Tracepoints

Hi,

Here is the new tracepoint infrastructure, heavily inspired from the Markers. It
applies on 2.6.26-rc8. I also post my fs/ LTTng instrumentation as an example
of the resulting code using tracepoints. Please feel free to comment.

- Tracepoints allow more complete type checking (at compile-time) than markers.
- They allow to connect probes involving in-kernel tracers which must be aware
  of complex types such as "struct task_struct *" (not just a void *).
- They are not meant as a replacement for markers, since they do not allow
  one-liner printk-style addition of tracing statements for debugging purpose.
- They require a declaration in a header file, which creates a nice stable API.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68