* Frédéric Weisbecker <fweisbec@gmail.com> wrote:

quoted text
> Hmm. No, I just tested by setting 1000 HZ and disabled NOHZ, the system 
> doesn't lockup unless I turn on the function graph tracer.

but that's what we are interested in: the system locks up with HZ=1000 and 
with the tracer on - right?

Which means that it's not some hrtimer problem, but simply the traced 
timer tick takes more than 1 millisecond to execute under this 
virtualization.

	Ingo
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