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| author | Andi Kleen <ak@linux.intel.com> | 2014-03-25 10:31:38 -0700 |
|---|---|---|
| committer | Jiri Olsa <jolsa@redhat.com> | 2014-04-14 12:56:06 +0200 |
| commit | 90f6bb6c98ffef42125d7be6d4612505f561fbce (patch) | |
| tree | ced6c6aec5b237776dc76df8b63d4c5912a00ebe /tools | |
| parent | 40ba93e3aa001246110320edbe8cf2eb488c1fe7 (diff) | |
| download | linux-stable-90f6bb6c98ffef42125d7be6d4612505f561fbce.tar.gz linux-stable-90f6bb6c98ffef42125d7be6d4612505f561fbce.tar.bz2 linux-stable-90f6bb6c98ffef42125d7be6d4612505f561fbce.zip | |
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')
| -rw-r--r-- | tools/perf/builtin-stat.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 8b0e1c9234d9..65a151e36067 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) |