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authorAndi Kleen <ak@linux.intel.com>2014-03-25 10:31:38 -0700
committerJiri Olsa <jolsa@redhat.com>2014-04-14 12:56:06 +0200
commit90f6bb6c98ffef42125d7be6d4612505f561fbce (patch)
treeced6c6aec5b237776dc76df8b63d4c5912a00ebe /tools/perf
parent40ba93e3aa001246110320edbe8cf2eb488c1fe7 (diff)
perf stat: Initialize statistics correctly
perf stat did initialize the stats structure used to compute stddev etc. incorrectly. It merely zeroes it. But one member (min) needs to be set to a non zero value. This causes min to be not computed at all. Call init_stats() correctly. It doesn't matter for stat currently because it doesn't use min, but it's still better to do it correctly. The other users of statistics are already correct. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1395768699-16060-1-git-send-email-andi@firstfloor.org Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/builtin-stat.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 8b0e1c9234d..65a151e3606 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -174,13 +174,20 @@ static inline int perf_evsel__nr_cpus(struct perf_evsel *evsel)
static void perf_evsel__reset_stat_priv(struct perf_evsel *evsel)
{
- memset(evsel->priv, 0, sizeof(struct perf_stat));
+ int i;
+ struct perf_stat *ps = evsel->priv;
+
+ for (i = 0; i < 3; i++)
+ init_stats(&ps->res_stats[i]);
}
static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
{
evsel->priv = zalloc(sizeof(struct perf_stat));
- return evsel->priv == NULL ? -ENOMEM : 0;
+ if (evsel == NULL)
+ return -ENOMEM;
+ perf_evsel__reset_stat_priv(evsel);
+ return 0;
}
static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)