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| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-02-13 18:40:58 (GMT) |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-03-02 14:51:17 (GMT) |
| commit | 3b4331d9a4f2d99603c38bfcac79943b7c6c5439 (patch) | |
| tree | 26fbfb1c187379aeb43da02d6218a70ec617340d | |
| parent | c65568c5456e5216e5467e81d1e04c1f5bdd453f (diff) | |
| download | linux-3b4331d9a4f2d99603c38bfcac79943b7c6c5439.tar.xz | |
perf stat: Report unsupported events properly
Commit 1971f59 (perf stat: Use read_counter in read_counter_aggr )
broke the perf stat output for unsupported counters.
$ perf stat -v -a -C 0 -e CCI_400/config=24/ sleep 1
Warning:
CCI_400/config=24/ event is not supported by the kernel.
Performance counter stats for 'system wide':
0 CCI_400/config=24/
1.080265400 seconds time elapsed
Where it used to be :
$ perf stat -v -a -C 0 -e CCI_400/config=24/ sleep 1
Warning:
CCI_400/config=24/ event is not supported by the kernel.
Performance counter stats for 'system wide':
<not supported> CCI_400/config=24/
1.083840675 seconds time elapsed
This patch fixes the issues by checking if the counter is supported,
before reading and logging the counter value.
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Acked-by: David Ahern <dsahern@gmail.com>
Tested-by: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1423852858-8455-1-git-send-email-suzuki.poulose@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/builtin-stat.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index e598e4e..d28949d 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -510,6 +510,9 @@ static int read_counter(struct perf_evsel *counter) int ncpus = perf_evsel__nr_cpus(counter); int cpu, thread; + if (!counter->supported) + return -ENOENT; + if (counter->system_wide) nthreads = 1; @@ -1285,7 +1288,7 @@ static void print_counter_aggr(struct perf_evsel *counter, char *prefix) if (prefix) fprintf(output, "%s", prefix); - if (scaled == -1) { + if (scaled == -1 || !counter->supported) { fprintf(output, "%*s%s", csv_output ? 0 : 18, counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED, |