linux-kernel - [tip:perf/core] perf record: Store data mmaps for dwarf unwind

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Date:	Sat, 9 Jan 2016 08:42:21 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, jolsa@...nel.org,
	namhyung@...nel.org, mingo@...nel.org, acme@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, dsahern@...il.com,
	noelgrandin@...il.com, hpa@...or.com, adrian.hunter@...el.com,
	jolsa@...hat.com
Subject: [tip:perf/core] perf record: Store data mmaps for dwarf unwind

Commit-ID:  5c0cf22477eaa890beeb4bc3554e5bebbea4b007
Gitweb:     http://git.kernel.org/tip/5c0cf22477eaa890beeb4bc3554e5bebbea4b007
Author:     Jiri Olsa <jolsa@...hat.com>
AuthorDate: Thu, 7 Jan 2016 14:30:22 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 8 Jan 2016 14:17:45 -0300

perf record: Store data mmaps for dwarf unwind

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>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20160107133022.GA32115@krava.brq.redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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 9c5cdc2c4..dc4e0ad 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;
 }