Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Mathieu Desnoyers wrote:
* Andrew Morton ([email protected]) wrote:
> Of course, it they are properly designed, the one set of tracepoints could
> be used by different tracing backends - that allows us to separate the
> concepts of "tracepoints" and "tracing backends".

If I try to develop your idea a little further, we could this of dividing the
tracing problem into four layers :

- tracepoints (where the code is instrumented)
  - identifying code
  - accessing data surrounding the code
- tracing backend (how to add the tracepoints)
- tracing infrastructure (what code will serialize the information)
- data extraction (getting the data out to disk, network, ...)

I think you missing user-space post processing which should be also considered part of the problem since the capabilities of post-processing will be limited by the "tracepoints" available. Tracepoints and post-processing are also the problems which need to be address first between the other established tracing projects before going forward with in-kernel solutions.

I think that, if we agree on this segmentation of the problem, this thread is
generally debating on the tracing backends and their respective limitations.
I just want to point out that the patch I have submitted adresses mainly the
"tracing infrastructure" and "data extraction" topics.

This seem like a good idea to dissect the problem since it seem like other important issues relevant to general tracing are being ignore simply because of a dislike of the way LTTng has chosen to implement trace.

-JRS
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