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>
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@ -280,7 +280,8 @@ try_again:
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int err = errno;
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if (err == EPERM || err == EACCES)
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die("Permission error - are you root?\n");
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die("Permission error - are you root?\n"
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"\t Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n");
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else if (err == ENODEV && profile_cpu != -1)
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die("No such device - did you specify an out-of-range profile CPU?\n");
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