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

[Ingo Molnar]

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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