stpd kernel event filtering

[bibo,mao]

Frank Ch. Eigler wrote:
> "Mao, Bibo" <bibo.mao@intel.com> writes:
> 
>> [... Maybe] there should be one additional option in stap. If this
>> option is on, all probepoint related with stpd will be discarded;
>> else user will get all real raw data including stpd process.
> 
> That's a reasonable option.  The translator could emit the explicit
> conditional within the probe prologue, that is as long as the
> conditional can apply generally to all kinds of probes.  Actually,
> "begin" and "end" probes often run from the context of stpd, so they
> would have to skip the check.  And what about timers/profiling ...
> or interrupt handlers?
> 
> - FChE
> 
That actually is one problem, there is no explicit definition whether 
some kernel probepoint in interrupt context should be discarded, because 
   these events have no relation with stpd process.

bibo,mao