Re: [PATCH] perf_counter: Fix a race on perf_counter_ctx

[Ingo Molnar]

* Metzger, Markus T <markus.t.metzger@xxxxxxxxx> wrote:

> Well, that would push out the limit a bit, but it would still be 
> quite fragile.
> 
> Currently, I'm not sure that this (i.e. that the interrupt 
> handling takes too long) is the underlying problem of the hangs 
> that I'm seeing.

I havent seen a plausible theory yet about why an actual lockup 
would happen on your box.

Does the timer IRQ perhaps slow down to such a degree that it can 
never make progress and gets re-triggered again and again? We saw 
such things with the function tracer.

Did the sampling of kernel-mode tasks ever work with the old BTS 
code?

	Ingo
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