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

[Mathieu Desnoyers]

please open a bug report on the bug tracker for this issue if you still
see it. Please let us know if you see it in 2.2-rc1 too.

* Matthew Khouzam (matthew.khouzam at ericsson.com) wrote:
> 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
> >
> >
> >
> 
> 
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com