linux-kernel - perf top -u <uid> does not seem to be working

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Message-ID: <20131112232249.GA31384@gmail.com>
Date:	Wed, 13 Nov 2013 00:22:49 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: perf top -u <uid> does not seem to be working


Hm, this is unexpected I think:

  hubble:~> perf top --stdio -u mingo
  Error:
  You may not have permission to collect stats.
  Consider tweaking /proc/sys/kernel/perf_event_paranoid:
   -1 - Not paranoid at all
    0 - Disallow raw tracepoint access for unpriv
    1 - Disallow cpu events for unpriv
    2 - Disallow kernel profiling for unpriv

  hubble:~> cat /proc/sys/kernel/perf_event_paranoid 
  -1

  hubble:~> perf top --stdio -u
     Error: switch `u' requires a value

   usage: perf top [<options>]

      -u, --uid <user>      user to profile

(perf is the latest version from tip:perf/core)

Thanks,

	Ingo
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