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 <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9696e64c9dbda5ee729688a8e054237877bdc18e..a124b93281707c42986cff5e510ef1947993f6ed 100644 (file)
--- 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