Hi, I'm trying to get UST working for the first time on RHEL 6.4. I compiled and installed the following packages: userspace-rcu-0.7.6 lttng-ust-2.1.2 lttng-tools-2.0.5 babeltrace-1.1.0
When I ran the sample app in lttng-ust/examples I couldn't see any traces. # lttng create test_session Session test_session created. Traces will be written in /root/lttng-traces/test_session-20130526-071315 # lttng start Tracing started for session test_session # cd /usr/local/share/doc/lttng-ust/examples/gen-tp/ # make lttng-gen-tp -o sample_tracepoint.h sample_tracepoint.tp gcc -c -o sample.o sample.c lttng-gen-tp -o sample_tracepoint.c sample_tracepoint.tp lttng-gen-tp -o sample_tracepoint.o sample_tracepoint.tp gcc -o sample sample.o sample_tracepoint.o -ldl -llttng-ust rm sample_tracepoint.c # ./sample # lttng stop Tracing stopped for session test_session # lttng view Trace directory: /root/lttng-traces/test_session-20130526-071315 [error] Cannot open any trace for reading. [error] opening trace "/root/lttng-traces/test_session-20130526-071315" for reading. [error] none of the specified trace paths could be opened. # ls -l /root/lttng-traces/test_session-20130526-071315 total 0 What am I doing wrong? I attached the debug log from the lttng-sessiond. Thanks, Aryeh
# lttng-sessiond --verbose --no-kernel DEBUG3: Creating LTTng run directory: /var/run/lttng [in create_lttng_rundir() at main.c:4325] DEBUG1: Client socket path /var/run/lttng/client-lttng-sessiond [in main() at main.c:4617] DEBUG1: Application socket path /var/run/lttng/apps-lttng-sessiond [in main() at main.c:4618] DEBUG1: LTTng run directory path: /var/run/lttng [in main() at main.c:4619] DEBUG3: Created hashtable size 4 at 0x24ce0a0 of type 1 [in lttng_ht_new() at hashtable.c:96] DEBUG3: Created hashtable size 4 at 0x24ce340 of type 1 [in lttng_ht_new() at hashtable.c:96] DEBUG1: Signal handler set for SIGTERM, SIGPIPE and SIGINT [in set_signal_handler() at main.c:4459] Warning: No tracing group detected DEBUG1: epoll set max size is 363581 [in compat_epoll_set_max_size() at compat-epoll.c:224] DEBUG1: [thread] Manage application started [in thread_manage_apps() at main.c:1179] DEBUG1: Apps thread polling on 2 fds [in thread_manage_apps() at main.c:1200] DEBUG1: Thread manage kernel started [in thread_manage_kernel() at main.c:876] DEBUG1: Updating kernel poll set [in update_kernel_poll() at main.c:748] DEBUG1: Thread kernel polling on 2 fds [in thread_manage_kernel() at main.c:905] DEBUG1: [thread] Manage application registration started [in thread_registration_apps() at main.c:1392] DEBUG1: Notifying applications of session daemon state: 1 [in notify_ust_apps() at main.c:687] DEBUG1: Got the wait shm fd 17 [in get_wait_shm() at shm.c:117] DEBUG1: Futex wait update active 1 [in futex_wait_update() at futex.c:62] DEBUG1: Accepting application registration [in thread_registration_apps() at main.c:1423] DEBUG1: [thread] Dispatch UST command started [in thread_dispatch_ust_registration() at main.c:1324] DEBUG1: Futex n to 1 prepare done [in futex_nto1_prepare() at futex.c:73] DEBUG1: Woken up but nothing in the UST command queue [in thread_dispatch_ust_registration() at main.c:1334] DEBUG1: [thread] Manage client started [in thread_manage_clients() at main.c:3802] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() at main.c:3910] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Processing client command 8 [in process_client_msg() at main.c:3317] DEBUG3: mkdir() recursive /root/lttng-traces/test_session-20130526-071315 with mode 504 for uid 0 and gid 0 [in run_as_mkdir_recursive() at runas.c:339] DEBUG1: Using run_as_clone [in run_as() at runas.c:323] DEBUG1: Tracing session test_session created in /root/lttng-traces/test_session-20130526-071315 with ID 1 by UID 0 GID 0 [in session_create() at session.c:232] DEBUG1: Sending response (size: 16, retcode: Success) [in thread_manage_clients() at main.c:3944] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() at main.c:3910] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Processing client command 16 [in process_client_msg() at main.c:3317] DEBUG1: Getting session test_session by name [in process_client_msg() at main.c:3372] DEBUG1: Sending response (size: 16, retcode: Success) [in thread_manage_clients() at main.c:3944] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: UST registration received with pid:8433 ppid:25028 uid:0 gid:0 sock:18 name:sample (version 2.1) [in thread_registration_apps() at main.c:1510] DEBUG1: Futex n to 1 wake done [in futex_nto1_wake() at futex.c:100] DEBUG1: Accepting application registration [in thread_registration_apps() at main.c:1423] DEBUG1: Futex n to 1 wait done [in futex_nto1_wait() at futex.c:87] DEBUG1: Futex n to 1 prepare done [in futex_nto1_prepare() at futex.c:73] DEBUG1: Dispatching UST registration pid:8433 ppid:25028 uid:0 gid:0 sock:18 name:sample (version 2.1) [in thread_dispatch_ust_registration() at main.c:1346] DEBUG1: Woken up but nothing in the UST command queue [in thread_dispatch_ust_registration() at main.c:1334] DEBUG3: Created hashtable size 4 at 0x7fdd6c0009d0 of type 1 [in lttng_ht_new() at hashtable.c:96] DEBUG1: App registered with pid:8433 ppid:25028 uid:0 gid:0 sock:18 name:sample (version 2.1) [in ust_app_register() at ust-app.c:1365] DEBUG1: Apps with sock 18 added to poll set [in thread_manage_apps() at main.c:1280] DEBUG1: Apps thread polling on 3 fds [in thread_manage_apps() at main.c:1200] DEBUG1: PID 8433 unregistering with sock 18 [in ust_app_unregister() at ust-app.c:1395] DEBUG1: Apps thread polling on 2 fds [in thread_manage_apps() at main.c:1200] DEBUG3: Call RCU deleting app PID 8433 [in delete_ust_app_rcu() at ust-app.c:237] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() at main.c:3910] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Processing client command 17 [in process_client_msg() at main.c:3317] DEBUG1: Getting session test_session by name [in process_client_msg() at main.c:3372] DEBUG1: Sending response (size: 16, retcode: Success) [in thread_manage_clients() at main.c:3944] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Processing client command 13 [in process_client_msg() at main.c:3317] DEBUG1: Counting number of available session for UID 0 GID 0 [in lttng_sessions_count() at main.c:2057] DEBUG1: Getting all available session for UID 0 GID 0 [in list_lttng_sessions() at main.c:2084] DEBUG1: Sending response (size: 4388, retcode: Success) [in thread_manage_clients() at main.c:3944] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() at main.c:3910] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3871] DEBUG1: Receiving data from client ... [in thread_manage_clients() at main.c:3906] DEBUG1: Processing client command 9 [in process_client_msg() at main.c:3317] DEBUG1: Getting session test_session by name [in process_client_msg() at main.c:3372] DEBUG3: No kernel session when tearing down session [in teardown_kernel_session() at main.c:363] DEBUG3: No UST session when tearing down session [in teardown_ust_session() at main.c:390] DEBUG1: Destroying session test_session [in session_destroy() at session.c:151] DEBUG1: Sending response (size: 16, retcode: Success) [in thread_manage_clients() at main.c:3944] DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] DEBUG1: Accepting client command ... [in thread_manage_clients() at main.c:3834] DEBUG1: Updating kernel poll set [in update_kernel_poll() at main.c:748] DEBUG1: Thread kernel polling on 2 fds [in thread_manage_kernel() at main.c:905]
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