[lttng-dev] lttng create --output problem

[David Goulet]

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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.

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 mailing list
>> lttng-dev at lists.lttng.org
>> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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