[ltt-dev] tracepoint layer and marker layer

KOSAKI Motohiro kosaki.motohiro at jp.fujitsu.com
Fri Sep 19 14:23:30 EDT 2008


> Hi Folks,
> I have a general question about LTTng kernel code. As I understand, LTTng
> adds an extra tracepoint layer between the traced subsystems and the
> marker layer. The extra code added by the tracepoint layer seems to
> introduce
> noticeable overhead according to my measurements. 

Could you post your mesurement way and result?
My past mesurement indicate tracepoint overhead is ignoreble low.

> I wonder whether it will
> be more efficient and simpler if we let subsystems call the marker layer
> directly?
> Any thought?

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