Messages in this thread Patch in this message | | | From | Pekka Enberg <> | Subject | [PATCH] perf list: Show error if tracepoints not available | Date | Tue, 15 Oct 2013 23:07:27 +0300 |
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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.
Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Pekka Enberg <penberg@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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