[Linux-Xtensa] Cutoff date coming for Xtensa to swich from ptrace to utrace

[Piet Delaney]

Christoph Hellwig wrote:
> These are the notes and action items for the Tracing roundtable at the
> Linux Foundation Collaboration summit, April 8-10 in San Francisco.
>
> Attendes: Renzo Davoli, Mathieu Desnoyers, Jake Edge, Frank Ch. Eigler,
> 	  Christoph Hellwig, Masami Hiramatsu, Jim Keniston,
> 	  Roland McGrath, Steven Rostedt, Josh Stone, Elena Zannoni
>
> Kernel Tracing items:
>
>  - make DEFINE_TRACE work in modules (Steve)
>  - investigate markers removal (Christoph, Matthew)
>  - the 25 magic google tracpoints (Matthew)
>  - make the two major tracepoint implementations interchangeable
>    at the API level (Matthew, Steve)
>  - get djprobes and the instruction decoder upstream (Masami)
>
> Utrace and userspace probing:
>
>  - get arm and mips converted to regsets and uprobes, set a cut off date
>    for others (Christoph, Roland)
>   
NOTE: This means a cut off date for xtensa switching to utrace.
After witch I assume gdb will no longer work in user space.

-piet