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perf list pfm: Retry supported test with exclude_kernel

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With paranoia set at 2 evsel__open will fail with EACCES for non-root
users. To avoid this stopping libpfm4 events from being printed, retry
with exclude_kernel enabled - copying the regular is_event_supported
test.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20230906234416.3472339-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-09-06 16:44:16 -07:00 committed by Arnaldo Carvalho de Melo
parent 4f19fc1839
commit 6bd8c2ea6b
1 changed files with 14 additions and 1 deletions
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15
tools/perf/util/pfm.c
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@ -145,7 +145,20 @@ static bool is_libpfm_event_supported(const char *name, struct perf_cpu_map *cpu
evsel->is_libpfm_event = true;
if (evsel__open(evsel, cpus, threads) < 0)
ret = evsel__open(evsel, cpus, threads);
if (ret == -EACCES) {
/*
* This happens if the paranoid value
* /proc/sys/kernel/perf_event_paranoid is set to 2
* Re-run with exclude_kernel set; we don't do that
* by default as some ARM machines do not support it.
*
*/
evsel->core.attr.exclude_kernel = 1;
ret = evsel__open(evsel, cpus, threads);
}
if (ret < 0)
result = false;
evsel__close(evsel);