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perf stat: Additional verbose details for <not supported> events

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If an event shows as "<not supported>" in perf stat output, in verbose
mode add the strerror output to help diagnose the issue.

Consider:
```
$ perf stat -e cycles,data_read,instructions true

 Performance counter stats for 'true':

           357,457      cycles:u
   <not supported> MiB  data_read:u
           156,182      instructions:u                   #    0.44  insn per cycle

       0.001250315 seconds time elapsed

       0.001283000 seconds user
       0.000000000 seconds sys
```

To understand why the data_read uncore event failed you can run it
again with -v option.  This change adds detailed message about the
error and suggestion how to fix it potentially.

  Warning:
  data_read:u event is not supported by the kernel.
  Invalid event (data_read:u) in per-thread mode, enable system wide with '-a'.

Signed-off-by: Ian Rogers <irogers@google.com>
[ simplified the commit message ]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers 2025-10-05 11:14:21 -07:00 committed by Namhyung Kim
parent 4b5dafe616
commit 12690401a4
1 changed files with 7 additions and 5 deletions
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12
tools/perf/builtin-stat.c
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@ -624,8 +624,9 @@ static enum counter_recovery stat_handle_error(struct evsel *counter, int err)
*/
if (err == EINVAL || err == ENOSYS || err == ENOENT || err == ENXIO) {
if (verbose > 0) {
ui__warning("%s event is not supported by the kernel.\n",
evsel__name(counter));
evsel__open_strerror(counter, &target, err, msg, sizeof(msg));
ui__warning("%s event is not supported by the kernel.\n%s\n",
evsel__name(counter), msg);
}
return COUNTER_SKIP;
}
@ -649,10 +650,11 @@ static enum counter_recovery stat_handle_error(struct evsel *counter, int err)
}
}
if (verbose > 0) {
evsel__open_strerror(counter, &target, err, msg, sizeof(msg));
ui__warning(err == EOPNOTSUPP
? "%s event is not supported by the kernel.\n"
: "skipping event %s that kernel failed to open.\n",
evsel__name(counter));
? "%s event is not supported by the kernel.\n%s\n"
: "skipping event %s that kernel failed to open.\n%s\n",
evsel__name(counter), msg);
}
return COUNTER_SKIP;
}