[lttng-dev] lttng trace kernel on arm64

Mon Apr 11 14:14:16 UTC 2016

Hi,

On 2016-04-08 02:28 AM, Lichuanbao wrote:
>
> Hi,
>
>    I want to use lttng trace kernel event,I installed lttng-tools 
> 2.7.1 lttng-ust 2.7.2 lttng-modules 2.7.2 on my arm64 board,
>

You got me curious: D02 ? D03 hisilicon board ? :)

> And then I create my session like sub command as root,but there is 
> nothing result to view.
>
>     # lttng create
>
>     # lttng enable-event --kernel --all
>
>     # lttng start
>
>     # sleep 10       # let the system generate some activity
>
>     # lttng stop
>
>     # lttng view
>
> # lttng destroy
>

Does "lttng list -k" return a list of events ?

> -bash-4.3# lttng view
>
> Trace directory: /root/lttng-traces/auto-20160407-211248
>
> [error] Cannot open any trace for reading.
>
> [error] opening trace "/root/lttng-traces/auto-20160407-211248" for 
> reading.
>
> [error] none of the specified trace paths could be opened.
>
> Get thes session daemon log as follow:
>
> bash-4.3# lttng-sessiond -vvv
>
> DEBUG1 - 21:52:15.396991 [5621/5621]: run_as signal handler set for 
> SIGTERM and SIGINT (in set_worker_sighandlers() at runas.c:600)
>
> DEBUG1 - 21:52:15.397410 [5620/5620]: Health check time delta in 
> seconds set to 20 (in health_init() at health.c:74)
>
> DEBUG1 - 21:52:15.397661 [5620/5620]: epoll set max size is 27037798 
> (in compat_epoll_set_max_size() at compat-epoll.c:290)
>
> DEBUG3 - 21:52:15.397838 [5620/5620]: Creating LTTng run directory: 
> /var/run/lttng (in create_lttng_rundir() at main.c:5156)
>
> DEBUG1 - 21:52:15.397852 [5620/5622]: [ht-thread] startup. (in 
> thread_ht_cleanup() at ht-cleanup.c:37)
>
> DEBUG2 - 21:52:15.397986 [5620/5620]: Kernel consumer err path: 
> /var/run/lttng/kconsumerd/error (in main() at main.c:5601)
>
> DEBUG2 - 21:52:15.398070 [5620/5620]: Kernel consumer cmd path: 
> /var/run/lttng/kconsumerd/command (in main() at main.c:5603)
>
> DEBUG3 - 21:52:15.398034 [5620/5622]: [ht-thread] Polling. (in 
> thread_ht_cleanup() at ht-cleanup.c:67)
>
> Error: Could not get lock file /var/run/lttng/lttng-sessiond.lck, 
> another instance is running.
>

This line suggest that another instance was running.

Make sure to kill all lttng-sessiond instance before starting one to 
make sure you have the actual log of the used sessiond.

Cheers

> DEBUG1 - 21:52:15.398240 [5620/5620]: Cleanup sessiond (in 
> sessiond_cleanup() at main.c:622)
>
> DEBUG1 - 21:52:15.398294 [5620/5620]: Removing sessiond and consumerd 
> content of directory /var/run/lttng (in sessiond_cleanup() at main.c:641)
>
> DEBUG1 - 21:52:15.398321 [5620/5620]: Removing 
> /var/run/lttng/lttng-sessiond.pid (in sessiond_cleanup() at main.c:647)
>
> DEBUG1 - 21:52:15.398372 [5620/5620]: Removing 
> /var/run/lttng/agent.port (in sessiond_cleanup() at main.c:652)
>
> DEBUG1 - 21:52:15.398420 [5620/5620]: Removing 
> /var/run/lttng/kconsumerd/error (in sessiond_cleanup() at main.c:659)
>
> DEBUG1 - 21:52:15.398472 [5620/5620]: Removing directory 
> /var/run/lttng/kconsumerd (in sessiond_cleanup() at main.c:665)
>
> DEBUG1 - 21:52:15.398526 [5620/5620]: Removing 
> /var/run/lttng/ustconsumerd32/error (in sessiond_cleanup() at main.c:672)
>
> DEBUG1 - 21:52:15.398579 [5620/5620]: Removing directory 
> /var/run/lttng/ustconsumerd32 (in sessiond_cleanup() at main.c:678)
>
> DEBUG1 - 21:52:15.398620 [5620/5620]: Removing 
> /var/run/lttng/ustconsumerd64/error (in sessiond_cleanup() at main.c:685)
>
> DEBUG1 - 21:52:15.398673 [5620/5620]: Removing directory 
> /var/run/lttng/ustconsumerd64 (in sessiond_cleanup() at main.c:691)
>
> DEBUG1 - 21:52:15.398734 [5620/5620]: Cleaning up all sessions (in 
> sessiond_cleanup() at main.c:694)
>
> DEBUG1 - 21:52:15.398765 [5620/5620]: Cleaning up all agent apps (in 
> sessiond_cleanup() at main.c:711)
>
> DEBUG1 - 21:52:15.398789 [5620/5620]: Closing all UST sockets (in 
> sessiond_cleanup() at main.c:714)
>
> DEBUG2 - 21:52:15.398813 [5620/5620]: UST app cleaning registered apps 
> hash table (in ust_app_clean_list() at ust-app.c:3702)
>
> DEBUG3 - 21:52:15.398837 [5620/5620]: Buffer registry destroy all 
> registry (in buffer_reg_destroy_registries() at buffer-registry.c:716)
>
> DEBUG2 - 21:52:15.398861 [5620/5620]: Closing kernel fd (in 
> sessiond_cleanup() at main.c:719)
>
> DEBUG1 - 21:52:15.398884 [5620/5620]: Unloading kernel modules (in 
> sessiond_cleanup() at main.c:726)
>
> DEBUG1 - 21:52:15.403580 [5620/5620]: Modprobe removal successful 
> lttng-kretprobes (in modprobe_remove_lttng() at modprobe.c:126)
>
> DEBUG1 - 21:52:15.407855 [5620/5620]: Modprobe removal successful 
> lttng-kprobes (in modprobe_remove_lttng() at modprobe.c:126)
>
> DEBUG1 - 21:52:15.412073 [5620/5620]: Modprobe removal successful 
> lttng-ftrace (in modprobe_remove_lttng() at modprobe.c:126)
>
> DEBUG1 - 21:52:15.416256 [5620/5620]: Modprobe removal successful 
> lttng-types (in modprobe_remove_lttng() at modprobe.c:126)
>
> DEBUG1 - 21:52:15.420593 [5620/5620]: Modprobe removal successful 
> lttng-ring-buffer-metadata-mmap-client (in modprobe_remove_lttng() at 
> modprobe.c:126)
>
> DEBUG1 - 21:52:15.425108 [5620/5620]: Modprobe removal successful 
> lttng-ring-buffer-client-mmap-overwrite (in modprobe_remove_lttng() at 
> modprobe.c:126)
>
> DEBUG1 - 21:52:15.429745 [5620/5620]: Modprobe removal successful 
> lttng-ring-buffer-client-mmap-discard (in modprobe_remove_lttng() at 
> modprobe.c:126)
>
> Error: Unable to remove module lttng-ring-buffer-metadata-client
>
> DEBUG1 - 21:52:15.438779 [5620/5620]: Modprobe removal successful 
> lttng-ring-buffer-client-overwrite (in modprobe_remove_lttng() at 
> modprobe.c:126)
>
> Error: Unable to remove module lttng-ring-buffer-client-discard
>
> Error: Unable to remove module lttng-lib-ring-buffer
>
> Error: Unable to remove module lttng-tracer
>
> DEBUG3 - 21:52:15.452135 [5620/5622]: [ht-thread] Returning from poll 
> on 2 fds. (in thread_ht_cleanup() at ht-cleanup.c:74)
>
> DEBUG1 - 21:52:15.452186 [5620/5622]: [ht-cleanup] quit. (in 
> thread_ht_cleanup() at ht-cleanup.c:153)
>
> DEBUG1 - 21:52:15.452225 [5620/5622]: [ht-cleanup] Thread terminates. 
> (in thread_ht_cleanup() at ht-cleanup.c:164)
>
> DEBUG1 - 21:52:15.452333 [5620/5620]: Cleaning up options (in 
> sessiond_cleanup_options() at main.c:773)
>
> DEBUG1 - 21:52:15.453308 [5620/5620]: lttng-runas terminated with 
> status code 0 (in run_as_destroy_worker() at runas.c:737)
>
> DEBUG1 - 21:52:15.453349 [5620/5620]: *** assert failed :-) *** ==> 
> Matthew, BEET driven development works! (in sessiond_cleanup_options() 
> at main.c:805)
>
> can anybody help me ?
>
> thanks very much.
>
> lichuanbao
>
> ShenZhen in China
>
>
>
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-- 
Jonathan R. Julien
Efficios