linux-kernel - [PATCH 2/2] perf record: Mention paranoid sysctl when failing to create counter

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Date:	Thu, 11 Mar 2010 15:53:12 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 2/2] perf record: Mention paranoid sysctl when failing to create counter

From: Arnaldo Carvalho de Melo <acme@...hat.com>

[acme@...a linux-2.6-tip]$ perf record -a -f
  Fatal: Permission error - are you root?
	 Consider tweaking /proc/sys/kernel/perf_event_paranoid.

[acme@...a linux-2.6-tip]$

Suggested-by: Ingo Molnar <mingo@...e.hu>
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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 3bf1409..b280ab5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -283,7 +283,8 @@ 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");
 
-- 
1.5.5.1

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