Yes, with that LD_PRELOAD sample able to run. root@/tmp/lttng-build-root/bin # ./lttng create app Session app created. Traces will be written in /root/lttng-traces/app-20131206-174935 root@/tmp/lttng-build-root/bin # dmesg root@/tmp/lttng-build-root/bin # ./lttng enable-event -u -a All UST events are enabled in channel channel0 root@/tmp/lttng-build-root/bin # ./lttng start Tracing started for session app root@/tmp/lttng-build-root/bin # cd .. root@/tmp/lttng-build-root # cd .. root@/tmp # LD_PRELOAD=/tmp/lttng-build-root/lib/liblttng-ust.so.0 ./sample root@/tmp # root@/tmp # root@/tmp # cd lttng-build-root/ root@/tmp/lttng-build-root # cd bin/ root@/tmp/lttng-build-root/bin # ./lttng stop Waiting for data availability Tracing stopped for session app root@/tmp/lttng-build-root/bin # dmesg root@/tmp/lttng-build-root/bin # ./lttng destroy Session app destroyed root@/tmp/lttng-build-root/bin # cd / root@/ # cd root/ root@~ # ls lttng-traces root@~ # cd lttng-traces/ root@~/lttng-traces # ls root@~/lttng-traces #< no traces are generated>
in ps -ef 28664 root 0:00 ./lttng-sessiond -vvv --consumerd64-path=/tmp/lttng-build-root/lib/lttng/libexec/lttng-consumerd 29027 root 0:00 lttng-consumerd --quiet -u --consumerd-cmd-sock /var/run/lttng/ustconsumerd64/command --consumerd-err-sock /var/run/lttng/ustconsumerd64/error Regards, GMK. -----Original Message----- From: Thibault, Daniel [mailto:daniel.thiba...@drdc-rddc.gc.ca] Sent: Friday, December 06, 2013 9:14 PM To: Manikandan Govindaswamy; Jérémie Galarneau Cc: lttng-dev@lists.lttng.org Subject: RE: [lttng-dev] No trace files are generated for UST > As I'm using the custom image on x86 machine, i've kept the lib in > /tmp/lttng-build-root/lib folder and this sample able to see the library as > well. > > And the same way I able to create the trace files for kernel but not for ust. > There were no dmesg as well. > > [...] > root@/tmp # ldd sample > linux-vdso.so.1 (0x00007fff2a135000) > libdl.so.2 => /lib64/libdl.so.2 (0x00007fe2cccb5000) > liblttng-ust.so.0 => /tmp/lttng-build-root/lib/liblttng-ust.so.0 > (0x00007fe2cca51000) > [...] Try running sample using: LD_PRELOAD=/tmp/lttng-build-root/lib/liblttng-ust.so.0 ./sample If the LD_PRELOAD succeeds, we will know at least that liblttng-ust is reachable by sample. The modules have nothing to do with UST: kernel and user-space tracing are essentially independent features. Daniel U. Thibault Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC) Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS) R & D pour la défense Canada - Valcartier (RDDC Valcartier) | Defence R&D Canada - Valcartier (DRDC Valcartier) 2459 route de la Bravoure Québec QC G3J 1X5 CANADA Vox : (418) 844-4000 x4245 Fax : (418) 844-4538 NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> Gouvernement du Canada | Government of Canada <http://www.valcartier.drdc-rddc.gc.ca/> _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
