Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

[Peter Zijlstra]

On Tue, 2012-07-10 at 10:21 +0200, Ingo Molnar wrote:
> Another boundary condition would be when we intentionally 
> twiddle the GDT: such as during suspend or during BIOS upcalls. 
> Can we then get a PMU interrupt? If yes then this will probably 
> result in garbage:
> 
> > > > +             desc = __this_cpu_ptr(&gdt_page.gdt[0]);
> 
> it won't outright crash, we don't ever deallocate our GDT - but 
> it will return a garbage RIP.

Nothing we can do about that though..

> Then there's also all the Xen craziness with segments ...

I don't think Xen Dom0 has PMU access, that would be their Hyper-visor
thingy's job, no?

Anyway, that seems a problem for Jeremy and Konrad..
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