Re: [Xen-devel] Xen spinlock questions

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Keir Fraser wrote:
> On 11/8/08 19:49, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:
>
>   
> > Keir Fraser wrote:
> >     
> > > That's right. The hypercall returns if any event is delivered to the vcpu,
> > > or if any port in the poll set is pending. The fact we don't clear the vcpu
> > > from the poll_mask if unblocked for event delivery isn't a correctness
> > > issue, but it will cause unnecessary extra work in future invocations of
> > > evtchn_set_pending(). Perhaps vcpu_unblock() should clear it.
> > >   
> > >       
> > That seems reasonable.  In this use-case, it's quite likely that if the
> > poll is interrupted by event delivery, on return it will find that the
> > spinlock is now free and never re-enter the poll.
> >     
> Attached is a new version of the patch which clears the vcpu from poll_mask
> when it is unblocked for any reason. Jan: please can you give this one a
> spin if you get time.
>   
Forgot to attach?

   J

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel