From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753379Ab3JVO2p (ORCPT ); Tue, 22 Oct 2013 10:28:45 -0400 Received: from merlin.infradead.org ([205.233.59.134]:53804 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751950Ab3JVO2o (ORCPT ); Tue, 22 Oct 2013 10:28:44 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Pekka Enberg , Arnaldo Carvalho de Melo Subject: [PATCH 19/26] perf list: Show error if tracepoints not available Date: Tue, 22 Oct 2013 11:28:27 -0300 Message-Id: <1382452114-1243-20-git-send-email-acme@infradead.org> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1382452114-1243-1-git-send-email-acme@infradead.org> References: <1382452114-1243-1-git-send-email-acme@infradead.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pekka Enberg 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 Acked-by: Ingo Molnar Cc: Ingo Molnar Link: http://lkml.kernel.org/r/1381867647-8594-1-git-send-email-penberg@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- 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 98125319b158..c90e55cf7e82 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) -- 1.8.1.4