From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755211AbaFYFvJ (ORCPT ); Wed, 25 Jun 2014 01:51:09 -0400 Received: from terminus.zytor.com ([198.137.202.10]:36257 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754664AbaFYFvF (ORCPT ); Wed, 25 Jun 2014 01:51:05 -0400 Date: Tue, 24 Jun 2014 22:50:23 -0700 From: tip-bot for Arnaldo Carvalho de Melo Message-ID: Cc: linux-kernel@vger.kernel.org, eranian@google.com, paulus@samba.org, acme@redhat.com, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org, efault@gmx.de, namhyung@kernel.org, jolsa@redhat.com, fweisbec@gmail.com, adrian.hunter@intel.com, dsahern@gmail.com, tglx@linutronix.de, dzickus@redhat.com Reply-To: mingo@kernel.org, hpa@zytor.com, acme@redhat.com, paulus@samba.org, eranian@google.com, linux-kernel@vger.kernel.org, efault@gmx.de, peterz@infradead.org, namhyung@kernel.org, jolsa@redhat.com, fweisbec@gmail.com, dsahern@gmail.com, adrian.hunter@intel.com, tglx@linutronix.de, dzickus@redhat.com To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf evlist: Add suggestion of how to set perf_event_paranoid sysctl Git-Commit-ID: 5229e366ee6baeb58b77e09643d2e11cbbd29950 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 5229e366ee6baeb58b77e09643d2e11cbbd29950 Gitweb: http://git.kernel.org/tip/5229e366ee6baeb58b77e09643d2e11cbbd29950 Author: Arnaldo Carvalho de Melo AuthorDate: Tue, 10 Jun 2014 17:18:54 -0300 Committer: Arnaldo Carvalho de Melo CommitDate: Thu, 19 Jun 2014 16:13:12 -0300 perf evlist: Add suggestion of how to set perf_event_paranoid sysctl Minor hint to speed up problem resolution and get 'trace' working for non root users. Cc: Adrian Hunter Cc: David Ahern Cc: Don Zickus Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-abdqi8km4fj9osrn70q2zj9v@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evlist.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 59ef280..c51223a 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1214,10 +1214,11 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, "For your workloads it needs to be <= 1\nHint:\t"); } printed += scnprintf(buf + printed, size - printed, - "For system wide tracing it needs to be set to -1"); + "For system wide tracing it needs to be set to -1.\n"); printed += scnprintf(buf + printed, size - printed, - ".\nHint:\tThe current value is %d.", value); + "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" + "Hint:\tThe current value is %d.", value); break; default: scnprintf(buf, size, "%s", emsg);