[tip:perf/core] perf header: Use evlist-> nr_entries on write_event_desc()

[tip-bot for Namhyung Kim <namhyung.kim@lge.com>]

Commit-ID:  74ba9e11f02a4ce0c7708dc77d1756b93065e440
Gitweb:     http://git.kernel.org/tip/74ba9e11f02a4ce0c7708dc77d1756b93065e440
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Wed, 5 Sep 2012 14:02:47 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Sep 2012 17:46:03 -0300

perf header: Use evlist->nr_entries on write_event_desc()

Number of events (evsels) in a evlist is kept on nr_entries field
so that we don't need to recalculate it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1346821373-31621-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9696e64..a124b93 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -610,11 +610,10 @@ static int write_event_desc(int fd, struct perf_header *h __used,
 			    struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel;
-	u32 nre = 0, nri, sz;
+	u32 nre, nri, sz;
 	int ret;
 
-	list_for_each_entry(evsel, &evlist->entries, node)
-		nre++;
+	nre = evlist->nr_entries;
 
 	/*
 	 * write number of events