linux-kernel - [PATCH] perf list: Show error if tracepoints not available

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Message-Id: <1381867647-8594-1-git-send-email-penberg@kernel.org>
Date:	Tue, 15 Oct 2013 23:07:27 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Pekka Enberg <penberg@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] perf list: Show error if tracepoints not available

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@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Pekka Enberg <penberg@...nel.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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