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| author |  Ian Rogers <irogers@google.com>
| 2023-09-06 16:44:16 -0700 |
|---|---|---|
| committer |  Arnaldo Carvalho de Melo <acme@redhat.com>
| 2023-09-12 17:32:00 -0300 |
| commit | 6bd8c2ea6b93aabcb4a046ca7a6ad353b574d0a3 (patch) | |
| tree | 2ba405602cbecfa7b2de8f5806ee7c0291f268ff /tools/perf/util/pfm.c | |
| parent | perf list: Avoid a hardcoded cpu PMU name (diff) | |
| download | linux-6bd8c2ea6b93aabcb4a046ca7a6ad353b574d0a3.tar.gz linux-6bd8c2ea6b93aabcb4a046ca7a6ad353b574d0a3.tar.bz2 linux-6bd8c2ea6b93aabcb4a046ca7a6ad353b574d0a3.zip | |
perf list pfm: Retry supported test with exclude_kernel
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>
Diffstat (limited to 'tools/perf/util/pfm.c')
| -rw-r--r-- | tools/perf/util/pfm.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c index 862e4a689868..5ccfe4b64cdf 100644 --- a/tools/perf/util/pfm.c +++ b/tools/perf/util/pfm.c @@ -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); |