Re: [RFC 0/9] mce recovery for Sandy Bridge server

[Peter Zijlstra]

On Tue, 2011-05-24 at 14:30 -0700, Linus Torvalds wrote:
> On Tue, May 24, 2011 at 2:24 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> >
> > Right, so you can't do things like that from NMI context, but what perf
> > can do is raise a self-IPI and continue from IRQ context (question for
> > the HW folks, can there be cycles between the NMI iret and IRQ assert
> > from whatever context was before the NMI hit?)
> 
> Of course there can be - the code where the NMI hit may have
> interrupts disabled.

D'0h yes of course!..

Then I can't immediately see a way to stop a thread dead in its tracks.
Userspace yes, but not kernel-space.

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