perf stat: Fail softly on unsupported events

David Ahern reported this perf stat failure:

> # /tmp/build-perf/perf stat -- sleep 1
>   Error: stalled-cycles-frontend event is not supported.
>   Fatal: Not all events could be opened.
>
> This is a Dell R410 with an E5620 processor.

Fail in a softer fashion on unknown/unsupported events.

Reported-by: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-7y40wib8n006io7hjpn1dsrm@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 3 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9e596ab98d0..c8b535bc27b 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -377,7 +377,7 @@ static int run_perf_stat(int argc __used, const char **argv)
 
         list_for_each_entry(counter, &evsel_list->entries, node) {
                 if (create_perf_stat_counter(counter) < 0) {
-                        if (errno == EINVAL || errno == ENOSYS)
+                        if (errno == EINVAL || errno == ENOSYS || errno == ENOENT)
                                 continue;
 
                         if (errno == EPERM || errno == EACCES) {
@@ -385,8 +385,6 @@ static int run_perf_stat(int argc __used, const char **argv)
                                       "\t Consider tweaking"
                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
                                       system_wide ? "system-wide " : "");
-                        } else if (errno == ENOENT) {
-                                error("%s event is not supported. ", event_name(counter));
                         } else {
                                 error("open_counter returned with %d (%s). "
                                       "/bin/dmesg may provide additional information.\n",