linux-kernel - [PATCH 1/2] perf tools: Compare dso's also when comparing symbols

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Date:	Tue, 15 Oct 2013 11:01:56 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: [PATCH 1/2] perf tools: Compare dso's also when comparing symbols

From: Namhyung Kim <namhyung.kim@....com>

Linus reported that sometimes 'perf report -s symbol' exits without
any message on TUI.  David and Jiri found that it's because it failed
to add a hist entry due to an invalid symbol length.

It turns out that sorting by symbol (address) was broken since it only
compares symbol addresses.  The symbol address is a relative address
within a dso thus just checking its address can result in merging
unrelated symbols together.  Fix it by checking dso before comparing
symbol address.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/sort.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 32c56377e008..1f9821db9e77 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -182,9 +182,19 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r)
 static int64_t
 sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
 {
+	int64_t ret;
+
 	if (!left->ms.sym && !right->ms.sym)
 		return right->level - left->level;
 
+	/*
+	 * comparing symbol address alone is not enough since it's a
+	 * relative address within a dso.
+	 */
+	ret = sort__dso_cmp(left, right);
+	if (ret != 0)
+		return ret;
+
 	return _sort__sym_cmp(left->ms.sym, right->ms.sym);
 }
 
-- 
1.7.11.7

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