Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs

Ingo Molnar
2010-08-25T11:20:00Z

* Robert Richter <robert.richter@amd.com> wrote:

> On 25.08.10 06:41:30, Ingo Molnar wrote:
>
> > > > > > Uhhuh. NMI received for unknown reason 00 on CPU 9.
> > > > > > Do you have a strange power saving mode enabled?
> > > > > > Dazed and confused, but trying to continue
> >
> > Before the two patches i did not get these messages at all, on any
> > of the systems.
>
> Yes, because all were eaten by NOTIFY_STOP, and that's why we also
> lose NMIs from other sources, like the nmi button. The patches try to
> fix this.

I understand that, but obviously the patches need to fix the lack of
messages without introducing new regressions: such as messages not seen
before and CPUs with stuck NMIs.

Thanks,

Ingo