From 3b4331d9a4f2d99603c38bfcac79943b7c6c5439 Mon Sep 17 00:00:00 2001 From: "Suzuki K. Poulose" Date: Fri, 13 Feb 2015 18:40:58 +0000 Subject: [PATCH] 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': 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 Acked-by: David Ahern Tested-by: David Ahern Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1423852858-8455-1-git-send-email-suzuki.poulose@arm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-stat.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index e598e4e98170..d28949d210cc 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,