Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

From: Srikar Dronamraju
Date: Fri Oct 25 2013 - 08:59:49 EST

Hi Pekka,

> >
> > You can now use it in all perf tools, such as:
> >
> > perf record -e libc:my_event -aR sleep 1
> Is there a technical reason why 'perf list' could not show all the
> available SDT markers on a system and that the 'market to event'
> mapping cannot happen automatically?

Technically feasible. But then we would have to parse each of the
libraries and executables to list them. Right? I am not sure if such a
delay is acceptable.

Also if a binary exists in a path thats is not covered in the default
search, an user might believe that his binary may not have markers.
I know the above reason is more of a user folly than a tooling issue.

> So instead of doing all the command line magic above I'd do:
> perf list
> libc:setjmp [SDT marker]
> and I could just do
> perf record -e libc:setjmp -AR sleep 1
> ?

Thanks and Regards
Srikar Dronamraju

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