[lttng-dev] Installing LTTNG on beaglebone black or rasberry pi

Fri Nov 18 00:24:45 UTC 2016

Thanks Jonathan for you helpful response. I was able to install the
specific linux-headers and it seems to install all of the modules. Now i've
hit another roadblock. whenever i try to list all of the kernel events
using lttng list -k, it throws an error: unable to list kernel events:
Kernel tracer is not available. I have two lttng-sessiond running.

On Thu, Nov 17, 2016 at 4:45 PM, Jonathan Rajotte Julien <
Jonathan.rajotte-julien at efficios.com> wrote:

> Hi,
>
>
> On 2016-11-17 04:24 PM, Nwafor, Ebelechukwu wrote:
>
>> Hi Jonathan. Thank you for your response.
>>
>> On the beaglebone black, i tried building lttng-tools, lttng-modules-dkms
>> and lttng-ust-dev from source v2.8.1 by following the documentation.
>> lttng-modules-dkms runs fine but the module does not show up on the list of
>> running modules when i issue an lsmod command. Also, i run into errors
>> while trying to build and compile lttng-tools. Beaglebone black runs on
>> debian. Linux beaglebone 3.8.13-bone70 #1 SMP Fri Jan 23 02:15:42 UTC 2015
>> armv7l GNU/Linux
>>
>
> What errors do you see when building lttng-tools?
>
>
>>
>> On the raspberry pi, I use the commands, apt-get install
>> lttng-modules-dkms lttng-tools lttng-ust-dev. Everything seems to work fine
>> with the exception of lttng-modules-dkms which does not show up on the list
>> on running modules. Also, every time i try to view available kernel events,
>> it comes up with an error saying unable to list kernel events: kernel
>> tracer not available. The LTTNG version installed using apt-get is 2.7.1. I
>> am running ubuntu mate OS. Below are the output while installing
>> lttng-modules-dkms
>>
>
> Well as the error points out do you have the kernel tracer started?
>
> ps -aux | grep lttng-sessiond
>
> Does the user trying to use lttng is part of the tracing group or is root ?
>
> You can start lttng-sessiond with the -vvv options make sure to be root
> when doing so lttng-sessiond load the tracing modules.
>
> Since you installed it from apt-get the lttng-tools package provide a
> daemon for lttng-sessiond so before testing manually:
>
> service lttng-sessiond stop
>
>
>>
>> root at ebele-desktop:~# apt-get install lttng-modules-dkms
>> Reading package lists... Done
>> Building dependency tree
>> Reading state information... Done
>> lttng-modules-dkms is already the newest version (2.7.1-1).
>> 0 upgraded, 0 newly installed, 0 to remove and 14 not upgraded.
>> 2 not fully installed or removed.
>> After this operation, 0 B of additional disk space will be used.
>> Do you want to continue? [Y/n] Y
>> Setting up linux-headers-4.4.0-22 (4.4.0-22.40) ...
>> Setting up lttng-modules-dkms (2.7.1-1) ...
>> Loading new lttng-modules-2.7.1 DKMS files...
>> First Installation: checking all kernels...
>> dpkg: warning: version '*-*' has bad syntax: version number does not
>> start with digit
>> It is likely that 4.4.30-v7+ belongs to a chroot's host
>> Module build for the currently running kernel was skipped since the
>> kernel source for this kernel does not seem to be installed.
>>
>
>
> Could you make sure that your linux header for the running kernel are
> installed.
>
> 4.4.30-v7+ seems like a custom kernel install.
>
> root at ebele-desktop:~#
>>
>>
>>
>> On Thu, Nov 17, 2016 at 3:00 PM, Jonathan Rajotte <
>> jonathan.r.julien at gmail.com <mailto:jonathan.r.julien at gmail.com>> wrote:
>>
>>     Hi,
>>
>>     Could you be a bit more precise regarding which part of the
>>     documentation does not work ?
>>
>>     How did you install it ? Distribution packages ? From sources ?
>>     Cross compiled ?
>>
>>     What is your setup ? Raspian for the Pi ? Custom kernel image ?
>>
>>     Cheers
>>
>>     On Thu, Nov 17, 2016 at 2:54 PM, Nwafor, Ebelechukwu
>>     <ebelechukwu.nwafor at bison.howard.edu
>>     <mailto:ebelechukwu.nwafor at bison.howard.edu>> wrote:
>>
>>         Hello.
>>
>>         I am trying to install LTTNG tracing tool on raspberry pi and
>>         beaglebone black board.The official LTTNG documentation does
>>         not work on these devices. Does anyone know of any tutorial
>>         that can help me accomplish this? Thanks.
>>
>>         --         Ebelechukwu Nwafor,
>>         Graduate Student,
>>         Howard University.
>>
>>         _______________________________________________
>>         lttng-dev mailing list
>>         lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
>>         https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>         <https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>
>>
>>
>>
>>
>>     --     Jonathan Rajotte Julien
>>
>>
>>
>>
>> --
>> Ebelechukwu Nwafor,
>> Graduate Student,
>> Howard University.
>>
>>
>> _______________________________________________
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>>
>
> --
> Jonathan R. Julien
> Efficios
>
>
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>

-- 
Ebelechukwu Nwafor,
Graduate Student,
Howard University.
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