[PATCH V2 03/12] perf tools: Improve aux_output not supported error

[Adrian Hunter]

For example:
 Before:
   $ perf record -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -- ls -l
   Error:
   branch-loads: PMU Hardware doesn't support sampling/overflow-interrupts. Try 
'perf stat'
 After:
   $ perf record -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -- ls -l
   Error:
   branch-loads: PMU Hardware doesn't support 'aux_output' feature

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/perf/util/evsel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 80a7f9862aec..6606c1e3b4fe 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2539,6 +2539,10 @@ int evsel__open_strerror(struct evsel *evsel, struct 
target *target,
         "No such device - did you specify an out-of-range profile CPU?");
                break;
        case EOPNOTSUPP:
+               if (evsel->core.attr.aux_output)
+                       return scnprintf(msg, size,
+       "%s: PMU Hardware doesn't support 'aux_output' feature",
+                                        evsel__name(evsel));
                if (evsel->core.attr.sample_period != 0)
                        return scnprintf(msg, size,
        "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 
'perf stat'",
-- 
2.17.1