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Re: registration error + probe overhead exceeded threshold error.....
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: Peter Teoh <htmldeveloper at gmail dot com>
- Cc: SystemTAP <systemtap at sources dot redhat dot com>
- Date: Thu, 16 Apr 2009 16:31:41 -0400
- Subject: Re: registration error + probe overhead exceeded threshold error.....
- References: <804dabb00904120909je22e4dei691dcf89cb56c4f5@mail.gmail.com>
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