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

[Jérémie Galarneau]

On Thu, Nov 21, 2013 at 11:42 AM, Klaus Dannecker
<klaus.dannecker at gmx.de> wrote:
>
> Am 21.11.2013 16:49, schrieb Jérémie Galarneau:
>
>> On Thu, Nov 21, 2013 at 4:48 AM, Klaus Dannecker <klaus.dannecker at gmx.de>
>> wrote:
>>>
>>> Hi,
>>>
>>> Nobody can help me?
>>>
>>> now i have ubuntu 13.10 installed  in a vmware.
>>> but i have the same error!
>>>
>>> s$ sudo make modules_install
>>> make -C /lib/modules/3.11.0-12-generic/build
>>> M=/home/klaus/lttng_src/lttng-modules modules_install
>>> make[1]: Entering directory `/usr/src/linux-headers-3.11.0-12-generic'
>>>    INSTALL
>>> /home/klaus/lttng_src/lttng-modules/lib/lttng-lib-ring-buffer.ko
>>>
>>> Can't read private key
>>
>> Ubuntu now ships with module signing enabled by default.
>> Does the installation fail, or is it just a warning?
>
> i don't know
>
>>> ....
>>> lsmod | grep lttng
>>> -> no module found
>>>
>> The modules will not be automatically loaded after being built and
>> installed. You have to launch lttng-sessiond (as root) for that. What
>> is the output of the following commands?
>>
>> make
>> sudo make modules_install
>> sudo depmod -a
>> sudo lttng-sessiond &
>> lsmod | grep lttng
>
> klaus at ubuntu:~/lttng_src/lttng-modules$ make
> make -C /lib/modules/3.11.0-12-generic/build
> M=/home/klaus/lttng_src/lttng-modules modules
>
> make[1]: Entering directory `/usr/src/linux-headers-3.11.0-12-generic'
> /home/klaus/lttng_src/lttng-modules/probes/Makefile:30: File
> /usr/src/linux-headers-3.11.0-12-generic/virt/kvm/iodev.h not found. Probe
> "kvm" x86-specific is disabled. Use full kernel source tree to enable it.
> /home/klaus/lttng_src/lttng-modules/probes/Makefile:81: Files
> /usr/src/linux-headers-3.11.0-12-generic/fs/ext3/*.h not found. Probe "ext3"
> is disabled. Use full kernel source tree to enable it.
> /home/klaus/lttng_src/lttng-modules/probes/Makefile:142: Files
> /usr/src/linux-headers-3.11.0-12-generic/fs/btrfs/*.h not found. Probe
> "btrfs" is disabled. Use full kernel source tree to enable it.
> /home/klaus/lttng_src/lttng-modules/probes/Makefile:158: Files
> /usr/src/linux-headers-3.11.0-12-generic/fs/ext4/*.h not found. Probe "ext4"
> is disabled. Use full kernel source tree to enable it.
>   Building modules, stage 2.
>   MODPOST 44 modules
> make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-12-generic'
>
> klaus at ubuntu:~/lttng_src/lttng-modules$ sudo make modules_install
>
> make -C /lib/modules/3.11.0-12-generic/build
> M=/home/klaus/lttng_src/lttng-modules modules_install
> make[1]: Entering directory `/usr/src/linux-headers-3.11.0-12-generic'
>   INSTALL /home/klaus/lttng_src/lttng-modules/lib/lttng-lib-ring-buffer.ko
> Can't read private key
>   INSTALL
> /home/klaus/lttng_src/lttng-modules/lttng-ring-buffer-client-discard.ko
>
> Can't read private key
> ...
>   DEPMOD  3.11.0-12-generic
> make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-12-generic'
> klaus at ubuntu:~/lttng_src/lttng-modules$
>
> klaus at ubuntu:~/lttng_src/lttng-modules$ sudo depmod -a
> klaus at ubuntu:~/lttng_src/lttng-modules$
> klaus at ubuntu:~/lttng_src/lttng-modules$ sudo lttng-sessiond &
> [1] 23486
> klaus at ubuntu:~/lttng_src/lttng-modules$ lsmod | grep lttng
>
> [1]+  Stopped                 sudo lttng-sessiond
> klaus at ubuntu:~/lttng_src/lttng-modules$
>

Hard to say why lttng-sessiond received SIGSTOP...

Could you try running the session daemon in verbose mode in another terminal?
sudo lttng-sessiond -vvv

This should load the modules or at least log an error if it fails to do so.

> Thanks for your help!
>
> Regards,
> Klaus
>
>> Regards,
>> Jérémie
>>
>>> Thanks!
>>>
>>> Am 13.11.2013 18:37, schrieb Klaus Dannecker:
>>>
>>>
>>> Am 09.11.2013 09:33, schrieb Klaus Dannecker:
>>>
>>> Hi,
>>> I want to write a driver with trace events.
>>> In the first step i compile the example  trace-events-sample.c with the
>>> makefile:
>>>
>>> ifneq ($(KERNELRELEASE),)
>>>      obj-m  := modul_trace-events-sample.o
>>>      modul_trace-events-sample-y := trace-events-sample.o
>>>      ccflags-y := -I$(src)
>>> else
>>>      KDIR ?= /lib/modules/`uname -r`/build
>>> default:
>>>      $(MAKE) -C $(KDIR) M=$$PWD
>>> endif
>>>
>>> now i get the modul_trace-events-sample.ko File.
>>> now:
>>> insmod modul_trace-events-sample.ko
>>> lttng create
>>> lttng enable-event -k -a
>>> lttng start
>>> ...wait...
>>> lttng stop
>>> lttng destroy
>>>
>>> now i look the result in the eclise viewer, but i found event
>>> "trace_foo_bar" not in the session!
>>> what am I doing wrong?
>>>
>>> I use ubuntu 13.04 in a vmware
>>>
>>> Thanks
>>>
>>> _______________________________________________
>>>
>>> Hi,
>>>
>>> now i found a answer:
>>> http://lists.lttng.org/pipermail/lttng-dev/2013-October/021540.html
>>> now i download the lttng-module and compiled it.
>>>
>>> $ git clone git://git.lttng.org/lttng-modules.git
>>> $ cd lttng-tools
>>> $ make
>>> $ sudo make modules_install
>>> here I get error
>>> INSTALL
>>> /mnt/hgfs/shared_Folder/lttng-modules/lib/lttng-lib-ring-buffer.ko
>>> Can't read private key
>>> ...
>>> what does that mean?
>>> what should I do?
>>>
>>> please help me!
>>>
>>> another question:
>>> when i create a trace events in module_a,
>>> can i use it in module_b?
>>> if yes, what should I do?
>>>
>>> thanks Klaus
>>>
>>>
>>> _______________________________________________
>>> lttng-dev mailing list
>>> lttng-dev at lists.lttng.org
>>> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>>
>>>
>>>
>>> _______________________________________________
>>> lttng-dev mailing list
>>> lttng-dev at lists.lttng.org
>>> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>>
>>
>>
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com