[lttng-dev] Error using add-context for perf counters

[Matthew Khouzam]

Hi, I can confirm this bug, Has anyone else tried it?

On 13-03-19 03:03 PM, Bernd Hufmann wrote:
> Hello
>
> I cannot add contexts for perf counters using lttng-tools v2.1.1 and I
> get an error (see below). When using lttng-tools 2.0.5 (on a different
> computer) it works. Could somebody from lttng development team look
> into that?
>
> Thanks
> Bernd
>
> ----------------------------------------------------------------------
> > lttng create mySession
> Session mySession created.
> Traces will be written in
> /home/bernd/lttng-traces/mySession-20130319-145021
>
> > lttng enable-event -a -k
> All kernel events are enabled in channel channel0
>
> > lttng add-context -k -t perf:branch-misses -t perf:cache-misses
> PERROR: add context ioctl: Invalid argument [in
> kernel_add_channel_context() at kernel.c:47]
> Error: perf:cache-misses: Add kernel context failed
> PERROR: add context ioctl: Invalid argument [in
> kernel_add_channel_context() at kernel.c:47]
> Error: perf:branch-misses: Add kernel context failed
> Warning: Some command(s) went wrong
>
> -----------------------------------------------------------------------
> My setup is:
> Ubuntu 12.04 with kernel 3.2.0-38
> lttng-modules v2.1.1
> lttng-tools v2.1.1
>
>
>