From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Thu, 11 Mar 2010 18:53:12 +0000 (-0300)
Subject: perf record: Mention paranoid sysctl when failing to create counter
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6230f2c7ef01a69e2ba9370326572c287209d32a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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");