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| author | Namhyung Kim <namhyung@kernel.org> | 2023-03-15 02:42:36 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-03-15 17:08:36 +0300 |
| commit | 4310551b76e0d6762abb78fc23d50dcc3c608c33 (patch) | |
| tree | 4efd16aeba005ecea51ea00e35efaccc7280dcbb /tools/perf/builtin-record.c | |
| parent | 46996dd7f655889a3dbbb514a0fa8bb614d6bd74 (diff) | |
| download | linux-4310551b76e0d6762abb78fc23d50dcc3c608c33.tar.xz | |
perf bpf filter: Show warning for missing sample flags
For a BPF filter to work properly, users need to provide appropriate
options to enable the sample types. Otherwise the BPF program would
see an invalid value (i.e. always 0) and filter won't work well.
Show a warning message if sample types are missing like below.
$ sudo ./perf record -e cycles --filter 'addr < 100' true
Error: cycles event does not have PERF_SAMPLE_ADDR
Hint: please add -d option to perf record.
failed to set filter "BPF" on event cycles with 22 (Invalid argument)
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Song Liu <song@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230314234237.3008956-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 6df8b823859d..7b7e74a56346 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1353,7 +1353,7 @@ try_again: if (evlist__apply_filters(evlist, &pos)) { pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n", - pos->filter, evsel__name(pos), errno, + pos->filter ?: "BPF", evsel__name(pos), errno, str_error_r(errno, msg, sizeof(msg))); rc = -1; goto out; |