diff options
| author | Ian Rogers <irogers@google.com> | 2025-12-03 13:47:04 -0800 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-12-04 00:36:14 -0800 |
| commit | c9a8c343ef2f9769a33650b7429f5a83ecba8380 (patch) | |
| tree | cd6975d71f15a2ad3ad603cc17daea28dba67852 | |
| parent | 279b5a85ebdd17b8e6713583d0ad6cf00f53eb10 (diff) | |
perf stat: When no events, don't report an error if there is none
Events may fail to open as no supported CPUs were specified on the
command line. In this case a confusing "error" message of "success"
can be reported. Let's skip the error in that case.
Before:
```
$ perf stat -C2048 -e cycles -- true
WARNING: A requested CPU in '2048' is not supported by PMU 'cpu' (CPUs 0-7) for event 'cycles'
Error:
No supported events found.
The sys_perf_event_open() syscall returned with 0 (Success) for event (cpu/unknown-hardware/).
"dmesg | grep -i perf" may provide additional information.
```
After:
```
$ perf stat -C2048 -e cycles -- true
WARNING: A requested CPU in '2048' is not supported by PMU 'cpu' (CPUs 0-7) for event 'cycles'
Error:
No supported events found.
```
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
| -rw-r--r-- | tools/perf/builtin-stat.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 6410115ed9c5..bd3c3de8d200 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -924,8 +924,10 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) } } if (!has_supported_counters && !stat_config.null_run) { - evsel__open_strerror(evlist__first(evsel_list), &target, open_err, - msg, sizeof(msg)); + if (open_err) { + evsel__open_strerror(evlist__first(evsel_list), &target, open_err, + msg, sizeof(msg)); + } ui__error("No supported events found.\n%s\n", msg); if (child_pid != -1) |