Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples
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- Subject: Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples
- From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
- Date: Tue, 10 Jul 2012 10:52:40 +0200
- Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, hpa@xxxxxxxxx, eranian@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, fweisbec@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, Robert Richter <robert.richter@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- In-reply-to: <20120710082104.GA11187@gmail.com>
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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