[Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking

[Don Zickus <dzickus@xxxxxxxxxx>]

On Tue, Sep 13, 2011 at 09:03:20PM +0200, Andi Kleen wrote:
> > So I got around to implementing this and it seems to work great.  The back
> > to back NMIs are detected properly using the %rip and that info is passed to
> > the NMI notifier.  That info is used to determine if only the first
> > handler to report 'handled' is executed or _all_ the handlers are
> > executed.
> > 
> > I think all the 'unknown' NMIs I generated with various perf runs have
> > disappeared.  I'll post a new version of my nmi notifier rewrite soon.
> 
> This will fail when the system is idle.

Oh one other thing I forgot to mention is that an NMI handler has to
return a value greater than 1, meaning that it handle multiple NMI events
during this NMI to even enable the 'NMI swallowing' algorithm.

Cheers,
Don

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