linux-kernel - Re: [RFC PATCH 0/2] Perf support to SDT markers

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Message-ID: <20130903082503.GA20732@gmail.com>
Date:	Tue, 3 Sep 2013 10:25:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Hemant Kumar Shaw <hkshaw@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com, mingo@...hat.com,
	anton@...hat.com, systemtap@...rceware.org,
	masami.hiramatsu.pt@...achi.com
Subject: Re: [RFC PATCH 0/2] Perf support to SDT markers


* Hemant Kumar Shaw <hkshaw@...ux.vnet.ibm.com> wrote:

> This series adds support to perf to list and probe into the SDT markers.
> The first patch implements listing of all the SDT markers present in
> the ELFs (executables or libraries). The SDT markers are present in the
> .note.stapsdt section of the elf. That section can be traversed to list
> all the markers. Recognition of markers follows the SystemTap approach.
> 
> The second patch will allow perf to probe into these markers. This is
> done by writing the marker name and its offset into the
> uprobe_events file in the tracing directory.
> Then, perf tools can be used to analyze perf.data file.

Please provide a better high level description that explains the history 
and scope of SDT markers, how SDT markers get into binaries, how they can 
be used for probing, a real-life usage example that shows something 
interesting not possible via other ways, etc.

Thanks,

	Ingo
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