diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-03-11 15:53:12 -0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-11 20:00:48 +0100 |
| commit | 6230f2c7ef01a69e2ba9370326572c287209d32a (patch) | |
| tree | ec8c42151dd9a7d280c220d5a0752b2aabf7d538 /tools | |
| parent | 9b33fa6ba0e2f90fdf407501db801c2511121564 (diff) | |
perf record: Mention paranoid sysctl when failing to create counter
[acme@mica linux-2.6-tip]$ perf record -a -f
Fatal: Permission error - are you root?
Consider tweaking /proc/sys/kernel/perf_event_paranoid.
[acme@mica linux-2.6-tip]$
Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1268333592-30872-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-record.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 771533ced6a8..6e4a39328b33 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -280,7 +280,8 @@ try_again: int err = errno; if (err == EPERM || err == EACCES) - die("Permission error - are you root?\n"); + die("Permission error - are you root?\n" + "\t Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n"); else if (err == ENODEV && profile_cpu != -1) die("No such device - did you specify an out-of-range profile CPU?\n"); |