Commit c9a8c343 authored by Ian Rogers's avatar Ian Rogers Committed by Namhyung Kim
Browse files

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: default avatarIan Rogers <irogers@google.com>
Tested-by: default avatarThomas Richter <tmricht@linux.ibm.com>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
parent 279b5a85

tools/perf/builtin-stat.c

+4 −2
Original line number Diff line number Diff line
@@ -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) {

		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)