linux-kernel - Re: [PATCH 06/17] perf probe: Add --range option to show a variable's location range

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Message-ID: <20150625123057.GA20478@dhcp114.ki.iif.hu>
Date:	Thu, 25 Jun 2015 05:30:58 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Wang Nan <wangnan0@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 06/17] perf probe: Add --range option to show a
 variable's location range

On Thu, May 14, 2015 at 07:37:58PM -0300, Arnaldo Carvalho de Melo wrote:
> From: He Kuang <hekuang@...wei.com>
> 
> It is not easy for users to get the accurate byte offset or the line
> number where a local variable can be probed.
> 
> With '--range' option, local variables in the scope of the probe point
> are showed with a byte offset range, and can be added according to this
> range information.
...
> +	while ((offset = dwarf_getlocations(
> +				&attr, offset, &base,
> +				&start, &end, &op, &nops)) > 0) {

dwarf_getlocations only exists in the new libdw, so perf stopped
building with libdw from ubuntu 12.04.
Yeah, it's old, but can we add a weak dwarf_getlocations(), so
that we don't need to force everyone upgrading elfutils/libdw
for that feature?

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