From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
David Ahern <dsahern@gmail.com>, Don Zickus <dzickus@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Jiri Olsa <jolsa@redhat.com>, Mike Galbraith <efault@gmx.de>,
Namhyung Kim <namhyung@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>
Subject: [PATCH 02/11] perf evlist: Add suggestion of how to set perf_event_paranoid sysctl
Date: Thu, 19 Jun 2014 18:13:44 -0300 [thread overview]
Message-ID: <1403212433-2714-3-git-send-email-acme@kernel.org> (raw)
In-Reply-To: <1403212433-2714-1-git-send-email-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Minor hint to speed up problem resolution and get 'trace' working for
non root users.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-abdqi8km4fj9osrn70q2zj9v@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
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 59ef2802fcf6..c51223ac25f4 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);
--
1.9.3
next prev parent reply other threads:[~2014-06-19 21:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-19 21:13 [GIT PULL 00/11] perf/core improvements and fixes Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 01/11] perf trace: Fix up fd -> pathname resolution Arnaldo Carvalho de Melo
2014-06-19 21:13 ` Arnaldo Carvalho de Melo [this message]
2014-06-19 21:13 ` [PATCH 03/11] perf trace: Remove needless reassignments Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 04/11] perf trace: Cache the is_exit syscall test Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 05/11] perf hists browser: Remove ev_name argument from perf_evsel__hists_browse Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 06/11] perf ui browser: Fix scrollbar refresh row index Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 07/11] perf bench sched-messaging: Plug memleak Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 08/11] perf bench: Add --repeat option Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 09/11] perf bench futex: Use global " Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 10/11] perf bench mem: The -o and -n options are mutually exclusive Arnaldo Carvalho de Melo
2014-06-19 21:13 ` [PATCH 11/11] perf bench sched-messaging: Drop barf() Arnaldo Carvalho de Melo
2014-06-25 5:43 ` [GIT PULL 00/11] perf/core improvements and fixes Ingo Molnar
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