linux-kernel - [RFC/PATCH 2/2] perf tools: Sort dso using pointers

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Date:	Tue, 15 Oct 2013 11:01:57 +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: [RFC/PATCH 2/2] perf tools: Sort dso using pointers

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

The dso's in a perf session are maintained machine-wide so same dso is
shared by hist entries.  Thus just checking pointer should be enough
to comparing dso's.

It may change behavior of 'perf report -s dso' when there're two or
more dso's that have same basename - the dso's which have same name
used to merged to one unless -v option was given.  But I don't think
it's a big problem. ;)

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/sort.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 1f9821db9e77..70658a0834e3 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -114,20 +114,8 @@ static int64_t _sort__dso_cmp(struct map *map_l, struct map *map_r)
 {
 	struct dso *dso_l = map_l ? map_l->dso : NULL;
 	struct dso *dso_r = map_r ? map_r->dso : NULL;
-	const char *dso_name_l, *dso_name_r;
 
-	if (!dso_l || !dso_r)
-		return cmp_null(dso_l, dso_r);
-
-	if (verbose) {
-		dso_name_l = dso_l->long_name;
-		dso_name_r = dso_r->long_name;
-	} else {
-		dso_name_l = dso_l->short_name;
-		dso_name_r = dso_r->short_name;
-	}
-
-	return strcmp(dso_name_l, dso_name_r);
+	return (int64_t)(dso_l - dso_r);
 }
 
 static int64_t
-- 
1.7.11.7

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