> > a writer, no?
> I don't think that's necessary.  The writer itself could also be
> scheduled out, and the reader critical sections are really small.  Let's
> wait for Zhang to try SRCU and report back.

I think readers have preemption disabled already in that context (irqfd 
writes).