Messages in this thread | | | Subject | Re: [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os | From | Peter Zijlstra <> | Date | Wed, 09 Jun 2010 12:08:42 +0200 |
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On Wed, 2010-06-09 at 12:41 +0300, Avi Kivity wrote: > > >> Disabling the watchdog is unfortunate. Why is it necessary? > >> > > perf always uses NMI, so we disable the nmi_watchdog when a perf_event is > > set up in case they might have impact. > > > > Ok. Is that the case for the hardware pmus as well? If so it might be > done in common code.
The x86 hardware pmu implementation disables the lapic watchdog too, but recent kernels come with a watchdog implementation on top of perf, the old lapic one will be depricated.
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