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

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Message-ID: <20131025125921.GA29424@linux.vnet.ibm.com>
Date:	Fri, 25 Oct 2013 18:29:21 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	hegdevasant@...ux.vnet.ibm.com, Ingo Molnar <mingo@...hat.com>,
	anton@...hat.com, systemtap@...rceware.org,
	Namhyung Kim <namhyung@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	aravinda@...ux.vnet.ibm.com
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

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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