Tracepoints are not visible in "perf list" on Fedora 19 because regular
users have no permission to /sys/kernel/debug by default. Show an error
message so that the user knows about it instead of assuming that
tracepoints are not supported on the system.
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Pekka Enberg <penb...@kernel.org>
---
tools/perf/util/parse-events.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9812531..c90e55c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -998,8 +998,10 @@ void print_tracepoint_events(const char *subsys_glob,
const char *event_glob,
char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN];
- if (debugfs_valid_mountpoint(tracing_events_path))
+ if (debugfs_valid_mountpoint(tracing_events_path)) {
+ printf(" [ Tracepoints not available: %s ]\n",
strerror(errno));
return;
+ }
sys_dir = opendir(tracing_events_path);
if (!sys_dir)
--
1.8.3.1
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