[lttng-dev] lttng create --output problem

[Mathieu Desnoyers]

* David Goulet (dgoulet at efficios.com) wrote:
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> Did you installed lttng-modules ?
> 
> However, "Function not implemented" ... this sounds like the ioctl() syscall is
> not available in the kernel somehow... or not implemented in the libc
> you are using.

We'd need to output of lsmod (while sessiond is running) and kernel
configuration (.config).

Thanks,

Mathieu

> 
> David
> 
> On 12-04-03 04:38 PM, Ryan.Kyser at jci.com wrote:
> > 
> > Hi David,
> > 
> > That did it. I was avoiding using enable-events because of another error I was
> > seeing. Do you have any idea why the following error would be showing up?
> > 
> > /tmp # lttng -vvv enable-event -a -k
> > DEBUG2: Config file path found: / [in get_session_name() at utils.c:49]
> > DEBUG1: Session name found: new3 [in get_session_name() at utils.c:50]
> > PERROR: create event ioctl: Function not implemented [in kernel_create_event()
> > at kernel.c:200]
> > Error: Events: Enable kernel event failed (channel channel0, session new3)
> > DEBUG1: Clean exit [in clean_exit() at lttng.c:165]
> > 
> > Thank you,
> > Ryan Kyser
> > 
> > 
> > From: 	David Goulet <dgoulet at efficios.com>
> > To: 	Ryan.Kyser at jci.com
> > Cc: 	lttng-dev at lists.lttng.org
> > Date: 	04/03/2012 04:11 PM
> > Subject: 	Re: [lttng-dev] lttng create --output problem
> > 
> > 
> > 
> > 
> > 
> > Hi Ryan,
> > 
> > Well, the --output works on our test suites so it might be something you do that
> > does not create the trace.
> > 
> > Simply using create, start and stop will produce nothing. You have to at least
> > enable events for trace files to be created since they are opened by the consumer.
> > 
> > Can you try "lttng enable-events -a -k" (enabling all kernel events) after the
> > create session and tell me if it works for you? (or use user space tracing,
> > whatever works for you).
> > 
> > If not, add "-vvv" to the lttng command for debug output and also for the
> > session daemon.
> > 
> > # lttng-sessiond -vvv
> > # lttng -vvv ...
> > 
> > Thanks!
> > David
> > 
> > On 12-04-03 04:02 PM, Ryan.Kyser at jci.com wrote:
> > 
> >> Whenever I try using the --output flag for creating a new session, it doesn't
> >> seem to use the location specified. Additionally, if I do a find on the entire
> >> file system, no files are found that start with session name specified. This
> >> seems like a bug to me ... or am I doing something wrong?
> > 
> >> //---------------------------------------
> >> // Log
> >> //---------------------------------------
> > 
> >> / # lttng create --output /tmp new3
> >> Session new3 created.
> >> Traces will be written in /tmp
> >> / # lttng start
> >> Tracing started for session new3
> >> / # lttng stop
> >> Tracing stopped for session new3
> >> / # ls /tmp
> >> wayland-0       wayland-0.lock
> > 
> > 
> >> Thank you,
> >> Ryan Kyser
> > 
> > 
> > 
> >> _______________________________________________
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> >> lttng-dev at lists.lttng.org
> >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> > <http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>
> 
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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com