On Mon, Mar 21, 2011 at 6:52 AM, 陳韋任 <che...@iis.sinica.edu.tw> wrote:
> Hi,
>
>> Note that not all events support PEBS. This is PMU specific. The kernel
>> rejects any attempts to use PEBS on events which do not support it.
>
> $ perf stat -e branches:pp ls
> No permission to collect stats.
> Consider tweaking /proc/sys/kernel/perf_event_paranoid.
>
I doubt this problem is permission related. It may be that perf is
over-interpreting
the error code.

>  Does above mean event "branches" does not support PBES? Or something
> else?
>
I suspect so. Older version of perf add poor error messages.

Which machine is this running on?

>  Thanks!
>
> Regards,
> chenwj
>
> --
> Wei-Ren Chen (陳韋任)
> Parallel Processing Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
>
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