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
<[email protected]
<mailto:[email protected]>> 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@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@ebele-desktop:~#
On Thu, Nov 17, 2016 at 3:00 PM, Jonathan Rajotte
<[email protected]
<mailto:[email protected]>
<mailto:[email protected]
<mailto:[email protected]>>> 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
<[email protected]
<mailto:[email protected]>
<mailto:[email protected]
<mailto:[email protected]>>> 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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<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.
--
Jonathan R. Julien
Efficios
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