[lttng-dev] make a trace_event in a modul (driver)

[Klaus Dannecker]

Am 24.11.2013 17:01, schrieb Jérémie Galarneau:
> On Sun, Nov 24, 2013 at 6:43 AM, Klaus Dannecker <klaus.dannecker at gmx.de> wrote:
>> Am 22.11.2013 19:54, schrieb Thibault, Daniel:
>>
>>>> how can I define a "tracing"group , so I no longer need the sudo command?
>>> $ sudo addgroup --system tracing
>>> $ sudo adduser username tracing
>>>
>>> You must log off and back on for group membership to be activated.
>>>
>>> You may also want to add lttng-sessiond as a service:
>>>
>>> $ sudo ln --symbolic /lib/init/upstart-job /etc/init.d/lttng-sessiond
>>>
>>> And create /etc/init/lttng-sessiond.conf containing:
>>>
>>> description "LTTng central tracing registry session daemon"
>>> author "Stéphane Graber <stgraber at ubuntu.com>"
>>> start on local-filesystems
>>> stop on runlevel [06]
>>> respawn
>>> exec lttng-sessiond
>>>
>>> You can then start the session daemon with 'sudo service lttng-sessiond
>>> start' (stop it with 'stop', restart with 'restart').
>> Thanks, now it works
>> but when i
>> $ lttng create
>> $ lttng enable-event -k -a
>> $ lttng start
>> so, the function does not return!
>> only 'strg c' terminated the fuktion.
>>
> Interesting. Would you mind running "lttng start" in verbose mode and
> provide the output?
> lttng -vvv start
klaus at ubuntu:~$ sudo lttng -vvv start
DEBUG2 [2854/2854]: Config file path found: /home/klaus (in 
get_session_name() at utils.c:57)
DEBUG1 [2854/2854]: Session name found: auto-20131124-091639 (in 
get_session_name() at utils.c:58)
DEBUG1 [2854/2854]: Starting tracing for session auto-20131124-091639 
(in start_tracing() at commands/start.c:81)
DEBUG1 [2854/2854]: LSM cmd type : 16 (in send_session_msg() at 
lttng-ctl.c:131)
'ctrl c'
klaus at ubuntu:~$

>> the same by
>> $ lttng stop
>> and
>> $ lttng destroy
>>
>> but
>> $ lttng create
>> $ lttng enable-event -u -a
>> $ lttng start
>> $ lttng stop
>> $ lttng destroy
>> -> works
>>
>> how can i remove all installed lttng_modules,
>> so that I can start again from the beginning?
>>
> lttng-modules does not define an "uninstall" make target. I guess
> you'll have to delete the modules manually under
> /lib/modules/$(uname -r)/extra
> /lib/modules/$(uname -r)/extra/lib
> /lib/modules/$(uname -r)/extra/probes
>
> I'm wondering if it could be a conflict with your distribution's
> lttng-modules-dkms package... Could you verify that it is not
> installed?
now i make two experiments:
first:
install ubuntu 12.04 in vmware
$ git clone git://git.lttng.org/lttng-tools.git
$ git clone git://git.lttng.org/lttng-modules.git
$ git clone git://git.lttng.org/lttng-ust.git
$ git clone git://git.lttng.org/userspace-rcu.git
compile and install all like:
https://www.ibm.com/developerworks/community/blogs/fe313521-2e95-46f2-817d-44a4f27eba32/entry/howto_tracing_with_lttng?lang=en
now i have the same problem.

second:
install ubuntu 12.04 in vmware
sudo apt-get install lttng-tools
...
Building only for 3.8.0-29-generic
Building initial module for 3.8.0-29-generic
Error! Bad return status for module build on kernel: 3.8.0-29-generic (i686)
Consult /var/lib/dkms/lttng-modules/2.0.2/build/make.log for more 
information.
Setting up lttng-tools (2.0.1-0ubuntu1) ...
/usr/sbin/addgroup
lttng-sessiond start/running, process 5515
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
klaus at ubuntu:~$

$ git clone git://git.lttng.org/lttng-modules.git
compile and install lttng_moules

now works lttng start, stop and destroy!

Klaus
>> Thanks
>> Klaus
>> sorry, i am a linux beginner
> No problem, we all were at some point :)
>
> Jérémie
>
>>
>>> Daniel U. Thibault
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>>
>>
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