linux-kernel - Re: [PATCHv2 06/13] perf record: Store data mmaps for dwarf unwind

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Date:	Thu, 7 Jan 2016 22:14:14 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Noel Grandin <noelgrandin@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCHv2 06/13] perf record: Store data mmaps for dwarf unwind

On Thu, Jan 07, 2016 at 01:39:28PM +0100, Jiri Olsa wrote:
> Currently we don't synthesize data mmap by default. It depends
> on -d option, that enables data address sampling.
> 
> But we've seen cases (softice) where DWARF unwinder went through
> non executable mmaps, which we need to lookup in MAP__VARIABLE tree.
> 
> Making data mmaps to be synthesized for dwarf unwind as well.
> 
> Reported-by: Noel Grandin <noelgrandin@...il.com>
> Link: http://lkml.kernel.org/n/tip-lh02yir6qfycn8zr892rmlgg@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-record.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 9c5cdc2c4471..465bde77f49b 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -815,8 +815,11 @@ int record_parse_callchain_opt(const struct option *opt,
>  	}
>  
>  	ret = parse_callchain_record_opt(arg, &callchain_param);
> -	if (!ret)
> +	if (!ret) {
> +		/* Enable data address sampling for DWARF unwind. */
> +		record->sample_address = true;

How does it guarantee that it enables data address sampling only for
DWARF unwind?  Maybe you want this?

		if (callchain_param.record_mode == CALLCHAIN_DWARF)
			record->sample_address = true;


Thanks,
Namhyung


>  		callchain_debug();
> +	}
>  
>  	return ret;
>  }
> -- 
> 2.4.3
> 
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