linux-kernel - [PATCHv3 06/13] perf record: Store data mmaps for dwarf unwind

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Message-ID: <20160107133022.GA32115@krava.brq.redhat.com>
Date:	Thu, 7 Jan 2016 14:30:22 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
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: [PATCHv3 06/13] perf record: Store data mmaps for dwarf unwind

On Thu, Jan 07, 2016 at 10:14:14PM +0900, Namhyung Kim wrote:
> 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;

ugh.. too much coofee.. :-\ third time's a charm, v3 attached

thanks,
jirka


---
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 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 9c5cdc2c4471..dc4e0adf5c5b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -815,8 +815,12 @@ 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. */
+		if (callchain_param.record_mode == CALLCHAIN_DWARF)
+			record->sample_address = true;
 		callchain_debug();
+	}
 
 	return ret;
 }
-- 
2.4.3

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