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perf list: Show error if tracepoints not available

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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.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1381867647-8594-1-git-send-email-penberg@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Pekka Enberg 2013-10-15 23:07:27 +03:00 committed by Arnaldo Carvalho de Melo
parent 243be3dd7c
commit f11cfc6f29
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/parse-events.c
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@ -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)