---------------------------------------------------------------------- Date: Wed, 12 Nov 2014 23:26:41 +0800 From: J Lin <[email protected]>
> I've recently ported LTTng to ARM and I can't seem to understand what is > going wrong with my results. I ran a typical session with "lttng enable-event > -k -a" for test. Here are the observations: > > 1. only "lttng_xxx (e.g, lttng_statedump_interrupts)" are recorded 2. > different sessions yield trace on different CPU (the system has 4) but not > for all 4, just 1 cpu 3. no recorded session span more than 1 second though I > would run sleep (i.e., 10s) between "start" and "stop" > > This leads me to believe LTTng might be dependent on something in the system > that isn't present. This is a customized kernel of a client. It has all > required configs. > > If there is a trigger mechanism after running "lttng start", what would it > be? It seems it grabs items initially then doesn't continue. I read in one of > the papers that LTTng is architecture dependent. Any help is appreciated. > > Mike How exactly did you "port" LTTng to ARM? As far as I know, you need only rebuild it there. Your symptoms lead me to believe you may have not installed the requisite lttng-modules. Did you test user-space tracing? 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) RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre 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 [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
