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Re: registration error + probe overhead exceeded threshold error.....


Thank you Frank, let me probe further into your comments......lots of
things to learn :-).....thank you.

On Fri, Apr 17, 2009 at 4:31 AM, Frank Ch. Eigler <fche@redhat.com> wrote:
> Peter Teoh <htmldeveloper@gmail.com> writes:
>
>> While stap my script, i got the following errors - can someone explain why?
>>
>> error 1: ? registration error
>> error 2: ? ERROR: probe overhead exceeded threshold
>>
>> WARNING: probe module("kvm").function("kvm_vcpu_init@arch/x86/kvm/../../../virt/kvm/kvm_main.c:617").call
>> registration error (rc -22)
>
> This can occur normally for functions marked with init/exit/kprobes
> types of annotations. ?It could occur abnormally for other functions,
> but the message doesn't help clarify (PR 10075).
>
>
>> [...]
>> ERROR: probe overhead exceeded threshold
>
> This means that a bunch of probes were in fact registered and
> activated, but they are taking so long to run that overload-detection
> logic was triggered. ?See the stap.1 man page for tuning or disabling
> the thresholds.
>
>
> - FChE
>



-- 
Regards,
Peter Teoh


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