[lttng-dev] Installing LTTNG on beaglebone black or rasberry pi
Jonathan Rajotte Julien
Jonathan.rajotte-julien at efficios.com
Fri Nov 18 00:38:43 UTC 2016
Hi,
On 2016-11-17 07:24 PM, Nwafor, Ebelechukwu wrote:
> 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.
Terminate both of them. Since you installed it from apt-get the
lttng-tools package provide a service for lttng-sessiond implying that
the lttng-sessiond process should get restarted automatically if killed.
Again, make sure that the user issuing the "lttng list -k" is part of
the "tracing" group or simply root.
If this still does not work refer to the last email and stop the service
then, as root, launch "lttng-sessiond -vvv" and check the output to make
sure that the modules gets loaded.
Open another terminal and test the kernel tracepoint listing.
If this does not work make sure to include the output from
"lttng-sessiond -vvv" in your next email.
Cheers
>
> On Thu, Nov 17, 2016 at 4:45 PM, Jonathan Rajotte Julien
> <Jonathan.rajotte-julien at efficios.com
> <mailto: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>
> <mailto: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>
> <mailto: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.
>
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>
>
>
> -- 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.
--
Jonathan R. Julien
Efficios
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