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

Jérémie Galarneau jeremie.galarneau at efficios.com
Fri Nov 22 14:06:27 EST 2013 

On Fri, Nov 22, 2013 at 12:33 PM, Klaus Dannecker
<klaus.dannecker at gmx.de> wrote:
> Hi.
>
> Thank's Jérémie!
>
> my account type is Administrator.
> sudo lttng list -k works good!
> how can I define a "tracing"group , so I no longer need the sudo command?
>
> another problem:
> i have add mycustomevents in the lttng_module like
> http://lists.lttng.org/pipermail/lttng-dev/2013-October/021540.html
> but after
>
> $ make
> $ sudo make modules_install
> $ sudo depmod -a
>  and
> $ sudo lttng list -k
> my lttng-probe-mycustomevents.ko is now in
> /lib/modules/3.11.0-12-generic/extra/probes
> but i can't find my new event in the list!

This thread may help you out for this point.

http://lists.lttng.org/pipermail/lttng-dev/2013-October/021543.html

>
> Regards,
> Klaus
>
>
> Am 22.11.2013 17:12, schrieb Jérémie Galarneau:
>
>> On Fri, Nov 22, 2013 at 5:54 AM, Klaus Dannecker <klaus.dannecker at gmx.de>
>> wrote:
>>>
>>> Am 21.11.2013 18:41, schrieb 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
>>>
>>> klaus at ubuntu:~$ sudo lttng-sessiond -vvv
>>> [sudo] password for klaus:
>>> DEBUG3 [23710/23710]: Creating LTTng run directory: /var/run/lttng (in
>>> create_lttng_rundir() at main.c:4267)
>>> DEBUG2 [23710/23710]: Kernel consumer err path:
>>> /var/run/lttng/kconsumerd/error (in main() at main.c:4696)
>>> DEBUG2 [23710/23710]: Kernel consumer cmd path:
>>> /var/run/lttng/kconsumerd/command (in main() at main.c:4698)
>>> DEBUG1 [23710/23710]: Client socket path
>>> /var/run/lttng/client-lttng-sessiond (in main() at main.c:4751)
>>> DEBUG1 [23710/23710]: Application socket path
>>> /var/run/lttng/lttng-ust-sock-5 (in main() at main.c:4752)
>>> DEBUG1 [23710/23710]: Application wait path /lttng-ust-wait-5 (in main()
>>> at
>>> main.c:4753)
>>> DEBUG1 [23710/23710]: LTTng run directory path: /var/run/lttng (in main()
>>> at
>>> main.c:4754)
>>> DEBUG2 [23710/23710]: UST consumer 32 bits err path:
>>> /var/run/lttng/ustconsumerd32/error (in main() at main.c:4763)
>>> DEBUG2 [23710/23710]: UST consumer 32 bits cmd path:
>>> /var/run/lttng/ustconsumerd32/command (in main() at main.c:4765)
>>> DEBUG2 [23710/23710]: UST consumer 64 bits err path:
>>> /var/run/lttng/ustconsumerd64/error (in main() at main.c:4774)
>>> DEBUG2 [23710/23710]: UST consumer 64 bits cmd path:
>>> /var/run/lttng/ustconsumerd64/command (in main() at main.c:4776)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982c080 of type 1 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982c270 of type 1 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982c498 of type 1 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982c6c0 of type 1 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG2 [23710/23710]: Creating consumer directory:
>>> /var/run/lttng/kconsumerd
>>> (in set_consumer_sockets() at main.c:4309)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-tracer (in
>>> modprobe_lttng_control() at modprobe.c:192)
>>> DEBUG2 [23710/23710]: Kernel tracer version validated (major version 2)
>>> (in
>>> kernel_validate_version() at kernel.c:700)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-ftrace (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-kprobes (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-kretprobes (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-lib-ring-buffer (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-client-discard
>>> (in modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-client-overwrite (in modprobe_lttng_data() at
>>> modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-metadata-client (in modprobe_lttng_data() at
>>> modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-client-mmap-discard (in modprobe_lttng_data() at
>>> modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-client-mmap-overwrite (in modprobe_lttng_data() at
>>> modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully
>>> lttng-ring-buffer-metadata-mmap-client (in modprobe_lttng_data() at
>>> modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-types (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-asoc (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-block (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-btrfs (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-compaction (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-ext3 (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-ext4 (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-gpio (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-irq (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-jbd (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-jbd2 (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-kmem (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-kvm (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-kvm-x86 (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-kvm-x86-mmu (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-lock (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-module (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-napi (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-net (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-power (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-printk (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-random (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-rcu (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-regmap (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-regulator (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-rpm (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-sched (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-scsi (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-signal (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-skb (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-sock (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-statedump (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-sunrpc (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-timer (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-udp (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-vmscan (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-workqueue (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Modprobe successfully lttng-probe-writeback (in
>>> modprobe_lttng_data() at modprobe.c:228)
>>> DEBUG1 [23710/23710]: Kernel tracer fd 6 (in init_kernel_tracer() at
>>> main.c:2364)
>>> DEBUG2 [23710/23710]: Creating consumer directory:
>>> /var/run/lttng/ustconsumerd64 (in set_consumer_sockets() at main.c:4309)
>>> DEBUG2 [23710/23710]: Creating consumer directory:
>>> /var/run/lttng/ustconsumerd32 (in set_consumer_sockets() at main.c:4309)
>>> DEBUG3 [23710/23710]: Session daemon client socket 9 and application
>>> socket
>>> 10 created (in init_daemon_socket() at main.c:4175)
>>> DEBUG1 [23710/23710]: All permissions are set (in set_permissions() at
>>> main.c:4255)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982e160 of type 2 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG3 [23710/23710]: Global buffer per UID registry initialized (in
>>> buffer_reg_init_uid_registry() at buffer-registry.c:99)
>>> DEBUG3 [23710/23710]: Created hashtable size 4 at 0x982e388 of type 2 (in
>>> lttng_ht_new() at hashtable.c:127)
>>> DEBUG3 [23710/23710]: Global buffer per PID registry initialized (in
>>> buffer_reg_init_pid_registry() at buffer-registry.c:220)
>>> DEBUG1 [23710/23710]: epoll set max size is 327338 (in
>>> compat_epoll_set_max_size() at compat-epoll.c:280)
>>> DEBUG1 [23710/23710]: Command subsystem initialized (in cmd_init() at
>>> cmd.c:3056)
>>> DEBUG1 [23710/23710]: Pid 23710 written in file
>>> /var/run/lttng/lttng-sessiond.pid (in utils_create_pid_file() at
>>> utils.c:437)
>>> DEBUG1 [23710/23710]: Pid 5345 written in file /var/run/lttng/jul.port
>>> (in
>>> utils_create_pid_file() at utils.c:437)
>>> DEBUG1 [23710/23710]: TCP inet operation timeout set to 216 sec (in
>>> lttcomm_inet_init() at inet.c:529)
>>> DEBUG1 [23710/23710]: Health check time delta in seconds set to 236 (in
>>> health_init() at health.c:73)
>>> DEBUG1 [23710/23820]: [thread] Manage health check started (in
>>> thread_manage_health() at main.c:3511)
>>> DEBUG1 [23710/23824]: [thread] Manage application started (in
>>> thread_manage_apps() at main.c:1256)
>>> DEBUG1 [23710/23823]: [thread] Manage application registration started
>>> (in
>>> thread_registration_apps() at main.c:1766)
>>> DEBUG1 [23710/23822]: [thread] Dispatch UST command started (in
>>> thread_dispatch_ust_registration() at main.c:1543)
>>> DEBUG1 [23710/23821]: [thread] Manage client started (in
>>> thread_manage_clients() at main.c:3695)
>>> DEBUG1 [23710/23821]: Accepting client command ... (in
>>> thread_manage_clients() at main.c:3747)
>>> DEBUG1 [23710/23819]: [ht-thread] startup. (in thread_ht_cleanup() at
>>> ht-cleanup.c:35)
>>> DEBUG3 [23710/23819]: [ht-thread] Polling on 2 fds. (in
>>> thread_ht_cleanup()
>>> at ht-cleanup.c:59)
>>> DEBUG1 [23710/23825]: [ust-thread] Manage application notify command (in
>>> ust_thread_manage_notify() at ust-thread.c:38)
>>> DEBUG1 [23710/23826]: [jul-thread] Manage JUL application registration.
>>> (in
>>> jul_thread_manage_registration() at jul-thread.c:250)
>>> DEBUG3 [23710/23826]: URI string: tcp://localhost (in uri_parse() at
>>> uri.c:291)
>>> DEBUG1 [23710/23824]: Apps thread polling on 2 fds (in
>>> thread_manage_apps()
>>> at main.c:1286)
>>> DEBUG1 [23710/23822]: Futex n to 1 prepare done (in futex_nto1_prepare()
>>> at
>>> futex.c:75)
>>> DEBUG1 [23710/23823]: Notifying applications of session daemon state: 1
>>> (in
>>> notify_ust_apps() at main.c:593)
>>> DEBUG3 [23710/23825]: [ust-thread] Manage notify polling on 2 fds (in
>>> ust_thread_manage_notify() at ust-thread.c:63)
>>> DEBUG1 [23710/23820]: Health check ready (in thread_manage_health() at
>>> main.c:3574)
>>> DEBUG1 [23710/23827]: [thread] Thread manage kernel started (in
>>> thread_manage_kernel() at main.c:794)
>>> DEBUG1 [23710/23827]: Updating kernel poll set (in update_kernel_poll()
>>> at
>>> main.c:654)
>>> DEBUG1 [23710/23827]: Thread kernel polling on 2 fds (in
>>> thread_manage_kernel() at main.c:839)
>>> DEBUG1 [23710/23822]: Woken up but nothing in the UST command queue (in
>>> thread_dispatch_ust_registration() at main.c:1566)
>>> DEBUG2 [23710/23826]: IP address resolved to 127.0.0.1 (in
>>> set_ip_address()
>>> at uri.c:132)
>>> DEBUG3 [23710/23826]: URI dtype: 1, proto: 1, host: localhost, subdir: ,
>>> ctrl: 0, data: 0 (in uri_parse() at uri.c:505)
>>> PERROR [23710/23826]: bind inet: Address already in use (in
>>> lttcomm_bind_inet_sock() at inet.c:109)
>>> DEBUG1 [23710/23826]: [jul-thread] is cleaning up and stopping. (in
>>> jul_thread_manage_registration() at jul-thread.c:356)
>>> DEBUG3 [23710/23826]: [jul-thread] Cleaning JUL apps ht (in
>>> clean_jul_apps_ht() at jul-thread.c:100)
>>> DEBUG1 [23710/23823]: Got the wait shm fd 26 (in get_wait_shm() at
>>> shm.c:115)
>>> DEBUG1 [23710/23823]: Futex wait update active 1 (in futex_wait_update()
>>> at
>>> futex.c:63)
>>> DEBUG1 [23710/23823]: Accepting application registration (in
>>> thread_registration_apps() at main.c:1803)
>>>
>>> another terminal:
>>>
>>> klaus at ubuntu:~/lttng_src/lttng-modules$ lsmod | grep lttng
>>> lttng_probe_writeback    22927  0
>>> lttng_probe_workqueue    13726  0
>>> lttng_probe_vmscan     17138  0
>>> ....
>>>
>>> but:
>>> klaus at ubuntu:~/lttng_src/lttng-modules$ lttng list -k
>>> Error: Unable to list kernel events: Tracing the kernel requires a root
>>> lttng-sessiond daemon, as well as "tracing" group membership or root user
>>> ID
>>> for the lttng client.
>>> Error: Command error
>>> klaus at ubuntu:~/lttng_src/lttng-modules$
>>>
>>> then stop the command sudo lttng-sessiond -vvv with "STRG+C"
>>> ^CDEBUG1 [23710/23710]: SIGINT caught (in sighandler() at main.c:4374)
>>> DEBUG1 [23710/23710]: Terminating all threads (in stop_threads() at
>>> main.c:370)
>>> DEBUG1 [23710/23710]: Futex n to 1 wake done (in futex_nto1_wake() at
>>> futex.c:104)
>>> DEBUG1 [23710/23821]: Clean command context structure (in
>>> clean_command_ctx() at main.c:573)
>>> ...
>>>
>>> klaus at ubuntu:~/lttng_src/lttng-modules$ lsmod | grep lttng
>>> klaus at ubuntu:~/lttng_src/lttng-modules$
>>>
>> Everything looks fine to me.
>>
>> The modules are loaded and unloaded automatically by the session
>> daemon when it is launched and stopped, respectively.
>>
>> If you want to trace the kernel or list the kernel events, you will
>> have to launch a root session daemon (sudo lttng-sessiond -d) and then
>> create a tracing session either as root or as a member of the
>> "tracing" group.
>>
>> Regards,
>> Jérémie
>>
>>> Regards,
>>> Klaus
>>>
>>>
>>>
>>>
>>>> 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

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