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

From: Pekka Enberg
Date: Fri Oct 25 2013 - 08:38:25 EST

Hello Hemant,

On Wed, Oct 23, 2013 at 7:05 AM, Hemant Kumar <hkshaw@xxxxxxxxxxxxxxxxxx> wrote:
> This allows perf to probe into the sdt markers/notes present in
> the libraries and executables. We try to find the associated location
> and handle prelinking (since, stapsdt notes section is not allocated
> during runtime). Prelinking is handled with the help of base
> section which is allocated during runtime. This address can be compared
> with the address retrieved from the notes' description. If its different,
> we can take this difference and then add to the note's location.
> We can use existing '-a/--add' option to add events for sdt markers.
> Also, we can add multiple events at once using the same '-a' option.
> Usage:
> perf probe -x /lib64/ -a 'my_event=%libc:setjmp'
> Output:
> Added new event:
> libc:my_event (on 0x35981)
> 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?

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


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