[ltt-dev] tracepoint layer and marker layer

[KOSAKI Motohiro]

Hi

> 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?