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Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- From: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- To: Pekka Enberg <penberg at kernel dot org>
- Cc: Hemant Kumar <hkshaw at linux dot vnet dot ibm dot com>, LKML <linux-kernel at vger dot kernel dot org>, Peter Zijlstra <peterz at infradead dot org>, Oleg Nesterov <oleg at redhat dot com>, hegdevasant at linux dot vnet dot ibm dot com, Ingo Molnar <mingo at redhat dot com>, anton at redhat dot com, systemtap at sourceware dot org, Namhyung Kim <namhyung at kernel dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, aravinda at linux dot vnet dot ibm dot com
- Date: Fri, 25 Oct 2013 18:29:21 +0530
- Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- Authentication-results: sourceware.org; auth=none
- References: <20131023044511 dot 1886 dot 82571 dot stgit at hemant-fedora> <20131023050502 dot 1886 dot 15779 dot stgit at hemant-fedora> <CAOJsxLFKm3TxeTmGjbpr1r4sZ8fHcM481-5BM_Cq0J8hhtvBqQ at mail dot gmail dot com>
- Reply-to: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
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