Messages in this thread | | | Date | Thu, 18 Dec 2008 22:36:19 +0100 | From | "Frédéric Weisbecker" <> | Subject | Re: [PATCH v2] tracing/function-graph-tracer: prevent from hrtimer interrupt infinite loop |
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2008/12/18 Ingo Molnar <mingo@elte.hu>: > > * Frédéric Weisbecker <fweisbec@gmail.com> wrote: > >> 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?
Yes.
> 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 >
Oh ok I see. Sorry I'm a bit slow today... So the solution would be to adapt dynamically the timeout between hrtimer irq. But I don't know that much hrtimer to implement such a feature... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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